Injection mold for forming product with pipeline type deep cavity
By designing the inverted release mechanism and ejecting mechanism in the injection mold, the inserts of pipe-type deep cavity products are removed in step by step, and the problems of high product damage and poor yield during the demoulding process in the prior art are solved, and the problem of high product damage and poor yield rate is achieved. High-quality mold output and reduced cost of products.
Patent Information
- Application Number
- CN202421049314.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-15
AI Technical Summary
During the demoulding process, existing injection molds are prone to cause appearance defects such as deformation, protrusion and whitening of pipe-type deep cavity products, resulting in high defect rate.
An injection mold with an inverted release mechanism is designed. By disassemblying the front mold insert and the rear mold insert and using the slider to drive the assembly to slide in a vertical direction, the mold is released step by step to avoid the product in the ejection process. The damage in the process is combined with the ejection mechanism to achieve normal mold output of the product.
It effectively avoids appearance defects such as glue deformation, protrusion and whitening when ejected, improves product quality and aesthetics, and does not need to add additional driving devices, achieving cost reduction and efficiency improvement.
Smart Images
Figure CN222309677U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold for product molding with a pipeline-shaped deep cavity. Background Art
[0002] An injection mold is a mold used to produce plastic products. It is usually composed of a front mold part and a back mold part, wherein a cavity is formed between the front mold and the back mold. The molten plastic is injected into the cavity through an injection molding machine, and after cooling and solidification, the desired plastic product is formed.
[0003] For products with pipe-shaped cavities, when designing the mold, a convex core insert is generally set on the front mold core or the rear mold core, and the product can be directly ejected from the convex core insert after the mold is opened. However, when the pipe-shaped cavity on the product is deep and there is an undercut, the prior art adopts a direct ejection method. During the process of pulling the convex core insert out of the product's deep pipe-shaped cavity, it is easy to cause appearance defects such as product glue deformation, bulges, and whitening, and the product defect rate is high. Therefore, it is necessary to improve the prior art to overcome the defects in the prior art. Utility Model Content
[0004] The problem to be solved by the utility model is to provide an injection mold for molding products with a pipeline-shaped deep cavity, so as to overcome the defect that the existing injection mold is easily damaged during the demoulding process of the product with the pipeline-shaped deep cavity, resulting in a high defective product rate.
[0005] The utility model adopts a technical solution to solve the technical problem: an injection mold for molding a product with a pipeline-type deep cavity, comprising: a front mold, a rear mold and an ejection mechanism, wherein a front mold core is fixed at the bottom of the front mold, a rear mold core is fixed at the top of the rear mold, and the front mold core and the rear mold core are arranged opposite to each other up and down; a front mold insert is arranged on the front mold core, a rear mold insert is arranged on the rear mold core, and an undercut demoulding mechanism is installed on the rear mold, the undercut demoulding mechanism comprises a slider, a slider top plate and a slider driving assembly, the slider is slidably mounted on the slider top plate, and in a mold closing state, the slider can cooperate with the front mold insert and the rear mold insert to form a pipeline molding cavity for molding a pipeline portion of a product; the slider top plate is connected to the ejection mechanism, and the ejection mechanism is used to drive the slider top plate in an open mold state to drive the slider to eject the product upward from the rear mold core, and drive the slider to slide along a direction perpendicular to the mold opening and closing direction under the action of the slider driving assembly.
[0006] As a further improvement of the utility model, the undercut demolding mechanism is provided with two symmetrically distributed ones. In the mold closing state, the front mold insert and the rear mold insert are spliced with each other in the vertical direction and are located between the two sliders, and the pipeline forming cavity is formed by the gaps between the two sliders and the front mold insert and the rear mold insert.
[0007] As a further improvement of the present invention, the slider driving assembly includes a demolding inclined guide block fixedly connected to the rear mold and two pushing members installed on the slider, the two pushing members are distributed on both sides of the demolding inclined guide block, the demolding inclined guide block is provided with an inclined section, and the pushing members are slidably matched with the inclined section to drive the slider to slide in a direction perpendicular to the opening and closing mold direction.
[0008] As a further improvement of the utility model, the demoulding inclined guide block is also provided with a vertical section, the lower end of the inclined section is connected to the upper end of the vertical section, the upper end of the inclined section is inclined upward in a direction away from the pipe forming cavity, and the distance between the pushing member located on the outside of the demoulding inclined guide block and the lower end of the inclined section is the ejection holding distance. When the ejection mechanism drives the slider top plate to drive the slider to move upward for the ejection holding distance, the slider does not slide.
