CN102922756A - Element and method for manufacturing the same - Google Patents

Abstract

The invention discloses an element and a manufacturing method thereof, wherein a first ejection part and a second ejection part are respectively formed by secondary ejection. The first ejection member has a top wall and a first side wall connecting the periphery of the top wall. The second injection member has a second sidewall, an extension wall and a connecting wall connecting the second sidewall and the extension wall, wherein a first joint surface is arranged between the first sidewall and the second sidewall, and a second joint surface is arranged between the first sidewall and the connecting wall. The first joint surface and the second joint surface form an acute angle, and the first ejection piece and the second ejection piece are jointed into a whole at the first joint surface and the second joint surface. The element and the manufacturing method thereof provided by the invention can enable the element to have better appearance quality.

Description

Components and their manufacturing methods

technical field

The present invention relates to a component and a manufacturing method thereof, and in particular to a component having a first injection part and a second injection part and a method for manufacturing the above-mentioned component by secondary injection.

Background technique

In today's information society, human beings are increasingly dependent on consumer products. For example, computers, mobile phones, cars, etc. can be seen everywhere in the surrounding life. Therefore, these consumer products have an inseparable relationship with the daily life of modern people. Various manufacturers are actively designing products with gorgeous appearance and manufacturing high-quality products to attract consumers. Invisibly, consumers' loyalty to each manufacturer will establish a good reputation based on the product appearance and product quality of the manufacturer.

FIG. 1 is a schematic cross-sectional view of a conventional device. Referring to FIG. 1 , the interior of the element 10 has an acute angle A, and the exterior of the element 10 has a shape corresponding to the acute angle A. Referring to FIG. When the male die (not shown) of the mold and the female die (not shown) of the mold were demolded along a demoulding direction (for example, the up and down direction of FIG. The structure 12 interferes, and the product cannot be demolded smoothly. Again, when the male mold (not shown) of the mold and the female mold (not shown) of the mold are demoulded along another demoulding direction (for example, the left-right direction of Fig. 1), although the product can be demoulded smoothly, but Element 10 will be divided into two pieces. After the two pieces are combined, there will be traces of bonding on the appearance surface 10a of the element 10, which will cause damage to the appearance surface 10a of the product. Therefore, how to keep the original appearance design of the product and the requirement of releasing the mold is a problem to be solved by those skilled in the art.

Contents of the invention

The present invention provides an element, the first and second injection parts of which are integrated at the first joint surface and the second joint surface, so that the appearance has better appearance quality.

The invention provides a manufacturing method of an element, which can effectively avoid the phenomenon that the element cannot be released from the mold during the manufacturing process, and make the element have better appearance quality.

The present invention proposes a component including a first ejection part and a second ejection part. The first ejector has a top wall and a first side wall connected to the periphery of the top wall. The second ejector has a second side wall, an extension wall and a connecting wall connecting the second side wall and the extension wall, wherein there is a first joint surface between the first side wall and the second side wall, and the first side wall and the second side wall are connected. There is a second joint surface between the connecting walls. The first joint surface and the second joint surface form an acute angle, and the first injection part and the second injection part are joined together on the first joint surface and the second joint surface.

The present invention proposes a manufacturing method of an element, which includes the following steps: first, injection molding a first injection part, wherein the first injection part has a top wall and a first side wall connected to the periphery of the top wall. Then injection molding a second injection part on the first injection part. The second ejector has a second side wall, an extension wall and a connection wall connecting the second side wall and the extension wall. There is a first joint surface between the first side wall and the second side wall, and there is a second joint surface between the first side wall and the connecting wall. The first joint surface and the second joint surface form an acute angle, and the first injection part and the second injection part are joined together on the first joint surface and the second joint surface.

In an embodiment of the device of the present invention, the material of the above-mentioned first injection part is the same as that of the second injection part.

In an embodiment of the device of the present invention, the material of the above-mentioned first injection part is different from the material of the second injection part.

In an embodiment of the device of the present invention, the material of the first injection part and the second injection part are plastic or rubber.

In an embodiment of the device of the present invention, the above-mentioned first ejector has a maximum thickness and a minimum thickness, and the maximum thickness of the first ejector is at most 1.4 times the minimum thickness of the first ejector.

In an embodiment of the device of the present invention, the above-mentioned second ejector has a maximum thickness and a minimum thickness, and the maximum thickness of the second ejector is at most 1.4 times the minimum thickness of the second ejector.

In an embodiment of the element of the present invention, the structure of the above-mentioned first injection member is a trapezoidal structure.

