In-mold forming steel wire screw and positioning tool thereof

Abstract

The utility model discloses an in-mold forming steel wire screw sleeve and positioning tool, relates to steel wire screw sleeve technical field. The utility model discloses a lower mould, upper mould, plastic cylinder and hollow seat, the top of lower mould is provided with upper mould, and the corner of lower mould bottom is provided with movable mouth no.

Description

Technical Field

[0001] This utility model belongs to the field of wire thread insert technology, and in particular relates to an in-mold formed wire thread insert and its positioning tooling. Background Technology

[0002] In-mold forming of wire thread inserts is an advanced insert injection molding process. Its core lies in directly embedding a metal wire thread insert into the plastic part during the injection molding process. This process aims to overcome the inherent defects of low strength and easy wear of pure plastic threads. By combining the advantages of metal and plastic, it creates a composite component with high-strength internal threads. The main advantages of this technology are significant: it provides extremely high connection strength and durability, allowing the threads to withstand repeated assembly and disassembly and high-torque tightening, effectively preventing stripping. Simultaneously, it enhances structural integrity and reliability, dispersing stress through the metal thread insert and preventing plastic cracking. It is particularly suitable for hard and brittle engineering plastics. When installing it on the mold of the injection molding equipment, it requires positioning and alignment using tooling. However, in-mold forming of wire thread inserts and their positioning tooling still have the following drawbacks in practical use: In the positioning process of in-mold forming wire thread inserts and their positioning fixtures, the wire thread insert needs to be placed on the limiting structure inside the mold. The positioning is achieved by screwing the wire thread insert onto the corresponding screw or other structure, and then rotating it off after the work is completed. The positioning process is cumbersome and not convenient enough. Secondly, in the positioning process, the in-mold forming wire thread sleeve and its positioning fixture directly place the thread sleeve in the fixture through extrusion. During the production process, the sealing effect is not high enough, and the injection plastic can easily enter the thread sleeve in the fixture, affecting the injection molding effect. Utility Model Content

[0003] The purpose of this utility model is to provide an in-mold forming wire thread sleeve and its positioning fixture. By setting up a lower mold, an upper mold, a plastic cylinder and a hollow seat, it solves the problems that the positioning operation of the in-mold forming wire thread sleeve and its positioning fixture is relatively cumbersome, and that the injection plastic is easy to enter the thread sleeve during operation, affecting the injection molding effect.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to an in-mold forming wire thread sleeve and its positioning fixture, comprising a lower mold, an upper mold, a plastic cylinder, and hollow seats. The upper mold is provided on the top of the lower mold, and a movable opening 1 is provided at the corner of the bottom of the lower mold. A movable opening 2 is provided on the top of the upper mold corresponding to the movable opening 1. Hollow seats are fixed to the outer side of the movable opening 2 on the top of the upper mold and the outer side of the movable opening 1 on the bottom of the lower mold. Pushing discs are movably connected to the two hollow seats at their close ends. The two pushing discs are movably connected to the movable opening 1 and the movable opening 2, respectively. A plastic cylinder is provided between the two pushing discs. The lower mold and the upper mold constitute the main space for injection molding. Movable opening 1 and movable opening 2 are provided at corresponding positions on the bottom of the lower mold and the top of the upper mold, respectively. Two hollow seats are fixed to the outer sides of the upper and lower molds, and a pushing disc is movably connected to the inner side of each hollow seat. The pushing discs extend into the movable opening 1 and the movable opening 2, respectively. The two pushing discs together clamp and fix the plastic cylinder located between the upper and lower molds, realizing the positioning and support of the plastic cylinder in the mold cavity.

[0005] Furthermore, a sealing frame is fixed at the upper outer edge of the lower mold, and a sealing groove is provided at the top of the sealing frame. The sealing frame is fixed at the upper edge of the lower mold, and a sealing groove is provided at the top of the sealing frame, which is used to cooperate with the upper mold to form a sealing structure.

