Pitched roof sliding block structure and application method

Abstract

The invention relates to a pitched roof sliding block structure and an application method, the pitched roof sliding block structure comprises a lower die base, a sliding block insert is arranged on the outer side of the lower die base in a sliding mode, and the surface of one side of the sliding block insert is a forming face; two inclined through holes are formed in the forming surface, and a first strip-shaped insert and a second strip-shaped insert respectively penetrate through the two inclined through holes; a driving unit is arranged on the lower die holder; an insert limiting block is arranged on the lower die base in a sliding mode, a limiting groove is formed in the insert limiting block, and the insert limiting block is connected with the lower die base through an elastic piece. Before injection molding, a first movable gap exists between the sliding block insert and the insert limiting block; when the elastic piece is not deformed, a second movable gap exists between the insert limiting block and the lower die holder; the core problems of space conflict, low efficiency, high cost and the like in opposite back-off product mold design are solved, the mold has the advantages of being compact in structure, efficient in demolding, controllable in cost, high in product yield and the like, and a reliable technical scheme is provided for the field of precise injection molding.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of plastic films, in particular to a slanted ejection slide block structure and an application method. BACKGROUND

[0002] In the field of injection molding, products with undercut structures (such as buckles, threads, and internal grooves) are widely used in electronics, home appliances, and automotive parts. The undercut structure makes it impossible for the product to be directly ejected by simply opening the mold direction, and mechanisms such as side core pulling, slanted ejection, and slide blocks are required to achieve ejection. However, when the product has opposite undercuts (i.e., the undercut structure is located on opposite sides of the product, and the ejection direction is opposite), the traditional mold design faces the following technical bottlenecks: (1) Complex mold structure, serious space conflict; Opposite undercuts require core pulling or slide block mechanisms on both sides of the mold, but their motion trajectories may interfere with each other. For example, when both slide blocks move towards the center of the product at the same time, collision is likely to occur. If they act at different times, a time delay control device needs to be added, resulting in a bulky mold structure and increased size. This is particularly true for small and precise products (such as connectors and micro gearboxes), which have a serious lack of mold space.

[0003] (2) Low ejection efficiency, long molding cycle; To avoid interference, the traditional mold often uses a "step ejection" strategy: one side slide block first pulls the core, and the other side then acts. This process requires multiple mold opening and closing or sequential control, significantly prolonging the single injection molding cycle (usually increasing by 30%-50%), reducing production efficiency, and making it difficult to meet mass production demands.

[0004] (3) High cost, difficult maintenance; Complex molds require high-precision slide blocks, guide rails, and hydraulic / pneumatic control systems, which are difficult to process and costly to manufacture (40%-70% more than ordinary molds). At the same time, the multiple moving parts are prone to wear and jam, resulting in high failure rates and maintenance costs.

[0005] (4) High risk of product defects; The melt flow path in the opposite undercut area is complex, and if the slide block gap control is not proper, defects such as flash and sink marks may occur. During the ejection process, if the forces on both sides are uneven, the product may deform or be damaged, making it difficult to ensure the yield.

[0006] Currently, common solutions for opposite undercuts include: 1. Hydraulic core pulling: the slide block is driven by a hydraulic cylinder, but it requires an external oil line, which occupies a lot of space and the oil temperature changes can affect the stability of the action; 2. Manual picking: suitable for small batch trial production, but cannot achieve automated production.

[0007] These solutions cannot fundamentally solve the problems of space conflict, low efficiency and high cost caused by the opposite reverse buckling. Therefore, there is an urgent need for a diagonal top slide structure for opposite reverse buckling. SUMMARY

[0008] The technical problem to be solved by the present application is to provide a diagonal top slide structure and a method for applying the diagonal top slide structure, which solves the above-mentioned defects of the prior art.

[0009] The technical solution adopted by the present application to solve its technical problem is: A diagonal top slide structure is constructed, which comprises a lower mold base, a product forming cavity is arranged on the lower mold base, a slide block insert matched with the product forming cavity is arranged on the outer side of the lower mold base, and one side surface of the slide block insert is a forming surface; two diagonal through holes are arranged on the forming surface, and a first strip-shaped insert and a second strip-shaped insert for processing opposite reverse buckling of a product are respectively arranged in the two diagonal through holes; a driving unit for driving the slide block insert is arranged on the lower mold base; an insert limiting block is arranged on the lower mold base in a sliding manner, a limiting groove for limiting the sliding direction of the first strip-shaped insert and the second strip-shaped insert is arranged on the insert limiting block, and the insert limiting block and the lower mold base are connected through an elastic element; a first movable gap exists between the slide block insert and the insert limiting block before injection molding; and a second movable gap exists between the insert limiting block and the lower mold base when the elastic element is not deformed.

