JP4661705B2 - Damping material for machine parts, manufacturing method thereof, and machine part using the same - Google Patents

Description

  The present invention relates to a material for processing parts used in automobiles, construction machines, industrial machines, and the like, and in particular, for machine parts that can greatly improve the vibration damping performance regardless of the material used. The present invention relates to a vibration damping material and a manufacturing method thereof.

  In automobiles, construction machines, industrial machines, etc., each part is driven by power generated by an engine, a motor, or the like. The parts used for them have various required characteristics such as surface pressure resistance and bending strength, and materials suitable for satisfying them are selected and used.

  And most of these materials are alloys such as Fe and Al, but there are drawbacks that are difficult to solve with the materials themselves. In other words, parts made of these alloys are easy to propagate the vibration generated in the environment of use, and there is a limit to the ability to attenuate the vibration with only that part, resulting in noise and lowering the quietness, vibration This may reduce the service life of the parts.

  For example, in recent automobiles, it is not possible to satisfy the strict requirements of users by simply having excellent engine performance, and a high level of quietness is required in the car while driving. I came. In the case of automobiles, gear noise is one major factor in noise generation. However, gears that cause noise generation are generally carburized, and there is an adverse effect on gear meshing due to the occurrence of heat treatment distortion. It has been found that this is the cause of noise generation. Therefore, while various technological developments aimed at reducing heat treatment strain have been actively conducted, development of a technique for blocking or reducing generated sound and vibration has been strongly desired.

  Taking this gear noise as an example, in order to prevent the occurrence, it is not unthinkable to perform a finishing process again after the carburizing process to eliminate the heat treatment distortion. However, a large cost is required for the finishing process. In addition, it is technically possible to provide a damper mechanism in the gear or the unit in which it is incorporated, but there is a cost limitation due to securing the space and increasing the number of parts. The current situation is that the adoption of measures is not progressing. Therefore, there has been a strong demand for the development of technology capable of ensuring quietness that can be satisfied by the user even if the produced gear is used with the distortion caused by carburization remaining.

  As the most direct improvement method for this problem, there is a method in which a part is manufactured with a damping material and vibration is absorbed by the part itself. However, as known damping materials, iron-based high alloys, pure Mg, Mg alloys, or Mn-Cu alloys are well known, but it goes without saying that they are all expensive. In addition, when used as a machine structural part, there is a problem that sufficient strength cannot be secured. Moreover, even if it is a composite steel plate with excellent vibration damping properties known in the steel plate field, there are restrictions on the shape of the steel plate when it comes to mechanical structural parts, especially power transmission parts, and the usable range is extremely small . Accordingly, there has been a strong demand for the development of a material capable of imparting excellent vibration damping properties regardless of the type of material without causing these problems.

  As a measure for improving the vibration damping performance without using a material having a special vibration damping property as described above, a method of conventionally introducing an interface such as a crack that is not intentionally metal-bonded into a component is good. For example, the techniques described in Patent Documents 1 and 2 are known.

  Among these, the technique described in Patent Document 1 forms a fragile layer (part) in the material, and then applies a thermal shock such as heating and quenching to intentionally generate cracks in the material, thereby suppressing vibration. It is intended to increase.

  Further, Patent Document 2 intends to form a linear bead portion at a required portion of a metal plate and enhance the vibration damping effect of the metal plate by cracks generated in the bead portion.

However, the above-described conventional invention has the following problems.
In order to form a brittle layer inside the material, the invention described in Patent Document 1 described above is intentionally carburized in low-carbon steel, or previously used high-carbon steel which is a brittle material, and rapidly cooled to it. It is characterized by giving a thermal shock.

  Therefore, if the technology of Patent Document 1 is used to improve the vibration damping performance of machine parts, carburization is required even when used for parts that do not require carburization due to strength, or high carbon steel is used. Therefore, materials that are easily cracked, such as high carbon steel, will be used for parts that are not suitable. There is a problem of end.

  In addition, as described in the specification, the invention described in Patent Document 2 uses quench hardening ability, uses a metal plate having high quench hardening ability and high cracking sensitivity, and generates cracks. A feature is that a bead portion is formed at a portion to be caused to be cracked. Therefore, this technique inevitably has its effect unless a metal plate with high quench hardening capability is used. In addition to restrictions on the shape of steel plates, the scope of application is greatly limited. There is a problem that it ends up.

  As an invention made for the purpose of solving the above-mentioned problems, there is a damping material for mechanical parts described in Patent Document 3 and a manufacturing method thereof. This vibration damping material for machine parts has few restrictions in terms of material, makes it easy to select a material according to demand, can be widely applied to many machine parts, and can obtain excellent damping characteristics.

