Movable insert structure of hardware insert for injection molding

Abstract

The utility model discloses a movable insert needle structure of hardware insert for injection molding, including former, back mould, the back mould with former cooperation, and the former and back mould form injection molding cavity between, be provided with hardware insert in the injection molding cavity, insert movable subassembly, the insert movable subassembly contains insert and spring piece, wherein the insert is along vertical direction movable installation in the former, and the insert has highest position and lowest position with the former, the lower end of the insert is opposite the hardware insert and is attached with the hardware insert, the spring piece is installed in the former inside, and is located the upper end of the insert, to the insert exert the downward force, the utility model discloses the combination structure design of spring piece and movable insert, utilize the telescopic performance of spring piece and cope with the hardware insert of height high and height low simultaneously, ensure the production yield of product.

Description

Technical Field

[0001] This utility model relates to the technical field of molds, and in particular to a movable insert structure for metal inserts used in injection molding. Background Technology

[0002] Currently, an increasing number of products adopt a composite structure of plastic and metal inserts, forming a combined structure where metal inserts are embedded within plastic parts. This includes embedding metal nuts, sheet metal parts, and other metal inserts into plastic components. This structure fully utilizes the performance advantages of both plastics and metals, making the best use of resources and achieving ingenious integration to optimize functionality while minimizing cost and weight.

[0003] However, the supplied metal inserts will have tolerance ranges during processing. In injection molds, the inserts are generally fixed, and the positions of the inserts and metal inserts should not be in error when the mold is closed. Because the rigid mold closes, the inserts will exert hard pressure on the metal inserts that are higher than the expected height, causing them to deform or be damaged. For metal inserts that are lower than the expected height, gaps will appear between the inserts and the metal inserts because the inserts are not completely attached to the upper surface of the metal inserts. These gaps are the source of molten plastic seeping in and forming edging, resulting in edging at the metal inserts after the product is injection molded. Utility Model Content

[0004] The main objective of this invention is to provide a movable insert structure for injection molding hardware inserts, aiming to solve at least one problem in the background art.

[0005] This utility model is implemented according to the following technical solution:

[0006] This utility model discloses a movable insert structure for injection molding hardware inserts, comprising:

[0007] Front mold;

[0008] The rear mold mates with the front mold, and an injection cavity is formed between the front mold and the rear mold. A metal insert is provided in the injection cavity.

[0009] A pin-mounted movable assembly includes a pin and a spring, wherein the pin is movably mounted vertically on the front mold and has a highest position and a lowest position relative to the front mold; the lower end of the pin faces and abuts the hardware insert; the spring is mounted inside the front mold and located at the upper end of the pin to apply a downward force to the pin.

[0010] In a preferred embodiment, the front mold includes an A plate and a front mold core from top to bottom. The side of the A plate facing the front mold core has a recessed hole for mounting the spring. The front mold core has a stepped through cavity that is wider at the top and narrower at the bottom. The stepped through cavity is directly opposite the recessed hole and is used to mount the insert pin. The shape of the stepped through cavity is adapted to the shape of the insert pin.

[0011] In a preferred embodiment, the stepped through cavity has a limiting cavity and a straight insertion cavity connected from top to bottom, and the width of the concave hole is smaller than the width of the limiting cavity; the insert has a radial protrusion and a straight insertion portion connected from top to bottom, the width of the radial protrusion is larger than the straight insertion portion, the radial protrusion is located at the limiting cavity, and the straight insertion portion extends downward through the straight insertion cavity to be inserted into the hardware insert.

[0012] In a preferred embodiment, HD≥d1+d2, where H is the height of the limiting cavity, D is the height of the radial protrusion, d1 is the upper deviation value of the height of the hardware insert, and d2 is the lower deviation value of the height of the hardware insert.

[0013] In a preferred embodiment, when the height of the hardware insert is the basic size, after the front mold and the rear mold are fitted together, the distance D1 between the plane of the upper end of the radial protrusion and the surface of the adjacent A plate is greater than or equal to the upper deviation value d1 of the height of the hardware insert, and the distance D2 between the plane of the lower end of the radial protrusion and the horizontal plane of the limiting cavity is greater than or equal to the lower deviation value d2 of the height of the hardware insert.

[0014] In a preferred embodiment, the spring is a compression spring.

[0015] In a preferred embodiment, the pin-mounting assembly further includes a magnet mounted on the pin for attracting the metal insert.

