JPH0890196A - Metal mold for molding fin radiator and fin radiator molding method - Google Patents

Abstract

PURPOSE: To obtain a fin radiator molding method for easily and surely performing a pouring operation with a low pressure by providing the front ends of fin molding holes for forming respective fins with pouring gates and packing a pouring material from the front ends of these fin molding holes through these gates. CONSTITUTION: A base part 20 and a stripper part 21 are integrally built into a stationary metal mold. The fin molding holes are formed between split molds 26 disposed in the central part of this stripper part 21. A cavity part 35 for a radiator base plate and a recessed part 37 for locking are then molded between the base part 20 and the stripper part 21. Next, the molding material consisting of aluminum in a molten state force fed into a longitudinally long hole for admitting the material is admitted and packed through the longitudinally long hole for admitting the material → an annular material inflow hole → the recessed part of an upper press plate 25→ the gates 39 for pouring into the fin holing holes, the cavity part 35 for the radiator base plate and the recessed part 37 for locking. An aluminum alloy, thermoplastic resins, etc., are adequately usable in addition to the material described above as the molding material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fin radiator molding die used for radiating heat from a heat generating portion of a semiconductor element or a small fan, and a fin radiator molding method.

[0002]

2. Description of the Related Art Conventionally, as a radiator provided with a radiation fin used for radiating heat from a heat generating portion of a semiconductor element or a small fan, a large number of pin-shaped radiation fins and thin plate-shaped fins are provided on a radiation substrate. What has been used is being used.

Among them, as a method for forming a heat radiation fin or a heat radiator, as shown in Japanese Patent Laid-Open No. 1-87118, a material having a plurality of rows of parallel grooves is preliminarily formed on a material to be cut and leads having a pitch equivalent to that of the heat radiation fin. There is a groove that crosses the parallel groove with a spiral outer blade tool having a quantity, and there is one that is formed so as to form a fin in the cutout remaining portion, and as shown in JP-A-4-197538. There are those in which radiating fins are protrudingly formed on the surface of the base material by cutting or the like, and the radiating fins are brazed or crimped on many holes provided in the radiating base material to make the pins on the base material Some of them are designed to project.

However, in the above-described pin forming method by cutting or the like, the processing step requires a great deal of time, and since the forming dimension after processing is inaccurate, the dimensional accuracy of the fin size and the pitch between the fins is high. However, there are drawbacks such as that the molding efficiency cannot be made uniform and that it is difficult to accurately process and mold the protruding pin into a cylindrical shape. In the case where high precision is required, such as in the case of making an integrally molded product with, the conventional pin forming method by processing is not suitable.

Therefore, instead of the pin forming by the above-mentioned processing, a method of integrally forming the radiation fin and the radiation substrate with high precision has been considered, for example, cold forging, hot forging, warm forging. A method in which a forging method such as forging and the like are combined with an alkali melting method, a method by injection molding, die casting, or the like have been considered. The molding die C used in these integral molding methods is, for example, as shown in FIG. 21, a lower die 100 for molding a heat radiation substrate of a radiator and a heat radiation fin for molding a radiation fin integrated with the heat radiation substrate. A gate 102, which is composed of a mold 101 and fills the molding space into the molding space, is provided at a required position of the molding die C, and when the radiator is released from the mold after the molding material is cast and solidified. An extruding pin 103 configured to be insertable into an upper die 101 for fin formation pushes the tip end of the heat radiation fin in the releasing direction to release the die.

[0006]

However, in such a molding die C, at the time of casting, the molding material is the gate 102.
Since it flows through the pin root part 104 to the pin tip part 105, it is necessary to cast the molding material at a high pressure to the pin tip part 105 whose diameter is smaller than that of the pin root part 104. Since the mold C has to be made rigid, and high-pressure injection is performed, burrs are liable to occur, releasability is deteriorated, and the push pin 103 is required for each pin. The structure is complicated, and there are certain restrictions on the base diameter, tip diameter, height, etc. of the extrusion pin 103 due to the casting work of the molding material. It is difficult to integrally form the radiation fins, and the molding die C for molding the radiation fins must be provided with a large number of molding holes 106 corresponding to the fins. Therefore, the boring process becomes complicated, Mold C is expensive and various It had drawbacks.