JP-A-52-147510 JP 2000-35082 A International Publication No. WO 2006/025488 A1 Pamphlet

Patent Document 3 describes a technique for improving vibration damping properties by forming a non-bonded interface by forming a groove by press-fitting or forging and processing in a direction to reduce the space in the groove. However, the press-fitting method has some problems in terms of productivity, and there is a problem that the formation of the groove part is large in addition to the groove processing punch, and the productivity is good and the mold is not burdened easily. There has been a strong demand for the development of damping materials for machine parts that can be manufactured.
The present invention has been made in view of such a conventional problem, and there are few restrictions in terms of material, and it is easy to select a material according to demand, and it can be widely applied to many machine parts. An object of the present invention is to provide a vibration damping material for machine parts and a method for manufacturing the same, which can efficiently form a non-bonding interface for improving vibration characteristics.

  The first invention is formed by continuously performing a shearing process that forms a slide part that is partially shifted by applying a shear stress to the material and a fitting back process that returns the slide part to its original position. The vibration damping material for mechanical parts has a non-bonding interface that is in contact without being metallicly bonded (Claim 1).

  The present invention has a non-bonding interface intentionally provided by a specific procedure in which a non-bonding interface is formed by continuously performing a shearing process and a fitting back process. By providing such a non-bonding interface, a sufficiently large vibration damping improvement effect can be obtained. In addition, since the non-bonding interface can be generated by continuously performing shearing and fitting back processing, there is an advantage that a large vibration damping effect can be obtained in common as long as these materials can be processed. Compared with the inventions described in Patent Documents 1 and 2, the material limitation can be made much smaller. Moreover, the vibration damping material for mechanical parts can be manufactured more efficiently than the method described in Patent Document 3 by continuously performing the shearing process and the fitting back process.

  Further, since the non-bonding interface is generated by continuously performing the shearing process and the fitting back process, it is easy to set the position of the non-bonding interface to a position and shape convenient for the machine part. Therefore, by providing a non-bonded interface at a position where there is no problem in the strength of the part (= position where high stress is not applied), a material that can produce a mechanical part that has a non-bonded interface but does not have any problem in strength Can be obtained.

  Further, in order to ensure excellent vibration damping properties, it is necessary that the generated gap of the non-bonding interface is closed and is in contact without metal bonding. Note that the term “contact” as used herein includes the case where a non-contact portion exists partially or continuously when viewed microscopically, and when viewed with the naked eye without relying on a magnifying glass, it is apparently an interface. It includes all cases that appear to be in contact. In the present invention, as described above, the non-bonding interface in such a state can be easily obtained by continuously performing the shearing process and the fitting back process.

A second invention is a method of manufacturing a vibration damping material for mechanical parts having a non-bonding interface that is in contact without being metallically bonded,
A mechanical component comprising: a forging process in which a shearing process for applying a shearing stress to a material to form a partially displaced slide part and a fitting back process for returning the slide part to its original position are continuously performed. The present invention relates to a method for manufacturing a vibration damping material (claim 11).
According to this manufacturing method, the above-described excellent vibration damping material for machine parts can be reliably manufactured.

According to a third aspect of the present invention, there is provided a mechanical component produced by processing the vibration damping material for a mechanical component according to the first aspect of the invention (claim 14).
Machine parts made by using the excellent vibration damping material for mechanical parts of the first invention as a raw material, for example, gears having teeth formed on the vibration damping material for mechanical parts are very excellent. It exhibits useful vibration damping characteristics and is useful.

Hereinafter, the contents of the invention will be described in detail.
The vibration damping material for a machine part according to the first aspect of the present invention is formed by continuously performing the shearing process and the fitting back process, and is substantially non-contact with the entire surface without being metallicly bonded. Has a bonding interface.

  In the shearing process, a shearing stress is applied to the material to form a partially displaced slide part. Further, the fitting back process returns the slide part to the original position. Selection of these processing methods can be performed in accordance with the material, and can be performed cold, or heated and heated. However, when the scale is sandwiched between the non-bonded interface, excellent vibration damping can be obtained and it is possible to handle larger parts. More preferably.

The shearing process is performed by, for example, shearing and deforming the material using a pair of dies and punches. Therefore, it is possible to control the formation of the non-bonding interface only by managing the slide.
Further, in the examples described later, only an example in which all the parts on the inner diameter side are slid downward is shown, but in the case of the present invention, if the non-bonding interface can be formed, the purpose can be achieved. It doesn't matter. Therefore, the same effect can be obtained even when the inner diameter side component is slid upward.
In addition, the shearing process includes a case where the slide part is not completely separated from the surrounding part and a case where the slide part is completely separated. Hereinafter, the former is referred to as half-shear processing and the latter is referred to as full-shear processing.

  After performing the shearing process, add the process so that the slide part is returned to the original position by fitting back, and finally process until the entire surface is almost in contact with the formed interface. The molding of the non-bonding interface is completed. The contact on the interface mentioned here is just an appearance, and it is not necessary whether the entire surface is strictly in contact. Therefore, even if there is a partial or continuous non-contact part as a result of microscopic observation, it does not fall out of the scope of the present invention for that reason and appears to be almost in contact with the naked eye It is enough if it has been processed. By processing to such a state, the vibration damping property can be greatly improved.

