Forming die for gearbox oil pan

Abstract

The utility model relates to the technical field of injection molds, in particular to a forming mold for a gearbox oil pan, which comprises an upper mold and a lower mold, an upper mold core is arranged on the upper mold, a lower mold core matched with the upper mold core is arranged on the lower mold, the upper mold core and the lower mold core are matched with each other to form a forming cavity, and the forming mold further comprises a cable-stayed slide mechanism. The cable-stayed slide mechanism comprises a guide sliding block and a pair of slide blocks, the same ends of the two slide blocks can be installed on the guide sliding block in a face-to-face or back-to-back sliding mode, two cable-stayed guide holes are formed in the upper mold core, the two slide blocks can be movably inserted into the two cable-stayed guide holes respectively, a forming column is arranged on the lower mold core, and the two ends of the forming column are connected with the two slide blocks. A traction rod is movably clamped on the forming column, the traction rod movably penetrates through the upper mold core and is fixedly connected with the guide sliding block, and the other ends of the two slide blocks are clamped outside the forming column and form part of the side wall of the forming cavity. According to the forming die, the gearbox oil pan can be formed at a time, and meanwhile demolding is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a molding mold for a gearbox oil pan. Background Technology

[0002] The function of an automotive transmission oil pan is to seal the bottom of the transmission and act as an outer shell for the oil reservoir, preventing impurities from entering. It also collects and stores the lubricating oil flowing back from the various friction surfaces of the transmission, dissipates some heat, and prevents oil oxidation. The automotive transmission oil pan has an irregularly shaped surface structure, therefore it is generally manufactured using injection molding, as illustrated in patent CN202321873947.4 – a molding die for an automotive engine oil pan.

[0003] Currently, the transmission oil pan has an openable and closable drain hole for draining waste oil from the transmission. Its sidewalls have threads or several retaining rings to work with a cap to seal the drain hole. However, conventional mold cavities are difficult to mold such structures during injection molding, and even if they can be formed, it hinders subsequent demolding. This necessitates secondary injection molding, resulting in a long, inefficient, and costly manufacturing process. To address this, some manufacturers have designed sliding mechanisms in the mold to achieve phased demolding and ensure a consistent product. However, molding structures like the drain hole involves highly complex sliding mechanisms that are prone to jamming and difficult to open. Utility Model Content

[0004] In order to overcome one of the shortcomings of the prior art, the purpose of this utility model is to provide a molding die for a transmission oil pan. This molding die for a transmission oil pan can form the transmission oil pan in one step and is also easy to demold.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0006] A molding die for a gearbox oil pan includes an upper die and a lower die. The upper die has an upper die core, and the lower die has a lower die core that mates with the upper die core. The upper and lower die cores cooperate to form a molding cavity. The die also includes a slanted sliding mechanism, which includes a guide slider and a pair of sliding blocks. The same end of the two sliding blocks can be slidably mounted on the guide slider, either facing each other or facing away from each other. The upper die core has two slanted guide holes, and the two sliding blocks can be movably inserted into the two slanted guide holes respectively. The lower die core has a molding post, and a pull rod is movably mounted on the molding post. The pull rod can separate from the molding post and movably penetrate the upper die core and is fixedly connected to the guide slider. The other ends of the two sliding blocks hug the outside of the molding post and form part of the sidewall of the molding cavity. When the upper die core opens relative to the lower die core, the two sliding blocks can move in opposite directions.

[0007] Furthermore, the lower mold core is provided with an insertion hole, and the forming column is movably inserted into the insertion hole. The forming column can only be pulled out from the end of the insertion hole away from the upper mold. The end of the forming column is provided with an insertion hole, and the end of the pull rod is provided with an insertion post that mates with the insertion hole. The insertion post and the insertion hole are interference fit and can be separated from each other.

[0008] Furthermore, the diameter of the end of the forming column connected to the traction rod is larger than the diameter of the traction rod.

[0009] Furthermore, the upper end of the pull rod is connected to the guide slider by bolts.

[0010] Furthermore, the two positioning blocks have notches on the opposite side of their respective ends that cooperate with the guide slider, for avoiding the pull rod.

[0011] Furthermore, the upper mold is provided with plate A, the upper mold core is mounted on plate A, the lower mold core is provided with plate B, the lower mold core is mounted on plate B, plate A is provided with clearance holes, the guide slider is located in the clearance holes, and the upper ends of the two sliding blocks and the upper end of the pull rod are all located in the clearance holes.

[0012] Furthermore, the upper mold is provided with at least one positioning post, and the outward end of all the positioning posts is placed in the clearance hole and is movably inserted into the guide hole of the guide slider.