In the manufacturing method of the device of the present invention, the above-mentioned first injection part has a maximum thickness and a minimum thickness, and the maximum thickness of the first injection part can be at most 1.4 times of the minimum thickness of the first injection part.

In the manufacturing method of the device of the present invention, the above-mentioned second injection part has a maximum thickness and a minimum thickness, and the maximum thickness of the second injection part can be at most 1.4 times of the minimum thickness of the second injection part.

Based on the above, in the above-mentioned embodiment of the present invention, the first injection part is injection-molded first, and then the second injection part is injected to form an acute-angle joint surface, and the first injection part and the second injection part meet at this acute-angle joint surface. Integrate into one body so that the components have better appearance quality.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a conventional device.

FIG. 2A to FIG. 2B are schematic flowcharts of an element and its manufacturing method according to an embodiment of the present invention.

Fig. 3 is a perspective view of the element of Fig. 2B.

Reference signs:

10, 100: components

10a: Appearance surface

12: Protruding structure

110: The first injection part

112: top wall

114: first side wall

120: Second injection part

122: Second side wall

124: Extended Wall

126: connecting wall

A: acute angle

S1: first joint surface

S2: Second joint surface

Detailed ways

2A to 2B are schematic flowcharts of a device and a manufacturing method thereof according to an embodiment of the present invention. Fig. 3 is a perspective view of the element of Fig. 2B. Please refer to FIG. 2A to FIG. 2B and FIG. 3 , in this embodiment, firstly, the first injection part 110 is injection molded, wherein the first injection part 110 has a top wall 112 and a first side wall 114 connecting the top wall 112 around. Then injection molding a second injection part 120 on the first injection part 110 . The second ejector 120 has a second side wall 122 , an extension wall 124 and a connecting wall 126 connecting the second side wall 122 and the extension wall 124 . There is a first joint surface S1 between the first side wall 114 and the second side wall 122 , and there is a second joint surface S2 between the first side wall 114 and the connecting wall 126 . The first joint surface S1 and the second joint surface S2 form an acute angle A, and the first injection part 110 and the second injection part 120 are joined together on the first joint surface S1 and the second joint surface S2 to form the element 100 (such as Figure 3).

In detail, after the mold (not shown) of the element 100 is installed in the secondary injection molding machine (not shown), the molten material of the first injection part 110 is first injected into the mold cavity (not shown) of the mold. ) to form a first ejector 110 having a top wall 112 and a first side wall 114 , wherein the structure of the first ejector 110 presents a trapezoidal structure. Next, the material of the molten second injection part 120 is injected into the mold cavity of the mold and wrapped around the first side wall 114 to form a second side wall 122 , an extension wall 124 and a connecting wall 126 . Injection part 120 . When the second ejector 120 is in contact with the first ejector 110, part of the material of the first side wall 114 and part of the material of the second side wall 122 are fused with each other to form the first joint surface S1 and part of the first side wall. The material of 114 and part of the material of the connecting wall 126 are fused together to form the second joint surface S2 , and the two joint surfaces (the first joint surface S1 and the second joint surface S2 ) form a joint surface with an acute angle A. After the material of the first injection part 110 and the material of the second injection part 120 are cooled, the first joint surface S1 and the second joint surface S2 join the first injection part 110 and the second injection part 120, and the acute angle A is partly The material of the side wall 114 is filled with a part of the material of the second side wall 122 and a part of the material of the connecting wall 126 . Thereby, no sharp-angle structure is generated inside the component 100, so as to prevent the mold from being unable to escape along the demoulding direction (eg, the up-and-down direction in FIG. 2B ). Moreover, the element 100 can be manufactured directly by integral molding, and the outer surface of the element 100 still maintains a smooth surface without seam traces, so that the element 100 has better appearance quality.

In addition, the material of the first injection part 110 and the second injection part 120 in this embodiment may be the same, wherein the materials are, for example, the same plastic or the same rubber. Since the same material has the same melting temperature, after the first injection part 110 is in contact with the second injection part 120, the material with a higher melting temperature can be prevented from affecting another material with a lower melting temperature, causing the component 100 produces deformation problems.

Based on the above, in addition, when the component 100 needs to meet part of the product performance, for example, the exterior of the component 100 has surface treatment or the interior of the component 100 reduces residual stress, the material of the first injection part 110 and the material of the second injection part 120 The materials can also be different, where the materials are, for example, all different plastics or both different rubbers. It should be noted that since different materials have different melting temperatures, the material with higher melting temperature needs to be injected into the cavity of the mold first to form the first injection part 110 . However, the present invention does not limit whether the material of the first injection part 110 and the second injection part 120 are the same, and the user can adjust it according to actual needs.