  Machine parts are often manufactured by forging because of their excellent productivity. Therefore, when the present invention is applied to parts that have been manufactured by forging, the conventional forging process is designed to be a process that can continuously perform the shearing process and the fitting back process. By correcting, it is possible to manufacture a machine part having a non-bonding interface with little influence on productivity.

As the forging process, basically, a material heating process, a crushing process, a rough ground process, a finishing process, and a punching process are performed in this order to obtain a final shape.
In the present invention, the shearing process and the fitting back process can be continuously performed in any one of the crushing process, the rough ground process, the finishing process, and the punching process. Therefore, it can manufacture, without reducing productivity significantly.

In the vibration damping material for mechanical parts of the present invention, it is preferable that the shearing process is a half-shear process in which the slide part is shifted so as not to be detached from a part around the material.
In this case, it is possible to obtain a vibration damping material for a machine part having a non-bonding interface penetrating both surfaces or a non-penetrating non-bonding interface by adjusting the degree of sliding.
Moreover, since it can be easily fitted back, a product excellent in dimensional accuracy and stability can be easily obtained.

Moreover, when the said half shear process is employ | adopted, the said nonbonding interface can be set as the structure which is independently formed in both surface sides along the said shear stress provision direction, respectively, and does not penetrate (claim). Item 3).
In this case, by changing the slide length, the length of the finally generated non-bonding interface can be adjusted. Moreover, it can be set as the state which had the connection part by which the said sliding site | part and the site | part of the circumference | surroundings are not cut away.

  Further, since the effect of improving vibration damping is affected in proportion to the size of the non-bonded interface to be generated, it is necessary to generate a large non-bonded interface to some extent. That is, the larger the area of the non-bonding interface, the greater the effect of damping the vibration. Specifically, it is preferable that the total depth of the non-bonding interfaces formed on the surface sides of both ends is 20% or more of the thickness dimension in the same direction. When the total depth is less than 20%, the vibration damping effect may not be sufficiently obtained. There is no particular upper limit. In order to obtain a sufficient vibration damping effect, it is desirable that the total depth of the non-bonded interface be 50% or more of the thickness dimension in the same direction.

Further, even when the half shear processing is employed, the non-bonding interface may be formed so as to penetrate both surfaces along the direction in which the shear stress is applied (Claim 5).
If the degree of sliding of the shearing process is increased by using the half-shearing process as the shearing process, a vibration damping material for machine parts having a non-bonding interface penetrating both surfaces along the shearing stress applying direction is obtained. Can be manufactured.

Further, the shearing process may be a full shear process in which the slide part is shifted so that it completely separates from the part around the material. That is, applying shear stress to the material and shifting the part of the material so as to completely disengage from the surrounding part, shearing process to form a slide part by full shear process, and fitting back process to return the slide part to its original position preparative formed by continuously be carried out, there is a metal binding machine parts for vibration damping material and having a non-binding interface in contact without (claim 4).
In this case, a vibration damping material for machine parts having a non-bonding interface formed so as to penetrate both surfaces can be obtained.

That is, the non-bonding interface is in a state of being formed so as to penetrate both surfaces along the shearing stress applying direction (claim 5).
Even in this case, there is no problem even if the driving force is transmitted if the non-bonding interface is not a perfect circle or a polygon. Moreover, it is also possible to fix the non-bonded interface portion on the surface of the vibration damping material for machine parts by welding from the outside.

The vibration damping material for mechanical parts is a gear damping material for forming a gear having damping characteristics, and is provided on a ring-shaped or disk-shaped main body portion and an outer peripheral side surface or an inner peripheral side surface thereof. It has a tooth | gear type | mold formation part, It is preferable that the said non-bonding interface is formed in the axial direction of the said main-body part (Claim 6).
In this case, when the mechanical component damping material is used as a gear damping material for forming a gear having damping characteristics, the effect can be further improved significantly.

  A gear is a part that plays the role of transmitting the power of an engine or the like by meshing teeth with each other, but stress is not uniformly applied to the entire gear part, and the driving force is concentrated on the tooth part. Therefore, a large force may be applied to a region other than the tooth portion on the outer periphery or the inner periphery in a position away from the tooth portion, that is, for example, a gear whose teeth are processed on the outer periphery or the inner periphery. Absent. Depending on the case, a through hole may be partially formed for weight reduction. Therefore, the present inventors pay attention to the stress load state in such a gear, and form a non-bonding interface at a position away from the tooth processing region by an appropriate length. In the same way as above, a fatigue test with a driving force applied was performed. As a result, when the driving force to be applied was increased, it was understood that the strength limit of the gear occurred due to the destruction of the tooth portion, not the destruction from the non-bonding interface, and the effectiveness of the present invention was confirmed. Is.

