Front mold assembly of external thread parting-line-free injection mold for injection-molded part

Abstract

The utility model relates to a front mold assembly of an external thread parting-line-free injection mold for an injection-molded part, which comprises a front mold bottom plate, a front mold connecting plate, a front mold plate and a front mold block, a front mold accommodating cavity is formed in the center of the rear side of the front mold plate, and a screw mouth forming assembly is arranged in the front mold plate. The screw forming assembly comprises a driving base, a driving gear, a demolding base, a guide screw sleeve, a screw mold core, a guide sleeve, a thread forming column and a demolding driving assembly, the thread forming column is provided with a demolding thread and a driven gear, the tail end of the thread forming column is provided with a forming thread, and the thread pitch of the demolding thread is the same as that of the forming thread. The thread is formed by rotating the telescopic thread forming column, the thread position of an injection molding part is not provided with a parting line, the thread forming quality is high, and the thread cannot be damaged during demolding. The thread is formed by rotating the telescopic thread forming column, the thread position of an injection molding part is not provided with a parting line, the thread forming quality is high, and the thread cannot be damaged during demolding.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a front mold assembly for an injection mold without parting line for external threads of injection molded parts. Background Technology

[0002] Due to the numerous excellent properties of plastics, especially their ease of molding, they are widely used in the field of complex-shaped parts. Threaded connections are a common type of connection, and existing methods for molding plastic threads are generally divided into two-part molding or one-piece forced-release molding. Two-part molding results in parting lines and poor thread quality. One-piece forced-release molding typically requires shallow thread depth and high elasticity of the injection molded part; otherwise, the threads are easily damaged during demolding. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a front mold assembly for injection molding with no parting line for external threads on injection molded parts.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a front mold assembly for an injection mold without parting line for an external thread of an injection molded part, including a front mold base plate, a front mold connecting plate disposed on the rear side of the front mold base plate, a front mold template disposed on the rear side of the front mold connecting plate, and a front module disposed on the front mold template. A front mold receiving cavity for accommodating the front module is provided at the center of the rear side of the front mold template. A thread forming assembly is provided inside the front mold template. The thread forming assembly includes a drive base disposed on the front mold connecting plate, a drive gear rotatably connected to the drive base, a demolding base connected to the front mold connecting plate, a guide screw sleeve disposed on the demolding base, and a guide screw sleeve disposed on the demolding base. The assembly includes a threaded die core on the base, a guide sleeve on the front module, a threaded forming column slidably connected to the guide sleeve, and a demolding drive assembly driven by the drive gear. The threaded forming column has a demolding thread that engages with the guide sleeve, a driven gear that meshes with the drive gear, and a forming thread at the tail end of the threaded forming column. The threaded die core is coaxial with the threaded forming column and the guide sleeve, and the threaded die core passes through the guide sleeve and the threaded forming column sequentially. The rear end of the threaded forming column extends to the forming surface of the front module, and the demolding thread has the same pitch as the forming thread.

[0005] As a further improvement to this design, the guide sleeve is fixedly connected to the front module, and the rear side of the front module is provided with a guide receiving hole for accommodating the guide sleeve. The guide receiving hole is a stepped hole, a non-circular hole, and the rear end of the guide receiving hole is a large hole. The outer wall of the guide sleeve fits against the wall of the guide receiving hole.

[0006] As a further improvement to this design, the rear end of the guide receiving hole is a tapered hole, and the rear end of the outer periphery of the guide sleeve is provided with a tapered surface that fits into the tapered portion of the guide receiving hole.

[0007] As a further improvement to this design, the guide screw sleeve is coaxially provided with an adjusting toothed ring, and the front template is detachably connected with an adjusting toothed block that meshes with the adjusting toothed ring. The guide screw sleeve is rotatably connected to the demolding base.

[0008] As a further improvement to this design, a grease groove is provided on the outer circumferential surface of the threaded forming post that mates with the guide sleeve.

[0009] As a further improvement to this design, the demolding drive assembly includes a guide strip disposed between the front mold connecting plate and the front template, a drive fixing seat disposed on the side of the front template, an adjustment pad disposed on the side of the drive fixing seat opposite to the front template, a drive cylinder disposed on the adjustment pad, a drive rack connected to the cylinder rod of the drive cylinder, and a transmission gear coaxially disposed with the drive gear. The transmission gear meshes with the drive rack, and the drive rack slides with the guide strip.

