A helical gear demoulding die capable of realizing sequential mold opening control

Abstract

The cam is provided with a toothed plate and a toothed plate, and the toothed plate is provided with a toothed plate and a toothed plate, wherein the toothed plate is provided with a toothed plate and a toothed plate.

Description

Technical Field

[0001] The invention relates to the field of injection molding, in particular to a helical gear demoulding mold capable of realizing sequential mold opening control. Background Art

[0002] Currently, worm gears, pulleys, and helical gears are widely used in the transmission systems of automotive audio systems and various movement components. High-precision worm gear transmission mechanisms offer advantages such as compact structure, reliable operation, and high production efficiency. However, compared to spur gear components, their complex shapes and high dimensional accuracy requirements make them more difficult to produce. Common worm gear molds typically have their tooth profiles located on the same side as the ejection mechanism. Part demolding is typically achieved through the machine tool's mold opening action and ejection by ejector pins. However, for parts with helical teeth and gates located on the same side of the fixed mold, existing production methods simply cannot achieve this.

[0003] When performing injection molding on workpieces with helical gear profiles, rotary demoulding is usually used for demoulding. In the traditional structure, the helical gear profile is set on the movable mold side. In this structure, the demoulding and ejection actions are located on the same side, and the sequential action of the mold is mainly achieved by utilizing the mold opening action of the machine tool.

[0004] However, sometimes, due to the limitations of product shape and usage requirements, if the tooth profile is set on the movable mold side, the product cannot be ejected.

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

[0006] The present invention aims to solve the above technical problems and proposes a mold with a simple structure, ingenious design, reasonable layout, and the ability to quickly and smoothly realize the demoulding operation after injection molding of helical gears.

[0007] The technical solution of the present invention is: a helical gear demoulding mold capable of realizing sequential mold opening control, characterized in that: the mold comprises a fixed mold part and a movable mold part that match each other,

[0008] The fixed mold part includes a fixed mold mounting plate 1 and a fixed mold plate 2, and a positioning ring 3 is commonly provided in the fixed mold mounting plate 1 and the fixed mold plate 2. A material channel 4 that passes directly through the mold cavity is opened in the positioning ring 3, and a countersunk hole is opened on the bottom end surface of the fixed mold mounting plate 1. A spring 5 is provided in the countersunk hole, and the spring 5 contacts the top surface of the fixed mold plate 2. A core pad 6 and a core fixing plate 7 are also movably connected in the fixed mold mounting plate 1, and a first limiting screw 8 is connected to the core fixing plate 7. The bottom end of the first limiting screw 8 is fixedly connected to the fixed mold plate 2. A first pressing plate 9 is also provided in the fixed mold mounting plate 1, and a second pressing plate 10 located below the first pressing plate 9 is also provided on the top of the fixed mold plate 2. The core fixing plate 7 is also connected to the guide column 11, and the lower part of the guide column 11 passes through the first pressing plate 9 and the second pressing plate 10, and is movably connected in the guide sleeve 12 provided in the fixed mold plate 2.

[0009] The core fixing plate 7 is connected to the top of the fixed mold center core 13. The fixed mold center core 13 is located in the mold cavity in the mold closing state. A fixed mold core 14 is also provided in the fixed mold plate 2. The fixed mold center core 13 is movably connected to the fixed mold core 14.

[0010] The movable mold part includes a movable mold core 15 that matches the fixed mold core 14, and a movable mold center core 16 that matches the fixed mold center core 13 is provided in the movable mold core 15.

[0011] A second limiting screw 17 is provided in the fixed mold mounting plate 1, and the bottom end of the second limiting screw 17 is fixedly connected to the fixed mold plate 2.

[0012] The first pressing plate 9 is provided with a through hole, in which a support block 18 is movably connected. In the mold closing state, the support block 18 is located between the second pressing plate 10 and the core fixing plate 7.