[0006] Furthermore, a second sealing frame is fixed at the lower edge of the outer side of the upper mold, and a sealing strip is fixed at the bottom of the second sealing frame. The sealing strip is movably connected in the sealing groove. The second sealing frame is fixed at the lower edge of the upper mold, and a sealing strip is installed at the bottom of the second sealing frame. When the mold is closed, the sealing strip is embedded in the sealing groove of the first sealing frame of the lower mold to achieve sealing of the joint surface of the upper and lower molds and prevent leakage of the injection plastic.

[0007] Furthermore, a wire thread sleeve body is fixed on the inner wall of the plastic cylinder. The wire thread sleeve body is set in the lower mold and the upper mold. After the mold is closed, the wire thread sleeve body is located in the cavity formed by the upper and lower molds. During injection molding, the plastic covers and molds it, so that the thread sleeve is firmly embedded in the workpiece.

[0008] Furthermore, each of the two hollow seats has an electric push rod fixed at one end away from the other. The telescopic end of the electric push rod faces the hollow seat, and a piston rod is fixed to the telescopic end of the electric push rod. The piston rod passes through the bottom of the hollow seat. An electric push rod is installed on the outside of each hollow seat, and its telescopic end is connected to the piston rod. The piston rod passes through the bottom of the hollow seat. The electric push rod drives the piston rod to reciprocate, thereby driving the push plate to move forward and backward.

[0009] Furthermore, the end of the piston rod away from the electric push rod is fixed to the end of the push plate away from the plastic cylinder. A sealing ring is fixed to the section of the push plate near the plastic cylinder. The sealing ring abuts against the end of the plastic cylinder. The end of the piston rod is fixed to the outside of the push plate. A sealing ring is installed on the inside of the push plate. When the electric push rod pushes the push plate to the end of its stroke, the sealing ring tightly abuts against the end of the plastic cylinder, sealing the gap between the plastic cylinder and the mold, preventing the injected plastic from entering the cylinder. Before the mold opens, the electric push rod retracts, driving the push plate to reset, making it easy to remove the finished workpiece.

[0010] This utility model has the following beneficial effects: This invention solves the problem of cumbersome positioning operations for in-mold forming of wire thread inserts and their positioning fixtures by setting up a lower mold, an upper mold, and a plastic cylinder. When it is necessary to position the main body of the wire thread insert on the injection-molded workpiece, the main body of the wire thread insert is first placed in the movable opening of the lower mold and supported by the top of the push plate on the hollow seat at the bottom of the lower mold, making the positioning operation of the in-mold forming of wire thread inserts and their positioning fixtures more convenient.

[0011] This invention solves the problem of plastic entering the in-mold forming wire thread sleeve and its positioning fixture during injection molding, which affects the injection molding effect, by setting up a lower mold, an upper mold, a plastic cylinder, and hollow seats. After the upper and lower molds are fully closed, the electric push rods on the two hollow seats can be activated. The electric push rods drive the piston rods, pushing the push plate until its end face is flush with the inner wall of the corresponding lower or upper mold. The sealing ring on the push plate presses against the two ends of the plastic cylinder, sealing the gap between the plastic cylinder and the lower or upper molds, preventing the plastic from entering the plastic cylinder during injection molding. After injection molding is completed, when the lower and upper molds need to be separated, the electric push rods are activated to drive the push plate to reset. After the molded workpiece is removed, the next work cycle begins. This design makes it difficult for plastic to enter the in-mold forming wire thread sleeve and its positioning fixture during injection molding, ensuring the injection molding effect. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A three-dimensional view of an in-mold formed wire thread sleeve and its positioning fixture after disassembly; Figure 2 This is a three-dimensional structural view of the lower mold; Figure 3 This is a three-dimensional structural diagram of the upper mold; Figure 4 This is a three-dimensional structural diagram of a plastic tube; Figure 5 This is a three-dimensional view of the hollow seat section after it has been cut open. Figure 6 This is a three-dimensional view of a combination structure of an in-mold formed wire thread sleeve and its positioning tooling.

