A multi-directional reverse-draft injection mold for a product

Abstract

The application relates to a multi-directional back-drawing injection mold for a product, and belongs to the technical field of injection molds for automobile workpieces. The injection mold comprises a back mold assembly, a back mold plate of the back mold assembly, a back mold cavity of the back mold plate on the front surface of the back mold plate for injection molding workpieces, and a ejector plate located on the back surface of the back mold plate and linearly moving in the direction of approaching or moving away from the back mold plate; an inclined ejector assembly for forming a back-drawing surface of the injection molded workpiece, the inclined ejector assembly comprising a first inclined ejector mechanism, a second inclined ejector mechanism and a third inclined ejector mechanism arranged in sequence along the length direction of the back mold cavity; the ejector plate drives the first inclined ejector mechanism and the second inclined ejector mechanism to move in the direction of approaching or moving away from the back-drawing surface along a first direction, the ejector plate drives the third inclined ejector mechanism to move in the direction of approaching or moving away from the back-drawing surface along a second direction, and the first direction and the second direction are not parallel to each other. The application utilizes multiple groups of inclined ejector mechanisms to cooperate with each other, realizes the structure of the injection molded product according to different motion angle combinations, maintains the function of the product, and improves the assembly matching performance.

Description

A multi-directional undercut demolding injection mold for a product Technical Field

[0001] This invention relates to the field of automotive part injection mold technology, specifically to an injection mold for multi-directional undercut demolding of products. Background Technology

[0002] Injection molds are tools that give plastic products their complete structure and precise dimensions. Injection molding is a processing method used for the mass production of certain complex-shaped parts. Specifically, it refers to injecting molten plastic into a mold cavity under high pressure using an injection molding machine, and then cooling and solidifying it to obtain the molded product.

[0003] The structure of molds can vary greatly depending on the type and properties of the plastic, the shape and structure of the plastic product, and the type of injection molding machine. Injection molds mainly consist of two parts: a moving mold and a fixed mold. The moving mold is mounted on the moving platen of the injection molding machine, and the fixed mold is mounted on the fixed platen. During injection molding, the moving and fixed molds close to form the gating system and cavity. When the mold opens, the moving and fixed molds separate to allow the plastic product to be removed.

[0004] In related technologies, some injection molded products require the design of structures such as flanges and snaps on the back of the product due to the influence of product functions, which leads to the need to design a slanted ejector structure in the injection mold to achieve product molding, thereby ensuring the product's function and quality.

[0005] For example, the characteristics of a certain injection molded product are shown in Figures 1 and 2: This product is a textured appearance part, and the appearance surface must not have any defects that affect visual appearance, such as ejection marks. A necessary mounting structure is required on the back. The mold opening direction is the Z-axis direction. The product's appearance surface 1-a is molded in the front mold cavity, and the product's inner surface 1-b is molded in the rear mold cavity. The product's flange and snap-fit ​​mounting structure create an undercut surface 1-c at this location. Interference exists between the product and the rear mold cavity in the Z-axis direction, making it impossible to directly remove the product.

[0006] As shown in Figure 3: The undercut position of the product is inconsistent in the demolding direction (there are two directions of movement to remove the undercut, Y1 is the negative X direction, and Y2 is the negative X direction clockwise at 15 degrees). This product structure cannot be removed by conventional angled ejector structure. At the same time, the undercut amount of the entire flanging is also inconsistent (the maximum undercut amount L1 is about 45mm, and the minimum undercut amount L2 is about 17mm).

[0007] Existing technical solutions generally involve modifying the product structure: for example, shortening the flange L1 distance, i.e., shortening the flange undercut distance; and changing the Y2 undercut demolding direction to be the same as the Y1 undercut demolding direction. Automated mass production is achieved through a large angled ejector structure in the mold structure to release the undercut.

[0008] However, existing technical solutions, which are common approaches to address the issue of the undercut area of ​​products, have the following drawbacks:

[0009] 1) Shortening the product's flange L1 distance, i.e. the undercut distance, may change the product's shape characteristics;

[0010] 2) Changing the Y2 undercut demolding direction to be the same as the Y1 undercut demolding direction may change the product structure, affect the product function, or affect the product assembly compatibility.

[0011] 3) The mold is designed with a set of inclined ejector structures. During the movement, the inclined ejector block is supported by two inclined ejector rods and maintains a reciprocating motion. During the movement, there is a suspended and swaying state, which affects the service life of the mold and the quality of the product. Summary of the Invention

[0012] This application provides an injection mold for multi-directional undercut demolding of products, which can solve the problem in related technologies where injection molds for injection molded products use a large inclined top structure to achieve automated mass production of undercuts, which leads to changes in the structure of the injection molded product, affects the product function, and affects the product's assembly compatibility.

[0013] This application provides an injection mold for multi-directional undercut demolding of products, including:

[0014] The rear mold assembly includes a rear template, the front side of which is provided with a rear mold cavity for the injection molded workpiece, and an ejector plate located on the back side of the rear template and moving linearly in a direction close to or away from the rear template.

[0015] An inclined ejector assembly is used to form the undercut surface of the injection molded workpiece. The inclined ejector assembly includes a first inclined ejector mechanism, a second inclined ejector mechanism, and a third inclined ejector mechanism arranged sequentially along the length direction of the rear mold cavity.

[0016] The ejector plate drives the first and second inclined ejector mechanisms to move along a first direction toward or away from the undercut surface, and the ejector plate drives the third inclined ejector mechanism to move along a second direction toward or away from the undercut surface. The first and second directions are not parallel to each other.

[0017] In some embodiments: the first inclined ejector mechanism, the second inclined ejector mechanism and the third inclined ejector mechanism are each provided with an inclined ejector rod that passes through the rear template and is slidably connected to the rear template. The angle between the inclined ejector rod of the first inclined ejector mechanism, the second inclined ejector mechanism and the movement direction of the ejector plate gradually decreases.

