JP5290555B2 - Molding mold manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a molding die whose production period can be remarkably reduced, and further having improved strength and durability, and, whose production is easy, and which is also economically advantageous, and to provide a master model thereof. <P>SOLUTION: The method for producing a molding die comprises: a stage where an object model 20 is prepared; a stage where the object model is mounted freely removably, so as to create a master model 30; a stage where a pattern 41 for a cavity die essentially consisting of a zinc alloy and the master model 30 are matched, a metal resin is injected from a resin injection part 44 into a space 43 forming a die face part, so as to create a cavity die 40; and a stage where the object model is arranged at the die face part 49 of the cavity die, thereafter, the cavity die and the pattern 51 for a core die essentially consisting of a zinc alloy are matched, and a metal resin is injected from a resin injection part 54 of the pattern for a core die into a space 53 for forming a die face part, so as to create a core die 50. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

The present invention relates to a mold manufacturing method.

  Molds for large parts (car bumpers, instrument panels, back door panels, etc.) and plastic articles for injection molding, low pressure RIM molding, etc. For example, the mold surface is often composed of a concave cavity mold in which the mold surface is recessed in the shape of a molded product and a convex core mold in which the mold surface protrudes. In order to obtain such a mold, a master model such as a wooden mold is usually manufactured. Then, the surface shape of the master model is transferred with silicon resin, epoxy resin or the like to produce a cavity mold, and then a member in which the surface shape on the recessed side of the product is formed is installed in the cavity mold, and the resin To obtain a core mold. In such a manufacturing method using a master model, it takes 4 to 6 weeks to produce a series of a master model, a cavity mold, and a core mold, and the production cost of the mold increases.

  In order to remedy the above problems, the applicant has a predetermined mold surface shape formed by the stereolithography method using an optical modeling material or the powder sintering modeling method using a powder modeling material. A thin-walled surface layer, a reinforcing rib formed integrally with the thin-walled surface layer on the back surface side of the thin-walled surface layer, respectively, by the stereolithography method or the powder sintering molding method, and a back surface of the thin-walled surface layer The structure of the shaping | molding die which consists of a lining resin layer with which the space of the said reinforcement rib part of the side was integrally filled was proposed (patent document 1).

This prior art can be manufactured in a short period of time compared to the prior art, and has been highly evaluated as a prototype mold and a small quantity and a variety of molds.
JP2003-94443

This invention proposes a mold that can greatly shorten the production period, but further improves the strength and durability, and is easy to produce and economically advantageous. This is a proposal.

That is, the invention of claim 1 includes a step of creating a real model (20) having a recess from the three-dimensional data of a molded product, a parting surface (32), a protrusion (35) and a step ( 36) is prepared, and a master model (31) is prepared, and a recess of the real model is removably fitted to the protrusion (35) and the step (36) to attach the master model (30). A cavity mold element mainly composed of a zinc alloy having a forming step, a parting surface (42), a mold surface portion forming space (43), and a resin injection portion (44) into the mold surface portion forming space. The step of creating a mold (41), the parting surfaces (32, 42) of the master mold (41) for the cavity mold and the master model (30) are bonded together, and the resin is injected. Metal resin from the part to the mold surface forming space A step of forming a cavity mold (40) integrally having a mold surface portion (49) made of the metal resin, a parting surface (52), a mold surface portion forming space (53), and the mold surface portion forming space; Forming a core mold master mold (51) mainly composed of a zinc alloy having a resin injection portion (54) to a place, and replacing the real model (20) removed from the master model with the cavity mold mold After being arranged on the surface portion (49), the parting surfaces (42, 52) of the cavity mold (40) and the core mold master mold (51) are bonded together to form a mold, and the core mold master And a step of injecting a metal resin from the resin injection portion of the mold into the mold surface portion forming space to produce a core mold (50) integrally including the mold surface portion (59) of the metal resin. Concerning the manufacturing method of molding dies

  According to a second aspect of the present invention, in the first aspect, the mold for molding according to the first aspect has a structure in which the cavity mold (40) and the core mold (50) are attached to the respective mold bases (13, 14). Related to the manufacturing method.

