Injection mold for internal thread product

Abstract

The utility model discloses an internal thread product injection mold, and relates to the field of injection molds, and the internal thread product injection mold comprises a thread mold core, a sliding block assembly, a rack, a gear and a pre-pressing spring; a shaft hole is formed in the sliding block assembly, and the thread mold core penetrates through the shaft hole. A thread structure is arranged at the top end of a shaft rod of the thread core; the top end of the thread core is sleeved with an internal thread area of the injection molding product; the pre-pressing spring is arranged in the middle of a shaft rod of the thread core in a sleeving mode and embedded into an inner cavity of the sliding block assembly. And the gear is sleeved at the tail end of the shaft rod of the thread core and is bonded with the rack. The inner threads rotate by using the front mold plate to drive the rack, the rack drives the gear to drive the inner thread mold core stirring teeth, the shovel base is used for driving the sliding block and the inner threads to return, and the inner threads and the mold core do not cause burrs, burrs and other defects of products due to return. The mold can reduce the cost investment and improve the efficiency of internal threads of most injection molding products.

Description

Technical Field

[0001] The present application relates to the field of injection molds, and in particular to an injection mold for an internal thread product. Background Art

[0002] With the continuous updating and iteration of technology in the field of plastic materials, most products with threaded connection requirements have cancelled post-processing thread, hot-melt nut and other processes, and adopted the method of directly making internal thread in the injection molded product.

[0003] In actual production, directly making internal threads in injection molded products leads to complex product processes, high scrap rates, and high costs for qualified products. The general processing method for internal threads of injection molds is to perform secondary processing on the product after injection molding, or to use a hydraulic motor to drive the internal threads and opening and closing. The first method has low production efficiency, many production processes, and a high scrap rate. The second method is that the hydraulic motor cannot accurately drive the internal threads to rotate to the mold closing position, which makes the product prone to flashing and burrs, and requires secondary processing of flashing and burrs.

[0004] The present invention reduces the number of processes, improves efficiency, increases the qualified rate and reduces costs. On the basis of the original mold, a pull plate is used to drive the screw core, and a slider mechanism controls the opening and closing of the screw core. The structure is stable and the efficiency is higher. Utility Model Content

[0005] The present application provides an injection mold for an internal thread product to reduce the number of processes, improve efficiency, increase the qualified rate, and reduce costs. The injection mold for an internal thread product includes a thread core, a slider assembly, a rack, a gear, and a preload spring;

[0006] An axial hole is provided inside the slider assembly, and the screw core passes through the axial hole; a screw structure is provided at the top of the shaft of the screw core; and the inner screw region of the injection molded workpiece is sleeved on the top of the screw core;

[0007] The preload spring is sleeved in the middle of the shaft of the thread core, and the preload spring is embedded in the inner cavity of the slider assembly;

[0008] The gear is sleeved on the end of the shaft of the screw core and is keyed with the rack. The rack is connected to the front template of the mold to drive the gear to rotate forward and reverse.

[0009] Specifically, the slider assembly includes a slider and a slider base spliced ​​with the slider, and the axial hole passes through the slider and the block base.

[0010] Specifically, a cavity is provided at the connection between the slider and the slider base. The cavity is coaxially arranged with the axial hole and has a hole diameter larger than that of the axial hole. The preload spring is arranged in the cavity.

[0011] Specifically, a core-pulling groove is provided at the position of the axial hole on the slider, the core-pulling groove is coaxially arranged with the axial hole, and the aperture is larger than the aperture of the axial hole, and the thread segment at the top of the thread core is located in the core-pulling groove.

[0012] Specifically, the inner thread area of ​​the injection molded workpiece is arranged in the core-pulling groove.

[0013] Specifically, the sliding block is provided with a protruding carrier on a side close to the injection molded workpiece, and the injection molded workpiece is mounted on the carrier.

[0014] Specifically, a first convex block is arranged on the protruding carrier, and the first convex block matches the locking hole on the injection molded workpiece.

[0015] Specifically, a second protrusion is provided on a surface of the slider that contacts the slider base, and a groove that engages with the second protrusion is provided on the slider base.

[0016] Specifically, the slider assembly also includes a shovel base, the end of the shovel base is provided with an oblique shovel arm extending downward, and the slider base is provided with an oblique hole penetrating the upper and lower surfaces, and the oblique hole matches the oblique shovel arm.

[0017] Specifically, a limiting ring is fixed on the shaft of the thread core, the limiting ring is located in the cavity and close to one end of the gear, and the preload spring is located at an end away from the gear.

