KR102202444B1 - forming die for powder merallurgy - Google Patents

Abstract

The present invention relates to a powder metallurgy formation apparatus capable of preventing damage to a gear part of a gear component by enabling the gear component discharged after the formation of powder metallurgy to automatically switch directions. More specifically, a powder metallurgy insertion hopper (106) inserting a powder metallurgy material into a formation part (102) while moving forward and backward in an upper part of a formation die (101) including the formation part (102) is provided; a discharge plate (107) discharging a completely formed product is provided in front of the formation die; in the bottom of the formation die, a discharge means (103) discharging the formed product from the formation part (102) when an upper mold (108) ascends after forming the product by descending is provided on a base (104); in the bottom of the base, a lifting cylinder (105) lifting the formation die (101) is provided; a direction switching means (A) for switching directions of the formed product is provided in the powder metallurgy insertion hopper (106) and the discharge plate (107); a direction switch guide (111), which is provided at the front end of the discharge plate (107), has a direction switching groove (112) into which a second gear part (12) of the formed product (10) is diagonally inserted to induce a direction switch; a lower direction switching pushrod (116), which is provided in the powder metallurgy insertion hopper (106), is provided in the bottom to push the second gear part (12) of the formed product (10); and a direction switching pushrod (113) including a pushrod (115) moved forward and backward in accordance with the operation of a piston (114) to push a first gear part (11) of the formed product (10) is provided in the top of the lower direction switching pushrod (116).

Description

Powder metallurgy molding equipment {forming die for powder merallurgy}

The present invention relates to a powder metallurgy molding apparatus for preventing the gear part of the gear part from being damaged by automatically changing the direction of the gear part discharged after the powder metallurgy molding.

In general, powder metallurgy technology is a sintering that promotes bonding (solidification) between particles by pressing (compressing) metal powder to form a green compact with a predetermined shape, and then heating the green compact to a temperature near the melting point of the metal powder. It is a set of techniques that perform processing.

This makes it possible to manufacture a machine part having a complex shape and a high-precision dimension at low cost.

With the request for further miniaturization and weight reduction of mechanical parts, improvement of the mechanical strength of the green compact is required.

On the other hand, it is known that the magnetic properties deteriorate when the green compact is exposed to a high temperature atmosphere. For this reason, in the actual production of, for example, a magnetic core green compact, a subsequent high-temperature treatment (sintering treatment) may be omitted. In other words, a method that can increase the mechanical strength without high-temperature treatment (sintering treatment) is being sought.

Here, the mechanical strength is set to increase significantly (hyperbolic) as the density of the green compact is increased.

As a representative method of densification, a method of pressure molding while aiming to reduce the frictional resistance by mixing a lubricant with metal powder has been proposed (for example, Japanese Unexamined Patent Publication No. Hei 1-219101 (Patent Document 1)). In general, a mixed powder obtained by mixing about 1% by weight (1% by weight) of a lubricant with a basic metal powder is press-molded. Numerous proposals have been made toward higher density. These proposals are broadly divided into improvements in the lubricant itself and in the process related to pressure molding and sintering.

As the former, a proposal for a lubricant to be a carbon molecular composite obtained by combining ball-shaped carbon molecules and plate-shaped carbon molecules (Japanese Unexamined Patent Publication No. 2009-280908 (Patent Document 2)), penetration at 25°C. A proposal to use a lubricant of 0.3 to 10 mm (Japanese Unexamined Patent Publication No. 2010-37632 (Patent Document 3)) is mentioned. All are thought to reduce the frictional resistance between metal powder and metal powder and mold.

Among the latter, the warm molding and sintering powder metallurgy method (Japanese Unexamined Patent Publication No. Hei 2-156002 (Patent Document 4)), and easy handling pre-warmed powder metallurgy method (Japanese Patent Laid-Open No. 2000-87104 (Patent Document) 5)), 2 times press-2 times sintering powder metallurgy method (Japanese Unexamined Patent Application Publication No. Hei 4-231404 (Patent Document 6)) and once molding-sintered powder metallurgy method (Japanese Patent Application No. 2001-181701 (patent Document 7)) is known.

The first warm forming and sintering powder metallurgy method dissolves part (or all) of the lubricant by preheating a metal powder mixed with a solid lubricant and a liquid lubricant, and also disperses the lubricant among the particles.

