Mold core module for preventing product from being pulled due to back-off and injection mold
The movement of the slider is controlled by the shovel and the return part, which solves the problem of straining when the inverted product is demolded, and a demolding solution for small space needs is achieved to ensure product safety.
Patent Information
- Application Number
- CN202422606509.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-10-28
AI Technical Summary
During demolding, the inverted product is easily strained by the projection, and when the mold size is small or multiple cores, the oblique top is difficult to set, resulting in large space requirements.
The slider is used to control the movement of the slider to achieve the forming part protruding out of the core. When opening the mold, the slider is driven into the core by returning parts such as bead screws to avoid interference with the mold release of the product, and the space requirement is small.
It realizes that the product does not interfere with when demolding, reduces space requirements, ensures product safety, and is simple and easy to promote.
Smart Images
Figure CN223252276U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of molds, in particular to a core mold set and an injection mold for preventing products from being damaged by undercutting. Background Art
[0002] Products with internal undercuts often encounter the following problems: during demoulding, the corresponding protrusions used for undercut molding will interfere with the demoulding of the product, which can easily cause the product to be stretched during normal ejection.
[0003] Based on this situation, a slanted top is usually used to demould the product. However, when the mold is small or there are multiple cores in the mold, the slanted top is often difficult to set up due to the large space requirements.
[0004] Therefore, there is an urgent need for a solution that can prevent the protrusions from affecting demoulding and has a small space requirement. Utility Model Content
[0005] In order to solve the above technical problems, the utility model provides a core module and an injection mold that prevent the product from being damaged by undercuts. The core module and the injection mold can control the molding part to extend when the mold is closed, and control the molding part to retract into the core when the mold is opened, thereby requiring less space and avoiding damage by undercuts.
[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:
[0007] The utility model provides a core mold assembly for preventing products from being buckled and pulled, comprising a shovel, a core, a slider, and a return member, wherein the shovel is arranged on an external front mold, and the core, the slider, and the return member are all arranged on an external rear mold, and the front mold and the rear mold cooperate with each other; the core is provided with a sliding groove, and the slider has a control groove and a forming part, the control groove is used to accommodate the shovel, and the forming part is slidably arranged in the sliding groove;
[0008] When closing the mold, the shovel is inserted into the control groove to drive the slider to slide, so as to control the molding part to protrude out of the sliding groove and be used for the undercut of the molded product; when opening the mold, the shovel leaves the control groove, and the return part forces the slider to slide, so as to control the molding part to be completely retracted into the core.
[0009] Furthermore, the forming portion is arranged on the top of one end of the slider, and the return member is located at the other end of the slider, and the return member contacts / connects the other end of the slider.
[0010] Furthermore, the return member is a ball screw.
[0011] Furthermore, a first inclined surface is provided on both sides of the control groove, the bottoms of the two first inclined surfaces are close to each other and the tops are far away from each other; a second inclined surface is provided on both sides of the bottom of the shovel, and the two first inclined surfaces conflict with the two second inclined surfaces in a one-to-one manner.
[0012] Furthermore, guide parts are respectively provided on both sides of the bottom of the slider.
[0013] Furthermore, there are two sliders, and sliding grooves are provided at both ends of the core, and the two sliders are arranged in a one-to-one correspondence with the two sliding grooves; when the mold is closed, the two molding parts move away from each other, and the maximum distance between the two molding parts is not greater than 2.2 mm;
[0014] When the mold is opened, the two molding parts collide with each other or have a gap, and the width of the gap is no more than 0.2 mm.
[0015] The utility model also provides an injection mold, comprising a front mold and a rear mold that cooperate with each other, wherein the above-mentioned core mold group is arranged between the front mold and the rear mold, and the number of the core mold group is not less than one.
[0016] The beneficial effects of the utility model are as follows: when closing the mold, the utility model controls the movement of the slider by a shovel machine to realize that the forming part protrudes out of the core, and when opening the mold, the slider is controlled by a ball screw to realize that the forming part is retracted into the core, so that the forming part can be extended when needed and retracted when not needed, so as to ensure that it does not interfere with the demoulding of the product and the space requirement is reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of Example 1.
