Automobile connector injection mold

Abstract

The utility model discloses a kind of vehicle connector injection mould, including front mould component and rear mould component, front mould component includes front mould kernel, and rear mould component includes rear mould kernel;Front mould kernel includes front mould cavity, mounting cylinder and mounting plate, and the cavity bottom of front mould cavity is equipped with installation cavity;Mounting plate includes front fixed part and front cooperation part, and front notch is equipped between adjacent front cooperation part, and front mounting groove is equipped on the end face of front fixed part, and front forming needle is fixed in each front mounting groove;Rear mould kernel includes protruding seat and mounting seat, and rear mould cavity is equipped on protruding seat, and mounting seat includes rear fixed part and rear cooperation part, and rear notch is equipped between adjacent rear cooperation part, and rear mounting groove is equipped on each rear cooperation part, and multiple through cavities are equipped on rear fixed part, and rear forming needle extending to rear mounting groove is assembled in each through cavity, the utility model can improve moulding precision, prevent the problem such as uneven hole wall thickness, hole position deviation caused by forming needle deviation, and further avoid producing fly edge, burr and appearance defects such as scorch black spot.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically relating to an injection mold for automotive connectors. Background Technology

[0002] Connectors are fundamental connecting components in vehicle systems, widely used in the electrical circuits of automobiles, motorcycles, and other motor vehicles. They typically consist of a housing, contacts, insulators, and accessories. The housing is the main structural support of the connector, providing mechanical protection and environmental shielding for the internal contacts and insulators, and also enabling insertion, alignment, and installation. The housing structure mainly includes a base and insertion holes for the contacts. Currently, connector housings are commonly manufactured using injection molding: the rear mold moves towards the front mold to close and lock the mold, then molten plastic is injected into the mold cavity. After pressure holding, cooling, and shaping, the mold opens, and the ejector mechanism ejects the product for demolding.

[0003] As the integration of vehicle internal systems continues to increase, to adapt to the limited interior space, while ensuring the electrical performance and mechanical strength of connectors, the overall housing is trending towards miniaturization, with increasingly compact and dense socket arrangements. For housings with a large number of sockets, because the socket diameter and spacing are both smaller than the hole depth, resulting in a deep-hole structure, it is difficult to consistently guarantee the mold closing accuracy of conventional molds. Molding pins are prone to misalignment, leading to uneven hole wall thickness, hole misalignment, and consequently, appearance defects such as flash, burrs, and burnt spots. This results in low injection molding yield and high defect rates for multi-socket housings, making it difficult to meet high-precision molding requirements. Consequently, it is challenging to meet the quality and cost requirements of mass production of automotive components. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a mold for the injection molding process of connector housings that has better injection molding effect and higher yield than the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an injection mold for automotive connectors, comprising a front mold assembly and a rear mold assembly. The front mold assembly includes a front mold core, and the rear mold assembly includes a rear mold core opposite to the front mold core. The front mold core includes a front mold cavity, a mounting cylinder, and a mounting plate. The bottom of the front mold cavity is provided with a mounting cavity for the mounting cylinder to be inserted. The mounting plate includes a front fixing part located on the mounting cylinder and multiple front mating parts extending from the mounting cylinder to the front mold cavity. A front notch extending to the end face of the front mating part away from the front fixing part is provided between adjacent front mating parts. Multiple front mounting grooves are provided on the end face of the front fixing part, respectively penetrating to each front mating part. A front forming pin extending from the front fixing part to the front mating part is fixed in each front mounting groove. The rear mold core includes a protrusion seat and a mounting seat. The protrusion seat is provided with a rear mold cavity for the mounting seat to be inserted. The opening of the rear mold cavity is opposite to the opening of the front mold cavity. The mounting seat includes a rear fixing part and multiple forward-facing notches. The mold core extends to a rear mating portion, and adjacent rear mating portions are provided with a rear notch extending to the end face of the rear mating portion away from the rear fixing portion. Each rear mating portion is provided with a rear mounting groove, and the rear fixing portion is provided with a plurality of through cavities that communicate with each rear mounting groove. Each through cavity is fitted with a rear forming pin extending to the rear mounting groove. Both the front mounting groove and the rear mounting groove are square grooves, and the radial cross-section of the through cavity is square. The outer wall of the front forming pin fits against the groove wall of the front mounting groove, and the surface of the front forming pin located at the groove opening of the front mounting groove and the surface where the groove opening of the front mounting groove is located simultaneously abut against the inner wall of the mounting cavity. The outer wall of the rear forming pin located at the rear mounting groove fits against the groove wall of the rear mounting groove, and the outer wall of the through cavity fits against the inner wall of the through cavity. After the front mold assembly and the rear mold assembly are closed, the protrusion is inserted into the corresponding front mold cavity, the groove opening of the front mounting groove and the groove opening of the rear mounting groove abut against each other, the front notch and the rear notch are provided in a corresponding manner, and the front forming pin and the rear forming pin abut against each other.