Accordingly, it is intended to improve the moldability by lowering the frictional resistance between particles and between particles and molds.

The powder metallurgy method for easy handling pre-warm molding provides a primary molding process for forming a primary molded body with a low density (for example, a density ratio of less than 76%) that can be handled by pressing the mixed powder prior to the warm molding process. The secondary molded body is obtained by performing the secondary molding process while the primary molded body is in a lower temperature than the temperature at which blue shortness occurs, and the primary molded body is once collapsed.

Press twice-Two times sintering The powder metallurgy method creates a raw compact by pressing an iron powder mixture containing an alloying component in a die, and pre-sinters the compact (green compact) at 870℃ for only 5 minutes. This is a method of producing a pre-sintered body, pressing the pre-sintered body to produce a pre-sintered body pressed twice, and then sintering the pre-sintered body pressed twice at 1000°C for 5 minutes to produce a sintered part.

The last one-time molding-sintering powder metallurgy method is predetermined by preheating the mold beforehand, charging the lubricant on the inner surface, and then filling the heated iron-based powder mixture (iron-based powder + lubricant powder) into the mold. Press molding at temperature to form an iron-based powder compact, then sintering with the iron-based powder compact, then bright hardening again, and then tempering to produce an iron-based sintered compact. That's how to do it.

The powder metallurgy products produced as described above fall indiscriminately by the center of gravity when they are discharged after press molding, especially in the production of gear parts, so that the gear parts are frequently damaged and damaged.

The above-described problem is a problem that causes economic loss due to waste of materials, and therefore, a technology capable of reducing the damage of gear parts during discharge is urgently needed.

Patent Document 1: Japanese Patent Publication No. 1-54167 Patent Document 2: Japanese Patent Laid-Open No. 6-182728

The present invention is to solve the problems that occur in the conventional powder metallurgy molding apparatus described above and has the following objects.

It is an object of the present invention to provide a powder metallurgy molding apparatus capable of preventing damage and breakage of parts due to discharge by changing the direction of the gear parts molded by the direction changing means when discharging the gear parts after molding the gear parts by the powder metallurgy molding apparatus. There is a purpose.

In this way, it is an object to provide a powder metallurgy molded product at low cost and productivity by minimizing the defect rate.

In order to achieve the above object, the present invention is provided with a powder metallurgical input hopper for feeding powder metallurgy material into the molding part while moving back and forth from the top of the molding die equipped with the molding part, and the molded part is discharged in front of the molding die. A discharge plate is provided at the bottom of the molding die, and at the bottom of the molding die, a discharge means for discharging the molded product from the molding unit when the upper mold is lowered and raised after molding is provided on the base. Doedoe provided, the discharge plate and the powder metallurgy injection hopper is characterized in that the direction conversion means for changing the direction of the molded product is provided.

The direction changing means is provided at the front end of the discharge plate, and the second gear part of the molded product is obliquely introduced to the direction changing guide having a direction changing groove for inducing direction change,

It is provided in the powder metallurgy input hopper, and a lower direction changeable pusher for pushing the second gear part of the molded product is provided at the bottom, and the upper end of the lower direction changeable pusher is before and after the operation of the piston to push the first gear part of the molded product. It is characterized in that it is provided with a movable push rod in the upper direction.

The direction changing groove is characterized in that it is made of an inclined surface so as to be inclined toward the front when the second gear unit is introduced.

In the present invention, the direction change means is provided at the upper end of the powder metallurgy input hopper to change the direction of the molded product, and a bracket and a straw claw clamping both sides of the second gear part are provided inside the bracket, and the bracket The outer side is provided with a cylinder for moving the straw crab back and forth and a motor that rotates the straw in one direction, and at the lower end of the straw crab is provided with a lower direction changing rod for pushing and transporting the first gear of the converted molded product. There is this.

In the present invention, the direction changing means is provided with a discharge plate, and an arm provided to be interlocked with the rotation axis of the switching unit and the switching unit, and a straw claw provided at the end of the arm to clamp the second gear unit of the molded product. There is a feature.

The present invention is characterized in that a rubber layer is coated on the surface of the straw crab to prevent damage to the second gear when clamping the second gear.

