Molds and processes for multi-plastic molding

Abstract

To provide molds and processes for multiple plastic molding with low production costs, simple process, suitable for manufacturing products of multiple colors, multiple materials, and multiple joints, and improving production efficiency and good quality rates.SOLUTION: The invention includes a first mold, a second mold and a third mold, and the first mold is opened with a first cavity for injection molding the first part, the second mold is opened with a mask cavity for masking the first part and a second cavity for injection molding the second part, and the third mold is opened with a positioning cavity for placing the first and second parts and a third cavity for injection molding the third part, and the positioning cavity is connected to the third cavity, thereby disclosing a mold and process for multiple plastic molding that connects the third part with the first and second parts in one piece.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the technical field of injection molding, and in particular to a multi-plastic molding mold and process. [Background technology]

[0002] Ordinary two-color plastic molding process is to inject two different materials into the same mold, so that the injection molded parts are made of two materials. For multi-color, multi-material multi-part products, it is necessary to form a single part in a different mold, and then assemble and connect each part together, which makes the assembly process complicated, which not only affects the production efficiency, but also makes the product easy to be damaged, increases the reject rate, and makes it difficult to meet the production requirements. Summary of the Invention

[0003] The present invention aims to provide a mold and process for multiple plastic molding to solve the above-mentioned problems in the prior art. To achieve the above-mentioned objective, the present invention provides the following technical solutions:

[0004] A first aspect of the present invention includes a first mold, a second mold, and a third mold, the first mold having a first cavity for injection molding a first part, the second mold having a mask cavity for masking the first part and a second cavity for injection molding a second part, the third mold having a positioning cavity for placing the first part and the second part, and a third cavity for injection molding a third part, the positioning cavity communicating with the third cavity, and the plastic injected into the third cavity is a preform. A plastic that is later injected into a third cavity, which has a lower melting point than the plastics injected into the first and second cavities, does not melt and mix with the plastics previously injected into the first and second cavities, and does not chemically melt and mix the plastics of the first and second cavities due to the chemical properties of the material injected into the third cavity, thereby providing a multiple plastic molding mold that maintains the independent integrity of each part so as to connect the third part together with the first and second parts.

[0005] In the embodiments of the present application, when three or more colors or materials are required to manufacture a single product, a first mold is first used to inject a first material into a first cavity to injection mold a first part, and then a second mold is used to mask the first part with a mask cavity to block communication between the second cavity and the first part, and then a second material is injected into the second cavity to injection mold the second part, thereby avoiding the risk of adhesive leakage or mutual dissolution during the injection molding process. After the first and second parts are molded, a third mold is used to inject a third material into a third cavity to injection mold the third part, thereby achieving the purpose of injection molding a single product with multiple colors and materials. (Accordingly, when producing three or more different types of parts, multiple molds with corresponding mask cavities can be prepared in sequence, area masking can be performed on the previously injection molded part, and then injection molding can be performed on the next part, thereby allowing multiple colors / multiple materials to be produced sequentially.) At the same time, since the positioning cavity communicates with the third cavity and the third part is integrally connected to the first and second parts after injection molding, the procedure of assembly after molding is omitted, thereby improving production efficiency, reducing production assembly costs and reject rates, and eliminating the need to adjust the assembly gaps between parts, making the gaps between each part zero, reducing the multiple coordination of the assembly gaps between parts, improving the sealing of the entire product, and making it suitable as a packaging process for some electronic circuits.

[0006] Furthermore, each of the molds includes an upper mold and a lower mold, and the cavity and the mask cavity are both provided between the upper mold and the lower mold.

[0007] In addition, the masking area of ​​the mask cavity is larger than the contour area of ​​the part to be masked. For irregular parts, the mask cavity may be provided with a regular shape, such as a cylinder or a rectangular parallelepiped, which is larger than the part, and not only simplifies the manufacturing requirements of the mold, but also facilitates the rapid implementation of the mask in the injection molding process and reduces the effort of alignment.

[0008] A second aspect of the present invention provides a process for multi-plastic molding using the above-described multi-plastic molding mold.

