Electronic plug terminal injection mold

Abstract

The embodiment of the invention discloses an electronic plug terminal injection mold which comprises a lateral core-pulling mechanism arranged on a movable mold, the lateral core-pulling mechanism comprises a sliding block and a first forming head, the first forming head is provided with a step-shaped supporting part and a forming part, and the forming part is matched with a peripheral inverted buckle and used for forming the peripheral inverted buckle; and the compensation mechanism is arranged on the fixed mold and comprises a locking block which is arranged in a floating manner, an ejection block is fixedly arranged on the movable mold, one side of the end cap is pressed against the supporting part during mold closing, and the ejection block drives the locking block to move so as to enable the locking block to abut against the other side of the end cap, so that the end cap is kept to be in close contact with the supporting part. According to the injection mold for the electronic plug terminal, the compensation mechanism is arranged between the movable mold and the fixed mold, so that the end cap is bidirectionally clamped by the supporting part and the locking block during mold closing, and even if machining tolerance exists, the position of the peripheral inverted buckle relative to the end cap is still kept stable, so that the forming precision and consistency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection mold, more particularly, to an electronic plug-in terminal injection mold. BACKGROUND

[0002] In combination Figures 1 to 3 In the existing plug-in terminal structure, the end cap is usually arranged at one end of the plug-in terminal in the axial direction. The lower part of the end cap is formed with a sleeve, and the inside of the sleeve is provided with a hole. An inner peripheral undercut is arranged on the inner wall of the hole to cooperate with the connector to realize positioning and locking of the plug-in part in the axial and radial directions. An outer peripheral undercut is arranged on the outer surface of the sleeve, which cooperates with the mounting hole or the clamping position in the pre-installation process to fix the sleeve and the end cap as a whole at the predetermined position. The end cap is usually made of metal and is placed in the mold in the form of an insert. The sleeve and the related bush structure are formed by the injection molding process. In this structure, the axial positioning function of the end cap and the fixing function of the outer peripheral undercut of the sleeve are interrelated, and both determine the assembly accuracy and installation reliability of the product.

[0003] However, in the above structure, since the end cap is a metal part, there is an inevitable tolerance in its thickness and processing size, and errors will also occur in the shrinkage and mold processing of the injection molded part, resulting in deviation of the actual position of the outer peripheral undercut relative to the end cap. When the fitting error between the end cap and the outer peripheral undercut is too large, the plug-in terminal will form an assembly gap after being installed at the predetermined position, thereby causing the risk of loose assembly or local looseness. In the working environment, such gaps are easy to cause relative movement or frictional knocking, thereby generating noise and vibration, reducing the NVH performance of the whole machine. In addition, once there is overflow or flash between the bottom of the end cap and the molded part, it is often judged as unqualified product, which significantly increases the requirements for mold precision control and process consistency, increasing the production difficulty and the defective rate. SUMMARY

[0004] The present application aims to overcome the size fitting error between the end cap and the outer peripheral undercut in the existing plug-in terminal injection structure, which leads to the formation of a gap after assembly, thereby causing the problems of loose installation, local looseness and noise and vibration, and to provide an electronic plug-in terminal injection mold which can improve the positioning accuracy and assembly reliability between the end cap and the injection molded part.

[0005] To achieve the above-mentioned purpose, the present application provides an electronic plug-in terminal injection mold, comprising: A side core pulling mechanism arranged on the movable mold, comprising a slider and a first forming head, the first forming head having a stepped support part and a forming part, the forming part being matched with the outer peripheral undercut for forming the outer peripheral undercut; The compensation mechanism installed on the fixed mold includes a floating locking block and a top block fixedly installed on the moving mold. When the mold is closed, one side of the end cap presses against the support part, and the top block drives the locking block to move, so that the locking block abuts against the other side of the end cap, thereby keeping the end cap in close contact with the support part.

[0006] Compared with existing technologies, this invention, by setting a compensation mechanism between the moving mold and the fixed mold, allows the end cap to be simultaneously clamped by the support and locking block during mold closing, thereby effectively eliminating fit errors between the end cap and the injection molded part caused by machining tolerances or molding shrinkage. Because the locking block presses down the end cap and keeps it in close contact with the support, the distance between the molding part and the end cap remains constant. Even if there are machining tolerances in the end cap, the position of the outer undercut relative to the end cap will not shift, thus significantly improving the molding accuracy and consistency of the outer undercut.