As described, according to the powder metallurgical molding apparatus of the present invention, the gear parts discharged after molding are discharged in a direction change, thereby preventing damage to the molded product and minimizing the defect rate, thereby improving productivity. Of course, it has the effect of providing powder metallurgy products at low cost.

1 is a view for explaining the structure of a powder metallurgy molding apparatus according to a first embodiment of the present invention.
2 to 3 are views for explaining the operating state of the powder metallurgy molding apparatus according to the first embodiment of the present invention.
4 is a view for explaining the structure of a powder metallurgy molding apparatus according to a second embodiment of the present invention.
5 to 6 are views for explaining the operating state of the powder metallurgy molding apparatus according to the second embodiment of the present invention.
7 is a view for explaining the structure of a powder metallurgy molding apparatus according to a third embodiment of the present invention.
8 is a view for explaining the operating state of the powder metallurgy molding apparatus according to the third embodiment of the present invention.

Hereinafter, a structure of a powder metallurgy molding apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms set in consideration of functions in the present invention, and these terms may vary according to the intention or custom of a producer producing a product, and the definitions of terms should be made based on the contents throughout the present specification.

(Example 1)

1 to 3, FIG. 1 is a view for explaining the structure of a powder metallurgy molding apparatus according to a first embodiment of the present invention, and FIGS. 2 to 3 are a first embodiment of the present invention. It is a view for explaining the operating state of the powder metallurgy molding apparatus according to the example.

The powder metallurgy molding apparatus of the present invention is provided with a powder metallurgy injection hopper 106 for inputting the powder metallurgy material into the molding part 102 while moving back and forth from the top of the molding die 101 in which the molding part 102 is provided. , A discharge plate 107 is provided in front of the molding die from which the molded parts are discharged, and a discharge means for discharging the molded product from the molding part 102 when the upper mold 108 descends and rises after molding. 103 is provided on the base 104, and an elevating cylinder 105 for elevating the molding die 101 is provided at the lower end of the base.

At this time, the upper mold 108 is preferably provided on a straight line of the molding portion (102).

Briefly explaining the operation relationship of the molding apparatus 100, first, the powder metallurgy input hopper 106 moves back and forth from the top of the molding die 101 by a driving device (not shown), and the inside of the molding unit 102 The powder metallurgy material is put into the furnace.

And when the input is completed, the upper mold 108 descends to form the product by pressing the molding unit 101, and the upper mold 108 rises, and the elevating cylinder 105 provided at the bottom of the base 104 ) Lowers the forming die 101.

At this time, when the molding die 101 is lowered, the molded product molded in the molding part 102 is raised by the discharge means 103, and the powder metallurgy input hopper 106 moves forward to transfer the molded product to the front. Again, the powder metallurgy material is injected into the molding unit 102.

On the other hand, the discharge plate 107 and the powder metallurgy input hopper 106 is provided with a direction changing means (A) for changing the direction of the molded product.

As provided at the front end of the discharge plate 107, the second gear portion 12 of the molded product 10 is obliquely introduced and has a direction change guide 111 having a direction change groove 112 for inducing a direction change. It is equipped.

At this time, the direction changing groove 112 is formed of an inclined surface so that the direction is changed to be inclined toward the front when the second gear unit 12 is introduced.

In addition, as provided in the powder metallurgy input hopper 106, a lower direction changeable pusher 116 for pushing the second gear part 12 of the molded product 10 is provided at the lower end, and the lower direction changeable pusher 116 The upper end of the molded product 10 is provided with an upper directional pusher 113 provided with a pusher 115 that is movable back and forth in the operation of the piston 114 to push the first gear part 11 of the molded product 10.

Explaining the operation relationship of the above-described direction change means (A), when the molding is completed, the powder metallurgy input hopper 106 moves forward, and at this time, the lower direction change lever 116 is the second gear part of the molded product 10 12 is pushed, and the pusher 115 of the upper turning pusher 113 pushes the first gear part 11 of the molded product 10.

When the molded product 10 transferred in this way is transferred to the direction change guide 111 of the discharge plate 107, the pusher 115 further advances and is formed by the operation of the piston 114 of the upper direction changeable pusher 113. The first gear portion 11 of the product 10 is pushed.

At this time, the second gear part 12 is introduced into the direction change groove 112 of the direction change guide 111 and is inclined toward the front end by the direction change groove 112 having an inclined surface to change the direction of the first gear part 11. ) Is made to be seated on the discharge plate 107 and is discharged.

