JP7016785B2 - Mold element and manufacturing method of mold element - Google Patents

Description

The present invention relates to a mold element and a method for manufacturing a mold element.

It is widely used to cast molten metal using a die to manufacture metal products by casting methods such as die casting, molten metal forging, or injection molding of resin, and to manufacture resin molded products by injection molding. It is known that in such casting or injection molding dies, it is necessary to cool or need to cool the dies in order to prevent the temperature of the dies from rising due to molten metal or molten resin material. Temperature control such as preheating and keeping the mold warm is carried out accordingly.

Further, in order to enhance the temperature control effect, it is generally known not only to provide a temperature control passage in the mold body but also to use a separate mold insert that can be inserted and removed from the mold body.

In Patent Document 1, when a mold is manufactured by a so-called 3D printer, a temperature control circuit that serves as a passage for cooling water is simultaneously formed inside the mold, as compared with conventional drilling or the like. It is disclosed that a cooling insert having a high degree of freedom and a high cooling efficiency can be formed. In Patent Document 1, a temperature control circuit is formed inside the mold, and a cooling medium such as cooling water is passed through the temperature control circuit to prevent an excessive temperature rise of the mold and promote directional solidification. ing.

In Patent Document 2, in order to prevent casting defects that occur in the thick part of the cast cast cast by the casting mold, the cooling block (mold insert) of the mold has a shape bent from the inlet to the outlet. By forming a cooling passage and flowing cooling air through the bent cooling passage, the mold portion forming the thick portion is effectively cooled. In Patent Document 2, the cooling block is replaceable, and the temperature is adjusted according to the thickness of the thick portion by appropriately selecting the cooling block to be used according to the thickness of the thick portion.

Japanese Unexamined Patent Publication No. 11-348045 Jitsukaihei 7-33433 Gazette

However, in the conventional cooling nesting described in Patent Documents 1 and 2, the mold portion that needs to be kept at a high temperature during casting or injection molding may be cooled. In this case, cooling and solidification progresses before the molten metal and resin flow to the end of the cavity of the mold, and the fluidity deteriorates, resulting in poor completion of the molded product and defects such as hot water wrinkles. May be done. That is, there is a problem that the temperature cannot be effectively adjusted according to the shape of the molded product, and the occurrence of defective products cannot be reduced.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a mold element and a method for manufacturing a mold element capable of effectively adjusting the temperature according to a molded product. ..

The mold element of the present invention is a metal main body that is removably inserted into the mold and extends in the direction of insertion and removal into the mold, and the tip of the main body in the direction of insertion into the mold. A cooling passage provided inside and through which the cooling medium flows, and a cooling medium provided inside the main body to supply the cooling medium to the cooling passage and discharge the cooling medium that has passed through the cooling passage. A delivery passage, a heat insulating portion provided inside the main body portion and outside the delivery passage, and a heat insulating portion surrounding the delivery passage, and at least inside the tip portion of the main body portion, the heat conduction is higher than that of the main body portion. A high thermal conductivity portion made of a metal having a high rate is provided , and the cooling passage is provided so as to surround the high thermal conductivity portion inside the main body portion .

According to the mold element of the present invention, since the outside of the delivery passage for supplying and discharging the cooling medium is surrounded by the heat insulating portion, the mold portion facing the delivery passage is excessively cooled by the cooling medium. Can be suppressed. Thereby, for example, by covering the portion of the delivery passage facing the portion of the molded product that does not require cooling with the heat insulating portion, effective cooling (temperature adjustment) according to the molded product can be performed.

Further, the cooling passage is formed inside the main body portion so as to extend along a cross-sectional shape in a direction orthogonal to the insertion / removal direction of the main body portion, and the heat insulating portion accommodates a gas for heat insulation. It is preferable to provide a housing portion that surrounds at least a part of the delivery passage. It should be noted that at least a part of the delivery passage is at least a part in the vertical direction and at least a part in the horizontal direction when the axial direction connecting the tip end portion and the base end portion of the main body is in the vertical (vertical) direction. including. That is, the heat insulating portion covers at least a part of the side of the delivery passage and at least a part above the delivery portion.

