TWI680849B - Intermediary mold manufacturing method - Google Patents

Abstract

The invention provides an intermediate mold, which comprises a central block and an outer frame layer. The central block is made of foamed material, and the outer frame layer is made of colloidal material. In addition, the invention also provides a method for manufacturing the intermediate mold. The intermediary mold can retain the characteristics of good mold release and mold reversion rate, and has the advantages of light weight, durability and low cost.

Description

Intermediary mold manufacturing method

The invention relates to a mold and a manufacturing method thereof, in particular to a composite material intermediate mold and a manufacturing method thereof.

Moulds are very popular in the industry, and they are an important tool for mass-produced products in industries such as autos, locomotives, medical, and optoelectronics.

The traditional molds used to make related products include metal molds, steel molds, wooden molds, plastic molds, rubber molds or silicone molds. Hard molds such as metal molds, steel molds, and wood molds are not easy to deform and have good durability, but the mold releasability is poor. Therefore, when using these molds, a mold release agent is generally applied to assist the mold release. However, the use of mold release agents not only increases the cost, but also makes the surface properties of the finished product unstable. Although plastic molds, rubber molds, or silicone molds do not have the problem that the hard molds are not easy to demold, and have better demoldability and mold reversal rate, they have poor durability, short life and shortcomings of easy deformation. , Only suitable for making small molds. In order to improve the shortcomings of the aforementioned plastic molds, rubber molds or silicone molds, some manufacturers use reinforcement materials (such as glass fiber, carbon fiber or metal fiber) to increase the strength of rubber, plastic or silicone molds to increase their durability and application. Sex.

Therefore, the object of the present invention is to provide a light-weight and easily demolded intermediate mold.

Therefore, the intermediate mold of the present invention is used for reproducing a component with a mother molding surface, including a central block and an outer frame layer.

The center block is made of foamed material and has a molding surface.

The outer frame layer is made of colloid as a material, covering the central block, and the outer frame layer cooperates with the molding surface to form a child molding surface matching the mother molding surface.

In addition, another object of the present invention is to provide a method for manufacturing an intermediate mold for reproducing an element having a mother molding surface.

Therefore, the manufacturing method of the intermediate mold of the present invention includes: a step A, setting the element in a mold frame, and opening the female molding surface of the element to the outside; a step B, and then covering a first adhesive material on the The molding surface of the mother, the bottom of the mold frame, and the sides of the mold frame, the first glue material is cured to form a first glue layer to obtain a cavity defined by the first glue layer, and the first The adhesive layer has a molding surface matching the contour of the mother molding surface at a position corresponding to the mother molding surface; and a step C, a foaming material is placed into the cavity to harden the foaming material, Forming a central body covering the element, wherein the height of the central body is small At the height of the first glue layer on the side of the mold frame, and the center body and the molding surface of the first glue layer cooperate to form a sub-molding surface matching the contour of the element; Step D, pouring a The second glue material is in the mold cavity, and the second glue material is cured to form a second glue layer covering the central body to obtain a molded product; and a step E, and finally, the molded product and the The components are separated and removed from the mold frame, and the production of the intermediate mold is completed.

The effect of the present invention lies in that an intermediate mold that can be used for reproducing components is prepared by combining the first adhesive layer and the foam material, not only can the outer frame layer be used, so that the intermediate mold retains a good mold turnover rate, The characteristics of easy demoulding, the use of the foamed material to increase the strength and reduce the amount of glue, but also have the advantages of light weight and durability.

100‧‧‧component

101‧‧‧Mold molding surface

102‧‧‧First outline

103‧‧‧The second outline

2‧‧‧intermediary mould

21‧‧‧ First Intermediary Mould

22‧‧‧Second Intermediary Mould

3‧‧‧ Center block

31‧‧‧Forming surface

32‧‧‧non-formed surface

33‧‧‧Center

4‧‧‧Outer frame layer

41‧‧‧First adhesive layer

411‧‧‧Sub molding surface

42‧‧‧Second adhesive layer

5‧‧‧Mold frame

50‧‧‧Step

51‧‧‧Step

52‧‧‧Step

53‧‧‧Step

54‧‧‧Step

6‧‧‧cured colloid block

Other features and functions of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a schematic diagram illustrating an intermediate mold of a first embodiment of the present invention; FIG. 2 is a schematic flow diagram, Explain the manufacturing process of the first embodiment; FIG. 3 is a schematic diagram to help explain the step 51; FIG. 4 is a schematic diagram to help explain the step 52; FIG. 5 is a schematic diagram to help explain the step 53; FIG. 6 is a A schematic diagram to assist in explaining step 54; and FIG. 7 is a schematic diagram illustrating the flow of die casting using the intermediate mold of the present invention.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numbers.