In this way, since damage and damage to the outer peripheries of the first gear part 11 and the second gear part 12 are prevented and the direction is changed, the defect rate can be reduced.

On the other hand, it is preferable that the direction change guide 111, the push rod 115, and the lower direction change push rod 116 are coated with a rubber layer to prevent damage to the outer periphery of the first and second gears.

Reference numeral 108 is a "conveyor" for conveying molded products, and 130 is a "selection plate" for sorting molded products.

(Example 2)

Figure 4 is a view for explaining the structure of the powder metallurgy molding apparatus according to the second embodiment of the present invention, Figures 5 to 6 show the operating state of the powder metallurgy molding apparatus according to the second embodiment of the present invention. It is a drawing for explanation.

The powder metallurgy molding apparatus of the present invention is provided with a powder metallurgy injection hopper 106 for inputting the powder metallurgy material into the molding part 102 while moving back and forth from the top of the molding die 101 in which the molding part 102 is provided. , A discharge plate 107 is provided in front of the molding die from which the molded parts are discharged, and a discharge means for discharging the molded product from the molding part 102 when the upper mold 108 descends and rises after molding at the bottom of the molding die. 103 is provided on the base 104, and an elevating cylinder 105 for elevating the molding die 101 is provided at the lower end of the base.

At this time, the upper mold 108 is preferably provided on a straight line of the molding portion (102).

Briefly explaining the operation relationship of the molding apparatus 100, first, the powder metallurgy input hopper 106 moves back and forth from the top of the molding die 101 by a driving device (not shown), and the inside of the molding unit 102 The powder metallurgy material is put into the furnace.

And when the input is completed, the upper mold 108 descends to form the product by pressing the molding unit 101, and the upper mold 108 rises, and the elevating cylinder 105 provided at the bottom of the base 104 ) Lowers the forming die 101.

At this time, when the molding die 101 is lowered, the molded product molded in the molding part 102 is raised by the discharge means 103, and the powder metallurgy input hopper 106 moves forward to transfer the molded product to the front. Again, the powder metallurgy material is injected into the molding unit 102.

On the other hand, the powder metallurgy injection hopper 106 is provided with a direction changing means (A) for changing the direction of the molded product.

The direction switching means (A) is provided at the upper end of the powder metallurgy input hopper 106 to change the direction of the molded product 10, the bracket 120 and a second gear part 12 inside the bracket ) Is provided with a straw claw 123 clamping both sides of the bracket 120, and a cylinder 122 for moving the straw claw 123 back and forth and a motor 121 rotating the straw claw 123 in one direction outside the bracket 120 It is equipped.

And at the lower end of the straw (123) is provided with a lower direction shifting pusher 124 for pushing and transporting the first gear portion 11 of the molded product 10 that has been changed in direction.

Meanwhile, the entire bracket 120 is made to be elevated by an elevating device (not shown).

It is preferable that the surface of the straw crab 123 is coated with a rubber layer in order to prevent damage to the second gear when clamping the second gear 12.

The operation relationship of the direction switching means (A) will be described as follows.

First, after the molding is completed, the powder metallurgy input hopper 106 moves forward, but after the molded product 10 is moved to the molding part 102 where the molded product 10 is formed, the cylinder 122 is operated so that the tweezer 123 is moved to the molded product 10 ) Of the second gear part 12 is clamped.

In this state, the bracket 120 is slightly raised and the straw claw 123 is rotated by the motor 121 to rotate the molded product 10 by 180 degrees.

The powder metallurgy input hopper 101 moves forward in the state in which the direction has been changed as described above, and at the same time, by the operation of the cylinder 122, the straw claw 123 holding the second gear moves backward, and the clamping is released and the discharge plate 107 Is transferred to.

Then, the molded product 10, which has been changed in direction, descends along the inclined discharge plate 107.

(Third Example)

7 is a view for explaining the structure of the powder metallurgy molding apparatus according to the third embodiment of the present invention, Figure 8 is a view for explaining the operating state of the powder metallurgy molding apparatus according to the third embodiment of the present invention .

As described in the first and second embodiments, since the configuration of the main parts of the molding apparatus is the same, a detailed description will be omitted, and only the direction switching means (A) will be described.