An object of the present invention is to provide a fin radiator molding die and a molding method capable of solving the above problems.

[0008]

According to the present invention, a fin formed by integrally projecting a plurality of heat radiation fins on a heat radiation substrate by a fixed mold and a movable mold is a fin for molding a radiator. The present invention relates to a fin radiator molding die, which is characterized in that a casting gate is provided at the tip of the fin-forming hole of the die on the side to be filled.

The present invention also provides, in the above structure,
A sub-gate is provided on the die on the side where the heat dissipation board is formed, a fin core is attached to the movable die, and the heat dissipation fin is formed by the core, and the fin core is composed of a plurality of split molds. The core unit, and the movable mold is composed of a stripper portion and a base portion that can be joined and separated from each other, and a cavity portion for a heat dissipation substrate is formed on the opposing surface of the stripper portion, and the base portion is opposed. On the surface, a taper-shaped locking concave portion that communicates with the cavitation portion at the time of joining is formed, and after flowing the molding material from the casting gate at the tip of the fin forming hole,
Another feature is that the fixed mold and the movable mold are released from each other, and then the stripper portion and the base portion of the movable mold are separated from each other to be released from each other.

[0010]

According to the present invention, first, the movable mold in which the base portion and the stripper portion are joined is brought into contact with the fixed mold and integrally combined, and the molding material is injected from the solid mold into the stripper portion. A molding material is cast into a fin forming hole formed by a fin core of a stripper portion that constitutes the movable mold from a casting gate provided at the tip of the fin forming hole.
Further, if necessary, the molding material is cast from the sub-gate on the heat dissipation board side. The cast molding material is filled from the fin molding hole formed by the multi-divided core unit or directly from the sub-gate to the heat dissipation board cavity formed on the joining surface of the base of the stripper. The taper locking recess on the joint surface of the base is also filled.

In this state, when the molding material is solidified in the fin molding hole, the heat radiation substrate cavity, and the locking recess, the movable mold is released from the fixed mold,
Next, the stripper part of the movable mold is separated from the base part and released. In this state, the taper-shaped lock body formed by the locking recess supports the finned radiator made up of the radiation substrate and the radiation fins on the base portion, and is molded from the base portion by an appropriate means. By removing the fin radiator, the integral molding work of the fin radiator is completed.

[0012]

【Example】

(Structure of fin radiator) First, regarding the structure of the fin radiator A molded by using the fin radiator molding die B (see FIGS. 5 to 7) according to the present invention, FIGS. A specific description will be made with reference.

As shown in FIGS. 1 to 4, the fin radiator A which can be used for radiating heat from a heat generating portion of a semiconductor element or a small fan is preferably made of aluminum or synthetic resin, and a large number of fin radiators A are provided on the heat radiating substrate 10. The pin-shaped heat radiation fins 11 are integrally planted vertically and horizontally at regular intervals. In this embodiment, nine columns are arranged in a column and nine columns are arranged in a row, and the total number is 81 (9 × 9).

As shown in FIGS. 1 and 2, the heat dissipation board 10 of the fin heatsink A has a large number of heat dissipation fins 11 described above.
A large-diameter board body 10a in which the
It is formed of a small-diameter frustoconical locking projection 10b integrally provided on the back surface of 10a.

As shown in FIG. 2, the locking projection 10b is
In order to hold the fin radiator A on the base portion 20 of the movable mold 19 in the runner breaking step described later,
The diameter gradually increases from the upper base end to the lower end.

(Mold A for fin radiator molding)
The present invention relates to a fin radiator molding die B capable of easily and surely integrally forming the fin radiator A according to the first embodiment. Referring to FIGS. 5 to 14, hereinafter, the fin radiator molding die will be described. The structure of B will be specifically described.