[0018] In some embodiments: the first inclined top mechanism, the second inclined top mechanism and the third inclined top mechanism are each provided with an inclined top block installed on the front side of the rear template, and each inclined top block is fixedly connected to the top of the inclined top rod of the first inclined top mechanism, the second inclined top mechanism and the third inclined top mechanism respectively;

[0019] The mating surfaces of two adjacent inclined blocks are parallel and fit together. The angle between the mating surfaces of the inclined blocks of the first and second inclined mechanisms and the first direction is α. The angle between the mating surfaces of the inclined blocks of the second and third inclined mechanisms and the first direction is β, and β > α.

[0020] In some embodiments: the undercut depth of the inclined block of the first inclined jacking mechanism is greater than the undercut depth of the inclined block of the second inclined jacking mechanism, and the undercut depth of the inclined block of the second inclined jacking mechanism is greater than the undercut depth of the inclined block of the third inclined jacking mechanism;

[0021] The mating surfaces of the inclined blocks of the first inclined jacking mechanism and the inclined blocks of the second inclined jacking mechanism are inclined towards the inclined blocks of the second inclined jacking mechanism in a direction away from the undercut surface;

[0022] The mating surfaces of the inclined blocks of the second inclined jacking mechanism and the inclined blocks of the third inclined jacking mechanism are inclined toward the inclined blocks of the third inclined jacking mechanism in a direction away from the undercut surface.

[0023] In some embodiments: the inclined block of the third inclined jacking mechanism moves along the second direction in a direction approaching or disengaging from the undercut surface, the angle between the movement of the inclined block of the third inclined jacking mechanism along the second direction and the movement of the inclined blocks of the first and second inclined jacking mechanisms along the first direction is 15 degrees, and the inclined block of the third inclined jacking mechanism disengages from the undercut surface in a direction approaching the inclined block of the second inclined jacking mechanism.

[0024] In some embodiments: the inclined push block includes an undercut core that forms the undercut surface, and a connecting block that connects the inclined push rod, wherein the undercut core and the connecting block are integrally formed;

[0025] The undercut core is provided with an upper mold surface for forming the top surface of the undercut, a side mold surface for forming the side surface of the undercut, and a bottom mold surface for forming the bottom surface of the undercut. The upper mold surface, the side mold surface and the bottom mold surface are smoothly transitioned by rounded corners.

[0026] In some embodiments: the bottom of the connecting block is provided with a first mounting hole for inserting the inclined push rod, and the side of the connecting block is provided with a second mounting hole for inserting the limiting block, the second mounting hole and the first mounting hole being perpendicularly connected to each other;

[0027] The top of the inclined push rod is inserted into the first mounting hole. One side of the top of the inclined push rod is provided with a mounting groove that matches the limiting block. A part of the limiting block is located in the mounting groove, and the other part is located in the second mounting hole and is connected to the inclined push rod by bolts.

[0028] In some embodiments, a straight-push mechanism is also included, the straight-push mechanism including a straight-push block installed on the front side of the rear template, the straight-push block being located on one side of the inclined-push block, a wedge-shaped block being provided on the side of the straight-push block near the inclined-push block, and a wedge-shaped groove adapted to the wedge-shaped block being provided at the connection between the undercut core and the connecting block;

[0029] The bottom of the straight ejector block is fixedly connected to a straight ejector rod that passes through the rear template and is fixedly connected to the ejector plate. The straight ejector rod is slidably connected to the rear template and moves synchronously with the ejector plate to eject the injection molded workpiece.

[0030] In some embodiments: a sliding assembly is fixedly provided on the ejector plate and connected to the bottom of the inclined ejector rod. The sliding assembly includes an inclined ejector seat and an inclined ejector slider. A groove is provided in the inclined ejector seat to slidably connect the inclined ejector slider. The inclined ejector slider is fixedly connected to the bottom of the inclined ejector rod.

[0031] Cooling channels are provided on the inclined blocks of the first and second inclined mechanisms. The inlet and outlet of the cooling channels of each inclined block are respectively connected to an inlet pipe and a return pipe. The inlet pipe and the return pipe are parallel to the inclined rod of each inclined block and are fixedly connected to the inclined slider.

[0032] In some embodiments: it further includes a front mold assembly that cooperates with the rear mold assembly, the front mold assembly including a front template that snaps into the rear template and forms an injection cavity, the top of the front template being connected to a hot runner plate, and the top of the hot runner plate being connected to an upper template.

[0033] The ejector plate has a lower template on the side away from the rear template. A support plate is connected between the lower template and the rear template. The ejector plate reciprocates between the lower template and the rear template. A push plate guide post that penetrates the ejector plate is connected between the lower template and the rear template. A return needle reset rod that penetrates the rear template is fixedly connected to the top of the ejector plate.

[0034] The beneficial effects of the technical solutions provided in this application include:

[0035] This application provides an injection mold for multi-directional undercut demolding of a product. The injection mold of this application includes a rear mold assembly, which comprises a rear template with a rear mold cavity for the injection molded workpiece on its front side, and an ejector plate located on the back side of the rear template and moving linearly in a direction approaching or away from the rear template; and an angled ejector assembly for molding the undercut surface of the injection molded workpiece. The angled ejector assembly includes a first angled ejector mechanism, a second angled ejector mechanism, and a third angled ejector mechanism arranged sequentially along the length of the rear mold cavity. The ejector plate drives the first and second angled ejector mechanisms to move along a first direction in a direction approaching or disengaging from the undercut surface, and the ejector plate drives the third angled ejector mechanism to move along a second direction in a direction approaching or disengaging from the undercut surface. The first and second directions are not parallel to each other.

