A threaded core-pulling injection mold

Abstract

This utility model belongs to the field of injection mold technology, specifically relating to a threaded core-pulling injection mold, including a front mold and a rear mold. The front mold has a front cavity with a front core inside, and the rear mold has a rear cavity with a rear core inside. The front mold is provided with a threaded core-pulling mechanism, which includes a drive assembly and a threaded hole forming head connected to the drive end of the drive assembly. The drive assembly can drive the threaded hole forming head to extend between the front core and the rear core. This solution can improve the efficiency of threaded hole forming, reduce the risk of damage to internal threaded holes or breakage of plastic products, and improve product quality.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically relating to a threaded core-pulling injection mold. Background Technology

[0002] Plastic products possess advantages such as high strength, lightweight, and low cost, making them widely used in various aspects of daily life. In many fields, such as automobile manufacturing, plastic products have largely replaced metal products due to the demand for lightweighting. In my country, injection molds are crucial process equipment for producing various industrial products. With the rapid development of the plastics industry and the widespread application of plastic products in aerospace, electronics, machinery, shipbuilding, and automotive industries, the application of injection molds is becoming increasingly broad. An injection mold is a tool for producing plastic products; it is also a tool that gives plastic products their complete structure and precise dimensions. Injection molding is a processing method used for the mass production of certain complex-shaped parts. Specifically, it refers to injecting molten plastic under high pressure into a mold cavity using an injection molding machine, followed by cooling and solidification to obtain the molded product. For some injection molds with internal threaded holes, a forced ejection method is usually used to dislodge the screw from the threaded hole. This forced ejection method is not only inefficient but also easily damages the internal threaded hole or causes the plastic product to crack, affecting product quality and limiting its application in products requiring high precision. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a threaded core-pulling injection mold, which solves the problem that the existing forced demolding method is not only inefficient, but also prone to damaging the internal threaded hole or cracking the plastic product, affecting the product quality and limiting its application in products with high precision requirements.

[0004] The technical solution adopted by this utility model is as follows: a threaded core-pulling injection mold, including a front mold and a rear mold, wherein a front cavity is provided on the front mold and a front core is provided in the front cavity, and a rear cavity is provided on the rear mold and a rear core is provided in the rear cavity;

[0005] The front mold is provided with a threaded core pulling mechanism, which includes a drive assembly and a threaded hole forming head connected to the drive end of the drive assembly. The drive assembly can drive the threaded hole forming head to extend between the front core and the rear core.

[0006] Furthermore, the drive assembly includes a motor, a mounting base, a first gear, a second gear, a linkage rod, a transmission slide rod, and a transmission screw;

[0007] The front mold has an installation cavity, which is separated from the front cavity. The mounting seat is fixedly installed on the outer side wall of the front mold. The motor is fixedly installed on the outer side wall of the mounting seat. The drive end of the motor passes through the mounting seat, extends into the installation cavity, and is connected to the first gear. The transmission screw is threadedly connected to the inner side wall of the mounting seat. The inner end of the transmission screw extends into the installation cavity and is fixedly connected to the linkage rod. The second gear is fixedly sleeved on the linkage rod. The inner end of the linkage rod passes through the side wall between the installation cavity and the front cavity and is fixedly connected to the transmission slide rod. The inner end of the transmission slide rod is fixedly connected to a threaded hole forming head.

[0008] The first gear meshes with the second gear, and the length of the first gear is greater than the length of the second gear.

[0009] Furthermore, the threaded core-pulling mechanism also includes a guide assembly, which includes a guide seat and a sliding sleeve;

[0010] The guide seat is fixedly installed inside the front core, the sliding sleeve is fixedly sleeved inside the guide seat, and the transmission slide rod slides through the sliding sleeve.

[0011] Furthermore, a planar bearing is fixedly sleeved on the transmission slide rod. The planar bearing is located at the end of the transmission slide rod near the linkage rod. The diameter of the linkage rod is larger than the diameter of the transmission slide rod. The planar bearing is located between the guide seat and the linkage rod. The outer end face of the planar bearing abuts against the inner end face of the linkage rod, and the inner end face of the planar bearing can abut against the outer end face of the guide seat.