The gears are often subjected to surface hardening treatment such as carburizing when it is necessary to obtain high strength, but the present invention has excellent vibration damping properties regardless of the presence or absence of such surface hardening treatment. Can be obtained.
Therefore, by manufacturing the gear using the vibration damping material for machine parts of the present invention, it is possible to easily manufacture a gear that is remarkably excellent in vibration damping.

In the present invention, since the non-bonding interface is characterized by being continuously formed by using a mold set in a forging press, the non-bonding interface can be selected from a variety of shapes. Can do. For example, it may be an annular shape or a regular polygon, and either a symmetric shape or an asymmetric shape may be used (claims 7 to 10).
In the case of an asymmetric shape, there are an irregular polygon, an irregular waveform, and various other shapes. In this case, it can be expected to further improve the vibration damping effect.

In the method of manufacturing a vibration damping material for mechanical parts according to the second aspect of the invention, the shearing is performed by half-shear processing in which the slide part is shifted so as not to be detached from the part around the material, and the slide part is around the material. Any one of the full shearing processes for shifting completely so as to leave the part can be selected (claims 12 and 13). That is, when full shear processing is selected, a method of manufacturing a vibration damping material for a machine part having a non-bonding interface that is in contact without being metallically bonded, and applying shear stress to the material, It has a shear processing for forming the slide site by Furushea processing shifting to completely detached from the site of the surrounding its part, continuously performing forging step processing and return fitting returning the slide portion to the original position It becomes the manufacturing method of the damping material for machine parts characterized by this.
And by adjusting the slide length, the area of the non-bonding interface can be adjusted freely. When the amount of displacement is relatively large even in half shear processing, or in full shear processing, it is formed through both surfaces. It is possible to obtain a vibration damping material for mechanical parts having a non-bonded interface.

Example 1
Next, the Example concerning the damping material for machine parts of this invention is described using FIG.1 and FIG.2.
As shown in FIGS. 1 and 2, the vibration damping material 1 for a machine part of the present example includes a shearing process that forms a slide part 21 that is partially shifted by applying shear stress to the material 2, and the slide part 21 is It has the non-bonding interface 22 which is formed by continuously performing the fitting back process for returning to the original position and is in contact without being metallicly bonded.

  The steel used as the material 2 is SCR420H, and its chemical composition is 0.21% C-0.28% Si-0.83% Mn-1.10% Cr-0.028Al-0.011% N. It is steel.

Specifically, in the manufacturing method of the vibration damping material 1 for mechanical parts, first, the steel was heated and subjected to a crushing process to obtain the material 2. Then, the shearing process and the fitting back process were continuously performed in the rough ground process, and the damping material 1 for machine parts was produced. In this example, after that, finishing processing was further performed in which a bottomed hole was machined in the center, and finally a part having a final shape was obtained by punching. As described above, the formation of the non-bonding interface is not limited to the finishing process, and can be performed at any step in the middle.
Hereinafter, the shearing process and the fitting back process corresponding to the present invention will be further described.

As the shearing process, as shown in FIG. 1 (b), the slide length d is adjusted by applying a shearing stress in the B direction shown in FIG. Half-shear processing was performed by shifting so as not to leave the region 23 around.
Next, as the fitting back process, as shown in FIG. 1 (c), after the shearing process, the process was further performed in such a direction that the slide part 21 returns to the original state by further hot forging without cooling. As a result, in terms of appearance, the inner diameter side of the portion 23 around the material and the outer diameter side of the slide portion 21 formed in the shearing process were in contact with each other.

Moreover, the state seen from the A direction in FIG.1 (c) is shown in FIG. As shown in the figure, the non-bonding interface 22 was formed in a circular shape at a distance L from the center O of the material.
FIG. 1C is a cross-sectional view of the vibration damping material 1 for machine parts. As shown in the drawing, the non-bonding interface 22 is formed through both surfaces along the shear stress applying direction B. ing.

In addition, when the non-bonding interface 22 penetrates, depending on the application, there may be a problem in use as a component. In this case, when the slide part 21 is fitted back, as shown in FIG. 1 (d), a method of further deforming the non-bonding interface 22 by applying some compression deformation in the D direction, On the surface of the vibration damping material 1, it is possible to prevent the slide portion 21 from easily separating by a method such as welding a part of the non-bonding interface 22 from the outside. In addition, by processing hot, the scale is sandwiched on the non-bonding interface 22, but the presence of this scale also improves the vibration damping property, so that the scale does not come off during use. In order to achieve this, it is effective to weld the non-bonding interface 22 part from the outside. In these respects, the same applies to the embodiments described later.
Further, the slide part 21 can be more reliably prevented from being detached by further deformation in the direction of the center on the outer diameter side of the vibration damping material for machine parts.

