Die capable of realizing secondary ejection of ejector sleeve

Abstract

A mold capable of achieving secondary ejection of an ejector sleeve comprises a fixed mold part and a movable mold part, the fixed mold part comprises a fixed mold taking and attaching plate, a fixed mold ejector rod bottom plate, a fixed mold ejector rod plate, square iron and a fixed mold plate are sequentially arranged below the fixed mold taking and attaching plate, the movable mold part comprises a movable mold taking and attaching plate, and a movable mold plate is arranged on the movable mold 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, in the mold closing state, the fixed mold core and the movable mold core jointly define a mold cavity, the mold further comprises two symmetrically-distributed ejector rod oil cylinders, and the working ends of the two ejector rod oil cylinders are fixedly connected with the two ends of the fixed mold ejector rod bottom plate and the two ends of the fixed mold ejector rod plate respectively. A center pin shaft is fixedly connected to the fixed mold taking plate, an ejector sleeve is movably connected outside the center pin shaft in a sleeving manner, a spring is arranged at the top of the ejector sleeve, the top end of the spring is in contact with the bottom end surface of the fixed mold taking plate, a limiting step is further arranged in the middle of the ejector sleeve, and the limiting step is matched with the top end surface of the fixed mold plate.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to a mold that can realize secondary ejection of a push tube. Background Art

[0002] Injection molding is a production process for mass-producing plastic products at low cost. During the injection molding process, an injection mold is required. After the mold is closed, the molding machine injects molten material into the cavity of the mold, and the material forms a product that matches the shape of the cavity after cooling.

[0003] For a certain type of product, its appearance requirements are extremely strict, and no injection molding marks are allowed on the appearance surface. Therefore, when using the mold to produce this type of product, the gate position and the ejection mechanism need to be set entirely on the back side (non-appearance surface) of the product. Such a limitation causes the appearance surface of the workpiece to face only the moving mold side, while the ejection mechanism needs to be set in the fixed mold side.

[0004] At the same time, if there is an undercut structure that requires strong ejection through a pulling action in this type of product, an extremely complex double-rod undercut ejection mechanism also needs to be set in the fixed mold side. Since there are already structures such as runners in the fixed mold side itself, this will result in an extremely complex structure, large volume, and increased cost on the fixed mold side of the mold.

[0005] Therefore, there is a need for a method or device that can solve the above problems now. Summary of the Invention

[0006] The utility model is proposed to solve the above-mentioned deficiencies of the prior art, and provides a mold that can realize secondary ejection of a push tube, which has a simple structure, ingenious design, reasonable layout, compact structure, and low cost.

[0007] The technical solution of the utility model is: a mold that can realize secondary ejection of a push tube, including a fixed mold part and a moving mold part, characterized in that: the fixed mold part includes a fixed mold mounting plate 1, and a fixed mold ejector rod bottom plate 2, a fixed mold ejector rod plate 3, a square iron 4, and a fixed mold plate 5 are sequentially arranged below the fixed mold mounting plate 1. The moving mold part includes a moving mold mounting plate 6, and a moving mold plate 7 is arranged on the moving mold mounting plate 6. A fixed mold core 8 is arranged in the fixed mold plate 5, and a moving mold core 9 is arranged in the moving mold plate 7. In the closed mold state, the fixed mold core 8 and the moving mold core 9 jointly enclose to form a cavity.

[0008] The mold further includes two symmetrically distributed ejector rod cylinders 10, and the working ends of the two ejector rod cylinders 10 are respectively fixedly connected to both ends of the fixed mold ejector rod bottom plate 2 and the fixed mold ejector rod plate 3.

[0009] A central pin shaft 11 is fixedly connected to the fixed mold mounting plate 1. A push tube 12 is movably sleeved outside the central pin shaft 11. A spring 13 is arranged at the top of the push tube 12. The top end of the spring 13 contacts the bottom end surface of the fixed mold mounting plate 1. A limiting step 14 is further arranged in the middle of the push tube 12. The limiting step 14 matches the top end surface of the fixed mold plate 5.

