Secondary core-pulling mold

Abstract

The utility model discloses a secondary core-pulling mould which comprises a fixed mould part and a movable mould part which are matched with each other, the fixed mould part comprises an upper taking and attaching plate, a fixed mould plate is arranged below the upper taking and attaching plate, a fixed mould core is arranged in the fixed mould plate, the movable mould part comprises a lower taking and attaching plate, and square iron, a first pulling plate and a movable mould plate are sequentially arranged above the lower taking and attaching plate. A fixed mold core is arranged in the fixed mold plate, a movable mold core is arranged in the movable mold plate, and during mold closing, the fixed mold core and the movable mold core jointly define a mold cavity, and is characterized in that a secondary pre-pulling insert core acting block is arranged in the pre-pulling insert core acting block, and a cylindrical primary pre-pulling insert core is movably connected in the secondary pre-pulling insert core acting block; a cylindrical secondary pre-pulling insert core and a spring are movably sleeved outside the primary pre-pulling insert core, the spring is positioned below the secondary pre-pulling insert core, a limiting ring is arranged at the bottom end of the secondary pre-pulling insert core, and a top opening of a secondary pre-pulling insert core acting block is smaller than the outer contour of the limiting ring.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to a secondary core-pulling mold. Background Art

[0002] The injection molding process is a low-cost production method suitable for mass production. The process is to use a molding machine to inject molten material into the cavity of the mold. After the material cools, it forms a workpiece that matches the shape of the cavity.

[0003] When using molds for injection molding, you may encounter the following problems: Figure 1 The workpiece shown in the figure is characterized in that two layers of annular protrusions are arranged at the center thereof, and an undercut structure is arranged at the edge of the protrusion. In order to realize the undercut action in the circumferential direction in the traditional mold, multiple sliders need to be arranged, and the inserts at the ends of these sliders can be spliced ​​into a complete circle.

[0004] However, this slider core-pulling structure is only applicable to the case of a single-layer circular protrusion. For a double-layer circular protrusion that needs to be stripped, if the above method is still used to achieve stripping, the structure of the mold will become extremely complicated. Especially for small workpieces, it is almost impossible to design a stripping mechanism that can achieve a double-layer annular stripping structure.

[0005] Therefore, a method or device capable of solving the above problems is now needed. Summary of the invention

[0006] The utility model is to solve the above-mentioned deficiencies in the prior art and propose a device with simple structure, ingenious design and reasonable layout.

[0007] The technical solution of the utility model is: a secondary core-pulling mold, including a fixed mold part and a movable mold part that match each other, the fixed mold part includes an upper take-up plate 1, a fixed mold plate 2 is arranged below the upper take-up plate 1, and a fixed mold core 3 is arranged in the fixed mold plate 2, the movable mold part includes a lower take-up plate 4, and a square iron 5, a first pull-out plate 6 and a movable mold plate 7 are arranged above the lower take-up plate 4 in sequence, and a movable mold core 8 is arranged in the movable mold plate 7. When the mold is closed, the fixed mold core 3 and the movable mold core 8 are enclosed together to form a cavity. , characterized in that: a secondary first pull-in sub-action block 9 is arranged inside the first pull-out plate 6, a cylindrical first first pull-in sub-10 is movably connected inside the secondary first pull-in sub-action block 9, a cylindrical secondary first pull-in sub-11 and a spring 12 are movably sleeved outside the first first pull-in sub-10, the spring 12 is located below the secondary first pull-in sub-11, a limiting ring 13 is arranged at the bottom end of the secondary first pull-in sub-11, and the top opening of the secondary first pull-in sub-action block 9 is smaller than the outer contour of the limiting ring 13,

[0008] A clamping device 14 is provided between the fixed die plate 2 and the movable die plate 7, and a limiting bolt 15 is provided between the movable die plate 7 and the first drawing plate 6.

[0009] In the mold closing state, the top ends of the first pull-in element 10 and the second pull-in element 11 are both located in the mold cavity to occupy positions.

[0010] Compared with the prior art, the utility model has the following advantages:

[0011] The secondary core-pulling mold of this structural form has a simple structure, ingenious design and reasonable layout. It is designed to solve the problems encountered when using traditional molds to prepare a workpiece with a double-layer annular undercut structure. A special structure is designed. It designs a set of double-layer structure and the insert structure that can move relative to each other between the two layers. Through the setting of the clamping device and the limit bolt, the extraction sequence of the two insert structures is controlled, so as to realize the secondary core-pulling and demolding action of the inner layer insert being pulled out first and then the outer layer insert being pulled out. It does not need to set up multiple side core-pulling mechanisms in different directions. Both layers of inserts can move along the mold opening direction. The overall structure is simpler, and the demolding action of the double-layer annular undercut structure can be smoothly realized. In addition, its manufacturing process is simple and the manufacturing cost is low. Therefore, it can be said that it has many advantages and is particularly suitable for promotion and application in this field. Its market prospect is very broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of a workpiece targeted by an embodiment of the utility model.

[0013] Figure 2 It is a structural schematic diagram of an embodiment of the utility model (working state one).

[0014] Figure 3 It is a structural schematic diagram of an embodiment of the utility model (working state two).