[0036] Therefore, the injection mold of this application has a slanted ejector assembly on the rear mold platen. This slanted ejector assembly is used to form the undercut surface of the injection molded workpiece. The slanted ejector assembly consists of a first slanted ejector mechanism, a second slanted ejector mechanism, and a third slanted ejector mechanism, which are arranged sequentially along the length of the rear mold cavity. The first and second slanted ejector mechanisms move along a first direction, approaching or disengaging from the undercut surface, driven by the ejector plate. The third slanted ejector mechanism moves along a second direction, also approaching or disengaging from the undercut surface, driven by the ejector plate. The first and second directions are not parallel to each other. This allows multiple slanted ejector mechanisms to work together, combining their different motion angles to achieve the structure of the injection molded product, maintaining product function, and improving the product's assembly and matching performance. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 is a schematic diagram of the structure of injection-molded products in the background art;

[0039] Figure 2 is a cross-sectional view along the AA direction in Figure 1;

[0040] Figure 3 is a schematic diagram of the undercut demolding angle of injection molded products in the background art;

[0041] Figure 4 is a schematic diagram of the structure of the injection mold according to an embodiment of this application;

[0042] Figure 5 is a structural schematic diagram of the rear mold assembly and the inclined top assembly according to an embodiment of this application;

[0043] Figure 6 is a cross-sectional view along the BB direction in Figure 4;

[0044] Figure 7 is a structural schematic diagram of the inclined ejector assembly and the demolding angle of the injection molded product according to an embodiment of this application;

[0045] Figure 8 is a magnified view of part M in Figure 7;

[0046] Figure 9 is a magnified view of point N in Figure 7;

[0047] Figure 10 is a structural schematic diagram of the inclined top assembly before and after ejection in an embodiment of this application.

[0048] Figure 11 is a bottom view of the inclined ejector assembly, the direct ejector mechanism, and the injection-molded product according to an embodiment of this application;

[0049] Figure 12 is a schematic diagram of the structure along the CC direction in Figure 11;

[0050] Figure 13 is a schematic diagram of the structure along the DD direction in Figure 11;

[0051] Figure 14 is a schematic diagram of the structure along the EE direction in Figure 11;

[0052] Figure 15 is a magnified view of a portion of point O in Figure 12;

[0053] Figure 16 is a three-dimensional structural view of the inclined top assembly, the direct top mechanism, and the injection molded product according to an embodiment of this application.

[0054] In the diagram: 1-a, Product exterior surface; 1-b, Product inner surface; 1-c, Undercut surface; 1, Injection molded part; 2, Upper mold plate; 3, Hot runner plate; 4, Front mold plate; 5, Rear mold plate; 6, Support plate; 7, Ejector plate; 8, Ejection limit block; 9, Lower mold plate; 10, Return pin reset rod; 11, Push plate guide post; 12, Rear mold cavity;

[0055] 20. First inclined ejector mechanism; 20a. First inclined ejector block inlet pipe; 20b. First inclined ejector block return pipe; 21. First inclined ejector block; 22. First inclined ejector rod; 23. First inclined ejector rod guide sleeve; 24. First inclined ejector seat; 25. First inclined ejector sliding block; 26. First limiting block; 27. First mounting hole; 28. Second mounting hole; 29. ​​Mounting groove;

[0056] 30. Second inclined ejector mechanism; 31. Second inclined ejector block; 32. Second inclined ejector rod; 33. Second inclined ejector rod guide sleeve; 34. Second inclined ejector seat; 35. Second inclined ejector sliding block; 36. Second limiting block; 37. Second inclined ejector block inlet pipe; 38. Second inclined ejector block return pipe;

[0057] 40. Third inclined ejector mechanism; 41. Third inclined ejector block; 42. Third inclined ejector rod; 43. Inclined ejector rod guide sleeve; 44. Third inclined ejector seat; 45. Third inclined ejector sliding block; 46. Third limiting block; 50. Straight ejector mechanism; 51. Straight ejector block; 52. Straight ejector rod; 53. Straight ejector rod fixing block; 54. Straight ejector block inlet pipe; 55. Straight ejector block return pipe; 56. Straight ejector rod guide sleeve.

[0058] a. Upper mold surface; b. Side mold surface; c. Bottom mold surface; d. Wedge groove; e. Top mating surface of the ejector block. Detailed Implementation

[0059] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0060] This application provides an injection mold for multi-directional undercut demolding of products, which can solve the problem in related technologies where injection molds for injection molded products use a large inclined top structure to achieve automated mass production of undercuts, which leads to changes in the structure of the injection molded product, affects the product function, and affects the product's assembly compatibility.

[0061] Referring to Figures 4 to 7, this application provides an injection mold for multi-directional undercut demolding of a product, comprising:

[0062] The rear mold assembly includes a rear mold plate 5, a rear mold cavity 12 for the injection molded workpiece 1 on the front side of the rear mold plate 5, and an ejector plate 7 located on the back side of the rear mold plate 5 and moving linearly in a direction close to or away from the rear mold plate 5. The rear mold cavity 12 in the rear mold plate 5 is provided with two sets of symmetrically arranged punches, which can simultaneously inject two injection molded workpieces 1 during another injection molding process.

[0063] An inclined ejector assembly is used to mold the undercut surface 1-c of the injection molded workpiece 1. The inclined ejector assembly includes a first inclined ejector mechanism 20, a second inclined ejector mechanism 30 and a third inclined ejector mechanism 40 arranged sequentially along the length direction of the rear mold cavity 12. The first inclined ejector mechanism 20, the second inclined ejector mechanism 30 and the third inclined ejector mechanism 40 cooperate with each other to jointly injection mold the undercut surface 1-c of the injection molded workpiece 1, and each can be demolded in a set direction.

