Stepped sliding block guide demolding mechanism of injection mold

Abstract

A stepped sliding block guide demolding mechanism of an injection mold comprises a cavity frame and a core frame, a cavity insert is arranged in the cavity frame, a core insert is arranged in the core frame, the core insert and the cavity insert are matched to form a mold cavity, a product subjected to injection molding is arranged in the mold cavity, an inverted buckle is manufactured on the product, a sliding block is arranged on the core frame, the front end of the sliding block is matched with the inverted buckle, and the rear end of the sliding block is matched with the inverted buckle. The sliding block is driven by a stepped guide structure to be separated from the inverted buckle, the stepped guide structure comprises first stepped guide rails arranged on the two side walls of the sliding block and corresponding second stepped guide rails arranged below the cavity frame, and the first stepped guide rails and the second stepped guide rails are matched in a crossed mode. According to the scheme, longitudinal action is converted into transverse action through step matching, the transverse demolding stroke is shortened, the effect of sliding block retreating (outward sliding) is achieved, step type guide rail matching is achieved, the action is fast, the production period is effectively shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a stepped slider guiding demoulding mechanism for an injection mold, belonging to the field of injection molds. Background Art

[0002] Plastic products, such as automobile B-pillar exterior trim, are produced using injection molds. According to the product structure and appearance analysis, undercuts are made on the products. After the product is formed, the undercuts need to be demolded before the product can be ejected from the mold. Traditional technology generally uses a slider oblique sliding core pulling structure, and the slider is driven by a cylinder, which is set on the outer wall of the mold. The disadvantages are: 1. The slider is driven by a cylinder, and the slider has a large stroke. In one production cycle, the cylinder action is about 5 to 7 seconds slower than the mechanical action, and the production efficiency is low; 2. If it is a one-out-two or one-out-four mold, the structure in the middle will cause the mold row width or thickness to increase a lot, resulting in an increase in mold material cost investment; 3. The cylinder is set on the outer wall of the mold, which increases the overall volume of the mold, and requires a medium or large injection molding machine to process, which increases equipment investment. Summary of the invention

[0003] The utility model aims to overcome the shortcomings of the prior art and provide an injection mold stepped slider guide demoulding mechanism which adopts a stepped mechanical guide structure to effectively shorten the stroke, reduce the production cycle, improve production efficiency and reduce costs.

[0004] The technical scheme of the stepped slider guide demoulding mechanism of the injection mold of the utility model is as follows: it comprises a cavity frame and a core frame, the cavity frame is provided with a cavity insert, the core frame is provided with a core insert, the core insert and the cavity insert cooperate to form a mold cavity, the mold cavity has an injection molded product, the product is provided with an undercut, a slider is provided on the core frame, the front end of the slider cooperates with the undercut, the slider is driven by a stepped guide structure to be disengaged from the undercut, the stepped guide structure comprises a first stepped guide rail provided on both side walls of the slider, a corresponding second stepped guide rail is provided under the cavity frame, and the first stepped guide rail and the second stepped guide rail are cross-coordinated.

[0005] The utility model discloses a stepped slider-guided demoulding mechanism for an injection mold. When demoulding, the power of an injection molding machine drives a core frame and a cavity frame to open the mold. The cavity frame and a first stepped guide rail are stationary. The first stepped guide rail and the second stepped guide rail are cross-matched and passively stressed. During the mold opening process, the steps on the first stepped guide rail and the steps on the second stepped guide rail move in sequence from top to bottom. Through the step cooperation, the longitudinal movement is converted into a lateral movement, which drives the slider to slide outward, so that the front end of the slider is separated from the undercut, thereby achieving the purpose of demoulding. Its beneficial effects are: 1. Through the step-by-step coordination, the longitudinal action is converted into lateral action, shortening the lateral demoulding stroke to achieve the effect of slider withdrawal (outward sliding), the step-type guide rail coordination, fast action, effectively shortening the production cycle and improving production efficiency; 2. It can be applied to one-out-one, one-out-two and one-out-four multi-cavity molds, which can reduce the mold arrangement width or thickness and reduce the amount of mold material; 3. Compared with the traditional oil cylinder core pulling, the mold volume is reduced, making the mold suitable for the production of small and medium-sized injection molding machines, saving equipment investment costs.

