Forced stripping mechanism for inverted buckle of injection molded part

Abstract

The utility model discloses an injection molding part reverse buckle forced demoulding mechanism which is characterized in that the forced demoulding mechanism comprises a reverse buckle forced demoulding rod (1), the bottom end of the reverse buckle forced demoulding rod (1) is connected with an ejector rod plate (2), the reverse buckle forced demoulding rod (1) is movably connected in a guide groove formed in a movable mold plate (3), meanwhile, the reverse buckle forced demoulding rod (1) is further provided with a limiting shoulder part (4), and the limiting shoulder part (4) is connected with the ejector rod plate (2). The limiting shoulder part (4) is located below the movable mold plate (3), the outline of the limiting shoulder part (4) is larger than the cross section of the guide groove, the upper portion of the back-off forced demolding rod (1) is movably connected into the movable mold core (5), and in the mold closing state, the top end of the back-off forced demolding rod (1) enters a mold cavity and occupies a space; the top end of the ejector rod (6) penetrates through guide grooves formed in the movable mold plate (3) and the movable mold core (5) and is located below the cavity.

Description

Technical Field

[0001] The utility model relates to the field of injection molding, in particular to an undercut forced release mechanism for injection molded parts. Background Art

[0002] When using injection molds to produce plastic products, some plastic products have undercut structures. The conventional design method is to set a slider core-pulling mechanism at the undercut structure. The slider can slide with the mold opening action and be pulled out in a direction at a certain angle to the mold opening direction. However, in this way, the slider core-pulling mechanism needs to occupy a certain space in the mold, and it will also increase the overall cost of the mold.

[0003] For some undercut structures with small deformation, forced demolding can be used directly. When the traditional forced demolding mechanism is working, due to structural limitations, it will start forced demolding before the product and the mold core are separated. This will result in the undercut part of the workpiece having no space for elastic deformation. During the forced demolding process, the undercut part is squeezed between the inner wall of the cavity and the insert at the undercut structure, which will cause burrs on its surface, affecting the product quality; in severe cases, it may even cause the undercut structure to break. Once the broken part remains in the mold, it needs to be thoroughly cleaned after the mold is opened, seriously affecting the production progress.

[0004] Therefore, a method or device capable of solving the above problems is now needed. Summary of the invention

[0005] The utility model aims to solve the above-mentioned deficiencies in the prior art and proposes an undercut forced stripping mechanism which has a simple structure, ingenious design, reasonable layout and can ensure product quality during the undercut forced stripping process.

[0006] The technical solution of the utility model is: an undercut strong release mechanism for injection molded parts, characterized in that: the strong release mechanism comprises an undercut strong release rod 1, the bottom end of the undercut strong release rod 1 is connected to the ejector plate 2 through a hanging platform 8, the undercut strong release rod 1 is movably connected in a guide groove provided in a movable template 3, and a limiting shoulder 4 is also arranged on the undercut strong release rod 1, the limiting shoulder 4 is located below the movable template 3, and the contour of the limiting shoulder 4 is larger than the cross-section of the guide groove, the upper part of the undercut strong release rod 1 is movably connected in the movable mold core 5, and in the mold closing state, the top end of the undercut strong release rod 1 enters the mold cavity and forms a placeholder,

[0007] The ejector plate 2 is also provided with an ejector 6, the top end of which passes through guide grooves provided on the movable mold plate 3 and the movable mold core 5, and is located below the cavity.

[0008] Compared with the prior art, the utility model has the following advantages:

[0009] This structural form of the injection molded part undercut forced release mechanism has a simple structure, ingenious design, and reasonable layout. It is designed to solve the problems existing in the traditional undercut forced release mechanism, and has a special structure, which can eject the product from the cavity, and then forcibly separate the product from the undercut forced release rod, thereby realizing the forced release operation at the undercut structure. This structure that can realize step-by-step and sequential actions can leave enough elastic deformation space for the product forced release action, avoiding the situation where the product is forced to be released between the inner wall of the cavity and the undercut insert, thereby ensuring that the surface of the product will not produce burrs due to friction, and ensuring the quality of the product. At the same time, the manufacturing process of this undercut forced release mechanism is simple and the manufacturing cost is low, so it can be said that it has many advantages, and is particularly suitable for promotion and application in this field, and its market prospects are very broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a partial schematic diagram of the undercut structure on the workpiece to be processed in the embodiment of the utility model.