[0016] In a preferred embodiment, the hardware insert is a nut.

[0017] This utility model has the following beneficial effects:

[0018] This utility model utilizes a combination structure design of spring components and movable inserts to simultaneously accommodate hardware inserts that are too high or too low, thereby ensuring product yield.

[0019] To address the issue of excessively tall hardware inserts, the insert moves vertically and is equipped with a spring at its upper end. When the height of the hardware insert exceeds the expected value, the hardware insert will push the insert upward during the mold closing process. The spring will then compress and generate elastic buffer. The height deviation of the hardware insert is absorbed by the spring deformation, preventing the mold from applying rigid extrusion force to the hardware insert and completely preventing it from being flattened and damaged.

[0020] For hardware inserts that are too low in height, the spring component always applies a downward force to the insert pin. This force pushes the insert pin downward, ensuring that the lower end of the insert pin is always in close contact with the upper surface of the hardware insert, eliminating the gap between the two and preventing edge defects at the hardware insert from the source. Attached Figure Description

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a cross-sectional view of the movable insert structure of the metal insert for injection molding according to this utility model.

[0023] Figure 2 for Figure 1 Enlarged view of A in the middle;

[0024] Figure 3 This is a structural diagram of the nut of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100 Front mold, 110A plate, 111 concave hole, 120 front mold core, 121 stepped through cavity, 1211 limiting cavity, 200 insert pin, 210 radial protrusion, 220 straight insertion, 300 spring part, 400 magnet, 500 hardware insert, 600 injection molded part. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0028] To better illustrate this utility model, a further detailed description of this utility model is provided below with reference to the accompanying drawings.

[0029] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0030] See Figures 1 to 3 This utility model discloses a mold with a movable insert pin 200 structure, comprising:

[0031] Front mold 100;

[0032] A rear mold (not shown) is provided, which cooperates with the front mold 100 and forms an injection cavity between the front mold 100 and the rear mold. A metal insert 500 is provided in the injection cavity, and the injection cavity is used to form an injection molded product 600.

[0033] A movable pin assembly 200 includes a pin 200 and a spring 300. The pin 200 is movably mounted vertically on the front mold 100 and has a highest and lowest position relative to the front mold 100. The lower end of the pin 200 faces and abuts the hardware insert 500. The spring 300 is installed inside the front mold 100 and located above the pin 200 to apply a downward force to the pin 200.

[0034] This utility model uses a combination structure design of spring 300 and movable insert 200 to utilize the telescopic performance of spring 300 to simultaneously accommodate hardware inserts 500 with varying heights, ensuring product yield.

[0035] To address the issue of excessively tall hardware inserts 500, insert pins 200 move vertically and are fitted with springs 300 at their upper ends. When the height of the hardware insert 500 exceeds expectations, during the mold closing process, the hardware insert 500 will push the insert pins 200 upwards, and the springs 300 will compress accordingly and generate elastic buffering. The deformation of the springs 300 absorbs the height deviation of the hardware insert 500, preventing the mold from applying rigid extrusion force to the hardware insert 500 and completely preventing it from being flattened and damaged.

[0036] To address the issue of the low-height hardware insert 500, the spring 300 consistently applies a downward force to the pin 200. This force pushes the pin 200 downward, ensuring that the lower end of the pin 200 is always in close contact with the upper surface of the hardware insert 500, eliminating the gap between them, and preventing edge defects at the hardware insert 500 from the source.

[0037] In one embodiment, the front mold 100 includes, from top to bottom, an A plate 110 and a front mold core 120. The A plate 110 has a recess 111 on the side facing the front mold core 120, which is used to install the spring member 300. The front mold core 120 has a stepped through cavity 121 that is wider at the top and narrower at the bottom. The stepped through cavity 121 is directly opposite the recess 111 and is used to install the insert pin 200. The shape of the stepped through cavity 121 is adapted to the shape of the insert pin 200.

[0038] The recessed hole 111 on the side of plate A110 facing the front mold core 120 provides a dedicated installation space for spring 300. The size and depth of the recessed hole 111 can be precisely matched with the specifications of spring 300, avoiding lateral displacement, tilting or shaking of spring 300 during injection molding / mold opening. This ensures that spring 300 always applies a downward force to insert 200 in the vertical direction, preventing uneven force on insert 200 and inability to stably fit the hardware insert 500 due to spring 300 displacement.

