WO2023040048A1

WO2023040048A1 - Injection mold slider-driven core-pulling undercut-releasing mechanism

Info

Publication number: WO2023040048A1
Application number: PCT/CN2021/132957
Authority: WO
Inventors: 梁正华; 梁凯; 王华良; 林连明
Original assignee: 浙江凯华模具有限公司
Priority date: 2021-09-14
Filing date: 2021-11-25
Publication date: 2023-03-23
Also published as: CN113752485A; CN113752485B

Abstract

Disclosed is an injection mold slider-driven core-pulling undercut-releasing mechanism, comprising a mold core (1) and a mold cavity, a mold core insert (2) being disposed in the mold core (1), and further comprising a core-pulling undercut-releasing assembly. The core-pulling undercut-releasing assembly comprises a slider core-pulling assembly fixed onto the mold core insert (2) and a core-pulling driving assembly disposed on the mold core. The injection mold slider-driven core-pulling undercut-releasing mechanism achieves core-pulling from a side surface of a product to avoid inconvenience in core pulling caused by interference. Mold manufacturing costs are reduced, and production efficiency is increased.

Description

A slider-driven core-pulling mechanism for injection molds

technical field

The invention relates to the technical field of injection molds, in particular to an injection mold slider-driven core-pulling release mechanism.

Background technique

Injection molding is an important means of product forming. Injection molding is the process of making various plastic materials into products that people need by using the principle of plastic materials changing shape under high temperature and high pressure. At present, due to assembly problems of some plastic products, when the mounting holes on the side are close together, if the traditional design is directly used for inclined top or slider, interference is likely to occur and core pulling cannot be completed normally.

For example, the "improved structure of an injection mold core-pulling mechanism" disclosed in the Chinese patent literature, its announcement number CN204566579U, includes a movable mold base, a movable mold plate, a fixed mold base and a fixed mold plate, and the movable mold plate is fixed in the movable mold base. The fixed template is fixed in the fixed mold seat, the movable mold core is installed in the movable template, the fixed mold core is installed in the fixed template, the movable mold core is connected with the movable mold core core-pulling mechanism, and the fixed mold core is connected with the fixed mold core core-pulling mechanism , is characterized in that: the moving core-pulling mechanism and the fixed core-pulling mechanism are respectively connected with a first core-pulling cylinder and a second core-pulling cylinder. The utility model does not need to be driven by an injection molding machine tool, and meets the requirements of existing plastic products with complex structures and multi-directional core pulling. However, in this utility model, when the mounting holes on the side are relatively close, the injection mold will It is easy to interfere and cause inconvenience.

Contents of the invention

The present invention aims to overcome the problems in the above prior art that when the side mounting holes are close together, the traditional core-pulling method is prone to interfere and cause inconvenience in core-pulling. The core-pulling on the side of the product is avoided, and the inconvenience of core-pulling caused by interference is avoided; the cost of mold manufacturing is reduced, and the production efficiency is improved.

In order to achieve the above object, the present invention adopts the following technical solutions:

An injection mold slider drives a core-pulling and undercut mechanism, including a core and a cavity, a core insert is arranged in the core, and a core-pulling and undercut assembly, which includes a core-pulling and undercut assembly fixed on The slider core-pulling assembly on the core insert and the core-pulling drive assembly arranged on the core. In this technical solution, the core-pulling component is removed from the undercut assembly to realize the core-pulling of the injection molded product, wherein the core-pulling drive component drives the slider core-pulling component to move, thereby enabling the slider core-pulling component to complete the side core-pulling of the product, even The installation holes on the left and right sides of the slider core-pulling assembly are too close, and it will not affect the normal core-pulling operation. The injection mold is not easy to interfere, and it will not cause inconvenience to the core-pulling, which improves the production efficiency, and the structure It is simple and reduces the cost of mold production.