[0010] In the diagonal top slide structure, the first strip-shaped insert and the second strip-shaped insert are both in the shape of a long strip, and a buckle position forming convex for forming the reverse buckling of a product is arranged on the side surface of the front end of each of the first strip-shaped insert and the second strip-shaped insert; the directions of the two buckle position forming convexes are opposite or opposite.

[0011] In the diagonal top slide structure, the left and right outer side surfaces of the first strip-shaped insert and the second strip-shaped insert are both provided with a sliding groove; and the bottom surface of the sliding groove is in close contact with the inner wall of the limiting groove.

[0012] In the diagonal top slide structure, the insert limiting block comprises a base, a limiting block is arranged on the base, and a movable groove matched with the limiting block is arranged on the lower surface of the slide block insert.

[0013] In the diagonal top slide structure, the top end of the limiting block is provided with the limiting groove, and the first strip-shaped insert and the second strip-shaped insert are both longitudinally slid in the limiting groove.

[0014] In the diagonal top slide structure, the lower mold base is provided with an accommodating hole for accommodating the base; one end of the elastic element abuts against the base, and the other end abuts against the inner wall of the accommodating hole.

[0015] The application method of the inclined top sliding block structure is applied to the inclined top sliding block structure as described above, wherein the method comprises: Before injection molding, the driving unit pushes the sliding block insert into the lower mold base, a first movable gap exists between the sliding block insert and the insert limiting block, the elastic member is not deformed, and a second movable gap exists between the insert limiting block and the lower mold base; the first strip-shaped insert, the second strip-shaped insert and the forming surface combine to form an injection molding processing surface; After injection molding, before mold opening, the driving unit pulls the sliding block insert outwards by a distance of the first movable gap, and the forming surface is separated from the product; at this time, the insert limiting block does not act under the elastic force of the elastic member, the first strip-shaped insert and the second strip-shaped insert are pulled to slide along the limiting groove under the action of the two inclined through holes, and the undercut is removed; The driving unit continues to pull the sliding block insert outwards by a distance of the second movable gap, so that the insert limiting block moves outwards with the sliding block insert, and the first strip-shaped insert and the second strip-shaped insert are completely separated from the product.

[0016] The beneficial effects of the present application are that the present application solves the core problems of space conflict, low efficiency and high cost in the design of the mold for the opposite undercut product through the innovative staged demolding mechanism, has the advantages of compact structure, efficient demolding, controllable cost, high product yield, etc., and provides a reliable technical solution for the field of precision injection molding. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the present application will be further described below in conjunction with the drawings and embodiments. The drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor: Figure 1 is a structural schematic diagram of the inclined top sliding block structure of the preferred embodiment of the present application; Figure 2 is a sectional view of the inclined top sliding block structure of the preferred embodiment of the present application; Figure 3 is an exploded view of the inclined top sliding block structure of the preferred embodiment of the present application; Figure 4 is an exploded view of the inclined top sliding block structure of the preferred embodiment of the present application from another perspective; Figure 5 is an enlarged schematic diagram of the product of the inclined top sliding block structure of the preferred embodiment of the present application. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0019] The preferred embodiment of the inclined top slider structure of the present invention, such as Figure 1 As shown, see also Figures 2-5 The system includes a lower mold base 1, which has a lateral product molding cavity. A slider insert 2, which slidably engages with the product molding cavity, is slidably disposed on the outer side of the lower mold base 1. One side surface of the slider insert 2 is a molding surface 20. The molding surface 20 has two oblique through holes 21 (distributed in a figure-eight shape) through which a first strip insert 3 and a second strip insert 4, which are machined with opposing undercuts 8 for the product, are respectively inserted. A drive unit 5 for driving the slider insert 2 is disposed on the lower mold base 1. An insert limiting block 6 is slidably disposed on the lower mold base 1. The insert limiting block 6 has a limiting groove 60 that limits the sliding direction of the first strip insert 3 and the second strip insert 4. The insert limiting block 6 is connected to the lower mold base 1 through an elastic member 7. Before injection molding, there is a first movable gap 10 between the slider insert 2 and the insert limiting block 6. When the elastic member 7 is not deformed, there is a second movable gap 11 between the insert limiting block 6 and the lower mold base 1. Before injection molding, the drive unit 5 pushes the slider insert 2 into the lower mold base 1. There is a first movable gap 10 between the slider insert 2 and the insert limiting block 6. The elastic element 7 does not deform. There is a second movable gap 11 between the insert limiting block 6 and the lower mold base 1. The first strip insert 3, the second strip insert 4 and the molding surface 20 are combined to form the injection molding surface. After injection molding and before mold opening, the drive unit 5 pulls the slider insert 2 outward by the distance of the first movable gap 10, and the molding surface 20 is separated from the product; at this time, the insert limiting block 6 does not move under the elastic force of the elastic element 7, and the first strip insert 3 and the second strip insert 4 are pulled along the limiting groove 60 under the action of the two oblique through holes 21 to perform the unhooking. The drive unit 5 continues to pull the slider insert 2 outward by the distance of the second movable gap 11, so that the insert limiting block 6 moves outward with the slider insert 2, and the first strip insert 3 and the second strip insert 4 are completely separated from the product.

