Insert structure for injection mold and injection mold structure
By employing an insert structure in the injection mold and utilizing the coaxial arrangement of through holes and vent holes, an efficient venting path is formed, solving the venting difficulty problem of deep cavity products and improving product quality and mold life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2026-03-31
AI Technical Summary
In the current technology, the venting effect of deep cavity products is limited during the injection molding process of plastic molds, resulting in quality problems such as product bulging, air holes and scorching.
The device employs an insert structure, including coaxially arranged through holes and vent holes, which, together with the vent steel and the second insert, form an efficient venting passage. The design of the insert structure optimizes the number, size, and distribution of the vent holes, ensuring smooth gas discharge.
It effectively solved the problem of trapped air in the product, improved the product yield, reduced mold wear, extended the mold life, and improved product quality.
Smart Images
Figure CN224060363U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to injection mold technical field especially relates to a kind of insert structure and injection mold structure for injection mold. BACKGROUND
[0002] Gas trapping is a common problem in the injection molding process of plastic mold, which can cause surface defects, internal porosity, burning and other quality problems.
[0003] The common gas trapping solution for plastic mold is to open an exhaust groove at the parting surface, core, cavity and other parts prone to gas trapping, or to set an insert at the core, cavity and other parts, and use the gap between the insert and the mold body for exhaust. However, the above method sometimes has very limited exhaust effect for deep cavity products (especially thin-walled deep cavity products), and the gas cannot be effectively discharged, causing product bulging, porosity, burning and other problems. SUMMARY
[0004] The utility model embodiment provides an insert structure and injection mold structure for injection mold to solve the problems in the prior art.
[0005] The utility model embodiment adopts the following technical solutions:
[0006] An insert structure for injection mold is used in injection mold, comprising:
[0007] A first insert has a through hole arranged coaxially, and at least one group of exhaust holes distributed on the side wall of the first insert, the exhaust holes penetrating through the side wall of the first insert and communicating with the through hole;
[0008] A second insert is coaxially installed in the through hole and forms a gap between the side wall of the through hole, the gap communicating with the exhaust hole;
[0009] An exhaust steel is embedded on the side wall of the first insert and located at the gas inlet end of the exhaust hole.
[0010] Preferably, a sunken groove is formed on the end face of one end of the first insert; and a limiting block is formed at one end of the second insert, and the limiting block abuts against the sunken groove.
[0011] Preferably, a first plane is formed on the surface of the second insert, and the first plane forms an exhaust gap with the side wall of the through hole.
[0012] Preferably, a second plane is formed on the limiting block, and the first plane and the second plane are located on the same plane and connected as a whole.
[0013] Preferably, an exhaust gap is formed between the limiting block and the side wall of the sunken groove, and the exhaust gap respectively communicates with the through hole and the exhaust channel of the injection mold.
[0014] Preferably, the exhaust holes comprise at least one set of radial exhaust holes distributed on the side wall of the first insert in a radial direction, the radial exhaust holes being connected to the exhaust gap through the gap.
[0015] Preferably, the exhaust holes comprise at least one axial exhaust hole arranged in parallel to the axial direction of the first insert and located in the side wall of the first insert, the exhaust end of the axial exhaust hole being connected to the through hole through the exhaust gap.
[0016] An injection mold structure comprises a fixed mold and a movable mold, and further comprises the insert structure; the insert structure is installed on the fixed mold.
[0017] Preferably, the fixed mold comprises:
[0018] a fixed mold body;
[0019] a fixed mold core detachably installed on the fixed mold body, having a through hole and a limiting wall located at the end of the through hole, and the first insert being coaxially installed in the through hole;
[0020] a limiting member installed on the fixed mold core so that the limiting part on the first insert is axially limited between the limiting wall and the limiting member.
[0021] Preferably, the limiting block is axially limited between the limiting member and the bottom surface of the sunken groove on the end surface of the first insert.
[0022] Preferably, the movable mold is provided with a movable mold core; in the closed state of the fixed mold and the movable mold, the insert structure is at least partially inserted into the cavity of the movable mold core, and a forming cavity of an injection product is formed between the insert structure and the cavity wall surface.