[0010] The bottom ends of the central pin shaft 11 and the push tube 12 are forming parts, and the forming parts are cylindrical cavities. The top of the cavity is an inverted buckled edge structure.

[0011] A ejector rod 16 is also connected to the fixed mold ejector rod bottom plate 2 and the fixed mold ejector rod plate 3. In the mold closing state, the bottom end surface of the ejector rod 16 is located above the cavity. The cylindrical cavity formed by the forming part is communicated with the cavity.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] The mold with secondary ejection of the push tube in this structural form has a simple structure, ingenious design and reasonable layout. It designs a special structure for the problems encountered in the injection molding process of some products with extremely high requirements for appearance quality. First of all, it arranges the ejector rod mechanism (ejector rod plate, ejector rod bottom plate and ejector rod) on the fixed mold side, so that the ejector rod contacts the non-appearance surface of the product to prevent the marks left by ejection on the appearance surface of the product; at the same time, it also sets a relatively movable mandrel and push tube mechanism. When the mold is opened, the mandrel and the push tube act according to a predetermined sequence, so as to realize the undercut release action of the undercut structure existing on the protruding part of the product. The overall structure of this forming / undercut release mechanism is relatively simple, occupies a small space, can effectively save the overall volume and manufacturing cost of the mold. Therefore, it can be said that this mold has multiple advantages and is especially suitable for popularization and application in this field, and its market prospect is very broad. Description of the Drawings

[0014] Figure 1 is the front view of the embodiment of the utility model.

[0015] Figure 2 is the side view of the embodiment of the utility model.

[0016] Figure 3 is Figure 1 the partial enlarged view in Detailed Embodiment

[0017] The following will describe the detailed embodiment of the utility model in conjunction with the drawings. As Figure 1 、 Figure 2 、 Figure 3As shown: a mold capable of realizing secondary ejection of a push tube, comprising a fixed mold part and a movable mold part, wherein the fixed mold part comprises a fixed mold taking-off plate 1, below which are sequentially provided a fixed mold ejector bottom plate 2, a fixed mold ejector plate 3, a square iron 4 and a fixed mold plate 5, wherein the movable mold part comprises a movable mold taking-off plate 6, on which a movable mold plate 7 is provided, a fixed mold core 8 is provided in the fixed mold plate 5, and a movable mold core 9 is provided in the movable mold plate 7, and in a mold closing state, the fixed mold core 8 and the movable mold core 9 are enclosed together to form a cavity,

[0018] The mold further comprises two symmetrically distributed ejector cylinders 10, the working ends of the two ejector cylinders 10 are respectively fixedly connected to the two ends of the fixed mold ejector bottom plate 2 and the fixed mold ejector plate 3.

[0019] The fixed mold taking-up plate 1 is fixedly connected with a center pin 11, and a push tube 12 is movably sleeved outside the center pin 11. A spring 13 is arranged on the top of the push tube 12, and the top end of the spring 13 contacts the bottom end surface of the fixed mold taking-up plate 1. A limiting step 14 is also arranged in the middle of the push tube 12, and the limiting step 14 matches the top end surface of the fixed mold plate 5.

[0020] The bottom ends of the central pin 11 and the push tube 12 are formed into a forming part, and the forming part is a cylindrical cavity, and the top of the cavity is an inverted flange structure.

[0021] The fixed mold ejector bottom plate 2 and the fixed mold ejector plate 3 are also connected with ejector pins 16. In the mold closing state, the bottom end surface of the ejector pin 16 is located above the mold cavity, and the cylindrical cavity formed by the molding part is connected to the mold cavity.