According to this configuration, the portion of the mold in contact with the tip surface of the main body can be efficiently cooled by the cooling passage. Further, since the heat insulating portion is composed of the gas contained in the accommodating portion, it is possible to insulate the heat insulating portion with a simple structure at low cost.

Further, it is preferable that the heat insulating portion also surrounds the cooling passage.

According to this configuration, supercooling due to the cooling passage can be suppressed. Further, even when the cooling passage is formed in a shape larger than the portion of the mold to be cooled, the heat insulating portion can regulate the cooling range. As a result, the degree of freedom in the shape of the cooling passage is increased, and it is possible to cool the molds having various shapes.

According to this configuration, the heat of the main body portion can be transferred to the high thermal conductivity portion having a high thermal conductivity, so that the temperature of the main body portion can be lowered and the temperature of the mold can be lowered. Further, since the high thermal conductivity portion is covered with the cooling passage, the temperature of the high thermal conductivity portion can be lowered by the cooling passage, and the heat of the main body portion can be further transferred to the high thermal conductivity portion.

Further, the high thermal conductivity portion is formed so as to extend inside the main body portion along a cross-sectional shape in a direction orthogonal to the insertion / removal direction of the main body portion, and the cooling passage is a base of the high thermal conductivity portion. It is preferable that it is provided so as to surround the end portion.

According to this configuration, the tip of the high thermal conductivity part is not surrounded by the cooling passage and is exposed, so that the heat of the main body is higher than that of the tip of the high thermal conductivity part also surrounded by the cooling passage. Can be transferred to the high thermal conductivity section in large quantities.

Further, it is preferable that the high thermal conductivity portion is formed so as to extend to the base end portion of the main body portion, and the heat insulating portion surrounds the delivery passage and the high thermal conductivity portion.

According to this configuration, since the heat insulating portion covers the high thermal conductivity portion, it is possible to prevent the temperature of the main body portion from dropping too much due to the high thermal conductivity portion.

In the method for producing a mold element of the present invention, a first method is to selectively irradiate a metal powder layer made of metal powder with a light beam and melt and solidify a predetermined portion of the metal powder layer to form a metal solidified layer. In the step, a new metal powder layer is formed on the metal solidified layer, and the metal powder layer formed on the metal solidified layer is irradiated with a light beam to melt and solidify a predetermined portion. A second step of forming a solidified metal layer is provided, and by repeating the second step, a mold element composed of the metal, which can be inserted into the mold and extends in the insertion direction into the mold is manufactured. The second step is a step of forming a cooling passage inside the tip of the mold element in the direction of insertion into the mold, and a step of forming a cooling passage inside the mold element. A step of forming a delivery passage for supplying a cooling medium to the cooling passage and discharging the cooling medium that has passed through the cooling passage, and inside the mold element and outside the delivery passage. A step of forming a heat insulating portion that covers a delivery passage, and a high thermal conductivity portion that forms a space constituting a high thermal conductivity portion having a higher thermal conductivity than the metal powder inside at least the tip portion of the mold element. It is characterized by a forming process and preparation.

According to the method for manufacturing a mold element of the present invention, a mold element configured to cover a delivery passage for supplying and discharging a cooling medium with a heat insulating portion can be easily formed. It is possible to prevent the facing portions from being cooled by the cooling medium. Thereby, for example, by surrounding the portion of the delivery passage facing the portion of the molded product that does not require cooling with the heat insulating portion, effective cooling (temperature adjustment) according to the molded product can be performed.