[0006] Compared with existing molds, the above-mentioned solution can effectively improve the mold closing accuracy and prevent problems such as uneven hole wall thickness and hole position deviation caused by the deviation of the forming pin. This avoids appearance defects such as flash, burrs and burnt black spots, and improves the molding quality and consistency of the product.

[0007] As a further feature of this invention, the mounting cylinder has a front stepped surface at its opening away from the rear mold core, and the front fixing part and the front forming pin are both provided with front mating steps that limit the front stepped surface; the rear mold cavity has a rear stepped surface at its opening away from the front mold core, the mounting base has a first rear mating step that limits the rear stepped surface, the through cavity has a through cavity step at its opening away from the rear mounting groove, and the rear forming pin has a second rear mating step that limits the through cavity step.

[0008] The above solution ensures the stability of the overall structure and the accuracy of assembly.

[0009] As a further feature of this utility model, there are two mounting plates. The front mounting groove is disposed on the opposite surfaces of the two mounting plates. The front fixing parts of the two mounting plates are fitted together, and there is a gap between the front mating parts of the two mounting plates. The rear fixing part includes a plurality of segments arranged in sequence. One segment is fixed to two rear mating parts. There is a space between the two rear mating parts located on the same segment for the front mating part to be inserted, and the rear mounting grooves on the two rear mating parts are arranged opposite each other. The rear mating steps on the two rear forming needles located on the same segment are arranged opposite each other. The through cavity step is disposed between the two through cavities of the same segment.

[0010] Using the above method, a double-row pin structure can be processed, and the processing accuracy of the double-row pins can be guaranteed.

[0011] As a further feature of this utility model, the front mounting groove is provided with a U-shaped protrusion at the groove opening away from the front fixing part, and the connection between the rear mounting groove and the through cavity is provided with a protrusion; after the front mold assembly and the rear mold assembly are closed, the protrusion surrounds the protrusion.

[0012] Using the above scheme, the protrusions and blocks form a nested positioning fit during mold closing, which can play a guiding and centering role in the process of mold closing between the front mold core and the rear mold core.

[0013] As a further feature of this invention, the rear mold assembly also includes an ejector groove and an ejector plate. The ejector groove is located on the surface of the rear mold core facing the front mold core. The ejector plate is disposed in the ejector groove. There are two protrusions, both located in the ejector groove. The ejector plate is provided with protruding holes for the two protrusions to protrude. There are two front mold cavities, each corresponding to one of the two protrusions. The two front mold cavities are connected by a flow channel.

[0014] Using the above solution, two shell workpieces can be processed simultaneously in one injection molding cycle, improving production efficiency; during demolding, the ejector plate ejects the two products synchronously, ensuring that the two products are subjected to uniform ejection force and that the ejection action is synchronized.