[0013] Furthermore, the cross-section of the guide slider is T-shaped, and one end of each of the two positioning blocks is provided with a groove that cooperates with the guide slider.

[0014] Furthermore, the lower mold is provided with an ejector pin mechanism, which is used to lift the upper mold.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This utility model discloses a molding die for a gearbox oil pan. Based on existing molds, it incorporates a slanted sliding mechanism. This mechanism allows for the gradual opening of fasteners during the mold opening process, facilitating one-time molding of the product. Two sliding blocks engage with the forming pillar, forming part of the molding cavity. This structural design is beneficial for molding annular local structures. The cooperation between the slanted guide holes and the sliding blocks, along with the design of the pull rod, allows the upper and lower mold cores to gradually separate during the first stage of mold opening. Simultaneously, the two sliding blocks move in opposite directions to open, ensuring partial demolding of the molded product. In the second stage of mold opening, the upper mold drives the upper and lower mold cores to separate, and the pull rod also separates from the forming pillar, making it easy for workers to remove the product mounted on the forming pillar.

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

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0019] Figure 2 This is an exploded view of an embodiment of the present utility model;

[0020] Figure 3 This is a top view of an embodiment of the present utility model;

[0021] Figure 4 yes Figure 3 A cross-sectional view along the AA direction.

[0022] Explanation of icon numbers:

[0023] Upper mold 10, A plate 11, clearance hole 12, positioning pin 13, lower mold 20, upper mold core 30, inclined guide hole 31, lower mold core 40, forming pin 41, insertion hole 42, pull rod 53, B plate 44, guide hole 45, inclined sliding mechanism 50, guide slider 51, sliding block 52, pull rod 53, insertion pin 54, bolt 55, forming cavity 60, ejector pin mechanism 70. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0025] Reference Figures 1 to 4The mold shown is for forming a gearbox oil pan, including an upper mold 10 and a lower mold 20. The upper mold 10 has an upper mold core 30, and the lower mold 20 has a lower mold core 40 that mates with the upper mold core 30. The upper mold core 30 and the lower mold core 40 cooperate to form a forming cavity 60. The mold also includes a slanted sliding mechanism 50, which includes a guide slider 51 and a pair of sliding blocks 52. The same end of the two sliding blocks 52 can slide towards or away from each other on the guide slider 51. The upper mold core 30 has two slanted guide holes 31. The two sliding blocks 52 can be movably inserted into the two inclined guide holes 31 respectively. A forming post 41 is provided on the lower mold core 40. A pull rod 53 is movably clamped on the forming post 41. The pull rod 53 can be separated from the forming post 41. The pull rod 53 movably penetrates the upper mold core 30 and is fixedly connected to the guide slider 51. The other end of the two sliding blocks 52 hugs the outside of the forming post 41 and forms part of the side wall of the forming cavity 60. When the upper mold core 30 opens relative to the lower mold core 40, the two sliding blocks 52 can move in opposite directions.

[0026] The upper mold 10, upper mold core 30, lower mold 20, and lower mold core 40 are all conventional designs, which will not be described in detail here. Furthermore, the forming pillar 41 and the pull rod 53 are designed with a snap-fit ​​connection. The main purpose of this design is to ensure that, under certain pressure, i.e., during mold opening, the force exerted by the inclined guide hole 31 on the upper mold core 30 on the guide slider 51 through the sliding block 52 prevents the T-shaped structure formed by the guide slider 51 and the pull rod 53 from being pulled out of the forming pillar 41. This allows the T-shaped structure formed by the slider 51 and the pull rod 53 to exert a reaction force on the two sliding blocks 52 in the initial stage of mold opening. At this time, the two sliding blocks 52 can slide relative to the upper mold core 30, thereby achieving back-to-back movement of the two sliding blocks 52 to loosen the held product, facilitating subsequent demolding. To ensure that the two sliding blocks 52 can move back-to-back during mold opening, the two inclined guide holes 31 are arranged in a V-shape, with the smaller end pointing towards the upper mold 10.

[0027] It should be noted that the two sliding blocks 52, after being joined together, form a ring shape and constitute part of the outer wall of the molding cavity 60. The area formed in this application is the oil drain hole of the gearbox bottom oil pan, which has a cylindrical structure and has protruding threads or protruding ring ribs on its sidewall. The molding pillar 41 constitutes part of the inner wall of the molding cavity 60. To facilitate demolding, the outer surface of the molding pillar 41 is designed to be smooth. This molding die is designed with a slanted sliding mechanism 50 based on the existing mold. The slanted sliding mechanism 50 is used to gradually open the fasteners during the mold opening process, which is conducive to achieving one-time molding during the product molding process. Among them, the two sliding blocks 52 are joined around the molding pillar 41 and cooperate to form part of the molding cavity 60. This structural design is conducive to molding the ring-shaped local structure. By utilizing the cooperation between the inclined guide hole 31 and the sliding block 52, as well as the design of the pull rod 53, the upper mold core 30 and the lower mold core 40 can gradually separate during the first stage of mold opening. At the same time, the two sliding blocks 52 move in opposite directions and open, thus ensuring the partial demolding of the molded product. During the second stage of mold opening, the upper mold 10 drives the upper mold core 30 to separate from the lower mold core 40, and the pull rod 53 also separates from the forming pillar 41. This makes it easier for workers to remove the product mounted on the forming pillar 41.

