JPH09168855A - Method and apparatus for manufacturing resin molding die - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To manufacture a highly accurate die made of a composite material with excellent durability, and also to improve efficiency and simplification of the entire manufacturing operation. SOLUTION: An FC frame 12 which is an upper mold and a sand mold 14 which is a lower mold are provided, and a cavity 16 is formed between the FC frame 12 and the sand mold 14 and the FC frame 12 is provided.
The feeder 18 is directly provided in the. FC frame 12 and sand mold 14
With the mold clamped, the molten aluminum alloy 15 is poured from the sprue 34 into the runner 36, the aluminum alloy 15 is supplied to the cavity 16 by a predetermined amount, and then the feeder 18
The molten aluminum alloy 15 is replenished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a resin molding die integrally including a cast iron reinforcing die portion and an aluminum alloy layer.

[0002]

2. Description of the Related Art In general, various molding methods such as injection molding, compression molding, blow molding and the like are employed to obtain a resin molded product using a synthetic resin material. It is desired that the mold used in this type of molding method has excellent durability for mass production and can easily transfer a complicated shape.

Therefore, in order to shorten the manufacturing period of the mold and reduce the cost, a mold constituted by laminating different kinds of metals is adopted. That is, as the surface layer portion forming the cavity surface, copper or aluminum metal that is easy to cut is used, while as the reinforcing portion, a metal having high strength (for example, to maintain the rigidity of the mold during resin molding) is used.
Zinc) is used. As this type of technique, for example, a molding die disclosed in Japanese Patent Application Laid-Open No. 2-200321 is known.

By the way, when the surface layer portion made of an aluminum alloy is provided on the reinforcing portion as described above, for example, as disclosed in JP-A-7-214568,
Stainless steel (reinforcement part) and aluminum alloy are metallurgically joined by explosive pressure bonding to create a clad plate, and a die is engraved from the surface of the aluminum alloy of the clad plate to create a resin molding die. ing.

[0005]

However, the above-mentioned conventional technique requires a step of metallurgically joining the aluminum alloy and the stainless steel and a step of engraving the clad plate produced by this joining. . This makes the mold manufacturing work considerably complicated, and
The problem of increased manufacturing time and costs has been pointed out.

The present invention solves this kind of problem, and manufactures a highly accurate composite material mold having excellent durability, and at the same time, resin molding capable of improving the efficiency and simplification of the entire manufacturing operation. An object of the present invention is to provide a method and an apparatus for manufacturing a metal mold.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a cast iron reinforcing mold part provided with a riser and a sand mold are clamped as an upper mold and a lower mold, respectively.
By pouring molten aluminum alloy into the cavities formed between them, a mold in which the cast iron reinforcing mold part and the aluminum alloy layer are integrally laminated is manufactured. Therefore, the riser does not exist on the surface of the aluminum alloy layer which is the molding surface, the post-processing of the aluminum alloy layer is easily performed, and the entire die manufacturing operation is simplified.

Further, a feeder is provided on the cast iron reinforcing die itself which is the upper die, and the feeder is used as a passage for discharging the gas existing in the cavity to the outside. As a result, it is not necessary to provide a dedicated gas discharge passage in the mold, and the entire structure of the mold is effectively simplified.

Further, when the riser has a narrow passage on the side of the opening communicating with the cavity, the aluminum alloy solidified by the riser is formed between the aluminum alloy layer and the cast iron reinforcing die portion due to the step shape. It has a function to prevent the occurrence of floating and warping. Moreover, the contact area between the aluminum alloy layer and the cast iron reinforcing mold part is significantly increased, and the resin molding work is performed by using a mold integrally manufactured from the aluminum alloy layer and the cast iron reinforcing mold part. When performing, the molding pressure such as the resin pressure and the mold clamping pressure can be reliably received by the cast iron reinforcing mold part. This makes it possible to effectively improve the rigidity of the entire mold.

[0010]

1 is a vertical sectional view of a manufacturing apparatus 10 according to an embodiment of the present invention. This manufacturing apparatus 10 is
Reinforced mold part made of cast iron (hereinafter referred to as FC frame) which is the upper mold 1
2 and a lower sand mold 14. A molding cavity 16 into which molten aluminum alloy 15 is poured is formed between the FC frame 12 and the sand mold 14, and a plurality of feeders 18 communicating with the cavity 16 are formed in the FC frame 12. It is provided.

The riser 18 has a narrow passage portion 20 on the side of the opening communicating with the cavity 16, and the enlarged diameter portion 24 communicates with the narrow passage portion 20 via a step portion 22. The expanded diameter portion 24 is provided with a heat insulating tube body 26 having one end abutting on the step portion 22 and the other end protruding outside the FC frame 12. A plurality of recesses 28 having an arcuate cross section are formed in the surface portion 12a of the FC frame 12 on the cavity 16 side, and a cooling pipe 30 is held in each recess 28 via a pipe support member 32. On one end side of the FC frame 12, the bulging portion 1 is bent into a substantially L shape.
2b is provided.