[0020] This invention solves the core problems of space conflict, low efficiency, and high cost in the design of molds for products with opposing undercuts by adopting an innovative staged demolding mechanism. It also has the advantages of compact structure, high demolding efficiency, controllable cost, and high product yield, providing a reliable technical solution for the field of precision injection molding. The specific details are as follows: 1. Resolve spatial conflicts and achieve a compact design; By setting the first active gap 10 and the second active gap 11, the demolding action is divided into three stages: "separation from the forming surface 20 → inclined demolding of the undercut → overall core pulling", avoiding the risk of interference when the two sliders move simultaneously.

[0021] First stage: the driving unit 5 only pulls the slider insert 2 to move the first active gap 10, making the forming surface 20 separate from the product, at this time the insert limit block 6 remains stationary, reserving space for subsequent inclined demolding; Second stage: the first strip insert 3 and the second strip insert 4 slide along the limit groove 60 under the guidance of the inclined through hole 21, realizing the inclined demolding of the undercut structure, which does not require additional power source and can be completed using the mold opening force; Third stage: the driving unit 5 continues to pull the slider insert 2, driving the insert limit block 6 to pull the core, and finally completely separates from the product.

[0022] The three-stage action is closely linked, greatly reducing the horizontal size of the mold, especially suitable for small and precise product mold design (such as connectors, micro gear boxes).

[0023] 2. Improve demolding efficiency and shorten molding cycle; Traditional step-by-step demolding requires multiple mold opening and closing or sequential control, while the present application can complete all demolding actions through single continuous driving (one pull of the driving unit 5): The continuous movement of the slider insert 2 naturally triggers inclined demolding and overall core pulling, without the need for additional delay valves or step controllers; The demolding process is smooth and coherent, and the single injection molding cycle can be shortened by more than 30%, significantly improving large-scale production efficiency.

[0024] 3. Reduce mold cost and simplify maintenance process; Structural simplification: only one driving unit 5 (such as a hydraulic cylinder) is needed to control multiple insert actions, reducing additional components such as hydraulic oil lines and air cylinders, and the mold manufacturing cost is reduced by more than 40%; Reliability improvement: the elastic member 7 (such as a spring) only needs to provide cushioning in the second stage, avoiding long-term high-load deformation and prolonging the service life; the inclined through hole 21 and the limit groove 60 are standardized for processing, with easy-to-control precision, reducing maintenance frequency.

[0025] 4. Improve product yield and reduce defect risk; Precise demolding: the three-stage action ensures that the undercut structure is evenly stressed during demolding, avoiding product deformation or damage; Tight fit: during injection molding, the slider insert 2 and the insert limit block 6 are tightly fitted through the first active gap 10, with high assembly precision of the forming surface 20, effectively preventing defects such as flash and sink marks; Strong stability: each stage action is guided by mechanical structure, avoiding demolding instability caused by manual operation or hydraulic fluctuation, and the product consistency is good.

[0026] 5. Wide application range and strong compatibility; It can adapt to different sizes of opposite reverse buckling 8 structures (such as buckle spacing and reverse buckling depth variation), and only needs to adjust the angle of the inclined through hole 21 and the size of the movable gap; The driving unit 5 can be hydraulic, pneumatic or electric, and can flexibly match the needs of different production scenes.

[0027] Preferably, the first strip insert 3 and the second strip insert 4 are both long strips, and the front end of each side surface is provided with a buckle forming protrusion 30 for forming a product reverse buckle; the directions of the two buckle forming protrusions 30 are opposite or opposite, and the specific shape and size are determined according to the needs of the opposite reverse buckle structure on the product.

[0028] Preferably, the left and right outer surfaces of the first strip insert 3 and the second strip insert 4 are both provided with a sliding groove 31; the bottom surface of the sliding groove 31 is in close contact with the inner wall of the limiting groove 60; through the cooperation and engagement of the two grooves, the sliding and limiting are completed, the processing is simple, and the cost is low.

[0029] Preferably, the insert limiting block 6 includes a base 61, the base 61 is provided with a limiting block 62, the lower surface of the sliding block insert 2 is provided with a movable groove 22 matched with the limiting block; the top end of the limiting block 62 is provided with a limiting groove 60, the first strip insert 3 and the second strip insert 4 are both longitudinally sliding in the limiting groove 60; the lower die seat 1 is provided with a containing hole 12 accommodating the base 61; one end of the elastic member 7 abuts against the base 61, and the other end abuts against the inner wall of the containing hole 12; The purpose of this structure design is to make the installation more simple, first install the base 61 and the elastic member 7 into the containing hole 12, then install the sliding block insert 2 onto the lower die seat 1, and the first strip insert 3 and the second strip insert 4 are correspondingly clamped into the limiting groove 60.

