Injection mold for demolding double inverted buckles
By designing a combined structure of the inclined top assembly and the limiting part in the injection mold, the problem of difficult to release the double-inverted structure products is solved, and the smooth release of the product and the improvement of the yield are achieved.
Patent Information
- Application Number
- CN202421616594.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-07-09
AI Technical Summary
Existing injection molds are difficult to effectively release the double-inverted structure products, which are prone to damage the products and reduce the yield of the products.
A double-inverted mold release injection mold is designed, adopting a combined structure of an inclined top assembly and a limiting part. By driving the cooperation of the inclined plane and the inclined top rod, the buckle protrusion of the inclined top rod is realized to be separated from the inclined groove, and through the cooperation of the limiting part and the inclined top rod, the inclined top rod can eject the product obliquely upward, achieving the smooth mold release of the product.
The smooth demolding of double-inverted structural products is achieved, avoiding the risk of damage to the product during the demolding process and improving the product yield.
Smart Images
Figure CN222959098U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold for double undercut demolding. Background Art
[0002] In the prior art, many products have an undercut structure, and the products cannot be directly and smoothly removed from the injection mold. Usually, an inclined lifter structure or a slider core-pulling structure is adopted to realize the smooth demolding of the undercut structure.
[0003] However, for some products with a double undercut structure, that is, a small undercut structure is provided at the undercut structure of the product, it is relatively difficult to realize demolding through a slider core-pulling structure or a conventional inclined lifter structure. Moreover, the product is easily damaged during the demolding process, reducing the reliability of demolding, resulting in a decrease in the product yield, and greatly affecting the production of the product.
[0004] Therefore, it is necessary to design an injection mold for demolding products with a double undercut structure to ensure the smooth demolding of the products. Summary of the Utility Model
[0005] The purpose of the utility model is to provide an injection mold for double undercut demolding to solve the problem that it is difficult to demold products with a double undercut structure.
[0006] To achieve the above purpose, the utility model adopts the following technical scheme:
[0007] An injection mold for double undercut demolding includes an upper template and a lower template. A cavity for molding a product is arranged between the upper template and the lower template. The lower end of the product has a first undercut inclined surface. The product has an undercut structure, and an undercut groove is arranged at the undercut structure. The undercut groove has a second undercut inclined surface. The injection mold for double undercut demolding further includes an inclined lifter assembly. The inclined lifter assembly includes an inclined lifter seat and an inclined lifter rod. The inclined lifter seat can move in the vertical direction. A driving inclined surface is arranged on the inclined lifter seat. The lower end of the inclined lifter rod is slidably connected with the driving inclined surface. A limiting portion is arranged on the driving inclined surface, and the limiting portion can limit the sliding of the inclined lifter rod. The top surface of the inclined lifter rod is provided with a first fitting inclined surface that cooperates with the first undercut inclined surface. A buckle protrusion for molding the undercut groove is convexly arranged on one side surface of the inclined lifter rod. The bottom surface of the buckle protrusion is provided with a second fitting inclined surface that cooperates with the second undercut inclined surface. The inclination angles of the first fitting inclined surface, the second fitting inclined surface, and the driving inclined surface are the same and the angle with the horizontal plane is less than 5°.
[0008] Furthermore, the inclined lifter rod assembly further includes an inclined lifter block located at the upper end of the inclined lifter rod. The first fitting inclined surface is arranged on the top surface of the inclined lifter block, and the buckle protrusion is convexly arranged on the side surface of the inclined lifter block.
[0009] Furthermore, the inclined lifter block and the inclined lifter rod are integrally formed.
[0010] Further, the inclination angle of the first fitting inclined surface is the same as that of the first reverse buckle inclined surface, and the inclination angle of the second fitting inclined surface is the same as that of the second reverse buckle inclined surface.
[0011] Further, a transmission inclined surface that cooperates with the driving inclined surface is provided at the lower end of the ejector pin.
[0012] Further, the inclination angle of the driving inclined surface is the same as that of the transmission inclined surface.
[0013] Further, a slide rail is provided on the driving inclined surface of the ejector pin base, a sliding groove is provided on the transmission inclined surface corresponding to the slide rail at the lower end of the ejector pin, the sliding groove cooperates with the slide rail, and a limiting portion protrudes on the slide rail.