The sand mold 14 has a sprue 34 for pouring the molten aluminum alloy 15 and a runner 36 communicating with the spout 34 for introducing the molten aluminum alloy 15 into the cavity 16. The sand mold 14 has a plurality of iron cooling bars 3 corresponding to the surfaces forming the cavities 16.
8 is buried.

The operation of the manufacturing apparatus 10 thus configured will be described below in connection with the manufacturing method according to this embodiment.

First, as shown in FIG. 2A, a disappearing model 50 for manufacturing the FC frame 12 by a full molding method is formed. The vanishing model 50 has a recess 52 corresponding to the recess 28 of the FC frame 12, and a plurality of pipe support members 32 for supporting the cooling pipe 30 are arranged in each recess 52 ( (See FIG. 3).

A plurality of stepped hole portions 54 corresponding to the feeders 18 are formed on the surface of the vanishing model 50 on the side opposite to the cavity 16 side, penetrating the surface on the cavity 16 side (see FIG. 4). ). The disappearance model 50 has an FC frame 12 on one end side.
In addition to having the bulging portion 56 corresponding to the bulging portion 12b, a plurality of holes 58 communicating with the recess 52 are formed on both sides of the fugitive model 50.

Next, as shown in FIG. 2B, the fusible model 50 is placed in an iron frame 60, and the iron frame 60 is filled with sand 62 to form a sand mold 64. Molten cast iron 68 is supplied to the gate 66 provided in the sand mold 64 (see FIG. 2C), and the extinguishable model 50 is burnt and disappears to replace the molten metal, and the FC frame 12 is manufactured.

As shown in FIG. 2D, the cooling pipes 30 are set in the FC frame 12 taken out from the sand mold 64 via the pipe support members 32 corresponding to the respective recesses 28.
The pipe support member 32 may be embedded in the cast FC frame 12 without providing the pipe support member 32 in the disappearance model 50.

On the other hand, as shown in FIG. 5A, a model 70 corresponding to the size of a resin molding die described later is formed by using, for example, styrofoam. As shown in FIG. 5B, the model 70 is set in an iron frame 72, sand 74 is filled in the iron frame 72, and a plurality of chills 38 are arranged on the cavity surface 70a of the model 70.

Further, a plurality of iron frames 72 are laminated to form a sand mold forming portion 78 so that the entire model 70 is completely embedded in the sand 74. As shown in FIG. 5D, the sand mold component 78 is inverted and the model 70 is taken out from the inside thereof, and the sprue 34, the runner 36, etc. are formed, whereby the sand mold 14 is obtained.

As described above, the FC frame 12 and the sand mold 14
6A is manufactured, the front surface 12a side of the FC frame 12 is heated by the heater 80 as shown in FIG. 6A. The temperature of the surface portion 12a is a predetermined temperature (330 ° C to 350 ° C).
When it is detected by the temperature detecting means 82 that the temperature reaches 80 ° C., the FC frame 12 is placed on the sand mold (lower mold) 14 as the upper mold. Next, as shown in FIG. 6B, after the heat insulating tube 26 is arranged in the feeder 18 of the FC frame 12, the molten aluminum alloy 15 is poured into the gate 34 of the sand mold 14.

As shown in FIG. 1, the molten aluminum alloy 15 reaches the runner 36 from the sprue 34 of the sand mold 14, and is supplied to the cavity 16 side from between the bulging portion 12b of the FC frame 12 and the sand mold 14. It Cavity 16 to Oshiba 1
When the molten aluminum alloy 15 supplied to No. 8 begins to solidify and shrink,
Is replenished.

Next, the molten aluminum alloy 15 is solidified by performing a cooling treatment such as natural cooling or forced cooling, and a resin molding die 90 in which the aluminum alloy layer 88 is integrally laminated on the FC frame 12 is formed. Are manufactured (see FIG. 7).
The mold 90 is removed from the sand mold 14 (see FIG. 6D), and unnecessary portions solidified corresponding to the sprue 34, the runner 36, etc. are removed.

In this case, in this embodiment, the FC frame 12 is an upper mold and the feeder 18 is directly formed on the FC frame 12. Therefore, as shown in FIG. 7, the aluminum alloy stepped portion 92 solidified corresponding to the feeder 18 does not exist on the surface portion 88a of the aluminum alloy layer 88 which is the molding surface. Therefore, the post-processing performed on the aluminum alloy layer 88 is performed by the surface portion 88 which is the cavity surface.
It is only necessary to smooth a, and the working operation of the surface portion 88a can be simplified at once, and the overall manufacturing work of the die 90 can be simplified.

Further, since the riser 18 is formed on the FC frame 12 itself, the gas in the molten aluminum alloy 15 with which the cavity 16 is filled is surely passed through the riser 18 to the outside of the manufacturing apparatus 10. Is discharged. As a result, it is not necessary to provide a dedicated passage for degassing in the manufacturing apparatus 10, and the structure of the entire manufacturing apparatus 10 is effectively simplified.

