Injection mold and injection molding workpiece

Abstract

The utility model relates to the technical field of injection molding, in particular to an injection mold and an injection molding workpiece. The injection mold provided by the utility model is used for integrally injecting an injection molding workpiece on a metal device, the injection mold comprises a mold body, a mold cavity is arranged in the mold body, the metal device can be placed in the mold cavity, and the mold cavity is used for filling a sizing material which is solidified to form the injection molding workpiece. And the inner side wall of the mold cavity is obliquely arranged towards the interior of the mold cavity in the mold pulling direction. According to the injection molding tool, when the mold cavity is filled with a sizing material, the sizing material can flow to a wider area at the bottom under the action of the gravity of the sizing material, so that the sizing material starts to be filled from the bottom of the mold cavity, gas in the mold cavity is compressed to the upper side and then is discharged from the parting surface of the mold body, and the problem of weld marks of an injection molding workpiece is effectively solved; and the injection mold is simple in structure and low in cost. The injection molding workpiece is integrally injection-molded on the metal device by adopting the injection mold, so that the problem of weld marks of the injection molding workpiece is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to an injection mold and an injection molding workpiece. Background Art

[0002] Injection molds are important process equipment for producing various industrial products. With the rapid development of the plastics industry, the scope of application of injection molds is becoming more and more extensive. Injection molds are a tool for producing plastic products, and are also a tool for giving plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to the injection of heated and melted rubber into the mold cavity of the injection mold by the injection molding machine under high pressure, and after cooling and solidification, the injection molded workpiece is obtained.

[0003] In the prior art, when the rubber is injected into the mold cavity of the injection mold by the injection molding machine under high pressure, the rubber is generally filled into the middle area of ​​the mold cavity from both the upper and lower directions in the mold cavity, which easily seals the gas in the mold cavity in the middle part of the mold cavity and cannot be discharged smoothly, resulting in the formation of weld marks on the obtained injection molded workpiece. In the related art, the weld mark problem is usually improved by adjusting the injection method of the rubber, or adjusting the temperature, pressure and injection speed during injection, which not only makes the structure complicated and increases the cost, but also fails to effectively improve the weld mark problem of the injection molded workpiece.

[0004] Therefore, there is an urgent need for an injection mold and an injection molded workpiece to solve the above problems. Utility Model Content

[0005] The utility model aims to provide an injection mold and an injection molded workpiece to improve the problem of weld marks of the injection molded workpiece, and the injection mold has a simple structure and low cost.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] An injection mold, the injection mold is used to integrally inject a molded workpiece onto a metal device, the injection mold comprising:

[0008] A mold body, wherein a mold cavity is arranged inside the mold body, the metal device can be placed in the mold cavity, the mold cavity is used to fill and solidify the rubber material to form the injection molded workpiece, and the inner side wall of the mold cavity is inclined toward the inside of the mold cavity along the demolding direction.

[0009] Since the inner wall of the mold cavity is tilted toward the inside of the mold cavity along the demolding direction, when the metal device is placed in the mold cavity and the rubber is injected into the mold cavity, the rubber will flow to the wider area at the bottom of the mold cavity under the action of its own gravity, so that the rubber starts to fill from the bottom of the mold cavity, thereby compressing the gas in the mold cavity to the top and then discharged from the parting surface of the mold body, improving the problem of poor gas exhaust in the mold cavity during glue injection, thereby effectively improving the problem of weld marks of the injection molded workpiece and ensuring the quality of the injection molded workpiece. In addition, the problem of weld marks of the injection molded workpiece can be improved by tilting the inner wall of the mold cavity toward the inside of the mold cavity along the demolding direction, without adjusting the temperature, pressure and injection speed during glue injection, so that the structure of the injection mold is simple and the cost is low.

[0010] As an optional solution, the inclination angle of the inner side wall of the mold cavity is α, and α is 0.5° to 2°.

[0011] As an alternative, it is characterized in that α is 1°.

[0012] The numerical limit of the above-mentioned inclination angle α not only ensures that the injected rubber material starts to fill the mold cavity from the bottom, but also ensures smooth demoulding of the injection molded workpiece.

[0013] As an optional solution, a glue inlet communicating with the mold cavity is provided on the side wall of the mold body, and the center of the glue inlet is located below half the height of the molded workpiece formed by injection molding in the mold cavity.

