JP2024059521A - Manufacturing method for mold die parts - Google Patents

Abstract

[Problem] To prevent rust from forming inside a water pipe and to prevent deposits of impurities contained in water. [Solution] The method includes a dividing step of dividing a mold die part into a first mold die part piece 11 and a second mold die part piece 12, a water channel forming step of forming water channels by drilling inside the first mold die part piece 11 and the second mold die part piece 12, a processing step of applying rust-proofing and deposit-proofing treatment to the inner surface of the water channel formed inside the first mold die part piece 11 and the second mold die part piece 12, and a joining step of positioning the first mold die part piece 11 and the second mold die part piece 12 that have been treated to prevent rust and deposit adhesion in the processing step with positioning pins and integrating them by metal joining. [Selected Figure] Figure 3

Description

The present invention relates to a method for manufacturing mold die parts.

A mold part is known that is equipped with a movable insert that is attached to the fixed insert so that it can move back and forth, and a temperature adjustment means that is attached to the same direction as the movable insert so that it can move back and forth, and that is made up of a cooling tube or the like for adjusting the temperature of the movable insert (see, for example, Patent Document 1).

Generally, in a molding die part, in order to speed up cooling of the molded product, a water pipe is arranged in the molding die part that abuts against the heat storage portion of the molded product, thereby speeding up the molding cycle.
For this reason, the water tubes of typical mold die parts are designed with straight holes drilled in multiple directions to cool the areas that need cooling.
In addition, water is often used for cooling, and is circulated inside the mold die parts using a chiller.

JP 2005-219445 A

After the production of the molded product is completed, the cooling water is drained from the mold die parts and the water in the water pipes is removed.
However, it is not possible to completely remove the water from within the water pipe, and water will remain in some areas, causing the problem of rust.

Furthermore, when the rust is severe, it may clog the water pipes partially or entirely, making the mold part unusable thereafter.
Furthermore, impurities contained in the water accumulate inside the water pipes and cause them to become clogged along with rust.

The present invention was made in consideration of the above-mentioned problems, and aims to provide a manufacturing method for mold die parts that suppresses the occurrence of rust inside water pipes and also suppresses the occurrence of deposits of impurities contained in water, etc.

Form 1: One or more embodiments of the present invention propose a method for manufacturing a mold die part, comprising: a dividing step of dividing a mold die part into a first mold die part piece and a second mold die part piece; a channel forming step of forming channels by drilling inside the first mold die part piece and the second mold die part piece; a processing step of applying rust-proofing and deposit-proofing treatment to the inner surface of the channel formed inside the first mold die part piece and the second mold die part piece; and a joining step of positioning the first mold die part piece and the second mold die part piece that have been treated to be rust-proof and deposit-proofing in the processing step with a positioning pin and integrating them by metal joining.

Mode 2: One or more embodiments of the present invention propose a method for manufacturing a mold die component, characterized in that a plurality of recesses for holding both ends of the positioning pin are provided on the inner outer periphery of the first mold die component piece and the second mold die component piece, and in the joining process, the positioning pin is held and positioned in the recesses of the first mold die component piece and the second mold die component piece that have been treated to be rust-proof and prevent deposit adhesion, and the mold die components are integrated by metal joining.

Mode 3: One or more embodiments of the present invention propose a method for manufacturing mold die parts, characterized in that a positioning through hole is provided in the center of the first mold die part piece and the second mold die part piece, and in the joining process, the positioning pin is inserted into the through hole of the first mold die part piece and the second mold die part piece that have been treated to be rust-proof and prevent deposit adhesion, a plate-shaped magnet is attached to the side straddling the first mold die part piece and the second mold die part piece to position them, and they are integrated by metal joining.

Mode 4: One or more embodiments of the present invention propose a method for manufacturing a mold die component, characterized in that recesses for holding both ends of the positioning pin are provided in the internal center of the first mold die component piece and the second mold die component piece, and in the joining process, the positioning pin is held in the recesses of the first mold die component piece and the second mold die component piece that have been treated to be rust-proof and prevent deposit adhesion, a plate-shaped magnet is attached to the side straddling the first mold die component piece and the second mold die component piece to position them, and they are integrated by metal joining.

Mode 5: One or more embodiments of the present invention propose a method for manufacturing mold die parts, characterized in that a plurality of positioning through holes are provided on the outer side surfaces of the product outline of the first mold die part piece and the second mold die part piece, and in the joining process, the positioning pins are inserted into the through holes of the first mold die part piece and the second mold die part piece that have been treated to be rust-proof and prevent deposit adhesion, to position them, and the parts are integrated by metal joining.