[0007] Therefore, this invention not only ensures the positioning accuracy of the end cap during the injection molding process and avoids the risk of gaps and loosening after installation, but also effectively improves the assembly reliability of the product.

[0008] According to one embodiment of the present invention, the compensation mechanism includes a sliding block slidably mounted on the fixed mold, having a first end and a second end opposite each other. The first end is obliquely slidably engaged with the end of the locking block furthest from the end cap. During mold closing, the top block abuts against the second end of the sliding block, causing the sliding block to move and drive the locking block downward. This structure, through the oblique engagement of the sliding block with the top block and the locking block, transforms the mold closing force into the downward pressure of the locking block.

[0009] According to one embodiment of the present invention, the sliding block is provided with a limiting groove, and a pressure block is installed in the fixed mold, the pressure block being in a limiting sliding engagement with the limiting groove. This design, through the engagement of the limiting groove and the pressure block, limits the stroke of the sliding block, avoiding excessive movement that could cause unstable locking or mold damage.

[0010] According to one embodiment of the present invention, the first end of the sliding block is provided with a first inclined groove, and the locking block is provided with a second inclined groove, wherein the first inclined groove and the second inclined groove are obliquely slidingly engaged. The combination of the first inclined groove and the second inclined groove forms a wedge structure, which transforms the lateral movement of the sliding block into the longitudinal movement of the locking block, making the force transmission smoother and reducing frictional resistance.

[0011] According to one embodiment of the present invention, the top block is provided with a first inclined surface, which abuts against the second end of the sliding block to drive the sliding block to move.

[0012] According to one embodiment of the present invention, the locking block is provided with a second inclined surface, the second inclined surface abutting against a first end of the sliding block to follow the movement of the sliding block.

[0013] According to one embodiment of the present invention, the fixed mold is provided with an inclined guide post, and the slider is provided with an inclined guide hole that slides obliquely with the inclined guide post. The cooperation between the inclined guide post and the inclined guide hole changes the mold closing force into the driving force for the slider to pull the core laterally.

[0014] According to one embodiment of the present invention, a spring is provided between the sliding block and the fixed mold, the spring having an elastic tendency to remain in close contact with the top block.

[0015] According to one embodiment of the present invention, the moving mold is equipped with a slanted ejector mechanism, which is used to form an inner circumferential undercut on the plug-in terminal.

[0016] According to one embodiment of the present invention, an insert is detachably installed inside the locking block. Since the locking block needs to contact the first and second metal pins, which are prone to wear, the contact position is set as an insert. This facilitates replacement when the insert is worn or damaged, reduces maintenance costs, and extends the overall service life of the mold. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the plug-in terminals in an embodiment of the present invention.

[0019] Figure 2 This is a half-sectional perspective view of the plug-in terminal in an embodiment of the present invention.

[0020] Figure 3 This is a perspective view of the molded part in an embodiment of the present invention.

[0021] Figure 4 This is a perspective view of the lateral core-pulling mechanism, the compensation mechanism, and the inclined top mechanism in an embodiment of the present invention.

[0022] Figure 5 This is a partial perspective view of the mold in an embodiment of the present invention.

[0023] Figure 6 for Figure 5 A cross-sectional view of the middle mold.

[0024] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle.

[0025] Figure 8 This is a perspective view of the compensation mechanism in an embodiment of the present invention.

[0026] Figure 9 This is a perspective view of the locking block in an embodiment of the present invention.

[0027] Figure 10 This is a perspective view of the sliding block in an embodiment of the present invention.

[0028] Figure 11 This is a perspective view of the lateral core-pulling mechanism in an embodiment of the present invention.

[0029] Figure 12 This is a top view of the mold in an embodiment of the present invention.

[0030] Figure 13 for Figure 12 A cross-sectional view along the BB line.

[0031] Explanation of the labels in the diagram: 10. Plug-in terminal; 20. Lateral core pulling mechanism; 30. Compensation mechanism; 40. Angled ejector mechanism; 11. End cap; 12. First pin; 13. Second pin; 14. Molded part; 14a. Inner perimeter inverted; 14b. Outer perimeter inverted; 21. Slider; 22. Angled guide post; 23. First forming head; 23a. Support part; 23b. Molding part; 31. Fixed mold core; 32. Sliding block; 33. Ejector block; 34. Pressure block; 35. Locking block; 36. Insert; 37. Fixed template; 38. Spring; 32a, First inclined groove; 32b, Limiting groove; 33a. First inclined plane; 35a, Second inclined groove; 35b, Second inclined surface; 35c, Second forming head. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Example 1