[0009] As a further improvement of the utility model, the pushing members are all rollers, and the roller shafts are arranged on the sliders.
[0010] As a further improvement of the utility model, the bottom of the front mold is provided with a clearance hole for accommodating the demoulding inclined guide block.
[0011] As a further improvement of the utility model, two slider pressure plates and a slider limiting column are fixed on the slider top plate, the two slider pressure plates are respectively pressed on both sides of the slider, and the slider limiting column is used to stop the slider.
[0012] As a further improvement of the utility model, a demoulding pressure rod and a demoulding auxiliary spring are installed on the front mold core, and the demoulding pressure rod is used to be pressed on the top of the sliding block under the elastic force of the demoulding auxiliary spring when the mold is opened.
[0013] As a further improvement of the utility model, a first positioning portion is provided at the bottom of the front mold insert, and a second positioning portion is provided at the top of the rear mold insert. One of the first positioning portion and the second positioning portion is set as a groove, and the other is set as a boss. When the mold is closed, the first positioning portion and the second positioning portion are plugged into each other.
[0014] As a further improvement of the utility model, the ejection mechanism includes an ejector plate and a plurality of ejectors arranged below the rear mold, and the plurality of ejectors are fixedly connected between the ejector plate and the slider ejector plate.
[0015] The beneficial effects of the utility model are as follows: the utility model provides an injection mold for molding a product with a pipeline-type deep cavity, by splitting the insert of the pipeline part of the molding product into a front mold insert and a rear mold insert, when the front mold and the rear mold are relatively opened, the front mold insert is firstly pulled out from the upper half of the pipeline part of the product, and then as the ejection mechanism ejects upward, the lower half of the pipeline part of the product is ejected from the rear mold insert, this step-by-step demolding method of the pipeline-type deep cavity can effectively avoid the appearance defects such as glue position deformation, bulge, and whitening when the product is ejected, thereby improving the product quality and product aesthetics; at the same time, in the process of ejecting the product, the ejection mechanism drives the slider to slide in a direction perpendicular to the opening and closing mold direction through the slider driving assembly to eject from the undercut structure of the pipeline part of the product, and there is no need to separately add a driving device such as a cylinder, so that the product can be normally demolded, thereby reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a three-dimensional diagram of the injection mold for molding products with a pipeline-shaped deep cavity of the utility model;
[0017] Figure 2 It is a cross-sectional view of an injection mold for molding a product with a pipeline-shaped deep cavity according to the utility model;
[0018] Figure 3 For this utility model Figure 2 A magnified view of middle;
[0019] Figure 4 It is an exploded view of the front mold core, the rear mold core and the undercut demoulding mechanism in the utility model;
[0020] Figure 5 It is a stereoscopic view of the slider of the undercut demoulding mechanism in the utility model when it is opened outwards.
[0021] Combined with the attached drawings, the following description is given:
[0022] 1. Front mold; 101. Avoidance hole; 2. Back mold; 3. Front mold core; 301. Front mold insert; 3011. First positioning part; 4. Back mold core; 401. Back mold insert; 4011. Second positioning part; 5. Slider; 6. Slider top plate; 7. Product; 8. Demolding inclined guide block; 801. Inclined section; 802. Vertical section; 9. Roller; 10. Slider pressure plate; 11. Slider limiting column; 12. Demolding pressure rod; 13. Demolding auxiliary spring; 14. Ejector plate; 15. Ejector. DETAILED DESCRIPTION
[0023] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
[0024] See also Figures 1 to 5 The utility model provides an injection mold for molding a product with a pipeline-shaped deep cavity, comprising: a front mold 1, a rear mold 2 and an ejection mechanism, a front mold core 3 is fixed to the bottom of the front mold 1, a rear mold core 4 is fixed to the top of the rear mold 2, the front mold core 3 and the rear mold core 4 are arranged opposite to each other up and down, and a cavity for molding a product 7 is formed between the two.
[0025] The product 7 to be molded by the injection mold of the utility model has a pipeline portion distributed along the vertical direction, and an undercut structure exists on the outer periphery of the pipeline portion.