First, the overall structure of the fin radiator molding die B according to this embodiment will be described with reference to FIGS.

In FIG. 5, the fin radiator molding die B is normally installed in a vertical state, but is arranged in a horizontal state for easy description of the structure.

In FIGS. 5 and 8, reference numeral 19 denotes a movable die, which is a base portion 20 movable by a moving device (not shown).
And a stripper portion 21 placed on the upper portion of the base portion 20. A fixed mold 22 is arranged above the movable mold 19.

As shown in FIGS. 5 and 8, the stripper section 21 has a fin radiator A having the structure described with reference to FIGS. 1 to 4 in a core mounting space 23 provided in the center thereof. The fin core 24 capable of molding is attached.

Fin radiator molding die B according to the present embodiment
The main point of the above is that the fin core 24 has a substantially split core structure or split structure.
This will be described in detail with reference to FIG.

First, the overall structure of the fin cores 24 will be described. As shown in FIG. 8, the fin cores 24 are respectively arranged in the core mounting space 23 in a vertically stacked state in the upper core. It comprises a pressing plate 25, a core unit 27 for mounting a split core or split mold 26 described later, and a lower core pressing plate 28.

As shown in FIG. 8, the fin core 24 is attached to the stripper portion 21 on the upper and lower surfaces of the core unit 27 by
The upper and lower core pressing plates are respectively connected by connecting bolts 29.
25, 28 are connected to each other, the core unit 27 is sandwiched between the two holding plates 25, 28, and further, the lower annular flange 27a of the core unit 27 is brought into contact with the annular stepped portion 21a of the stripper section 21 and the connecting bolt 30 is used. It is done by connecting and fixing.

Next, each constituent element of the fin core 24 will be described in detail. As shown in FIGS. 8 to 10, the core unit 27 has a rectangular cross section that penetrates in the vertical direction at the center thereof. The split mold mounting hole 31 is provided, and a plurality of horizontally long rectangular plate-shaped split molds 26 are arranged in the split mold mounting hole 31 in a close contact state.

As shown in FIGS. 10 to 13, each split mold 26 has a semicircular cross section on both sides thereof at regular intervals in the width direction except for the split molds 26 arranged at the left and right ends. The vertical groove 32 is provided in a plurality of rows, and each vertical groove 32 is the fin radiator described above.
It has a radius equal to that of the 10 pin-shaped heat radiation fins 11 over the entire length. Also, the vertical groove 32 provided on one side of each split mold 26,
When mounted in the split mold mounting holes 31, they are aligned with the vertical grooves 32 provided on the opposite side surfaces of the adjacent split molds 26. Therefore, by mounting the plurality of split molds 26 in the split mold mounting holes 31 in close contact with each other, a large number of fin forming holes 33 can be formed in a state of being aligned in the vertical and horizontal directions. In this embodiment, there are nine fin forming holes 33 in the vertical row and nine in the horizontal row.
They are arranged in a rectangular shape, and the total number is 81 (9 × 9).

The vertical groove 32 is not provided on the left and right outer end surfaces of the split mold 26 disposed at the left and right ends.

Further, as shown in FIG. 8, the core unit 27 has bolt insertion holes 34, 34a in its outer peripheral edge portion for inserting the above-mentioned connecting bolts 29, 30.

Next, the structure of the lower core pressing plate 28 arranged below the core unit 27 will be described with reference to FIGS.
As shown in FIGS. 10 and 12, the lower pressing plate 28 is provided with a heat radiation substrate cavity portion 35 having a circular cross section in the center thereof. The heat-radiating substrate cavity portion 35 has its upper opening communicating with the above-described many fin-forming holes 33, and its lower opening, as will be described later with reference to FIG.
It communicates with a lock recess 37 provided in the upper part of the molded product extrusion pin insertion hole 36 provided in the central portion of the base portion 20.