[0006] The utility model provides a step-type slider guide demoulding mechanism for an injection mold. The first step-type guide rail and the second step-type guide rail are both provided with at least two groups of inclined blocks and inclined grooves arranged alternately. The inclined blocks on the first step-type guide rail or the second step-type guide rail cooperate with the inclined grooves on the second step-type guide rail or the first step-type guide rail. When the inclined blocks on the first step-type guide rail of the first group are about to separate from the inclined grooves on the second step-type guide rail, the inclined blocks and the inclined grooves of the second group begin to contact. Under the action of the mold opening action, the inclined blocks and the inclined grooves move in sequence to achieve the effect of the slider sliding outward. A pressure strip is provided on the core frame, and the pressure strip presses the first step-type guide rail. A guide groove is formed in the pressure strip, and the second step-type guide rail passes through the guide groove. When the first step-type guide rail is molded to a certain extent, it will be elastically deformed by the force, resulting in inaccurate stroke control. Therefore, a guide groove is provided on the pressure strip. Relying on the positioning of the guide groove, the first step-type guide rail will not be elastically deformed. A sliding guide groove is provided at the bottom of the slider, and a sliding guide bar is provided on the core frame. The sliding guide bar cooperates with the sliding guide groove to play a guiding role, so that the slider is smoother during the sliding process. A limit pin is provided at the bottom of the slider, and a limit clamp is provided on the core frame. The limit pin cooperates with the limit clamp to limit the sliding stroke of the slider, effectively improving the sliding accuracy of the slider and preventing accidents such as collision. A slider limit block is also provided on the core frame to prevent the entire slider from sliding out of the core frame. A slider lock module is provided on the cavity frame, and a slider locking groove is provided on the core frame. When closing the mold, the slider lock module cooperates with the outer wall of the slider by beveling and is inserted into the slider locking groove to prevent the slider from expanding the mold and ensure product quality. Wear-resistant plates are provided on the core frame and the slider. With the wear-resistant plates, the wear of the core frame and the slider can be reduced during the demolding process to ensure accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1It is a schematic diagram of the core side structure of the utility model;

[0008] Figure 2 It is a schematic diagram of the cavity side structure of the utility model;

[0009] Figure 3 It is a schematic diagram of the assembly relationship between the first stepped guide rail, the pressure strip, the second stepped guide rail and the slider of the utility model;

[0010] Figure 4 It is a schematic diagram of the stepped guide structure of the utility model;

[0011] Figure 5 It is a schematic cross-sectional view of the slide block and undercut matching of the injection mold of the utility model;

[0012] Figure 6 It is a schematic diagram of the first stepped guide rail of the utility model;

[0013] Figure 7 It is a schematic diagram of the second stepped guide rail of the utility model. DETAILED DESCRIPTION

[0014] The utility model relates to a stepped slider guide demoulding mechanism for an injection mold, such as Figure 1 — Figure 7As shown, it includes a cavity frame 1 and a core frame 2, a cavity insert 3 is arranged in the cavity frame, a core insert 4 is arranged in the core frame, the core insert 4 cooperates with the cavity insert 3 to form a mold cavity, an injection-molded product 5 is arranged in the mold cavity, an undercut 6 is formed on the product 5, a slider 7 is arranged on the core frame 2, the front end of the slider 7 cooperates with the undercut 6, the slider 7 is driven by a stepped guide structure to disengage from the undercut 6, the stepped guide structure includes a first stepped guide rail 8 arranged on both side walls of the slider 7, a corresponding second stepped guide rail 9 is arranged under the cavity frame 1, and the first stepped guide rail 8 and the second stepped guide rail 9 are cross-matched. During demolding, the power of the injection molding machine drives the core frame 2 and the cavity frame 1 to open the mold, the cavity frame 1 and the first stepped guide rail 8 remain stationary, the first stepped guide rail 8 and the second stepped guide rail 9 cross-coordinate and passively bear force. During the mold opening process, the steps on the first stepped guide rail 8 and the steps on the second stepped guide rail 9 move from top to bottom in sequence, and through the step coordination, the longitudinal movement is converted into a lateral movement, driving the slider 7 to slide outward, so that the front end of the slider 7 is separated from the undercut 6, and the purpose of demolding is achieved. Its beneficial effects are: 1. Through step coordination, the longitudinal action is converted into lateral action, the lateral demoulding stroke is shortened, and the effect of the slider exiting (sliding outward) is achieved. The step rail coordination has fast action, effectively shortens the production cycle, and improves production efficiency; 2. It can be applied to one-out-one, one-out-two and one-out-four one-mold multi-cavity molds, which can reduce the mold row width or thickness and reduce the amount of mold material; 3. Compared with the traditional oil cylinder core pulling, the mold volume is reduced, making the mold suitable for the production of small and medium-sized injection molding machines, saving equipment investment costs. The first stepped guide rail 8 and the second stepped guide rail 9 are both provided with at least two sets of inclined blocks 10 and inclined grooves 11 arranged alternately, and the inclined blocks 10 on the first stepped guide rail 8 or the second stepped guide rail 9 are matched with the inclined grooves 11 of the second stepped guide rail 9 or the first stepped guide rail 8. When the inclined block 10 on the first stepped guide rail 8 of the first group is about to separate from the inclined groove on the second stepped guide rail 9, the inclined block of the second group begins to contact the inclined groove. Under the action of the mold opening action, the inclined block and the inclined groove move in sequence to achieve the effect of the slider sliding outward. The core frame 2 is provided with a pressure strip 12, which presses the first stepped guide rail 8. The pressure strip 12 is provided with a guide groove 13. The second stepped guide rail 9 passes through the guide groove 13. When the first stepped guide rail is molded to a certain extent, it will be elastically deformed by force, resulting in inaccurate stroke control. Therefore, a guide groove is provided on the pressure strip. Relying on the positioning of the guide groove, the first stepped guide rail will not be elastically deformed. A sliding guide groove 15 is provided at the bottom of the slider 7, and a sliding guide bar 16 is provided on the core frame 2. The sliding guide bar 16 cooperates with the sliding guide groove 15 to play a guiding role, so that the slider is smoother during the sliding process. A limit pin 17 is arranged at the bottom of the slider 7, and a limit clamp 18 is arranged on the core frame 2. The limit pin 17 cooperates with the limit clamp 18 to limit the sliding stroke of the slider, effectively improving the sliding accuracy of the slider and preventing accidents such as collision.The core frame 2 is also provided with a slider limit block 19 to prevent the entire slider from sliding out of the core frame. The cavity frame 1 is provided with a slider lock module 20, and the core frame 2 is provided with a slider locking groove 21. When closing the mold, the slider lock module 20 is matched with the outer wall of the slider 7 by bevel cutting, and is inserted into the slider locking groove 21 to prevent the slider from expanding the mold and ensure product quality. The core frame 2 and the slider 7 are both provided with a wear-resistant plate 22. With the wear-resistant plate, the wear of the core frame and the slider can be reduced during the demoulding process to ensure accuracy.