[0018] Figure 2 This is a schematic diagram of the decomposition of Example 1.
[0019] Figure 3 This is a schematic diagram of Example 2.
[0020] Figure markings: 1—shovel, 2—core, 3—slider, 4—return member, 5—front mold, 6—rear mold, 11—second inclined surface, 21—sliding groove, 31—control groove, 32—forming part, 33—first inclined surface, 34—guide part, 61—sliding groove, 62—guide groove. DETAILED DESCRIPTION
[0021] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention. The present invention is described in detail below in conjunction with the drawings.
[0022] Example 1
[0023] like Figure 1 and Figure 2As shown, this embodiment provides a core mold assembly for preventing products from being inverted and stretched, including a shovel 1, a core 2, a slider 3 and a return part 4. The shovel 1 is arranged on the front mold 5 outside, and the core 2, the slider 3 and the return part 4 are all arranged on the rear mold 6 outside, and the front mold 5 and the rear mold 6 cooperate with each other; the core 2 is provided with a sliding groove 21, and the slider 3 has a control groove 31 and a molding part 32. The control groove 31 is used to accommodate the shovel 1, and the molding part 32 is slidably arranged in the sliding groove 21.
[0024] This embodiment is applied to a mold comprising a front mold 5 and a rear mold 6. During mold closing, the front mold 5 and rear mold 6 approach each other until they are closed. Driven by the front mold 5, the shovel 1 is inserted into the control groove 31, driving the slider 3 to slide, thereby controlling the molding portion 32 to protrude out of the sliding groove 21 and to form an undercut of the molded product. During this process, the return member 4 changes state due to the movement of the slider 3.
[0025] After the mold is closed, the product is injection molded, and the product has an undercut due to the molding portion 32;
[0026] After the injection molding is completed, the mold needs to be opened: when opening the mold, the shovel 1 leaves the control groove 31 driven by the front mold 5, and the return member 4 forces the slider 3 to slide because it needs to restore its original state autonomously, so as to control the molding part 32 to be completely retracted into the core 2.
[0027] The utility model has a simple structure and controls the extension and retraction of the forming portion 32 by opening and closing the mold, thereby ensuring that the forming portion 32 does not interfere with the product when the product is ejected, thereby ensuring the safety of the product; since the movement of the forming portion 32 is mainly controlled by opening and closing the mold, it requires less space and is easy to promote and use.
[0028] In this embodiment, the forming portion 32 is provided at the top of one end of the slider 3 , and the return member 4 is located at the other end of the slider 3 . The return member 4 abuts against / is connected to the other end of the slider 3 .
[0029] In actual use, the return member 4 is a ball screw, or alternatively, a commonly used elastic return structure such as a spring. During mold closing, the slider 3 squeezes the ball screw, forcing the ball of the ball screw to retract, thereby compressing the spring within the ball screw. Therefore, after mold opening, since the slider 3 is no longer subject to the force of the shovel 1, the spring within the ball screw recovers its deformation and drives the slider 3 back into position, thus cleverly achieving control.
[0030] In this embodiment, first inclined surfaces 33 are respectively provided on both sides of the control groove 31, and the bottoms of the two first inclined surfaces 33 are close to each other and the tops are far away from each other; second inclined surfaces 11 are respectively provided on both sides of the bottom of the shovel 1, and the two first inclined surfaces 33 are in one-to-one contact with the two second inclined surfaces 11.
[0031] Specifically, the cross-section of the control slot 31 is an inverted trapezoid, and the bottom of the shovel 1 is also an inverted trapezoid. This inverted trapezoidal structure effectively allows the shovel 1 to be lowered and inserted into the control slot 31. As the shovel 1 continues to descend, it forces the slide 3 to retreat, allowing the molding portion 32 to protrude beyond the core 2. This cleverly converts the lifting motion of the shovel 1 into the translational motion of the slide 3.
