JPS63299825A - Method and device for manufacturing simple press die - Google Patents

Abstract

PURPOSE:To eliminate the need for correcting from the beginning even in case of some change in designing and to improve the working efficiency by pouring a molten resin onto the face of a reference die and forming a surface resin mold o the surface of the core for die holding corresponding to the reference die after its hardening. CONSTITUTION:The master model 1 easy to change a die face is formed by a plaster, etc., based on a original die model. The gel coating of an adequate resin is then poured on the die face of the master model 1 to form a surface layer 2 and on the upper face thereof what a quartz, etc., are added to the adequate resin is poured to form the intermediate layer 3 which is thicker compared to the surface layer 2. What a silica sand, etc. is added to the adequate resin is then charged to form the core 5 for die holding planning the accuracy maintenance of the die and the guide pipe 6 engaged with a blank cap 10 on the surface resin die side is buried at adequate intervals. The surface resin mold can be used as a male die after the poured molten resin being hardened. In the case of a design change, the core 5 is removed, the specified part of the die face is formed in the necessary shape and the surface resin mold of the core 5 is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for manufacturing a simple press mold used, for example, for molding a prototype of an automobile body.

(Prior art and its problems) Conventionally, the manufacturing method of this type of simple press type manufacturing equipment is as follows:
First, an inverted reference mold (master model) is made using plaster, for example, from a predetermined master model made of clay, and then a predetermined molten resin is injected onto the mold surface of this master model, and then a predetermined molten resin is injected onto the mold surface of this master model. By loading a shape-retaining core made of resin, silica sand, etc. and fixed in a wooden frame,
A press mold is manufactured in which the cured resin is used as a surface resin mold.

However, according to such conventional methods, for example, if a slight design change is required for a product, the press mold manufacturing process must be restarted from the beginning each time the design change is made, which is unfavorable in terms of work efficiency and product cost. There was a point.

(Means for Solving the Problems) The present invention has been made to solve the problems of the prior art, and the first invention is a method of manufacturing a reference mold from a material that is easy to modify based on a prototype. a second step of injecting molten resin into the mold surface of the base 7 mold and, after curing, forming a surface resin mold on the surface of the shape-retaining core corresponding to the reference mold; a third step of removing the surface resin mold when modifying the surface; and a third step of removing the surface resin mold when modifying the surface;
A third step of injecting molten resin between the modified standard mold and the core through any of the pipes, and a surface in the third step when the mold surface of the base r114 mold is modified again. a fourth step of removing the resin mold; and a fifth step of injecting molten resin between the reference mold after the modification again and the TFIJ core through the second pipes inserted into each of the first pipes. The purpose of the present invention is to provide a simple method for manufacturing a press mold, which allows most of the previous processes to be used even when changing the mold surface of a press mold, contributing to improving work efficiency and reducing costs. do.

Further, the second invention provides a simple press mold manufacturing apparatus for forming a surface resin mold for press molding on the shape retaining core by curing the molten resin injected between the reference mold and the shape retaining core. In the shape-retaining core, one end side opening faces the surface resin mold and the other end side faces the outside.
A pipe is provided, and a second pipe is further provided, which is inserted into the first pipe, one end side 11 old 1 faces the surface resin mold, and the other end side faces the outside.
It is an object of the present invention to provide a manufacturing apparatus that can easily carry out the manufacturing method according to the first invention.

(Function) When manufacturing a male mold, first, a standard mold (master model) whose mold surface can be easily modified is manufactured using plaster or the like based on the prototype model, and then a surface resin mold is applied to the mold surface of the standard mold. Molten resin is injected to form the mold, and a shape-retaining core made of resin, silica sand, etc. is loaded above it. If a design change occurs thereafter, the surface resin mold attached to the shape-retaining core is removed using a predetermined tool. Next, a molten resin is injected between the modified group/-11i mold and the core through any one of the plurality of first pipes embedded in the core to form a modified surface resin mold. to form. If a design change occurs again, remove the modified surface resin mold in 0;j in the same way as above, and then insert the second pipes into each of the first pipes in n;1. the standard model after modification again through one of the second pipes;
1. Molten resin is injected between the core and the modified surface resin mold again. In other words, if a configuration change occurs, 1); The main parts, such as the mold and shape-retaining core, can be reused without major changes.

(Example) The press mold manufacturing apparatus according to the present invention is configured as shown in FIGS. 2 and 3, and includes a master molded by inverting the surface of the original model using plaster or the like based on a predetermined original model. A model 1, a surface resin mold formed on this master model l, consisting of a surface layer 2 and an intermediate layer 3, which can withstand the press pressure during press molding, and a wooden frame 4, which is framed by adding silica sand to the resin. a shape-retaining core 5, and a guide pipe (first pipe) that is buried in the shape-retaining core 5 at appropriate intervals and whose axial direction is the direction penetrating the mold surface of the master model l.
, and is roughly made up of an injection pipe 7 (second pipe) that is inserted into this guide pipe when desired (when modifying the master model I to be described later).

Here, the details of the relationship between the guide pipe 5 and the injection pipe 7 are shown in FIG.
Furthermore, a wax material 9 is adhered to the inner circumferential surface of each of them with an appropriate thickness.

Next, a manufacturing process using the press mold manufacturing apparatus configured as described above will be explained.