In the method for producing a mold element of the present invention, a first method is to selectively irradiate a metal powder layer made of metal powder with a light beam and melt and solidify a predetermined portion of the metal powder layer to form a metal solidified layer. In the step, a new metal powder layer is formed on the metal solidified layer, and the metal powder layer formed on the metal solidified layer is irradiated with a light beam to melt and solidify a predetermined portion. A second step of forming a solidified metal layer is provided, and by repeating the second step, a mold element composed of the metal, which can be inserted into the mold and extends in the insertion direction into the mold is manufactured. The second step is a step of forming a cooling passage inside the tip of the mold element in the direction of insertion into the mold, and a step of forming a cooling passage inside the mold element. A step of forming a delivery passage for supplying a cooling medium to the cooling passage and discharging the cooling medium that has passed through the cooling passage, and at least on the tip side of the mold element from the cooling passage. A step of forming a high thermal conductivity portion that forms a space constituting a high thermal conductivity portion having a higher thermal conductivity than metal powder, and a heat insulating portion that covers the delivery passage inside the mold element and outside the delivery passage. It is provided with a step of forming and a removing step of removing the unmelted solidified metal powder, and has a higher thermal conductivity at a lower melting point than the metal powder in the high thermal conductivity portion of the mold element after the second step. It is characterized by including a step of filling the metal powder and a step of sintering the mold element at a temperature equal to or higher than the melting point of the metal powder after filling the metal powder.

According to the method for manufacturing a mold element of the present invention, a mold element configured to cover a delivery passage with a heat insulating portion can be easily formed, so that the same effect as described above can be obtained.

Further, in the sintering step having the above configuration, the metal powder having a lower melting point and higher thermal conductivity than the metal powder melts inside the high thermal conductivity portion and adheres to the inner wall surface. Therefore, after the sintering step, the mold element By cooling the mold element, a high thermal conductivity portion made of a metal constituting a metal powder can be integrally formed.

Further, since the high thermal conductivity section has a higher thermal conductivity than the metal solidifying layer constituting the mold element, the heat of the high-temperature resin material or the molten metal in the cavity of the mold is transferred to the high thermal conductivity section through the metal solidifying layer. Can transfer heat to. Due to this heat transfer, the high thermal conductivity portion has a higher temperature than the metal solidified layer, but is cooled by a cooling passage formed near the high thermal conductivity portion. When the high thermal conductivity portion is cooled, the heat of the metal solidified layer can be further transferred to the high thermal conductivity portion. As a result, the temperature of the solidified metal layer can be further lowered, and the hot resin material or the molten metal in the cavity of the mold can be effectively cooled.

Further, since the high thermal conductivity portion is provided on the tip side of the cooling passage, more heat of the metal solidified layer is transferred to the high thermal conductivity portion than in the case where the tip portion of the high thermal conductivity portion is surrounded by the cooling passage. Can be heated.

Furthermore, since it is possible to sufficiently cool the mold cavity without forming the cooling passage close to the tip side of the mold element, a drastic temperature change between the high temperature during molding and the low temperature during cooling is possible. Therefore, even if a minute crack is generated in the mold, it can be surely prevented from affecting the cooling passage.

It is a side view which shows the mold insert and the injection molding die of embodiment of this invention. It is sectional drawing which shows the mold nesting and the mold in the mold open state. It is sectional drawing which shows the mold nesting and the mold in the mold tightening state. It is a perspective view which shows the mold nesting. It is a perspective view which shows the mold nesting of 2nd Embodiment. It is a perspective view which shows the mold nesting of 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
As shown in FIGS. 1 to 3, the mold insert 2 (mold element) is inserted into the mold 10 so as to be removable.

The mold 10 is, for example, a mold for injection molding, includes a first mold 11 (fixed mold) and a second mold 12 (movable mold), and is predetermined by using a molten high-temperature resin material. Molded product M1 (see FIG. 3) is molded. The molding device having the mold 10 is controlled by a control device (not shown).

The mold 10 is clamped by bringing the second mold (movable mold) 12 relatively close to the first mold (fixed mold) 11, and the second mold 12 is brought into contact with the first mold 11. Mold opening is performed by relatively separating them. In the present embodiment, the mold is clamped by moving the second mold 12 to the left in FIG. 1, and the mold is opened by moving the second mold 12 to the right in FIG.