According to the invention of claim 1, as described above, a master model element having a parting surface, a projecting part and a step part formed by creating a real model having a recess from the three-dimensional data of the molded product A mold is prepared, a master model is created by removably fitting the recess of the real model to the protrusion and step, and a cavity mold is formed by matching the master model with the cavity mold master mold. On the other hand, since the core mold is created by placing the actual model in the cavity mold and matching with the core mold master mold, the production period is greatly shortened by an extremely simple continuous process. can do. In addition, the cavity mold and the core mold are each formed by integrally injecting a metal resin into the former mold surface portion forming space mainly composed of a zinc alloy, and the mold surface portion of the metal resin is integrally formed. With a simple and reliable process, strength and durability can be improved, and a molding die that is economically advantageous can be obtained.

  In addition, according to the invention of claim 2, since the cavity mold and the core mold are structured to be attached to the respective mold bases, the molding with these molding dies can be easily and easily performed efficiently. Can do.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic sectional view showing a state where a molding die manufactured by the manufacturing method of the present invention is mounted on a mold base of an injection molding machine, FIG. 2 is a sectional view showing an example of a real model, and FIG. FIG. 4 is a cross-sectional view of a master model and a cavity mold master, and FIG. 5 is a cross-sectional view of a cavity mold formed by forming a mold surface portion on the cavity mold master. 6 is a cross-sectional view of a state in which the cavity mold and the core mold original mold are combined, and FIG. 7 is a cross-sectional view of a state in which a core surface is formed by forming a mold surface portion on the core mold original mold.

  The molding die 10 of the injection molding machine shown in FIG. 1 is a schematic cross-sectional view of a state in which a cavity die 40 and a core die 50, which are molding dies obtained by the present invention, are mounted on the mold bases 13 and 14, respectively. . As specified in the invention of claim 2, dedicated mold bases 13 and 14 are prepared in advance, and the molds 40 and 50 are structured so as to be nestable with respect to the mold base. It is possible to reduce the time and the molding cost. The mold bases 13 and 14 are known ones. In FIG. 1, reference numeral 11 is a fixed platen, 12 is a sprue hole, 16 is a movable platen, 17 is an ejector pin, and P is a molded product.

  Further, with respect to the cavity mold 40 shown in FIG. 1, reference numeral 41 is a cavity mold master mold mainly composed of a zinc alloy, 42 is a parting surface, 49 is a mold surface portion made of metal resin, and 49S is its mold surface (surface). . Similarly, with respect to the core mold 50, reference numeral 51 denotes a core mold original mold mainly composed of a zinc alloy, 52 denotes a parting surface, 59 denotes a mold surface portion made of a metal resin, and 59S denotes the mold surface (surface). Hereinafter, a method for manufacturing the cavity mold 40 and the core mold 50 will be described with reference to the drawings.

  The manufacturing method according to the invention of claim 1 includes a step of creating a real model 20, a step of creating a master model 30, a step of creating a cavity mold master 41, a step of creating a cavity mold 40, a core It has the process of creating the mold original mold 51, and the process of creating the core mold 50.

  The process of creating the real model 20 is based on the three-dimensional data of the molded product, as in the example shown in FIG. 2, for example, a powder molding method using a stereolithography method using a known stereolithography material or a powder modeling material. Created by modeling method.

  In the process of creating the master model 30, as shown in FIG. 3, the master model 30 is created by detachably mounting the real model 20 on the master model master 31 having the parting surface 32. As the master model base 31, a known wooden shape or chemical wood is used. In order to detachably mount the real model 20, as shown in the figure, the projection 35 and the stepped portion 36 may be formed and fitted to the original mold 31 by using a recess or the like of the real model 20. Good.

  As shown in FIG. 4, the step of creating the cavity mold base mold 41 is performed by using a material mainly composed of a zinc alloy to the parting surface 42, the mold surface portion forming space 43, and the mold surface portion forming space. The resin injection part 44 is formed. A material mainly composed of a zinc alloy is used in this type of mold as “ZAS”.