[0013] A flat shaft section is provided in the middle of the fixed mold core 14, and a passive tooth 19 is connected to the outer outer surface of the flat shaft section. The passive tooth 19 is engaged with the transition tooth 20 rotatably supported in the fixed mold plate 2, and the transition tooth 20 is engaged with the active tooth 21 provided on the working end of the drive motor.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] This helical gear demolding mold, which can achieve sequential mold opening control, has a simple structure, ingenious design, and reasonable layout. It addresses the problems existing in the use of traditional helical gear demolding molds by designing a special structure. First, for certain special-shaped products, the toothed portion is located on the side of the fixed mold to ensure normal product ejection. Furthermore, the toothed portion is driven to rotate by a motor and its matching transmission pair, and the sequence of primary and secondary mold openings is controlled by springs and limit screws. This ensures that the movable and fixed molds can separate and the product can be ejected only after the product with helical teeth has successfully separated from the cavity. Furthermore, this mold is safe and reliable, ensuring smooth production. Therefore, it can be said that it has multiple advantages and is particularly suitable for promotion and application in this field, with a very broad market prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of an embodiment of the present invention (mold closing state).

[0017] Figure 2 It is a structural schematic diagram of an embodiment of the present invention (one-time mold opening).

[0018] Figure 3 It is a structural schematic diagram of an embodiment of the present invention (the core at the center of the fixed mold is retracted).

[0019] Figure 4 It is a structural schematic diagram of an embodiment of the present invention (secondary mold opening).

[0020] Figure 5 Schematic diagram of the structure of the passive gear and the active gear in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention will be described below with reference to the accompanying drawings. Figures 1 to 5 As shown: A helical gear demoulding mold capable of realizing sequential mold opening control, which includes a fixed mold part and a movable mold part that match each other.

[0022] The fixed mold part includes a fixed mold mounting plate 1 and a fixed mold plate 2, and a positioning ring 3 is commonly provided in the fixed mold mounting plate 1 and the fixed mold plate 2. A material channel 4 that passes directly through the mold cavity is opened in the positioning ring 3, and a countersunk hole is opened on the bottom end surface of the fixed mold mounting plate 1. A spring 5 is provided in the countersunk hole, and the spring 5 contacts the top surface of the fixed mold plate 2. A core pad 6 and a core fixing plate 7 are also movably connected in the fixed mold mounting plate 1, and a first limiting screw 8 is connected to the core fixing plate 7. The bottom end of the first limiting screw 8 is fixedly connected to the fixed mold plate 2. A first pressing plate 9 is also provided in the fixed mold mounting plate 1, and a second pressing plate 10 located below the first pressing plate 9 is also provided on the top of the fixed mold plate 2. The core fixing plate 7 is also connected to the guide column 11, and the lower part of the guide column 11 passes through the first pressing plate 9 and the second pressing plate 10, and is movably connected in the guide sleeve 12 provided in the fixed mold plate 2.

[0023] The core fixing plate 7 is connected to the top of the fixed mold center core 13. The fixed mold center core 13 is located in the mold cavity in the mold closing state. A fixed mold core 14 is also provided in the fixed mold plate 2. The fixed mold center core 13 is movably connected to the fixed mold core 14.

[0024] The movable mold part includes a movable mold core 15 that matches the fixed mold core 14, and a movable mold center core 16 that matches the fixed mold center core 13 is provided in the movable mold core 15.

[0025] A second limiting screw 17 is provided in the fixed mold mounting plate 1, and the bottom end of the second limiting screw 17 is fixedly connected to the fixed mold plate 2.

[0026] The first pressing plate 9 is provided with a through hole, in which a support block 18 is movably connected. In the mold closing state, the support block 18 is located between the second pressing plate 10 and the core fixing plate 7.

[0027] A flat shaft section is provided in the middle of the fixed mold core 14, and a passive tooth 19 is connected to the outer outer surface of the flat shaft section. The passive tooth 19 is engaged with the transition tooth 20 rotatably supported in the fixed mold plate 2, and the transition tooth 20 is engaged with the active tooth 21 provided on the working end of the drive motor.