[0014] Further, the cross-section of the slide rail is T-shaped, and the sliding groove is T-shaped.
[0015] Further, the injection mold for double reverse buckle demolding further includes an ejector plate and a lifting mechanism. The ejector plate is arranged below the lower template, and the lifting mechanism drives the ejector plate to perform lifting motion.
[0016] Further, the ejector pin base is fixed on the ejector plate, and the ejector plate can drive the ejector assembly to perform lifting motion.
[0017] The beneficial effects of the injection mold for double reverse buckle demolding of the present utility model: Through the cooperation of the driving inclined surface and the ejector pin, when the mold is opened, the ejector pin can slide along the driving inclined surface, so that the buckle protrusion of the ejector pin disengages from the reverse buckle groove; through the cooperation of the limiting portion and the ejector pin, after the buckle protrusion disengages from the reverse buckle groove, the ejector pin can eject the product obliquely upward to realize the demolding of the product; by setting the first fitting inclined surface, the second fitting inclined surface, and the driving inclined surface to have the same inclination angle and the angle with the horizontal plane less than 5°, the ejector assembly can smoothly disengage from the product and avoid damaging the product. The injection mold for double reverse buckle demolding not only has a simple structure and realizes the demolding of the product, but also avoids damaging the product during demolding and improves the product yield. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the injection mold for double reverse buckle demolding of Embodiment 1 of the present utility model.
[0019] Figure 2 is Figure 1 The enlarged schematic diagram at A in.
[0020] Figure 3 is Figure 1 A schematic diagram of the reverse buckle structure of the product shown.
[0021] Figure 4 is Figure 1 A schematic diagram of the ejector assembly shown.
[0022] Figure 5 is Figure 4 an enlarged schematic view of part B in
[0023] Figure 6 is Figure 4 an enlarged schematic view of part C in Detailed implementation manners
[0024] The following further describes in detail the detailed implementation manners of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but do not limit the scope of the present utility model.
[0025] The terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc. in the specification and claims of the present utility model indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of clearly expressing the technical solution and description, and therefore should not be construed as a limitation to the present application.
[0026] Please refer to Figures 1-6 , an injection mold with double undercut demolding, including an upper template 10 and a lower template 20. A cavity (not labeled in the figure) for molding a product 50 is provided between the upper template 10 and the lower template 20.
[0027] The lower end of the product 50 has a first undercut inclined surface 51; the product 50 has two symmetrically arranged undercut structures 52, and an undercut groove 53 is provided at the undercut structure 52. The undercut groove 53 has a second undercut inclined surface 531.
[0028] The injection mold with double undercut demolding further includes a lifter assembly 30. In this embodiment, corresponding to the two undercut structures 52 of the product 50, the injection mold with double undercut demolding is provided with two symmetrically arranged lifter assemblies 30, and the lifter assembly 30 is used for demolding the product 50.
[0029] The lifter assembly 30 includes a lifter base 33 and a lifter rod 32. The lifter base 33 can move in the vertical direction. A driving inclined surface 331 is provided on the lifter base 33. The lower end of the lifter rod 32 is slidably connected to the driving inclined surface 331. A limiting portion 332 is provided on the driving inclined surface 331, and the limiting portion 332 can limit the sliding of the lifter rod 32.
[0030] The top surface of the lifter rod 32 is provided with a first fitting inclined surface 34 that cooperates with the first undercut inclined surface 51. A retaining protrusion 35 for forming the undercut groove 53 is convexly provided on one side surface of the lifter rod 32. The bottom surface of the retaining protrusion 35 is provided with a second fitting inclined surface 351 that cooperates with the second undercut inclined surface 531.
[0031] The first fitting slope 34, the second fitting slope 351, and the driving slope 331 have the same inclination angle. The inclination angle of the first fitting slope 34 is the same as the inclination angle of the first inverted slope 51. The inclination angle of the second fitting slope 351 is the same as the inclination angle of the second inverted slope 531. This arrangement ensures that when the inclined push rod 32 slides along the driving slope 331, the first fitting slope 34 does not interfere with the first inverted slope 51, and the second fitting slope 351 does not interfere with the second inverted slope 531.