[0064] The ejector plate 7 drives the first inclined ejector mechanism 20 and the second inclined ejector mechanism 30 to move along the first direction in a direction that approaches or disengages from the undercut surface 1-c. The ejector plate 7 drives the third inclined ejector mechanism 40 to move along the second direction in a direction that approaches or disengages from the undercut surface 1-c. The first direction and the second direction are not parallel to each other, thereby satisfying the smooth demolding of the undercut surface 1-c of the injection molded workpiece 1 while also satisfying the product structure and performance of the injection molded product 1.

[0065] The injection mold of this application embodiment is provided with a slanted ejector assembly on the rear template 5. The slanted ejector assembly is used to form the undercut surface 1-c of the injection molded workpiece 1. The slanted ejector assembly is composed of a first slanted ejector mechanism 20, a second slanted ejector mechanism 30 and a third slanted ejector mechanism 40, and the first slanted ejector mechanism 20, the second slanted ejector mechanism 30 and the third slanted ejector mechanism 40 are arranged sequentially along the length direction of the rear mold cavity 12.

[0066] The first and second inclined ejector mechanisms 20 and 30 move along a first direction, approaching or disengaging from the undercut surface 1-c, driven by the ejector plate 7. The third inclined ejector mechanism 40 moves along a second direction, also approaching or disengaging from the undercut surface 1-c, driven by the ejector plate 7. The first and second directions are not parallel. This allows multiple inclined ejector mechanisms to work together, combining their different motion angles to achieve the structure of the injection-molded product, maintaining its functionality and improving its assembly and matching performance.

[0067] In some alternative embodiments: Referring to Figures 7 to 14, this application provides an injection mold for multi-directional undercut demolding of a product. The first inclined ejector mechanism 20, the second inclined ejector mechanism 30 and the third inclined ejector mechanism 40 of the injection mold are each provided with an inclined ejector rod that passes through the rear template 5 and is slidably connected to the rear template 5. The angle between the inclined ejector rods of the first inclined ejector mechanism 20, the second inclined ejector mechanism 30 and the movement direction of the ejector plate 7 gradually decreases.

[0068] Specifically, the first inclined ejector mechanism 20 includes a first inclined ejector block 21 mounted on the rear template 5, and a first inclined ejector rod 22 passing through the rear template 5 and slidably connected to the rear template 5. A first inclined ejector rod guide sleeve 23 fixed inside the rear template 5 is sleeved on the first inclined ejector rod 22. The top of the first inclined ejector rod 22 is fixedly connected to the first inclined ejector block 21. The bottom of the first inclined ejector rod 22 is connected to a first sliding assembly fixed to the ejector plate 7. The first sliding assembly includes a first inclined ejector seat 24 and a first inclined ejector slider 25. A groove is provided in the first inclined ejector seat 24 to slidably connect the first inclined ejector slider 25. The first inclined ejector slider 25 is fixedly connected to the bottom of the first inclined ejector rod 22.

[0069] The second inclined ejector mechanism 30 includes a second inclined ejector block 31 mounted on the rear template 5, and a second inclined ejector rod 32 passing through and slidably connected to the rear template 5. A second inclined ejector rod guide sleeve 33 fixed inside the rear template 5 is sleeved on the second inclined ejector rod 32. The top of the second inclined ejector rod 32 is fixedly connected to the second inclined ejector block 31. The bottom of the second inclined ejector rod 32 is connected to a second sliding assembly fixed to the ejector plate 7. The second sliding assembly includes a second inclined ejector seat 34 and a second inclined ejector slider 35. A groove is provided in the second inclined ejector seat 34 to slidably connect the second inclined ejector slider 35. The second inclined ejector slider 35 is fixedly connected to the bottom of the second inclined ejector rod 32.

[0070] The third inclined ejector mechanism 40 includes a third inclined ejector block 41 mounted on the rear template 5, and a third inclined ejector rod 42 passing through and slidably connected to the rear template 5. A third inclined ejector rod guide sleeve 43 fixed inside the rear template 5 is sleeved on the third inclined ejector rod 42. The top of the third inclined ejector rod 42 is fixedly connected to the third inclined ejector block 41. The bottom of the third inclined ejector rod 42 is connected to a third sliding assembly fixed to the ejector plate 7. The third sliding assembly includes a third inclined ejector seat 44 and a third inclined ejector slider 45. A groove is provided in the third inclined ejector seat 44 to slidably connect the third inclined ejector slider 45. The third inclined ejector slider 45 is fixedly connected to the bottom of the third inclined ejector rod 42.

[0071] The mating surfaces of two adjacent inclined blocks are parallel and fit together; that is, the mating surfaces of the first inclined block 21 and the second inclined block 31 are parallel and fit together, and the mating surfaces of the second inclined block 31 and the third inclined block 41 are parallel and fit together. The angle between the mating surfaces of the first inclined block 21 of the first inclined mechanism 20 and the second inclined block 31 of the second inclined mechanism 30 and the first direction is α, and the angle between the mating surfaces of the second inclined block 31 of the second inclined mechanism 30 and the third inclined block 41 of the third inclined mechanism 40 and the first direction is β, where β > α. α is preferably, but not limited to, 5 degrees, and β is preferably, but not limited to, 35 degrees. The first direction is the X-axis direction.

[0072] In some alternative embodiments: Referring to Figures 7 to 14, this application provides an injection mold for multi-directional undercut demolding of a product. The undercut depth formed by the first inclined ejector block 21 of the first inclined ejector mechanism 20 of this injection mold is greater than the undercut depth formed by the second inclined ejector block 31 of the second inclined ejector mechanism 30. The undercut depth formed by the second inclined ejector mechanism 30 is greater than the undercut depth formed by the third inclined ejector block 41 of the third inclined ejector mechanism 40. In order to achieve different undercut depths for the first inclined ejector block 21, the second inclined ejector block 31, and the third inclined ejector block 41, the angles between the inclined ejector rods of the first, second, and third inclined ejector mechanisms and the movement direction of the ejector plate gradually decrease.

