A mold for processing internal thread plastic parts

Abstract

The present invention provides a processing mold for internally threaded plastic parts, comprising a front mold and a rear mold; the rear mold comprises a mold core assembly and a driving device; the mold core assembly comprises a product mold core and a threaded mold core rotatable by the driving device, the threaded mold core is provided with an external thread, the threaded mold core is sleeved in the product mold core, and an injection mold cavity is formed between the threaded mold core and the product mold core; the threaded mold core is hollow inside and accommodates a cooling shaft core, the threaded mold core can rotate relative to the cooling shaft core, the cooling shaft core is hollow inside to form an accommodating cavity, the accommodating cavity is connected to a refrigerant pipe, the accommodating cavity and the refrigerant pipe are filled with circulating cooling medium, the cooling shaft core and the refrigerant pipe are sealed and connected by a sealing structure, which solves the technical problem that long-rod internally threaded plastic parts are easily deformed during demolding.

Description

Technical Field

[0001] The invention relates to the technical field of plastic parts processing, in particular to a mold for processing internal thread plastic parts. Background Art

[0002] Plastic molds are tools used in the plastic processing industry to match plastic molding machines and give plastic products a complete configuration and precise size. Plastic molds are a tool for producing plastic products. They are composed of several groups of parts, and there is a molding cavity in this combination. During injection molding, the mold is clamped on the injection molding machine, and the molten plastic is injected into the molding cavity, where it is cooled and shaped. Then the front and rear molds are separated, and the product is ejected from the mold cavity by the ejection system. Finally, the mold is closed for the next injection molding. The entire injection molding process is carried out in a cycle.

[0003] The injection molding process of plastics mainly includes four stages: filling, holding pressure, cooling, and demolding. These four stages directly determine the molding quality of the product, and these four stages are a complete continuous process. Demolding is the last link in an injection molding cycle. Although the product has been cooled and formed, demolding still has a very important impact on the quality of the product. Improper demolding methods may cause uneven force on the product during demolding and cause product deformation during ejection. For example, when demolding an internal threaded workpiece with a long thread, the thread is prone to deformation, causing deformation and damage to the product. Therefore, it is particularly important to set up a mold that can prevent deformation of the internal threaded workpiece during demolding. Summary of the invention

[0004] The present invention aims to provide a mold for processing an internally threaded plastic part, so as to solve the technical problem in the prior art that an internally threaded plastic part with a long rod is easily deformed during demoulding.

[0005] To achieve the above-mentioned purpose, the present invention provides an internal thread plastic parts processing mold, including a front mold and a rear mold; the rear mold includes a core assembly and a driving device; the core assembly includes a product mold core and a threaded mold core that is rotatable by the driving device, the threaded mold core is provided with an external thread, the threaded mold core is sleeved in the product mold core, and an injection mold cavity is formed between the threaded mold core and the product mold core; the threaded mold core is hollow inside and accommodates a cooling shaft core, the threaded mold core can rotate relative to the cooling shaft core, the cooling shaft core is hollow inside to form a accommodating chamber, the accommodating chamber is connected to a refrigerant pipe, the accommodating chamber and the refrigerant pipe are filled with circulating cooling medium, and the cooling shaft core and the refrigerant pipe are sealed by a sealing structure.

[0006] Preferably, the cooling shaft core is a beryllium copper shaft core.

[0007] Preferably, the driving device includes a motor, a driving gear, a first driven gear and a second driven gear; when the motor rotates, the driving gear is driven to rotate; the first driven gear is respectively engaged with the driving gear and the second driven gear; the second driven gear drives the threaded mold core to rotate coaxially.

[0008] Preferably, the core mold assembly includes at least two groups, and the driving device includes at least two driving members respectively connected to the threaded core mold of each group of core mold assemblies to drive the threaded core mold to rotate.

[0009] Preferably, the threaded mold core is wrapped with a buffer component, and the buffer component is located at the gap between the driven gear and the threaded mold core.

[0010] Preferably, the sealing structure comprises a sealing groove and a sealing member arranged on the sealing groove, the groove cavity of the sealing groove is annular, the sealing member is adapted to the sealing groove, and the sealing member protrudes from the sealing groove to seal the cooling shaft core.

[0011] Preferably, the sealing element is a rubber ring.

[0012] Preferably, workpiece cooling channels are evenly inlaid in the cavity wall of the product mold core, and the workpiece cooling channels are connected to circulating cooling water.

