JP2024059520A - Manufacturing method for die casting mold parts - Google Patents

Abstract

[Problem] To suppress the occurrence of rust inside a water pipe and to suppress the occurrence of deposits of impurities contained in water. [Solution] The method includes a dividing step of dividing a die-casting mold part into a first die-casting mold part piece 11 and a second die-casting mold part piece 12, a water channel forming step of forming water channels by groove processing inside the first die-casting mold part piece 11 and the second die-casting mold part piece 12, a processing step of applying rust-proofing and deposit-proofing processing to the inner surface of the water channel formed inside the first die-casting mold part piece 11 and the second die-casting mold part piece 12, and a joining step of positioning the first die-casting mold part piece 11 and the second die-casting mold part piece 12 that have been treated to be rust-proof and deposit-proof 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 die-casting mold 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 die-casting die parts, water channels are arranged in the die parts that abut against the heat-accumulating portions of the molded product in order to speed up the cooling of the molded product and to speed up the molding cycle.
For this reason, the water channels in typical die-casting mold parts are designed with straight holes drilled from multiple directions to cool the areas that need cooling.
In addition, water is often used for cooling, and is circulated inside the die-casting mold parts using a chiller.

JP 2005-219445 A

After the production of the molded product is completed, the cooling water is drained from the die-casting mold parts and the water in the water passages is removed.
However, it is not possible to completely remove the water from within the waterway, and water tends to remain in some areas, which can lead to rust.

Furthermore, when the rust is severe, it can block part or all of the water passage, making the die-casting mold part unusable thereafter.
Furthermore, impurities contained in the water accumulate in the waterways and, together with rust, cause the waterways to become clogged.

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

Form 1: One or more embodiments of the present invention propose a method for manufacturing a die-casting mold part, comprising: a dividing step of dividing a die-casting mold part into a first die-casting mold part piece and a second die-casting mold part piece; a channel forming step of forming a channel by groove processing inside the divided first die-casting mold part piece and the second die-casting mold part piece in the dividing step; a processing step of applying rust-proofing and deposit adhesion prevention processing to the inner surface of the channel formed inside the first die-casting mold part piece and the second die-casting mold part piece; and a joining step of positioning the first die-casting mold part piece and the second die-casting mold part piece that have been treated to be rust-proof and deposit adhesion prevention 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 die-casting mold parts, characterized in that a plurality of positioning through holes are provided on the outer periphery of the first die-casting mold part piece and the second die-casting mold part piece, and in the joining process, the positioning pins are inserted into the through holes of the first die-casting mold part piece and the second die-casting mold part piece that have been treated to be rust-proof and prevent deposit adhesion, to position them, and the pieces are integrated by metal joining.

Mode 3: One or more embodiments of the present invention propose a method for manufacturing die-casting mold parts, 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 die-casting mold part piece and the second die-casting mold part piece, and in the joining process, the positioning pin is held and positioned in the recesses of the first die-casting mold part piece and the second die-casting mold part piece that have been treated to be rust-proof and prevent deposit adhesion, and the parts are integrated by metal joining.

Mode 4: One or more embodiments of the present invention propose a method for manufacturing die-casting mold parts, in which the first die-casting mold part piece and the second die-casting mold part piece are sized to have a joining blank relative to the product outline, a positioning through hole is provided in the center, and a portion of the outer side surface of the product outline of the first die-casting mold part piece and the second die-casting mold part piece is flat to follow the product outline, and in the joining process, the positioning pin is inserted into the through hole of the first die-casting mold part piece and the second die-casting mold part piece that have been treated to prevent rust and deposit adhesion, a plate-shaped magnet is attached to the flat surface to position it, and the parts are integrated by metal joining.

Mode 5: One or more embodiments of the present invention propose a method for manufacturing die-casting mold parts, characterized in that a recess for holding both ends of the positioning pin is provided in the internal center of the first die-casting mold part piece and the second die-casting mold part piece, a part of the outer side of the product outline of the first die-casting mold part piece and the second die-casting mold part piece is flat, and in the joining process, the positioning pin is held in the recess of the first die-casting mold part piece and the second die-casting mold part piece that have been treated to be rust-proof and prevent deposit adhesion, a plate-shaped magnet is attached to the flat surface to position the parts, and the parts are integrated by metal joining.

Mode 6: One or more embodiments of the present invention propose a method for manufacturing die-casting mold parts, characterized in that a plurality of positioning through holes are provided on the outer side surfaces of the product outline of the first die-casting mold part piece and the second die-casting mold part piece, and in the joining process, the positioning pins are inserted into the through holes of the first die-casting mold part piece and the second die-casting mold part piece that have been treated to be rust-proof and prevent deposit adhesion, to position them, and the pieces are integrated by metal joining.