[0026] Furthermore, the injection mold for molding a product with a deep pipeline cavity also includes an undercut demoulding mechanism, which is installed on the rear mold 2. The undercut demoulding mechanism includes a slider 5, a slider top plate 6 and a slider driving assembly, and the slider 5 is slidably installed on the slider top plate 6. A front mold insert 301 is provided on the front mold core 3, and a rear mold insert 401 is provided on the rear mold core 4. In the mold closing state, the front mold insert 301 and the rear mold insert 401 are spliced with each other in the vertical direction, and the slider 5 cooperates with the spliced front mold insert 301 and the rear mold insert 401 to form a pipeline molding cavity for molding the pipeline part of the product 7. The slider top plate 6 is connected to the ejection mechanism, which is used to drive the slider top plate 6 to drive the slider 5 to eject the product 7 upward from the rear mold core 4 in the mold opening state, and drive the slider 5 to slide in a direction perpendicular to the mold opening and closing direction under the action of the slider driving assembly to eject the undercut structure on the periphery of the pipeline part of the product 7.
[0027] It can be seen that the utility model separates the inserts of the pipeline part of the molding product 7 into the front mold insert 301 and the rear mold insert 401. When the front mold 1 and the rear mold 2 are relatively opened, the front mold insert 301 is firstly pulled out from the upper half of the pipeline part of the product 7, and then as the ejection mechanism ejects upward, the lower half of the pipeline part of the product 7 is ejected from the rear mold insert 401. This step-by-step demolding method of the pipeline-type deep cavity can effectively avoid the appearance defects such as glue deformation, bulge, and whitening when the product is ejected, thereby improving the product quality and product aesthetics. At the same time, in the process of ejecting the product 7, the ejection mechanism drives the slider 5 to slide in a direction perpendicular to the opening and closing direction through the slider driving assembly to eject from the undercut structure of the pipeline part of the product 7. There is no need to add a separate driving device such as a cylinder, so that the product 7 can be normally demolded, thereby reducing costs and increasing efficiency.
[0028] like Figure 3As shown, a first positioning portion 3011 is provided at the bottom of the front mold insert 301, and a second positioning portion 4011 is provided at the top of the rear mold insert 401. In this embodiment, the first positioning portion 3011 is set as a groove, and the second positioning portion 4011 is set as a boss. When the mold is closed, the first positioning portion 3011 and the second positioning portion 4011 are plugged together to ensure the accuracy of splicing the front mold insert 301 and the rear mold insert 401.
[0029] In this embodiment, two undercut demoulding mechanisms are provided which are symmetrically distributed. In the mold closing state, the front mold insert 301 and the rear mold insert 401 are vertically connected to each other and are located between the two sliders 5. The pipeline forming cavity is formed by the gaps between the two sliders 5 and the front mold insert 301 and the rear mold insert 401.
[0030] See also Figure 2 and Figure 3 The slider driving assembly includes a demoulding oblique guide block 8 and two pushers. The demoulding oblique guide block 8 is inserted in the slider 5, and the lower end of the demoulding oblique guide block 8 is fixedly connected to the rear mold 2; the two pushers are installed on the slider 5 and distributed on both sides of the demoulding oblique guide block 8. The demoulding oblique guide block 8 is provided with an inclined section 801. When the ejection mechanism drives the slider top plate 6 to drive the slider 5 to eject upward, the two pushers are slidably matched with the inclined section 801 to drive the slider 5 to slide outward in a direction perpendicular to the mold opening and closing direction.
[0031] It is worth mentioning that the demoulding inclined guide block 8 is also provided with a vertical section 802, and the lower end of the inclined section 801 is connected to the upper end of the vertical section 802. The upper end of the inclined section 801 is inclined upward in a direction away from the pipe forming cavity, so that the inclined sections 801 of the two demoulding inclined guide blocks 8 are distributed in an inverted figure eight shape. There is a certain distance between a pusher located on the outside of the demoulding inclined guide block 8 (i.e., the pusher located on the side of the demoulding inclined guide block 8 facing away from the pipe forming cavity) and the lower end of the inclined section 801, and the distance is the ejection holding distance; when the ejection mechanism drives the slider top plate 6 to drive the slider 5 to move upward for the ejection holding distance, during this movement, the outer pusher does not contact the inclined section 801 of the demoulding inclined guide block 8, and thus does not drive the slider 5 to slide. The purpose of this structural setting is that at the beginning of the ejection mechanism's upward ejection, i.e., the ejection holding distance, the slider 5 can be used to drive the product 7 to eject the rear mold core 4 upward, so as to eject the lower half of the pipe portion of the product 7 from the rear mold insert 401.