[0022] The working process of the mold capable of realizing secondary ejection of the push tube in the embodiment of the utility model is as follows: in the mold closing state, the fixed mold core 8 and the movable mold core 9 surround and form a mold cavity, and the cylindrical cavity (i.e., the molding part) formed by the center pin 11 and the bottom end of the push tube 12 is connected to the mold cavity, that is, the molding part is essentially a part of the mold cavity;

[0023] The molding machine injects the molten material into the cavity. After the material fills the cavity, it is cooled to form a product 15. The appearance surface of the product 15 faces the movable mold side. The runner and the ejector 16 are both located on the non-appearance surface of the product 15. A tubular part with a flanged undercut structure at the top is formed at the molding part.

[0024] When opening the mold, the fixed mold plate 5 and the movable mold plate 7 are opened first, and the product 15 is left on the side of the fixed mold core 8.

[0025] After the above-mentioned action stops, the two ejector cylinders 10 are controlled by the control system to move synchronously at the same time, driving the fixed mold ejector bottom plate 2 and the fixed mold ejector plate 3 to move toward the movable mold side. When this movement occurs, the ejector 16 fixedly connected to the fixed mold ejector bottom plate 2 immediately performs an ejection action, and the push tube 12 also moves with the product 15 under the action of the spring 13 (at this time, the push tube 12 and the product 15 are still relatively motionless), but the top end of the center pin 11 is connected to the fixed mold taking-up plate 1, so when the product 15 moves away from the fixed mold core 8 under the action of the ejector 16, the center pin 11 will be relative to the product 15. Make an action of being drawn out from the inner wall of the tube-shaped part (in this process, the push tube 12 always remains stationary relative to the product 15);

[0026] With the movement of the fixed mold push rod bottom plate 2 and the fixed mold push rod plate 3, the push tube 12 gradually approaches the fixed mold plate 5. When the limit step 14 on the push tube 12 contacts the top surface of the fixed mold plate 5, the push tube 12 cannot continue to move, but the product 15 will still move under the action of the push rod 16, that is, the product 15 will move relative to the push tube 12, and the tube-shaped part will be pulled out from the inner wall of the push tube 12. During the pulling-out process, the undercut part at the top of the tube-shaped part undergoes elastic deformation, which is a strong demoulding operation.

[0027] At this point, the product 15 is separated from both the fixed mold side and the movable mold side, and the demoulding action is achieved.

Claims

1. A mold capable of realizing secondary ejection of a push tube, comprising a fixed mold part and a movable mold part, characterized in that: The fixed mold part comprises a fixed mold taking-out plate (1), below which are arranged a fixed mold ejector bottom plate (2), a fixed mold ejector plate (3), a square iron (4) and a fixed mold plate (5) in sequence; the movable mold part comprises a movable mold taking-out plate (6), on which is arranged a movable mold plate (7); a fixed mold core (8) is arranged in the fixed mold plate (5), and a movable mold core (9) is arranged in the movable mold plate (7); in a mold closing state, the fixed mold core (8) and the movable mold core (9) are jointly surrounded to form a mold cavity; The mold further comprises two symmetrically distributed ejector cylinders (10), the working ends of the two ejector cylinders (10) being fixedly connected to the two ends of the fixed mold ejector bottom plate (2) and the fixed mold ejector plate (3), respectively. The fixed die taking plate (1) is fixedly connected with a center pin (11), and a push tube (12) is movably sleeved outside the center pin (11). A spring (13) is provided at the top of the push tube (12), and the top end of the spring (13) contacts the bottom end surface of the fixed die taking plate (1). A limiting step (14) is also provided in the middle of the push tube (12), and the limiting step (14) matches the top end surface of the fixed die plate (5). The bottom ends of the central pin (11) and the push tube (12) are formed parts, and the formed part is a cylindrical cavity, and the top of the cavity is an inverted flange structure. The fixed mold ejector bottom plate (2) and the fixed mold ejector plate (3) are also connected to ejector rods (16); in the mold closing state, the bottom end surface of the ejector rod (16) is located above the mold cavity, and the cylindrical cavity formed by the molding portion is connected to the mold cavity.

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