Embodiment 6: One or more embodiments of the present invention propose a method for manufacturing mold die parts, characterized in that the rust-proofing and deposit adhesion prevention treatment is a plating treatment.

Mode 7: One or more embodiments of the present invention propose a method for manufacturing mold die parts, characterized in that the rust-proofing and deposit adhesion prevention treatment is a coating treatment.

Embodiment 8: One or more embodiments of the present invention propose a method for manufacturing mold die parts, in which the rust-proofing and deposit adhesion prevention treatment is a thermal spray coating treatment.

According to one or more embodiments of the present invention, it is possible to suppress the occurrence of rust inside the water pipe and to suppress the occurrence of deposits of impurities contained in the water.

FIG. 1 is a diagram showing a schematic configuration of an injection molding machine in which a mold die part according to an embodiment of the present invention is used. 1A and 1B are a front perspective view, a top plan view, and a front view of a mold die part according to a first embodiment of the present invention; FIG. 2 is a flow diagram of a manufacturing method for a mold die part according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of a water pipe of a mold die part according to a first embodiment of the present invention. 5A-5C are a front perspective view, a top plan view, and a front view of a molding die part according to a second embodiment of the present invention; FIG. 6 is a flow diagram of a method for manufacturing a mold die part according to a second embodiment of the present invention. 13A-13D are a front perspective view, a top plan view, and a front view of a molding die part according to a third embodiment of the present invention. FIG. 11 is a flow diagram of a manufacturing method for a mold die part according to a third embodiment of the present invention. 13A and 13B are a front perspective view, a top plan view, and a front view of a molding die part according to a fourth embodiment of the present invention. FIG. 11 is a flow diagram of a manufacturing method for a mold die part according to a fourth embodiment of the present invention.

<Embodiment>
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

First, before explaining the manufacturing method of the mold die parts using FIG. 1, the configuration of the injection molding and the injection molding machine used for the mold die parts manufactured by the manufacturing method of the mold die parts according to all the embodiments will be explained.

<Injection molding>
Injection molding is a method of obtaining a molded product by injecting heated and molten material into a mold and then cooling and solidifying it.
Injection molding is suitable for mass production of products with complex shapes.
The injection molding process is broadly divided into six steps: mold clamping, injection, pressure holding, cooling, mold opening, and product removal.

<Configuration of injection molding machine>
In general, an injection molding machine is mainly composed of a mold clamping unit 20 and an injection unit 30.

As shown in FIG. 1 , an injection molding machine 1 according to this embodiment includes a mold 10 , a mold clamping unit 20 , and an injection unit 30 .
The injection unit 30 includes a hopper 31 , a cylinder 32 , and a motor 33 .

The mold clamping unit 20 opens, closes, and ejects the mold 10, and is available in two types: a toggle type and a direct pressure type that opens and closes the mold directly using a hydraulic cylinder.

The injection unit 30 heats and melts the resin, and injects it into the mold.
Then, a screw (not shown) in the cylinder 32 is rotated, and the resin fed from the hopper 31 is stored and measured in front of the screw, and after storing a stroke equivalent to the required amount of resin, it is injected.
When the resin is flowing inside the mold 10, the screw movement speed (injection speed) is controlled, and after the resin is filled, the pressure (holding pressure) is controlled.
The switch from speed control to pressure control is set to occur when a certain screw position or a certain injection pressure is reached.

The mold 10 is a metal die into which resin is injected to give a specific shape, and is made up of a movable mold part 10A and a fixed mold part 10B.
The movable mold part 10A is movable by a mold clamping unit 20.
A water pipe (not shown) is formed inside the movable mold die part 10A, and water is circulated through the water pipe by a chiller to cool heat storage parts of the molded product and speed up the molding cycle.
The molten material enters the mold 10 from the sprue, passes through a runner gate (not shown), and fills the cavity (not shown).
Then, after a cooling process, the mold 10 is opened and an ejector plate (not shown) of the mold 10 is pushed by an ejector rod (not shown) of the molding machine to eject the molded product.

First Embodiment
The movable mold die part 10A according to this embodiment will be described below with reference to FIGS.