[0010] As a further improvement to this design, the drive rack has an I-shaped cross-section.

[0011] The beneficial effects of this utility model are: this utility model forms threads by rotating and telescopic thread forming column, there is no parting line at the thread position of the injection molded part, the thread forming quality is high, and the threads will not be damaged during demolding. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention without a screw core and a threaded forming column.

[0014] Figure 2 This is a three-dimensional structural diagram of the front template and front module of the enclosure panel of this utility model.

[0015] Figure 3 This is a schematic cross-sectional view of the present invention.

[0016] In the diagram: 1. Front mold connecting plate, 2. Front mold base plate, 3. Front template, 4. Drive cylinder, 5. Adjusting pad, 6. Drive fixing seat, 7. Conical surface, 8. Front module, 9. Transmission gear, 10. Adjusting gear ring, 11. Adjusting gear block, 12. Guide screw sleeve, 13. Drive gear, 14. Guide strip, 15. Drive rack, 16. Threaded mold core, 17. Guide sleeve, 18. Driven gear, 19. Demolding thread, 20. Front mold receiving cavity, 21. Demolding base, 22. Drive base, 23. Thread forming column, 24. Guide receiving hole, 25. Forming thread. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. Example

[0018] Please see Figure 1 This embodiment provides a front mold assembly for an injection mold without parting line for an external thread of an injection molded part. It includes a front mold base plate 2, a front mold connecting plate 1 disposed on the rear side of the front mold base plate 2, a front mold template 3 disposed on the rear side of the front mold connecting plate 1, and a front module 8 disposed on the front mold template 3. A front mold receiving cavity 20 for accommodating the front module 8 is provided at the center of the rear side of the front mold template 3. A thread forming assembly is provided within the front mold template 3. The thread forming assembly includes a drive base 22 disposed on the front mold connecting plate 1, a drive gear 13 rotatably connected to the drive base 22, a demolding base 21 connected to the front mold connecting plate 1, a guide thread sleeve 12 disposed on the demolding base 21, a thread mold core 16 disposed on the demolding base 21, and a thread forming core 16 disposed on the front mold. The block 8 includes a guide sleeve 17, a threaded forming column 23 that is slidably connected to the guide sleeve 17, and a demolding drive assembly that is driven by the drive gear 13. The threaded forming column 23 is provided with a demolding thread 19 that is threadedly engaged with the guide sleeve 12. The threaded forming column 23 is provided with a driven gear 18 that meshes with the drive gear 13. The tail end of the threaded forming column 23 is provided with a forming thread 25 for forming. The threaded die core 16 is coaxial with the threaded forming column 23 and the guide sleeve 12 respectively. The threaded die core 16 passes through the guide sleeve 12 and the threaded forming column 23 in sequence. The rear end of the threaded forming column 23 passes through to the forming surface of the front module 8. The demolding thread 19 and the forming thread 25 have the same pitch.

[0019] The aforementioned thread-forming column, which uses rotation and telescopic movement to form threads, results in no parting line at the thread position of the injection molded part, high thread forming quality, and no damage to the threads during demolding.

[0020] Please see Figure 3To prevent the guide sleeve 17 from rotating and causing the threaded forming column 23 to slide unevenly, the guide sleeve 17 is fixedly connected to the front module 8. The rear side of the front module 8 is provided with a guide receiving hole 24 to accommodate the guide sleeve 17. The guide receiving hole 24 is a stepped hole and a non-circular hole. The rear end of the guide receiving hole 24 is a large hole. The outer wall of the guide sleeve 17 fits against the hole wall of the guide receiving hole 24.

[0021] Please see Figure 3 To prevent the material from entering the guide receiving hole 24 during injection molding, the rear end of the guide receiving hole 24 is a tapered hole, and the outer periphery of the guide sleeve 17 is provided with a tapered surface 7 that fits with the tapered hole portion of the guide receiving hole 24.

[0022] Please see Figure 2 In order to facilitate the adjustment of the rotation angle of the threaded forming column 23 when the mold is closed, the guide screw sleeve 12 is coaxially provided with an adjustment tooth ring, and the front template 3 is detachably connected with an adjustment tooth block 11 that meshes with the adjustment tooth ring. The guide screw sleeve 12 is rotatably connected to the demolding base 21.