[0018] The beneficial effects of the technical solution provided by the embodiment of the present application include at least: the internal thread core pulling structure is different from the traditional structure, the internal thread rotation uses the front template to drive the rack, the rack drives the gear to drive the internal thread core to stir the thread, and the return uses the shovel base to drive the slider and the internal thread, and the internal thread and the mold core will not cause burrs, flashes, etc. in the product due to the return. The mold can reduce cost investment and improve the efficiency of the internal thread of most injection molded workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an injection mold for an internal thread product provided in an embodiment of the present application;

[0020] Figure 2 This is a cross-sectional view of the injection mold for internal thread products;

[0021] Figure 3 This is a partial view of the injection mold for internal thread products;

[0022] Figure 4 This is an exploded view of the injection mold for internal thread products;

[0023] Figure 5 yes Figure 4Exploded view at A in the middle;

[0024] Figure 6 Schematic diagram of the structure of the slider and the injection mold.

[0025] Figure markings: screw core -10, limit ring -11, slider assembly -20, shaft hole -21, slider -22, carrier -221, first protrusion -222, second protrusion -223, slider base -23, groove -231, inclined hole -232, cavity -24, core pulling groove -25, shovel base -26, inclined shovel arm -261, rack -30, gear -40, pre-stressed spring -50, injection molded workpiece -60. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0027] The term "multiple" as used herein refers to two or more than two. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0028] Figure 1 : is a schematic structural diagram of an injection mold for an internal thread product provided in an embodiment of the present application, Figure 2 It is a cross-sectional view of an injection mold for an internal thread product. The injection mold for an internal thread product comprises a thread core 10, a slider assembly 20, a rack 30, a gear 40 and a preload spring 50. A transversely penetrating axial hole 21 is provided inside the slider assembly 20, and the thread core 10 passes through the axial hole 21. The top of the shaft rod of the thread core 10 is provided with a thread structure, and the tail end is connected to a transmission member, i.e., a transmission structure of the rack 30 and the gear 40. The internal thread region of the injection molded workpiece 60 is sleeved on the top of the thread core 10.

[0029] See also Figure 2 Cross-section and Figure 3 In the partial view, the preload spring 50 is sleeved in the middle of the shaft of the screw core 10, and the preload spring 50 is embedded in the inner cavity of the slider assembly 20. The gear 40 is sleeved at the end of the shaft of the screw core 10, and is keyed with the rack 30, which is connected to the front mold plate of the mold to drive the gear 40 to rotate forward and reverse.

[0030] In a possible implementation, the slider assembly 20 includes a slider 22 and a slider base 23 spliced ​​with the slider 22, the shaft hole 21 passes through the slider 22 and the block base 22, and the screw core 10 is inserted into the shaft hole 21. A cavity 24 is provided at the connection between the slider 22 and the slider base 23, and the cavity is coaxially arranged with the shaft hole 21, that is, the hole diameter is larger than the hole diameter of the shaft hole 21, and the preload spring 50 is provided in the cavity and passed on the screw core 10. The slider and the slider base are in a connected state during operation, and the preload spring and other structures are separated and taken out only when disassembly is required.

[0031] See also Figure 4 and Figure 5 In order to realize mold opening control, a core pulling groove 25 is provided at the position of the shaft hole 21 on the slider 22. The core pulling groove 25 is coaxially arranged with the shaft hole 21, and the aperture is larger than the aperture of the shaft hole 21. The thread section at the top of the thread core 10 is located in the core pulling groove 25, and the inner thread area of ​​the injection molded workpiece 60 is arranged in the core pulling groove 25. The inner thread of the injection molded workpiece 60 can mesh with the thread structure at the top of the shaft in the core pulling groove 25.

[0032] See also Figure 5 and Figure 6 The slider 22 is provided with a protruding platform 221 on the side close to the injection molded workpiece 60, and the injection molded workpiece 60 is mounted on the platform 221. A first protrusion 212 is provided on the protruding platform 221, and the first protrusion 212 matches the locking hole 61 on the injection molded workpiece 60. A second protrusion 211 is provided on the side of the slider 22 that contacts the slider base 23, and a groove 231 that engages with the second protrusion 223 is provided on the slider base 23. Both protrusion structures are for alignment and tightening during pressing. The locking hole and the protrusion are used to lock the injection molded workpiece and the slider, while the protruding platform provides support for irregular or large injection molded workpieces.