[0015] As a further feature of this invention, the flow channel includes a main flow channel, branch flow channels, and connecting flow channels. The branch flow channels include an N-shaped front flow channel disposed on the front mold core and an N-shaped rear flow channel disposed on the ejector plate. The front flow channel is disposed between the two front mold cavities. There are multiple connecting flow channels, which are conical in shape. Each connecting flow channel is evenly distributed between the front flow channel and the two front mold cavities. The large end of each connecting flow channel is connected to a parallel groove segment in the front flow channel, and the small end is connected to the corresponding front mold cavity. The main flow channel is connected to the middle of the front flow channel. The rear mold core also includes three insert rods that are respectively inserted into the three groove segments of the rear flow channel.

[0016] The above solution, with its N-shaped runner and tapered connecting runner, allows the molten plastic to be evenly distributed to the two mold cavities after entering from the main runner, ensuring consistent molding quality for both products and facilitating subsequent demolding.

[0017] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the present utility model; Appendix Figure 2 This is a schematic diagram of the front mold assembly in a specific embodiment of the present utility model; Appendix Figure 3 This is a diagram of the rear mold assembly of a specific embodiment of this utility model; Appendix Figure 4 This is a schematic diagram of the mounting plate and mounting cylinder in a specific embodiment of this utility model; Appendix Figure 5 This is a cross-sectional view of the front mold core portion of a specific embodiment of the present invention; Appendix Figure 6 This is a schematic diagram of the mounting base according to a specific embodiment of the present utility model; Appendix Figure 7 This is a cross-sectional view of the mold core portion in a specific embodiment of this utility model.

[0019] Front mold assembly 1, rear mold assembly 2, front mold core 3, front mold cavity 31, mounting cylinder 32, front step surface 321, mounting plate 33, front fixing part 331, front mating part 332, front notch 333, front mounting groove 334, protrusion 335, mounting cavity 34, front forming pin 35, front mating step 36, rear mold core 4, protrusion seat 41, rear mold cavity 411, rear step surface 412, mounting seat 42, rear fixing part 421, sub-part 4211, rear mating part 422, rear notch 423, rear mounting groove 424, through cavity 425, through cavity step 4251, protrusion 426, rear mating step one 427, rear forming pin 43, rear mating step two 431, insert rod 44, ejector groove 51, ejector plate 52, protruding hole 521, main flow channel 61, front flow channel 621, rear flow channel 622, connecting flow channel 63. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise specified, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, to facilitate a clear and intuitive demonstration of the structure of each component of this technical solution and the cooperation relationship between the components, the dimensions of some components have been adaptively adjusted by enlarging or reducing their proportions in the accompanying drawings, and some existing technical structures involved in the solution have been simplified. The dimensions and external structures shown in the accompanying drawings should not be directly construed as limitations on the actual size or shape of the product.

[0022] Specific embodiments of this utility model are shown in the accompanying drawings. Wherein, 'a' represents the injection-molded shell workpiece. The housing after injection molding in this embodiment is shown in Figure a.

[0023] An injection mold for automotive connectors includes a front mold assembly 1 and a rear mold assembly 2. The front mold assembly 1 includes a front mold core 3, and the rear mold assembly 2 includes a rear mold core 4 opposite to the front mold core 3.