In this embodiment, like the locking recess 37 described later, the heat dissipation substrate cavity 35 also has a frustoconical shape, the diameter of which gradually increases from the upper part to the lower part, and The diameter of the lower end surface is the extrusion pin insertion hole for the molded product
Larger than 36 diameters. With such a configuration, as will be described later, the heat dissipation substrate cavity portion 35 cooperates with the locking recess 37 to move the fin heat radiator 10 through the substrate body 10a when releasing the fin heat radiator 10 after molding. Base part
Since it can be temporarily fixed to 20, the runner R can be easily and surely broken from the radiation fin 11, and only the fin radiator 10 can be placed on the upper surface of the base portion 20.

Next, the structure of the upper core pressing plate 25 arranged above the core unit 27 will be described with reference to FIGS.
As shown in FIGS. 10 and 14, a concave portion 25a is formed in the central portion thereof, and the bottom plate of the concave portion 25a is provided with a large number of upward convex conical small protrusions 38 arranged in a vertically and horizontally connected state. Further, between the bases of the small protrusions 38, a large number of small-diameter casting gates 39 arranged in a vertically and horizontally connected state are formed. In addition, each casting gate 39 has a fin forming hole described above.
It communicates with 33. Therefore, the fin molding hole 33 can be filled with the molding material through the casting gate 39, and the cavity portion for the heat dissipation substrate located below the fin molding hole 33 can be filled.
35 and the locking recess 37 can be filled.

As will be described later, the casting gate 39 has a diameter as small as possible in order to facilitate breakage of the fin radiator 10 from the runner R after molding.

Next, another structure in the illustrated embodiment will be described. As shown in FIG.
Has a molded product extrusion pin insertion hole 36 in the center thereof. A molded product extruding pin 40 is provided in the molded product extruding pin insertion hole 36 so as to be able to move back and forth in the vertical direction, and at the time of molding, the upper end surface 40a of the extruding pin 40 is set to the lower end opening surface of the locking recess 37. The lock recess 37 can be formed in the upper surface of the lock recess 37.

On the other hand, the locking recess 37 has a frustoconical shape, the diameter of which gradually increases from the upper part to the lower part, and the diameter of the lower end surface of the locking recess 37 is made equal to that of the molded product extruding pin insertion hole.
Larger than 36 diameters. With such a configuration, as will be described later, when the fin radiator 10 is released from the mold after being molded, the fin radiator 10 can be temporarily fixed to the base portion 20 via the locking projection 10b, so that the runner R is radiated. The fin 11 can be easily and surely broken, and only the fin radiator 10 can be placed on the upper surface of the base portion 20.

In FIG. 5, 41 is a molded product extruding pin.
Reference numeral 42 denotes a pin mounting plate for fixing and holding the lower end of 40, and 42 denotes a pin extruding plate for moving the molded product extruding pin 40 together with the pin mounting plate 41 so as to be able to move back and forth in the vertical direction.
Are integrally connected to each other by a connecting bolt 43. On the other hand, an upper end of a protruding rod 44 driven by an unillustrated advancing / retreating cylinder or the like is provided on the lower surface of the central portion of the pin pushing plate 42 so as to project.

In FIG. 5, reference numeral 45 is a spring provided between the lower surface of the base portion 20 and the pin mounting plate 41.

Next, a mechanism for moving the stripper portion 21 relative to the base portion 20 in the vertical direction will be described.
As shown in FIGS. 5 and 6, the base portion 20 has the stripper portion advancing / retreating cylinders 46 attached to the four corners thereof, and each cylinder 46 has a pair of nuts at the upper end of the advancing / retreating rod 47 extending upward. It is connected to the stripper part 21 at 48 and 49.

With this configuration, by driving the cylinder 46 for advancing and retracting the stripper portion, the stripper portion 20 can be moved relative to the base portion 20 so that the stripper portion 20 can be moved in and out of contact with each other.