First, a master model l whose mold surface can be easily modified is manufactured using plaster or the like based on the prototype model. Next, as in the case of conventional resin molding, the mold surface (top surface) of the master model l is
In order to form a surface layer 2, a suitable resin gel coat is injected, and in order to form an intermediate layer 3, which is thicker than the surface layer 2, on the upper surface, a resin containing quartz or the like is injected. continue,
In order to form a shape-retaining core 5 that maintains the accuracy of the mold, a resin containing silica sand or the like was loaded as appropriate, and a blind plug 10 (see Fig. 2) was fitted to one end side, that is, the surface resin mold side. For example, guide pipes made of vinyl are buried at appropriate intervals. Then, the wooden frame 4 is used to determine the frame.

In this way, the injected molten resin hardens and the molded surface resin mold can be used as a male mold unless the design is changed thereafter.

When a design change occurs, after removing the master model 1'' shape-retaining core 5, mold a predetermined part of the mold surface into the desired shape, and cut the surface resin mold of the core 5 using a tool such as a chisel. (also remove the blind stopper 1O).

In this state, the injection pipe 7 is inserted into each guide pipe in the manner shown in FIG. 1, and the shape-retaining core 5 and the wooden frame 4 are again mounted on the master model l.

Subsequently, the molten resin in the hot water bath 12 is injected from the open end (upper end in FIG. 3) of one of the injection pipes 7 via the injection jig 11 to form the surface resin mold.

If further design changes occur after that, the master model 11. The shape-retaining core 5 is removed from the master model 1, and the surface resin mold is removed by tapping the open end of the injection pipe 7 toward the surface resin mold, for example, to modify the mold surface of the master model 1. Thereafter, the injection pipe 7 is inserted into the guide pipe again and a surface resin mold is molded in the same manner as described above.

In the above description, the case of molding a male mold was explained, but the same explanation can be applied to the case of molding a female mold.

4 to 6 show the actual manufacturing process of the press mold, and as shown in FIG. 4, a surface resin mold is formed on the end face of the shape-retaining core 5 through the above-mentioned steps. Then, the wooden frame 4 is removed and a new outer wooden frame 13 is used to determine the frame as shown in FIG. A pair of blank holders 14. No. 14 are molded for the square mold.

Next, the female core 5 is turned upside down and a female core 15 is molded above it in the same procedure as the molding of the core 5. In this way, a pressed product can be formed between the male core 5 (punch) and the female core 15 (die).

(Effects of the Invention) As described above, according to the first invention, the first step of manufacturing a reference mold from a material that is easy to modify based on the prototype;
a second step of injecting a molten resin into the mold surface of the reference mold and, after curing, forming a surface resin mold on the surface of the shape-retaining core corresponding to the reference mold; a third step of removing the surface resin mold at the time of modification, and 1): between the modified reference mold and the core via any one of the plurality of first pipes embedded in the core j. A third step of injecting molten resin, a fourth step of removing the surface resin mold in the third step when modifying the mold surface of the FF1F base 111 mold again, and a second step of removing the surface resin mold in the third step; The fifth step consists of injecting molten resin between the core and the standard mold with the first degree of wiring modification via the second pipe, so even if there are some design changes, it can be done easily. By simply adding a process, there is no need to reassemble the manufacturing equipment from the beginning.
You can take flexible action and contribute to improving work efficiency and reducing costs.

According to the second invention, the simple press forms a surface resin mold for press molding on the shape-retaining core by curing the molten resin injected between the reference mold and the shape-retaining core. In the mold manufacturing apparatus, a first pipe having one end opening facing the surface resin mold and the other end facing the outside is provided in the mold retaining core described in n;1, and further, the first pipe is inserted into the first pipe. Since the second pipe is provided with one end facing the surface resin mold and the other end facing the outside, it is possible to easily carry out the first invention. This method is particularly useful for trial production aimed at small-lot production.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the configuration of a press mold manufacturing apparatus according to the present invention, FIGS. 2 and 3 are cross-sectional views explaining step 1 of the press mold manufacturing method, and FIGS. FIG. 6 is a perspective view for explaining the process of completing an apparatus for actual press forming. 1... Master model (basopharyngeal type), 2... Surface layer (
surface resin type), 3... intermediate layer (surface resin type), 5...
・Shape retaining core, 6... Guide pipe (first pipe),
7... Injection pipe (second pipe).

Claims (1)

[Claims] 1. A first step of manufacturing a reference mold from a material that is easy to modify based on the original model, and a mold retaining process that corresponds to the reference mold after injecting molten resin into the mold surface of the reference mold and curing it. a second step of forming a surface resin mold on the surface of the core; a third step of removing the surface resin mold when modifying the mold surface of the standard mold; and a plurality of first pipes embedded in the core. a third step of injecting molten resin between the modified standard mold and the core, and removing the surface resin mold in the third step when modifying the mold surface of the standard mold again. and a fifth step of injecting molten resin between the reference mold after modification again and the core through second pipes inserted into each of the first pipes. Production method. 2. In a simple press mold manufacturing apparatus for forming a surface resin mold for press molding on the shape-retaining core by curing molten resin injected between the reference mold and the shape-retaining core, the shape-retaining core a first pipe having one end opening facing the surface resin mold and the other end facing the outside in the core;
Furthermore, a second pipe is inserted into the first pipe, and has one end opening facing the surface resin mold and the other end facing the outside.
A simple press type manufacturing device characterized by a pipe.