[0012] The beneficial effects of this utility model are as follows: The threaded core pulling mechanism automatically drives the threaded hole forming head to complete the formation and withdrawal of the threaded hole. This automated process simplifies the demolding process and improves the overall production efficiency. The threaded core pulling mechanism can ensure that the threaded hole forming head is smoothly removed according to the preset path after the product cools down, and the product is less likely to be damaged due to inappropriate external force. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model (in the mold-open state);

[0014] Figure 2 This is a schematic diagram of the overall structure of this utility model (molded state);

[0015] Figure 3 This is a partial structural schematic diagram of the present invention (the front mold is not shown in the figure);

[0016] Figure 4 This is a schematic diagram of the front mold in this utility model (the driving component is not shown in the figure).

[0017] Figure 5 This is a cross-sectional view of the threaded core-pulling mechanism in this utility model;

[0018] Figure 6 This is a schematic diagram of the structure of the plastic product in this utility model;

[0019] The attached diagram is labeled as follows:

[0020] Front mold 1, front cavity 11, front core 12, mounting cavity 13, rear mold 2, rear cavity 21, rear core 22, drive assembly 3, motor 31, mounting base 32, first gear 33, second gear 34, linkage rod 35, transmission slide rod 36, transmission screw 37, plane bearing 38, threaded hole forming head 4, guide assembly 5, guide seat 51, sliding sleeve 52, plastic product 6, threaded hole forming component 61. Detailed Implementation

[0021] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0022] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example 1:

[0025] like Figures 1-6As shown, a threaded core-pulling injection mold includes a front mold 1 and a rear mold 2. The front mold 1 has a front cavity 11, and a front core 12 is disposed within the front cavity 11. The rear mold 2 has a rear cavity 21, and a rear core 22 is disposed within the rear cavity 21. The front cavity 11 of the front mold 1 and the rear cavity 21 of the rear mold 2 are arranged opposite to each other, and a plastic product is formed between the front core 12 and the rear core 22. In this embodiment, the front mold 1 is provided with a sprue and a runner. The sprue on the front mold 1 is connected to the front cavity 11 through the runner. The rear mold 2 is provided with an ejection mechanism for ejecting the formed plastic product from the rear mold 2.

[0026] The front mold 1 is provided with a threaded core pulling mechanism, which includes a drive assembly 3 and a threaded hole forming head 4 connected to the drive end of the drive assembly 3. The drive assembly 3 can drive the threaded hole forming head 4 to extend between the front core 12 and the rear core 22.

[0027] As a preferred embodiment, the drive assembly 3 includes a motor 31, a mounting base 32, a first gear 33, a second gear 34, a linkage rod 35, a transmission slide rod 36, and a transmission screw 37.

[0028] The front mold 1 has a mounting cavity 13, which is separated from the front cavity 11. In this embodiment, a partition wall is formed between the mounting cavity 13 and the front cavity 11. The mounting seat 32 is fixedly mounted on the outer side wall of the front mold 1. The motor 31 is fixedly mounted on the outer side wall of the mounting seat 32. The drive end of the motor 31 extends through the mounting seat 32 into the mounting cavity 13 and is connected to the first gear 33. Specifically, the drive shaft of the motor 31 extends through the mounting seat 32 into the mounting cavity 13, and the end of the drive shaft of the motor 31 is rotatably connected to the partition wall. The first gear 33 is fixedly sleeved on the drive shaft of the motor 31 and is connected to the first gear 33. The transmission screw 37 is threadedly connected to... On the inner wall of the mounting base 32, the inner end of the transmission screw extends into the mounting cavity 13 and is fixedly connected to the linkage rod 35. The second gear 34 is fixedly sleeved on the linkage rod 35. The inner end of the linkage rod 35 passes through the side wall between the mounting cavity 13 and the front cavity 11 and is fixedly connected to the transmission slide rod 36. The inner end of the transmission slide rod 36 is fixedly connected to a threaded hole forming head 4. The first gear 33 meshes with the second gear 34. The length of the first gear 33 is greater than the length of the second gear 34. Specifically, when casting molten plastic, the inner end faces of the first gear 33 and the second gear 34 are flush. The length from the outer end face of the second gear 34 to the outer end face of the first gear 33 is greater than the length of the threaded hole forming head 4. After injection molding, once the product has cooled to a certain degree, motor 31 is started. Motor 31 drives its drive shaft to rotate, which in turn drives the first gear 33 to rotate. Since the first gear 33 meshes with the second gear 34, the rotation of the first gear 33 drives the second gear 34 to rotate, which in turn causes the linkage rod 35 to rotate. The rotation of the linkage rod 35 is transmitted to the transmission slide rod 36 through a fixed connection, ultimately causing the threaded hole forming head 4 to start rotating. Since the transmission screw 37 is threaded onto the inner wall of the mounting base 32, its rotation causes the transmission screw 37 to move axially, thereby pulling the screw... The thread forming head 4 exits the space formed by the front cavity 11 and the rear cavity 21. In this embodiment, when the motor 31 drives the first gear 33 to rotate, since the length of the first gear 33 is greater than that of the second gear 34, it ensures that the thread forming head 4 can accurately exit from the molded product during the core pulling process without damaging the threaded part of the product. Before the next injection molding, the motor 31 drives the first gear 33 to rotate in the opposite direction, pushing the thread forming head 4 into the space formed by the front cavity 11 and the rear cavity 21 to form the threaded hole structure of the plastic product.