Moreover, in the present embodiment, the feeder 18 has the narrow passage portion 20 on the side of the cavity 16 and the end portion of the narrow passage portion 20 communicates with the expanded diameter portion 24 via the step portion 22. It is set to the attached shape. Therefore, when the molten aluminum alloy 15 supplied to the feeder 18 is solidified, the stepped portion 92 integrated with the aluminum alloy layer 88 is formed as shown in FIG.
Is formed. Therefore, when the molten aluminum alloy 15 is solidified in the cavity 16, it can be prevented from being deformed and floating or warping between the aluminum alloy layer 88 and the FC frame 12.

Furthermore, since the plurality of stepped portions 92 are integrally provided on the aluminum alloy layer 88, the contact area between the aluminum alloy layer 88 and the FC frame 12 is increased at once. Thus, when resin molding is performed using the mold 90, a molding pressure such as a resin pressure or a mold clamping pressure can be effectively received by the FC frame 12, and the durability of the mold 90 is improved. is there.

[0027]

In the method and apparatus for manufacturing the resin molding die according to the present invention, the cast iron reinforcing die portion provided with the riser and the sand die are formed as the upper die and the lower die, respectively, and between them. Pour molten aluminum alloy into the cavity formed in
A composite material mold in which the cast iron reinforcement mold part and the aluminum alloy layer are laminated is obtained. Therefore, there is no riser on the surface portion of the aluminum alloy layer that is the molding surface,
The post-processing work of this surface portion is simplified at once, and the entire mold manufacturing work is simplified. Furthermore, since the feeder is directly provided on the cast iron reinforcing mold part which is the upper mold, an aluminum alloy layer of excellent quality can be obtained, and this feeder can be used as a hole for gas discharge, and the entire manufacturing apparatus can be used. The configuration is simplified.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional explanatory view of a manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a manufacturing process diagram of a cast iron reinforcing mold part constituting the manufacturing apparatus, FIG. 2A is a perspective explanatory view of a fusible model, and FIG. 2B is a sand mold in which the fusible model is arranged. 2C is an explanatory view when filling the sand mold with molten cast iron, and FIG. 2D is a perspective view of a cast iron reinforcing mold part cast by the sand mold.

FIG. 3 is an enlarged cross-sectional view of the pipe support member in FIG. 2A.

FIG. 4 is a view on arrow Z in FIG. 2A.

5A and 5B are explanatory views of a manufacturing process of a sand mold constituting the manufacturing apparatus, FIG. 5A is a perspective explanatory view of a model corresponding to a mold shape, and FIG. FIG. 5C is a perspective view of a state in which a wrench is set, FIG. 5C is a perspective view of a state in which the model is arranged in a sand mold, and FIG. 5D is a perspective view of a state in which the model is taken out from the sand mold. .

[Fig. 6] Fig. 6 is an explanatory diagram for manufacturing a mold by the cast iron reinforcing mold part and the sand mold, and Fig. 6A is an explanatory diagram for heating the cast iron reinforcing mold part. 6B is a perspective view of the heated cast iron reinforcing mold part set in the sand mold, and FIG. 6C is a perspective view of pouring molten aluminum alloy into the mold, and FIG. FIG. 3 is a perspective view showing a state in which a mold produced by solidifying a molten aluminum alloy is released from a sand mold.

FIG. 7 is a vertical cross-sectional view of a mold manufactured by the manufacturing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Manufacturing apparatus 12 ... FC frame 12a ... Surface part 14 ... Sand mold 16 ... Cavity 18 ... Riser 20 ... Narrow part 26 ... Adiabatic tube 28 ... Recess 30 ... Cooling pipe 32 ... Pipe support member 34 ... Gate 36 ... Runner 38 ... Chilled metal 50 ... Disappearance model 70 ... Model 90 ... Mold for resin molding

Claims (3)

[Claims] 1. A step of clamping a cast iron reinforcing mold part and a sand mold with a cast iron reinforcing mold part provided with a riser as an upper mold and a sand mold as a lower mold. The step of pouring molten aluminum alloy into the molding cavity formed between the reinforcing mold part made of sand and the sand mold, and by performing a cooling process, the reinforcing mold part made of cast iron and the aluminum alloy layer are integrated. And a step of manufacturing a composite material-made metal mold, which is laminated physically, and a method for manufacturing a resin-molding metal mold. 2. A cast iron reinforcing mold part which is an upper mold, and a sand mold which is a lower mold clamped to the cast iron reinforcing mold part, and the cast iron reinforcing mold part and the sand mold. Molding cavities, in which molten aluminum alloy is poured, are formed between, and the cast iron reinforcing mold part is provided with feeders communicating with the molding cavities. Mold manufacturing equipment. 3. The manufacturing apparatus according to claim 2, wherein the riser provided in the cast iron reinforcing mold part has a narrow path part on the opening side communicating with the molding cavity. Mold manufacturing equipment.