[0073] Specifically, in this embodiment, the angle between the first inclined ejector rod 22 of the first inclined ejector mechanism 20 and the direction of movement of the ejector plate 7 is 10°; the angle between the second inclined ejector rod 32 of the second inclined ejector mechanism 30 and the direction of movement of the ejector plate 7 is 6°; and the angle between the third inclined ejector rod 32 of the third inclined ejector mechanism 40 and the direction of movement of the ejector plate 7 is 4°. This results in the demolding distance of the first inclined ejector mechanism 20 being greater than that of the second inclined ejector mechanism 30, and the demolding distance of the second inclined ejector mechanism 30 being greater than that of the third inclined ejector mechanism 40.

[0074] In this embodiment, the tilt angle of each inclined ejector is designed based on the undercut amount of each inclined ejector block area. The undercut amount of the first inclined ejector mechanism 20 area is about 45mm, the undercut amount of the second inclined ejector mechanism 30 area is about 25mm, and the undercut amount of the third inclined ejector mechanism 40 area is about 17mm. Considering the safety distance of the undercut after ejection, the mold ejection distance is designed to be 270mm. Therefore, the slope of the first inclined ejector 22 is designed to be 10 degrees, the slope of the second inclined ejector 32 is designed to be 6 degrees, and the slope of the third inclined ejector 42 is designed to be 4 degrees.

[0075] The angle between the mating surface of the first inclined block 21 of the first inclined mechanism 20 and the second inclined block 31 of the second inclined mechanism 30 and the first direction is α, and the angle between the mating surface of the second inclined block 31 of the second inclined mechanism 30 and the third inclined block 41 of the third inclined mechanism 40 and the first direction is β, and β > α.

[0076] The slope α of the contact surface between the first inclined ejector block 21 and the second inclined ejector block 31 is ≥5 degrees, and the slope β of the contact surface between the second inclined ejector block 31 and the third inclined ejector block 41 is ≥35°, ensuring that the first inclined ejector block 21, the second inclined ejector block 31, and the third inclined ejector block 41 do not interfere with each other during movement. This further prevents the first inclined ejector mechanism 20, the second inclined ejector mechanism 30, and the third inclined ejector mechanism 40 from rubbing against each other during movement. By utilizing the difference in their movement clearances, multi-directional undercut demolding of the product is achieved, thus meeting product design requirements.

[0077] The mating surfaces of the first inclined ejector block 21 of the first inclined ejector mechanism 20 and the second inclined ejector block 31 of the second inclined ejector mechanism 30 are inclined towards the second inclined ejector block 31 of the second inclined ejector mechanism 30 in a direction away from the undercut surface 1-c. The mating surfaces of the second inclined ejector block 31 of the second inclined ejector mechanism 30 and the third inclined ejector block 41 of the third inclined ejector mechanism 40 are inclined towards the third inclined ejector block 41 of the third inclined ejector mechanism 40 in a direction away from the undercut surface 1-c, thereby achieving the formation of a clearance difference between the inclined ejector blocks during mold closing or demolding, and preventing mutual wear.

[0078] In some alternative embodiments: Referring to Figures 7 to 14, this application embodiment provides an injection mold for multi-directional undercut demolding of a product. The third inclined ejector block 41 of the third inclined ejector mechanism 40 of the injection mold moves along a second direction in a direction approaching or disengaging from the undercut surface 1-c. The angle between the movement of the third inclined ejector block 41 of the third inclined ejector mechanism 40 along the second direction and the movement of the first inclined ejector block 21 of the first inclined ejector mechanism 20 and the movement of the second inclined ejector block 31 of the second inclined ejector mechanism 30 along the first direction is 15 degrees, and the third inclined ejector block 41 of the third inclined ejector mechanism 40 disengages from the undercut surface 1-c in a direction approaching the second inclined ejector block 31 of the second inclined ejector mechanism 30.

[0079] In some alternative embodiments: Referring to Figures 6 to 15, this application provides an injection mold for multi-directional undercut demolding of a product. The first inclined ejector block 21 of the injection mold includes an undercut core that forms the undercut surface 1-c, and a connecting block that connects to the first inclined ejector rod 22. The undercut core and the connecting block are integrally formed. The undercut core is provided with an upper mold surface a for forming the top surface of the undercut, a side mold surface b for forming the side surface of the undercut, and a bottom mold surface c for forming the bottom surface of the undercut. The upper mold surface a, the upper mold surface b, and the bottom mold surface c are smoothly transitioned by rounded corners.

[0080] The bottom of the connecting block has a first mounting hole 27 for inserting the first inclined push rod 22, and the side of the connecting block has a second mounting hole 28 for inserting the first limiting block 26. The second mounting hole 28 and the first mounting hole 27 are perpendicularly connected to each other. The top of the first inclined push rod 22 is inserted into the first mounting hole 27. One side of the top of the first inclined push rod 22 has a mounting groove 29 that matches the first limiting block 26. A part of the first limiting block 26 is located in the mounting groove 29, and the other part is located in the second mounting hole 28 and is connected to the first inclined push rod 22 by bolts.

[0081] The second inclined ejector block 31 includes an undercut core forming the undercut surface 1-c, and a connecting block connecting the second inclined ejector rod 32. The undercut core and the connecting block are integrally formed. The undercut core is provided with an upper mold surface a forming the top surface of the undercut, a side mold surface b forming the side surface of the undercut, and a bottom mold surface c forming the bottom surface of the undercut. The upper mold surface a, the upper mold surface b, and the bottom mold surface c are smoothly transitioned by rounded corners.