[0023] The above at least one technical scheme adopted by the embodiment of the utility model can achieve the following beneficial effects:
[0024] The through hole coaxially arranged with the first insert provides a precise positioning basis for the installation of the second insert, ensures the coaxiality of the whole insert structure, and is beneficial to the smoothness of subsequent exhaust. The exhaust holes distributed on the side wall thereof are channels for gas exhaust. The number, size and distribution position of the exhaust holes can be flexibly designed according to the needs of different injection molding products and gas trapping prediction conditions. For example, for large deep cavity products, the number and diameter of the exhaust holes can be increased to improve the exhaust efficiency. During the injection molding process, when the molten plastic is injected into the mold cavity, due to the special structure of the deep cavity, air is difficult to be quickly exhausted, and air trapping phenomenon is easily formed. At this time, the gas in the air trapping area first contacts the exhaust steel, the exhaust steel absorbs and guides the gas into the exhaust hole by virtue of the pore structure thereof; the gas enters the through hole of the first insert through the exhaust hole, and then passes through the gap between the through hole side wall of the second insert and the through hole, and is finally exhausted. In this process, the whole insert structure forms an efficient exhaust passage, and the air trapping is exhausted in time, avoiding the influence of air trapping on the product quality. BRIEF DESCRIPTION OF DRAWINGS
[0025] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, and the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application.
[0026] Figure 1 It is a perspective view of the insert structure of the present application.
[0027] Figure 2 It is a perspective view of the first insert of the present application.
[0028] Figure 3 It is a perspective view of the second insert of the present application.
[0029] Figure 4 It is an exploded view (cross section) of the first insert and the second insert of the present application.
[0030] Figure 5 It is an assembly schematic view (cross section) of the first insert and the second insert of the present application.
[0031] Figure 6 It is a perspective view of the insert structure and the movable mold core of the present application.
[0032] Figure 7 It is an assembly schematic view (cross section) of the insert structure and the movable mold core of the present application.
[0033] Figure 8 It is a partial enlarged view of A of the present application. Figure 7
[0034] Figure 9 It is an assembly schematic view of the mold structure of the present application.
[0035] Figure 10 For the utility model Figure 9 of the partial enlarged view.
[0036] Reference signs
[0037] 1, the first insert; 11, the through hole; 12, the exhaust hole; 121, the radial exhaust hole; 122, the axial exhaust hole; 13, the exhaust gap; 14, the sunken groove; 15, the limiting part;
[0038] 2, the second insert; 21, the limiting block; 22, the first plane; 23, the second plane;
[0039] 3, exhaust steel;
[0040] 4, the fixed mold; 41, the fixed mold body; 42, the fixed mold core; 421, the through hole; 422, the limiting wall; 43, the limiting piece;
[0041] 5, the movable mold; 51, the movable mold core;
[0042] 6, the forming cavity. Specific embodiments
[0043] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific embodiments, structures, features and effects according to the utility model are described in detail as follows in combination with the drawings and preferred embodiments.
[0044] The technical solutions provided by the embodiments of the utility model are described in detail in combination with the drawings as follows.
[0045] Referring to Figure 1 to Figure 5 The utility model embodiment provides an insert structure for injection mold, for injection mold, mainly including first insert 1, second insert 2 and exhaust steel 3.
[0046] The first insert 1 has the through hole 11 arranged coaxially, and at least one group of exhaust holes 12 distributed on the side wall of the first insert 1, the exhaust hole 12 penetrates the side wall of the first insert 1 and is communicated with the through hole 11;Second insert 2 is coaxially installed in the through hole 11, and a gap is formed between the side wall of the through hole 11, and the gap is communicated with the exhaust hole 12;Exhaust steel 3 is embedded on the side wall of the first insert 1, and is located at the air inlet end of the exhaust hole 12 (with reference to the exhaust direction).
[0047] The through hole 11 coaxially arranged on the first insert 1 provides a precise positioning basis for the installation of the second insert 2, ensures the coaxiality of the entire insert structure, and is conducive to the smoothness of subsequent exhaust. The exhaust holes 12 distributed on the side wall thereof are channels for gas exhaust. The number, size and distribution position of the exhaust holes 12 can be flexibly designed according to the needs of different injection molding products and gas prediction conditions. For example, for large deep cavity products, the number and diameter of the exhaust holes 12 may need to be increased to improve the exhaust efficiency.
[0048] The second insert 2 is installed in the through hole 11 of the first insert 1, and a gap is formed between the second insert 2 and the side wall of the through hole 11. This gap connects the exhaust holes 12 with the exhaust channel of the injection mold (which can be direct connection or indirect connection), so that the gas entering from the exhaust holes 12 can smoothly pass through the gap and enter the next exhaust link. In some actual applications, the second insert 2 is generally a pin inserted into the through hole 11.
[0049] The exhaust steel 3 is embedded on the side wall of the first insert 1 and located at the gas inlet end of the exhaust hole 12. The exhaust steel 3 can allow gas to pass through while blocking the entry of injection molding material, ensuring the effectiveness of exhaust and the normal progress of the injection molding process. In addition, the arrangement of the exhaust steel 3 can effectively ensure the strength of the insert structure itself.