[0033] like Figures 1 to 3As shown, the plug-in terminal 10 includes an end cap 11, a first pin 12, a second pin 13, and a molded part 14. The end cap 11, the first pin 12, and the second pin 13 are all metal parts. The end cap 11 has a ring-shaped structure and is located at one axial end of the plug-in terminal 10. The molded part 14 is divided into three parts along the axial direction: the lower part forms a sleeve with a socket inside; the middle part is located in the central area of ​​the end cap 11; and the upper part covers the end cap 11. The first pin 12 and the second pin 13 are spaced apart and located at the center of the end cap 11. Their upper ends are flush with the upper end of the molded part 14, and their lower ends penetrate into the sleeve, forming a socket-fit structure with the socket. The corresponding connection terminals achieve reliable electrical connection through the sockets.

[0034] The inner wall of the socket is symmetrically provided with inner circumferential undercuts 14a, which are used to mate with the flange of the connecting terminal plug to achieve axial and radial positioning and locking. The outer circumference of the socket is provided with a notched outer circumferential undercut 14b, which is used to mate with the mounting hole or locking structure during pre-installation to fix the end cap 11 and the molded part 14 in the predetermined position. The end cap 11, the pins and the molded part 14 are combined by injection molding. Before injection molding, the end cap 11 and the two pins are placed in the corresponding positions of the mold. Molten plastic is injected into the mold cavity and cooled and solidified to form a complete molded part 14. The molten material can be recycled material, virgin material or a mixture of both, depending on the process requirements, to balance material performance and cost control.

[0035] like Figures 4 to 13 As shown, this embodiment discloses an injection mold for an electronic connector terminal 10, including a moving mold and a fixed mold. The moving mold is installed on the moving end of the injection molding machine, and the fixed mold is installed on the fixed end of the injection molding machine. The moving mold includes a moving template, a moving mold core, and a top plate, etc. (not shown in the figure). The fixed mold includes a fixed mold core 31 and a fixed template 37, with the fixed mold core 31 fixedly installed on the fixed template 37. A locking block 35 is slidably installed on the fixed mold core 31 along the mold opening direction, and a sliding block 32 is installed laterally in the fixed mold core 31 perpendicular to the mold opening direction, forming a stable kinematic fit. A slot for the insertion of a top block 33 is reserved inside the fixed mold core 31, and the second end of the sliding block 32 is located in the slot. During the mold closing process, the top block 33 inserts into the slot and pushes the sliding block 32 to move laterally, thereby completing the clamping action of the locking block 35. A lateral core-pulling mechanism 20 is provided on the moving mold, and a compensation mechanism 30 is provided on the fixed mold. The lateral core-pulling mechanism 20 includes a slider 21 and a first forming head 23. The first forming head 23 is located inside the slider 21 and is integrally formed with the slider 21. The first forming head 23 has a stepped structure, wherein the first step surface is a support portion 23a and the second step surface is a forming portion 23b. The support portion 23a is used to provide support for one side of the end cap 11 when the mold is closed, and the forming portion 23b matches the outer peripheral undercut 14b of the plug terminal 10 to form the outer peripheral undercut 14b.

[0036] Furthermore, combined Figure 8As shown, the compensation mechanism 30 includes a floating locking block 35, which is mounted on the fixed mold and cooperates with the top block 33 on the moving mold. The lower end of the locking block 35 is provided with a second forming head 35c, which is used to form the upper structure of the molded part 14. During the mold closing process, the top block 33 pushes the locking block 35 to move, so that the locking block 35 applies downward pressure to the other side of the end cap 11, thereby ensuring that the end cap 11 is always in close contact with the support part 23a in the mold-closed state, so as to ensure the positioning stability of the end cap 11 and the forming accuracy of the outer peripheral undercut 14b.

[0037] Furthermore, combining Figure 10 As shown, the compensation mechanism 30 includes a sliding block 32, which is laterally slidably mounted on the fixed mold core 31. The first end of the sliding block 32 forms an oblique sliding fit with the end of the locking block 35 away from the end cap 11, i.e., the first end of the sliding block 32 and the upper end of the locking block 35 combine to form an oblique wedge structure. During mold closing, the top block 33 applies force to the second end of the sliding block 32, driving the sliding block 32 to move laterally, thereby causing the locking block 35 to move downward, achieving the pressing and positioning of the end cap 11. The sliding block 32 is provided with a limiting groove 32b, and a pressure block 34 is provided in the fixed mold, forming a limiting sliding fit between the pressure block 34 and the limiting groove 32b. This structure can limit the movement range of the sliding block 32, preventing abnormal displacement of the sliding block 32 due to excessive force or improper reset, thereby improving the working stability of the compensation mechanism 30.