[0013] Preferably, the bottom of the inner cavity of the product mold core has a plurality of protrusions, and the bottom of the inner cavity of the product mold core is in a pancake shape, and the portion of the inner cavity of the product mold core that accommodates the threaded mold core is columnar.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: since a driving device is provided to drive the threaded mold core to rotate, when the injection molding in the mold cavity is completed and the front mold and the rear mold are separated, the driving device drives the threaded mold core to rotate, and uses the external thread on the threaded mold core to remove the product from the threaded mold core, so that the product rotates along its own internal thread during demolding, and there is no need to demold by ejection, so that the internal thread of the product is not easy to deform; at the same time, a cooling channel and a cooling shaft core are provided, and the product is cooled by filling the accommodating cavity of the cooling shaft core and the refrigerant pipe with circulating cooling medium, so that the product is not easy to deform during demolding, and the cooling of the product is faster and more stable. The internal thread of the product is not easy to deform due to high temperature during demolding, which solves the technical problem that such long-rod internal threaded plastic parts are easy to deform during demolding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the internal thread plastic part processing mold of the present invention;

[0016] Figure 2 This is a schematic diagram of the internal structure of a mold for processing internally threaded plastic parts according to the present invention;

[0017] Figure 3 It is a schematic diagram of the structure of the thread mold core used to illustrate the present invention.

[0018] Reference numerals:

[0019] 1. Front mold; 2. Back mold; 21. Cooling shaft core; 212. Rubber ring; 22a. Third driven gear; 22b. Second driven gear; 23. Threaded mold core; 231. External thread; 24. Water inlet; 25. Water outlet; 26. Sealing water cover plate; 27. Cooling branch pipe; 28. Refrigerant pipe; 29. ​​Buffer; 210. Bearing; 3. Driving device; 31. Driving gear; 32. Hydraulic motor; 33. First driven gear; 4. Product. DETAILED DESCRIPTION

[0020] The embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The following is an embodiment of an internal thread plastic part processing mold of the present invention. For details, please refer to Figures 1 to 3 .

[0022] A mold for processing internally threaded plastic parts, comprising a front mold 1 and a rear mold 2; the rear mold 2 comprises a mold core assembly and a driving device 3; the mold core assembly comprises a product mold core (not shown in the figure) and a threaded mold core 23 rotatable by the driving device 3, the threaded mold core 23 is provided with an external thread 231, the threaded mold core 23 is sleeved in the product mold core, and an injection mold cavity is formed between the threaded mold core 23 and the product mold core; the threaded mold core 23 is hollow inside and accommodates a cooling shaft core 21, the threaded mold core 23 can rotate relative to the cooling shaft core 21, the cooling shaft core 21 is hollow inside to form a accommodating cavity, the accommodating cavity is connected to a refrigerant pipe 28, the accommodating cavity and the refrigerant pipe 28 are filled with circulating cooling medium, and the cooling shaft core 21 and the refrigerant pipe 28 are sealed and connected by a sealing structure.

[0023] Specifically, the core mold assembly includes at least two groups, and the driving device 3 includes at least two driving members respectively connected to the threaded core mold 23 of each group of core mold assemblies to drive the threaded core mold 23 to rotate.

[0024] Specifically, the driving device 3 includes a hydraulic motor 32, a driving gear 31, a first driven gear 33 and a second driven gear 22b; when the hydraulic motor 32 rotates, the driving gear 31 is driven to rotate; the first driven gear 33 is meshed with the driving gear 31 and the second driven gear 22b respectively; the second driven gear 22b drives the thread mold core 23 to rotate coaxially. It should be noted that the driving member includes the second driven gear 22b and the thread mold core 23 that rotates with the second driven gear 22b.

[0025] When there are two mold core assemblies, the driving device 3 further includes a third driven gear 22a and a threaded mold core 23 coaxially rotating with the third driven gear 22a. The third driven gear 22a is meshed with the first driven gear 33 to drive the third driven gear 22a to rotate.

[0026] Specifically, the cooling shaft core 21 is a beryllium copper shaft core.

[0027] The cooling shaft core 21 is made of beryllium copper, which improves the heat dissipation efficiency and has good sealing performance and is not easy to leak.

[0028] Specifically, the diameter of the portion of the threaded mold core 23 close to the driving device 3 is larger than the diameter of the portion of the threaded mold core 23 where the thread is provided. The portion of the threaded mold core 23 with a larger diameter is wrapped with a buffer 29. The buffer 29 is located in the gap between the driven gear and the threaded mold core 23, and is used to buffer the friction between the driven gear and the threaded mold core 23, preventing the driven gear and the threaded mold core 23 from rotating relative to each other, and also preventing direct friction between the threaded mold core 23 and the driven gear.

[0029] It should be noted that at least two bearings 210 are rotatably connected to the threaded core 23 near the driven gear, and the inner rings of the bearings 210 are rotatably connected to the cooling shaft core 21 .

[0030] Specifically, the sealing structure includes a sealing groove and a sealing member arranged on the sealing groove. The groove cavity of the sealing groove is annular and is arranged on the shaft wall at the end of the cooling shaft core 21. The sealing member is adapted to the sealing groove. The sealing member protrudes from the sealing groove to seal the cooling shaft core 21, and is used to prevent the refrigerant in the internal cavity of the cooling shaft core 21 and the refrigerant pipe 28 from overflowing and affecting the injection molding. Specifically, the sealing member is a rubber ring 212. In this embodiment, cooling water can be circulated in the refrigerant pipe 28, and water circulation is used to cool the plastic, so that the plastic is not easily deformed when cooled.