[0029] As a preferred embodiment, the threaded core-pulling mechanism further includes a guide assembly 5, which includes a guide seat 51 and a sliding sleeve 52;

[0030] The guide seat 51 is fixedly installed inside the front core 12, and the sliding sleeve 52 is fixedly sleeved inside the guide seat 51. The sliding sleeve 52 is arranged along the axial direction of the slide rod, and the transmission slide rod 36 slides through the sliding sleeve 52. Through the cooperation of the guide seat 51 and the sliding sleeve 52, the transmission slide rod 36 slides along the inner wall of the sliding sleeve 52 under the drive of the drive assembly 3. The cooperation of the guide seat 51 and the sliding sleeve 52 provides stable support, precise guidance, and effective wear protection.

[0031] As a preferred embodiment, a planar bearing 38 is fixedly sleeved on the transmission slide rod 36. The planar bearing 38 is located at the end of the transmission slide rod 36 near the linkage rod 35. The diameter of the linkage rod 35 is larger than the diameter of the transmission slide rod 36. The planar bearing 38 is located between the guide seat 51 and the linkage rod 35. The outer end face of the planar bearing 38 abuts against the inner end face of the linkage rod 35, and the inner end face of the planar bearing 38 can abut against the outer end face of the guide seat 51. In this embodiment, by setting the planar bearing 38 between the guide seat 51 and the linkage rod 35, when the core is pulled from the threaded hole of the cooled and molded plastic product, the transmission screw 37 is driven to rotate outward under the action of the motor 31, the first gear 33 and the second gear 34. The planar bearing 38 can reduce the coefficient of friction between the inner end face of the transmission slide rod 36 and the outer end face of the guide seat 51, so that the transmission screw 37 can rotate more smoothly and reduce the risk of jamming due to excessive friction.

[0032] The working principle of this utility model is as follows:

[0033] In use, the front mold 1 and the rear mold 2 are closed. Molten plastic is injected into the front cavity 11 and the rear cavity 21 through the sprue and runner on the front mold 1, realizing the injection molding of the product. This ensures that the plastic can be evenly filled and form the required product shape, including the position where threaded holes need to be formed. After cooling and molding, the motor 31 is started. The motor 31 drives its drive shaft to rotate, which in turn drives the first gear 33 to rotate. Since the first gear 33 meshes with the second gear 34, the rotation of the first gear 33 will drive the second gear 34 to rotate, which in turn causes the linkage rod 35 to rotate. The rotation of the linkage rod 35 is transmitted to the transmission slide rod 36 through a fixed connection, ultimately forming the threaded hole shape. The forming head 4 begins to rotate. Since the transmission screw 37 is threadedly connected to the inner wall of the mounting base 32, its rotation causes the transmission screw 37 to move along its axial direction, thereby pulling the thread forming head 4 out of the space formed by the front cavity 11 and the rear cavity 21. When the motor 31 drives the first gear 33 to rotate, since the length of the first gear 33 is greater than that of the second gear 34, this ensures that the thread forming head 4 can accurately exit from the molded product during the core pulling process without damaging the threaded part of the product. Then the front and rear molds 2 open, and at the same time, the thread pulling mechanism separates from the plastic product 6 as the front mold 1 opens, and ejects the plastic product 6 from the rear mold 2 through the ejection mechanism.