[0024] The front mold core 3 includes a front mold cavity 31, a mounting cylinder 32, and a mounting plate 33. The bottom of the front mold cavity 31 is provided with a mounting cavity 34 for the mounting cylinder 32 to be inserted. The mounting plate 33 includes a front fixing part 331 located on the mounting cylinder 32 and multiple front mating parts 332 extending from the mounting cylinder 32 to the front mold cavity 31. A front notch 333 extending to the end face of the front mating part 332 away from the front fixing part 331 is provided between adjacent front mating parts 332. Multiple front mounting grooves 334 are provided on the end face of the front fixing part 331, which respectively penetrate to each front mating part 332. A front forming pin 35 extending from the front fixing part 331 to the front mating part 332 is fixed in each front mounting groove 334. The rear mold core 4 includes a protrusion 41 and a mounting base 42. The protrusion 41 is provided with a rear mold cavity 411 for the mounting base 42 to be installed. The opening of the rear mold cavity 411 is opposite to the opening of the front mold cavity 31. The mounting base 42 includes a rear fixing part 421 and multiple rear mating parts 422 extending to the front mold core 3. A rear notch 423 extending to the end face of the rear mating part 422 away from the rear fixing part 421 is provided between adjacent rear mating parts 422. Each rear mating part 422 is provided with a rear mounting groove 424. The rear fixing part 421 is provided with multiple through cavities 425 that are connected to each rear mounting groove 424. Each through cavity 425 is equipped with a rear forming pin 43 extending to the rear mounting groove 424. Both the front mounting groove 334 and the rear mounting groove 424 are square grooves, and the radial cross-section of the through cavity 425 is square. The outer wall of the front forming pin 35 is in contact with the groove wall of the front mounting groove 334, and the surface of the front forming pin 35 located at the groove opening of the front mounting groove 334 and the surface where the groove opening of the front mounting groove 334 is located simultaneously abut against the inner wall of the mounting cavity 34. The rear forming pin 43 is located on the outer wall of the rear mounting groove 424 and is in contact with the groove wall of the rear mounting groove 424, and the outer wall of the through cavity 425 is in contact with the inner wall of the through cavity 425. After the front mold assembly 1 and the rear mold assembly 2 are closed, the protrusion 41 is inserted into the corresponding front mold cavity 31. The openings of the front mounting groove 334 and the rear mounting groove 424 abut against each other one by one. The front notch 333 and the rear notch 423 are set one by one. The front forming pin 35 and the rear forming pin 43 abut against each other. In this embodiment, the mounting cavity 34 is also provided with a front core protruding into the front mold cavity 31, and the rear mold cavity 411 is also provided with a rear core for snap-fit ​​forming. This part is consistent with the prior art and will not be described in detail in this application.

[0025] A U-shaped protrusion 335 is provided at the opening of the front mounting groove 334 away from the front fixing part 331, and a protrusion 426 is provided at the connection between the rear mounting groove 424 and the through cavity 425; after the front mold assembly 1 and the rear mold assembly 2 are closed, the protrusion 335 surrounds the protrusion 426. During mold closing, the protrusion 335 and the protrusion 426 form a nested positioning fit.

[0026] The mounting cylinder 32 has a front stepped surface 321 at its opening away from the rear mold core 4. The front fixing part 331 and the front forming pin 35 are both provided with a front mating step 36 that limits the front stepped surface 321. The rear mold cavity 411 has a rear stepped surface 412 at its opening away from the front mold core 3. The mounting base 42 has a rear mating step 427 that limits the rear stepped surface 412. The through cavity 425 has a through cavity step 4251 at its opening away from the rear mounting groove 424. The rear forming pin 43 has a rear mating step 431 that limits the through cavity step 4251.

[0027] This embodiment has two mounting plates 33. A front mounting groove 334 is disposed on the opposite surfaces of the two mounting plates 33. The front fixing portions 331 of the two mounting plates 33 are fitted together, and there is a gap between the front mating portions 332 of the two mounting plates 33. The rear fixing portion 421 includes multiple sequentially fitted sub-parts 4211. One sub-part 4211 is fixed to two rear mating portions 422. There is space between the two rear mating portions 422 on the same sub-part 4211 for the front mating portion 332 to insert into, and the rear mounting grooves 424 on the two rear mating portions 422 are arranged opposite each other. The rear mating steps 431 on the two rear forming pins 43 on the same sub-part 4211 are arranged opposite each other. A through-cavity step 4251 is disposed between the two through cavities 425 on the same sub-part 4211. After assembly, the end of the rear forming pin 43 away from the front mold core 3 is flush with the end face of the rear mold cavity 411 away from the front mold core 3. This allows for the processing of a double-row pin structure while ensuring the processing accuracy of the double-row pins.