<Configuration of movable mold die part 10A>
As shown in FIG. 2A, a movable mold die part 10A according to this embodiment is comprised of a first mold die part piece 11A and a second mold die part piece 12A.
As shown in FIG. 2A, a water channel 13 spanning the first mold die component piece 11A and the second mold die component piece 12A is formed in the first mold die component piece 11A and the second mold die component piece 12A, for example, by drilling.
The shape of the water channel 13 is, for example, a hook shape made up of a combination of straight lines, as shown in FIG. 3B.
Also, as shown in FIG. 2(C), between the outer edge of the movable mold die part 10A and the outer edge of the water channel, recesses 14a for holding positioning pins are formed inside both the first mold die die part piece 11A and the second mold die die part piece 12A.

As shown in FIG. 4, the inner surface of the water channel 13 formed in the first mold die part piece 11A and the second mold die part piece 12A is treated with a rust-proofing and deposit-proofing treatment 16, which includes plating, coating, and thermal spraying.

After the rust-proofing and deposit-adhesion prevention treatment 16 is applied, the first mold die component piece 11A and the second mold die component piece 12A are metal-joined, for example, by a diffusion bonding method.

In addition, when the diffusion bonding method is used for the rust prevention and deposit adhesion prevention processing 16, the processing temperature becomes 600°C to 1000°C, and heat treatment is required after bonding, so heat resistance is required.
For this reason, in the case of plating, hard chrome plating is preferred. Although the composition changes when exposed to heat above 700° C., anti-rust and mold release effects can be expected.
In the case of coating, a TiAlN or AlCrN film containing aluminum and having a high heat resistance is preferable.
Furthermore, in the case of thermal spray coating, there are many coatings that are heat resistant and have releasability, so there are a wide variety of options.

<Method of manufacturing movable mold die part 10A>
A method for manufacturing the movable mold die part 10A according to this embodiment will be described with reference to FIG.

First, a movable mold die part 10A that does not include the water channel 13 is created (step S100).
The movable mold die part 10A may be produced by a conventional production method or the like.

The movable mold die part 10A created in step S100 is subjected to a processing process to form a water channel 13 therein by drilling (step S200).

In step S200, a division process is carried out to divide the movable mold die part 10A in which the water channel 13 is formed into a first mold die part piece 11A and a second mold die part piece 12A (step 300).

The inner surface of the water channel 13 formed in the first mold die component piece 11A and the second mold die component piece 12A created in step S300 is subjected to anti-rust and anti-deposit treatment 16 by plating, coating, spray coating, etc. (step S400).

In step S400, the first mold die component piece 11A and the second mold die component piece 12A, which have been treated with anti-rust and anti-deposit treatment 16, are cleaned with a metal cleaner to remove anti-rust oil and markings (marker), and the joint surface 15 is cleaned with an air blower to prevent dust and other particles from adhering thereto (step S500).

First mold die component piece 11A and second mold die component piece 12A, which have been degreased and cleaned in step S500, are placed on a pedestal to be set in the diffusion bonding apparatus.
At this time, the first mold die component piece 11A is placed so that one end of the positioning pin is inserted into the two positioning pin recesses 14a of the second mold die component piece 12A and the other end of the positioning pin is inserted into the two positioning pin recesses 14a of the first mold die component piece 11A.
Next, first mold die part piece 11A is positioned so as to remove air from the contact surface between first mold die part piece 11A and second mold die part piece 12A (step S600).

Next, the first mold die component piece 11A and the second mold die component piece 12A are placed in the diffusion bonding device (step S800).

Then, the first mold die component piece 11A and the second mold die component piece 12A are metal-joined using a diffusion bonding device to produce the movable mold die component 10A (step S900).

<Action and Effects>
In the movable mold die part 10A of this embodiment, multiple recesses 14a that hold both ends of a positioning pin are provided on the inner outer periphery of the first mold die part piece 11A and the second mold die part piece 12A, and in the joining process, the positioning pin is held and positioned in the recesses 14a of the first mold die part piece 11A and the second mold die part piece 12A, which have been treated to prevent rust and deposit adhesion, and the parts are integrated by metal joining.
In other words, metal joining is performed with positioning pins inserted into recesses 14a that are provided in multiple locations on the outer periphery of first mold die component piece 11A and second mold die component piece 12A and hold the positioning pins, so that first mold die component piece 11A and second mold die component piece 12A are joined with high precision, and water channel 13 is formed without misalignment.
Furthermore, since the water channel 13 is formed without any misalignment, the occurrence of new rust or the like caused by misalignment of the water channel 13 can be reliably prevented.
In addition, since the positioning pins are located inside, the appearance of the product is not marred.

