Plastic Auto Bumper Moulding

A car bumper is a safety device that absorbs and mitigates external impact and protects the front and rear of the vehicle body. Generally consists of plastic bumpers, cushioning materials, and beams. Plastic bumpers have strength, rigidity, and decorativeness. From a safety point of view, a car can play a buffering role in the event of a collision and protect the front and rear body. From the appearance, it can be naturally integrated with the car body. One body, with very good decoration, has become an important part to decorate the appearance of the car.

Requirements for bumper mould steel

The fixed mould uses 718H, the pre-hardness is 30-35HRC, and the moving mould uses P20 or 718H, and the hardness is 30-33HRC. The AB board adopts the form of surrounded by four sides, and the mould has good strength. The size of the bumper mould is large, and it is difficult to process and match the mould. The cavity has a multi-faceted angle. The depth of the A-plate cavity is 710mm. The wool weight is about 30T. After finishing, it still reaches 20T. It cannot be processed with conventional tools and equipment. Non-standard tools and large 5-axis machine tools must be ordered to solve the above problems. Plate B weighs about 12T, the large inclined top on both sides weighs about 1.2T, and the large square top on both sides weighs about 2.3T. All the main parts weigh more than 1 ton, making it difficult for the fitter to assemble. The design life of the mold needs to reach more than 300,000 times.

Bumper mould ejection system requirements

Bumpers are large automotive exterior parts, and demolding must be smooth, safe, and reliable. The ejection mold in the bumper is divided into three stages. The first stage ejection uses 4 nitrogen spring ejectors to move out of the mould synchronously with the fixed mould, and 4 pull hooks are auxiliary mechanisms. The second stage ejects and then The nitrogen spring continues to eject a certain distance; the third stage ejection uses two hydraulic oil cylinders to do a second ejection for a certain distance, which is convenient for taking parts.