[0009] moreover, S1, injection molding a first part into a first cavity of a first mold; S2: Masking the first part in a first mask cavity of a second mold and injection molding the second part into the second cavity; S3, placing the first part and the second part in a first positioning cavity, and injection molding a third part into the third cavity to connect the third part to the first part and the second part together.

[0010] In addition, the plastic injected into the third cavity has a lower melting point than the plastic injected into the first cavity and the second cavity, and is incompatible with each other. Specifically, the different physical properties of the melting points of different plastics and their incompatible chemical properties allow each part to maintain its independent integrity, and achieve the movable function with a movable mechanism after injection molding, which is suitable for the production of products with multi-movable joints, and can also reduce the production cost of the mold.

[0011] The present invention has the beneficial effects of low production cost of the mold, simple process, suitable for manufacturing multi-color, multi-material and multi-joint products, and improving production efficiency and yield rate.

[0012] In the following, in order to more clearly explain the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly described. The drawings in the following description are only some embodiments of the present invention, and it is obvious to those skilled in the art that they can also obtain other drawings based on these drawings without creative labor. [Brief description of the drawings]

[0013] [Figure 1]FIG. 2 is a schematic diagram of a mold structure according to the first embodiment of the present invention. [Diagram 2] FIG. 2 is a structural schematic diagram of the product obtained in Example 1 of the present invention. [Diagram 3] FIG. 4 is a schematic diagram of a mold structure according to a second embodiment of the present invention. [Figure 4] FIG. 2 is a structural schematic diagram of the product obtained in Example 2 of the present invention. [Diagram 5] FIG. 11 is a schematic diagram of a joint rotation state of the product obtained in Example 2 of the present invention.

[0014] It should be noted that the drawings are not necessarily drawn to scale and are merely schematic representations that do not affect understanding. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Example 1: In the embodiment of the present application, as shown in Figures 1 and 2, a single product having five parts is manufactured, and five moulds A1, A2, A3, A4 and A5 are provided, in which a cavity 11 for part 1 is opened in the A1 mould, a cavity 21 for part 2 and a mask cavity 22 for part 1 are opened in the A2 mould, a cavity 31 for part 3 and a mask cavity 32 for parts 1 and 2 are opened in the A3 mould, a cavity 41 for part 4 and a mask cavity 42 for parts 1, 2 and 3 are opened in the A4 mould, and a cavity 51 for part 5 and a positioning cavity 52 for parts 1, 2, 3 and 4 are opened in the A5 mould, and the cavity 51 is connected to the positioning cavity 52.

[0016] The injection molding process is 1. Injection molding a part 1 into a cavity 11 of an A1 mold; 2. Masking part 1 with mask cavity 22 of A2 mold and injection molding part 2 into cavity 21 of A2 mold; 3. Masking part 1 and part 2 in a mask cavity 32 of an A3 mold, and injection molding part 3 into cavity 31 of the A3 mold; 4. Masking part 1, part 2 and part 3 with a mask cavity 42 of an A4 mold, and injection molding part 4 into cavity 41 of the A4 mold; Part 1, part 2, part 3 and part 4 are placed in positioning cavity 52, and part 5 is injection molded into cavity 51 of the A5 mold. When the injection molding is completed, part 1, part 2, part 3, part 4 and part 5 are connected together, and the entire assembly of the product can be achieved automatically.

[0017] Example 2: Five molds A6, A7, A8 and A9 are provided. In the embodiment of the present application, as shown in Figures 3 and 4, a single product having four parts is manufactured. Four molds A6, A7, A8 and A9 are provided. A cavity 61 for part 6 is opened in the A6 mold. A cavity 71 for part 7 and a mask cavity 72 for part 6 are opened in the A7 mold. A cavity 81 for part 8, a mask cavity 82 for part 7 and a positioning cavity 83 for part 6 are opened in the A8 mold. The cavity 81 is connected to the positioning cavity 83. A cavity 91 for part 9 and positioning cavities 92 for parts 6, 7 and 8 are opened in the A9 mold. The cavity 91 is connected to the positioning cavity 92.

