The Design and Manufacturing Process of a Car Bumper Mould

Car bumpers are important safety parts of vehicles. They can be made from a variety of materials. These bumpers are also decorative pieces. The design and manufacturing process of a bumper mould plays a significant role in the production of an auto bumper. In order to ensure the quality and durability of a bumper, a lot of factors should be taken into consideration.

For instance, the car bumper mold requires an injection molding machine. It is able to produce 2,500 parts per year. A hot runner sequence valve is used in the molding process. This valve is equipped with a secondary timer. When the optimum preset time is reached, the positive closure of the valve is set.

Bumper molding manufacturers take every step of the bumper mold manufacturing process seriously. The first step in the manufacturing process is the design of the mold. With the help of computer simulation, the mold can be quickly analyzed. Based on the results, the design of the gates can be determined.

Another stage is the design of the cooling system. The design of the cooling water circuit is very important. Uneven cooling can lead to warpage and deformation. To avoid this, a conformal cooling water circuit is arranged. This can shorten the molding cycle and improve the molding quality.

The inner parting line is a parting surface that is set on the non-appearance surface of the rounded corners of the bumper. It is the largest contour line on the main drawing direction. However, the surface quality is low or non-visible. Using an inner parting mold can avoid the problem of parting lines. However, the costs are higher. There are two types of internal parting: a straight top and a three-plate mold.

The cost of the mold is higher than the outer parting one, but the ejection mechanism is simple. The main advantage of an inner parting mold is that the product will not be affected by the parting line. The mold is often filled with water during installation and disassembly. During the manufacturing process, the nozzles may be blocked by contaminants in the melt stream. Therefore, it is important to maintain the nozzles at a certain temperature. If the nozzles are not heated, the sealing glue can be clogged.

The runnerless bumper mold is often preferred for large multigated parts. Runnerless molds can reduce the mold cost. A bumper mould can be designed with the help of CADCAE technology. CADCAE can also help solve problems and produce qualified products. The hot runner heating system is provided by a company. Compared with a fixed mold temperature, the dynamic temperature is 5degC higher. This is beneficial for the elimination of tiger skin patterns. Moreover, a low rate of fire can be adopted.

The mold can be manufactured on an HTF3300 injection molding machine. Before applying oil, the mold should be dried thoroughly. It is advisable to perform a rust prevention process on the molding part. Car bumper molds have high appearance and performance requirements. Therefore, it is necessary to pay attention to the design of the mold and the parts. Also, the design of the gating system is very crucial.