[0028] The rear mold assembly 2 also includes an ejector groove 51 and an ejector plate 52. The ejector plate 52 moves relative to the rear mold core 4 by pushing the assembly. The ejector groove 51 is located on the surface of the rear mold core 4 facing the front mold core 3, and the ejector plate 52 is disposed within the ejector groove 51. There are two protrusion seats 41, both located within the ejector groove 51. The ejector plate 52 is provided with protruding holes 521 for the two protrusion seats 41 to protrude. The front mold cavity 31 has two protrusion seats 41, each corresponding to one of the two protrusion seats 41. The front mold assembly 1 includes a main runner 61, a front runner 621, and connecting runners 63. The front runner 621 is N-shaped and is located on the front mold core 3. The ejector plate 52 is provided with an N-shaped rear runner 622. After mold closing, the front runner 621 and the rear runner 622 are combined to form a branch runner. The front runner 621 is located between the two front mold cavities 31. There are four connecting runners 63, all of which are conical and are evenly distributed between the front runner 621 and the two front mold cavities 31. The large end of each connecting runner 63 is connected to a parallel groove segment in the front runner 621, and the small end is connected to the corresponding front mold cavity 31. One end of the main runner 61 is open to the outside, and the other end is connected to the middle of the front runner 621. The rear mold core 4 includes three insert rods 44, which are inserted into the three sections of the rear flow channel 622 respectively. The insert rod 44 located in the middle section corresponds to the main flow channel 61, and the remaining two are located between the two connecting flow channels 63 on the corresponding sections.

[0029] This embodiment allows for the simultaneous processing of two shell workpieces in a single injection molding process, improving production efficiency. During demolding, the ejector plate 52 ejects both products simultaneously, ensuring uniform ejection force and synchronized ejection actions. This avoids product deformation or damage caused by asynchronous ejection, thus improving product yield. After mold closing, the front runner 621 and rear runner 622 combine to form a manifold. The N-shaped manifold, combined with the tapered design of the tapered connecting runner 63, allows the molten plastic to be evenly distributed to the two front mold cavities 31 after entering from the main runner 61. This ensures consistent molding quality for both products and facilitates subsequent demolding. The insert rod 44 facilitates the demolding of the solidified material from the manifold.

[0030] Compared to existing molds, this embodiment effectively restricts the circumferential rotation and radial offset of the front forming pin 35 and the rear forming pin 43 within the corresponding grooves through the cooperation of the square mounting groove and the square forming pin. The end face of the front forming pin 35 abuts against the inner wall of the mounting cavity 34, and the rear forming pin 43 fits against the inner wall of the through cavity 425, achieving precise positioning of the forming pin. During mold closing, the protrusion 335 and the protrusion 426 form a nested positioning fit, and the fit between each step surface further restricts the relative displacement of the front mold core 3 and the rear mold core 4 in the horizontal direction and in the mold closing depth. This avoids uneven hole wall thickness and hole position deviation caused by mold closing misalignment or forming pin offset, reduces appearance defects such as flash, burrs, and burnt black spots, and improves product molding quality and consistency. At the same time, the mold can injection mold two connector products with double-row pin structures in one operation, with uniform flow of molten plastic and synchronous demolding and ejection, improving production efficiency while ensuring yield.

[0031] This utility model is not limited to the specific embodiments described above. Those skilled in the art can implement this utility model using other specific embodiments based on the content disclosed in this utility model. Any simple changes or modifications made to the design structure and concept of this utility model will fall within the protection scope of this utility model.