[0032] The angles between the first fitting slope 34, the second fitting slope 351, and the driving slope 331 and the horizontal plane are all less than 5°. This arrangement can enable the inclined lift assembly 30 to smoothly detach from the product 50 on the one hand, and can prevent the inclined lift assembly 30 from excessively squeezing the product 50 and causing damage on the other hand. The size of the angle depends on the inclination angle of the first undercut slope 51 of the product 50. If the angle is greater than 5°, the inclined lift assembly 30 may squeeze the product 50, causing deformation or even damage. Therefore, the double undercut demoulding injection mold is applied to products where the angle between the first undercut slope 51 and the horizontal plane is less than 5°.
[0033] When the mold is opened, the inclined ejector seat 33 moves upward, the inclined ejector rod 32 slides along the driving inclined surface 331, and at the same time, the inclined ejector rod 32 moves along the first undercut inclined surface 51, and the inclined ejector rod 32 gradually disengages from the undercut structure 52; when the buckling protrusion 35 of the inclined ejector rod 32 disengages from the undercut groove 53 of the product 50, the inclined ejector rod 32 presses against the limiting portion 332 and stops sliding, and the inclined ejector seat 33 continues to move upward to drive the inclined ejector rod 32 to move obliquely upward, and the inclined ejector rod 32 ejects the product 50 to complete the demoulding.
[0034] As described above, the double undercut demoulding injection mold proposed by the utility model, through the cooperation between the driving inclined surface 331 and the inclined ejector rod 32, enables the inclined ejector rod 32 to slide along the driving inclined surface 331 when the mold is opened, so that the buckle protrusion 35 of the inclined ejector rod 32 can be separated from the undercut groove 53; through the cooperation between the limiting portion 332 and the inclined ejector rod 32, after the buckle protrusion 35 is separated from the undercut groove 53, the inclined ejector rod 32 can push the product 50 upward obliquely to realize the demoulding of the product 50; by setting the first fitting inclined surface 34, the second fitting inclined surface 351, and the driving inclined surface 331 to the same inclination angle and the angle with the horizontal plane is less than 5°, the inclined ejector assembly 30 can smoothly realize the separation from the product 50 and avoid damage to the product 50. The double undercut demoulding injection mold is not only simple in structure, realizes the demoulding of the product 50, but also avoids damage to the product 50 during demoulding, thereby improving the product yield.
[0035] See also Figure 1 , Figure 4 and Figure 5 In this embodiment, the inclined ejector rod 32 assembly further includes an inclined ejector block 31 located at the upper end of the inclined ejector rod 32, the first fitting inclined surface 34 is arranged on the top surface of the inclined ejector block 31, and the buckling protrusion 35 is convexly arranged on the side surface of the inclined ejector block 31. The inclined ejector block 31 and the inclined ejector rod 32 are integrally formed.
[0036] More specifically, an upper mold core 11 is installed on the upper mold 10, and a lower mold core 21 is installed on the lower mold 20. The inclined ejector seat 33 is arranged below the lower mold 20. The inclined ejector rod 32 passes through the lower mold 20 and protrudes from the lower mold core 21. The inclined ejector block 31, the upper mold core 11, and the lower mold core 21 together form the cavity.
[0037] See also Figure 6 The lower end of the inclined ejector rod 32 is provided with a transmission inclined surface 321 that cooperates with the driving inclined surface 331, and the inclination angle of the driving inclined surface 331 is the same as the inclination angle of the transmission inclined surface 321. Through the cooperation between the driving inclined surface 331 and the transmission inclined surface 321, the inclined ejector rod 32 can slide more steadily and smoothly on the inclined ejector seat 33, so that the demoulding process of the product 50 is smoother.
[0038] Furthermore, in this embodiment, the inclined ejector seat 33 is provided with a slide rail (not shown) on the driving inclined surface 331, and the lower end of the inclined ejector rod 32 is provided with a slide groove (not shown) on the driving inclined surface 321 corresponding to the slide rail, and the slide groove cooperates with the slide rail, and the limiting portion 332 is convexly provided on the slide rail. The cross section of the slide rail is T-shaped, and the slide groove is T-shaped. Through the cooperation of the slide rail and the slide groove, the inclined ejector rod 32 can slide more steadily and smoothly on the inclined ejector seat 33, so that the demoulding process of the product 50 is smoother.