[0039] The "stepped cavity 121 with a wider top and a narrower bottom" of the front mold core 120 is adapted to the shape of the insert 200. The stepped structure can form a radial limit on the insert 200, which not only prevents the insert 200 from deflecting when moving vertically, but also limits the lowest position of the insert 200 through the stepped surface, ensuring that the lower end of the insert 200 is always aligned with the hardware insert 500, and preventing the insert 200 from shifting and causing misalignment, gaps or excessive compression between it and the hardware insert 500.

[0040] By matching the concave hole 111 with the stepped through cavity 121, the spring 300 and the insert 200 can be coaxially assembled, ensuring that the elastic force is stably transmitted to the insert 200 in the vertical direction, thereby ensuring that the fitting pressure and tolerance compensation function of the insert 200 to the hardware insert 500 are continuously reliable.

[0041] Furthermore, the stepped through cavity 121 has a limiting cavity 1211 and a straight insertion cavity connected from top to bottom, and the width of the concave hole 111 is smaller than the width of the limiting cavity 1211; the insert pin 200 has a radial protrusion 210 and a straight insertion portion 220 connected from top to bottom, the width of the radial protrusion 210 is larger than the straight insertion portion 220, the radial protrusion 210 is located at the limiting cavity 1211, and the straight insertion portion 220 extends downward through the straight insertion cavity and is inserted into the hardware insert 500.

[0042] The radial protrusion 210 of the insert pin 200 is located at the limiting cavity 1211, and the width of the radial protrusion 210 is greater than that of the straight insertion portion 220. The straight insertion portion 220 is adapted to the straight insertion cavity. When the spring member 300 pushes the insert pin 200 downward, the lower end face of the radial protrusion 210 will be tightly fitted with the connecting stepped surface of the limiting cavity 1211 and the straight insertion cavity to form a rigid limit, accurately limiting the lowest position of the insert pin 200, completely eliminating the risk of the insert pin 200 falling out of the straight insertion cavity due to excessive downward movement, and ensuring that the insert pin 200 is always in the preset working range.

[0043] The width of the recess 111 is smaller than the width of the limiting cavity 1211. When the hardware insert 500 pushes the insert pin 200 upward, the upper end face of the radial protrusion 210 of the insert pin 200 will gradually approach the lower end face of the A plate (i.e., the opening of the recess 111). Since the width of the recess 111 cannot accommodate the radial protrusion 210, the upper end face of the radial protrusion 210 will be blocked by the lower end face of the A plate, forming a maximum position limit. This limit is compatible with the elastic limit of the spring 300, which can prevent the spring 300 from undergoing permanent deformation due to excessive compression, ensure the long-term stable elastic force of the spring 300, and ensure the continuous effectiveness of the tolerance compensation function.

[0044] Furthermore, to ensure that the height of the limiting cavity 1211 completely covers the height tolerance range of the hardware insert 500 and satisfies the tolerance compensation, the relationship between the height of the limiting cavity 1211, the height of the radial protrusion 210, and the upper and lower deviation values ​​of the hardware insert 500 is set as HD≥d1+d2, where H is the height of the limiting cavity 1211, D is the height of the radial protrusion 210, d1 is the upper deviation value of the height of the hardware insert 500, and d2 is the lower deviation value of the height of the hardware insert 500.

[0045] Furthermore, when the height of the hardware insert 500 is the basic dimension, after the front mold 100 and the rear mold are fitted together, the distance D1 between the plane at the upper end of the radial protrusion 210 and the surface of the adjacent A plate is greater than or equal to the upper deviation value d1 of the height of the hardware insert 500, and the distance D2 between the plane at the lower end of the radial protrusion 210 and the horizontal plane of the limiting cavity 1211 is greater than or equal to the lower deviation value d2 of the height of the hardware insert 500.

[0046] For the hardware insert 500 with height deviation, the insert pin 200 needs to move upward to compress the spring 300 and absorb the deviation. At this time, the upward movement space D1 provided by the limiting cavity 1211 must at least cover d1 to ensure that the insert pin 200 has enough upward movement margin to fully accommodate the upper deviation of the hardware insert 500. This avoids the insert pin 200 being unable to lift due to insufficient upward movement space, and ensures that the hardware insert 500 can be seamlessly adapted from the basic size to the maximum upper deviation size.