By performing the mold clamping with the first mold 11 and the second mold 12, the cavity 15 in which the resin molded product M1 is molded is formed.

The first mold 11 is provided with a forming recess 11a for forming the cavity 15. The molten high-temperature resin material is supplied from a supply device (not shown) and is filled in the cavity 15 through a supply path and a runner (not shown).

The first mold 11 is formed with an accommodating portion 11b for accommodating the mold insert 2 so as to be movable. The mold insert 2 is moved between the protruding position (see FIG. 3) and the retracted position (see FIG. 2) by a nesting moving portion (not shown) composed of, for example, a hydraulic cylinder or the like. The accommodating portion 11b is provided so that the moving direction of the mold insert 2 moving inside is different from the mold clamping / mold opening direction, but the accommodation portion 11b is not limited to this configuration. In FIG. 1, the sizes of the mold insert 2, the first mold 11, the second mold 12, and the cavity 15 are exaggerated in order to make the configuration of the present embodiment easy to understand.

In the embodiment shown in FIGS. 3 and 4, the mold insert 2 includes a main body portion 21 made of metal (for example, iron or steel) having a two-stage stepped columnar shape, which also serves as positioning for the mold. The shape of the main body 21 can be changed as appropriate, and may be, for example, a triangular column or a square column. Further, a convex portion or a concave portion may be formed on the tip surface of the main body portion 21.

A cooling passage 22 through which a cooling medium (for example, cooling water) flows is formed inside the tip portion (upper end portion in FIGS. 3 and 4) of the main body portion 21. When a convex portion is formed at the tip of the main body portion 21, it is preferable to form a cooling passage 22 inside the convex portion.

Inside the main body 21, a delivery passage 23 is formed that supplies cooling water to the cooling passage 22 and discharges the cooling water that has passed through the cooling passage 22. The delivery passage 23 extends to the base end portion of the main body portion 21.

The delivery passage 23 includes a supply passage 23a and a discharge passage 23b. A supply device (for example, a supply pump) for supplying cooling water is connected to an upstream end portion (lower end portion in FIGS. 3 and 4) of the supply passage 23a. The downstream end (lower end in FIGS. 3 and 4) of the discharge passage 23b is connected to a storage tank for storing used cooling water. In the present embodiment, the cooling passage 22 and the delivery passage 23 are composed of holes formed in the main body portion 21.

In the present embodiment, the cooling water stored in the storage tank has a higher temperature than when it is supplied, so that it is cooled by a cooling device (not shown) and reused as cooling water.

Inside the main body 21, a heat insulating portion 24 surrounding the delivery passage 23 is formed outside the delivery passage 23. The molded product M1 has a thick portion (upper portion) and a thin portion (side portion), and the heat insulating portion 24 faces the thin portion (side portion) of the molded product M1. It is formed in the position. The heat insulating portion 24 is composed of a housing portion which is a cavity formed in the main body portion 21.

[Mold nesting manufacturing method]
The mold insert 2 is manufactured by, for example, a 3D printer (not shown). The 3D printer is well known, and the manufacturing process of the mold insert 2 by the 3D printer will be briefly described below.

In the 3D printer, as the first step, a metal powder layer made of metal (for example, an iron alloy) powder constituting the main body 21 is uniformly spread on a modeling table (not shown) for one layer having a predetermined thickness. The metal powder layer is selectively irradiated with a light beam to solidify the predetermined portion of the metal powder layer to form a metal solidified layer (first layer). In this first step, the portion forming the main body portion 21 of the metal powder layer is irradiated with a light beam. Further, in the first step, the portion forming the delivery passage 23 is not irradiated with the light beam. As a result, by sucking and removing the metal powder that was not used for modeling, a metal solidified layer having two holes for forming the delivery passage 23 is formed in the shape of the main body 21.

