Research On Processing Technology Of Pet Bottle Blow Mold Cavity Parts

To solve the problem of inefficiencies in the PET bottle blow mold production processing and mismatch of the mold quality with the imported equipment requirements, the analysis on the PET bottle blowing process and the mold working conditions are conducted in this project, and the processing technology of cavity parts for Israel bottle blow mold equipped by KRONES H24bottle manufacturing equipment is studied. Appropriate cutting angles and special fixture for lathe machining of the cavity parts of the back semi-cylindrical were designed. The Experiments show that not only the surface roughness of the manufactured parts meets the technology requirements, but also the production efficiency of the process improved by61%.In order to improve the processing efficiency of the blow mold cavity surface, a new scheme incorporated with roughing and semi-finishing machining is proposed. By the in-depth analysis of the overlap processing areas and area delineating in root clearing during the finishing process, the software Tebis is introduced to solve the technological problems. The new scheme improves the processing efficiency of the blow mold cavity by more than20%, which shortens the production cycle and improves the competitiveness of the enterprise.Specifically for the finishing process of blow mold cavity surface, the impact law of the high-speed machining cutting parameters of1.2085Groditz mold steel on the surface roughness was analyzed by single factor milling experiments in this study. The high-speed machining parameters was optimized by orthogonal experiments and constant metal removal rate experiments respectively, and a surface roughness prediction model of quadratic polynomial with constant terms, one-time items and cross terms was established.The optimized high-speed machining parameters were applied to the machining of Israel bottle blow mold cavity surfaces, and an average surface roughness of0.3368μm was acquired, which is consistent with the results of the surface roughness prediction model and significantly better than the average surface roughness of Ra0.844μm with conventional cutting parameters. This technology will be able to greatly reduce the workload of the cavity surface polishing, shorten the production cycle and reduce the production cost.