Abstract:

According to the design requirements of a straight pipe mouth double shrink water chamber in the heat⁃exchange system， a detailed process plan was proposed to form the part using a thermoplastic composite based on the PA66 matrix and 30 wt% glass fiber （GF）. This plan included the plastic component characteristic analysis， structural design， working principle， and pre⁃deformation technology of products. The key technologies for the design of the water chamber and the pre⁃deformation of products were studied. Through multiple verifications， the optimal mathematical model for the nozzle water chamber product was designed， and corresponding injection molds were developed. The research results indicated that the structural design of the double shrink Ke slider achieved a significant improvement in the mold space utilization and plastic forming quality. This design makes the mold space more compact and improves the production efficiency. Meanwhile， the optimized structure reduces the molding defects of the plastic parts， ensuring the stability of product quality. By using the PA66/30 wt% GF composite and mold design scheme， the original metal parts were replaced by the plastic parts， which greatly reduced the processing and material costs. Such a lightweight design not only reduces the weight of the entire vehicle， but also improves the vehicle's endurance. This study provides an effective approach for the technological development and engineering practice in related fields.

Key words: molding process, double reduction ke slider mechanism, structural principle, pre deformation design