Mould core pulling and demoulding mechanism, working method and casting mould

Abstract

The present invention provides a mold core-pulling and demolding mechanism, a working method, and a casting mold, comprising: a rear mold sleeve, a cylinder push block assembly, a cylinder assembly, a movable mold large core fixing plate, a push rod fixing plate, a rear mold large core, an ejector pin, and a movable mold core; the rear mold sleeve is fixedly mounted on the movable mold large core fixing plate, the movable mold core is mounted on the rear mold sleeve on the side facing away from the movable mold large core fixing plate, the rear mold sleeve, and the movable mold core at one end, and the rear mold large core and the ejector at the other end are fixedly mounted on the push rod fixing plate; the output end of the cylinder assembly is connected to the cylinder push block assembly, which is connected to the rear mold sleeve, and the cylinder assembly, via the cylinder push block assembly, pushes the rear mold sleeve along the side facing away from the push rod fixing plate. This device can solve the problems of ejector pin bending and product dimensional deformation during demolding.

Description

Technical Field

[0001] The present invention relates to the field of casting mold structures, in particular to a mold core pulling and demoulding mechanism, a working method and a casting mold. Background Art

[0002] In the casting process, especially in the die-casting of automotive parts, complex products requiring large core structures are typically released using ejector pins. This can easily lead to numerous problems during production, including product dimensional deformation, ejector pin bending, and substandard product dimensions. This is primarily due to the slender nature of the ejector pin, typically measuring approximately 6-10mm in diameter and spanning approximately 300mm across the entire movable mold. When the ejection force approaches the clamping force, and during frequent production operations, the ejector pin can easily bend and deform. Therefore, a demolding device that prevents ejector pin bending and product dimensional deformation is needed.

[0003] Patent document CN112454837A relates to a core-pulling and demolding mechanism, including a slider, an inclined guide column for driving the slider, and an inclined top whose front end extends from a limiting hole on the front end surface of the slider and has a forming column for forming an undercut. It also includes a sub-slider that can limit the slider in the horizontal direction and a locking block for simultaneously fastening the slider and the sub-slider. The inclined top movably passes through the slider and its end is fixedly connected to the sub-slider through a fixed connection portion. A protrusion extending in the horizontal direction is provided on the front end surface of the inclined top.

[0004] Patent document CN108247962A discloses a strong pulling core pulling demoulding device for injection molds, comprising a strong pulling slider, a guide rail, a spring, a limit block and a delayed pull rod. The strong pulling slider adopted by the present invention is embedded in the lower side wall of the core, the strong pulling slider slides and engages on the guide rail, the limit block is located to the right of the strong pulling slider, the limit block is fixed to the movable mold carrier plate, the spring is located between the strong pulling slider and the limit block, the delayed pull rod slides in the delayed pulling groove provided by the transverse slider, and the left end of the delayed pull rod is fixedly connected to the strong pulling slider; during operation, the transverse slider separates from the product, the spring keeps the strong pulling slider in place, and when the left end of the delayed pulling groove touches the hook head, the transverse slider drives the strong pulling slider to pull the lower edge of the product to the right, forcing the inner convex undercut of the product to separate from the inner concave cavity of the core, thereby realizing the demoulding of a groove-shaped product with symmetrical inner convex undercuts, outer concave undercuts and narrow inner grooves.

[0005] Currently, existing technologies have failed to provide a solution to the problems of ejector pin bending and product size deformation in the demoulding device. Summary of the Invention

[0006] In view of the defects in the prior art, the purpose of the present invention is to provide a mold core-pulling and demoulding mechanism, a working method and a casting mold.