[0032] The bottom of the front mold 1 is provided with a clearance hole 101 , and the upper end of the demoulding inclined guide block 8 is accommodated in the clearance hole 101 .
[0033] In the present invention, the pushers are rollers 9, the rollers 9 are axially arranged on the slider 5, and the rollers 9 are in rolling contact with the demoulding inclined guide block 8, which can reduce wear and improve stability.
[0034] See also Figure 5 Two slider pressing plates 10 and a slider limiting column 11 are fixed on the slider top plate 6. Bosses are provided on both sides of the slider 5. The two slider pressing plates 10 are respectively pressed on the bosses on both sides of the slider 5 to limit the slider 5 to slide only in the direction perpendicular to the mold opening and closing direction on the slider top plate 6. The slider limiting column 11 is arranged at one end of the slider top plate 6 away from the pipe forming cavity. The slider limiting column 11 is used to stop the slider 5 to limit its movement stroke.
[0035] See also Figure 3 and Figure 4 The front mold core 3 is provided with a demoulding rod 12 that can move up and down. The top of the demoulding rod 12 is elastically supported by a demoulding auxiliary spring 13. The demoulding rod 12 is used to press the top of the slider 5 under the elastic force of the demoulding auxiliary spring 13 when the mold is opened. When the rear mold 2 is opened relative to the front mold 1, the demoulding rod 12 is used to press the slider 5 to ensure that the slider 5 and the product 7 can move with the rear mold 2.
[0036] The ejection mechanism includes an ejector plate 14 arranged below the rear mold 2 and a plurality of ejector pins 15 , and the plurality of ejector pins 15 are fixedly connected between the ejector plate 14 and the slider ejector plate 6 .
[0037] When the product 7 is injection molded and cooled, the rear mold 2 is first opened relative to the front mold 1, and the undercut demoulding mechanism and the product 7 follow the rear mold 2 to move until they reach the fully opened position; at this time, the front mold insert 301 has been pulled out from the upper half of the pipe part of the product 7; then, the ejection mechanism drives the slider top plate 6 to eject upward, driving the slider 5 and the roller 9 thereon to move upward. Within the ejection holding distance, the roller 9 does not contact the inclined section 801 of the demoulding inclined guide block 8, thereby not driving the slider 5 to slide. In this process, the slider 5 can be relied on to drive the product 7 to eject the rear mold core 4 upward, so as to eject the lower half of the pipe part of the product 7 from the rear mold insert 401; in the subsequent ejection process, the roller 9 contacts the inclined section 801, and the roller 9 and the inclined section 801 roll and cooperate to drive the slider 5 to slide outward in a direction perpendicular to the opening and closing direction of the mold, so that the slider 5 is ejected from the undercut structure of the pipe part of the product 7; finally, the product 7 is taken out, and the mold is closed again for the next injection molding.
[0038] It can be seen that the injection mold for molding products with a pipeline-type deep cavity of the utility model is formed by splitting the insert of the pipeline part used to mold the product 7 into a front mold insert 301 and a rear mold insert 401. When the front mold 1 and the rear mold 2 are relatively opened, the front mold insert 301 is first pulled out from the upper half of the pipeline part of the product 7, and then as the ejection mechanism ejects upward, the lower half of the pipeline part of the product 7 is ejected from the rear mold insert 401. This step-by-step demolding method of the pipeline-type deep cavity can effectively avoid appearance defects such as glue deformation, bulges, and whitening when the product is ejected, thereby improving product quality and product aesthetics; at the same time, during the process of ejecting the product 7, the ejection mechanism drives the slider 5 to slide in a direction perpendicular to the opening and closing direction of the mold through the slider drive assembly to eject from the undercut structure of the pipeline part of the product 7. There is no need to add a separate driving device such as a cylinder, so that the product 7 can be normally demolded, thereby reducing costs and increasing efficiency.
[0039] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.