Preferably, the slider core-pulling assembly includes a core-pulling slider and a slider guide for driving the core-pulling slider to move, the core-pulling slider is slidably arranged on the core insert, and the slider guide slides Set on the core-pulling slider, the slider guide connects the core-pulling slider and the core-pulling drive assembly. The core-pulling slider is set in contact with the product. When pulling the core, the core-pulling drive assembly drives the slider guide to slide, and the slider guide slides to drive the core-pulling slider to move so that the side of the core-pulling slider is separated from the product to complete the core-pulling. The structure and operation are simple and convenient.

As a preference, a guide chute is provided on the core-pulling slider, a slideway is provided on the slider guide, the slideway is embedded in the guide chute, the guide chute is inclined, and the guide chute and the slider guide The direction of movement forms an included angle. The moving direction of the slider guide is not consistent with the moving direction of the guide chute, and the moving direction of the guide chute and the slider guide forms an included angle, which makes the slider guide drive the core-pulling slider along the When the slider guide structure moves, the core-pulling slider moves toward the direction close to the slider guide, so as to realize side core pulling.

Preferably, a slider guiding structure for controlling the moving direction of the core-pulling slider is provided between the core-pulling slider and the core insert. The slider guiding structure includes a limiting chute arranged at the bottom of the core-pulling slider and a The core insert is an upper limit slider, and the limit chute is sleeved outside the limit slider. The setting of the slider guide structure is used to limit the moving direction of the core-pulling slider, so that the moving direction of the core-pulling slider is consistent with the axial direction of the mounting hole formed on the product after core-pulling, so as to avoid interference.

Preferably, the core-pulling drive assembly includes a sliding seat and a driving structure for driving the sliding seat to move, the sliding seat is slidably arranged on the core, the driving structure includes a shovel base slidably arranged on the sliding seat, and a driving structure for driving the sliding seat to move. The inclined guide post is fixedly connected with the shovel base and the cavity, and the upper end of the inclined guide post is fixed on the shovel base. The slider is connected with the slider guide, so that the movement of the slider guide can be driven by the movement of the slider. The shovel base is fixed on the cavity, and the upper end of the inclined guide post is clamped on the shovel base, which makes the cavity move upwards. During the process, the sliding seat is driven to move, that is, the core-pulling slider is driven to perform side core-pulling while the cavity moves up, which avoids additional ejection operations and improves production efficiency.

Preferably, the slanted guide post obliquely passes through the slide seat, and the upper end of the slanted guide post is arranged close to the core-pulling assembly of the slider. This makes the sliding seat move away from the slider core-pulling assembly during the upward movement of the inclined guide column, and then drives the slider guide to move through the sliding seat to realize side core pulling.

Preferably, a spring hole is provided on one end surface of the slide seat close to the core insert, and an auxiliary spring is arranged in the spring hole. One end of the auxiliary spring is fixed on the core insert, and the other end is fixed on the bottom of the spring hole of the slide seat. The setting of the auxiliary spring is mainly used to assist the sliding seat to slide. In the initial state (before core pulling starts), the auxiliary spring is in a compressed state, which is convenient to push the sliding seat, and then assist the sliding seat to slide. In addition, when the cavity rises to a certain height Finally, the inclined guide post will be separated from the sliding seat, and the setting of the auxiliary spring also limits the position of the inclined guide post to prevent the position of the sliding seat from changing after the inclined guide post leaves the sliding seat. This setting will not affect the operation of the inclined guide post when it is used again the insertion.

Preferably, a wear-resistant plate is arranged between the sliding seat and the core, and a wear-resistant plate is also arranged between the core-pulling slider and the core insert. The setting of the wear-resistant plate avoids the direct contact between the slide seat and the core, and also avoids the direct contact between the core-pulling slider and the core insert, reduces the wear of the core and the core insert, and improves the Service life of cores and core inserts.

Therefore, the present invention has the following beneficial effects: the core-pulling on the side of the product is realized, and the inconvenience of core-pulling caused by interference is avoided; the mold manufacturing cost is reduced; the core-pulling slider is driven to perform core-pulling while the cavity is moved up, avoiding additional topping out of operation, improving production efficiency; the setting of wear-resistant plates reduces the wear of the core and core inserts, and improves the service life of the core and core inserts.