Embodiment 7: One or more embodiments of the present invention propose a method for manufacturing die-casting mold parts, in which the rust-proofing and deposit-adhesion prevention treatment is a plating treatment.

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

Embodiment 9: One or more embodiments of the present invention propose a method for manufacturing die-casting mold parts, in which the rust-preventing and deposit-adhesion-preventing 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 waterway and to suppress the occurrence of deposits of impurities contained in the water.

FIG. 1 is a diagram showing a schematic configuration of a die-casting molding machine in which a die-casting mold 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 die casting die part according to a first embodiment of the present invention; FIG. 2 is a flow diagram of a manufacturing method of a die-casting die part according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of a water pipe of the die casting die part according to the first embodiment of the present invention. 5A and 5B are a front perspective view, a top plan view, and a front view of a die casting mold part according to a second embodiment of the present invention. FIG. 6 is a flow diagram of a manufacturing method of a die-casting die part according to a second embodiment of the present invention. 13A and 13B are a front perspective view, a top plan view, and a front view of a die casting mold part according to a third embodiment of the present invention. FIG. 11 is a flow diagram of a manufacturing method of a die-casting 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 die casting mold part according to a fourth embodiment of the present invention. FIG. 10 is a flow diagram of a manufacturing method of a die-casting die part according to a fourth embodiment of the present invention. 13A and 13B are a front perspective view, a top plan view, and a front view of a die casting mold part according to a fifth embodiment of the present invention. FIG. 13 is a flow diagram of a manufacturing method of a die-casting die part according to a fifth embodiment of the present invention.

<Embodiment>
Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 to FIG.

<Die casting>
Die casting is a type of metal mold casting method that is suitable for mass-producing castings with high dimensional accuracy in a short period of time by forcing molten metal (molten alloy) into a metal mold.
Die casting is suitable for mass-producing high-precision castings in a short period of time.
The die casting process is broadly divided into seven steps: application of release agent and lubricant, clamping the mold, pouring molten metal, injection/filling, pressure holding, mold opening, and demolding/removal.

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

Generally, there are two types of die casting machines: cold chamber die casting machines and hot chamber die casting machines. Here, the cold chamber die casting machine will be taken as an example for explanation.
As shown in FIG. 1 , a die casting machine 1 according to this embodiment includes a die casting mold 10 , a mold clamping unit 20 , and an injection unit 30 .

The injection unit 30 also includes an injection sleeve 31, an injection plunger 32, and an injection cylinder 33.

The mold clamping unit 20 opens, closes, and ejects the die-casting 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.
In the first process, the release agent/lubricant application process, a release agent/lubricant is applied to the mold molding portion (cavity) before the mold is closed by the mold clamping unit 20, improving the releasability of the filled and solidified metal.

The injection unit 30 injects heated and melted metal (molten metal) into the mold.
Then, a measured amount of molten metal is poured into the injection sleeve 31, and the injection plunger 32 is moved toward the mold at high speed by the injection cylinder 33, thereby filling the mold with molten metal in a short period of time, and the molten metal, which solidifies quickly within the mold, is filled into the mold.
Once filling is complete, the mold is kept closed and pressure is maintained until the temperature reaches a point where the molded product can be removed, and then the mold is opened once the molded product has solidified.

The die-casting mold 10 is a metal mold into which molten metal is injected to form a specific shape, and is composed of a movable die-casting mold part 10A and a fixed die-casting mold part 10B.

The movable die-casting mold part 10A is movable by the mold clamping unit 20.
A water passage (not shown) is formed inside the movable die-casting mold part 10A, and a cooling medium circulates through the water passage so that the mold temperature is maintained at about half the pouring temperature of the molten metal.
In other words, if the mold temperature is too low, the flow of molten metal will be reduced and water will remain (the release agent will not dry and moisture will remain), making it more likely for casting cavities to occur, while if the mold temperature is too high, the release agent will not adhere well and seizure will occur, so the mold temperature is designed to be at an appropriate level.

The molten metal enters the die casting mold 10 from the injection sleeve 31, passes through a runner gate (not shown), and fills the cavity (not shown).
Then, after a pressure holding step, the die casting die 10 is opened and an ejector plate (not shown) of the die casting die 10 is pushed by an ejector rod (not shown) of the molding machine to eject the molded product.

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

<Configuration of movable die-casting mold part 10A>
As shown in FIG. 2A, a movable die-casting mold part 10A according to this embodiment is composed of a first die-casting mold part piece 11 and a second die-casting mold part piece 12.
As shown in FIG. 2(A), a water channel 13 spanning the first die-casting mold piece 11 and the second die-casting mold piece 12 is formed in the first die-casting mold piece 11 and the second die-casting mold piece 12, for example, by groove processing.
As shown in FIG. 2B, the shape of the water channels 13 is, for example, a combination of a straight line and a semicircle, and the water channels 13 are formed so as to face each other at the center.
Also, as shown in Figures 2(A) to 2(C), a through hole 14 is formed between the outer edge of the movable die-casting mold part 10A and the outer edge of the water channel, which penetrates the first die-casting mold part piece 11 and the second die-casting mold part piece 12 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 die-casting mold part piece 11 and the second die-casting mold part piece 12 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 die-casting mold part piece 11 and the second die-casting mold part piece 12 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.