[0050] During the injection molding process, when the molten plastic is injected into the mold cavity, due to the special structure of the deep cavity, air is difficult to quickly exhaust, and air trapping phenomenon is easily formed. At this time, the gas in the air trapping area first contacts the exhaust steel 3, which absorbs and guides the gas into the exhaust hole 12 by virtue of its micro-porous structure; the gas enters the exhaust channel of the injection mold after passing through the gap between the second insert 2 and the side wall of the through hole 11, and is finally exhausted; or the gas enters the exhaust channel of the injection mold through the exhaust hole 12 and is finally exhausted. In this process, the entire insert structure forms an efficient exhaust passage, which timely exhausts the air trapping and avoids the influence of air trapping on product quality.
[0051] This insert structure effectively solves the problems of bulging, porosity, burning and the like caused by product air trapping, and improves the yield of products. In addition, due to insufficient exhaust, the traditional exhaust method is prone to cause the internal pressure of the mold to be too high, thereby accelerating the wear of the mold. This new insert structure can effectively reduce the internal pressure of the mold, reduce the wear and damage of the mold, and prolong the service life of the mold.
[0052] In some actual applications, as shown in Figure 1 to Figure 5 , a sunken groove 14 is formed on the end face of one end of the first insert 1; and a limiting block 21 is formed at one end of the second insert 2, and the limiting block 21 abuts against the sunken groove 14 to solve the installation problem between the first insert 1 and the second insert 2.
[0053] In some practical applications, referring to Figure 3 , Figure 4 , the second insert 2 is formed with a first plane 22, which forms an exhaust gap with the side wall of the through hole 11. The exhaust path is further optimized through the exhaust gap, so that the gas generated during injection molding can be more smoothly discharged, thereby improving product quality and avoiding various defects caused by trapped gas.
[0054] Based on the first plane 22, a second plane 23 can also be formed on the limiting block 21, and the first plane 22 and the second plane 23 are located on the same plane and are connected in one piece. In this way, even if the end face of the limiting block 21 abuts against the bottom surface of the sunken groove 14, the smooth exhaust can be ensured (the gas discharged from the through hole will not be blocked by the limiting block).
[0055] In some practical applications, referring to Figure 1 , Figure 5 , the limiting block 21 and the side wall of the sunken groove 14 form an exhaust gap 13, which is respectively communicated with the through hole 11 and the exhaust passage of the injection mold. The existence of the exhaust gap 13 provides a path for the gas to flow from the through hole 11 to the exhaust passage of the injection mold, making the position design of the exhaust passage of the injection mold more flexible.
[0056] In some practical applications, referring to Figure 4 , the exhaust hole 12 includes at least one set of radial exhaust holes 121 distributed radially on the side wall of the first insert 1, which is communicated with the exhaust gap 13 through the gap, providing an exhaust passage for the gas generated during injection molding. Due to the complex shape and structure of the injection molded product, it is difficult to predict the location of trapped gas. The different distribution positions of the radial exhaust holes 121 can flexibly cope with the trapped gas situation in different parts, improve the comprehensiveness and pertinence of exhaust, and make the gas can be discharged from the side wall of the first insert 1 into the through hole 11 in time.
[0057] In other practical applications, the exhaust hole 12 in any of the above embodiments is further optimized and designed, referring to Figure 1 , Figure 2 , Figure 4 , Figure 5 , the exhaust hole 12 includes at least one axial exhaust hole 122 located in the side wall of the first insert 1 and parallel to the axial direction of the first insert 1, and the gas outlet end of the axial exhaust hole 122 is communicated with the through hole 11 through the exhaust gap 13. It is complementary to the radial exhaust hole 121, further perfects the exhaust structure, and enhances the dredging ability of the trapped gas in the specific position (the bottom end of the first insert 1 in this embodiment), and improves the overall exhaust efficiency.
[0058] An injection mold structure, referring toFigure 1 to Figure 10 As shown, the mold structure includes a fixed mold 4 and a movable mold 5, and also includes the insert structure as described above; the insert structure is mounted on the fixed mold 4.
[0059] In some practical applications, referring to Figure 6 - Figure 9 As shown, the fixed mold 4 includes a fixed mold body 41, a fixed mold core 42, and a limiting piece 43.