[0015] Figure 4 It is a structural schematic diagram of an embodiment of the utility model (working state three). DETAILED DESCRIPTION

[0016] The specific implementation of the present utility model will be described below in conjunction with the accompanying drawings. Figures 1 to 4As shown: a secondary core-pulling mold, including a fixed mold part and a movable mold part that match each other, the fixed mold part includes an upper take-up plate 1, a fixed mold plate 2 is arranged below the upper take-up plate 1, and a fixed mold core 3 is arranged in the fixed mold plate 2, the movable mold part includes a lower take-up plate 4, and a square iron 5, a first pull-out plate 6 and a movable mold plate 7 are arranged above the lower take-up plate 4 in sequence, and a movable mold core 8 is arranged in the movable mold plate 7. When the mold is closed, the fixed mold core 3 and the movable mold core 8 are surrounded together to form a cavity. A secondary first pull-in sub-action block 9 is arranged in the first pull-out plate 6, a cylindrical first pull-in sub-action block 9 is movably connected with a cylindrical first pull-in sub-action block 10, a cylindrical secondary first pull-in sub-action block 11 and a spring 12 are movably sleeved outside the first pull-in sub-action block 10, the spring 12 is located below the secondary first pull-in sub-action block 11, a limiting ring 13 is arranged at the bottom end of the secondary first pull-in sub-action block 9, and the top opening of the secondary first pull-in sub-action block 9 is smaller than the outer contour of the limiting ring 13.

[0017] A clamping device 14 is provided between the fixed die plate 2 and the movable die plate 7, and a limiting bolt 15 is provided between the movable die plate 7 and the first drawing plate 6.

[0018] In the mold closing state, the top ends of the first pull-in element 10 and the second pull-in element 11 are both located in the mold cavity to occupy positions.

[0019] The working process of the secondary core-pulling mold of the utility model embodiment is as follows: Figure 2 As shown in the figure, the top ends of the first pull-in son 10 and the second pull-in son 11 are both located in the cavity and occupy positions, and the molding machine injects molten material into the cavity. After the material fills the cavity, it is cooled and molded to form a workpiece 16. The ends of the two first pull-in sons form two layers of annular protrusions 17 on the workpiece 16, and an undercut structure 18 is formed at the edge of the annular protrusion 17.

[0020] When opening the mold (such as Figure 3 As shown in the figure, under the action of the mold clamp 14, the fixed mold plate 2 and the movable mold plate 7 are temporarily connected to each other, and the movable mold plate 7 and the first pull-out plate 6 are first opened. Since the bottom end of the first pull-in sub-piece 10 is fixedly connected to the first pull-out plate 6, the first pull-in sub-piece 10 first moves downward relative to the workpiece 16, and its end is pulled out from the workpiece 16. During the pulling-out process, the inner layer annular protrusion 17 on the workpiece 16 will undergo a slight elastic deformation, and the inner layer annular protrusion 17 is removed by forced removal.

[0021] Continue to open the mold (such as Figure 4As shown in the figure, under the action of the limiting bolt 15, the movable template 7 and the first drawing plate 6 are no longer separated. At this time, the movable template 7 is separated from the fixed die plate 2. Since the limiting ring 13 at the bottom of the secondary first drawing sub 11 is bound by the edge of the top opening of the secondary first drawing sub action block 9, the secondary first drawing sub 11 begins to move downward relative to the fixed die plate 2, and its end is pulled out from the workpiece 16. During the pulling process, the outer annular protrusion 17 on the workpiece 16 undergoes a slight elastic deformation, and the outer annular protrusion 17 is removed by forced removal.

[0022] After the mold is completely opened, the ejector plate moves, and the ejector pushes the workpiece 16 out of the movable mold core 8 to achieve demoulding.

Claims

1. A secondary core pulling mold, comprising a fixed mold part and a movable mold part matching each other, the fixed mold part comprising an upper take-out plate (1), a fixed mold plate (2) being arranged below the upper take-out plate (1), a fixed mold core (3) being arranged inside the fixed mold plate (2), the movable mold part comprising a lower take-out plate (4), a square iron (5), a first pull-out plate (6) and a movable mold plate (7) being arranged above the lower take-out plate (4), a movable mold core (8) being arranged inside the movable mold plate (7), when the mold is closed, the fixed mold core (3) and the movable mold core (8) are enclosed together to form a cavity, characterized in that: A secondary first pull-in sub-acting block (9) is arranged inside the first pull-out plate (6), a cylindrical primary first pull-in sub-acting block (10) is movably connected inside the secondary first pull-in sub-acting block (9), a cylindrical secondary first pull-in sub-acting block (11) and a spring (12) are movably sleeved outside the primary first pull-in sub-acting block (10), the spring (12) is located below the secondary first pull-in sub-acting block (11), a limiting ring (13) is arranged at the bottom end of the secondary first pull-in sub-acting block (11), and a top opening of the secondary first pull-in sub-acting block (9) is smaller than the outer contour of the limiting ring (13). A mold locker (14) is provided between the fixed mold plate (2) and the movable mold plate (7), and a limit bolt (15) is provided between the movable mold plate (7) and the first pull plate (6). In the mold closing state, the top ends of the first pull-in piece (10) and the second pull-in piece (11) are both located in the mold cavity to occupy positions.

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