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

First, a first die-casting mold part piece 11 not including a water passage 13 and a second die-casting mold part piece 12 are prepared (step S100).
In addition, preparation of the first die-casting mold part piece 11 and the second die-casting mold part piece 12 includes, for example, preparing two separate first die-casting mold part pieces 11 and the second die-casting mold part piece 12, and dividing the final product outer shape of the movable die-casting mold part 10A or a metal block similar thereto, to prepare two separate first die-casting mold part pieces 11 and the second die-casting mold part piece 12.

The first die-casting mold part piece 11 and the second die-casting mold part piece 12 prepared in step S100 are subjected to a processing process to form a water channel 13 therein by groove processing (step S200).

The inner surface of the water channel 13 formed in the first die-casting mold part piece 11 and the second die-casting mold part piece 12 created in step S200 is subjected to anti-rust and anti-deposit treatment 16 by plating, coating, spray coating, etc. (step S300).

In step S300, the first die-casting mold part piece 11 and the second die-casting mold part piece 12, 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 shown in Figure 4 is cleaned with an air blower to prevent dust and other particles from adhering thereto (step S400).

The first die-casting mold component piece 11 and the second die-casting mold component piece 12, which have been degreased and cleaned in step S400, are placed on a pedestal to be set in the diffusion bonding apparatus.
At this time, the first die casting mold part piece 11 is placed on top of the second die casting mold part piece 12 with their positions shifted.
The position of the positioning pin hole (through hole) 14 is aligned in the same direction.
Next, the first die-casting mold part piece 11 is slid so as to remove air from the contact surface between the first die-casting mold part piece 11 and the second die-casting mold part piece 12, 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 with the pointed side of the pin first to align it (step S500).

Then, in step S500, when the positioning is completed, one of the positioning pins that was previously inserted is removed and replaced with a shorter pin, and this operation is carried out for all the positioning pins.
Furthermore, after confirming that the newly inserted short positioning pin is hidden within the positioning pin hole 14, any deviation in the external shape is adjusted.
The newly inserted positioning pin is not removed, but is sintered during the metal joining process (step S600).

Next, the first die-casting mold component piece 11 and the second die-casting mold component piece 12 are placed in the diffusion bonding device (step S700).

Then, the first die-casting mold part piece 11 and the second die-casting mold part piece 12 are metal-joined using a diffusion bonding device to produce the movable die-casting mold part 10A (step S800).

<Action and Effects>
The movable die-casting mold part 10A according to this embodiment is formed by dividing the die-casting mold part into a first die-casting mold piece 11 and a second die-casting mold piece 12, and forming a water channel 13 by groove processing inside the first die-casting mold piece 11 and the second die-casting mold piece 12. Then, the inner surface of the water channel 13 formed inside the first die-casting mold piece 11 and the second die-casting mold piece 12 is subjected to rust prevention and deposit adhesion prevention processing, and the first die-casting mold piece 11 and the second die-casting mold piece 12 are positioned by positioning pins and integrated by metal joining.
In other words, the movable die-casting mold part 10A is divided into a first die-casting mold part piece 11 and a second die-casting mold part piece 12, and water channels 13 are formed inside the first die-casting mold part piece 11 and the second die-casting mold part piece 12 by groove processing, and the inner surfaces of the water channels 13 formed inside the first die-casting mold part piece 11 and the second die-casting mold part piece 12 are treated to prevent rust and deposit adhesion.
Therefore, the rust-proofing and deposit-preventing processing 16, which involves plating, coating, or thermal spraying, can be carried out accurately and easily.
In addition, the two separated members (first die-casting mold component piece 11 and second die-casting mold component piece 12) are integrated by metal joining.
Therefore, it is possible to manufacture a movable die-casting mold part 10A having a water channel 13 formed therein that has been appropriately treated with anti-rust and anti-deposit adhesion processing 16, such as plating, coating, or thermal spraying.
This makes it possible to obtain die-casting mold parts that suppress the occurrence of rust inside the water passage 13 and also suppress the occurrence of deposits of impurity components contained in the water.
In addition, in the movable die-casting mold part 10A of this embodiment, a plurality of positioning through holes 14 are provided on the outer periphery of the first die-casting mold part piece 11 and the second die-casting mold part piece 12, and in the joining process, positioning pins are inserted into the through holes 14 of the first die-casting mold part piece 11 and the second die-casting mold part piece 12, which have been treated to prevent rust and deposit adhesion, to position them, and they are integrated by metal joining.
In other words, since metal joining is performed with positioning pins inserted into positioning through holes 14 provided on the outer periphery of the first die-casting mold component piece 11 and the second die-casting mold component piece 12, the first die-casting mold component piece 11 and the second die-casting mold component piece 12 are joined with high precision, and the 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, in the movable die-casting mold part 10A according to this embodiment, the water passage 13 is formed by groove processing.
Therefore, water channels of various shapes, including curved lines, can be formed inside the die casting mold parts.
The inner surface of the water channel 13 formed by groove machining 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 die-casting mold part 10A according to this embodiment, the water passage 13 formed therein is subjected to anti-rust and anti-deposit treatment 16, which involves plating, coating or spraying a film.
Therefore, it is possible to obtain a movable die-casting mold part 10A that suppresses the occurrence of rust inside the water passage 13 and also suppresses the occurrence of deposits of impurity components contained in the water.