[0038] Furthermore, the first end of the sliding block 32 is provided with a first inclined groove 32a, and the locking block 35 is provided with a second inclined groove 35a, forming an oblique sliding fit between the two. The upper end of the top block 33 is provided with a first inclined surface 33a, which can abut against the second end of the sliding block 32 when the mold is closed. As the top block 33 is inserted into the groove of the fixed mold core 31, its inclined surface contacts the sliding block 32 and pushes the sliding block 32 to move laterally, thereby indirectly driving the locking block 35. The upper end of the locking block 35 is also provided with a second inclined surface 35b, which obliquely abuts against the first end of the sliding block 32. During the process of the top block 33 driving the sliding block 32 to move, the first end of the sliding block 32 interacts with the second inclined surface 35b of the locking block 35, causing the locking block 35 to follow the movement of the sliding block 32, ultimately generating reliable downward pressure on the end cap 11.

[0039] Furthermore, combined Figure 11 As shown, the fixed mold is provided with an inclined guide post 22, and the slider 21 on the moving mold is provided with an inclined guide hole that cooperates with the inclined guide post 22. When the moving mold and the fixed mold are opened and closed, the inclined guide post 22 and the inclined guide hole generate an inclined guiding effect, driving the slider 21 to achieve lateral core pulling along a predetermined trajectory, thereby facilitating the separation of the molding part 23b from the end cap 11 and the molding part 14 during the mold opening process.

[0040] Furthermore, combining Figure 13 As shown, a spring 38 is provided between the sliding block 32 and the fixed mold core 31. The spring 38 always maintains an elastic tendency to keep the sliding block 32 pressed tightly against the top block 33. During the mold opening process, when the top block 33 exits the slot of the fixed mold core 31, the sliding block 32 automatically resets under the action of the spring 38, causing the locking block 35 to disengage from the end cap 11, thus preventing the end cap 11 from being continuously pressed.

[0041] The moving mold is also equipped with a slanted ejector mechanism 40, which is used to form the inner circumferential undercut 14a structure of the inner wall of the insertion hole of the plug terminal 10 during the mold closing process. When the mold opens, the slanted ejector mechanism 40 ejects the molded part 14 with the help of the slanted guide structure, which facilitates the smooth demolding of the product. The slanted ejector mechanism 40 includes a slanted ejector rod and a top plate (not shown in the figure). The top plate slides obliquely with the lower end of the slanted ejector rod. The action of the top plate drives the slanted ejector rod to move obliquely inward, thereby realizing the demolding action.

[0042] Furthermore, combined Figures 6-7 As shown, the locking block 35 has a detachable insert 36 installed inside. The insert 36 can be replaced individually after wear or damage, avoiding the need to replace the entire locking block 35, thereby reducing maintenance costs and extending the service life of the mold.

[0043] Furthermore, during the mold opening stage, as the moving mold separates from the fixed mold, the sliding block 32 gradually loses the restraining effect of the top block 33. Under the action of the spring 38, the sliding block 32 moves laterally and drives the locking block 35 upward, releasing the downward pressure of the locking block 35 on the end cap 11. At this time, the end cap 11 is no longer in close contact with the support part 23a, avoiding friction and wear caused by the end cap 11 remaining in contact with the support part 23a during the lateral core pulling action. Thus, this design effectively reduces the risk of wear between the end cap 11 and the support part 23a, extending the service life of the mold.

[0044] In this embodiment, the injection molding step of the mold is as follows: Before injection molding, the end cap 11, the first insert pin 12, and the second insert pin 13 are first placed into the corresponding positions in the mold. At this time, the slider 21 drives the first molding head 23 into position, the support part 23a supports the lower side of the end cap 11, and the molding part 23b corresponds to the position of the undercut 14b on the outer periphery of the insert sleeve below the end cap 11. The moving mold is installed on the moving end of the injection molding machine, and the fixed mold is installed on the fixed end of the injection molding machine. Both the moving mold and the fixed mold include conventional template and mold core structures.