[0014] The rubber material filled in the mold cavity is injected into the mold cavity through the glue inlet. Since the glue inlet is located below half the height of the injection molded workpiece in the mold cavity, the rubber material injected into the mold cavity is more likely to flow to the bottom of the mold cavity under the action of its own gravity, further ensuring that the rubber material starts to be filled from the bottom of the mold cavity.

[0015] As an optional solution, the height of the molded workpiece formed by injection molding in the mold cavity is h, and the vertical distance from the center position of the glue inlet to the lower end surface of the molded workpiece formed by injection molding in the mold cavity is b, then b is 1 / 3h to 2 / 5h.

[0016] The above numerical limits ensure that the position of the glue inlet is below half the height of the injection molded workpiece in the mold cavity, and further ensure that the glue injected into the mold cavity flows to the bottom of the mold cavity under the action of its own gravity, so that the glue starts to fill the mold cavity from the bottom.

[0017] As an alternative, b is 0.35h.

[0018] As an alternative, b is 0.38h.

[0019] An injection-molded workpiece is integrally injection-molded on a metal device using the injection mold as described above.

[0020] The injection molded workpiece is integrally injection molded on the metal device by using the injection mold, which effectively improves the problem of weld marks on the injection molded workpiece and ensures the quality of the injection molded workpiece.

[0021] As an optional solution, the injection molded workpiece is a thin-walled part, and along the radial direction of the injection molded workpiece, the horizontal distance d between the outermost side wall of the injection molded workpiece and the outermost side wall of the metal component is not greater than 0.3 mm.

[0022] As an optional solution, the injection molded workpiece is a rubber ring.

[0023] Beneficial effects of the utility model:

[0024] The utility model provides an injection mold, which is used to integrally mold a molded workpiece onto a metal device. The injection mold includes a mold body, a mold cavity is arranged inside the mold body, the metal device can be placed in the mold cavity, and the inner side wall of the mold cavity is inclined toward the inside of the mold cavity along the demolding direction. Since the inner side wall of the mold cavity is inclined toward the inside of the mold cavity along the demolding direction, when the rubber is filled into the mold cavity, the rubber will flow to a wider area at the bottom of the mold cavity under the action of its own gravity, so that the rubber starts to fill from the bottom of the mold cavity, thereby compressing the gas in the mold cavity to the top, and then discharged from the parting surface of the mold body, improving the problem of poor gas exhaust in the mold cavity during glue injection, thereby effectively improving the problem of weld marks of the injection molded workpiece. In addition, the problem of weld marks of the injection molded workpiece can be improved by making the inner side wall of the mold cavity inclined toward the inside of the mold cavity along the demolding direction, so that the structure of the injection mold is simple and the cost is low.

[0025] The utility model also provides an injection molded workpiece. The injection molded workpiece provided by the utility model is integrally molded on a metal device by using the injection mold, thereby effectively improving the problem of weld marks of the injection molded workpiece and ensuring the quality of the injection molded workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a top view of an injection mold processing an injection molded workpiece provided by an embodiment of the utility model;

[0027] Figure 2 It is a structural cross-sectional view of an injection mold processing an injection molded workpiece provided by an embodiment of the utility model;

[0028] Figure 3 It is a structural cross-sectional view of a metal device placed in a mold cavity of an injection mold provided by an embodiment of the utility model;

[0029] Figure 4 yes Figure 2 A magnified view of the structure at center A;

[0030] Figure 5 This is a cross-sectional view of a structure in which an injection molded workpiece is integrally molded on a metal device according to an embodiment of the utility model. Figure 1 ;

[0031] Figure 6 This is a cross-sectional view of a structure in which an injection molded workpiece is integrally molded on a metal device according to an embodiment of the utility model. Figure 2 .

[0032] In the figure:

[0033] 10. Mold body; 11. Mold cavity; 12. Inner wall; 13. Glue inlet; 20. Metal parts; 30. Injection molded workpiece. DETAILED DESCRIPTION

[0034] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] Injection molds are important process equipment for producing various industrial products. With the rapid development of the plastics industry, the scope of application of injection molds is becoming more and more extensive. Injection molds are a tool for producing plastic products, and are also tools that give plastic products complete structures and precise dimensions. Injection molding is a processing method used in the mass production of certain parts with complex shapes. Specifically, it refers to the high-pressure injection of heated and melted rubber into the mold cavity of the injection mold by the injection molding machine, and after cooling and solidification, the injection molded workpiece is obtained. In the prior art, when the rubber is injected into the mold cavity of the injection mold by the injection molding machine under high pressure, the rubber is generally filled into the middle area of ​​the mold cavity from both the upper and lower directions in the mold cavity, which is easy to seal the gas in the mold cavity in the middle part of the mold cavity and cannot be effectively discharged, resulting in the formation of weld marks on the obtained injection molded workpiece. In the related art, the weld mark problem is usually improved by adjusting the glue feeding method of the rubber, or adjusting the temperature, pressure and injection speed during the injection, which not only makes the structure complicated and increases the cost, but also cannot effectively improve the weld mark problem of the injection molded workpiece.

