Structural Analysis Of Automobile Front Bumper

The front bumper of a car is one of the most important exterior parts of a car. It must not only have sufficient strength and rigidity to act as a buffer and protect the car body in the event of a car collision, but also pursue harmony and unity with the shape of the car body, and Realize its own lightweight. In order to achieve this purpose, the main body of the front bumper of the current car is made of plastic, commonly known as the plastic bumper, which is injection molded by an injection mold.

1. Structural analysis of plastic parts

The shape of the front bumper of a car is similar to that of a saddle, and the specific structure is shown in Figure 1. The material is PP+EPDM-T20, and the shrinkage rate is 0.95%. Among them, the Chinese name of PP is polypropylene, which is the main material of the bumper, and the Chinese name of EPDM is EPDM rubber, which can improve the elasticity of the bumper cover, and T20 refers to the addition of 20% talcum powder to the material, which can improve Rigidity of the bumper cover.

The characteristics of plastic parts are:

(1) The shape is complex, the size is large, and the wall thickness is relatively small, which belongs to large thin-walled plastic parts.

(2) Plastic parts have many punctures and insertion holes, many reinforcing ribs, and the flow resistance of the injection molding melt is large.

(3) There are three undercuts on the inner side of the plastic part, and it is quite difficult to pull the core laterally at each place.

2. Mold structure

The injection mold for the main body of the front bumper adopts an inner parting surface, passes through a hot runner, and controls the injection of glue by a sequence valve. The undercut on both sides adopts the structure of large slanted top sleeve with horizontal slanted top and straight top, the maximum external dimension is 2500×1560×1790mm

1. Fixed mold fixed plate; 2. Bearing plate; 3. Hot runner plate; 4. Positioning ring; 5. First-level hot nozzle; 6. Air valve; 7. Valve pin; .Moving mold fixing plate; 10. Square iron; 11. Push rod fixing plate; 12. Push rod bottom plate; 13. Support column; 14. Moving mold square guide column; 15. Push rod; Foot; 18. Square guide pillar for fixed mold; 19. Target plate; 20. Inclined push rod; 21, 29. Repin; ; 25, 26. Straight top; 30. Inclined push rod; 31, 39. Guard rod; 32, 33, 40, 41. Guide column; 35, 36, 37. Push rod; block; 43. side core pulling; 44. spring; 45. limit block

Taizhou Minghuang Plastic Mold Co., Ltd. is a professional Auto Bumper Plastic Injection Molds Manufacturers. If you need it, you can click the official website to contact us. We are willing to answer more information for you.