Claims

1. A stepped slider-guided demoulding mechanism for an injection mold, comprising a cavity frame (1) and a core frame (2), wherein a cavity insert (3) is arranged in the cavity frame, and a core insert (4) is arranged in the core frame, wherein the core insert (4) cooperates with the cavity insert (3) to form a mold cavity, wherein an injection molded product (5) is arranged in the mold cavity, and an undercut (6) is formed on the product (5), wherein the characteristics are as follows: A slider (7) is arranged on the core frame (2), the front end of the slider (7) cooperates with the undercut (6), the slider (7) is driven by a stepped guide structure to disengage from the undercut (6), the stepped guide structure comprising a first stepped guide rail (8) arranged on both side walls of the slider (7), a corresponding second stepped guide rail (9) arranged under the cavity frame (1), the first stepped guide rail (8) and the second stepped guide rail (9) cross-cooperating with each other.

2. The injection mold step-type slider guide demoulding mechanism according to claim 1, characterized in that The first stepped guide rail (8) and the second stepped guide rail (9) are both provided with at least two groups of inclined blocks (10) and inclined grooves (11) arranged alternately, and the inclined blocks (10) on the first stepped guide rail (8) or the second stepped guide rail (9) cooperate with the inclined grooves (11) of the second stepped guide rail (9) or the first stepped guide rail (8).

3. The injection mold step-type slider guide demoulding mechanism according to claim 1, characterized in that A pressure strip (12) is arranged on the core frame (2), the pressure strip (12) presses the first stepped guide rail (8), a guide groove (13) is formed in the pressure strip (12), and the second stepped guide rail (9) passes through the guide groove (13).

4. The injection mold step-type slider guide demoulding mechanism according to claim 1, characterized in that A sliding guide groove (15) is arranged at the bottom of the sliding block (7), and a sliding guide bar (16) is arranged on the core frame (2), and the sliding guide bar (16) matches the sliding guide groove (15).

5. The injection mold step-type slider guide demoulding mechanism according to claim 1, characterized in that A limit pin (17) is arranged at the bottom of the slide block (7), and a limit clamp (18) is arranged on the core frame (2), and the limit pin (17) cooperates with the limit clamp (18).

6. The injection mold step-type slider guide demoulding mechanism according to claim 1, characterized in that A slider limit block (19) is also provided on the core frame (2).

7. The injection mold step-type slider guide demoulding mechanism according to claim 1, characterized in that The cavity frame (1) is provided with a slider locking module (20), the core frame (2) is provided with a slider locking groove (21), and the slider locking module (20) is matched with the outer wall of the slider (7) by bevel cutting and is inserted into the slider locking groove (21).

8. The injection mold step-type slider guide demoulding mechanism according to claim 1, characterized in that The core frame (2) and the slider (7) are both provided with wear-resistant plates (22).

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