[0011] Figure 2 It is a structural schematic diagram of an inverted strong release rod in an embodiment of the utility model.

[0012] Figure 3 It is a partial schematic diagram of the end of the inverted strong release rod in the embodiment of the utility model.

[0013] Figure 4-6 It is a schematic diagram of the working process of an embodiment of the utility model. DETAILED DESCRIPTION

[0014] The specific implementation of the present utility model will be described below in conjunction with the accompanying drawings. Figures 1 to 6 As shown: an undercut strong release mechanism for injection molded parts, which includes an undercut strong release rod 1, the bottom end of the undercut strong release rod 1 is connected to the ejector plate 2 through a hanging platform 8, the undercut strong release rod 1 is movably connected in a guide groove opened in a movable template 3, and a limiting shoulder 4 is also arranged on the undercut strong release rod 1, the limiting shoulder 4 is located below the movable template 3, and the contour of the limiting shoulder 4 is larger than the cross-section of the guide groove, the upper part of the undercut strong release rod 1 is movably connected in the movable mold core 5, and in the mold closing state, the top end of the undercut strong release rod 1 enters the cavity and forms a placeholder,

[0015] The ejector plate 2 is also provided with an ejector 6, the top end of which passes through guide grooves provided on the movable mold plate 3 and the movable mold core 5, and is located below the cavity.

[0016] The working process of the undercut strong release mechanism for injection molded parts of the utility model embodiment is as follows: in the mold closing state, the top end of the undercut strong release rod 1 is located inside the cavity and occupies a position, the molding machine injects molten material into the mold, the material enters the cavity and cools to form a product 7, and the part on the product 7 that matches the top end of the undercut strong release rod 1 is formed as shown in the figure. Figure 1 The undercut portion shown;

[0017] The mold is opened, the fixed mold core and the movable mold core 5 are separated, and the product 7 is exposed to the air. Then the molding machine drives the ejector plate 2 in the mold upward, and the ejector plate 2 drives the undercut strong ejector rod 1 and the ejector rod 6 to move upward at the same time. Since the undercut strong ejector rod 1 and the ejector rod 6 are relatively immobile during this process, they will jointly eject the product 7 from the cavity on the movable mold core 5, that is, realize the demoulding action of the product 7;

[0018] The ejector plate 2 continues to move upward, and when the limiting shoulder 4 on the undercut strong stripping rod 1 contacts the bottom end surface of the movable template 3, since the contour of the limiting shoulder 4 is larger than the cross-section of the guide groove, the undercut strong stripping rod 1 cannot continue to move upward, while the ejector plate 2 continues to move (in this process, the undercut strong stripping rod 1 and the ejector plate 2 move relative to each other), driving the ejector 6 to continue to move upward against the product 7, that is, in this process, the undercut strong stripping rod 1 stops moving, and the product 7 moves upward, and the relative movement between the two allows the top end of the undercut strong stripping rod 1 to be forcibly pulled out from the product 7, thereby realizing the action of forced demoulding;

[0019] When the mold is closed, the ejector plate 2 drives the ejector 6 downward. When the bottom end surface of the ejector plate 2 contacts the hanging platform 8, it will pull the undercut strong release rod 1 downward. When the ejector plate 2 moves to the initial position, the ejector 6 and the undercut strong release rod 1 also return to the initial position, waiting for the next ejection and strong release operation.

[0020] This forced release mechanism first separates the product 7 from the movable mold core 5, and then performs the forced release action, so that the undercut part of the product has space for elastic deformation during the forced release, thereby avoiding the situation where burrs are forcibly pulled out or the product surface is pulled apart during the forced release.

Claims

1. A mechanism for removing the molded part by buckling, characterized in that: The forced release mechanism comprises an inverted forced release rod (1), the bottom end of which is connected to a push rod plate (2) via a hanging platform (8), the inverted forced release rod (1) is movably connected to a guide groove provided in a movable mold plate (3), and a limiting shoulder (4) is also provided on the inverted forced release rod (1), the limiting shoulder (4) is located below the movable mold plate (3), and the contour of the limiting shoulder (4) is larger than the cross section of the guide groove, the upper part of the inverted forced release rod (1) is movably connected to the movable mold core (5), and in a mold closing state, the top end of the inverted forced release rod (1) enters the mold cavity and forms a placeholder. The ejector plate (2) is also provided with an ejector rod (6), the top end of which passes through guide grooves provided on the movable mold plate (3) and the movable mold core (5) and is located below the mold cavity.

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