Die with hidden ejector rod

Abstract

The utility model discloses a mould with a hidden ejector rod, which comprises a fixed mould part and a movable mould part, the fixed mould part comprises a fixed mould taking and attaching plate, a stripper plate and a fixed mould plate are sequentially arranged below the fixed mould taking and attaching plate, and the movable mould part comprises a movable mould taking and attaching plate. A top plate bottom plate, an ejector rod plate, square iron, a movable mold bottom plate and a movable mold plate are sequentially arranged above 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, and in the mold closing state, the fixed mold core and the movable mold core jointly define a mold cavity; the mold is characterized in that two symmetrically-distributed locking blocks are arranged on the bottom end face of the fixed mold plate, inclined guide columns are arranged on the locking blocks, a sliding block seat is connected into the movable mold plate in a sliding mode, inclined guide grooves matched with the inclined guide columns are formed in the sliding block seat, a sliding block is connected to the sliding block seat, and the sliding block is located at the end, close to the mold cavity, of the sliding block seat.

Description

Technical Field

[0001] The utility model relates to the field of injection molding, in particular to a mold with a hidden ejector pin. Background Art

[0002] Injection molding is a low-cost mass production process for plastic products. Injection molds are required during the injection molding process. After the molds are closed, the molding machine injects molten material into the mold cavity. After the material cools, it forms a product that matches the shape of the cavity.

[0003] Some products have undercut structures, so a slider structure needs to be set in the mold. When the mold is closed, the slider enters the cavity to form a placeholder. When the mold is opened, the slider is pulled out and separated from the undercut structure. Then the ejector pin ejects the product from the cavity. During this process, the movement direction of the slider and the movement direction of the ejector pin form an angle with each other (generally perpendicular to each other), thereby ensuring that the product can be demolded smoothly.

[0004] However, for some products with special shapes, the undercut structure is a circular ring, that is, the undercut structure exists in the 360° direction of the circumference. This requires that the slider must be able to occupy all the 360° direction of the circumference, and the ejector pin in the traditional mold structure needs to contact the workpiece in the mold closing state to ensure that the workpiece can be ejected after the mold is opened and during ejection. However, when encountering the above situation (the slider is fully occupied in the 360° direction of the circumference), the position of the ejector pin is occupied by the slider. Therefore, once the above problem is encountered, a push plate structure is required. Compared with the ejector pin, the push plate has relatively poor ejection effect. It can only separate part of the workpiece from the cavity, but part of the workpiece will still remain in the cavity. In this way, it is necessary to add a robot to pick up the workpiece after the push plate makes the ejection action, which extends the production cycle and reduces work efficiency.

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

[0006] The utility model aims to solve the above-mentioned deficiencies in the prior art and provides a mold with simple structure, ingenious design and reasonable layout, which can realize workpiece ejection and demoulding by using a push rod when a slide block is in place.

[0007] The technical solution of the utility model is: a mold with a hidden ejector, including a fixed mold part and a movable mold part, the fixed mold part includes a fixed mold taking plate 1, a stripping plate 2 and a fixed mold plate 3 are sequentially arranged below the fixed mold taking plate 1, the movable mold part includes a movable mold taking plate 4, a top plate bottom plate 5, an ejector plate 6, a square iron 7, a movable mold bottom plate 8 and a movable mold plate 9 are sequentially arranged above the movable mold taking plate 4, a fixed mold core is arranged in the fixed mold plate 3, and a movable mold core is arranged in the movable mold plate 9. In the mold closing state, the fixed mold core and the movable mold core are jointly surrounded to form a cavity, characterized in that: two symmetrically distributed locking blocks 10 are arranged on the bottom end surface of the fixed mold plate 3, an inclined guide column 11 is arranged on the locking block 10, and a slider seat 12 is slidably connected in the movable mold plate 9, and an inclined guide groove matching the inclined guide column 11 is opened on the slider seat 12, and a slider 13 is connected to the slider seat 12, and the slider 13 is located on the slider seat 12 at one end close to the cavity.

[0008] The end of the slider 13 is semi-circular. In the mold closing state, the semi-circular slider end is located in the cavity and forms a part of the cavity. At the same time, the two semi-circular sliders are assembled into a complete ring.

[0009] A spring receiving groove is provided on the slider seat 12, and a spring 14 is provided in the spring receiving groove. One end of the spring 14 presses against the side of the moving model core.

[0010] The ejector plate 6 is connected with an ejector 15. In the mold closing state, the top end of the ejector 15 is located below the slider 13. At the same time, the movement trajectory of the ejector 15 interferes with the workpiece formed by the cavity.

[0011] A mold locker 16 and a limit screw 17 are provided between the movable mold plate 9 and the movable mold bottom plate 8, an outer pull plate assembly 18 is provided between the movable mold plate 9 and the fixed mold plate 3, and an inner pull plate assembly 19 is provided in the fixed mold part.

