Injection mold and manufacturing method of charging head

Abstract

The invention discloses an injection mold and a charging head manufacturing method, the injection mold comprises an upper mold and a lower mold, the upper mold comprises a seat body and an insert, the seat body is provided with a first molding surface, the first molding surface is provided with an accommodating hole, the insert is embedded in the accommodating hole, an insertion hole is formed in the insert, and the insertion hole is communicated with an orifice of the accommodating hole; the insertion holes are used for being connected with PINs in a pluggable mode, and the hardness value difference between the insert and the PINs is smaller than or equal to 15 Rockwell hardness; a second molding surface is arranged on the lower mold, and an injection molding cavity is formed between the second molding surface and the first molding surface. When the injection mold is split, the PINs are separated from the insert in the extending direction of the penetrating hole under the action of the shell so as to be separated from the upper mold, and the hardness value difference between the insert and the PINs is smaller than or equal to 15 Rockwell hardness, so that the possibility that the PINs are scratched by the insert in the separation process of the PINs and the insert is small, and the service life of the PINs is prolonged. By the adoption of the injection mold, the possibility that the PINs are scratched can be reduced.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to an injection mold with in-mold insert protection and a method for manufacturing a charging head with PIN pin injection molding. Background Technology

[0002] Conventional in-mold injection molding of charging head pins typically involves directly inserting the pins into the mold by machining through holes in the mold steel. However, the mold steel is much harder than the surface of the pins themselves. Friction occurs between the two during assembly, and from a mechanical perspective, the softer surface of the pins will result in scratches and other defects. Increasing the clearance between the pins and the mold can avoid this scratching problem. However, increasing the clearance can lead to plastic sealant overflow. Therefore, making the clearance too large is not feasible. Conversely, reducing the clearance will cause friction and scratches on the pin surface. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the first aspect of the present invention provides an injection mold capable of reducing the possibility of scratches.

[0004] A second aspect of the present invention also provides a method for manufacturing an injection mold and a charging head.

[0005] According to a first aspect of the present invention, an injection mold includes an upper mold and a lower mold. The upper mold includes a base and an insert. The base has a first molding surface and a receiving hole. The insert is embedded in the receiving hole and has a through hole formed therein. The through hole communicates with the opening of the receiving hole and is used for insertion and removal connection with a pin. The hardness difference between the insert and the pin is less than or equal to 15 Rockwell hardness. The lower mold has a second molding surface and an injection cavity is formed between the second molding surface and the first molding surface.

[0006] An injection mold according to a first aspect embodiment of the present invention has at least the following technical effects: In the use of the injection mold of this application, the PIN pin is inserted into the insertion hole of the insert and connected to the insert. The upper mold and the lower mold are then closed. At this time, an injection cavity is formed between the first molding surface of the upper mold and the second molding surface of the lower mold. The PIN pin portion is located in the injection cavity. Then, injection molding is performed into the injection cavity to form a shell within the injection cavity, and the shell is connected to the portion of the PIN pin located in the injection cavity. The shell and the PIN pin together constitute the charging head. Then, the upper mold and the lower mold are separated, and the formed charging head is removed. From the above usage process, it can be seen that when the injection mold of this application is separated, the PIN pin, under the action of the shell, detaches from the insert along the extension direction of the insertion hole to detach from the upper mold. Since the hardness difference between the insert and the PIN pin is less than or equal to 15 Rockwell hardness, the possibility of the insert scratching the PIN pin during the separation process is small. Therefore, the injection mold of this application can reduce the possibility of PIN pin scratching.

[0007] According to an embodiment of the first aspect of the present invention, in an injection mold, the wall of the receiving hole near the first molding surface is inwardly contracted to form a contracted portion, an insert abuts against the end face of the contracted portion away from the first molding surface, and an clearance gap is formed between the insert and the first molding surface.

[0008] According to an embodiment of the first aspect of the present invention, the height h of the clearance space satisfies: 0.5mm≤h≤1mm.

[0009] According to an embodiment of the first aspect of the present invention, in an injection mold, the end face of the shrinkage portion facing away from the first molding surface is an annular guide slope.

[0010] According to a first aspect of the present invention, an injection mold is provided, wherein the insert is made of bronze.

[0011] According to an embodiment of the first aspect of the present invention, an injection mold has a receiving hole that penetrates the base body, and an installation opening that allows an insert to pass through is formed at the end of the receiving hole opposite to the first molding surface.