In addition, the movable die-casting mold 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 channel 13 formed by groove machining has surface roughness, but this surface roughness is treated by plating.
Therefore, it is possible to obtain a movable die-casting mold part 10A that suppresses the occurrence of rust inside the water passage 13 and also suppresses the occurrence of deposits of impurity components contained in the water.

In addition, the movable die-casting mold part 10A according to this embodiment is subjected to anti-rust and anti-deposit treatment 16 by a coating process.
That is, the inner surface of the water channel 13 formed by groove machining has surface roughness, but this surface roughness is treated with a coating.
Therefore, it is possible to obtain a movable die-casting mold part 10A that suppresses the occurrence of rust inside the water passage 13 and also suppresses the occurrence of deposits of impurity components contained in the water.

In addition, the movable die-casting mold part 10A according to this embodiment has anti-rust and anti-deposit treatment 16 performed by thermal spraying film treatment.
That is, the inner surface of the water channel 13 formed by groove machining has surface roughness, but this surface roughness is treated with a thermal spray coating.
Therefore, it is possible to obtain a movable die-casting mold part 10A that suppresses the occurrence of rust inside the water passage 13 and also suppresses the occurrence of deposits of impurity components contained in the water.

In addition, the first die-casting mold component piece 11 and the second die-casting mold component 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 die casting mold part 10A, which requires strength.

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

<Configuration of Movable Die-Casting Mold Part 10A1>
As shown in FIG. 5A, a movable die-casting mold part 10A1 according to this embodiment is composed of a first die-casting mold part piece 11A and a second die-casting mold part piece 12A.
As shown in FIG. 5(A), a water channel 13 spanning the first die-casting mold piece 11A and the second die-casting mold piece 12A is formed in the first die-casting mold piece 11A and the second die-casting mold piece 12A, for example, by groove processing.
As shown in FIG. 5B, the shape of the water channels 13 is, for example, a combination of a straight line and a semicircle, and the water channels 13 are formed so as to face each other at the center.
Also, as shown in FIG. 5(C), between the outer edge of the movable die-casting mold part 10A and the outer edge of the water channel, recesses 14a for holding positioning pins are formed in both the first die-casting mold part piece 11A and the second die-casting mold part piece 12A.

As shown in FIG. 4, the inner surface of the water channel 13 formed in the first die-casting mold part piece 11A and the second die-casting mold 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 die-casting mold part piece 11A and the second die-casting mold part 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.

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

First, a first die-casting mold part piece 11A not including a water passage 13 and a second die-casting mold part piece 12A are prepared (step S110).
In addition, preparation of the first die-casting mold part piece 11A and the second die-casting mold part piece 12A includes, for example, preparing two separate first die-casting mold part pieces 11A and the second die-casting mold part piece 12A, and dividing the final product outer shape of the movable die-casting mold part 10A1 or a metal block similar thereto, to prepare two separate first die-casting mold part pieces 11A and the second die-casting mold part piece 12A.

The first die-casting mold part piece 11A and the second die-casting mold part piece 12A prepared in step S110 are subjected to a processing process to form a water channel 13 therein by groove processing (step S210).

The inner surface of the water channel 13 formed in the first die-casting mold part piece 11A and the second die-casting mold part piece 12A created in step S210 is subjected to anti-rust and anti-deposit treatment 16 by plating, coating, spray coating, etc. (step S310).

In step S310, the first die-casting mold part piece 11A and the second die-casting mold part 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 S410).

The first die-casting mold component piece 11A and the second die-casting mold component piece 12A that have been degreased and cleaned in step S410 are placed on a pedestal that is set in the diffusion bonding apparatus.
At this time, the first die-casting mold 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 die-casting mold component piece 12A and the other end of the positioning pin is inserted into the two positioning pin recesses 14a of the first die-casting mold component piece 11A.
Next, the first die-casting mold part piece 11A is positioned so as to remove air from the contact surface between the first die-casting mold part piece 11A and the second die-casting mold part piece 12A (step S510).