  As shown in FIG. 5, the step of creating the cavity mold 40 is performed by fitting the parting surfaces 32 and 42 of the cavity mold master 41 and the master model 30 together, and matching the mold 41. A metal mold R is injected from the resin injection portion 44 into the mold surface portion forming space to make a cavity mold 40 integrally having a mold surface portion 49 made of the metal resin. Metal Resin R is a heat-resistant surface casting material in which aluminum fine powder is mixed in an epoxy resin, which is usually used as a resin mold. In the examples, the trade name “Quinate MEZ360” manufactured by Bantico Co., Ltd. was used. In addition, thermosetting conditions are 12 hours at 60 degreeC.

  Next, as shown in FIG. 6, the step of creating the core mold master 51 is performed using a material mainly composed of zinc alloy similar to the cavity mold master 41 and the parting surface 52 and the mold surface portion. A forming space 53 and a resin injection portion 54 into the mold surface portion forming space are formed.

  As shown in FIG. 7, in the process of creating the core mold 50, first, the actual model 20 removed from the master model 30 is placed on the mold surface portion 49 of the cavity mold 40. Thereafter, the parting surfaces 42 and 52 of the cavity mold 40 and the core mold original mold 51 are bonded together to form a mold, and from the resin injection portion 54 of the core mold original mold 51, a mold surface portion forming space is formed. A metal resin R is injected into 53, and a core mold 50 integrally having a mold surface 59 of the metal resin R is produced. A mold surface portion 49 is integrally formed. As the metal resin R, a heat-resistant surface casting material in which aluminum fine powder was mixed in the same epoxy resin as the mold surface portion 49 of the cavity mold 40 was used.

FIG. 1 is a schematic cross-sectional view showing a state where a molding die manufactured by the manufacturing method of the present invention is mounted on a mold base of an injection molding machine. FIG. 2 is a cross-sectional view showing an example of a real model. FIG. 3 is a cross-sectional view of the master model. FIG. 4 is a cross-sectional view showing a state in which the master model and the cavity mold master are combined. FIG. 5 is a cross-sectional view of a state in which a cavity surface is formed by forming a mold surface portion on a cavity mold base mold. FIG. 6 is a cross-sectional view of a state in which the cavity mold and the core mold are combined. FIG. 7 is a cross-sectional view of a state in which the core surface is formed by forming the mold surface portion on the core mold original mold.

DESCRIPTION OF SYMBOLS 10 Mold 13,14 Mold base 20 Real model 30 Master model 31 Master model original mold 32 Parting surface 40 Cavity mold 41 Cavity mold original mold 42 Parting surface 43 Mold surface part formation space 44 Resin injection part 49 Mold surface part 50 Core mold 51 Core mold original mold 52 Parting surface 53 Mold surface section forming space 54 Resin injection section 59 Mold surface section

Claims (2)

Creating a real model (20) having a recess from the three-dimensional data of the molded article;
A master model master mold (31) having a parting surface (32) and having a protrusion (35) and a step (36) is prepared, and the protrusion (35) and the step (36) are Creating a master model (30) by detachably fitting the recess of the real model ;
A cavity mold master (41) mainly composed of a zinc alloy having a parting surface (42), a mold surface portion forming space (43), and a resin injection portion (44) into the mold surface portion forming space. Creating a process;
The parting surfaces (32, 42) of the cavity mold master (41) and the master model (30) are bonded together to form a mold, and from the resin injection part to the mold surface part forming space Injecting a metal resin to create a cavity mold (40) integrally having a mold surface portion (49) of the metal resin;
A core mold master (51) mainly composed of a zinc alloy having a parting surface (52), a mold surface portion forming space (53), and a resin injection portion (54) into the mold surface portion forming space. Creating a process;
The actual model (20) removed from the master model is placed on the mold surface (49) of the cavity mold, and then the parting surface (42) between the cavity mold (40) and the core mold original mold (51). , 52) and mold matching, injecting a metal resin from the resin injection part of the core mold original mold into the mold surface part forming space and integrating the mold surface part (59) by the metal resin integrally Forming a core mold (50) having a process for producing a mold for molding.   The method for manufacturing a molding die according to claim 1, wherein the cavity mold (40) and the core mold (50) are attached to respective mold bases (13, 14).

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