[0028] The working process of the helical gear demoulding mold capable of realizing sequential mold opening control according to the embodiment of the present invention is as follows: Figure 1 As shown in FIG5 ), the fixed mold core 14 and the movable mold core 15 are in a mutually matched state, the fixed mold center core 13 and the movable mold center core 16 are also in a mutually matched state, and the molding machine injects the molten material into the mold cavity through the material channel 4. After the material enters and fills the mold cavity, it is cooled and formed, and then the mold is opened;

[0029] The movable mold moves as a whole in the direction away from the fixed mold. After the pressure between the movable and fixed molds is removed, the space between the fixed mold mounting plate 1 and the fixed mold plate 2 is opened first (such as Figure 2 As shown), during the mutual movement of the two, since the core fixing plate 7 is connected to the fixed mold plate 2 by the first limit screw 8, the movement of the fixed mold plate 2 will pull the core fixing plate 7 to move together, that is, the core fixing plate 7 moves relative to the fixed mold mounting plate 1, and in this process, since the core fixing plate 7 is also connected to the top of the fixed mold center core 13, the fixed mold center core 13 does not move relative to the movable mold center core 16 during one mold opening action, and the two are still in a mold closing state;

[0030] After one mold opening action is completed, the control system will send a signal to the drive motor, and the drive motor will drive the active tooth 21 to rotate. The active tooth 21 drives the passive tooth 19 to rotate through the transition tooth 20. Since the center of the passive tooth 19 is connected to the flat shaft section in the middle of the fixed mold core 14, the passive tooth 19 will drive the fixed mold core 14 to rotate. Since the workpiece has a spiral helical tooth structure, when the fixed mold core 14 rotates relative to the workpiece, the fixed mold core 14 will rotate and rise at the same time to realize the thread removal action, that is, the retreat action of the fixed mold core 14 (such as Figure 3 As shown), during this process, the fixed model core 14 will also move relative to the passive gear 1 9 Movement along its own axis;

[0031] After the thread stripping action is completed, the movable mold part continues to move in the direction away from the fixed mold part (such as Figure 4 As shown), at this time, the second limit screw 17 moves to the maximum stroke, pulling the fixed mold plate 2, and the fixed mold plate 2 cannot move further. The movable mold plate drives the movable mold core 15 to separate from the fixed mold core 14, and the mold is opened. The product after the thread is removed is exposed to the air, and the ejector rod on the movable mold side moves to eject the product from the cavity, completing a complete demoulding and ejection operation.

Claims

1. A helical gear demoulding die capable of realizing sequential mold opening control, characterized in that: The mold includes a fixed mold part and a movable mold part that match each other. The fixed mold part comprises a fixed mold mounting plate (1) and a fixed mold plate (2), wherein a positioning ring (3) is provided in the fixed mold mounting plate (1) and the fixed mold plate (2), wherein a material channel (4) passing through the mold cavity is provided in the positioning ring (3), a countersunk hole is provided on the bottom end surface of the fixed mold mounting plate (1), a spring (5) is provided in the countersunk hole, and the spring (5) contacts the top end surface of the fixed mold plate (2), and a core pad (6) and a core fixing plate (7) are movably connected in the fixed mold mounting plate (1), wherein the core fixing plate (7) A first limiting screw (8) is connected to the upper portion, the bottom end of the first limiting screw (8) is fixedly connected to the fixed template (2), a first pressing plate (9) is further provided in the fixed template mounting plate (1), and a second pressing plate (10) located below the first pressing plate (9) is further provided on the top of the fixed template (2), the core fixing plate (7) is also connected to the guide column (11), the lower portion of the guide column (11) passes through the first pressing plate (9) and the second pressing plate (10), and is movably connected to the guide sleeve (12) provided in the fixed template (2). The core fixing plate (7) is connected to the top of the fixed mold center core (13). The fixed mold center core (13) is located in the mold cavity in the mold closing state. A fixed mold core (14) is also provided in the fixed mold plate (2). The fixed mold center core (13) is movably connected to the fixed mold core (14). The movable mold part includes a movable mold core (15) that matches the fixed mold core (14), and a movable mold center core (16) that matches the fixed mold center core (13) is provided in the movable mold core (15). A second limiting screw (17) is provided in the fixed mold mounting plate (1), and the bottom end of the second limiting screw (17) is fixedly connected to the fixed mold plate (2). The first pressing plate (9) is provided with a through hole, in which a support block (18) is movably connected. In the mold closing state, the support block (18) is located between the second pressing plate (10) and the core fixing plate (7). A flat shaft section is provided in the middle of the fixed mold core (14), and a passive tooth (19) is connected to the outer shell of the flat shaft section. The passive tooth (19) is meshed with a transition tooth (20) rotatably supported in the fixed mold plate (2), and the transition tooth (20) is meshed with an active tooth (21) provided on the working end of the drive motor.

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