(Example 2)
This example is an example in which the same steel as in Example 1 is used and the degree of sliding in the half shear process in Example 1 is suppressed. Other steps were performed in the same manner as in Example 1.
FIG. 3 shows a cross-sectional view of the vibration damping material 102 for machine parts produced in this example. From this figure, the non-bonding interface 22 of the vibration damping material 102 for mechanical parts of this example is formed along the shear stress applying direction B, with the connecting portions 24 being sandwiched independently on both surface sides, and penetrates. I understand that it is not.

(Example 3)
This example is an example in which the same steel as in Example 1 is used and half-shear processing in Example 1 is changed to full-shear processing. Other steps are the same as those in the first embodiment. The manufacturing process of the vibration damping material 103 for machine parts of this example is shown in FIG.
As shown in FIG. 4B, the full shear processing was performed so that the slide portion 21 was completely detached from the portion 23 around the material 2.

  As a result, in terms of appearance, the inner diameter side of the portion 23 around the material and the outer diameter side of the slide portion 21 formed in the shearing process were in contact with each other. FIG. 4C shows a cross section of the vibration damping material 103 for machine parts produced in this way. As is known from the figure, the non-bonding interface 22 of the vibration damping material 103 for machine parts is formed so as to penetrate both surfaces along the shear stress applying direction B.

Example 4
In this example, as shown in FIGS. 6 and 7, the present invention is applied to the spur gear 4. First, FIG. 5 shows a basic method of manufacturing a conventional spur gear.
As shown in FIG. 5, a conventional spur gear manufacturing process includes a material heating step (a) for heating the massive steel 25, a crushing step (b) for crushing the heated steel 25, and a material 2 for finishing forging. A roughing step (c) having a shape of the above, a finishing step (d) in which the material 2 is processed into a rough-shaped intermediate body 26, and a central portion 27 of the rough-shaped intermediate body 26 being removed. Step (e) is performed in order. When this manufacturing process is performed, a conventional spur gear 9 having no non-bonding interface shown in FIG. 5F is obtained.

  This conventional spur gear 9 has an inner cylinder portion 48 having a shaft hole 49 in the center, a ring-shaped thin portion 45 provided on the outer peripheral side thereof, and teeth formed outwardly on the outer peripheral side thereof. A tooth mold forming portion 41 having a tooth mold forming area is provided.

  Next, a manufacturing method to which the present invention is applied will be described. As shown in FIGS. 6A to 6C, the same process as the conventional process shown in FIG. 5 is performed from the material heating process (a) to the rough ground process (c). And, as shown in FIG. 6 (d1) and FIG. 6 (d2), the remarkable point is that the finishing process (FIG. 5 (d)) in the conventional manufacturing process is continuously subjected to the shearing process and the fitting back process. It is a point that was incorporated into. Other processes are the same as the conventional manufacturing process. The same steel as in Example 1 was used.

As the shearing process, as shown in FIG. 6 (d1), a shear stress is applied in the B direction to a thin portion 45 to be described later, and the slide portion 21 formed of a part of the inner cylindrical portion 48 and the thin portion 45 is moved to the teeth. Half-shear processing was performed by shifting the mold forming portion 41 and the thin portion 45 within a range that does not leave the surrounding portion 23. Thereafter, the non-bonding interface 22 penetrating through both surfaces could be formed along the shear stress applying direction by continuously performing the fitting back process (FIG. 6 (d2)).
FIG. 7 is a view of the spur gear 4 viewed from the direction C in FIG. The spur gear 4 has the same dimensions and shape as the conventional spur gear 9 except that the non-bonding interface 22 is provided in the thin portion 45 that connects the inner cylinder portion 48 and the tooth shape forming portion 41. It is a feature. A region S indicates a tooth mold forming region.

  As described above, in this example, the forging process called the finishing process (d) in the conventional manufacturing process has been redesigned into a process capable of continuously performing the shearing process and the fitting back process. Therefore, as a final shape, as shown in FIG. 6 (f) and FIG. 7, a ring shape having an inner cylinder portion 48 provided with a shaft hole 49 in the center and a non-bonding interface 22 in the axial direction on the outer peripheral side thereof. The spur gear 4 provided with a tooth-forming part 41 having a tooth-forming part S having teeth formed outwardly on the outer peripheral side of the thin-walled part 45 is more productive than the conventional method. It was possible to easily form the film with almost no decrease.

(Example 5)
In this example, as shown in FIG. 8, the half shear processing (FIG. 6 (d <b> 1)) in Example 4 is applied with shear stress in the B direction with respect to the thin part 45 described later, and the inner cylinder part 48 and the thin part 45. This is an example in which the slide part 21 made of a part of the above is changed to a full shear process in which the slide part 21 is shifted so as to be completely detached from the surrounding part 23 made of a part of the tooth mold forming part 41 and the thin part 45. Other steps are the same as those in Example 4.
The final shape obtained in this example is exactly the same as in Example 4.