Claims
1. An injection mold for molding a product with a pipeline-shaped deep cavity, comprising a front mold (1), a rear mold (2) and an ejection mechanism, wherein a front mold core (3) is fixed to the bottom of the front mold (1), a rear mold core (4) is fixed to the top of the rear mold (2), and the front mold core (3) and the rear mold core (4) are arranged opposite to each other in the upper and lower directions; characterized in that: The front mold core (3) is provided with a front mold insert (301), the rear mold core (4) is provided with a rear mold insert (401), and the rear mold (2) is provided with an undercut demoulding mechanism, the undercut demoulding mechanism comprising a slider (5), a slider top plate (6) and a slider driving assembly, the slider (5) is slidably mounted on the slider top plate (6), and in the mold closing state, the slider (5) can cooperate with the front mold insert (301) and the rear mold insert (401) to form a pipeline forming cavity for forming the pipeline part of the product (7); the slider top plate (6) is connected to the ejection mechanism, and the ejection mechanism is used to drive the slider top plate (6) in the mold opening state to drive the slider (5) to eject the product (7) upward from the rear mold core (4), and drive the slider (5) to slide in a direction perpendicular to the mold opening and closing direction under the action of the slider driving assembly.
2. The injection mold for product molding with a pipeline-shaped deep cavity according to claim 1, characterized in that: The undercut demoulding mechanism is provided with two symmetrically distributed ones. In the mold closing state, the front mold insert (301) and the rear mold insert (401) are spliced with each other in the vertical direction and are located between the two sliders (5). The pipeline forming cavity is formed by the gaps between the two sliders (5) and the front mold insert (301) and the rear mold insert (401).
3. The injection mold for molding a product with a pipeline-shaped deep cavity according to claim 1, characterized in that: The slider driving assembly comprises an inclined demoulding guide block (8) fixedly connected to the rear mold (2) and two pushing members installed on the slider (5), the two pushing members are distributed on both sides of the inclined demoulding guide block (8), the inclined demoulding guide block (8) is provided with an inclined section (801), and the pushing members are slidably matched with the inclined section (801) to drive the slider (5) to slide along a direction perpendicular to the mold opening and closing direction.
4. The injection mold for molding a product with a pipeline-shaped deep cavity according to claim 3, characterized in that: The demoulding inclined guide block (8) is also provided with a vertical section (802), the lower end of the inclined section (801) is connected to the upper end of the vertical section (802), the upper end of the inclined section (801) is inclined upward in a direction away from the pipe forming cavity, and the distance between a pushing member located on the outer side of the demoulding inclined guide block (8) and the lower end of the inclined section (801) is an ejection holding distance. When the ejection mechanism drives the slider top plate (6) to drive the slider (5) to move upward for a distance equal to the ejection holding distance, the slider (5) does not slide.
5. The injection mold for molding a product with a pipeline-shaped deep cavity according to claim 3, characterized in that: The pushing members are all rollers (9), and the shafts of the rollers (9) are arranged on the sliders (5).
6. The injection mold for molding a product with a pipeline-shaped deep cavity according to claim 3, characterized in that: The bottom of the front mold (1) is provided with a clearance hole (101) for accommodating the demoulding inclined guide block (8).
7. The injection mold for molding a product with a pipeline-shaped deep cavity according to claim 1, characterized in that: Two slider pressure plates (10) and a slider limiting column (11) are fixed on the slider top plate (6); the two slider pressure plates (10) are respectively pressed on two sides of the slider (5); and the slider limiting column (11) is used to stop the slider (5).
8. The injection mold for molding a product with a pipeline-shaped deep cavity according to claim 1, characterized in that: The front mold core (3) is provided with a demoulding pressure rod (12) and a demoulding auxiliary spring (13), and the demoulding pressure rod (12) is used to be pressed against the top of the slider (5) under the elastic force of the demoulding auxiliary spring (13) when the mold is opened.
9. The product molding injection mold with a pipeline-shaped deep cavity according to claim 1, characterized in that: The bottom of the front mold insert (301) is provided with a first positioning portion (3011), and the top of the rear mold insert (401) is provided with a second positioning portion (4011). One of the first positioning portion (3011) and the second positioning portion (4011) is set as a groove, and the other is set as a boss. When the mold is closed, the first positioning portion (3011) and the second positioning portion (4011) are plugged and matched.
10. The product molding injection mold with a pipeline-shaped deep cavity according to claim 1, characterized in that: The ejection mechanism comprises an ejector plate (14) arranged below the rear mold (2) and a plurality of ejector pins (15), wherein the plurality of ejector pins (15) are fixedly connected between the ejector plate (14) and the slider ejector plate (6).