As a second step, the 3D printer forms a new metal powder layer on the metal solidification layer (first layer), and selectively irradiates a predetermined portion of the new metal powder layer with a light beam. , A predetermined portion of the new metal powder layer is melt-solidified to form a laminated metal solidified layer (second layer). In this second step, as in the first step, the portion forming the main body portion 21 of the metal powder layer is irradiated with the light beam, and the portion forming the delivery passage 23 is not irradiated with the light beam. As a result, by sucking and removing the metal powder that was not used for modeling, a metal solidifying layer (second layer) having two holes for forming the delivery passage 23 is formed in the shape of the main body 21. Will be done.

By repeating the second step, a mold insert 2 having a predetermined shape composed of a plurality of solidified metal layers is formed.

In the process of forming a plurality of solidified metal layers by repeating the second step, the 3D printer adjusts the range of irradiating the light beam in response to the change in the shape of the main body 21 (change from the large diameter portion to the small diameter portion). Control to change.

Further, the 3D printer controls the portion constituting the heat insulating portion 24 so as not to irradiate the light beam in the process of repeating the second step to form the plurality of solidified metal layers.

Further, the 3D printer was not used for modeling because it was controlled so that the portion constituting the portion of the cooling passage 22 was not irradiated with the light beam in the process of repeating the second step to form a plurality of solidified metal layers. The unmelted metal powder in the cooling passage 22, the delivery passage 23, and the heat insulating portion 24 is suction-removed from the inside of the molding table and the mold insert in the middle of modeling at an appropriate timing during modeling, and is formed as a space.

By performing such control, the mold insert 2 in which the space as the cooling passage 22, the delivery passage 23, and the heat insulating portion 24 is formed inside the main body portion 21 is manufactured. In the present embodiment, the heat insulating portion 24 is filled with heat insulating air.

[Molding process]
When molding a molded product using the mold 10, first, the mold insert 2 is located at the retracted position (see FIG. 2).

Next, the second mold 12 is moved to the left in FIG. 2 and the mold is fastened to form the cavity 15 in which the molded product is molded (see FIG. 3).

Then, the insert moving unit moves the mold insert 2 from the retracted position to the protruding position (see FIG. 3).

Next, the control device of the injection molding die 10 drives the supply device to supply the resin material, and fills the cavity 15 with the resin material through the supply path and the runner. On the other hand, in the mold insert 2, the supply pump is driven to supply cooling water to the supply passage 23a. The cooling water supplied to the supply passage 23a is sent to the cooling passage 22 through the supply passage 23a, and the cooling water passing through the cooling passage 22 is stored in the storage tank through the discharge passage 23b.

In FIG. 3, the portion of the molded product M1 above the mold insert 2 is thicker than the portion on the side of the mold insert 2, and it takes time to cool and solidify. In the present embodiment, the thick portion of the molded product M1 can be cooled (temperature adjusted) by the cooling water passing through the cooling passage 22 of the mold insert 2. As a result, the solidification time of the molded product M1 can be shortened.

On the other hand, in the molded product M1, the lateral portion of the mold insert 2 in FIG. 3 is thinner than the upper portion, and is easily cooled and solidified. Therefore, when the thin portion of the molded product M1 is excessively cooled by the cooling water passing through the cooling passage 22 and the delivery passage 23 of the mold insert 2, the resin material is solidified before being filled in the cavity 15. It may end up.

In the present embodiment, the mold insert 2 is formed with a heat insulating portion 24 surrounding the delivery passage 23 at a position facing the thin portion of the molded product M1. As a result, the resin material is not excessively cooled and solidified by the cooling water passing through the delivery passage 23.

After the resin material filled in the cavity 15 is solidified, the insert moving portion moves the mold insert 2 from the protruding position to the retracted position (see FIG. 2). Next, the second mold 12 is moved to the right in FIG. 1 to open the mold. Then, the molded product M1 is removed from the mold 10. As a result, the molded product M1 is molded.