Moreover, in the movable mold die part 10A according to this embodiment, the water passage 13 is formed by drilling.
Therefore, a straight water channel can be formed inside the mold die part.
The inner surface of the water passage 13 formed by drilling has a rough surface, which, if left untreated, will promote the formation of rust and encourage the formation of deposits of impurities contained in water.
However, in the movable mold die part 10A according to this embodiment, the water passage 13 formed inside is subjected to anti-rust and anti-deposit treatment 16, which is performed by plating, coating, or spraying film treatment.
Therefore, it is possible to obtain a movable mold die part 10A that suppresses the occurrence of rust inside the water channel 13 and also suppresses the occurrence of deposits of impurity components contained in the water.

Furthermore, the movable mold die part 10A according to this embodiment is provided with anti-rust and anti-deposit treatment 16 by plating.
That is, the inner surface of the water passage 13 formed by drilling has surface roughness, but this surface roughness is corrected by plating.
Therefore, it is possible to obtain a movable mold die part 10A that suppresses the occurrence of rust inside the water channel 13 and also suppresses the occurrence of deposits of impurity components contained in the water.

Furthermore, the movable mold die part 10A according to this embodiment is subjected to rust prevention and deposit adhesion prevention processing 16 by a coating process.
That is, the inner surface of the water passage 13 formed by drilling has surface roughness, but this surface roughness is treated with a coating.
Therefore, it is possible to obtain a movable mold die part 10A that suppresses the occurrence of rust inside the water channel 13 and also suppresses the occurrence of deposits of impurity components contained in the water.

Furthermore, the movable mold die component 10A according to this embodiment has the rust-proofing and deposit adhesion prevention processing 16 performed by thermal spraying film processing.
That is, the inner surface of the water passage 13 formed by drilling has surface roughness, but this surface roughness is treated with a thermal spray coating.
Therefore, it is possible to obtain a movable mold die part 10A that suppresses the occurrence of rust inside the water channel 13 and also suppresses the occurrence of deposits of impurity components contained in the water.

Moreover, the first molding die piece 11 and the second molding die piece 12 according to this embodiment are metal-jointed by a diffuse joining method.
The diffusion bonding method has the advantage that one metal bonding process can be performed in a short time and the bonding strength is close to 100%.
Therefore, this is a suitable method for metal joining of the movable mold part 10A, which requires strength.

Second Embodiment
The movable mold die part 10A1 according to this embodiment will be described below with reference to FIGS.

<Configuration of Movable Mold Die Part 10A1>
As shown in FIG. 5A, a movable mold die part 10A1 according to this embodiment is made up of a first mold die part piece 11B and a second mold die part piece 12B.
As shown in FIG. 5A, a water channel 13 spanning the first mold die component piece 11B and the second mold die component piece 12B is formed in the first mold die component piece 11B and the second mold die component piece 12B, for example, by drilling.
The shape of the water channel 13 is, for example, a hook shape made up of a combination of straight lines, as shown in FIG. 5(B).
Also, as shown in FIG. 5(C), a through hole 14B is formed in the center of the movable mold die part 10A1, which passes through the first mold die part piece 11B and the second mold die part piece 12B and into which a positioning pin is inserted.

As shown in FIG. 4, the inner surface of the water channel 13 formed in the first mold die part piece 11B and the second mold die part piece 12B is treated with a rust-proofing and deposit-proofing treatment 16, which includes plating, coating, and thermal spraying.

After the rust-proofing and deposit-adhesion prevention treatment 16 is applied, the first mold die component piece 11B and the second mold die component piece 12B are metal-joined, for example, by a diffusion bonding method.

In addition, when the diffusion bonding method is used for the rust prevention and deposit adhesion prevention processing 16, the processing temperature becomes 600°C to 1000°C, and heat treatment is required after bonding, so heat resistance is required.
For this reason, in the case of plating, hard chrome plating is preferred. Although the composition changes when exposed to heat above 700° C., anti-rust and mold release effects can be expected.
In the case of coating, a TiAlN or AlCrN film containing aluminum and having a high heat resistance is preferable.
Furthermore, in the case of thermal spray coating, there are many coatings that are heat resistant and have releasability, so there are a wide variety of options.

<Method of manufacturing movable mold die part 10A1>
A method for manufacturing the movable mold part 10A1 according to this embodiment will be described with reference to FIG.