Description of drawings

Fig. 1 is a schematic diagram of the first structure of the core-pulling and undercut assembly;

Fig. 2 is a schematic structural view of the core-pulling and undercut assembly after the slider guide is hidden;

Fig. 3 is a cross-sectional view of the core-pulling and undercut assembly;

Fig. 4 is a schematic structural view of the slider guide;

Fig. 5 is a structural schematic diagram of a core-pulling slider;

Fig. 6 is a schematic structural view of an injection mold slider driving a core-pulling and tripping mechanism;

In the figure: 1, core 2, core insert 3, core pulling slider 301, guide chute 302, limit chute 303, protruding post 4, slider guide 401, slideway 5, slide seat 6 , Inclined guide post 7, shovel base 8, wear-resistant plate 9, limit slider 10, auxiliary spring.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1:

In the embodiment 1 shown in Fig. 1 and Fig. 6, an injection mold slider drives the core-pulling and tripping mechanism, which includes an upper double plate and a lower double plate. A cavity is connected under the upper double plate. A hot runner plate is connected to the plate, a hot runner fixing plate is set on the hot runner plate, a square iron is connected to the hot runner fixing plate, a core 1 is set on the square iron, and a thimble plate is arranged between the core and the square iron , a core insert 2 is arranged in the core. A slider-driven core-pulling and undercut mechanism for an injection mold also includes a core-pulling and undercut assembly, which includes a slider core-pulling assembly disposed in the core insert 2 and a core-pulling assembly disposed on the core The core-pulling drive assembly is used to drive the slider core-pulling assembly to move.

As shown in Figure 2, the slider core-pulling assembly includes a core-pulling slider 3 slidably arranged on the core insert 2, a slider guide structure for controlling the moving direction of the core-pulling slider, and a slider for connecting the core-pulling slider. 3 and the slider guide 4 of the core-pulling drive assembly. The sliding connection between the core-pulling slider 3 and the slider guide 4 is provided with a guide chute 301 on the core-pulling slider 3, and the depth of the groove wall of the guide chute toward the inner side of the core-pulling slider is greater than that of the guide chute toward the core-pulling slider. The depth of the groove wall on the outside of the slider, and the groove wall on the inside of the guide chute extends upwards to form an integrated slope structure with the core-pulling slider. Wedge settings. A slideway 401 is provided on the slider guide 4 , the slideway 401 is embedded in the guide chute 301 , and the movement direction of the guide chute 301 and the slider guide 4 forms an included angle. During the core-pulling process, the slider guide 4 drives the core-pulling slider 3 to move along the slider guide structure, and the core-pulling slider 3 moves toward the direction close to the slider guide 4 . In addition, a protruding column 303 for forming a mounting hole is provided on the core-pulling slider 3, and the moving direction of the core-pulling slider 3 is parallel to the axial direction of the protruding column 303/installation hole.

As shown in Fig. 2, Fig. 4 and Fig. 5, the slider guide structure includes a limit slide 302 arranged at the bottom of the core-pulling slider 3 and a limit slider 9 fixed on the core insert 2, the limit Slider 9 is set as a T-shaped structure, and the limit chute 302 is set in cooperation with the limit slider 9. The setting of the T-shaped structure limits the upper and lower directions of the core-pulling slider 3, preventing the core-pulling slider 3 from slipping. slide out of the block guide assembly. The sliding direction of the core-pulling slider 3 intersects the sliding direction of the slider guide 4 , that is, there is an angle between the sliding direction of the core-pulling slider 3 and the sliding direction of the slider guide 4 . In this embodiment, the sliding direction of the core-pulling slider 3 is perpendicular to the sliding direction of the slider guide 4 . That is to say, when the slider guide 4 moves toward the direction of the core-pulling drive assembly, it drives the core-pulling slider 3 to move, and the core-pulling slider 3 is perpendicular to the movement direction of the slider guide 4 along the limit slider 9 slide. In order to ensure the sliding reliability of the core-pulling slider 3 , at least two slider guiding structures are arranged at the bottom of the core-pulling slider 3 .