Referring to FIG. 1, an embodiment of the intermediary mold 2 of the present invention has a molding surface matched with the outer contour of an element 100 to be reproduced, and can be used as a mold for reproducing the element 100.

The intermediate mold 2 includes a central block 3 and an outer frame layer 4.

The center block 3 is made of foamed material and has a molding surface 31 and a non-molding surface 32. The molding surface 31 matches at least part of the contour of the element 100; the non-molding surface 32 is relatively away from the molding surface 31 and is a surface that is not used for molding when molding.

In detail, the foaming material can be selected from one of polyurethane, polyethylene, and ethylene vinyl acetate copolymer. In this embodiment, polyurethane foam is used as the foam material for example. Using the porous structure of the foam material, the density is lower than that of silicone, and the strength control after foaming, so that the intermediate mold 2 is lighter in weight and can have a better quality than the intermediate mold made of conventional materials such as silicone or rubber. Better strength, and less deformable.

The outer frame layer 4 is made of gel as a material, covers the central block 3, and has a first adhesive layer 41 and a second adhesive layer 42. The first adhesive layer 41 covers the molding surface 31 and cooperates with the molding surface 31 to form a sub-molding surface 411 matching the partial contour of the element 100. The second adhesive layer 42 is connected to the first adhesive layer 41 and covers the non-forming surface 32.

The main components of the colloid include silicone and hardener. The hardener can be used to promote and control the hardening of the silicone. In the present invention, the surface of the center block 3 is covered with the outer frame layer 4 made of colloidal material (silicone) , It can retain the good moldability of silicone and accurately reproduce the detailed contour of the element 100.

In addition, it should be noted that, since the thickness of the first adhesive layer 41 affects the fineness of the copied device 100, the thickness of the first adhesive layer 41 is between 5 and 15 mm in consideration of the mold release property and the fineness of printing. . The second adhesive layer 42 covering the non-forming surface 32 can be used to protect the central block 3 and adjust the flatness. Therefore, the thickness of the second adhesive layer 42 is greater than that of the first adhesive layer 41 and needs to have a certain thickness , So as to completely cover the central block 3.

In some embodiments, the volume ratio of the center block 3 of the intermediate mold 2 to the outer frame layer 4 is about 7:3, so that the intermediate mold 2 achieves better mechanical strength and can prevent deformation.

Referring to FIG. 2, the manufacturing method of the intermediate mold 2 in the foregoing embodiment is described as follows. The production method includes the following steps: First, step 50 is performed, the component 100 is placed in a mold frame 5, and the female molding surface 101 of the component 100 is opened outward. The mold frame 5 can be selected from, but not limited to, acrylic material, used to carry the element 100 and form the appearance of the intermediate mold 2, therefore, its appearance can be changed according to needs, as long as it can accommodate the element 100 can.

With reference to FIG. 3, step 51 is followed, and the first dynamic adhesive material is applied with a thickness of about 5-15 mm to the mother molding surface 101 of the element 100 and the bottom of the mold frame 5 and placed at room temperature for about 24 hours Wait until the first glue material is cured. Then, the first glue is coated with a thickness of about 5-15 mm on the side of the mold frame 5 and then placed at room temperature for about 24 hours. After the first glue is cured, the first glue can be obtained Layer 41, and a cavity defined by the first adhesive layer 41 and the first adhesive layer 41 in contact with and corresponding to the mother molding surface 101 has a child molding surface matching the outline of the mother molding surface 101 411.

In detail, the first glue material in step 51 is prepared by blending silicone rubber and hardener at a weight ratio of 10:1, and the first glue material evenly stirred and prepared is placed in a vacuum machine for the first vacuum release Foam, using vacuum to remove the gas stuck inside the mixing and stirring, to ensure that the subsequent molding will not cause the defects of poor moldability and insufficient strength due to foaming.

With reference to FIG. 4, step 52 is next performed to place the foam material into the cavity, and the center body 33 can be obtained after the foam material is foamed and hardened.

More specifically, in step 52, polyurethane foam is placed in another container, and the polyurethane foam is stirred evenly. The agent is about 5-10 minutes until it is viscous, and then the stirred polyurethane foaming agent is poured into the cavity. After the polyurethane foaming agent is foamed and hardened, a central body 33 covering the element 100 as shown in FIG. 4 can be formed. Wherein, the central body 33 and the molding surface of the first adhesive layer 41 cooperate to form a sub-molding surface 411 matching the contour of the mother molding surface 101 of the element 100, and the height of the central body 33 is smaller than the first adhesive layer 41 at the height of the side of the mold frame 5 to facilitate the subsequent pouring of the glue material to be connected to the first glue layer 41 and to completely cover the central body 33.