[0018] The injection molding process is a. Injecting ABS-red plastic into cavity 61 of mold A6 to injection mold part 6; b. Masking part 6 with mask cavity 72 of A7 mold, and injecting PC-yellow plastic into cavity 71 of A7 mold to injection mold part 7; c. Masking part 7 with mask cavity 82 of A8 mold, injecting PA-blue plastic into cavity 81 of A8 mold, and injection molding part 8; when the injection molding is completed, part 6 and part 8 are connected to the movable joint mechanism; masking part 6, part 7 and part 8 with mask cavity 92 of A9 mold; injecting POM green plastic into cavity 91 of A9 mold; and injection molding part 9; when injection molding is completed, part 6, part 7, part 8 and part 9 are connected together to automatically achieve the overall assembly of the product; and part 7 and part 9, part 9 and part 8 are connected to the movable joint mechanism.

[0019] In this embodiment, ABS-red plastic, PC-yellow plastic, PA-blue plastic and POM-green plastic are illustratively selected for injection molding, and other materials may be selected in other embodiments. As long as the material injected later has a lower melting point than the material injected earlier for two contacting parts and is not compatible with each other, the same technical effect can be achieved, and adjacent parts will not melt or be compatible with each other, ensuring the independent integrity of each part.

[0020] It should be noted that, regarding the embodiments of the present invention, new embodiments can be obtained by combining the embodiments of the present invention and the features of the embodiments with each other to the extent that no contradiction occurs.

[0021] Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and is covered by the scope of protection of the present invention as set forth in the claims. The present invention has been disclosed above by the preferred embodiment, but does not limit the present invention, and those skilled in the art can make some changes or modifications according to the technical content disclosed above as equivalents of equivalent changes without departing from the scope of the technical solution of the present invention, but any simple modifications, equivalent changes and modifications made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention all belong to the scope of the technical solution of the present invention. [Explanation of symbols]

[0022] A1 A1 mold A2 A2 mold A3 A3 mold A4 A4 mold A5 A5 mold A6 A6 mold A7 A7 mold A8 A8 mold A9 A9 mold 1 Part 1 2 Part 2 3. Part 3 4 Part 4 5 Part 5 6 Part 6 7 Part 7 8 Parts8 9 Parts9 11 Cavity 21 Cavity 22 Mask Cavity 31 Cavity 32 Mask Cavity 41 Cavity 42 Mask Cavity 51 Cavity 52 Positioning cavity 61 Cavity 71 Cavity 72 Mask Cavity 81 Cavity 82 Mask Cavity 83 Positioning cavity 91 Cavity 92 Positioning cavity

Claims

1. A mold for multiple plastic molding, comprising: a first mold having a first cavity for injection molding a first part; a second mold having a mask cavity for masking the first component and a second cavity for injection molding the second component; a third mold having positioning cavities for placing the first part and the second part and a third cavity for injection molding the third part; A mold for molding multiple plastics, characterized in that the positioning cavity is connected to the third cavity, and the plastic injected into the third cavity has a lower melting point than the plastics injected into the first and second cavities and is incompatible with each other, thereby connecting the third part together with the first and second parts.

2. 2. The mold for molding multiple plastics according to claim 1, wherein the molds each include an upper mold and a lower mold, and the cavity and the mask cavity are both disposed between the upper mold and the lower mold.

3. 3. The mold for molding multiple plastics according to claim 2, wherein the masking area of ​​the mask cavity is larger than the contour area of ​​the part to be masked.

4. A multi-plastic molding process, characterized in that the mold for multi-plastic molding according to any one of claims 1 to 4 is used.

5. S1, injection molding a first part into a first cavity of a first mold; S2: Masking the first part in a first mask cavity of a second mold and injection molding the second part in the second cavity; S3: placing the first part and the second part in a first positioning cavity, and injection molding a third part into the third cavity, so that the third part is connected to the first part and the second part; 5. The process of claim 4, further comprising:

6. 6. The process of claim 5, wherein the plastic injected into the third cavity has a lower melting point than the plastics injected into the first and second cavities and are incompatible with each other.

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