[0039] In order to solve the above problems, Figure 1 to Figure 4 As shown, the present embodiment provides an injection mold, and the injection mold provided in the present embodiment is used to integrally inject a molded workpiece 30 onto a metal device 20. The injection mold provided in the present embodiment includes a mold body 10, and a mold cavity 11 is arranged inside the mold body 10. The metal device 20 can be placed in the mold cavity 11, and the mold cavity 11 is used to fill and solidify the rubber material to form the injection molded workpiece 30, and the inner side wall 12 of the mold cavity 11 is inclined toward the inside of the mold cavity 11 along the demolding direction. Since the inner side wall 12 of the mold cavity 11 is tilted toward the inside of the mold cavity 11 along the demolding direction, when the metal device 20 is placed in the mold cavity 11 and the rubber is injected into the mold cavity 11, the rubber will flow to the wider area at the bottom of the mold cavity 11 under the action of its own gravity, so that the rubber starts to fill from the bottom of the mold cavity 11, thereby compressing the gas in the mold cavity 11 to the top and then discharged from the parting surface of the mold body 10, thereby improving the problem of poor gas exhaust in the mold cavity 11 during glue injection, thereby effectively improving the problem of weld marks of the injection molded workpiece 30 and ensuring the quality of the injection molded workpiece 30. In addition, the problem of weld marks of the injection molded workpiece 30 can be improved by tilting the inner side wall 12 of the mold cavity 11 toward the inside of the mold cavity 11 along the demolding direction, so that the structure of the injection mold is simple and the cost is low.

[0040] It should be noted that the demolding direction is from the bottom of the mold cavity 11 to the top of the mold cavity 11, that is, the inner side wall 12 of the mold cavity 11 is inclined from the bottom of the mold cavity 11 to the top of the mold cavity 11 toward the inside of the mold cavity 11, so that the rubber first flows along the inner side wall 12 to the bottom of the mold cavity 11, and then the rubber gradually fills upward from the bottom of the mold cavity 11. In addition, it should be noted that in the prior art, in order to facilitate the removal of the injection molded workpiece 30 in the mold cavity 11, the inner side wall 12 of the mold cavity 11 is usually inclined from the bottom of the mold cavity 11 to the top of the mold cavity 11 toward the outside of the mold cavity 11, which further aggravates the problem of the weld mark of the injection molded workpiece 30. The present embodiment improves the problem of the weld mark of the injection molded workpiece 30 by changing the inclination direction of the inner side wall 12, and has a simple structure, low cost, and little modification relative to the existing injection mold.

[0041] Optionally, in this embodiment, the mold body 10 may be composed of an upper mold and a lower mold assembled together, and the upper mold and the lower mold assembled together form a mold cavity 11 in the mold body 10 .

[0042] Optionally, in the present embodiment, the inclination angle of the inner side wall 12 of the mold cavity 11 is α, and α is 0.5° to 2°. Specifically, the inclination angle α of the inner side wall 12 of the mold cavity 11 can be 0.5°, 0.6°, 0.7°, 0.8°, 0.9°, 1°, 1.1°, 1.2°, 1.3°, 1.4°, 1.5°, 1.6°, 1.7°, 1.8°, 1.9° or 2°. The numerical limit of the above inclination angle α not only ensures that the injected rubber material starts to fill from the bottom of the mold cavity 11, but also ensures the smooth demolding of the injection molded workpiece 30. Preferably, in the present embodiment, α is 1°.