[0033] See also Figure 4 and Figure 5 The slider assembly 20 also includes a shovel base 26, and a downwardly extending carrier 221 is provided at the end of the shovel base 26. An inclined hole 232 penetrating the upper and lower surfaces is opened on the slider base 23, and the inclined hole 232 matches the carrier 221. Specifically, a limit ring 11 is fixed on the shaft of the screw core 10. The limit ring 11 is located in the cavity 24 and close to one end of the gear 40, and the preload spring 50 is located at the end away from the gear 40. The shovel base 26 is driven by the motor or the mold structure as a whole to drive the slider and the base during demolding and mold closing.

[0034] Working method: The screw core is installed on the slider and the slider base, with a preload spring installed in the middle, the rear is connected to the gear, and the rack is connected to the front mold plate of the mold. When the mold is opened, the front mold plate drives the rack, and the rack drives the gear to drive the internal screw core to rotate in the exit direction. At the same time, the preload spring applies an exit force to the internal screw core to separate the internal screw core from the injection molded workpiece. When the mold is closed, the shovel base drives the slider to return the slider and the internal screw core.

[0035] In summary, the internal thread core pulling structure is different from the traditional structure. The internal thread rotation uses the front template to drive the rack, and the rack drives the gear to drive the internal thread core to stir the thread. The return uses the shovel base to drive the slider and the internal thread. The internal thread and the mold core will not cause burrs, flashes, and other defects in the product due to the return. This mold can solve the efficient production of most mold internal threads and reduce the process, thereby reducing manpower, processing, defects, and costs.

[0036] The preferred embodiments of the present invention are described above; it should be understood that the present invention is not limited to the above-mentioned specific implementation modes, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the present invention; therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. An injection mold for an internal thread product, characterized in that: It comprises a screw thread core (10), a slider assembly (20), a rack (30), a gear (40) and a pre-compression spring (50); An axial hole (21) is provided inside the slider assembly (20), and the screw core (10) passes through the axial hole (21); a screw structure is provided at the top end of the shaft of the screw core (10); and an inner screw region of the injection molded workpiece (60) is sleeved on the top end of the screw core (10); The preload spring (50) is sleeved in the middle of the shaft of the threaded core (10), and the preload spring (50) is embedded in the inner cavity of the slider assembly (20); The gear (40) is sleeved on the end of the shaft of the screw core (10) and is keyed to the rack (30). The rack is connected to the front mold plate of the mold to drive the gear (40) to rotate forward and reverse.

2. The internal thread product injection mold according to claim 1, characterized in that: The slider assembly (20) comprises a slider (22) and a slider base (23) spliced ​​with the slider (22), and the shaft hole (21) passes through the slider (22) and the block base (23).

3. The internal thread product injection mold according to claim 2, characterized in that: A cavity (24) is provided at the connection between the slider (22) and the slider base (23); the cavity is coaxially arranged with the shaft hole (21) and has a hole diameter larger than that of the shaft hole (21); and the preload spring (50) is arranged in the cavity.

4. The internal thread product injection mold according to claim 3, characterized in that: A core-pulling groove (25) is provided at the position of the axial hole (21) on the slider (22); the core-pulling groove (25) is coaxially arranged with the axial hole (21) and has a hole diameter larger than that of the axial hole (21); and the thread segment at the top end of the thread core (10) is located in the core-pulling groove (25).

5. The internal thread product injection mold according to claim 4, characterized in that: The inner thread area of ​​the injection molded workpiece (60) is arranged in the core-pulling groove (25).

6. The internal thread product injection mold according to claim 2, characterized in that: The slider (22) is provided with a protruding carrier (221) on a side close to the injection molded workpiece (60), and the injection molded workpiece (60) is mounted on the carrier (221).

7. The internal thread product injection mold according to claim 6, characterized in that: A first convex block (222) is arranged on the protruding carrier (221), and the first convex block (222) matches the locking hole (61) on the injection molded workpiece (60).

8. The internal thread product injection mold according to claim 2, characterized in that: A second convex block (223) is provided on a side of the slider (22) that contacts the slider base (23), and a groove (231) that engages with the second convex block (223) is provided on the slider base (23).

9. The internal thread product injection mold according to claim 2, characterized in that: The slider assembly (20) also includes a shovel base (26), the end of the shovel base (26) is provided with an inclined shovel arm (261) extending downward, and an inclined hole (232) penetrating the upper and lower sides is opened on the slider base (23), and the inclined hole (232) matches the inclined shovel arm (261).

10. The internal thread product injection mold according to claim 3, characterized in that: A limiting ring (11) is also fixed on the shaft of the threaded core (10), wherein the limiting ring (11) is located in the cavity (24) and close to one end of the gear (40), and the preload spring (50) is located at the end away from the gear (40).

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