First, a movable mold die part 10A1 that does not include the water channel 13 is created (step S110).
The movable mold die part 10A1 may be produced by a conventional production method or the like.

The movable mold die part 10A1 created in step S110 is subjected to a processing process to form a water channel 13 therein by drilling (step S210).

In step S210, a division process is carried out to divide the movable mold die part 10A1 in which the water channel 13 is formed into a first mold die part piece 11B and a second mold die part piece 12B (step 310).

The inner surface of the water channel 13 formed in the first mold die component piece 11B and the second mold die component piece 12B created in step S310 is subjected to anti-rust and anti-deposit treatment 16 by plating, coating, spray coating, etc. (step S410).

In step S410, the first mold die component piece 11B and the second mold die component piece 12B, which have been treated with the rust prevention and deposit adhesion prevention treatment 16, are treated with a metal cleaner to remove rust prevention oil and markings (marker), and the joint surface 15 is cleaned with an air blower to prevent dust and other particles from adhering thereto (step S510).

First molding die component piece 11B and second molding die component piece 12B, which have been degreased and cleaned in step S510, are placed on a pedestal that is set in the diffusion bonding apparatus.
At this time, the first molding die part piece 11B is placed on top of the second molding die part piece 12B, with the position shifted.
The position of the positioning pin hole (through hole) 14 is aligned in the same direction.
Next, first mold die part piece 11B is slid so as to remove air from the contact surface between first mold die part piece 11B and second mold die part piece 12B, and once the position is roughly aligned, the position of positioning pin hole 14 is checked to ensure it is aligned and fine adjustments are made. Once aligned, a positioning pin is inserted into positioning pin hole 14 from the pointed side, and a plate-shaped magnet 17 is attached to the side spanning first mold die part piece 11B and second mold die part piece 12B to perform positioning (step S610).

Then, in step S610, when the positioning is completed, one of the previously inserted pins is removed and replaced with a shorter positioning pin, and this operation is repeated for all the positioning pins.
Furthermore, after confirming that the newly inserted short positioning pin is hidden within the positioning pin hole 14B, the deviation of the outer shape is adjusted.
The newly inserted positioning pin is not removed, but is sintered during the metal joining process (step S710).

Next, the first mold die component piece 11B and the second mold die component piece 12B are placed in a diffusion bonding device, and the magnet 17 is removed (step S810).

Then, the first mold die component piece 11 and the second mold die component piece 12 are metal-joined using a diffusion bonding device to produce the movable mold die component 10A1 (step S910).

<Action and Effects>
In the movable mold die part 10A1 of this embodiment, a positioning through hole 14B is provided in the center of the first mold die part piece 11B and the second mold die part piece 12B, and a positioning pin is inserted into the through hole 14 of the first mold die part piece 11B and the second mold die part piece 12B. A plate-shaped magnet 17 is attached to the side straddling the first mold die part piece 11B and the second mold die part piece 12B to position them, and they are integrated by metal joining.
Therefore, first molding die part piece 11B and second molding die part piece 12B are joined with high precision, so that water channel 13 is formed without misalignment.
Furthermore, since the water channel 13 is formed without any misalignment, the occurrence of new rust or the like caused by misalignment of the water channel 13 can be reliably prevented.
It should be noted that instead of magnets, clamps, jigs, or the like may be used to mechanically hold the substrate in place.

Third Embodiment
The movable mold die part 10A2 according to this embodiment will be described below with reference to FIGS.

<Configuration of Movable Mold Die Part 10A2>
As shown in FIG. 7A, a movable mold die part 10A2 according to this embodiment is made up of a first mold die part piece 11C and a second mold die part piece 12C.
As shown in FIG. 7(A), a water channel 13 spanning the first mold die component piece 11C and the second mold die component piece 12C is formed in the first mold die component piece 11C and the second mold die component piece 12C, for example, by drilling.
The shape of the water channel 13 is, for example, a hook shape made up of a combination of straight lines, as shown in FIG. 7B.
Also, as shown in FIG. 7(C), in the center of the movable mold die part 10A2, recesses 14a for holding positioning pins are formed in both the first mold die part piece 11C and the second mold die part piece 12C.

As shown in FIG. 4, the inner surface of the water channel 13 formed in the first mold die part piece 11C and the second mold die part piece 12C is treated with a rust-proofing and deposit-proofing treatment 16, which includes plating, coating, and thermal spraying.

After the rust-proofing and deposit-adhesion prevention treatment 16 is applied, the first mold die component piece 11C and the second mold die component piece 12C are metal-joined, for example, by a diffusion bonding method.