Next, the first die-casting mold component piece 11A and the second die-casting mold component piece 12A are placed in the diffusion bonding device (step S710).

Then, the first die-casting mold part piece 11A and the second die-casting mold part piece 12A are metal-joined using a diffusion bonding device to produce the movable die-casting mold part 10A1 (step S810).

<Action and Effects>
In the movable die-casting mold part 10A1 of this embodiment, multiple recesses 14a that hold both ends of a positioning pin are provided on the inner outer periphery of the first die-casting mold part piece 11A and the second die-casting mold part piece 12A, and in the joining process, the positioning pin is held and positioned in the recesses 14a of the first die-casting mold part piece 11A and the second die-casting mold part piece 12A, which have been treated to prevent rust and deposit adhesion, and the pieces 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 the first die-casting mold component piece 11A and the second die-casting mold component piece 12A and hold the positioning pins, so that the first die-casting mold component piece 11A and the second die-casting mold component piece 12A are joined with high precision, and the water channel 13 is formed without any 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.

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

<Configuration of Movable Die-Casting Mold Part 10A2>
As shown in FIG. 7A, a movable die-casting mold part 10A2 according to this embodiment is composed of a first die-casting mold part piece 11B and a second die-casting mold part piece 12B.
As shown in Figure 7 (B), the first die-casting mold part piece 11B and the second die-casting mold part piece 12B are one size larger than the product outline, with a joining blank area 18, and a portion of the outer side surface of the product outline is a plane 10W that follows the product outline.
As shown in Figure 7 (A), a water channel 13 spanning the first die-casting mold component piece 11B and the second die-casting mold component piece 12B is formed in the first die-casting mold component piece 11B and the second die-casting mold component piece 12B, for example, by groove processing.
As shown in FIG. 7B, the shape of the water channels 13 is, for example, a combination of a straight line and a semicircle, and the water channels 13 are formed so as to face each other at the center.
Also, as shown in FIG. 7(C), a through hole 14B is formed in the center of the movable die-casting mold part 10A2, which penetrates the first die-casting mold part piece 11B and the second die-casting mold part piece 12B 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 die-casting mold part piece 11B and the second die-casting mold part piece 12B is treated with a rust-proofing and deposit-preventing treatment 16, such as plating, coating, or thermal spraying.

After the rust-proofing and deposit-adhesion prevention treatment 16 is applied, the first die-casting mold part piece 11B and the second die-casting mold part 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.

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

First, a first die-casting mold part piece 11B not including a water passage 13 and a second die-casting mold part piece 12B are prepared (step S120).
In addition, preparation of the first die-casting mold part piece 11B and the second die-casting mold part piece 12B includes, for example, preparing two separate first die-casting mold part pieces 11B and the second die-casting mold part piece 12B, and dividing the final product outer shape of the movable die-casting mold part 10A2 or a metal lump similar thereto, and preparing two separate first die-casting mold part pieces 11B and the second die-casting mold part piece 12B.

The first die-casting mold part piece 11B and the second die-casting mold part piece 12B prepared in step S120 are subjected to a processing process to form a water channel 13 therein by groove processing (step S220).

The inner surface of the water channel 13 formed in the first die-casting mold part piece 11B and the second die-casting mold part piece 12B created in step S220 is subjected to anti-rust and deposit adhesion prevention processing 16 by plating, coating, spray coating, etc. (step S320).

In step S320, the first die-casting mold part piece 11B and the second die-casting mold part piece 12B, 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 S420).

The first die-casting mold component piece 11B and the second die-casting mold component piece 12B that have been degreased and cleaned in step S420 are placed on a base that is set in the diffusion bonding apparatus.
At this time, the first die casting mold part piece 11B is placed on top of the second die casting mold part piece 12B, with the position shifted.
The position of the positioning pin hole (through hole) 14B is adjusted in the same direction.
Next, the first die-casting mold part piece 11B is slid so as to remove air from the contact surface between the first die-casting mold part piece 11B and the second die-casting mold part piece 12B. Once the position is roughly aligned, the position of the positioning pin hole 14B is checked to ensure that it is aligned and fine adjustments are made. Once aligned, the positioning pin is inserted into the positioning pin hole 14B from the pointed side of the positioning pin. Furthermore, positioning is performed by attaching a plate-shaped magnet 17 to a flat surface 10W provided on part of the outer side of the product outline of the first die-casting mold part piece 11B and the second die-casting mold part piece 12B (step S520).

Then, in step S520, 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 S610).

Next, the first die-casting mold part piece 11B and the second die-casting mold part piece 12B are placed in a diffusion bonding device, and the magnet 17 is removed (step S720).