[0034] Example 2:

[0035] The remaining features of Embodiment 2 are the same as those of Embodiment 1. The difference is that in Embodiment 2, the threaded hole forming head 4 and the transmission slide rod 36 are detachably connected. The threaded hole forming head 4 and the transmission slide rod 36 are threaded together, which makes it easy to replace threaded hole forming heads 4 of different lengths, thereby realizing the formation of internal threaded holes of different depths on the plastic product 6. Specifically, one end of the threaded hole forming head 4 is fixedly connected to a connecting screw. The transmission slide rod 36 has a corresponding connecting threaded hole. The connecting screw can be threaded into the connecting threaded hole, and the outer end face of the threaded hole forming head 4 abuts against the inner end face of the transmission slide rod 36.

[0036] The present invention has been described in detail above. The specific embodiments are provided only to help understand the method and core idea of ​​the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A thread core-pulling injection mold characterized by: It includes a front mold (1) and a rear mold (2). The front mold (1) has a front cavity (11) and a front core (12) is provided inside the front cavity (11). The rear mold (2) has a rear cavity (21) and a rear core (22) is provided inside the rear cavity (21). The front mold (1) is provided with a threaded core pulling mechanism, which includes a drive assembly (3) and a threaded hole forming head (4) connected to the drive end of the drive assembly (3). The drive assembly (3) can drive the threaded hole forming head (4) to extend between the front core (12) and the rear core (22).

2. A thread core-pulling injection mold according to claim 1, characterized in that: The drive assembly (3) includes a motor (31), a mounting base (32), a first gear (33), a second gear (34), a linkage rod (35), a transmission slide rod (36), and a transmission screw (37); The front mold (1) has an installation cavity (13) which is separated from the front cavity (11). The mounting seat (32) is fixedly installed on the outer side wall of the front mold (1). The motor (31) is fixedly installed on the outer side wall of the mounting seat (32). The driving end of the motor (31) extends through the mounting seat (32) into the installation cavity (13) and is connected to the first gear (33) for transmission. The transmission screw (37) is threadedly connected to the inner side wall of the mounting seat (32). The inner end of the transmission screw (37) extends into the installation cavity (13) and is fixedly connected to the linkage rod (35). The second gear (34) is fixedly sleeved on the linkage rod (35). The inner end of the linkage rod (35) extends through the side wall between the installation cavity (13) and the front cavity (11) and is fixedly connected to the transmission slide rod (36). The inner end of the transmission slide rod (36) is fixedly connected to a threaded hole forming head (4). The first gear (33) meshes with the second gear (34), and the length of the first gear (33) is greater than the length of the second gear (34).

3. A thread core-pulling injection mold according to claim 2, characterized in that: The threaded core-pulling mechanism further includes a guide assembly (5), which includes a guide seat (51) and a sliding sleeve (52); The guide seat (51) is fixedly installed inside the front core (12), the sliding sleeve (52) is fixedly sleeved inside the guide seat (51), and the transmission slide rod (36) slides through the sliding sleeve (52).

4. A thread core-pulling injection mold according to claim 3, characterized in that: A planar bearing (38) is fixedly sleeved on the transmission slide rod (36). The planar bearing (38) is located at the end of the transmission slide rod (36) near the linkage rod (35). The diameter of the linkage rod (35) is larger than the diameter of the transmission slide rod (36). The planar bearing (38) is located between the guide seat (51) and the linkage rod (35). The outer end face of the planar bearing (38) abuts against the inner end face of the linkage rod (35). The inner end face of the planar bearing (38) can abut against the outer end face of the guide seat (51).

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