As shown in Figure 4, the slider guide 4 is configured as a wedge-shaped block, including two wedge-shaped inclined side walls, and the slideway 401 is integrally extended with the inclined side walls and arranged under the inclined side walls on both sides of the slider guide 4, and The wedge-shaped small end of the slider guide 4 is set toward one end of the product, and the large end is set away from the end of the product. When in use, the slider guide 4 cooperates with two core-pulling sliders 3, and the slideways 401 on both sides of the slider guide 4 Slidingly cooperate with the guide chute 301 on the two core-pulling sliders respectively, and the inclined side wall of the slider guide 4 fits closely with the wedge-shaped surface on the core-pulling slider 3, which makes the slider guide 4 slide During the process, the core-pulling slider 3 supports each other, which improves the reliability of the slider guide 4 during the sliding process. In addition, in this embodiment, the core-pulling sliders 3 are arranged in pairs on both sides of the slider guide 4. During the core-pulling process, the slider guide 4 moves away from the product under the drive of the core-pulling drive assembly. The two core-pulling sliders 3 move in a direction perpendicular to the moving direction of the slider guide 4, and the two core-pulling sliders are close to each other, so that the side of the core-pulling slider 3 is separated from the product to realize side core-pulling , correspondingly in this embodiment, the slider guide 4 has a trapezoidal structure, and the two hypotenuses of the slider guide 4 are fitted with the slider cores on both sides respectively, and the slider guide 4 is close to the side of the product The length of the bottom edge is less than the length of the bottom edge on the side away from the product.

As shown in Figure 5 and Figure 6, the core-pulling drive assembly includes a sliding seat 5 and a driving structure for driving the sliding seat 5 to move. The shovel base 7, the inclined guide post 6 used to drive the slider 5 to move, the slider 5 is connected with the slider guide 4, so that the movement of the slider 5 can drive the slider guide 4 to move, the slider 5 and the shovel base 7 are respectively provided with inclined perforations, and the inclined guide post 6 is obliquely pierced through the slide seat 5 and the shovel base 7. The upper end of 6 is clamped on the shovel base 7, as shown in Figure 3, specifically, the upper end of the inclined guide post 6 is provided with a clamping protrusion, and the corresponding perforation of the shovel base 7 is provided with a protrusion for realizing the clamping. Connected snap-in slot.

When in use, the cavity drives the shovel base 7 to move upwards. Since the upper end of the shovel base 6 is clamped on the shovel base 7, the shovel base 7 drives the shovel base 6 to move when moving. Because the slant guide post 6 It is set obliquely, and the upper end of the inclined guide post 6 is set close to the core-pulling assembly of the slider, which makes the sliding seat 5 move to the side away from the product during the upward movement of the inclined guide post 6, and then drives the slider guide 4 to move away from the product. One side of the slider moves so that the slider guide 4 is first separated from the product, and then the slider guide 4 drives the core-pulling slider 3 to move along the slider guide structure, and the moving direction is perpendicular to the moving direction of the slider guide 4, that is The two core-pulling sliders move relatively and approach each other, so that the core-pulling slider 3 is separated from the product to complete the core-pulling, and finally the product is ejected to complete the undercut.

In addition, a spring hole is provided on the end surface of the slide seat 5 near the end of the core insert 2, and an auxiliary spring 10 is arranged in the spring hole. One end of the auxiliary spring 10 is fixed on the core insert 2, and the other end is fixed on the slide seat. 5, the auxiliary spring 10 is used to assist the sliding seat 5 to slide. In addition, after the cavity rises to a certain height, the inclined guide post 6 will break away from the sliding seat 5, and the setting of the auxiliary spring 10 also supports the inclined guide post 6. The position is limited to avoid that after the inclined guide post 6 is separated from the slide seat 5, the position of the slide seat 5 will change and affect the insertion of the inclined guide post, so as to facilitate the smooth use after the next mold clamping.