Then, the first die-casting mold component piece 11 and the second die-casting mold component piece 12 are metallically joined together by a diffusion bonding device (step S820).
Finally, the joining blank area 18 corresponding to the product outline is cut out to produce the movable die casting mold part 10A2.

<Action and Effects>
In the movable die-casting mold part 10A2 of this embodiment, the first die-casting mold part piece 11B and the second die-casting mold part piece 12B are sized to have a joining blank area 18 relative to the product outline, a positioning through hole 14B is provided in the center, and a portion of the outer side surface of the product outline of the first die-casting mold part piece 11B and the second die-casting mold part piece 12B is a plane 10W that follows the product outline. In the joining process, a positioning pin is inserted into the through hole 14B of the first die-casting mold part piece 11B and the second die-casting mold part piece 12B, which have been treated to prevent rust and deposit adhesion, and a plate-shaped magnet 17 is attached to the plane 10W to position it, and the parts are integrated by metal joining.
In other words, a positioning pin is inserted into a through hole 14B provided in the center of the first die-casting mold part piece 11B and the second die-casting mold part piece 12B, and 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 die-casting mold part piece 11B and the second die-casting mold part piece 12B to position them, and metal joining is performed, so that the first die-casting mold part piece 11A and the second die-casting mold part piece 12A are joined with high precision and the water channel 13 is formed without any 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.

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

<Configuration of movable die-casting mold part 10A3>
As shown in FIG. 9A, a movable die-casting mold part 10A3 according to this embodiment is composed of a first die-casting mold part piece 11C and a second die-casting mold part piece 12C.
As shown in Figure 9 (B), the first die-casting mold part piece 11C and the second die-casting mold part piece 12C are one size larger than the product outline, with a joining blank area 18, and a portion of the outer side surface of the product outline is a plane 10W that follows the product outline.
As shown in Figure 9 (A), a water channel 13 spanning the first die-casting mold component piece 11C and the second die-casting mold component piece 12C is formed in the first die-casting mold component piece 11C and the second die-casting mold component piece 12C, for example, by groove processing.
As shown in FIG. 9B, the shape of the water channels 13 is, for example, a combination of a straight line and a semicircle, and the water channels 13 are formed so as to face each other at the center.
Also, as shown in FIG. 9(C), in the center of the movable die-casting mold part 10A3, recesses 14a for holding positioning pins are formed in both the first die-casting mold part piece 11C and the second die-casting mold part piece 12C.

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

After the rust-proofing and deposit-adhesion prevention treatment 16 is applied, the first die-casting mold part piece 11C and the second die-casting mold part 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.

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

First, a first die-casting mold part piece 11C not including a water passage 13 and a second die-casting mold part piece 12C are prepared (step S130).
In addition, preparation of the first die-casting mold part piece 11C and the second die-casting mold part piece 12C includes, for example, preparing two separate first die-casting mold part pieces 11C and the second die-casting mold part piece 12C, and dividing the final product outer shape of the movable die-casting mold part 10A3 or a metal block similar thereto, to prepare two separate first die-casting mold part pieces 11C and the second die-casting mold part piece 12C.

The first die-casting mold part piece 11C and the second die-casting mold part piece 12C prepared in step S130 are subjected to a processing process to form a water channel 13 therein by groove processing (step S230).

The inner surface of the water channel 13 formed in the first die-casting mold part piece 11C and the second die-casting mold part piece 12C created in step S230 is subjected to anti-rust and anti-deposit treatment 16 by plating, coating, spray coating, etc. (step S330).

In step S330, the first die-casting mold part piece 11C and the second die-casting mold part piece 12C, 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 S430).

The first die-casting mold component piece 11C and the second die-casting mold component piece 12C that have been degreased and cleaned in step S430 are placed on a base that is set in the diffusion bonding apparatus.
At this time, one end of the positioning pin is inserted into the positioning pin recess 14a of the second die-casting mold part piece 12C, and the first die-casting mold part piece 11C is placed so that the other end of the positioning pin is inserted into the positioning pin recess 14a of the first die-casting mold part piece 11C.
Next, the first die-casting mold part piece 11C is positioned so as to remove air from the contact surface between the first die-casting mold part piece 11C and the second die-casting mold part piece 12C, and once it is 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 die-casting mold part piece 11C and the second die-casting mold part piece 12C to align them (step S530).

Next, the first die-casting mold part piece 11C and the second die-casting mold part piece 12C are placed in a diffusion bonding device, and the magnet 17 is removed (step S730).

Then, the first die-casting mold component piece 11C and the second die-casting mold component piece 12C are metallically joined together by a diffusion bonding device (step S830).
Finally, the joining blank area 18 corresponding to the product outline is cut out to produce the movable die casting mold part 10A3.