In addition, when the diffusion bonding method is used for the rust prevention and deposit adhesion prevention processing 16, the processing temperature becomes 600°C to 1000°C, and heat treatment is required after bonding, so heat resistance is required.
For this reason, in the case of plating, hard chrome plating is preferred. Although the composition changes when exposed to heat above 700° C., anti-rust and mold release effects can be expected.
In the case of coating, a TiAlN or AlCrN film containing aluminum and having a high heat resistance is preferable.
Furthermore, in the case of thermal spray coating, there are many coatings that are heat resistant and have releasability, so there are a wide variety of options.

<Method of manufacturing movable mold die part 10A2>
A method for manufacturing the movable mold die part 10A2 according to this embodiment will be described with reference to FIG.

First, a movable mold die part 10A2 that does not include the water channel 13 is created (step S120).
The movable mold die part 10A2 may be produced by a conventional production method or the like.

The movable mold die part 10A2 created in step S120 is subjected to a processing process to form a water channel 13 therein by drilling (step S220).

In step S220, a division process is carried out to divide the movable mold die part 10A2 in which the water channel 13 is formed into a first mold die part piece 11C and a second mold die part piece 12C (step 320).

The inner surface of the water channel 13 formed in the first mold die component piece 11C and the second mold die component piece 12C created in step S320 is subjected to anti-rust and anti-deposit treatment 16 by plating, coating, spray coating, etc. (step S420).

In step S420, the first mold die component piece 11C and the second mold die component piece 12C, which have been treated with the rust prevention and deposit adhesion prevention treatment 16, are treated with a metal cleaner to remove rust prevention oil and markings (marker), and the joint surface 15 is cleaned with an air blower to prevent dust and other particles from adhering thereto (step S520).

First molding die component piece 11C and second molding die component piece 12C that have been degreased and cleaned in step S520 are placed on a pedestal that is set in the diffusion bonding apparatus.
At this time, the first mold die component piece 11C is placed so that one end of the positioning pin is inserted into the positioning pin recess 14a of the second mold die component piece 12C and the other end of the positioning pin is inserted into the positioning pin recess 14a of the first mold die component piece 11C.
Next, the first mold die part piece 11C is positioned so as to remove air from the contact surface between the first mold die part piece 11C and the second mold die part piece 12C, and once they are roughly aligned, a plate-shaped magnet 17 is attached to a flat surface 10W provided on part of the outer side surface of the product outline of the first mold die part piece 11C and the second mold die part piece 12C to align them (step S630).

Next, the first mold die component piece 11C and the second mold die component piece 12C are placed in a diffusion bonding device, and the magnet 17 is removed (step S830).

Then, the first mold die component piece 11C and the second mold die component piece 12C are metal-joined using a diffusion bonding device (step S930).

<Action and Effects>
In the movable mold die part 10A2 of this embodiment, recesses 14a for holding both ends of a positioning pin are provided in the internal center of the first mold die part piece 11C and the second mold die part piece 12C, and in the joining process, the positioning pin is held in the recesses 14a of the first mold die part piece 11C and the second mold die part piece 12C, which have been treated to prevent rust and deposit adhesion, and a plate-shaped magnet 17 is attached to the side spanning the first mold die part piece 11C and the second mold die part piece 12C for positioning, and the parts are integrated by metal joining.
In other words, a positioning pin is held in a recess 14a that holds both ends of the positioning pin provided in the internal center of the first mold die component piece 11C and the second mold die component piece 12C, and a plate-shaped magnet 17 is attached to the side that straddles the first mold die component piece 11C and the second mold die component piece 12C to position them, and they are integrated by metal joining.
Therefore, first molding die part piece 11C and second molding die part piece 12C are joined with high precision, so that water channel 13 is formed without misalignment.
Furthermore, since the water channel 13 is formed without any misalignment, the occurrence of new rust or the like caused by misalignment of the water channel 13 can be reliably prevented.
In addition, since the positioning pins are located inside, the appearance of the product is not marred.
It should be noted that instead of magnets, clamps, jigs, or the like may be used to mechanically hold the substrate in place.

Fourth Embodiment
The movable mold die part 10A3 according to this embodiment will be described below with reference to FIGS.

