目的 采用有限元仿真建模和数值分析方法对设计的合模结构进行仿真计算,查找结构设计的薄弱位置,分析合模机构受力的稳定性,为设备持续高强度的塑料瓶合模成型工序提供稳定性和强度保障。方法 通过设备合模机构的结构设计,使该工位能够满足塑料瓶的成型、灌装、封口一体化功能;基于有限元建模仿真方法,采用实际的驱动力加载曲线对设计的合模机构进行仿真分析,用于结构优化设计,并验证结构设计的合理性。结果 合模机构的主模驱动连杆接触部位、主模动臂结构突变部位的应力过大,在对其结构进行优化设计后,主模合模力降至55 078 N,降低了0.9%,副模力降至26 769 N,降低了6.8%;对主模动臂结构突变部位进行结构改进后,最大等效应力从523.3 MPa降至244.9 MPa,降幅达到53.2%。通过结构优化改善了此2个零件的应力分布。结论 合模机构的主模驱动连杆接触部位、主模动臂结构突变部位的应力集中是整个合模机构结构设计中的薄弱点,借助有限元数值仿真方法可以有效准确地对合模机构进行模拟仿真计算分析,进而对其结构进行优化设计,从而保障了塑料瓶成型过程中合模机构工位工作的强度和稳定性。
Abstract
The work aims to simulate and calculate the designed clamping structure through finite element simulation modeling and numerical analysis, to find the weak position of the structural design, analyze the stability of the force of the clamping mechanism, and provide stability and strength guarantee for the continuous high-strength plastic bottle clamping forming process of the equipment. Through the structural design of the clamping mechanism of the equipment, the station was enabled to meet the integrated functions of forming, filling and sealing of plastic bottles. Based on the finite element modeling and simulation method, the actual driving force loading curve was used to simulate and analyze the designed clamping mechanism for structural optimization design and verify the rationality of structural design. The stress at the contact part of the main mold driving connecting rod and the mutation part of the main mold boom structure of the clamping mechanism was too large. After the structural optimization design, the clamping force of the main mold was reduced to 55 078 N, which was reduced by 0.9 %, and the clamping force of the auxiliary mold was reduced to 26 769 N, which was reduced by 6.8%. The maximum equivalent stress was reduced from 523.3 MPa to 323.9 MPa after the structural improvement of the structural mutation site of the main mold boom, with a decrease of 11.71%. The stress distribution of these two parts was improved by structural optimization. The stress concentration at the contact part of the main mode drive connecting rod and the sudden change part of the main mode boom structure of the clamping mechanism is the weakest point in the structural design of the whole clamping mechanism. With the help of finite element numerical simulation method, the simulation calculation and analysis of the clamping mechanism can be effectively and accurately carried out, and then the structure can be optimized and improved to ensure the strength and stability of the clamping mechanism in the plastic bottle forming process.
关键词
有限元 /
合模机构 /
静强度 /
优化迭代
Key words
finite element /
clamping mechanism /
static strength /
optimization iteration
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