<Action and Effects>
In the movable die-casting mold part 10A3 of this embodiment, a recess 14a for holding both ends of a positioning pin is provided in the internal center of the first die-casting mold part piece 11C and the second die-casting mold part piece 12C, and a portion of the outer side surface of the product outline of the first die-casting mold part piece 11C and the second die-casting mold part piece 12C is a flat surface 10W. In the joining process, the positioning pin is held in the recess 14a of the first die-casting mold part piece 11C and the second die-casting mold part piece 12C, which have been treated to prevent rust and deposit adhesion, and a plate-shaped magnet 17 is attached to the flat surface 10W for positioning, and the parts are integrated by metal joining.
In other words, the positioning pin is held in the recess 14a that holds both ends of the positioning pin provided in the internal center of the first die-casting mold part piece 11C and the second die-casting mold part piece 12C, and 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 die-casting mold part piece 11C and the second die-casting mold part piece 12C for positioning, and metal joining is performed, so that the first die-casting mold part piece 11C and the second die-casting mold part piece 12C are joined with high precision, and the water channel 13 is formed without any 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.

Fifth embodiment
The movable die-casting mold part 10A4 according to this embodiment will be described below with reference to FIGS.

<Configuration of movable die-casting mold part 10A4>
As shown in FIG. 11A, a movable die-casting mold part 10A4 according to this embodiment is composed of a first die-casting mold part piece 11D and a second die-casting mold part piece 12D.
As shown in FIG. 11B, the first die-casting mold part piece 11D and the second die-casting mold part piece 12D are sized to have a joining blank area 18 with respect to the product outer shape.
As shown in FIG. 11(A), a water channel 13 spanning the first die-casting mold component piece 11D and the second die-casting mold component piece 12D is formed in the first die-casting mold component piece 11D and the second die-casting mold component piece 12D, for example, by groove processing.
As shown in FIG. 11B, the shape of the water channels 13 is, for example, a combination of a straight line and a semicircle, and the water channels 13 are formed so as to face each other at the center.
Also, as shown in Figures 11(A) and 11(B), a through hole 14 is formed between the product outline and the main body outline of the movable die-casting mold part 10A4, which penetrates the first die-casting mold part piece 11D and the second die-casting mold 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 die-casting mold part piece 11D and the second die-casting mold part piece 12D is treated with a rust-proofing and deposit-preventing treatment 16, such as plating, coating, or thermal spraying.

After the rust-proofing and deposit-adhesion prevention treatment 16 is applied, the first die-casting mold part piece 11D and the second die-casting mold part 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.

<Manufacturing method of movable die-casting mold part 10A4>
A manufacturing method of the movable die-casting mold part 10A4 according to this embodiment will be described with reference to FIG.

First, a first die-casting mold part piece 11D not including a water passage 13 and a second die-casting mold part piece 12d are prepared (step S140).
In addition, preparation of the first die-casting mold part piece 11D and the second die-casting mold part piece 12D includes, for example, preparing two separate first die-casting mold part pieces 11D and the second die-casting mold part piece 12D, and dividing the final product outer shape of the movable die-casting mold part 10A4 or a metal block similar thereto, to prepare two separate first die-casting mold part pieces 11D and the second die-casting mold part piece 12D.

The first die-casting mold part piece 11D and the second die-casting mold part piece 12D prepared in step S140 are subjected to a processing process to form a water channel 13 therein by groove processing (step S240).

The inner surface of the water channel 13 formed in the first die-casting mold part piece 11D and the second die-casting mold part piece 12D created in step S240 is subjected to anti-rust and anti-deposit treatment 16 by plating, coating, spray coating, etc. (step S340).

In step S340, the first die-casting mold part piece 11D and the second die-casting mold part piece 12D, 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 S440).

The first die-casting mold component piece 11D and the second die-casting mold component piece 12D that have been degreased and cleaned in step S440 are placed on a base that is set in the diffusion bonding apparatus.
At this time, the first die casting mold part piece 11D is placed on top of the second die casting mold part piece 12D, with their positions shifted.
The position of the positioning pin hole (through hole) 14 is aligned in the same direction.
Next, the first die-casting mold part piece 11D is slid so as to remove air from the contact surface between the first die-casting mold part piece 11D and the second die-casting mold 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 S540).

Then, in step S540, 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 S620).

Next, the first die-casting mold component piece 11D and the second die-casting mold component piece 12D are placed in the diffusion bonding device (step S740).

Then, the first die-casting mold component piece 11D and the second die-casting mold component piece 12D are metallically bonded together using a diffusion bonding device (step S840).
Finally, the joining blank area 18 corresponding to the product outer shape is cut to complete the movable die casting mold part as the final product.

