Telephone Microphone Injection Mold Design

Time：2025-03-15 08:16:48 / Popularity： / Source：

Telephone is an indispensable electronic product in people's daily life. Although market share of telephones has declined with rapid development of mobile phone industry, it is still used very frequently in company's administrative office. Design of telephone microphone pays attention to smooth lines, and curved shape should be easy for users to grasp. This case introduces structural explanation and design points of a certain brand of telephone microphone mold design.

1 Appearance requirements and structural analysis of plastic parts

Figure 1-1 Telephone microphone shell parts Figure 1-2 Telephone microphone bottom shell parts
Figure 1-1. Figure 1-2 is a certain brand of telephone microphone shell bottom shell parts, material is ABS, shrinkage rate is 1.005, shell weight is 31g, bottom shell weight is 44g, appearance requirements and structural analysis of plastic parts are as follows:
① Appearance requirements are high, and appearance surface of plastic parts is not allowed to have spots, gate marks, shrinkage depressions, welding marks, flash and other defects.
② Surface of part has fine sun grains, grain number is MT-11010, appearance surface demolding angle is designed to be at least 2 degrees to prevent plastic parts from sticking to fixed mold and dragging.
③ In order to prevent deformation and meet requirements of its own functions, more reinforcing ribs are designed for plastic parts. For reinforcing ribs exceeding 10mm, mold needs to consider inserts for exhaust and EDM.
④ In order to control deformation of plastic parts and shorten injection molding cycle, cooling water channel design of fixed mold and movable mold must be uniform and reasonable.
⑤ Plastic part has 4 slider core pulls and 4 inclined top core pulls, especially front mold inner core pull S3 and rear mold inner core pull S4. This is difficulty of this set of mold design, which needs to take into account many things and is also focus of this article.

2 Analysis of mold casting system

According to our previous mature cases of telephone microphone molds, because appearance of plastic parts cannot have glue injection marks, telephone microphone adopts two-plate mold large water gate cold runner to submerge glue injection. Because parting surface heights of two-hole products are different, runner is designed as a trapezoidal runner for easy processing and mold matching.

Figure 1-2 Telephone microphone casting system

3 Analysis of classic mold structure

Figure 1-3 Telephone microphone mold structure diagram

Figure 1-4 Telephone microphone mold structure diagram

1. Panel 2. A plate 3. B plate 4. Square iron 5. Push rod fixing plate 6. Push rod bottom plate 7. Bottom plate 8. Limit screw 9. Lock module 10. Nozzle 11. Nylon plug 12. Ball screw 13. Headless screw 1 14. Ejector hole insert 15. Guide column 16. Cooling nozzle 17. Moving mold insert 18. Moving mold insert 19. Headless screw 20. Oblique pin 21. Oblique pin slider 22. Oblique pin seat 23. Push tube 24. Push tube pressure block 25. Bent pin 1 26. Slider insert 1 27. Slider seat 1 28. Return spring 1 29. Headless screw 2 30. Slider wear block 31. Oblique pin guide block 32. T-block 1 33. T-block 2 34. Slider in fixed mold 35. Return spring 2 36. Bent pin 2 37. Slider 38. Bend pin wear block 1 39. Slider bottom wear block 1 40. Bend pin 3 41. Return spring 3 42. Slider bottom wear block 2 43. Slider limit screw 44. Slider seat 2 45. Bend pin wear block 2 46. Slider inlay 2
Figure 1-5 Telephone microphone slider structure diagram

Figure 1-6 Telephone microphone dynamic mold inner slider structure diagram

Figure 1-6 Telephone microphone fixed mold inner slider structure diagram

Gud Mould Industry Co., Ltd