[0030] A method for applying the inclined top sliding block structure, applied to the inclined top sliding block structure as described above, wherein the method comprises: Before injection molding, the driving unit 5 pushes the sliding block insert 2 into the lower die seat 1, there is a first movable gap 10 between the sliding block insert 2 and the insert limiting block 6, the elastic member 7 is not deformed, and there is a second movable gap 11 between the insert limiting block 6 and the lower die seat 1; the first strip insert 3, the second strip insert 4 and the forming surface 20 combine to form an injection molding processing surface; After injection molding, before opening the mold, the driving unit 5 pulls the slider insert 2 out of the first active gap 10 by a distance, and the molding surface 20 is separated from the product; at this time, the insert limiting block 6 does not act under the elastic force of the elastic element 7, the first strip-shaped insert 3 and the second strip-shaped insert 4 are pulled to slide along the limiting groove 60 under the action of the two inclined through holes 21, and the product is pulled out of the undercut; The driving unit 5 continues to pull the slider insert 2 out of the second active gap 11 by a distance, so that the insert limiting block 6 moves outward with the slider insert 2, and the first strip-shaped insert 3 and the second strip-shaped insert 4 are completely separated from the product.

[0031] The present application solves the core problems of space conflict, low efficiency and high cost in the design of the product mold of the opposite undercut 8 by the innovative staged demolding mechanism, has the advantages of compact structure, efficient demolding, controllable cost, high product yield and the like, and provides a reliable technical scheme for the field of precise injection molding.

[0032] It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

Claims

1. A ramped slider structure, characterized by, The lower die base is provided with a lateral product forming cavity, and the outer side of the lower die base is slidingly provided with a slider insert matched with the product forming cavity, and one side surface of the slider insert is a forming surface; the forming surface is provided with two inclined through holes, and a first strip-shaped insert and a second strip-shaped insert for processing opposite counterbore of the product are respectively arranged in the two inclined through holes; the lower die base is provided with a driving unit for driving the slider insert; the lower die base is slidingly provided with an insert limiting block, the insert limiting block is provided with a limiting groove for limiting the sliding direction of the first strip-shaped insert and the second strip-shaped insert, and the insert limiting block and the lower die base are connected through an elastic element; before injection molding, there is a first movable gap between the slider insert and the insert limiting block; when the elastic element is not deformed, there is a second movable gap between the insert limiting block and the lower die base.

2. The inclined top slide structure according to claim 1, wherein The first strip-shaped insert and the second strip-shaped insert are both long strips, and the side surface of the front end of each is provided with a buckle position forming convex for forming counterbore of the product; the directions of the two buckle position forming convexes are opposite or opposite.

3. The inclined top slide structure according to claim 2, wherein The left and right outer side surfaces of the first strip-shaped insert and the second strip-shaped insert are both provided with sliding grooves; the bottom surface of the sliding groove is matched with the inner wall of the limiting groove.

4. The inclined top slide structure according to claim 3, wherein The insert limiting block comprises a base, and the base is provided with a limiting block; the lower surface of the slider insert is provided with a movable groove matched with the limiting block.

5. The inclined top slide structure according to claim 4, wherein The top end of the limiting block is provided with the limiting groove, and the first strip-shaped insert and the second strip-shaped insert are longitudinally slid in the limiting groove.

6. The inclined top slide structure according to claim 4, wherein The lower die base is provided with an accommodating hole for accommodating the base; one end of the elastic element abuts against the base, and the other end abuts against the inner wall of the accommodating hole.

7. A method for applying a ramped slide structure, applied to the ramped slide structure according to any one of claims 1-6, characterized in that, The method comprises: Before injection molding, the driving unit pushes the slider insert into the lower die base, there is a first movable gap between the slider insert and the insert limiting block, the elastic element is not deformed, and there is a second movable gap between the insert limiting block and the lower die base; the first strip-shaped insert, the second strip-shaped insert and the forming surface combine to form an injection molding processing surface; After injection molding, before opening the mold, the driving unit pulls the slider insert outward by a distance of the first movable gap, and the forming surface is separated from the product; at this time, the insert limiting block does not act under the elastic force of the elastic element, the first strip-shaped insert and the second strip-shaped insert are pulled to slide along the limiting groove under the action of the two inclined through holes, and the counterbore is removed; The driving unit continues to pull the slider insert outward by a distance of the second movable gap, so that the insert limiting block moves outward with the slider insert, and the first strip-shaped insert and the second strip-shaped insert are completely separated from the product.

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