[0012] According to an embodiment of the first aspect of the present invention, an injection mold has a limiting protrusion on the insert and a stepped surface on the wall of the receiving hole near the mounting opening. The stepped surface abuts against the limiting protrusion to prevent the insert from approaching the first molding surface.

[0013] According to an embodiment of the first aspect of the present invention, the upper mold base further includes a limiting member, which is detachably connected to the base body. The limiting member is disposed at the mounting opening and is used to prevent the insert from disengaging from the receiving hole at the mounting opening.

[0014] According to a first aspect of the present invention, an injection mold has two receiving holes on a first molding surface, and an insert is provided in each receiving hole.

[0015] A method for manufacturing a charging head according to a second aspect of the present invention, applied to an injection mold as described in the above embodiment, the method comprising the following steps: Insert the two pins into the insertion holes of the two inserts respectively; The upper mold and the lower mold are closed to form an injection cavity between the first molding surface and the second molding surface, wherein the PIN pin portion is located inside the injection cavity; Injection molding is performed into the injection cavity to form a shell within the injection cavity, and the shell is connected to the portion of the PIN pin located within the injection cavity. The shell and the PIN pin together constitute the charging head. Separate the upper and lower molds and remove the resulting charging head.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of an injection mold according to one embodiment of the present invention; Figure 2 for Figure 1 A magnified view of region A shown in the image; Figure 3 This is a flowchart illustrating a method for manufacturing a charging head according to one embodiment of the present invention.

[0018] Figure label: Upper mold 100, base 110, receiving hole 110a, mounting port 110b, first forming surface 111, shrinkage part 112, guide slope 112a, clearance space 113, stepped surface 114, insert 120, through hole 120a, limiting protrusion 121; Lower mold 200, second forming surface 210; PIN pin 300. Detailed Implementation

[0019] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, left, right, front, back, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0022] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0023] The following is for reference. Figure 1 and Figure 2 A first aspect embodiment of the present invention will be described in detail.

[0024] refer to Figure 1 and Figure 2 According to a first aspect of the present invention, an injection mold includes an upper mold 100 and a lower mold 200. The upper mold 100 includes a base 110 and an insert 120. The base 110 is provided with a first molding surface 111 and a receiving hole 110a. The insert 120 is embedded in the receiving hole 110a and has a through hole 120a formed therein. The through hole 120a communicates with the opening of the receiving hole 110a and is used for insertion and removal connection with a PIN pin 300. The hardness difference between the insert 120 and the PIN pin 300 is less than or equal to 15 Rockwell hardness. The lower mold 200 is provided with a second molding surface 210, and an injection cavity is formed between the second molding surface 210 and the first molding surface 111.

[0025] In the process of using the injection mold of this application, the PIN pin 300 is inserted into the insertion hole 120a of the insert 120 and connected to the insert 120. The upper mold 100 and the lower mold 200 are closed. At this time, an injection cavity is formed between the first molding surface 111 of the upper mold 100 and the second molding surface 210 of the lower mold 200. The PIN pin 300 is partially located in the injection cavity. Then, injection molding is performed into the injection cavity to form a shell in the injection cavity and connect the shell with the part of the PIN pin 300 located in the injection cavity. The shell and the PIN pin 300 together constitute the charging head. Then, the upper mold 100 and the lower mold 200 are separated and the formed charging head is taken out. As can be seen from the above usage process, when the injection mold of this application is being molded, the PIN pin 300, under the action of the housing, separates from the insert 120 along the extension direction of the through hole 120a, so as to separate from the upper mold 100. Since the hardness difference between the insert 120 and the PIN pin 300 is less than or equal to 15 Rockwell hardness, the possibility of the insert 120 scratching the PIN pin 300 during the separation process of the PIN pin 300 and the insert 120 is small. Therefore, the injection mold of this application can reduce the possibility of scratching the PIN pin 300.

[0026] It should be noted that the upper mold 100 base 110 and the lower mold 200 in the injection mold are usually made of steel, the first molding surface 111 of the upper mold 100 and the second molding surface 210 of the lower mold 200 are made of steel, and the PIN pin 300 is made of copper.