[0043] In this embodiment, if Figure 4 As shown, a glue inlet 13 connected to the mold cavity 11 is provided on the side wall of the mold body 10, and the center of the glue inlet 13 is located below half the height of the injection molded workpiece 30 formed by injection molding in the mold cavity 11. The glue filled in the mold cavity 11 is injected into the mold cavity 11 through the glue inlet 13. Since the center of the glue inlet 13 is located below half the height of the injection molded workpiece 30 in the mold cavity 11, the glue injected into the mold cavity 11 is more likely to flow to the bottom of the mold cavity 11 under the action of its own gravity, further ensuring that the glue is filled from the bottom of the mold cavity 11.

[0044] In this embodiment, the height of the molded workpiece 30 formed by injection molding in the mold cavity 11 is h, and the vertical distance from the center position of the glue inlet 13 to the lower end surface of the molded workpiece 30 formed by injection molding in the mold cavity 11 is b, then b is 1 / 3h to 2 / 5h. The above numerical value limitation ensures that the center position of the glue inlet 13 is located below half the height of the molded workpiece 30 in the mold cavity 11, and further ensures that the glue injected into the mold cavity 11 flows to the bottom of the mold cavity 11 under the action of its own gravity, so that the glue starts to fill from the bottom of the mold cavity 11. Optionally, in this embodiment, b can be 1 / 3h, 0.3h, 0.32h, 0.35h, 0.37h, 0.38h or 0.4h (i.e. 2 / 5h).

[0045] like Figure 5 and Figure 6 As shown, this embodiment further provides an injection molded workpiece 30, and the injection molded workpiece 30 provided in this embodiment is integrally molded on the metal device 20 using the above-mentioned injection mold. The injection molded workpiece 30 provided in this embodiment is integrally molded on the metal device 20 using the above-mentioned injection mold, which effectively improves the problem of weld marks of the injection molded workpiece 30 and ensures the quality of the injection molded workpiece 30.

[0046] Optionally, in the present embodiment, the injection molded workpiece 30 may be a thin-walled part, and along the radial direction of the injection molded workpiece 30, the horizontal spacing d between the outermost side wall of the injection molded workpiece 30 and the outermost side wall of the metal device 20 is not greater than 0.3 mm, but it is not limited thereto, and the injection molded workpiece 30 may also be a workpiece of other forms. It should be noted that even if the injection molded workpiece 30 is a thin-walled part, the problem of the weld mark of the injection molded workpiece 30 is effectively improved. Optionally, in the present embodiment, the injection molded workpiece 30 may be an injection molded rubber ring, and the metal device 20 may be a hardware part.

[0047] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An injection mold, characterized in that: The injection mold is used to integrally mold an injection molded workpiece (30) onto a metal device (20), and the injection mold comprises: A mold body (10), wherein a mold cavity (11) is arranged inside the mold body (10), the metal device (20) can be placed in the mold cavity (11), the mold cavity (11) is used to fill and solidify the rubber material to form the injection molded workpiece (30), and the inner side wall (12) of the mold cavity (11) is inclined toward the inside of the mold cavity (11) along the demoulding direction.

2. The injection mold according to claim 1, characterized in that: The inclination angle of the inner side wall (12) of the mold cavity (11) is α, and α is 0.5° to 2°.

3. The injection mold according to claim 2, characterized in that: α is 1°.

4. The injection mold according to any one of claims 1 to 3, characterized in that: A glue inlet (13) connected to the mold cavity (11) is provided on the side wall of the mold body (10), and the center of the glue inlet (13) is located below half the height of the injection molded workpiece (30) formed by injection molding in the mold cavity (11).

5. The injection mold according to claim 4, characterized in that: The height of the molded workpiece (30) formed by injection molding in the mold cavity (11) is h, and the vertical distance from the center position of the glue inlet (13) to the lower end surface of the molded workpiece (30) formed by injection molding in the mold cavity (11) is b, and b is 1 / 3h to 2 / 5h.

6. The injection mold according to claim 5, characterized in that: b is 0.35h.

7. The injection mold according to claim 5, characterized in that: b is 0.38h.

8. An injection molded workpiece, characterized in that: The injection molded workpiece (30) is integrally injection molded on the metal device (20) using the injection mold described in any one of claims 1 to 7.

9. The injection molded workpiece according to claim 8, characterized in that: The injection molded workpiece (30) is a thin-walled workpiece, and along the radial direction of the injection molded workpiece (30), a horizontal spacing d between the outermost side wall of the injection molded workpiece (30) and the outermost side wall of the metal component (20) is no greater than 0.3 mm.

10. The injection molded workpiece according to claim 9, characterized in that: The injection molded workpiece (30) is a rubber ring.

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