(Example 6)
This embodiment is another embodiment in which the present invention is applied to the spur gear 6 as shown in FIG.
A manufacturing method to which the present invention is applied will be described. As shown in FIGS. 9A to 9D, the same process as the conventional process shown in FIG. 5 is performed from the material heating process (a) to the finishing process (d). And, as shown in FIG. 9 (e1) and FIG. 9 (e2), it should be noted that the shearing process and the fitting back process are continuously performed in the above-described conventional manufacturing process (FIG. 5 (e)). It is a point that was incorporated into. Other processes are the same as the conventional manufacturing process. The same steel as in Example 1 was used.

As shown in FIG. 9 (e1), the shearing process is performed by applying a shearing stress in the B direction to the thin portion 45 described later, so that the slide portion 21 composed of the inner cylinder portion 48 and a part of the thin portion 45 is moved to the teeth. Half-shear processing was performed to shift the mold forming portion 41 and the thin portion 45 so as not to leave the peripheral portion 23. After that, the back fitting process (FIG. 9 (e2)) was continuously performed, and the non-bonding interface 22 penetrating both surfaces along the shear stress applying direction could be formed.
The spur gear 6 shown in FIG. 9 (f) has the same dimensions and shape as the conventional spur gear 9, but the thin-walled portion 45 that connects the inner cylinder portion 48 and the tooth shape forming portion 41 is not coupled to the spur gear 6. A feature is that an interface 22 is provided.

  As described above, in this example, the forging process called the punching process (e) in the conventional manufacturing process has been redesigned into a process capable of continuously performing the shearing process and the fitting back process. Therefore, as a final shape, as shown in FIG. 9 (f), a ring-shaped thin portion having an inner cylindrical portion 48 provided with a shaft hole 49 in the center and having an unbonded interface 22 in the axial direction on the outer peripheral side thereof. 45, and the spur gear 6 provided with the tooth-forming part 41 having the tooth-forming region where the teeth are formed outwardly on the outer peripheral side thereof can be easily formed with almost no change in productivity. I was able to.

(Example 7)
In this example, as shown in FIG. 10, the half shear processing (FIG. 9 (e <b> 1)) in Example 6 is subjected to shear stress in the B direction with respect to the thin part 45 described later, and the inner cylinder part 48 and the thin part 45. This is an example in which the slide part 21 made of a part of the above is changed to a full shear process in which the slide part 21 is shifted so as to be completely detached from the surrounding part 23 made of a part of the tooth mold forming part 41 and the thin part 45. The other steps are the same as in Example 6.
The final shape obtained in this example is exactly the same as in Example 6.

(Example 8)
In this example, the present invention is applied to the spur gear 8 as shown in FIG.
A manufacturing method to which the present invention is applied will be described. As shown in FIGS. 11A and 11B, the material heating step (a) crushing step (b) is performed in the same manner as in the prior art shown in FIG. And, as shown in FIG. 11 (c1) and FIG. 11 (c2), the remarkable point is that the roughing process (FIG. 5 (c)) in the conventional manufacturing process is followed by the shearing process and the fitting back process. It is a point that was incorporated. Other processes are the same as the conventional manufacturing process. The same steel as in Example 1 was used.

As the shearing step, as shown in FIG. 11 (c1), a shear stress is applied in a B direction to a portion to be a thin portion 45 described later so that the slide portion 21 in the portion is not detached from the surrounding portion 23. We performed half-sharing processing. Thereafter, the back-fitting process (FIG. 11 (c2)) was continuously performed, and the non-bonding interface 22 penetrating both surfaces along the shearing stress application direction could be formed.
The spur gear 8 shown in FIG. 11 (f), which is the final shape, has the same dimensions and shape as the conventional spur gear 9, but has a thin portion 45 that connects the inner cylinder portion 48 and the tooth shape forming portion 41. In addition, the non-bonding interface 22 is provided.

  As described above, in this example, the rough ground process (c) in the conventional manufacturing process was redesigned into a process capable of continuously performing the shearing process and the fitting back process. Therefore, as a final shape, as shown in FIG. 11 (f), a ring-shaped thin portion having an inner cylindrical portion 48 provided with a shaft hole 49 in the center and having an unbonded interface 22 in the axial direction on the outer peripheral side thereof. 45, and the spur gear 8 provided with the tooth pattern forming portion 41 having the tooth pattern forming region formed outwardly on the outer peripheral side thereof is easily formed without substantially changing the productivity. I was able to.

Example 9
In this example, as shown in FIG. 12, the half-shear processing (FIG. 11 (c1)) of Example 8 is subjected to shear stress in the B direction with respect to a portion that becomes a thin-walled portion 45 described later, and the sliding portion inside thereof. This is an example in which 21 is changed to a full-shear process in which it is shifted so as to completely disengage from the surrounding part 23. Other steps are the same as those in Example 8.
The final shape obtained in this example is exactly the same as in Example 8.