[0027] refer to Figure 1 and Figure 2 In some embodiments of the present invention, the wall of the receiving hole 110a near the first molding surface 111 contracts inward to form a contraction portion 112. The insert 120 abuts against the end face of the contraction portion 112 facing away from the first molding surface 111, and a clearance gap 113 is formed between the insert 120 and the first molding surface 111. It can be understood that by providing the contraction portion 112 at the end of the receiving hole 110a near the first molding surface 111, and by separating the insert 120 from the first molding surface 111 through the contraction portion 112 to form the clearance gap 113, the insert 120 will not directly contact the injection molding cavity area. This ensures that the surface of the charging head housing is defined by the first molding surface 111 and the second molding surface 210 during its formation, thereby guaranteeing the consistency of the surface appearance of the housing.

[0028] like Figure 1 and Figure 2As shown, in some embodiments, the height h of the clearance 113 satisfies: 0.5mm ≤ h ≤ 1mm. It is understood that by setting the height of the clearance 113 to 0.5mm to 1mm, the positioning and protection area of ​​the insert 120 for the PIN 300 can be increased, reducing the risk of the PIN contacting the base 110 and thus reducing the possibility of the PIN being scratched. Simultaneously, it ensures that the insert 120 does not affect the consistency of the housing surface appearance.

[0029] like Figure 1 and Figure 2 As shown, in some embodiments, the end face of the contraction portion 112 facing away from the first molding surface 111 is an annular guide slope 112a. It is understood that by setting the end face of the contraction portion facing away from the first molding surface 111 as an annular guide slope 112a, when the user installs the insert 120 into the receiving hole 110a, the insert 120 can slide to the bottom of the guide slope 112a under its own weight and guided by the guide slope 112a, facilitating the installation of the insert 120; by setting the annular guide slope 112a, the strength of the injection mold opening can be further enhanced.

[0030] refer to Figure 1 and Figure 2 In some embodiments of the present invention, the insert 120 is made of bronze. It is understood that bronze has good wear resistance and self-lubricating properties, and the surface hardness of bronze is relatively soft. Therefore, inserts 120 made of bronze can further reduce the possibility of the PIN pin 300 being scratched.

[0031] refer to Figure 1 and Figure 2 In some embodiments of the present invention, the receiving hole 110a penetrates the base 110, and the end of the receiving hole 110a opposite to the first molding surface 111 has a mounting opening 110b that allows the insert 120 to pass through. It is understood that the user can install the insert 120 by passing the insert 120 through the mounting opening 110b into the receiving hole 110a, which is relatively simple.

[0032] like Figure 1 and Figure 2As shown, in some embodiments, the insert 120 is provided with a limiting protrusion 121, and the wall of the receiving hole 110a near the mounting opening 110b is provided with a stepped surface 114. The stepped surface 114 abuts against the limiting protrusion 121 to prevent the insert 120 from approaching the first molding surface 111. It can be understood that when the user inserts the insert 120 through the mounting opening 110b to install the workpiece, the limiting protrusion 121 of the insert 120 can abut against the stepped surface 114 on the wall of the receiving hole 110a, thereby further preventing the insert 120 from approaching the first molding surface 111 under the action of the PIN pin 300.

[0033] like Figure 1 and Figure 2 As shown, in some embodiments, the upper mold 100 seat further includes a limiting member, which is detachably connected to the seat body 110. The limiting member is located at the mounting opening 110b and serves to prevent the insert 120 from disengaging from the mounting opening 110b to the receiving hole 110a. It is understood that when the user installs the insert 120 into the receiving hole 110a, by installing the limiting member at the mounting opening 110b, the insert 120 can be prevented from disengaging from the mounting opening 110b to the receiving hole 110a.

[0034] refer to Figure 1 and Figure 2 In some embodiments of the present invention, the first molding surface 111 is provided with two receiving holes 110a, and each receiving hole 110a is provided with an insert 120. It can be understood that the user first inserts two PIN pins 300 into the insertion holes 120a of the two inserts 120 respectively, closes the upper mold 100 and the lower mold 200, and then injects into the injection cavity to form a shell in the injection cavity, and connects the shell with the part of the PIN pins 300 located in the injection cavity. The shell and the two PIN pins 300 together form a charging head.

[0035] The following is for reference Figure 3 A method for manufacturing a charging head according to a second aspect embodiment of the present invention will be described in detail.