[0032] In this embodiment, guide portions 34 are provided on both sides of the bottom of the slider 3 to achieve a limiting effect, ensure that the slider 3 slides along a straight line on the rear mold 6, and ensure that the slider 3 will not separate from the rear mold 6.
[0033] In this embodiment, there are two sliders 3, and a sliding groove 21 is provided at each end of the core 2. The two sliders 3 are arranged in a one-to-one correspondence with the two sliding grooves 21. When the mold is closed, the two molding parts 32 move away from each other, and the maximum distance between the two molding parts 32 is no more than 2.2 mm.
[0034] When the mold is opened, the two molding parts 32 contact each other or have a gap therebetween, and the width of the gap is no more than 0.2 mm.
[0035] By setting the above structure, the stroke of the forming portion 32 is made as small as possible, thereby ensuring the accuracy of the undercut.
[0036] Example 2
[0037] like Figure 3 As shown, this embodiment provides an injection mold, including a front mold 5 and a rear mold 6 that cooperate with each other, and the core module described in Example 1 is arranged between the front mold 5 and the rear mold 6. The number of core modules is not less than one, such as the number of core modules in this embodiment is four.
[0038] The rear mold 6 is provided with a sliding groove 61 for the slider 3 to slide, and guide grooves 62 are provided on both sides of the sliding groove 61 for the guide portion 34 to slide.
[0039] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention is disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of the above-disclosed technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technology of the present invention, which do not depart from the content of the technical solution of the present invention, are within the scope of the technical solution of the present invention.
Claims
1. A core mold assembly for preventing product damage caused by undercutting, characterized by: The mold comprises a shovel, a core, a slider, and a return member, wherein the shovel is arranged in an external front mold, and the core, the slider, and the return member are all arranged in an external rear mold, and the front mold and the rear mold cooperate with each other; the core is provided with a sliding groove, and the slider has a control groove and a forming part, the control groove is used to accommodate the shovel, and the forming part is slidably arranged in the sliding groove; When closing the mold, the shovel is inserted into the control groove to drive the slider to slide, so as to control the molding part to protrude out of the sliding groove and be used for the undercut of the molded product; when opening the mold, the shovel leaves the control groove, and the return part forces the slider to slide, so as to control the molding part to be completely retracted into the core.
2. The core mold assembly for preventing product damage due to undercutting according to claim 1, characterized in that: The forming portion is arranged on the top of one end of the slider, and the return member is located at the other end of the slider, and the return member contacts / is connected to the other end of the slider.
3. The core mold assembly for preventing product damage due to undercutting according to claim 1 or 2, characterized in that: The return member is a ball screw.
4. The core mold assembly for preventing product damage due to undercutting according to claim 1, characterized in that: A first inclined surface is provided on both sides of the control groove, the bottoms of the two first inclined surfaces are close to each other and the tops are far away from each other; a second inclined surface is provided on both sides of the bottom of the shovel, and the two first inclined surfaces are in conflict with the two second inclined surfaces in a one-to-one manner.
5. The core mold assembly for preventing product damage due to undercutting according to claim 1, characterized in that: Guide parts are respectively provided on both sides of the bottom of the sliding block.
6. The core mold assembly for preventing product damage due to undercutting according to claim 1, characterized in that: There are two sliders, and sliding grooves are provided at both ends of the core. The two sliders are arranged in a one-to-one correspondence with the two sliding grooves. When the mold is closed, the two molding parts move away from each other, and the maximum distance between the two molding parts is not greater than 2.2 mm. When the mold is opened, the two molding parts collide with each other or have a gap, and the width of the gap is no more than 0.2 mm.
7. An injection mold, comprising a front mold and a rear mold that cooperate with each other, characterized in that: A core module according to any one of claims 1 to 6 is provided between the front mold and the rear mold, and the number of the core modules is not less than one.