Next, the fin molding hole 33, the heat radiation substrate cavity portion 35, and the material inflow passage for filling the molding material into the locking recess 37 will be described. At the molding position shown in FIG. 22 has a large-diameter sleeve 50 embedded in one side thereof, and a material inflow longitudinal hole 51 is provided in the sleeve 50 in a penetrating state. Further, a frustoconical spool core 52 and a core guide 53 are concentrically arranged below the vertical hole 51 for material inflow, and the top of the spool core 52 is a vertical hole for material inflow. An annular material outflow hole 54 is formed between the outer peripheral surface of the spool core 52 and the lower inner peripheral surface of the vertically elongated material inflow hole 51.

Further, the upper surface of the stripper portion 21 is provided with a material inflow passage 55 for communicating the recess 25a formed on the upper surface of the upper pressing plate 25 and the annular material outflow hole 54.

Therefore, the molding material which has been pressure-fed into the material inflowing longitudinal hole 51 through the pressure-feeding flow path (not shown) has the material inflowing longitudinal hole 51 → the annular material inflow hole 54 → the concave portion 25a of the upper pressing plate 25 → Each fin forming hole 33 through the mold gate 39,
The heat radiating substrate cavity 35 and the locking recess 37 can flow into and fill the cavity.

(Molding Method of Fin Heat Dissipator A Using Fin Heat Dissipator Mold B) Next, the method of molding the fin heat sink A using the fin heat dissipator mold B will be described below. 5, and FIGS. 15 to 18 will be specifically described.

(Step 1) This step relates to injection molding of the fin radiator A.

As shown in FIGS. 5 and 8, the fixed mold 22 is used.
, The base portion 20 and the stripper portion 21 are integrally assembled, and a fin forming hole 33 is formed between the split molds 26 provided in the central portion of the stripper portion 21, and the space between the base portion 20 and the stripper portion 21 is formed. Then, the heat radiation substrate cavity portion 35 and the locking recess portion 37 are molded.

Next, the fin forming hole 33, the heat radiating substrate cavity portion 35, and the locking recess 37 are filled with the molding material made of molten aluminum and pressure-fed into the longitudinal material inflow hole 51. The material inflowing longitudinal hole 51 → the annular material inflowing hole 54 → the concave portion 26a of the upper pressing plate 26 → injection / filling through the casting gate 39.

Although aluminum is used as the molding material here, aluminum alloys, thermoplastic resins and the like can also be suitably used. As the thermoplastic resin, PPS (polyphenylene sulfide), PPO (polyphenylene oxide), PPE (polyphenylene ether), PP (polypropylene) and the like are used.

In such an inflow / filling operation, since the casting gate 39 is provided at the tip of the fin forming hole 33 for forming each radiating fin 11, the fin forming hole is passed through the gate 39.
The casting material can be cast from the tip of 33. Therefore, as compared with the conventional method of casting from the heat dissipation board side, the material can be cast easily and surely at a low pressure, so that the entire device can be manufactured inexpensively and the molding operation can be performed without any trouble. It is expensive, and moreover, the length from the heat dissipation board 10 to the tip of the heat dissipation fin 11 can be formed longer than before,
The fin radiator A having high heat radiation efficiency can be manufactured by integral molding.

(Step 2) This step relates to runner exposure.

After the molding material is hardened in the fin molding hole 33, the heat radiation substrate cavity portion 35, and the locking recess 37, the stripper portion 21 is fixed to the fixed mold 22 as shown in FIG. The base part 20 with the
(In the figure, downward), the runner R is exposed on the stripper portion 21 in conjunction with the same separation movement.

(Step 3) This step relates to runner breakage and molded product demolding.

As shown in FIG. 16, the stripper part advance / retreat cylinder 46 is driven to move the stripper part 21 to the base part 20.
And the fin radiator A as a molded product is exposed on the stripper portion 21 in conjunction with the separation movement (upward in the figure).

At this time, the radiation fin 11 of the fin radiator A
As shown in FIG. 8, since the runner R is connected only to the runner R via the casting gate 39 having a small diameter, the runner R can be easily separated from the fin radiator A by shearing with a slight detaching force. You can Also, the fin radiator A
The locking projection 10b of the above is engaged in the locking recess 37 provided on the upper surface of the base portion 20, and the substrate body 10a is also engaged in the heat dissipation substrate cavity portion 35. As a result, it is possible to reliably prevent the fin radiator A from being separated from the stripper portion 21 integrally without being cut from the runner R, and it is possible to reliably perform the runner breaking action and the molded product demolding work. .