[0036] refer to Figure 3 According to a second aspect embodiment of the present invention, a method for manufacturing a charging head is applied to an injection mold as described in the above embodiment. The manufacturing method specifically includes, but is not limited to, the following steps: S100. Insert two pins 300 into the insertion holes 120a of the two inserts 120 respectively; S200: The upper mold 100 and the lower mold 200 are closed to form an injection cavity between the first molding surface 111 and the second molding surface 210, wherein the PIN needle 300 is partially located inside the injection cavity; S300, Injection molding is performed into the injection cavity to form a shell inside the injection cavity, and the shell is connected to the part of the PIN pin 300 located inside the injection cavity. The shell and the PIN pin 300 together constitute the charging head. S400: Separate the upper mold 100 and the lower mold 200, and remove the resulting charging head.

[0037] Understandably, in the manufacturing method of the charging head, two PIN pins 300 are first inserted into the insertion holes 120a of the insert 120 and connected to the insert 120. The upper mold 100 and the lower mold 200 are then closed. At this time, an injection cavity is formed between the first molding surface 111 of the upper mold 100 and the second molding surface 210 of the lower mold 200. Part of the PIN pins 300 are located in the injection cavity. Then, injection molding is performed into the injection cavity to form a shell in the injection cavity and to connect the shell with the part of the PIN pins 300 located in the injection cavity. The shell and the PIN pins 300 together constitute the charging head. Then, the upper mold 100 and the lower mold 200 are separated and the formed charging head is taken out. As can be seen from the above manufacturing method, under the action of the housing, the PIN pin 300 separates from the insert 120 along the extension direction of the through hole 120a to separate from the upper mold 100. Since the hardness difference between the insert 120 and the PIN pin 300 is less than or equal to 15 Rockwell hardness, the possibility of the insert 120 scratching the PIN pin 300 during the separation process of the PIN pin 300 from the insert 120 is small. Therefore, the manufacturing method of this application can reduce the possibility of scratching the PIN pin 300.

[0038] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An injection mold, characterized in that, include: The upper mold includes a base and an insert. The base has a first forming surface and a receiving hole. The insert is embedded in the receiving hole and has a through hole. The through hole communicates with the opening of the receiving hole and is used for insertion and removal of a PIN. The hardness difference between the insert and the PIN is less than or equal to 15 Rockwell hardness. The lower mold has a second molding surface, and an injection cavity is formed between the second molding surface and the first molding surface.

2. The injection mold according to claim 1, characterized in that, The wall of the receiving hole near the end of the first molding surface contracts inward to form a contraction portion. The insert abuts against the end face of the contraction portion away from the first molding surface, and a clearance gap is formed between the insert and the first molding surface.

3. The injection mold according to claim 2, characterized in that, The height h of the clearance space satisfies: 0.5mm ≤ h ≤ 1mm.

4. The injection mold according to claim 2, characterized in that, The end face of the contraction section opposite to the first molding surface is an annular guide slope.

5. The injection mold according to claim 1, characterized in that, The inlay is made of bronze.

6. The injection mold according to claim 1, characterized in that, The receiving hole extends through the base body, and the end of the receiving hole opposite to the first molded surface forms an installation opening that allows the insert to pass through.

7. An injection mold according to claim 6, characterized in that, The insert has a limiting protrusion, and the receiving hole has a stepped surface on the hole wall near the mounting opening. The stepped surface abuts against the limiting protrusion to prevent the insert from approaching the first molding surface.

8. An injection mold according to claim 6, characterized in that, The upper mold base also includes a limiting member, which is detachably connected to the base body. The limiting member is located at the mounting opening and is used to prevent the insert from disengaging from the mounting opening into the receiving hole.

9. An injection mold according to any one of claims 1 to 8, characterized in that, The first molding surface is provided with two receiving holes, and each receiving hole is provided with an insert.

10. A method for manufacturing a charging head, characterized in that, Applied to the injection mold as described in claim 9, the manufacturing method includes the following steps: Insert the two pins into the insertion holes of the two inserts respectively; The upper mold and the lower mold are closed to form an injection cavity between the first molding surface and the second molding surface, wherein the PIN pin portion is located within the injection cavity; Injection molding is performed into the injection cavity to form a shell within the injection cavity, and the shell is connected to the portion of the PIN pin located within the injection cavity. The shell and the PIN pin together constitute the charging head. Separate the upper mold and the lower mold, and remove the resulting charging head.

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