In addition, as shown in Figure 3, in order to improve the service life of the sliding seat 5, the core-pulling slider 3, the core and the core insert 2, a wear-resistant plate 8 is arranged between the sliding seat 5 and the core. A wear plate 8 is also arranged between the core slider 3 and the core insert 2 . The core insert 2 is provided with an installation groove for installing the wear plate 8, and the thickness of the wear plate 8 is greater than the depth of the installation groove, which makes the upper surface of the wear plate 8 after the installation of the wear plate 8 is completed. It is higher than the core insert 2 to ensure that the core-pulling slider 3 is attached to the wear-resistant plate 8 .

It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the above description refer to the directions in the drawings, and the words "inner" and "outer ” refer to directions towards or away from the geometric center of a particular part, respectively.

The above embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. Those skilled in the art can make various other corresponding changes and deformations according to the above-described technical solutions and concepts, and all these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

An injection mold slider drives a core-pulling release mechanism, comprising a core (1) and a cavity, and a core insert (2) is arranged in the core (1), and is characterized in that it also includes a core-pulling release mechanism. The undercut assembly, core-pulling release The underturn assembly includes a slider core-pulling assembly fixed on the core insert (2) and a core-pulling drive assembly arranged on the core (1).
According to claim 1, an injection mold slider drives a core-pulling mechanism, wherein the slider core-pulling assembly includes a core-pulling slider (3) and a core-pulling slider (3) for driving the core-pulling slider (3) ) moving slider guide (4), the core-pulling slider (3) is slidably arranged on the core insert (2), and the slider guide (4) is slidably arranged on the core-pulling slider (3) , the slider guide (4) connects the core-pulling slider (3) and the core-pulling drive assembly.
According to claim 2, an injection mold slider drives a core-pulling release mechanism, which is characterized in that a guide chute (301) is provided on the core-pulling slider (3), and a guide chute (301) is provided on the slider guide (4 ) is provided with a slideway (401), the slideway (401) is embedded in the guide chute (301), the guide chute (301) is inclined, the guide chute (301) and the slider guide (4) The direction of movement forms an included angle.
According to claim 2, an injection mold slider drives a core-pulling tripping mechanism, wherein a device for controlling the core-pulling slider (3) and the core insert (2) is provided between the core-pulling slider (3) and the core insert (2). The slider guide structure in the moving direction of the block (3), the slider guide structure includes a limit chute (302) arranged at the bottom of the core-pulling slider and a limit slider (9) fixed on the upper limit of the core insert, the limit slide The slot (302) is sleeved outside the limit slider (9).
According to any one of claims 2 to 4, an injection mold slider drives a core-pulling release mechanism, wherein the core-pulling drive assembly includes a sliding seat (5) and a driving structure for driving the sliding seat to move , the sliding seat (5) is slidably arranged on the core (1), the driving structure includes a shovel base (7) slidably arranged on the sliding seat, an inclined guide post (6) for driving the sliding seat to move, the shovel base (7) ) is fixedly connected with the cavity, and the upper end of the inclined guide post (6) is fixed on the shovel base (7).
According to claim 5, an injection mold slide block drives a core-pulling release mechanism, characterized in that, the inclined guide post (6) is obliquely pierced through the sliding seat (5), and the upper end of the inclined guide post (6) is close to Slider core pull assembly settings.
According to any one of claim 5, an injection mold slider drives a core-pulling release mechanism, wherein a spring hole is provided on the end surface of the slide seat (5) close to the end of the core insert (2) , an auxiliary spring (10) is arranged in the spring hole, one end of the auxiliary spring (10) is fixed on the core insert (2), and the other end is fixed on the bottom of the spring hole of the slide seat.
According to claim 5, a kind of injection mold slide block drives the core-pulling and undercutting mechanism, a wear-resistant plate (8) is arranged between the slide seat (5) and the core (1), and the core-pulling slide block ( 3) and a wear-resistant plate (8) is also arranged between the core insert (2).