[Second Embodiment]
In the second embodiment shown in FIG. 5, the mold insert 50 includes a main body portion 21, a cooling passage 52, a delivery passage 53, and a heat insulating portion 24. The same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The cooling passage 52 is formed so as to extend in an arc shape along the lateral cross-sectional shape of the upper portion of the main body portion 21. Further, the downstream end of the cooling passage 52 extends inward and is connected to the supply passage 53a. As a result, the cooling passage 52 has a longer length than the cooling passage 22 of the first embodiment, and the tip side close to the cavity 15 can be centrally cooled, so that the cooling performance by the cooling passage 52 is also improved. The cooling passage 52 may be formed so as to be longer than the cooling passage 22, and may have, for example, a plurality of bent shapes or an enlarged passage diameter.

The delivery passage 53 includes a supply passage 53a and a discharge passage 53b, similarly to the delivery passage 23 of the first embodiment. The inlet portion of the cooling passage 52 is formed outside the upstream end portion of the supply passage 53a. In the second embodiment, the supply passage 53a is formed so as to be connected to the inlet portion of the cooling passage 52 so that the downstream end portion is inclined outward toward the downstream side.

The mold insert 50 is manufactured by a 3D printer in the same manner as the mold insert 2 of the first embodiment. The 3D printer can manufacture the mold insert 50 by controlling the portion forming the cooling passage 52, the delivery passage 53, and the heat insulating portion 24 so as not to irradiate the light beam. The shape of the child 50 and the shape and layout of the internal cooling passage 52, the delivery passage 53, and the heat insulating portion 24 can be freely designed.

[Third Embodiment]
In the third embodiment shown in FIG. 6, the mold insert 100 includes a main body portion 21, a cooling passage 102, a delivery passage 23, a heat insulating portion 24, and a high thermal conductivity portion 105. The same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The cooling passage 102 is connected to the downstream end of the supply passage 23a and extends outward, then extends in an arc shape along the cross-sectional shape of the main body 21, and finally is connected to the upstream end of the discharge passage 23b. It is formed so as to extend inward. As a result, the cooling passage 102 has a longer length than the cooling passage 22 of the first embodiment, and since the flow path is squeezed, the tip side near the cavity 15 can be intensively cooled, and the cooling passage 102 can be cooled. Cooling performance is also improved.

The high thermal conductivity portion 105 is made of a metal (for example, copper) having a higher thermal conductivity than the main body portion 21 (iron).

The high thermal conductivity portion 105 passes through the outside of the delivery passage 23 and is formed so as to extend in an arc shape inside the cooling passage 102, and a part of the high thermal conductivity portion 105 in the circumferential direction is surrounded by the cooling passage 102. In the third embodiment, the heat insulating portion 24 surrounds a part of the delivery passage 23 and a part of the high thermal conductivity portion 105.

Further, the high thermal conductivity portion 105 is formed so that the arc-shaped extending portion protrudes from the cooling passage 102 toward the tip end side (upper end side in FIG. 6) of the main body portion 21.

The mold insert 100 is manufactured by a 3D printer in the same manner as the mold insert 2 of the first embodiment. The 3D printer controls the portion forming the cooling passage 102, the delivery passage 23, the heat insulating portion 24, and the high thermal conductivity portion 105 so as not to irradiate the light beam. As a result, the portion of the high thermal conductivity portion 105 becomes a cavity.

In this embodiment, after further molding the mold insert 100 with a 3D printer, the high thermal conductivity portion 105 of the cavity is filled with copper powder (metal powder), and the mold insert 100 is fired in a sintering furnace in that state. Perform the tying process.

The sintering temperature is generally 800 ° C. to 1300 ° C., which is lower than the melting temperature of iron, which is the main raw material of the mold insert 100. In this sintering step, copper having a melting temperature lower than that of iron melts inside the high thermal conductivity portion 105 and adheres to the inner wall surface. After that, by cooling the mold insert 100, the copper high thermal conductivity portion 105 in close contact with the inside is integrally formed with the mold insert 100.