<Configuration of Movable Mold Die Part 10A3>
As shown in FIG. 9A, a movable mold die part 10A3 according to this embodiment is made up of a first mold die part piece 11D and a second mold die part piece 12D.
As shown in FIG. 9B, first mold die part piece 11D and second mold die part piece 12D have a joining blank area 18 with respect to the product outline.
As shown in FIG. 9(A), a water channel 13 spanning the first mold die component piece 11D and the second mold die component piece 12D is formed in the first mold die component piece 11D and the second mold die component piece 12D, for example, by drilling.
The shape of the water channel 13 is, for example, a hook shape made up of a combination of straight lines, as shown in FIG. 9B.
Also, as shown in Figures 9(A) and 9(B), a through hole 14 is formed in the joining blank area 18 of the movable mold die part 10A3, which penetrates the first mold die part piece 11D and the second mold die part piece 12D and through which a positioning pin is inserted.

As shown in FIG. 4, the inner surface of the water channel 13 formed in the first mold die part piece 11D and the second mold die part piece 12D is treated with a rust-proofing and deposit-proofing treatment 16, which includes plating, coating, and thermal spraying.

After the rust-proofing and deposit-adhesion prevention treatment 16 is applied, the first mold die component piece 11D and the second mold die component piece 12D are metal-joined, for example, by a diffusion bonding method.

In addition, when the diffusion bonding method is used for the rust prevention and deposit adhesion prevention processing 16, the processing temperature becomes 600°C to 1000°C, and heat treatment is required after bonding, so heat resistance is required.
For this reason, in the case of plating, hard chrome plating is preferred. Although the composition changes when exposed to heat above 700° C., anti-rust and mold release effects can be expected.
In the case of coating, a TiAlN or AlCrN film containing aluminum and having a high heat resistance is preferable.
Furthermore, in the case of thermal spray coating, there are many coatings that are heat resistant and have releasability, so there are a wide variety of options.

<Method of manufacturing movable mold die part 10A3>
A method for manufacturing the movable mold die part 10A3 according to this embodiment will be described with reference to FIG.

First, a movable mold die part 10A3 that does not include the water channel 13 is created (step S130).
The movable mold die part 10A3 may be produced by a conventional production method or the like.

The movable mold die part 10A3 created in step S130 is subjected to a processing process to form a water channel 13 therein by drilling (step S230).

In step S230, a division process is carried out to divide the movable mold die part 10A3 in which the water channel 13 is formed into a first mold die part piece 11D and a second mold die part piece 12D (step 330).

The inner surface of the water channel 13 formed in the first mold die component piece 11D and the second mold die component piece 12D created in step S330 is subjected to anti-rust and anti-deposit treatment 16 by plating, coating, spray coating, etc. (step S430).

In step S430, the first mold die component piece 11D and the second mold die component piece 12D, which have been treated with the rust prevention and deposit adhesion prevention treatment 16, are treated with a metal cleaner to remove rust prevention oil and markings (marker), and the joint surface 15 is cleaned with an air blower to prevent dust and other particles from adhering thereto (step S530).

First molding die component piece 11D and second molding die component piece 12D, which have been degreased and cleaned in step S530, are placed on a pedestal that is set in the diffusion bonding apparatus.
At this time, the first molding die part piece 11D is placed on top of the second molding die part piece 12D, with the position shifted.
The position of the positioning pin hole (through hole) 14 is aligned in the same direction.
Next, the first mold die part piece 11D is slid so as to remove air from the contact surface between the first mold die part piece 11D and the second mold die part piece 12D, and once the position is roughly aligned, the position of the positioning pin hole 14 is checked to see if it is aligned and fine adjustments are made. Once aligned, the positioning pin is inserted into the positioning pin hole 14 from the pointed side to align it (step S630).

Then, in step S630, when the positioning is completed, one of the positioning pins that was previously inserted is removed and replaced with a shorter positioning pin, and this operation is repeated for all the positioning pins.
Furthermore, after confirming that the newly inserted short positioning pin is hidden within the positioning pin hole 14, the deviation of the outer shape is adjusted.
The newly inserted positioning pin is not removed, but is sintered during the metal joining process (step S730).

Next, the first mold die component piece 11D and the second mold die component piece 12D are placed in the diffusion bonding device (step S830).

Then, first mold die component piece 11D and second mold die component piece 12D are metallurgically bonded together using a diffusion bonding device (step S930).
Finally, the joining blank area 18 corresponding to the product outline is cut to complete the movable mold die part as the final product.