The direction changing means (A) is provided with a discharge plate 107, an arm 132 interlocked with the switching unit 130 and the rotation shaft 131 of the switching unit, and is provided at the end of the arm It consists of a straw claw 133 clamping the second gear portion 12 of the molded product 10.

It is preferable that the surface of the straw crab 133 is coated with a rubber layer to prevent damage to the second gear when clamping the second gear 12.

Looking at the operation relationship of the above-described direction switching means (A), the molded product 10, which has been formed, is transferred to the discharge plate 107 by transfer to the powder metallurgy input hopper 106.

The second gear portion 12 of the molded product 10 thus transferred is introduced into the straw 133 and rotated by the operation of the switching unit 130 to be seated on the discharge plate 107 to be transferred.

As described above, according to the powder metallurgy molding apparatus, the molded product molded by the direction change means (A) is turned and discharged to prevent damage and breakage of the first and second gears, thereby minimizing the defect rate. There is an advantage.

And because of this, productivity is improved as well as the defect rate is reduced to zero, so there is an advantage of being able to ship at a low unit price.

As described above, specific embodiments of the present invention have been described.

However, the spirit and scope of the present invention is not particularly limited to these specific embodiments, and various modifications and variations are possible within the scope of not changing the subject matter of the present invention. Anyone who has a must understand.

Therefore, the above-described embodiments are provided to completely inform the scope of the invention to those of ordinary skill in the technical field to which the present invention pertains, and should be understood as illustrative and non-limiting in all respects. Is only defined by the scope of the claims.

10: molded product 11: first gear
12: second gear part A: direction switching means
100: powder metallurgy molding device 111: direction change guide
112: direction change groove 113: upper direction change lever
114: push rod 115: piston
116: lower turntable 123: straw

Claims (6)

A powder metallurgy injection hopper 106 is provided to feed the powder metallurgy material into the molding part 102 while moving back and forth from the top of the molding die 101 in which the molding part 102 is provided, and the molding is completed in front of the molding die. A discharge plate 107 from which parts are discharged is provided, and a discharge means 103 for discharging the molded product from the molding part 102 when the upper mold 108 descends and rises after molding is provided at the bottom of the molding die. It is provided on the top, and the bottom of the base is provided with a lifting cylinder 105 for lifting the molding die 101,
The discharge plate 107 and the powder metallurgy input hopper 106 are provided with a direction changing means (A) for changing the direction of the molded product,
It is provided at the front end of the discharge plate 107, the second gear portion 12 of the molded product 10 is inclined to flow in, and a direction change guide 111 having a direction change groove 112 to induce a direction change,
It is provided in the powder metallurgical input hopper 106, and a lower direction changing push rod 116 that pushes the second gear part 12 of the molded product 10 is provided at the bottom,
The upper directional push rod 113 is provided with a push rod 115 that can be moved back and forth in the operation of the piston 114 to push the first gear part 11 of the molded product 10 at the upper end of the lower turning push rod 116. Powder metallurgy molding apparatus, characterized in that provided with). delete The method of claim 1,
The direction changing groove 112 is a powder metallurgy molding apparatus, characterized in that the second gear portion 12 of the molded product 10 is made of an inclined surface so that the direction is inclined toward the front when entering. The method of claim 1,
It is provided in front of the powder metallurgy input hopper 106 to change the direction of the molded product 10,
Bracket 120 and a straw claw 123 clamping both sides of the second gear portion 12 of the molded product 10 are provided on the inside of the bracket 120, and the straw claw 123 is front and rear on the outside of the bracket 120 A cylinder 122 for moving and a motor 121 for rotating the straw crab 123 in one direction are provided,
Powder metallurgy molding apparatus, characterized in that at the bottom of the straw (123) is provided with a lower direction shifting rod (124) for pushing and transporting the first gear (11) of the converted molded product (10). The method of claim 1,
It is provided with a discharge plate 107,
An arm 132 provided to be interlocked with the switching unit 130 and the rotation shaft 131 of the switching unit, and a straw claw 133 provided at an end of the arm to clamp the second gear unit 12 of the molded product 10 Powder metallurgy molding apparatus, characterized in that provided with). The method of claim 4,
Powder metallurgy molding apparatus, characterized in that a rubber layer is coated on the surface of the straw (123) to prevent damage to the second gear when clamping the second gear (12) of the molded product (10).

Images