[0007] According to the present invention, a mold core pulling and demoulding mechanism includes: a rear mold sleeve, a cylinder push block group, a cylinder group, a movable mold large core fixing plate, a push rod fixing plate, a rear mold large core, an ejector pin, and a movable mold core;

[0008] The rear mold sleeve is connected to the movable mold large core fixing plate, the movable mold core is installed on the side of the rear mold sleeve facing away from the movable mold large core fixing plate, the rear mold sleeve and the movable mold core, and the other ends of the rear mold large core and the ejector are fixedly mounted on the push rod fixing plate;

[0009] The output end of the oil cylinder group is connected to the oil cylinder push block group, and the oil cylinder push block group is connected to the rear mold sleeve. The oil cylinder group pushes the rear mold sleeve to move along the side facing away from the push rod fixing plate through the oil cylinder push block group.

[0010] Preferably, the cylinder group comprises: a first cylinder and a second cylinder;

[0011] The first oil cylinder and the second oil cylinder are fixedly mounted on the movable mold large core fixing plate.

[0012] The oil cylinder push block group includes: a first oil cylinder push block and a second oil cylinder push block;

[0013] The output end of the first oil cylinder is connected to the first oil cylinder push block, the output end of the second oil cylinder is connected to the second oil cylinder push block, and the first oil cylinder push block and the second oil cylinder push block are fixedly connected to the rear mold plate.

[0014] Preferably, the position of the oil cylinder group relative to the push rod fixing plate remains unchanged.

[0015] Preferably, rear mold support plates are installed on both sides of the push rod fixing plate, and the push rod fixing plate is supported on the movable mold large core fixing plate through the rear mold support plates.

[0016] Preferably, a front mold sleeve is provided on the side of the rear mold sleeve facing away from the movable mold large core fixed plate, and a front mold core is installed on the side of the front mold sleeve facing the rear mold sleeve.

[0017] Preferably, a front mold core is installed between the front mold core and the movable mold core.

[0018] Preferably, side sliders are installed between the front mold sleeve and the rear mold sleeve.

[0019] Preferably, the axis direction of the rear mold large core and the ejector pin is parallel to the moving direction of the cylinder group driving the cylinder push block group.

[0020] Preferably, the push rod fixing plate is connected to the piston rod of the die-casting equipment, and the piston rod of the die-casting equipment can drive the push rod fixing plate to move.

[0021] Preferably, a working method of the mold core-pulling and demoulding mechanism comprises the following steps:

[0022] Step S1: the rear mold plate drives the push rod fixing plate to move in a direction away from the front mold plate and separate from the front mold plate;

[0023] Step S2, the oil cylinder group works and drives the oil cylinder push block group to move in a direction away from the push rod fixing plate;

[0024] Step S3, the oil cylinder push block assembly drives the rear mold sleeve plate to separate from the push rod fixing plate, and at the same time, the rear mold large core and ejector pin fixedly connected to the push rod fixing plate are separated from the rear mold sleeve plate;

[0025] In step S4, the push rod fixing plate drives the rear mold large core and the ejector pin to separate from the movable mold large core fixing plate under the action of the piston rod of the die-casting equipment itself.

[0026] Preferably, a casting mold adopts the mold core-pulling and demoulding mechanism.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. This device can solve the problems of ejector pin bending and product size deformation during demoulding;

[0029] 2. This device has a simple structure, strong versatility, simple on-site installation, and improves product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0031] Figure 1 It is a structural diagram of the mold core pulling and demoulding mechanism;

[0032] As shown in the figure:

[0033] DETAILED DESCRIPTION

[0034] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0035] Example 1

[0036] like Figure 1 As shown, this embodiment can be used for casting molds in the field of die-casting of automotive parts, including: a rear mold sleeve 5, a cylinder push block group, a cylinder group, a movable mold large core fixing plate 8, a push rod fixing plate 9, a rear mold large core 10, an ejector pin 11, and a movable mold core 15; the rear mold sleeve 5 abuts against the movable mold large core fixing plate 8, and the movable mold core 15 is installed on the side of the rear mold sleeve 5 facing away from the movable mold large core fixing plate 8. One end of the rear mold large core 10 and the ejector pin 11 pass through the movable mold large core fixing plate 8, the rear mold sleeve 5, and the movable mold core 15, and the other end of the rear mold large core 10 and the ejector pin 11 is fixedly mounted on the push rod fixing plate 9. The output end of the cylinder group is connected to the cylinder push block group, and the cylinder push block group is connected to the rear mold sleeve 5; the cylinder group includes: a first cylinder 7 and a second cylinder 13; the first cylinder 7 and the second cylinder 13 are fixedly mounted on the movable mold large core fixing plate 8. The cylinder push block group includes: a first cylinder push block 6 and a second cylinder push block 14. The output end of the first cylinder 7 is connected to the first cylinder push block 6, and the output end of the second cylinder 13 is connected to the second cylinder push block 14. The first cylinder push block 6 and the second cylinder push block 14 are fixedly connected to the rear mold plate 5.

[0037] The cylinder assembly remains in place relative to the push rod fixing plate 9. Rear mold support plates 12 are installed on both sides of the push rod fixing plate 9, supporting the push rod fixing plate 9 on the movable mold large core fixing plate 8 via the rear mold support plates 12. The front mold sleeve 1 is installed on the side of the rear mold sleeve 5 facing away from the movable mold large core fixing plate 8. Side slides 4 are installed between the front mold sleeve 1 and the rear mold sleeve 5. The front mold core 2 is installed on the side of the front mold sleeve 1 facing the rear mold sleeve 5. The front mold core 3 is installed between the front mold core 2 and the movable mold core 15. The axis of the rear mold large core 10 and ejector pin 11 are parallel to the direction of movement of the cylinder block assembly driven by the cylinder assembly.

[0038] Working principle:

[0039] For products with high holding forces, particularly when structural limitations prevent the use of sufficient ejector pins and their diameters, conventional ejection methods often result in product failure, product deformation, or pin bending and failure. This structure decomposes the product holding force by sequentially separating the front mold plate 1, the rear mold plate 5, and the movable mold's large core fixing plate 8. During the separation and extraction process, the remaining unextracted parts remain within the mold, effectively preventing product deformation.

[0040] Example 2

[0041] Example 2 is a preferred example of Example 1.

[0042] like Figure 1As shown, this embodiment is applied to die-casting equipment with a large core structure, generally when the core height and diameter ratio is greater than 1 and the draft angle is less than 3°, including a front mold sleeve 1, a front mold core 2, a front mold core 3, a side slide 4, a rear mold sleeve 5, a first oil cylinder push block 6, a first oil cylinder 7, a movable mold large core fixing plate 8, a push rod fixing plate 9, a rear mold large core 10, an ejector pin 11, a rear mold support plate 12, a second oil cylinder 13, a second oil cylinder push block 14 and a movable mold core 15;

[0043] The rear mold large core 10 is fixed to the push rod fixing plate 9 and passes through the movable mold large core fixing plate 8. The rear mold large core 10 can move together with the push rod fixing plate 9. The first oil cylinder 7 and the second oil cylinder 13 are fixed to the movable mold large core fixing plate 8. The first oil cylinder push block 6 and the second oil cylinder push block 14 are respectively installed on the first oil cylinder 7 and the second oil cylinder 13. The first oil cylinder push block 6 and the second oil cylinder push block 14 are connected to the rear mold sleeve plate 5. The operation of the first oil cylinder 7 and the second oil cylinder 13 can drive the rear mold sleeve plate 5 to move.

[0044] The working method of this embodiment includes the following steps: Step S1, the rear mold sleeve plate 5 drives the push rod fixing plate 9 to move in the direction away from the front mold sleeve plate 1 and separate from the front mold sleeve plate 1; Step S2, the cylinder group works and drives the cylinder push block group to move in the direction away from the push rod fixing plate 9; Step S3, the cylinder push block group drives the rear mold sleeve plate 5 to separate from the push rod fixing plate 9, and at the same time, the rear mold large core 10 and the ejector pin 11 fixedly connected to the push rod fixing plate 9 are separated from the rear mold sleeve plate 5; Step S4, the push rod fixing plate 9 drives the rear mold large core 10 and the ejector pin 11 to separate from the movable mold large core fixing plate 8.