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

[0013] This type of mold with a hidden ejector has a simple structure, ingenious design, and reasonable layout. It is designed to solve the problems encountered by traditional molds when performing injection molding of workpieces with an annular undercut structure. Compared with the traditional push plate structure, it has a simpler structure and occupies less space. It still uses an ejector to achieve demoulding, which can achieve one-time demoulding, avoiding the need to add a manipulator to assist demoulding after the push plate is pushed, reducing production cycles and improving work efficiency. In addition, the manufacturing process of this mold 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 prospects are very broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0015] Figure 2 It is a partial enlarged view of an embodiment of the utility model. DETAILED DESCRIPTION

[0016] The specific implementation of the present utility model will be described below in conjunction with the accompanying drawings. Figure 1 , Figure 2 As shown: a mold with a hidden ejector, comprising a fixed mold part and a movable mold part, the fixed mold part comprising a fixed mold taking plate 1, a stripping plate 2 and a fixed mold plate 3 are sequentially arranged below the fixed mold taking plate 1, the movable mold part comprising a movable mold taking plate 4, a top plate bottom plate 5, an ejector plate 6, a square iron 7, a movable mold bottom plate 8 and a movable mold plate 9 are sequentially arranged above the movable mold taking plate 4, a fixed mold core is arranged in the fixed mold plate 3, and a movable mold core is arranged in the movable mold plate 9. In the mold closing state, the fixed mold core and the movable mold core are jointly surrounded to form a cavity, characterized in that: two symmetrically distributed locking blocks 10 are arranged on the bottom end surface of the fixed mold plate 3, an inclined guide column 11 is arranged on the locking block 10, a slider seat 12 is slidably connected in the movable mold plate 9, an inclined guide groove matching the inclined guide column 11 is opened on the slider seat 12, a slider 13 is connected to the slider seat 12, and the slider 13 is located on the slider seat 12 at one end close to the cavity.

[0017] The end of the slider 13 is semi-circular. In the mold closing state, the semi-circular slider end is located in the cavity and forms a part of the cavity. At the same time, the two semi-circular sliders are assembled into a complete ring.

[0018] A spring receiving groove is provided on the slider seat 12, and a spring 14 is provided in the spring receiving groove. One end of the spring 14 presses against the side of the moving model core.

[0019] The ejector plate 6 is connected with an ejector 15. In the mold closing state, the top end of the ejector 15 is located below the slider 13. At the same time, the movement trajectory of the ejector 15 interferes with the workpiece formed by the cavity.

[0020] A mold locker 16 and a limit screw 17 are provided between the movable mold plate 9 and the movable mold bottom plate 8, an outer pull plate assembly 18 is provided between the movable mold plate 9 and the fixed mold plate 3, and an inner pull plate assembly 19 is provided in the fixed mold part.

[0021] The working process of the mold with hidden ejector pins in the embodiment of the utility model is as follows: in the mold closing state, the fixed mold core and the movable mold core are combined to form a mold cavity, at which time the semi-circular end of the slider 13 is also located in the mold cavity, and the two semi-circular ends contact each other and merge to form a complete ring, the ejector pin 15 is located below the slider 13, and the top end of the ejector pin 15 is located outside the mold cavity;

[0022] The molding machine injects molten material into the cavity, and the material is cooled to form a workpiece 20. The workpiece 20 forms a ring-shaped undercut structure at a position corresponding to the slider 13.

[0023] When the mold is opened, the stripper plate 2 and the fixed mold plate 3 are opened first, and the runner and the workpiece 20 are disconnected first;

[0024] Then the fixed mold taking plate 1 and the stripping plate 2 are separated, the material handle falls off from the stripping plate 2, and the manipulator takes the fallen material handle out of the mold;

[0025] Then the movable platen 9 and the fixed platen 3 are separated, and under the action of the inclined guide pillar 11 and the inclined guide groove, the slider seat 12 drives the slider 13 to move away from the cavity, and the slider 13 is pulled out from the annular undercut on the workpiece 20;

[0026] When the mold opening reaches the set position, the latch in the mold locker 16 is disengaged from the lock sleeve, and the movable mold plate 9 and the movable mold bottom plate 8 are separated from each other.

[0027] The molding machine drives the ejector plate 6 to move, and the ejector 15 moves toward the direction of the cavity. The ejector 15 will first push a certain distance, and then the ejector 15 will contact the workpiece 20 and eject the workpiece 20 from the cavity, thus completing an injection molding process.

Claims

1. A mold with a hidden ejector, comprising a fixed mold part and a movable mold part, the fixed mold part comprising a fixed mold taking-up plate (1), a stripper plate (2) and a fixed mold plate (3) being arranged in sequence below the fixed mold taking-up plate (1), the movable mold part comprising a movable mold taking-up plate (4), a top plate bottom plate (5), an ejector plate (6), a square iron (7), a movable mold bottom plate (8) and a movable mold plate (9) being arranged in sequence above the movable mold taking-up plate (4), a fixed mold core being arranged in the fixed mold plate (3), a movable mold core being arranged in the movable mold plate (9), and in a mold closing state, the fixed mold core and the movable mold core are enclosed together to form a mold cavity, characterized in that: Two symmetrically distributed locking blocks (10) are arranged on the bottom end surface of the fixed mold plate (3), and an inclined guide column (11) is arranged on the locking block (10). A slider seat (12) is slidably connected in the movable mold plate (9), and an inclined guide groove matching the inclined guide column (11) is formed on the slider seat (12). A slider (13) is connected to the slider seat (12), and the slider (13) is located on one end of the slider seat (12) close to the mold cavity. The end of the slider (13) is semi-annular. In the mold closing state, the semi-annular slider end is located in the mold cavity and forms a part of the mold cavity. At the same time, the two semi-annular sliders are assembled into a complete ring. A spring receiving groove is provided on the slider seat (12), a spring (14) is provided in the spring receiving groove, and one end of the spring (14) is pressed against the side surface of the moving model core. The ejector plate (6) is connected to an ejector rod (15). In the mold closing state, the top end of the ejector rod (15) is located below the slider (13). At the same time, the movement trajectory of the ejector rod (15) interferes with the workpiece formed by the cavity. A mold locker (16) and a limit screw (17) are provided between the movable mold plate (9) and the movable mold bottom plate (8), an outer pull plate assembly (18) is provided between the movable mold plate (9) and the fixed mold plate (3), and an inner pull plate assembly (19) is provided in the fixed mold portion.

Images