[0060] The fixed mold core 42 is detachably mounted on the fixed mold body 41; it has a through hole 421 and a limiting wall 422 at the end of the through hole 421, and the first insert 1 is coaxially mounted in the through hole 421; the limiting piece 43 is mounted on the fixed mold core 42, so that the limiting part 15 on the first insert 1 is axially limited between the limiting wall 422 and the limiting piece 43. At the same time, the limiting block 21 is axially limited between the limiting piece 43 and the bottom surface of the sunken groove 14 on the end surface of the first insert 1, so as to achieve complete limiting of the limiting block 21 in the axial direction.
[0061] In some practical applications, referring to Figure 9 、 Figure 10 As shown, the movable mold 5 is provided with a movable mold core 51; in the closed state of the fixed mold 4 and the movable mold 5, the insert structure is at least partially inserted into the cavity of the movable mold core 51, and forms a molding cavity 6 with the cavity wall surface of the movable mold core 51, the insert structure serving as a product molding component and forming the molding cavity 6 with the cavity wall surface of the movable mold core 51; on the other hand, it bears the exhaust function during the injection molding process, and through its own exhaust design, such as exhaust holes 12, exhaust gaps, and exhaust gaps 13, etc., it exhausts gas to avoid the influence of trapped gas on product quality.
[0062] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the scope of the present application, and any equivalent embodiments with equivalent changes are also included. Any modification, equivalent change and modification of the above-mentioned embodiments, which does not depart from the technical essence of the present application, are still within the scope of the present application.
Claims
1. An insert structure for an injection mold for use in an injection mold, characterized by, The application relates to a plastic injection mold structure, which comprises the following parts: a first insert (1) with a through hole (11) arranged coaxially, at least one group of exhaust holes (12) distributed on the side wall of the first insert (1), the exhaust holes (12) penetrating the side wall of the first insert (1) and communicating with the through hole (11); a second insert (2) coaxially arranged in the through hole (11) and forming a gap with the side wall of the through hole (11), the gap communicating with the exhaust holes (12); an exhaust steel (3) embedded on the side wall of the first insert (1) and located at the air inlet end of the exhaust holes (12).
2. An insert structure for an injection mold according to claim 1, wherein A sunken groove (14) is formed on the end face of one end of the first insert (1); one end of the second insert (2) is formed with a limiting block (21) abutting against the sunken groove (14).
3. An insert structure for an injection mold according to claim 2, wherein A first plane (22) is formed on the surface of the second insert (2), and the first plane (22) forms an exhaust gap with the side wall of the through hole (11).
4. An insert structure for an injection mold according to claim 3, wherein A second plane (23) is formed on the limiting block (21), and the first plane (22) and the second plane (23) are located on the same plane and connected into one piece.
5. The insert structure for injection mold according to claim 2, wherein An exhaust gap (13) is formed between the limiting block (21) and the side wall of the sunken groove (14), and the exhaust gap (13) respectively communicates with the through hole (11) and an exhaust channel of the injection mold.
6. An insert structure for an injection mold according to claim 5, wherein The exhaust holes (12) comprise at least one group of radial exhaust holes (121) distributed on the side wall of the first insert (1) in a radial direction, and the radial exhaust holes (121) communicate with the exhaust gap (13) through the gap.
7. An insert structure for an injection mold according to claim 5, wherein The exhaust holes (12) comprise at least one axial exhaust hole (122) arranged in parallel to the axial direction of the first insert (1) and located in the side wall of the first insert (1), and the air outlet end of the axial exhaust hole (122) communicates with the through hole (11) through the exhaust gap (13).
8. An injection mould structure comprising a fixed mould (4) and a movable mould (5), characterised in that, The application further relates to the following: the insert structure in any one of claims 1-7; the insert structure is arranged on the fixed mold (4).
9. A plastic injection mold structure according to claim 8, wherein The fixed mold (4) comprises: a fixed mold body (41); a fixed mold core (42) detachably arranged on the fixed mold body (41) and having a through hole (421) and a limiting wall (422) located at the end of the through hole (421), and the first insert (1) is coaxially arranged in the through hole (421); a limiting piece (43) arranged on the fixed mold core (42) so that the limiting part (15) on the first insert (1) is axially limited between the limiting wall (422) and the limiting piece (43).
10. A plastic injection mold structure according to claim 9, wherein The limiting block (21) is axially limited between the limiting piece (43) and the bottom surface of the sunken groove (14) of the end face of the first insert (1).
11. The injection mold structure of claim 8, wherein The movable mold (5) is provided with a movable mold core (51), and in the closed state of the fixed mold (4) and the movable mold (5), the insert structure is at least partially inserted into the cavity of the movable mold core (51) and forms a molding cavity (6) of an injection product between the insert structure and the cavity wall.