<Action and Effects>
In the movable die-casting mold part 10A4 of this embodiment, multiple positioning through holes 14 are provided on the outer side surfaces of the product outline of the first die-casting mold part piece 11D and the second die-casting mold part piece 12D, and in the joining process, positioning pins are inserted into the through holes 14 of the first die-casting mold part piece 11D and the second die-casting mold part piece 12D, which have been treated to prevent rust and deposit adhesion, to position them, and they are integrated by metal joining.
In other words, positioning pins are inserted into multiple positioning through holes 14 provided on the outer side surfaces of the product outline of the first die-casting mold part piece 11D and the second die-casting mold part piece 12D to determine position, and metal joining is performed.As a result, the first die-casting mold part piece 11D and the second die-casting mold part piece 12D are joined with high precision, and the water channel 13 is formed without any 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 10A; movable die-casting mold part 10A1; movable die-casting mold part 10A2; movable die-casting mold part 10A3; movable die-casting mold part 10A4; movable die-casting mold part 10B; fixed die-casting mold part 10W; plane 11; first die-casting mold part piece 11A; first die-casting mold part piece 11B; first die-casting mold part piece 11C; first die-casting mold part piece 11D; first die-casting mold part piece 12; second die-casting mold part piece 12A; second die-casting mold part piece 12B; second die-casting mold part piece 12C; second die-casting mold part piece 12D; second die-casting mold part piece 13; water tube 14; hole for positioning pin (through hole)
14A: Positioning pin hole (through hole)
14B: Positioning pin hole (through hole)
14a; recess 15; joint surface 16; rust prevention and deposit adhesion prevention treatment 17; magnet 20; mold clamping unit 30; injection unit 31; hopper 32; cylinder 33; motor

Claims (9)

a dividing step of dividing the die casting mold part into a first die casting mold part piece and a second die casting mold part piece;
a water channel forming step of forming a water channel by groove processing inside the first die casting mold part piece and the second die casting mold part piece;
a processing step of performing a rust-proofing and deposit-proofing process on the inner surface of the water channel formed inside the first die-casting mold part piece and the second die-casting mold part piece;
a joining step in which the first die-casting mold part piece and the second die-casting mold 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 die-casting die part, comprising: A plurality of positioning through holes are provided on the outer periphery of the first die-casting mold piece and the second die-casting mold piece,
The manufacturing method of the die-casting mold part according to claim 1, characterized in that in the joining process, the positioning pin is inserted into the through holes of the first die-casting mold part piece and the second die-casting mold part piece which have been treated to be rust-proof and to prevent deposit adhesion, to position them, and the pieces are integrated by metal joining. a plurality of recesses for holding both ends of the positioning pin on the inner periphery of the first die-casting mold piece and the second die-casting mold piece;
2. The method for manufacturing a die-casting 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 die-casting die part piece and the second die-casting die part piece which have been treated to be rust-proof and deposit-proof, and the pieces are integrated by metal joining. The first die-casting mold piece and the second die-casting mold piece are sized to have a joining blank area with respect to the product outer shape, and a positioning through hole is provided in the center, and a part of the outer side surface of the product outer shape of the first die-casting mold piece and the second die-casting mold piece is a flat surface that follows the product outer shape,
The manufacturing method of the die-casting mold part according to claim 1, characterized in that in the joining process, the positioning pin is inserted into the through hole of the first die-casting mold part piece and the second die-casting mold part piece which have been treated to be rust-proof and deposit-proof, a plate-shaped magnet is attached to the flat surface to position them, and the parts are integrated by metal joining. A recess is provided in the inner center of each of the first die-casting mold piece and the second die-casting mold piece to hold both ends of the positioning pin, and a part of the outer side surface of the product outline of each of the first die-casting mold piece and the second die-casting mold piece is flat,
2. A manufacturing method for die-casting die parts as described in claim 1, characterized in that in the joining process, the positioning pin is held in the recesses of the first die-casting die part piece and the second die-casting die part piece which have been treated to be rust-proof and deposit-proof, a plate-shaped magnet is attached to the flat surface to position them, and the parts are integrated by metal joining. A plurality of positioning through holes are provided on outer side surfaces of the product outline of the first die-casting mold part piece and the second die-casting mold part piece,
The manufacturing method of the die-casting mold part according to claim 1, characterized in that in the joining process, the positioning pin is inserted into the through holes of the first die-casting mold part piece and the second die-casting mold part piece which have been treated to be rust-proof and to prevent deposit adhesion, to position them, and the pieces are integrated by metal joining. The method for manufacturing die-casting mold parts according to any one of claims 1 to 6, characterized in that the rust-proofing and deposit-proofing treatment is a plating treatment. The method for manufacturing die-casting mold parts according to any one of claims 1 to 6, characterized in that the rust-proofing and deposit adhesion prevention processing is a coating treatment. The method for manufacturing die-casting mold parts according to any one of claims 1 to 6, characterized in that the rust-proofing and deposit adhesion prevention processing is a thermal spray coating treatment.

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