[0047] For the hardware insert 500 with a height deviation, the insert pin 200 needs to move downward to fit the hardware insert 500 and eliminate gaps. At this time, the downward movement space D2 provided by the limiting cavity 1211 must at least cover d2 to avoid the insert pin 200 being unable to move down due to insufficient downward movement space, resulting in a gap between it and the hardware insert 500. This completely eliminates edge defects and enables seamless adaptation of hardware inserts 500 from the maximum downward deviation size to the basic size.

[0048] In one embodiment, the spring 300 is a compression spring. The compression spring can meet the movement requirements of the insert pin 200; when the insert pin 200 moves upward, the compression spring will be further compressed as the insert pin 200 pushes, and the spring length will shorten in the vertical direction; when the insert pin 200 moves downward, the compression spring will gradually extend as the elastic force is released, and its extension and contraction direction is completely consistent with the movement direction of the insert pin 200, so it will not hinder the movement of the insert pin 200, ensuring that the insert pin 200 can move smoothly throughout the entire movement range without the risk of jamming.

[0049] In one embodiment, the movable component of the insert pin 200 further includes a magnet 400, which is mounted on the insert pin 200 for attracting the metal insert 500. When the metal insert 500 is placed in the corresponding position in the rear mold, and the insert pin 200 adheres to the metal insert 500 under the downward force of the spring member 300, the magnet 400 immediately generates an attractive force on the metal insert 500, firmly fixing the metal insert 500 in the preset position and preventing displacement deviation of the metal insert 500 during injection molding.

[0050] In one embodiment, the hardware insert 500 is a nut with a basic height of 6mm, an upper deviation d1 of 0.05mm, and a lower deviation d2 of 0.05mm.

[0051] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A movable insert structure for injection molding hardware inserts, characterized in that, include: Front mold; The rear mold mates with the front mold, and an injection cavity is formed between the front mold and the rear mold. A metal insert is provided in the injection cavity. A pin-mounted movable assembly includes a pin and a spring, wherein the pin is movably mounted vertically on the front mold and has a highest position and a lowest position relative to the front mold; the lower end of the pin faces and abuts the hardware insert; the spring is mounted inside the front mold and located at the upper end of the pin to apply a downward force to the pin.

2. The movable insert structure for injection molding hardware inserts according to claim 1, characterized in that: The front mold comprises, from top to bottom, a plate A and a front mold core. The side of the plate A facing the front mold core has a recessed hole for mounting the spring. The front mold core has a stepped through cavity that is wider at the top and narrower at the bottom. The stepped through cavity is directly opposite the recessed hole and is used to mount the insert pin. The shape of the stepped through cavity is adapted to the shape of the insert pin.

3. The movable insert structure for injection molding hardware inserts according to claim 2, characterized in that: The stepped through cavity has a limiting cavity and a straight insertion cavity connected from top to bottom, and the width of the concave hole is smaller than the width of the limiting cavity; The insert has a radially protruding part and a straight insertion part connected from top to bottom. The width of the radially protruding part is greater than that of the straight insertion part. The radially protruding part is located at the limiting cavity. The straight insertion part extends downward through the straight insertion cavity and is inserted into the hardware insert.

4. The movable insert structure for injection molding hardware inserts according to claim 3, characterized in that: HD≥d1+d2, H is the height of the limiting cavity, D is the height of the radial protrusion, d1 is the upper deviation value of the height of the hardware insert, and d2 is the lower deviation value of the height of the hardware insert.

5. The movable insert structure for injection molding hardware inserts according to claim 4, characterized in that: When the height of the hardware insert is the basic size, after the front mold and the rear mold are fitted together, the distance D1 between the plane at the upper end of the radial protrusion and the surface of the adjacent A plate is greater than or equal to the upper deviation value d1 of the height of the hardware insert, and the distance D2 between the plane at the lower end of the radial protrusion and the horizontal plane of the limiting cavity is greater than or equal to the lower deviation value d2 of the height of the hardware insert.

6. The movable insert structure for injection molding hardware inserts according to claim 1, characterized in that: The spring component is a compression spring.

7. The movable insert structure for injection molding hardware inserts according to claim 1, characterized in that: The pin-setting assembly also includes a magnet mounted on the pin for attracting the metal insert.

8. The movable insert structure for injection molding hardware inserts according to claim 1, characterized in that: The hardware insert is a nut.

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