The sintering step can also be carried out after the modeling step with the 3D printer in the first and second embodiments, and the melt-solidified state by the laser is more uniformly and more reliably melt-bonded and molded. The strength of the product can be further improved.

Since the high thermal conductivity portion 105 has a higher thermal conductivity than the main body portion 21 of the mold insert 100, the heat of the high-temperature resin material in the cavity 15 is transferred through the main body portion 21, and the temperature is higher than that of the main body portion 21. Will be higher. In the third embodiment, since the cavity 15 side having the highest temperature of the high thermal conductivity portion 105 having a higher temperature than the main body portion 21 is surrounded by the cooling passage 102, the high thermal conductivity portion 105 can be reliably cooled. When the high thermal conductivity portion 105 is cooled, the heat of the main body portion 21 can be further transferred to the high thermal conductivity portion 105, the temperature of the main body portion 21 is lowered, and the thick portion of the molded product M1 is cooled. Can be done.

Further, since the cooling passage 102 surrounds only the base end portion of the high thermal conductivity portion 105 and the tip portion of the high thermal conductivity portion 105 is exposed, the tip portion of the high thermal conductivity portion 105 is also provided by the cooling passage 102. Compared to the surrounding one, more heat of the main body portion 21 can be transferred to the high thermal conductivity portion 105.

Further, according to the configuration of the third embodiment, the cavity 15 can be sufficiently cooled without forming the cooling water passage 102 close to the tip end side of the mold insert 100, so that the cavity 15 can be sufficiently cooled at the time of molding. Even if a minute crack is generated in the mold due to a drastic temperature change between a high temperature and a low temperature during cooling, it is possible to surely prevent the cooling passage 102 from being affected.

Further, since the heat insulating portion 24 covers a part of the high thermal conductivity portion 105, it is possible to prevent the temperature of the main body portion 21 from dropping too much by the high thermal conductivity portion 105.

The present invention has been described above with respect to preferred embodiments thereof, but as can be easily understood by those skilled in the art, the present invention is not limited to such embodiments and deviates from the gist of the present invention. It can be changed as appropriate to the extent that it does not.

For example, the position and shape of the heat insulating portion 24 can be appropriately changed, and a plurality of heat insulating portions 24 may be formed. Further, a recess or a hole may be formed in the heat insulating portion 24.

In the above embodiment, the present invention is carried out for a mold insert used for an injection molding die for molding a resin molded product M1 by supplying a molten resin material from a supply device, but the present invention is limited to this. Instead, for example, the present invention may be carried out on a mold insert used for a casting mold for casting a metal product by supplying molten metal from a supply device. In this case as well, the same effect can be obtained, and the molten metal is not excessively cooled and solidified by the cooling water passing through the delivery passage.

In the above embodiment, the mold insert is manufactured by a 3D printer, but the manufacturing method can be changed as appropriate. For example, the mold insert is divided into a plurality of parts in the vertical direction or the horizontal direction, and each divided portion is used. May be manufactured by, for example, individually molding or casting with a mold and joining a plurality of divided portions.

In addition, not all of the components shown in the above embodiments are indispensable, and they can be appropriately selected as long as they do not deviate from the gist of the present invention.