[0039] See also Figure 1 The double undercut demoulding injection mold further includes an ejector plate 40 and a lifting mechanism (not shown), wherein the ejector plate 40 is disposed below the lower mold plate 20, and the lifting mechanism drives the ejector plate 40 to perform lifting motion. The inclined ejector seat 33 is fixed on the ejector plate 40, and the ejector plate 40 can drive the inclined ejector assembly 30 to perform lifting motion.
[0040] The double undercut demoulding injection mold of the utility model has the beneficial effects of not only having a simple structure and realizing demoulding of products, but also avoiding damage to products during demoulding, thereby improving product yield.
[0041] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A double undercut demoulding injection mold, comprising an upper mold plate and a lower mold plate, a cavity for molding a product is arranged between the upper mold plate and the lower mold plate, the lower end of the product has a first undercut slope, the product has an undercut structure, an undercut groove is arranged at the undercut structure, and the undercut groove has a second undercut slope, characterized in that: The double inverted demolding injection mold also includes a tilted ejector assembly, which includes a tilted ejector seat and a tilted ejector rod. The tilted ejector seat can move in a vertical direction, and a driving inclined surface is provided on the tilted ejector seat. The lower end of the tilted ejector rod is slidably connected to the driving inclined surface, and a limiting portion is provided on the driving inclined surface, and the limiting portion can limit the sliding of the tilted ejector rod. The top surface of the tilted ejector rod is provided with a first fitting inclined surface matching the first inverted inclined surface, and a buckling protrusion for forming the inverted groove is convexly provided on one side surface of the tilted ejector rod, and a second fitting inclined surface matching the second inverted inclined surface is provided on the bottom surface of the buckling protrusion. The inclination angles of the first fitting inclined surface, the second fitting inclined surface and the driving inclined surface are the same, and the angle with the horizontal plane is less than 5°.
2. The double undercut demoulding injection mold according to claim 1, characterized in that: The inclined ejector rod assembly also includes an inclined ejector block located at the upper end of the inclined ejector rod, the first fitting inclined surface is arranged on the top surface of the inclined ejector block, and the buckling protrusion is convexly arranged on the side surface of the inclined ejector block.
3. The double undercut demoulding injection mold according to claim 2, characterized in that: The inclined ejector block and the inclined ejector rod are integrally formed.
4. The double undercut demoulding injection mold according to claim 1, characterized in that: The inclination angle of the first fitting slope is the same as the inclination angle of the first undercut slope, and the inclination angle of the second fitting slope is the same as the inclination angle of the second undercut slope.
5. The double undercut demoulding injection mold according to claim 1, characterized in that: The lower end of the inclined ejector rod is provided with a transmission inclined surface matched with the driving inclined surface.
6. The double undercut demoulding injection mold according to claim 5, characterized in that: The inclination angle of the driving inclined surface is the same as the inclination angle of the transmission inclined surface.
7. The double undercut demoulding injection mold according to claim 6, characterized in that: The inclined lift seat is provided with a slide rail on the driving inclined surface, the lower end of the inclined lift rod is provided with a slide groove on the transmission inclined surface corresponding to the slide rail, the slide groove cooperates with the slide rail, and the limiting portion is convexly arranged on the slide rail.
8. The double undercut demoulding injection mold according to claim 7, characterized in that: The cross section of the slide rail is T-shaped, and the slide groove is T-shaped.
9. The double undercut demoulding injection mold according to claim 1, characterized in that: The double undercut demoulding injection mold further comprises an ejector plate and a lifting mechanism, wherein the ejector plate is arranged below the lower mold plate, and the lifting mechanism drives the ejector plate to perform lifting motion.
10. The double undercut demoulding injection mold according to claim 9, characterized in that: The inclined ejector seat is fixed on the ejector plate, and the ejector plate can drive the inclined ejector assembly to perform lifting motion.