The aforementioned polyurethane foam has the advantages of fast reaction speed, short molding time, easy molding, and easy control of density and hardness. Since the relevant characteristics of the polyurethane foaming agent are well known to those skilled in the art, they will not be repeated here.

With reference to FIGS. 5 and 6, step 53 is followed by placing a plurality of cured colloid blocks 6 as shown in FIG. 5 before the center body 33 is away from the top of the element 100. Wherein, the cured colloidal blocks 6 are blocks that can be cured by the first adhesive material, and then a second adhesive material is poured into the cavity and placed at room temperature for about 24 hours, until the second adhesive material is cured After forming, a molded product having a second adhesive layer 42 covering the central body 33 as shown in FIG. 6 can be produced. Wherein, the cured colloidal blocks 6 and the second colloidal material may be the same material, therefore, the second colloidal material can be integrated with the cured colloidal blocks 6 after curing. In addition, the materials and processes related to the second glue material are the same as those of the first glue material, therefore, no more details will be given here.

It should be noted that, in step 53, the purpose of placing the cured colloid block 6 on the top surface of the central body 33 before pouring the second glue material is to reduce the amount of the second glue material and avoid the second glue material. The material needs a large thickness, the hardening time is too long or the hardening is incomplete. Therefore, the second glue material can be directly poured according to the manufacturing process or requirements without first placing the cured colloid block 6.

Finally, step 54 is performed to separate the molded product from the element 100 and remove it from the mold frame 5 to obtain the intermediate mold 2 as described in FIG. 2.

With reference to FIG. 7, using the intermediate mold of the present invention to reproduce the element 100 shown in FIG. 2 as an example, the first outer outline 102 and the second outer outline of the element 100 can be obtained by using the aforementioned manufacturing method respectively 103 Matches the first intermediary mold 21 and the second intermediary mold 22. Then, the first intermediary mold 21 and the second intermediary mold 22 are used for mold casting, so that the component 100 can be obtained.

In summary, the present invention retains the good mold release properties of silicone, so the surface contour of the element 100 can be completely reproduced, and the low density of the porous structure of the foam material is used to make the intermediate mold 2 Compared with the prior art, it has the advantages of lighter weight and durability, and the larger the size of the intermediate mold of the present invention, the more significant the cost-saving effect, so it can indeed achieve the purpose of cost invention.

However, the above are only examples of the present invention, and should not be used to limit the scope of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as The scope of the invention patent Inside.

100‧‧‧component

2‧‧‧intermediary mould

3‧‧‧ Center block

31‧‧‧Forming surface

32‧‧‧non-formed surface

4‧‧‧Outer frame layer

41‧‧‧First adhesive layer

411‧‧‧Sub molding surface

42‧‧‧Second adhesive layer

Claims (4)

A method for manufacturing an intermediary mold. The intermediary mold is used for reproducing the contour of a component. The component includes a female molding surface. The manufacturing method includes the following steps: a step (A), setting the component in a mold frame, and making The mother molding surface is open to the outside; in step (B), a first glue material is then covered on the mother molding surface, the bottom of the mold frame, and the sides of the mold frame, so that the first glue material is cured to form A first adhesive layer to obtain a cavity defined by the first adhesive layer, and the first adhesive layer has a molding surface matching the contour of the female molding surface at a position corresponding to the female molding surface; one step (C), placing a foam material into the cavity, and foaming and hardening the foam material to form a central body covering the element, wherein the height of the central body is less than that of the first adhesive layer on the The height of the side of the mold frame, and the center body and the molding surface of the first adhesive layer cooperate to form a sub-molding surface matching the contour of the mother molding surface; step (D), the center body is away from the A plurality of cured colloidal blocks are placed on the top of the element, a second glue material is poured into the cavity, and the second glue material is cured to form a second glue covering the central body and covering the cured colloidal blocks at the same time Layer to produce a molded product; and a step (E), and finally, the molded product is separated from the component and removed from the mold frame, that is, the production of the intermediate mold is completed. The method for manufacturing an intermediate mold according to claim 1, wherein the first glue material and the second glue material both include silicone glue. The method for manufacturing an intermediate mold according to claim 1, wherein the foam material is selected from One of polyurethane, polyethylene, and ethylene vinyl acetate copolymer. The method for manufacturing an intermediate mold according to claim 1, wherein the thickness of the first adhesive layer is between 5 and 15 mm, and the thickness of the second adhesive layer is greater than the thickness of the first adhesive layer.

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