Claims

1. An injection mold for automotive connectors, comprising a front mold assembly and a rear mold assembly, wherein the front mold assembly includes a front mold core, and the rear mold assembly includes a rear mold core opposite to the front mold core, characterized in that: The front mold core includes a front mold cavity, a mounting cylinder, and a mounting plate. The bottom of the front mold cavity has a mounting cavity for the mounting cylinder to be inserted. The mounting plate includes a front fixing part located on the mounting cylinder and multiple front mating parts extending from the mounting cylinder into the front mold cavity. A front notch extending to the end face of the front mating part away from the front fixing part is provided between adjacent front mating parts. Multiple front mounting grooves, each penetrating to a front mating part, are provided on the end face of the front fixing part. A front forming pin extending from the front fixing part to the front mating part is fixed in each front mounting groove. The rear mold core includes a protrusion seat and a mounting seat. The protrusion seat has a rear mold cavity for the mounting seat to be inserted. The opening of the rear mold cavity is opposite to the opening of the front mold cavity. The mounting seat includes a rear fixing part and multiple rear mating parts extending to the front mold core. A rear notch extending to the end face of the rear mating part away from the rear fixing part is provided between adjacent rear mating parts. Each of the rear mating parts is provided with a rear mounting groove, and the rear fixing part is provided with a plurality of through cavities that are respectively connected to each of the rear mounting grooves. Each of the through cavities is equipped with a rear forming pin extending to the rear mounting groove. The front mounting groove and the rear mounting groove are both square grooves, and the radial cross-section of the through cavity is square. The outer wall of the front forming pin is in contact with the groove wall of the front mounting groove, and the surface of the front forming pin located at the groove opening of the front mounting groove and the surface where the groove opening of the front mounting groove is located simultaneously abut against the inner wall of the mounting cavity. The outer wall of the rear forming pin located at the rear mounting groove is in contact with the groove wall of the rear mounting groove, and the outer wall of the rear forming pin located at the through cavity is in contact with the inner wall of the through cavity. After the front mold assembly and the rear mold assembly are closed, the protrusion seat is inserted into the corresponding front mold cavity, the groove opening of the front mounting groove and the groove opening of the rear mounting groove abut against each other, the front notch and the rear notch are set in a corresponding manner, and the front forming pin and the rear forming pin abut against each other.

2. The automotive connector injection mold according to claim 1, characterized in that: The mounting cylinder has a front stepped surface at its opening away from the rear mold core. The front fixing part and the front forming pin both have front mating steps that limit the movement of the front stepped surface. The rear mold cavity has a rear stepped surface at its opening away from the front mold core. The mounting base has a first rear mating step that limits the movement of the rear stepped surface. The through cavity has a through cavity step at its opening away from the rear mounting groove. The rear forming pin has a second rear mating step that limits the movement of the through cavity step.

3. The automotive connector injection mold according to claim 2, characterized in that: There are two mounting plates. The front mounting groove is disposed on the opposite surfaces of the two mounting plates. The front fixing parts of the two mounting plates are fitted together, and there is a gap between the front mating parts of the two mounting plates. The rear fixing part includes multiple segments arranged in sequence. One segment is fixed to two rear mating parts. There is a space between the two rear mating parts on the same segment for the front mating part to be inserted, and the rear mounting grooves on the two rear mating parts are arranged opposite each other. The rear mating steps on the two rear forming needles on the same segment are arranged opposite each other. The through cavity step is disposed between the two through cavities of the same segment.

4. The automotive connector injection mold according to claim 3, characterized in that: The front mounting groove has a U-shaped protrusion at the groove opening away from the front fixing part, and the rear mounting groove has a protrusion at the connection between the groove and the through cavity; after the front mold assembly and the rear mold assembly are closed, the protrusion surrounds the protrusion.

5. The automotive connector injection mold according to claim 4, characterized in that: The rear mold assembly also includes an ejector groove and an ejector plate. The ejector groove is located on the surface of the rear mold core facing the front mold core. The ejector plate is disposed in the ejector groove. There are two protrusions, both of which are located in the ejector groove. The ejector plate is provided with protruding holes for the two protrusions to protrude. There are two front mold cavities, each corresponding to one of the two protrusions. The two front mold cavities are connected by a flow channel.

6. The automotive connector injection mold according to claim 5, characterized in that: The flow channel includes a main flow channel, branch flow channels, and connecting flow channels. The branch flow channels include an N-shaped front flow channel on the front mold core and an N-shaped rear flow channel on the ejector plate. The front flow channel is located between the two front mold cavities. There are multiple connecting flow channels, which are conical. Each connecting flow channel is evenly distributed between the front flow channel and the two front mold cavities. The large end of each connecting flow channel is connected to a parallel segment in the front flow channel, and the small end is connected to the corresponding front mold cavity. The main flow channel is connected to the middle of the front flow channel. The rear mold core also includes three insert rods that are inserted into the three segments of the rear flow channel respectively.

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