Considering that in the past, the product used one injection and after the product cooled, the surface of the product may often sink due to the uneven thickness of the product (commonly known as shrinkage). To solve the shrinkage problem, the maximum thickness and minimum thickness of the product may have to be at least The difference is 1.4 times. For example, if the thinnest part of the product is 10mm, the thickest part of the product can only be 14mm. Accordingly, it may be necessary to change the shape of the product to solve the shrinkage problem, or change the mold structure to solve the shrinkage problem. However, when the product changes its shape, it loses the shape of the original design, or when the mold changes its structure, the mold structure is complicated and is not conducive to maintenance.

Therefore, in order to solve the above-mentioned problems, another advantage of the present invention is that components with extremely uneven thickness can be divided into multiple injections. Further, in this embodiment, the first injection member 110 or the second injection member 120 may have a maximum thickness (not shown) and a minimum thickness (not shown). The maximum thickness of the first injection part 110 may be at most 1.4 times the minimum thickness of the first injection part 110 , or the maximum thickness of the second injection part 120 may be at most 1.4 times the minimum thickness of the second injection part 120 . When the component 100 uses secondary injection molding, the difference between the maximum thickness and the minimum thickness of the thickness of the first injection part 110 or the second injection part 120 each time is within the allowable range of 1.4 times, so after the component 100 is cooled, There will be no shrinkage issues.

To sum up, the present invention uses secondary injection to manufacture the first injection part and the second injection part. After the material of the first injection part and the material of the second injection part are cooled, the first bonding surface and the second bonding surface are bonded to the second injection part. An injection part and a second injection part, and the acute angle is filled by part of the material of the first side wall, part of the material of the second side wall and part of the material of the connecting wall. As a result, no sharp angles are created inside the element, so that the mold cannot be released along the demolding direction. Furthermore, the component can be manufactured directly by integral molding without affecting the external surface of the component, so that the component has better appearance quality. In addition, when the component uses secondary injection, the first injection part or the second injection part can have a maximum thickness and a minimum thickness, and the maximum thickness of the first injection part or the second injection part can be at most the first injection part. 1.4 times the minimum thickness of the part or the second shot part. Therefore, after the components cool down, the problem of shrinkage can be avoided.

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention, and any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention.

Claims (10)

1. A component comprising: A first ejector has a top wall and a first side wall connected to the periphery of the top wall; and A second ejector has a second side wall, an extension wall and a connection wall connecting the second side wall and the extension wall, wherein a first side wall and the second side wall have a first joint surface, and there is a second joint surface between the first side wall and the connecting wall, the first joint surface and the second joint surface form an acute angle, and the first injection part and the second injection part are in the The first joint surface is jointed with the second joint surface as a whole. 2. The component according to claim 1, wherein the material of the first ejection part is the same as that of the second ejection part. 3. The device according to claim 1, wherein the material of the first ejection part is different from the material of the second ejection part. 4. The component according to any one of claims 1-3, wherein the material of the first injection part and the material of the second injection part are plastic or rubber. 5. The device according to claim 1, wherein the first ejector has a maximum thickness and a minimum thickness, and the maximum thickness of the first ejection is at most 1.4 of the minimum thickness of the first ejection times. 6. The device according to claim 1, wherein the second ejector has a maximum thickness and a minimum thickness, and the maximum thickness of the second ejection is at most 1.4 times the minimum thickness of the second ejection . 7. The device according to claim 1, wherein the structure of the first ejector is a trapezoidal structure. 8. A method of manufacturing a component, comprising: Injection molding a first injection part, wherein the first injection part has a top wall and a first side wall connected to the periphery of the top wall; and Injection molding a second injection part on the first injection part, the second injection part has a second side wall, an extension wall and a connecting wall connecting the second side wall and the extension wall, the first side There is a first joint surface between the wall and the second side wall, and there is a second joint surface between the first side wall and the connecting wall, and an acute angle is formed between the first joint surface and the second joint surface, And the first injection part and the second injection part are integrally joined at the first joint surface and the second joint surface. 9. The manufacturing method of the device according to claim 8, wherein the first injection part has a maximum thickness and a minimum thickness, and the maximum thickness of the first injection part can be at most the minimum thickness of the first injection part 1.4 times the thickness. 10. The manufacturing method of the device according to claim 8, wherein the second injection part has a maximum thickness and a minimum thickness, and the maximum thickness of the second injection part can be at most the minimum thickness of the first injection part 1.4 times the thickness.

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