(Example 10)
In this example, a finishing process and a punching process are further performed on the mechanical component damping material 1 manufactured in Example 1 and the mechanical component damping material 102 manufactured in Example 2. Table 1 and FIG. As shown, three types of spur gears 5 (Sample E1 to Sample E3) were produced. Further, as shown in the figure, the spur gear 5 has a shaft hole portion 59 and has a constant thickness up to the outer peripheral tooth mold forming region S. The tip diameter g was 84 mm, the tooth width h was 12 mm, the module was 2, and the number of teeth was 40.

  Further, as shown in Table 1, Samples E1 to E3 as examples of the present invention employ those having a non-bonding interface 22, and the non-bonding interface diameter D is 63.5 mm. Moreover, the depth of the non-bonding interface 22 was controlled by adjusting the degree of sliding in the above-described half shear processing, and was set in the range of 3.28 to 12 mm. Moreover, in order to make it possible to clearly compare the difference from the conventional product, as a comparative example (sample C1), as a comparative example (sample C2), a material that does not have a non-bonding interface made of the same component steel. FCD500, which is one of spheroidal graphite cast irons that have been conventionally said to have excellent vibration damping properties compared to steel, was also processed to the same dimensions as the spur gear 5.

Further, in actual gears, carburizing is often performed in order to satisfy the required strength, and it is necessary to accurately grasp the influence of the processing. Accordingly, vibration suppression evaluation before and after the carburizing treatment was performed on these spur gears 5 (sample E1 to sample E3) and samples C1 and C2.
The carburizing treatment was performed under the conditions of carburizing treatment conditions of 950 ° C. × 3 hours.

  In the vibration damping evaluation, the position of S1 shown in FIG. 14 is vibrated with a hammer while the sample is suspended on two wires, and the vibration of the end face of the diagonal tooth generated by the vibration is laser-induced. The measurement was performed using a displacement meter. Then, the logarithmic damping rate was calculated from the obtained vibration waveform, and the improvement level of the damping performance was evaluated based on the calculated value. The results are shown in Table 2. In addition, the numerical value shown in Table 2 displays the logarithmic attenuation rate before carburizing treatment of each gear specimen when the logarithmic attenuation rate before carburizing treatment of the sample C1 as a comparative example is set to 1. .

  As is apparent from Table 2, the examples (sample E1 to sample E3) in which the non-bonding interface was introduced into the material by continuously using the shearing process and the fitting back process as in this example are the non-bonding interface. It can be seen that the logarithmic decay rate is higher than that of the comparative examples (sample C1 and sample C2) that do not have any, and the vibration damping performance is greatly improved by the generation of the non-bonding interface. In particular, the examples (sample E2, sample E3) in which the ratio of the non-bonding interface to the total thickness was 61.9% and 100% had a remarkably high logarithmic decay rate, and an extremely high effect could be confirmed. In particular, it can be seen that as the depth of the non-bonding interface is increased and the area of the non-bonding interface is increased, the vibration damping property is improved.

  Further, as is apparent from Table 2, it can be seen that the effect of forming the non-bonding interface according to the present invention can provide a great vibration damping improvement effect regardless of the presence or absence of carburization. Although the cause is not clear, judging from the obtained results, the sample C1 and the sample C2 having no unbonded interface are provided with a nonbonded interface even though there is no difference in vibration damping before and after carburizing. For the samples E1 to E3, a considerable difference was observed.

  In addition, the sample used in this example was the one that was half-sheared as the shearing process, but even if the full shearing process was performed as the shearing process, the same results as the sample E3 that is an example of the present invention were obtained. Confirmed that it can be obtained.

In Examples 1 to 10, the shape of the non-bonding interface 22 was all circular to facilitate the experiment. However, in the present invention, the non-bonded interface is not limited to a circular shape as long as the vibration damping property is improved, and other shapes can of course be used.
For example, as shown in FIGS. 15 and 16, when a disk-shaped member 7 as a vibration damping material for machine parts or a machine part is assumed, regular non-bonding interfaces 71 and 72 can be formed. Further, as shown in FIGS. 17 and 18, non-bonding interfaces 73 and 74 having a polygonal shape of unequal sides which are asymmetric may be used. Examples of other non-bonding interface shapes are shown in FIGS. FIG. 19 shows an example in which a non-bonding interface 75 is provided in the form of a square spline. FIG. 20 shows an example in which a non-bonding interface 76 is provided in an involute spline shape. FIG. 21 shows an example in which a non-bonding interface 77 is provided in a serrated shape.

As shown in FIGS. 17 and 18, when non-equal polygonal non-bonding interfaces 73 and 74 are employed, the vibration damping property is improved as compared with the case of the equilateral polygon for the following reason. it is conceivable that.
That is, when teeth are formed at equal intervals on the inner diameter side or outer diameter side as in a gear, the meshing of the gear pair has a specific frequency according to the rotation frequency and the number of teeth. Similarly, torque is generated at a specific frequency. In the case of an equilateral polygonal non-bonded interface, the vibration damping effect can be reduced because the non-bonded interface receives the torque and vibration periodically transmitted from the meshing tooth surface at a cycle corresponding to the number of angles. There is sex. On the other hand, if the interface is an unequal side, the vibration-damping interface has an indefinite period, so that the vibration suppression effect can be further improved in an actual gear driving environment.