[0045] When the injection molding machine closes the mold, the moving mold and the fixed mold are closed. At this time, the ejector block 33 pushes the locking block 35 to move through the compensation mechanism 30, so that the locking block 35 applies downward pressure to the upper side of the end cap 11, ensuring that the end cap 11 is tightly attached to the support part 23a, and the distance between the molding part 23b and the end cap 11 remains fixed. Even if there are machining tolerances in the end cap 11, the position of the outer peripheral undercut 14b relative to the end cap 11 remains stable, ensuring high-precision molding. The sliding block 32 moves laterally under the action of the ejector block 33, driving the locking block 35 to press down, realizing the clamping and positioning of the end cap 11. The sliding block 32 and the locking block 35 slide obliquely through the inclined groove to ensure that the downward pressure is uniform and stable.

[0046] Afterwards, the injection molten material is injected into the mold cavity and cooled and solidified to form a complete molded part 14, including an end cap 11, a sleeve, an inner hole, and an outer peripheral undercut 14b structure.

[0047] During the mold opening stage, the moving mold separates from the fixed mold. The sliding block 32 loses the restraining effect of the top block 33 and returns to its lateral position under the action of the spring 38. At the same time, it drives the locking block 35 to move up along the mold opening direction, releasing the downward pressure on the end cap 11. The end cap 11 and the support part 23a are no longer in close contact, avoiding friction and wear during the lateral core pulling action. The lateral core pulling mechanism 20, through the cooperation of the inclined guide post 22 and the inclined guide hole of the slider 21, realizes the smooth lateral extraction of the slider 21 and the forming part 23b, separating them from the end cap 11 and the forming part 14.

[0048] Then, the inclined ejector mechanism 40 is used to form the inner circumferential undercut 14a structure of the inner wall of the insertion hole of the plug terminal 10 during mold closing. During mold opening, the molded part 14 is ejected with the help of the inclined guide structure to ensure smooth demolding of the insertion hole. The inclined ejector rod moves along the inclined inward side under the inclined push of the top plate, ejecting the insertion hole and the molded part 14 out of the mold cavity, completing the demolding process.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 limitations on this invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An injection mold for electronic connector terminals, characterized in that, include: The lateral core-pulling mechanism disposed on the moving mold includes a slider and a first forming head. The first forming head has a stepped support portion and a forming portion. The forming portion matches the outer peripheral undercut and is used to form the outer peripheral undercut. The compensation mechanism installed on the fixed mold includes a floating locking block and a top block fixedly installed on the moving mold. When the mold is closed, one side of the end cap presses against the support part, and the top block drives the locking block to move, so that the locking block abuts against the other side of the end cap, thereby keeping the end cap in close contact with the support part.

2. The injection mold for an electronic connector terminal according to claim 1, characterized in that: The compensation mechanism includes a sliding block, which is slidably mounted on the fixed mold and has a first end and a second end. The first end is obliquely slidably engaged with the end of the locking block away from the end cap. When the mold is closed, the top block abuts against the second end of the sliding block, causing the sliding block to move and drive the locking block to press down.

3. The injection mold for an electronic connector terminal according to claim 2, characterized in that: The sliding block is provided with a limiting groove, and a pressure block is installed in the fixed mold. The pressure block is in a limiting sliding fit with the limiting groove.

4. The injection mold for an electronic connector terminal according to claim 2, characterized in that: The first end of the sliding block is provided with a first inclined groove, and the locking block is provided with a second inclined groove. The first inclined groove and the second inclined groove slide together obliquely.

5. The injection mold for an electronic connector terminal according to claim 2, characterized in that: The top block is provided with a first inclined surface, which abuts against the second end of the sliding block to drive the sliding block to move.

6. The injection mold for an electronic connector terminal according to claim 5, characterized in that: The locking block has a second inclined surface, which abuts against the first end of the sliding block to move with the sliding block.

7. The injection mold for an electronic connector terminal according to claim 1, characterized in that: The fixed mold is provided with an inclined guide post, and the slider is provided with an inclined guide hole that slides obliquely with the inclined guide post.

8. The injection mold for an electronic connector terminal according to claim 1, characterized in that: A spring is provided between the sliding block and the fixed mold, and the spring has an elastic tendency to keep it in close contact with the top block.

9. The injection mold for an electronic connector terminal according to claim 1, characterized in that: The moving mold is equipped with a slanted ejector mechanism, which is used to form the inner circumferential undercut on the plug-in terminal.

10. An injection mold for an electronic connector terminal according to claim 1, characterized in that: An insert is detachably installed inside the locking block.

Images