[0031] Specifically, workpiece cooling channels are evenly embedded in the cavity wall of the product mold core, and the workpiece cooling channels are connected to circulating cooling water. The workpiece cooling channel accommodates a sealing water cover and a plurality of cooling branches 27 connected to the sealing water cover. The sealing water cover plate 26 is ring-shaped and has a notch. A water inlet 24 and a water outlet 25 are respectively arranged at both ends of the notch formed by the sealing water cover plate 26. Water circulation and heat dissipation are performed through the water inlet 24 and the water outlet 25, thereby playing a role in heat dissipation and cooling of the plastic parts in the injection mold cavity; in this embodiment, the extension direction of the cooling branch 27 is the same as the demolding direction of the plastic parts, and a plurality of cooling branch pipes 27 are evenly distributed on the periphery of the injection mold cavity.

[0032] Specifically, the bottom of the inner cavity of the product mold core has a plurality of protrusions, and the bottom of the inner cavity of the product mold core is in a pancake shape, and the portion of the inner cavity of the product mold core that accommodates the threaded mold core 23 is in a columnar shape.

[0033] In the present embodiment, since a driving device 3 is provided to drive the threaded mold core 23 to rotate, when the injection molding in the mold cavity is completed and the front mold 1 and the rear mold 2 are separated, the driving device 3 drives the threaded mold core 23 to rotate, and utilizes the external thread 231 on the threaded mold core 23 to remove the product 4 from the threaded mold core 23, so that the product 4 rotates along its own internal thread when demolding, and there is no need to demold by ejection, so that the internal thread of the product 4 is not easily deformed; at the same time, a cooling channel and a cooling shaft core 21 are provided, and the cooling medium circulating in the accommodating cavity of the cooling shaft core 21 and the refrigerant pipe 28 is filled to cool the product 4, so that the product 4 is not easily deformed when demolding when it is cooled, and the cooling of the product 4 is more rapid and stable. The internal thread of the product 4 is not easily deformed due to high temperature when demolding, which solves the technical problem that such long-rod internal threaded plastic parts are easily deformed when demolding.

[0034] It should be noted that the driven gears in this embodiment refer to the second driven gear 22b and the third driven gear.

[0035] The working conditions of this embodiment are as follows: after injection molding into the mold cavity and cooling operation, the front mold 1 and the rear mold 2 are separated, and the front mold 1 remains on the injection molding machine. Then, the hydraulic motor 32 is driven to rotate, thereby driving the driving gear 31 to rotate, and further driving the second driven gear 22b and the third driven gear 22a to rotate through the first driven gear 33, thereby driving the threaded mold core 23 to rotate, and the product 4 falls off the threaded mold core 23, thereby realizing the demolding operation.

[0036] The above disclosures are only several preferred embodiments of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A mold for processing internal thread plastic parts, characterized in that: Including front mold and back mold; The rear mold includes a mold core assembly and a driving device; The mold core assembly includes a product mold core and a threaded mold core that is rotatably driven by the driving device, the threaded mold core is provided with an external thread, the threaded mold core is sleeved in the product mold core, and an injection mold cavity is formed between the threaded mold core and the product mold core; The threaded mold core is hollow inside and contains a cooling shaft core. The threaded mold core can rotate relative to the cooling shaft core. The cooling shaft core is hollow inside to form a receiving cavity. The receiving cavity is connected to a refrigerant pipe. The receiving cavity and the refrigerant pipe are filled with circulating cooling media. The cooling shaft core and the refrigerant pipe are sealed and connected via a sealing structure. The driving device includes a motor, a driving gear, a first driven gear and a second driven gear. When the motor rotates, the driving gear is driven to rotate; The first driven gear is meshed with the driving gear and the second driven gear respectively; The second driven gear drives the thread mold core to rotate coaxially; The core mold assembly comprises at least two groups, and the driving device comprises at least two driving members respectively connected to the threaded core mold of each group of core mold assemblies to drive the threaded core mold to rotate; The thread mold core is wrapped with a buffer component, and the buffer component is located at the gap between the driven gear and the thread mold core.

2. The internal thread plastic part processing mold according to claim 1, characterized in that: The cooling shaft core is a beryllium copper shaft core.

3. The internal thread plastic part processing mold according to claim 1, characterized in that: The sealing structure includes a sealing groove and a sealing member arranged on the sealing groove. The groove cavity of the sealing groove is annular. The sealing member is adapted to the sealing groove. The sealing member protrudes from the sealing groove to seal the cooling shaft core.

4. The internal thread plastic part processing mold according to claim 3, characterized in that: The sealing element is a rubber ring.

5. The internal thread plastic part processing mold according to claim 1, characterized in that: Workpiece cooling channels are evenly inlaid in the cavity wall of the product mold core, and the workpiece cooling channels are connected to circulating cooling water.

6. The internal thread plastic part processing mold according to claim 1, characterized in that: The bottom of the inner cavity of the product mold core has a plurality of protrusions, and the bottom of the inner cavity of the product mold core is in a pancake shape, and the part of the inner cavity of the product mold core that accommodates the threaded mold core is in a columnar shape.

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