Explanatory drawing which shows the manufacturing method of the damping material for machine parts in Example 1. FIG. Explanatory drawing which shows the damping material for machine parts in Example 1. FIG. Explanatory drawing which shows the state after non-bonding interface shaping | molding in Example 2. FIG. Explanatory drawing which shows the manufacturing method of the damping material for machine parts in Example 3. FIG. Explanatory drawing which shows the manufacturing method of the conventional spur gear. Explanatory drawing which shows the manufacturing method of the spur gear in Example 4. FIG. Explanatory drawing which shows the spur gear in Example 4. FIG. Explanatory drawing which shows full-shear processing in Example 5. FIG. Explanatory drawing which shows the manufacturing method of the spur gear in Example 6. FIG. Explanatory drawing which shows full-shear processing in Example 7. FIG. Explanatory drawing which shows the manufacturing method of the spur gear in Example 8. FIG. Explanatory drawing which shows full-shear processing in Example 9. FIG. Explanatory drawing which shows the spur gear in Example 10. FIG. Explanatory drawing which shows the vibration position at the time of vibration suppression evaluation of a spur gear in Example 10. FIG. Explanatory drawing which shows an example of the shape of a non-bonding interface. Explanatory drawing which shows an example of the shape of a non-bonding interface. Explanatory drawing which shows an example of the shape of a non-bonding interface. Explanatory drawing which shows an example of the shape of a non-bonding interface. Explanatory drawing which shows an example of the shape of a non-bonding interface. Explanatory drawing which shows an example of the shape of a non-bonding interface. Explanatory drawing which shows an example of the shape of a non-bonding interface.

Explanation of symbols

1 Damping material for machine parts 2 Material 21 Slide part 22 Non-bonding interface

Claims (14)

  Metallic bonding formed by continuously performing a shearing process in which a shearing stress is applied to the material to form a partially displaced slide part and a fitting back process in which the slide part is returned to its original position. A vibration damping material for mechanical parts, characterized by having a non-bonding interface that is in contact with each other.   2. The vibration damping material for a machine part according to claim 1, wherein the shearing process is a half-shear process in which the slide part is shifted so as not to be detached from a part around the material.   3. The vibration damping material for a machine part according to claim 2, wherein the non-bonding interface is independently formed on both surface sides along the shear stress applying direction and does not penetrate. By applying a shearing stress to the material, the shearing to form a slide portion by Furushea processing shifting to completely leave a portion of the material from the site of the surrounding its, and processing returns fitted returning the slide portion to the original position A vibration damping material for a machine part, characterized by having a non-bonding interface formed by continuously performing contact without contacting metallically .   5. The vibration damping material for a machine part according to claim 2, wherein the non-bonding interface is formed so as to penetrate both surfaces along the shear stress applying direction.   In any one of Claims 1-5, the said damping material for machine parts is a damping material for gears for forming a gear which has a damping characteristic, and a ring-shaped or disk-shaped main-body part, A vibration damping material for machine parts, comprising a tooth mold forming portion provided on an outer peripheral side surface or an inner peripheral side surface, wherein the non-bonding interface is formed in an axial direction of the main body portion.   The vibration damping material for a machine part according to any one of claims 1 to 6, wherein the non-bonding interface is formed in an annular shape.   8. The vibration damping material for a machine part according to claim 7, wherein the non-bonding interface is formed in a symmetrical shape.   8. The vibration damping material for machine parts according to claim 7, wherein the non-bonding interface is formed in a circular shape.   8. The vibration damping material for a machine part according to claim 7, wherein the non-bonding interface is formed in an asymmetric shape. A method of manufacturing a damping material for a machine part having a non-bonding interface that is in contact without being metallically bonded,
A mechanical component comprising: a forging process in which a shearing process for applying a shearing stress to a material to form a partially displaced slide part and a fitting back process for returning the slide part to its original position are continuously performed. Manufacturing method for vibration control materials.   12. The method of manufacturing a damping material for a machine part according to claim 11, wherein the shearing process is a half-shear process in which the slide part is shifted so as not to be detached from a part around the material. A method of manufacturing a damping material for a machine part having a non-bonding interface that is in contact without being metallically bonded,
By applying a shearing stress to the material, the shearing to form a slide portion by Furushea processing shifting to completely leave a portion of the material from the site of the surrounding its, and processing returns fitted returning the slide portion to the original position The manufacturing method of the damping material for machine parts characterized by having the forging process which performs continuously.   A machine part produced by processing the vibration damping material for a machine part according to any one of claims 1 to 10.

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