[0082] The bottom of the connecting block has a first mounting hole 27 for inserting the second inclined push rod 32, and the side of the connecting block has a second mounting hole 28 for inserting the second limiting block 36. The second mounting hole 28 and the first mounting hole 27 are perpendicularly connected to each other. The top of the second inclined push rod 32 is inserted into the first mounting hole 27. One side of the top of the second inclined push rod 32 has a mounting groove 29 for cooperating with the second limiting block 36. A part of the second limiting block 36 is located in the mounting groove 29, and the other part is located in the second mounting hole 28 and is connected to the second inclined push rod 32 by bolts.

[0083] The third inclined ejector block 41 includes an undercut core forming the undercut surface 1-c, and a connecting block connecting the third inclined ejector rod 42. The undercut core and the connecting block are integrally formed. The undercut core is provided with an upper mold surface a forming the top surface of the undercut, a side mold surface b forming the side surface of the undercut, and a bottom mold surface c forming the bottom surface of the undercut. The upper mold surface a, the upper mold surface b, and the bottom mold surface c are smoothly transitioned by rounded corners.

[0084] The bottom of the connecting block has a first mounting hole 27 for inserting the third inclined push rod 42, and the side of the connecting block has a second mounting hole 28 for inserting the third limiting block 46. The second mounting hole 28 and the first mounting hole 27 are perpendicularly connected to each other. The top of the third inclined push rod 42 is inserted into the first mounting hole 27. One side of the top of the third inclined push rod 42 has a mounting groove 29 for cooperating with the third limiting block 46. A part of the third limiting block 46 is located in the mounting groove 29, and the other part is located in the second mounting hole 28 and is connected to the third inclined push rod 42 by bolts.

[0085] In some alternative embodiments: Referring to Figures 6, 11, and 16, this application embodiment provides an injection mold for multi-directional undercut demolding of a product. The injection mold further includes a straight ejector mechanism 50, which includes a straight ejector block 51 mounted on the front of the rear template 5. The straight ejector block 51 is located on one side of the first inclined ejector block 21, the second inclined ejector block 31, and the third inclined ejector block 41. A wedge-shaped block is provided on the side of the straight ejector block 51 near the first inclined ejector block 21, the second inclined ejector block 31, and the third inclined ejector block 41. A wedge-shaped groove d adapted to the wedge-shaped block is provided at the connection between the undercut core of the first inclined ejector block 21, the second inclined ejector block 31, and the third inclined ejector block 41 and the connecting block.

[0086] The wedge-shaped block of the straight ejector block 51 and the wedge-shaped grooves of the first inclined ejector block 21, the second inclined ejector block 31 and the third inclined ejector block 41 are in contact in the mold opening direction. This allows the straight ejector block 51 to press the first inclined ejector block 21, the second inclined ejector block 31 and the third inclined ejector block 41 back to their original positions simultaneously if the first inclined ejector block 21, the second inclined ejector block 31 and the third inclined ejector block 41 do not return to their original positions in time when the mold is closed.

[0087] A straight ejector block 51 has a straight ejector rod 52 fixedly connected to its bottom, which passes through the rear mold plate 5 and is fixedly connected to the ejector plate 7. A straight ejector rod guide sleeve 56 located inside the rear mold 5 is slidably connected to the straight ejector rod 52. The bottom of the straight ejector rod 52 is fixedly connected to the ejector plate 7 via a straight ejector rod fixing block 53. The straight ejector rod 52 is slidably connected to the rear mold plate 5 and moves synchronously with the ejector plate 7 to eject the injection molded workpiece 1. The straight ejector block 51 has a cooling channel. The inlet and outlet of the cooling channel of the straight ejector block 51 are respectively connected to a straight ejector block inlet pipe 54 and a straight ejector block return pipe 55. Both the straight ejector block inlet pipe 54 and the straight ejector block return pipe 55 are parallel to the straight ejector rod 52 and fixedly connected to the straight ejector rod fixing block 53.

[0088] In some alternative embodiments: Referring to Figure 16, this application provides an injection mold for multi-directional undercut demolding of a product. The ejector plate 7 of the injection mold is fixedly provided with a sliding component connected to the bottom of the inclined ejector rod. The sliding component includes an inclined ejector seat and an inclined ejector slider. The inclined ejector seat has a groove for slidingly connecting the inclined ejector slider. The inclined ejector slider is fixedly connected to the bottom of the inclined ejector rod.

[0089] The bottom of the first inclined push rod 22 is connected to the first sliding assembly. The first sliding assembly includes a first inclined push seat 24 and a first inclined push slider 25. The first inclined push seat 24 has a sliding groove for slidingly connecting the first inclined push slider 25. The first inclined push slider 25 is fixedly connected to the bottom of the first inclined push rod 22.

[0090] The bottom of the second inclined rod 32 is connected to the second sliding assembly, which includes a second inclined base 34 and a second inclined slider 35. The second inclined base 34 has a groove for slidingly connecting the second inclined slider 35, and the second inclined slider 35 is fixedly connected to the bottom of the second inclined rod 32.

[0091] The bottom of the third inclined push rod 42 is connected to the third sliding assembly, which includes a third inclined push seat 44 and a third inclined push slider 45. The third inclined push seat 44 has a sliding groove for slidingly connecting the third inclined push slider 45, and the third inclined push slider 45 is fixedly connected to the bottom of the third inclined push rod 42.

[0092] The first inclined pusher block 21 of the first inclined pusher mechanism 20 has a cooling channel. The inlet and outlet of the cooling channel of the first inclined pusher block 21 are respectively connected to the first inclined pusher block inlet pipe 20a and the first inclined pusher block return pipe 20b. The first inclined pusher block inlet pipe 20a and the first inclined pusher block return pipe 20b are parallel to the first inclined pusher rod 22 and are fixedly connected to the first inclined pusher slider 25.