(Step 4) This step relates to removal of runners and demolding of products.

As shown in FIG. 17, the runner removing device (not shown) is driven to remove the runner R from the stripper portion 21, and the projecting rod 44 is projected upward by an unillustrated advancing / retreating cylinder or the like, and is interlocked with the projecting. The molded product extruding pin 40 extends upward in the pin insertion hole 36, and the tip end surface unlocks the fin radiator A and the base portion 20 to project the fin radiator A upward.

Since the fin radiator A is a material molded product and has a certain elasticity, the locking projection 10b can be easily removed from the locking projection molding space 37, and the heat dissipation board 10a can easily dissipate heat. Substrate cavity
You can leave 35.

Thereafter, the fin radiator A placed on the upper end surface of the product extruding pin 40 is removed from the fin radiator molding die B by a desired means to complete the product demolding.

(Step 5) This step relates to the return of the fin radiator molding die B to the molding position.

As shown in FIG. 18, the projecting rod 44 is retracted downward by an unillustrated advancing / retreating cylinder or the like to return to the forming position, and then the stripper part advancing / retreating cylinder 46 is driven to move the stripper part 21 to the base part 20. Integrated with
(Downward in the figure).

After that, an unillustrated advancing / retreating device is driven,
The base part 20 is moved toward the fixed mold 22 and integrated, and the fin radiator molding mold B is put in an assembled state in which the fin radiator A can be molded.

Although the present invention has been specifically described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments shown in the drawings and is not limited to the invention described in the claims. Includes other examples and modifications, and the following examples also form part of the present invention.

As shown in FIG. 19, the core unit 27 and the upper core pressing plate 26 are provided with a fin-forming hole 33 and, in addition to the fin-forming hole 33, an auxiliary material injection hole 60 for forming a heat dissipation substrate, which is a vertically long hole. The diameter of the hole 60 is gradually reduced from the upper end opening to the lower end opening, and a small-diameter subgate 61 is formed in the lower end opening.

Therefore, in the forming operation, the fin forming hole is formed.
In addition to 33, the molding material is passed through the radiation material molding auxiliary material injection hole 60 and the sub-gate 61 so that the radiation material cavity part is formed.
It is possible to fill the holes 37 and the locking recesses 37, and it is possible to shorten the injection time of the molding material of the fin radiator A. At this time, the runner R is torn from the portion of the gate 61.

In the above-described embodiment, the molding material is passed through the pinhole-shaped casting gate 39 and the fin molding hole 33 is formed.
It was made to flow into and fill the inside, but the casting gate 39
Is made up of slits without forming a pinhole shape, and through the slits, flows into and fills each fin forming hole 33 similarly having an elongated rectangular cross section, and has a thin plate shape as shown in FIG. It is also possible to mold the fin radiator A integrally provided with the radiation fin 11.

[0063]

The present invention has the following effects.

A fin formed by integrally projecting a plurality of heat radiation fins on a heat radiation substrate by a fixed mold and a movable mold is used for casting in the fin molding hole tip portion for molding each fin in the radiator molding mold. Since the gate is provided, the casting material can be filled from the tip of the fin forming hole through the gate, compared to the conventional method of casting from the heat dissipation substrate side.
Since the material can be cast easily and reliably with a low pressure, the entire device can be manufactured inexpensively, and the molding operation can be performed without any problems.Furthermore, the length from the heat dissipation board to the tip of the fin can be reduced. Since the fin can be formed longer than before, the fin having high heat dissipation efficiency has an effect that the radiator can be integrally formed.

In addition to the casting gate, a sub-gate is also provided on the die on the side where the heat dissipation board is formed. Therefore, the molding material can be distributed evenly to both the tips of the fins and the heat dissipation board, and the reliability can be ensured. This has the effect that the integral molding work can be performed and the yield of appropriate products can be improved.