[0028] In this application, for ease of installation, the upper mold 10 is provided with an A plate 11, the upper mold core 30 is mounted on the A plate 11, the lower mold core 40 is provided with a B plate 44, the lower mold core 40 is mounted on the B plate 44, the A plate 11 is provided with a clearance hole 12, the guide slider 51 is located in the clearance hole 12, and the upper ends of the two sliding blocks 52 and the upper end of the pull rod 53 are all located in the clearance hole 12.

[0029] Furthermore, in order to prevent the guide slider 51 from deflecting laterally when subjected to the force of the two sliding blocks 52 during operation, and to enable it to move in a predetermined direction, i.e., along the mold opening direction, in one embodiment of this application, the upper mold 10 is provided with at least one positioning post 13. The outward end of all the positioning posts 13 is placed in the clearance hole 12 and is movably inserted into the guide hole 45 of the guide slider 51. There are two positioning posts 13, which are respectively provided at both ends of the guide slider 51.

[0030] In the above-described improved embodiment, in order to prevent the two sliding blocks 52 from separating from the guide slider 51 during operation, in one embodiment of this application, the cross-section of the guide slider 51 is T-shaped, and one end of each of the two sliding blocks 52 is provided with a groove that cooperates with the guide slider 51. In fact, the cross-section of the groove is also T-shaped to fit the cross-section of the guide slider 51.

[0031] In one embodiment of this application, in order to achieve mold opening, the lower mold 20 is provided with an ejector mechanism 70, which is used to lift the upper mold 10. The ejector mechanism 70 can be a conventional ejector plate combined with several different types of ejector pins; these are conventional technologies and essential settings for mold opening. This application will not elaborate on these details.

[0032] See Figures 2 to 4 In one embodiment of this application, to facilitate the processing and disassembly of the forming column 41, the lower mold core 40 is provided with an insertion hole 42. The forming column 41 is movably inserted into the insertion hole 42, and the forming column 41 can only be pulled out from the end of the insertion hole 42 away from the upper mold 10. This structural design ensures that the pulling force of the pull rod 53 on the forming column 41 during mold opening will not cause the forming column 41 to be pulled out of the insertion hole 42. At the same time, it also ensures that the forming column 41 can provide sufficient restraining force to the pull rod 53 so that the two sliding blocks 52 can move relative to the upper mold core 30. In addition, one end of the forming column 41 is provided with a socket 43, and one end of the pull rod 53 is provided with a plug 54 that mates with the socket 43. The plug 54 and the socket 43 are interference fit and can be separated. This design is to ensure that there is a certain friction between the plug 54 and the socket 43. This friction is greater than the force exerted by the two inclined guide holes 31 on the two sliding blocks 52 during the mold opening process. This ensures that in the first stage of mold opening, the two sliding blocks 52 can only slide relative to each other within the two inclined guide holes 31, and do not move along the mold opening direction with the upper mold core 30, which can effectively protect the structure of the formed area.

[0033] In the above embodiments, in order to facilitate molding and subsequent demolding, the diameter of the end of the molding column 41 connected to the pull rod 53 is larger than the diameter of the pull rod 53. This design creates a diameter difference between the molding column 41 and the pull rod 53, which is beneficial for the upper mold core 30 to cover the top of the molding column 41 and avoid burrs at the connection between the upper mold core 30 and the molding column 41 in the molding cavity 60.

[0034] In this application, the sliding block 52 slides on the guide slider 51, which makes the guide slider 51 prone to wear and affects the subsequent mold opening action. In order to facilitate the replacement of the guide slider 51 in the future, the upper end of the pull rod 53 is connected to the guide slider 51 by bolt 55.

[0035] See Figure 2 and Figure 4In one embodiment of this application, since the two sliding blocks 52 are designed in a figure-eight shape, and since the mold design is generally relatively compact, the upper ends of the two blocks will abut against each other. In order to facilitate the installation of the pull rod 53, a notch is provided on the side of the two sliding blocks 52 that cooperate with the guide slider 51 facing each other to avoid the pull rod 53.