[0093] The second inclined pusher block 31 of the second inclined pusher mechanism 30 is provided with a cooling flow channel. The inlet and outlet of the cooling flow channel of the second inclined pusher block 31 are respectively connected to the second inclined pusher block inlet pipe 37 and the second inclined pusher block return pipe 38. The second inclined pusher block inlet pipe 37 and the second inclined pusher block return pipe 38 are parallel to the second inclined pusher rod 32 and are fixedly connected to the second inclined pusher slider 35.

[0094] In some alternative embodiments: Referring to Figures 4 to 6, this application provides an injection mold for multi-directional undercut demolding of a product. The injection mold further includes a front mold assembly that cooperates with the rear mold assembly. The front mold assembly includes a front mold plate 4 that interlocks with the rear mold plate 5 to form an injection cavity. A hot runner plate 3 is connected to the top of the front mold plate 4, and an upper mold plate 2 is connected to the top of the hot runner plate 3. After the front mold plate 4, rear mold plate 5, straight ejector block 51, first inclined ejector block 21, second inclined ejector block 31, and third inclined ejector block 41 are closed, they together form the cavity for molding the injection molded product 1. The top of the straight ejector block 51 has a straight ejector block top mating surface e that cooperates with the upper mold plate 4, and the straight ejector block top mating surface e serves a sealing function.

[0095] A lower template 9 is provided on the side of the ejector plate 7 away from the rear template 5. A support plate 6 connects the lower template 9 and the rear template 5. The ejector plate 7 reciprocates between the lower template 9 and the rear template 5. A push plate guide post 11 that penetrates the ejector plate 7 is connected between the lower template 9 and the rear template 5. One end of the push plate guide post 11 is fixed on the lower template 9, and the other end penetrates the ejector plate 7 and is inserted into the back of the rear template 5. Its function is to guide the mold when it opens and closes. The ejector plate 7 and the ejection structure fixed on the ejector plate 7 can move smoothly up and down between the rear template 5 and the lower template 9.

[0096] A return pin reset rod 10, which penetrates the rear template 5, is fixedly connected to the top of the ejector plate 7. One end of the return pin reset rod 10 is fixed to the ejector plate 7, and the other end penetrates the rear template 5. The top surface of the return pin reset rod 10 contacts the front template 4, which serves to push the ejection mechanism back to its original position when the mold is closed. An ejection limit block 8 is fixedly provided on the side of the ejector plate 7 near the rear template 5. This ejection limit block 8 is used to adjust the ejection distance of the ejector plate 7 in the direction of the rear template 5.

[0097] During the mold opening process, driven by the ejector plate 7, the inclined ejector assembly tilts and ejects until the first inclined ejector block 21, the second inclined ejector block 31 and the third inclined ejector block 41 disengage from the undercut molding cavity. At the same time, it drives the straight ejector mechanism 50 and other ejection mechanisms to eject the injection molded product 1 in the mold opening direction until the injection molded product 1 disengages from the straight ejector block 51 and the rear template 5. Then, the robot arm picks up the injection molded product 1, thereby realizing automated mass production.

[0098] During mold closing, the angled ejector assembly and the straight ejector mechanism 50 return to their original positions under the action of the ejector plate 7 and the pressure of the return pin reset rod 10 on the front mold plate 4. However, in abnormal situations, when the ejector plate 7 returns to its original position, the angled ejector assembly may not return to its original position or may not return to its final position, which could lead to damage to the front mold plate 4. Therefore, this application designs a combination of the straight ejector mechanism 50 and the angled ejector assembly. The top surface of the straight ejector block 51 is in contact with the top surface of the front mold plate 4 in the mold closing state. If the angled ejector block of the angled ejector assembly does not return to its original position during the mold closing process, the front mold plate 4 will eventually press the straight ejector mechanism 50 to return to its original position, and at the same time, the straight ejector mechanism will drive the angled ejector assembly to return to its original position, thus completing the mold closing process.

[0099] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and 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 of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0100] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0101] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An injection mold for multi-directional undercut demolding of a product, characterized in that, include: The rear mold assembly includes a rear template (5), the front of which is provided with a rear mold cavity (12) for the injection molded workpiece (1), and an ejector plate (7) located on the back of the rear template (5) and moving linearly in a direction close to or away from the rear template (5); an angled ejector assembly is used to form the undercut surface (1-c) of the injection molded workpiece (1), the angled ejector assembly includes a first angled ejector mechanism (20), a second angled ejector mechanism (30) and a third angled ejector mechanism (40) arranged sequentially along the length direction of the rear mold cavity (12); the ejector plate (7) drives the first angled ejector mechanism (20) and the second angled ejector mechanism (30) to move in a first direction in a direction close to or away from the undercut surface (1-c), the ejector plate (7) drives the third angled ejector mechanism (40) to move in a second direction in a direction close to or away from the undercut surface (1-c), the first direction and the second direction are not parallel to each other; the first angled ejector mechanism (20), the second angled ejector mechanism (30) and the third angled ejector mechanism (40) are arranged in a first ... ejector plate (7) drives the third angled ejector mechanism (40) to move in a second direction in a direction close to or away from the undercut surface (1-c), the first direction and the second direction are not parallel to each other; the first angled ejector mechanism (20), the second angled ejector mechanism (30) and the third angled ejector mechanism (40) are arranged in a first direction in a direction close to or away from the undercut surface (1-c) in Both mechanism (30) and the third inclined top mechanism (40) are provided with inclined top rods that penetrate into the rear template (5) and slide in connection with the rear template (5). The angle between the inclined top rods of the first inclined top mechanism (20), the second inclined top mechanism (30) and the movement direction of the ejector plate (7) gradually decreases. The first inclined top mechanism (20), the second inclined top mechanism (30) and the third inclined top mechanism (40) are each provided with an inclined top block installed on the front of the rear template (5). The inclined blocks are fixedly connected to the top of the inclined rods of the first inclined mechanism (20), the second inclined mechanism (30) and the third inclined mechanism (40), respectively; the mating surfaces of two adjacent inclined blocks are parallel and fit together, the angle between the mating surfaces of the inclined blocks of the first inclined mechanism (20) and the inclined blocks of the second inclined mechanism (30) and the first direction is α, the angle between the mating surfaces of the inclined blocks of the second inclined mechanism (30) and the inclined blocks of the third inclined mechanism (40) and the first direction is β, and β > α.