[0014] Figure label: 1. Lower mold; 101. Movable opening one; 102. Sealing frame one; 103. Sealing groove; 2. Upper mold; 201. Movable opening two; 202. Sealing frame two; 203. Sealing strip; 3. Plastic cylinder; 301. Wire thread sleeve body; 4. Hollow seat; 401. Electric push rod; 402. Piston rod; 403. Push plate; 404. Sealing ring. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation Example 1

[0016] Please see Figure 1-4 This utility model relates to an in-mold forming wire thread sleeve and its positioning fixture, comprising a lower mold 1, an upper mold 2, a plastic cylinder 3, and a hollow seat 4. The upper mold 2 is mounted on the top of the lower mold 1. After the lower mold 1 and the upper mold 2 are joined together, they are used for injection molding. A movable opening 101 is provided at the corner of the bottom of the lower mold 1. A movable opening 201 is provided on the top of the upper mold 2 corresponding to the movable opening 101. Movable openings 101 and 201 are movably connected to the push plates 403 at the ends of the two hollow seats 4, supporting the hollow seats 4 within the lower mold 1 and the upper mold 2. The outer side of the movable opening 201 on the top of the upper mold 2 is connected to the lower mold. Hollow seats 4 are fixed on the outer side of the bottom movable opening 101. The hollow seats 4 connect and set the push plate 403 on the upper mold 2 or the lower mold 1. The push plate 403 is movably connected to the two hollow seats 4 at their close ends. The two push plates 403 are movably connected in the movable opening 101 and the movable opening 201 respectively. The push plate 403 clamps and sets the plastic tube 3, restricting the plastic tube 3 in the space inside the upper mold 2 and the lower mold 1. The plastic tube 3 is set between the two push plates 403. The plastic tube 3 fixes the wire thread sleeve body 301 in it, which helps to set the thread sleeve in the space between the lower mold 1 and the upper mold 2.

[0017] Specifically, a sealing frame 102 is fixed at the upper outer edge of the lower mold 1, and a sealing groove 103 is provided on the top of the sealing frame 102. The lower mold 1 is movably connected to the sealing strip 203 through the sealing groove 103 on the sealing frame 102.

[0018] Furthermore, a sealing frame 202 is fixed at the lower edge of the outer side of the upper mold 2, and a sealing strip 203 is fixed at the bottom of the sealing frame 202. The sealing strip 203 is movably connected in the sealing groove 103. The upper mold 2 is movably connected to the sealing groove 103 through the sealing strip 203 on the sealing frame 202, so that the upper mold 2 and the lower mold 1 cooperate to seal the gap between the lower mold 1 and the upper mold 2.

[0019] Furthermore, a wire thread sleeve body 301 is fixed on the inner wall of the plastic cylinder 3. The wire thread sleeve body 301 is set in the lower mold 1 and the upper mold 2. The plastic cylinder 3 is sealed by the wire thread sleeve body 301 and is injection molded with the injection molded workpiece to prevent the injection plastic from entering the opening at the end of the plastic cylinder 3.

[0020] The operation process of this embodiment is as follows: When it is necessary to position the wire thread insert body 301 on the injection molded workpiece, the wire thread insert body 301 is first placed in the movable opening 101 inside the lower mold 1 and supported by the top of the push plate 403 on the hollow seat 4 at the bottom of the lower mold 1. The top of the upper mold 2 is installed with the lifting end of the lifting device. The upper mold 2 is driven to descend. After the upper mold 2 descends and is pressed between the lower mold 1, the sealing strip 203 at the bottom of the sealing frame 202 enters the sealing groove 103 of the sealing frame 102 and seals the edges between the lower mold 1 and the upper mold 2. Specific Implementation Example 2

[0021] Please see Figure 1-6 Based on the first specific embodiment, each of the two hollow seats 4 has an electric push rod 401 fixed at one end that is far apart from each other. The telescopic end of the electric push rod 401 is set towards the hollow seat 4. A piston rod 402 is fixed at the telescopic end of the electric push rod 401. The piston rod 402 passes through the bottom end of the hollow seat 4. The hollow seat 4 drives the piston rod 402 to move through the electric push rod 401, and drives the push plate 403 to move.