Since the fin core for forming the fin forming hole is constituted by a core unit composed of a plurality of split molds, the maintenance of the fin core is facilitated. Even if it remains in
The core unit can be disassembled into split molds to remove the remaining parts of folding,
Further, there is an effect that maintenance, inspection, cleaning and the like in the fin forming hole can be easily performed by disassembling the core unit.

In the stripper portion and the base portion which can be joined and separated from each other, the tapered locking concave portion is formed in the base portion in a state of communicating with the radiating substrate cavitation portion formed in the stripper portion. The radiator can be securely held on the base portion, and the fin radiator can be prevented from being accidentally detached when the stripper portion is released.

[Brief description of drawings]

FIG. 1 is a perspective view of a fin radiator molded using a fin radiator molding die according to the present invention.

FIG. 2 is a partially cutaway front view of the fin radiator.

3 is a cross-sectional view taken along the line I-I of FIG.

FIG. 4 is a bottom view of the same.

FIG. 5 is a sectional front view of the same fin radiator molding die.

6 is a cross-sectional view taken along the line II-II of FIG.

7 is a cross-sectional view taken along the line III-III of FIG.

8 is an enlarged front view of a main part of the fin radiator molding die shown in FIG. 5. FIG.

FIG. 9 is an enlarged plan view of the main part.

FIG. 10 is an exploded perspective view of the relevant part.

FIG. 11 is a front view of the split mold.

FIG. 12 is a plan view of a split mold.

FIG. 13 is a cross-sectional view of a core unit formed by assembling split molds.

FIG. 14 is an enlarged sectional front view of an upper pressing plate.

FIG. 15 is a process explanatory view of the same fin radiator molding method.

FIG. 16 is an explanatory diagram of the same process.

FIG. 17 is an explanatory diagram of the same process.

FIG. 18 is an explanatory diagram of the same process.

FIG. 19 is an explanatory view of a main part structure of another embodiment of the fin radiator molding die according to the present invention.

FIG. 20 is a perspective view of another fin radiator that can be molded by the fin radiator molding die according to the present invention.

FIG. 21 is an explanatory diagram of a conventional fin radiator molding method.

[Explanation of symbols]

 A fin heat sink B fin heat sink molding mold 11 heat dissipation fin 19 movable mold 20 base 21 stripper 22 fixed mold 24 molding core 26 split mold 27 core unit 33 fin molding hole 35 heat dissipation substrate cavity 37 lock Recess 39 Gate for casting 61 Sub gate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B29C 33/42 8823-4F 33/44 8823-4F 45/27 8807-4F 45/40 7639-4F F28F 3/04 // B29L 31:18

Claims (5)

[Claims] 1. A fin radiator molding die in which a plurality of radiating fins are integrally projectingly formed on a radiating board by a fixed die and a movable die, and the fin forming hole tip of the die on the side where each fin is formed. A fin radiator molding die characterized in that a casting gate is provided in a portion thereof. 2. The fin radiator molding die according to claim 1, wherein a sub-gate is provided on the die on the side on which the heat dissipation substrate is molded. 3. The fin radiator molding die according to claim 1 or 2, wherein a fin core is attached to the movable die, and the radiation fin is formed by the core. A fin radiator molding die, characterized in that the core for use is constituted by a core unit composed of a plurality of split molds. 4. The fin radiator molding die according to claim 3, wherein the movable die is composed of a stripper portion and a base portion that can be joined and separated from each other, and the opposing surface of the stripper portion is for a heat dissipation substrate. A fin radiator molding die characterized in that a cavity is formed and a taper-shaped locking recess is formed on the opposing surface of the base portion so as to communicate with the cavitation portion at the time of joining. 5. The fin radiator molding die according to claim 4, wherein the fixed mold and the movable mold are released after filling the molding material from the casting gate at the tip of the fin forming hole. ,
Next, a fin radiator molding method characterized in that the stripper part and the base part of the movable mold are separated from each other and separated from each other.