2. The injection mold for multi-directional undercut demolding of a product as described in claim 1, characterized in that: The undercut depth of the inclined block of the first inclined top mechanism (20) is greater than that of the inclined block of the second inclined top mechanism (30), and the undercut depth of the inclined block of the second inclined top mechanism (30) is greater than that of the inclined block of the third inclined top mechanism (40); the mating surfaces of the inclined blocks of the first inclined top mechanism (20) and the inclined blocks of the second inclined top mechanism (30) are inclined toward the inclined blocks of the second inclined top mechanism (30) in a direction away from the undercut surface (1-c); the mating surfaces of the inclined blocks of the second inclined top mechanism (30) and the inclined blocks of the third inclined top mechanism (40) are inclined toward the inclined blocks of the third inclined top mechanism (40) in a direction away from the undercut surface (1-c).

3. The injection mold for multi-directional undercut demolding of a product as described in claim 1, characterized in that: The inclined block of the third inclined jacking mechanism (40) moves along the second direction in a direction approaching or disengaging from the undercut surface (1-c). The angle between the movement of the inclined block of the third inclined jacking mechanism (40) along the second direction and the movement of the inclined blocks of the first inclined jacking mechanism (20) and the second inclined jacking mechanism (30) along the first direction is 15 degrees. The inclined block of the third inclined jacking mechanism (40) disengages from the undercut surface (1-c) in a direction approaching the inclined block of the second inclined jacking mechanism (30).

4. The injection mold for multi-directional undercut demolding of a product as described in claim 1, characterized in that: The inclined ejector block includes an undercut core that forms the undercut surface (1-c) and a connecting block that connects the inclined ejector rod. The undercut core and the connecting block are integrally formed. The undercut core is provided with an upper mold surface (a) for forming the top surface of the undercut, a side mold surface (b) for forming the side surface of the undercut, and a bottom mold surface (c) for forming the bottom surface of the undercut. The upper mold surface (a), the side mold surface (b), and the bottom mold surface (c) are smoothly transitioned by rounded corners.

5. The injection mold for multi-directional undercut demolding of a product as described in claim 4, characterized in that: The bottom of the connecting block is provided with a first mounting hole (27) for inserting the inclined push rod, and the side of the connecting block is provided with a second mounting hole (28) for inserting the limiting block. The second mounting hole (28) and the first mounting hole (27) are perpendicularly connected to each other. The top of the inclined push rod is inserted into the first mounting hole (27). One side of the top of the inclined push rod is provided with a mounting groove (29) that matches the limiting block. A part of the limiting block is located in the mounting groove (29), and the other part is located in the second mounting hole (28) and is connected to the inclined push rod by bolts.

6. The injection mold for multi-directional undercut demolding of a product as described in claim 4, characterized in that: It also includes a straight ejector mechanism (50), which includes a straight ejector block (51) installed on the front of the rear template (5). The straight ejector block (51) is located on one side of the inclined ejector block. A wedge block is provided on the side of the straight ejector block (51) near the inclined ejector block. A wedge groove (d) adapted to the wedge block is provided at the connection between the undercut core and the connecting block. A straight ejector rod (52) is fixedly connected to the bottom of the straight ejector block (51), which passes through the rear template (5) and is fixedly connected to the ejector plate (7). The straight ejector rod (52) is slidably connected to the rear template (5) and moves synchronously with the ejector plate (7) to eject the injection molded workpiece (1).

7. The injection mold for multi-directional undercut demolding of a product as described in claim 1, characterized in that: The ejector plate (7) is fixedly provided with a sliding assembly connected to the bottom of the inclined ejector rod. The sliding assembly includes an inclined ejector seat and an inclined ejector slider. The inclined ejector seat has a sliding groove for sliding connection of the inclined ejector slider. The inclined ejector slider is fixedly connected to the bottom of the inclined ejector rod. The first inclined ejector mechanism (20) and the second inclined ejector mechanism (30) are both provided with cooling channels on their inclined ejector blocks. The inlet and outlet of the cooling channel of each inclined ejector block are respectively connected to an inlet pipe and a return pipe. The inlet pipe and the return pipe are parallel to the inclined ejector rod connected to each inclined ejector block and are fixedly connected to the inclined ejector slider.

8. The injection mold for multi-directional undercut demolding of a product as described in claim 1, characterized in that: It also includes a front mold assembly that cooperates with the rear mold assembly. The front mold assembly includes a front mold plate (4) that interlocks with the rear mold plate (5) and forms an injection cavity. A hot runner plate (3) is connected to the top of the front mold plate (4), and an upper mold plate (2) is connected to the top of the hot runner plate (3). A lower mold plate (9) is provided on the side of the ejector plate (7) away from the rear mold plate (5). A support plate (6) is connected between the lower mold plate (9) and the rear mold plate (5). The ejector plate (7) reciprocates between the lower mold plate (9) and the rear mold plate (5). A push plate guide post (11) that penetrates the ejector plate (7) is connected between the lower mold plate (9) and the rear mold plate (5). A return pin reset rod (10) that penetrates the rear mold plate (5) is fixedly connected to the top of the ejector plate (7).

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