[0023] Please see Figure 3 In order to improve the smoothness of the sliding of the threaded forming column, a grease groove is provided on the outer peripheral surface of the threaded forming column 23 that mates with the guide sleeve 17.

[0024] Please see Figure 1 and Figure 2 The demolding drive assembly includes a guide strip 14 disposed between the front mold connecting plate 1 and the front template 3, a drive fixing seat 6 disposed on the side of the front template 3, an adjusting pad 5 disposed on the side of the drive fixing seat 6 opposite to the front template 3, a drive cylinder 4 disposed on the adjusting pad 5, a drive rack 15 connected to the cylinder rod of the drive cylinder 4, and a transmission gear 9 coaxially disposed with the drive gear 13. The transmission gear 9 meshes with the drive rack 15, and the drive rack 15 slides with the guide strip 14. By utilizing the engagement of the transmission gear, drive gear, and driven gear, and the selection of the adjusting pad 5, the drive cylinder can be disengaged within one stroke, reducing the need for sensors.

[0025] Please see Figure 3 In order to ensure the normal meshing of the drive rack 15 and the transmission gear 9, the cross section of the drive rack 15 is I-shaped, which facilitates the lateral guidance of the drive rack 15.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A front mold assembly for an injection mold with an external thread and no parting line, comprising a front mold base plate, a front mold connecting plate disposed on the rear side of the front mold base plate, a front mold template disposed on the rear side of the front mold connecting plate, and a front module disposed on the front mold template, characterized in that, The front mold plate has a front mold receiving cavity at its rear center to accommodate the front module. The front mold plate contains a threaded forming assembly, which includes a drive base mounted on the front mold connecting plate, a drive gear rotatably connected to the drive base, a demolding base connected to the front mold connecting plate, a guide sleeve mounted on the demolding base, a threaded mold core mounted on the demolding base, a guide sleeve mounted on the front module, a threaded forming column slidably connected to the guide sleeve, and a demolding drive assembly driven by the drive gear. The threaded forming column has a demolding thread that engages with the guide sleeve, a driven gear that meshes with the drive gear, and a forming thread at its tail end. The threaded mold core is coaxial with both the threaded forming column and the guide sleeve. The threaded mold core extends rearward through the guide sleeve and the threaded forming column, with the rear end of the threaded forming column extending to the forming surface of the front module. The demolding thread and the forming thread have the same pitch.

2. The injection mold front mold assembly for an external threaded injection molded part without parting line as described in claim 1, characterized in that, The guide sleeve is fixedly connected to the front module. The rear side of the front module is provided with a guide receiving hole for accommodating the guide sleeve. The guide receiving hole is a stepped hole and a non-circular hole. The rear end of the guide receiving hole is a large hole. The outer wall of the guide sleeve fits against the wall of the guide receiving hole.

3. The front mold assembly for an injection mold with an external thread and no parting line as described in claim 2, characterized in that, The rear end of the guide receiving hole is a tapered hole, and the rear end of the outer periphery of the guide sleeve is provided with a tapered surface that fits into the tapered hole portion of the guide receiving hole.

4. The front mold assembly for an injection mold with an external thread and no parting line as described in claim 1, characterized in that, The guide screw sleeve is coaxially provided with an adjusting toothed ring, and the front template is detachably connected with an adjusting toothed block that meshes with the adjusting toothed ring. The guide screw sleeve is rotatably connected to the demolding base.

5. The front mold assembly for an injection mold with an external thread and no parting line as described in claim 1, characterized in that, The outer circumferential surface of the threaded column that mates with the guide sleeve is provided with a grease groove.

6. The front mold assembly for an injection mold with an external thread and no parting line as described in claim 1, characterized in that, The demolding drive assembly includes a guide strip disposed between the front mold connecting plate and the front template, a drive fixing seat disposed on the side of the front template, an adjustment pad disposed on the side of the drive fixing seat opposite to the front template, a drive cylinder disposed on the adjustment pad, a drive rack connected to the cylinder rod of the drive cylinder, and a transmission gear coaxially disposed with the drive gear. The transmission gear meshes with the drive rack, and the drive rack slides with the guide strip.

7. A front mold assembly for an injection molded part with an external thread and no parting line, as described in claim 6, is characterized in that... The drive rack has an I-shaped cross-section.

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