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In the movable mold die part 10A3 of this embodiment, multiple positioning through holes 14 are provided on the outer side surfaces of the product outline of the first mold die part piece 11D and the second mold die part piece 12D, and in the joining process, positioning pins are inserted into the through holes 14 of the first mold die part piece 11D and the second mold die part piece 12D, which have been treated to prevent rust and deposit adhesion, to position them, and they are integrated by metal joining.
That is, positioning pins are inserted into a plurality of positioning through holes 14 provided on the outer side surfaces of the product outline of first molding die component piece 11D and second molding die component piece 12D to determine position, and metal joining is performed.
Therefore, first molding die part piece 11D and second molding die part piece 12D are joined with high precision, so that water channel 13 is formed without misalignment.
Furthermore, since the water channel 13 is formed without any misalignment, the occurrence of new rust or the like caused by misalignment of the water channel 13 can be reliably prevented.
Furthermore, the joining blank region 18 in which the through hole 14 into which the positioning pin is inserted is formed is scraped off to form the final product, so that the appearance of the product is not marred.

The above describes an embodiment of the present invention in detail with reference to the drawings, but the specific configuration is not limited to this embodiment and includes designs that do not deviate from the gist of the present invention.

1; injection molding machine 10; mold 10A1; movable mold part 10A2; movable mold part 10A3; movable mold part 10A4; movable mold part 10B; fixed mold part 11A; first mold part piece 11B; first mold part piece 11C; first mold part piece 11D; first mold part piece 12A; second mold part piece 12B; second mold part piece 12C; second mold part piece 12D; second mold part piece 13; water tube 14; hole for positioning pin (through hole)
14A: Positioning pin hole (through hole)
14a; recess; 15; joining surface; 16; rust prevention and deposit adhesion prevention treatment; 17; magnet; 18; joining blank area; 20; mold clamping unit; 30; injection unit; 31; hopper; 32; cylinder; 33; motor

Claims (8)

dividing the mold die part into a first mold die part piece and a second mold die part piece;
a water channel forming step of forming water channels in the first mold die piece and the second mold die piece by drilling;
a processing step of performing a rust-proofing and deposit-proofing process on the inner surface of the water channel formed inside the first mold die part piece and the second mold die part piece;
a joining step in which the first mold die part piece and the second mold die part piece that have been subjected to the rust-proofing and deposit adhesion prevention processing in the processing step are positioned by a positioning pin and integrated by metal joining;
A method for manufacturing a mold die part, comprising: a plurality of recesses for holding both ends of the locating pin on the inner periphery of the first mold die piece and the second mold die piece;
The method for manufacturing a mold die part according to claim 1, characterized in that in the joining process, the positioning pin is held in the recesses of the first mold die part piece and the second mold die part piece which have been treated to be rust-proof and to prevent deposit adhesion, and the parts are integrated by metal joining. a positioning through hole is provided in the center of the first mold die piece and the second mold die piece;
The manufacturing method of a mold die part as described in claim 1, characterized in that in the joining process, the positioning pin is inserted into the through hole of the first mold die part piece and the second mold die part piece which have been treated to be rust-proof and deposit-proof, and a plate-shaped magnet is attached to the side straddling the first mold die part piece and the second mold die part piece to position them, and the parts are integrated by metal joining. a recess for holding both ends of the locating pin at a central portion of the interior of the first mold die piece and the second mold die piece;
The method for manufacturing a mold die part as described in claim 1, characterized in that in the joining process, the positioning pin is held in the recesses of the first mold die part piece and the second mold die part piece which have been treated to be rust-proof and deposit-proof, and a plate-shaped magnet is attached to the side straddling the first mold die part piece and the second mold die part piece to position them, and the parts are integrated by metal joining. A plurality of positioning through holes are provided on the outer side surfaces of the product outline of the first mold die piece and the second mold die piece,
The manufacturing method of a mold die part according to claim 1, characterized in that in the joining process, the positioning pin is inserted into the through hole of the first mold die part piece and the second mold die part piece which have been treated to be rust-proof and to prevent deposit adhesion, to position them, and the mold die parts are integrated by metal joining. The method for manufacturing a mold die part according to any one of claims 1 to 5, characterized in that the rust-proofing and deposit adhesion prevention processing is a plating process. The method for manufacturing a mold die part according to any one of claims 1 to 5, characterized in that the rust-proofing and deposit adhesion prevention processing is a coating treatment. The method for manufacturing a mold die part according to any one of claims 1 to 5, characterized in that the rust-proofing and deposit adhesion prevention processing is a thermal spray coating treatment.

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