2,50,100 ... Mold insert (mold element), 10 ... Mold, 21 ... Main body, 22,52,102 ... Cooling passage, 23,53 ... Delivery passage, 23a, 53a ... Supply passage, 23b , 53b ... Discharge passage, 24 ... Insulation part, 105 ... High thermal conductivity part

Claims (7)

A metal body that is removably inserted into the mold and extends in the direction of insertion and removal into the mold .
A cooling passage provided inside the tip portion of the main body portion in the direction of insertion into the mold and through which a cooling medium flows.
A delivery passage provided inside the main body, which supplies the cooling medium to the cooling passage and discharges the cooling medium that has passed through the cooling passage.
A heat insulating portion provided inside the main body and outside the delivery passage and surrounding the delivery passage,
A high thermal conductivity portion provided at least inside the tip portion of the main body portion and made of a metal having a higher thermal conductivity than the main body portion.
Equipped with
The mold element characterized in that the cooling passage is provided inside the main body portion so as to surround the high thermal conductivity portion . In the mold element according to claim 1,
The cooling passage is formed inside the main body portion so as to extend along a cross-sectional shape in a direction orthogonal to the insertion / removal direction of the main body portion.
The heat insulating portion is a mold element that accommodates a gas for heat insulating and includes an accommodating portion that surrounds at least a part of the delivery passage. In the mold element according to claim 1 or 2.
The heat insulating portion is a mold element characterized by surrounding the cooling passage. In the mold element according to any one of claims 1 to 3,
The high thermal conductivity portion is formed so as to extend inside the main body portion along a cross-sectional shape in a direction orthogonal to the insertion / removal direction of the main body portion.
The mold element characterized in that the cooling passage is provided so as to surround the base end portion of the high thermal conductivity portion. In the mold element according to any one of claims 1 to 4,
The high thermal conductivity portion is formed so as to extend to the base end portion of the main body portion.
The heat insulating portion is a mold element that surrounds the delivery passage and the high thermal conductivity portion. The first step of selectively irradiating a metal powder layer made of metal powder with a light beam to melt and solidify a predetermined portion of the metal powder layer to form a metal solidified layer.
A new metal powder layer is formed on the metal solidified layer, and the metal powder layer formed on the metal solidified layer is irradiated with a light beam to melt and solidify a predetermined portion to melt and solidify the new metal solidified layer. The second step of forming
A mold element manufacturing method for manufacturing a mold element composed of the metal, which can be inserted into a mold and extends in the direction of insertion into the mold, by repeating the second step.
The second step is
A step of forming a cooling passage inside the tip of the mold element in the direction of insertion into the mold, and
A step of forming a delivery passage inside the mold element, which supplies a cooling medium to the cooling passage and discharges the cooling medium that has passed through the cooling passage.
A step of forming a heat insulating portion covering the delivery passage inside the mold element and outside the delivery passage.
A step of forming a high thermal conductivity portion, which forms a space forming a high thermal conductivity portion having a higher thermal conductivity than the metal powder, at least inside the tip portion of the mold element.
A mold element manufacturing method characterized by comprising. The first step of selectively irradiating a metal powder layer made of metal powder with a light beam to melt and solidify a predetermined portion of the metal powder layer to form a metal solidified layer.
A new metal powder layer is formed on the metal solidified layer, and the metal powder layer formed on the metal solidified layer is irradiated with a light beam to melt and solidify a predetermined portion to melt and solidify the new metal solidified layer. The second step of forming
A mold element manufacturing method for manufacturing a mold element composed of the metal, which can be inserted into a mold and extends in the direction of insertion into the mold, by repeating the second step.
The second step is
A step of forming a cooling passage inside the tip of the mold element in the direction of insertion into the mold, and
A step of forming a delivery passage inside the mold element, which supplies a cooling medium to the cooling passage and discharges the cooling medium that has passed through the cooling passage.
A step of forming a high thermal conductivity portion, which forms a space forming a high thermal conductivity portion having a higher thermal conductivity than the metal powder, at least on the tip side of the mold element from the cooling passage.
A step of forming a heat insulating portion covering the delivery passage inside the mold element and outside the delivery passage.
A removal step for removing the unmelted solidified metal powder is provided.
A step of filling the high thermal conductivity portion of the mold element after the second step with a metal powder having a melting point lower than that of the metal powder and having a high thermal conductivity.
A step of sintering the mold element at a temperature equal to or higher than the melting point of the metal powder after filling the metal powder.
A mold element manufacturing method comprising.

Images