[0036] The specific working principle of the mold in this application is as follows: After injection molding is completed, the ejector mechanism 70 is driven to lift the upper mold core 30 together with the upper mold 10. At this time, the upper mold core 30 and the upper mold 10 gradually separate from the lower mold core 40. At this time, the friction between the insert pin 54 and the insert hole 43 is greater than the force exerted by the two inclined guide holes 31 on the two sliding blocks 52, so that the two sliding blocks 52 slide relative to the upper mold core 30 along the guiding direction of the two inclined guide holes 31. This sliding can be decomposed into two movements in the horizontal direction and the mold opening direction. Therefore, in the actual mold opening process, the two sliding blocks 52 will also open relative to each other, thereby causing part of the forming cavity 60 formed by them to be demolded. During this process, the guide slider 51 gradually approaches the side corresponding to the upper mold core 30. As the ejector mechanism 70 continues to rise, the guide slider 51 moves to abut against the upper mold core 30. The upper mold core 30 then applies a pulling force to the pull rod 53 via the guide slider 51. At this point, the pulling force of the insert 54 relative to the insertion hole 43 gradually equals the frictional force between them. As the ejector mechanism 70 continues to rise, when the pulling force of the insert 54 relative to the insertion hole 43 exceeds the frictional force, the upper mold core 30 causes the T-shaped structure formed by the guide slider 51 and the pull rod 53, along with the two sliding blocks 52, to completely separate from the lower mold core 40. The operator can then remove the product mounted on the molding post 41, completing the mold opening operation. During mold closing, only the opposite direction of the mold opening direction needs to be followed. During mold closing, the T-shaped structure formed by the guide slider 51 and the pull rod 53, along with the mutual alignment of the inclined guide hole 31 and the sliding block 52, causes the two sliding blocks 52 to reset within their corresponding inclined guide holes 31, awaiting the next injection molding operation.

[0037] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A molding die for a transmission oil pan, comprising an upper die and a lower die, wherein the upper die has an upper die core, and the lower die has a lower die core that mates with the upper die core, the upper die core and the lower die core mate with each other to form a molding cavity, characterized in that, It also includes a slanted sliding mechanism, which includes a guide slider and a pair of sliding blocks. The same end of the two sliding blocks can be slidably mounted on the guide slider in opposite directions. The upper mold core is provided with two slanted guide holes, and the two sliding blocks can be movably inserted into the two slanted guide holes respectively. The lower mold core is provided with a forming post, and a pull rod is movably clamped on the forming post. The pull rod can be separated from the forming post. The pull rod movably penetrates the upper mold core and is fixedly connected to the guide slider. The other end of the two sliding blocks hugs the outside of the forming post and forms part of the sidewall of the forming cavity. When the upper mold core opens relative to the lower mold core, the two sliding blocks can move in opposite directions.

2. The molding die for a gearbox oil pan according to claim 1, characterized in that: The lower mold core is provided with an insertion hole, and the forming column is movably inserted into the insertion hole. The forming column can only be pulled out from the end of the insertion hole away from the upper mold. The end of the forming column is provided with an insertion hole, and the end of the pull rod is provided with an insertion post that mates with the insertion hole. The insertion post and the insertion hole are interference fit and can be separated from each other.

3. The molding die for a gearbox oil pan according to claim 2, characterized in that: The diameter of the end of the forming column connected to the traction rod is larger than the diameter of the traction rod.

4. A molding die for a transmission oil pan according to claim 1, characterized in that: The upper end of the traction rod is connected to the guide slider by bolts.

5. A molding die for a transmission oil pan according to claim 1, characterized in that: The two positioning blocks have notches on their opposite sides that cooperate with the guide slider, for avoiding the pull rod.

6. A molding die for a transmission oil pan according to any one of claims 1-5, characterized in that: The upper mold is provided with plate A, and the upper mold core is installed on plate A. The lower mold core is provided with plate B, and the lower mold core is installed on plate B. The plate A is provided with clearance holes, and the guide slider is located in the clearance holes. The upper ends of the two sliding blocks and the upper end of the pull rod are all located in the clearance holes.

7. A molding die for a transmission oil pan according to claim 6, characterized in that: The upper mold is provided with at least one positioning post, and the outward end of all the positioning posts is placed in the avoidance hole and is movably inserted into the guide hole of the guide slider.

8. A molding die for a transmission oil pan according to any one of claims 1-5, characterized in that: The cross-section of the guide slider is T-shaped, and one end of each of the two positioning blocks is provided with a groove that cooperates with the guide slider.

9. A molding die for a transmission oil pan according to any one of claims 1-5, characterized in that: The lower mold is provided with an ejector pin mechanism, which is used to lift the upper mold.

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