[0022] Specifically, the end of the piston rod 402 away from the electric push rod 401 is fixed to the end of the push plate 403 away from the plastic cylinder 3. A sealing ring 404 is fixed to the part of the push plate 403 near the plastic cylinder 3. The sealing ring 404 abuts against the end of the plastic cylinder 3. The push plate 403 abuts against the end of the plastic cylinder 3 through the sealing ring 404, sealing the gap between the lower mold 1 and the upper mold 2 and the plastic cylinder 3.

[0023] The operation process of this embodiment is as follows: During operation, after the upper mold 2 and the lower mold 1 are fully closed, the electric push rods 401 on the two hollow seats 4 are activated. The electric push rods 401 drive the piston rod 402, which pushes the push plate 403 to move until its end face is flush with the inner wall of the corresponding lower mold 1 or upper mold 2. Then, the sealing ring 404 on the push plate 403 presses against the two ends of the plastic cylinder 3, sealing the gap between the plastic cylinder 3 and the lower mold 1 and the upper mold 2. This prevents the injected plastic from entering the plastic cylinder 3 during the injection process. After the injection is completed, when it is necessary to separate the lower mold 1 and the upper mold 2, the electric push rods 401 are activated to drive the push plate 403 to reset. After the molded workpiece is removed, the next work cycle begins.

[0024] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An in-mold forming steel wire thread sleeve and its positioning fixture, comprising a lower mold (1), an upper mold (2), a plastic cylinder (3), and a hollow seat (4), characterized in that: The lower mold (1) is provided with an upper mold (2) at its top. The lower mold (1) has a movable opening (101) at the corner of its bottom. The upper mold (2) has a movable opening (201) at its top corresponding to the movable opening (101). Hollow seats (4) are fixed to the outer side of the movable opening (201) at the top of the upper mold (2) and the outer side of the movable opening (101) at the bottom of the lower mold (1). Pushing discs (403) are movably connected to the two hollow seats (4) at their closest ends. The two pushing discs (403) are movably connected to the movable opening (101) and the movable opening (201) respectively. A plastic tube (3) is provided between the two pushing discs (403).

2. The in-mold forming wire thread sleeve and its positioning fixture according to claim 1, characterized in that: A sealing frame (102) is fixed at the upper outer edge of the lower mold (1), and a sealing groove (103) is provided on the top of the sealing frame (102).

3. The in-mold forming wire thread sleeve and its positioning fixture according to claim 2, characterized in that: A sealing frame 2 (202) is fixed at the lower edge of the outer side of the upper mold (2), and a sealing strip (203) is fixed at the bottom of the sealing frame 2 (202). The sealing strip (203) is movably connected in the sealing groove (103).

4. The in-mold forming wire thread sleeve and its positioning fixture according to claim 1, characterized in that: The inner wall of the plastic cylinder (3) is fixed with a wire thread sleeve body (301), which is set in the lower mold (1) and the upper mold (2).

5. The in-mold forming wire thread sleeve and its positioning fixture according to claim 1, characterized in that: An electric push rod (401) is fixed at one end of each of the two hollow seats (4) that are far apart from each other. The telescopic end of the electric push rod (401) is set towards the hollow seat (4). A piston rod (402) is fixed at the telescopic end of the electric push rod (401). The piston rod (402) passes through the bottom end of the hollow seat (4).

6. The in-mold forming wire thread sleeve and its positioning fixture according to claim 5, characterized in that: The piston rod (402) is fixed at one end away from the electric push rod (401) and at the end of the push plate (403) away from the plastic cylinder (3). A sealing ring (404) is fixed at one end of the push plate (403) near the plastic cylinder (3). The sealing ring (404) abuts against the end of the plastic cylinder (3).

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