[0045] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0046] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A working method of a mold core-pulling and demoulding mechanism, characterized in that: A mold core-pulling and demoulding mechanism is used, comprising: a rear mold sleeve (5), a cylinder push block group, a cylinder group, a movable mold large core fixing plate (8), a push rod fixing plate (9), a rear mold large core (10), an ejector pin (11), and a movable mold core (15); The rear mold sleeve (5) is connected to the movable mold large core fixing plate (8), and the movable mold core (15) is installed on the side of the rear mold sleeve (5) facing away from the movable mold large core fixing plate (8). One end of the rear mold large core (10) and the ejector pin (11) passes through the movable mold large core fixing plate (8), the rear mold sleeve (5) and the movable mold core (15), and the other end of the rear mold large core (10) and the ejector pin (11) is fixedly installed on the push rod fixing plate (9); The output end of the oil cylinder group is connected to the oil cylinder push block group, and the oil cylinder push block group is connected to the rear mold sleeve (5). The oil cylinder group pushes the rear mold sleeve (5) to move along the side facing away from the push rod fixing plate (9) through the oil cylinder push block group. The rear mold sleeve (5) is provided with a front mold sleeve (1) on the side facing away from the movable mold large core fixing plate (8), and the front mold sleeve (1) is provided with a front mold core (2) facing the side of the rear mold sleeve (5). The axis directions of the rear mold large core (10) and the ejector pin (11) are parallel to the direction in which the oil cylinder group drives the oil cylinder push block group to move; The working method includes the following steps: Step S1, the rear mold sleeve (5) drives the movable mold large core fixing plate (8) and the push rod fixing plate (9) to move in a direction away from the front mold sleeve (1) and separate from the front mold sleeve (1); Step S2, the oil cylinder group drives the oil cylinder push block group to move in a direction away from the push rod fixing plate (9); Step S3, the oil cylinder push block assembly drives the rear mold sleeve (5) to separate from the push rod fixing plate (9), and at the same time, the rear mold large core (10) and the ejector pin (11) fixedly connected to the push rod fixing plate (9) are separated from the rear mold sleeve (5); In step S4, the push rod fixing plate (9) drives the rear mold large core (10) and the ejector pin (11) to separate from the movable mold large core fixing plate (8).

2. The working method of the mold core-pulling and demoulding mechanism according to claim 1, characterized in that: The oil cylinder group comprises: a first oil cylinder (7) and a second oil cylinder (13); The first oil cylinder (7) and the second oil cylinder (13) are fixedly mounted on the movable mold large core fixing plate (8).

3. The working method of the mold core-pulling and demoulding mechanism according to claim 2, characterized in that: The oil cylinder push block group comprises: a first oil cylinder push block (6) and a second oil cylinder push block (14); The output end of the first oil cylinder (7) is connected to the first oil cylinder push block (6), the output end of the second oil cylinder (13) is connected to the second oil cylinder push block (14), and the first oil cylinder push block (6) and the second oil cylinder push block (14) are fixedly connected to the rear mold sleeve (5).

4. The working method of the mold core-pulling and demoulding mechanism according to claim 1, characterized in that: Rear mold support plates (12) are installed on both sides of the push rod fixing plate (9), and the push rod fixing plate (9) is supported on the movable mold large core fixing plate (8) through the rear mold support plates (12).

5. The working method of the mold core-pulling and demoulding mechanism according to claim 1, characterized in that: A front mold core (3) is installed between the front mold core (2) and the movable mold core (15).

6. The working method of the mold core-pulling and demoulding mechanism according to claim 1, characterized in that: A side slide block (4) is installed between the front mold sleeve (1) and the rear mold sleeve (5).

7. A casting mold, characterized in that: The casting mold adopts the working method of the mold core-pulling and demoulding mechanism according to any one of claims 1 to 6.

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