连杆无飞边锻造工艺及模具系统研究

Flashless Forging Process and Tool System of Connecting Rod

目的研究连杆无飞边锻造工艺,以及闭模锻造过程中中间工序件的设计和所需的模具系统。方法通过建立有限元模型,分析连杆的预锻和终锻过程中金属流动长度、成形载荷和模具寿命,为模具设计提供数据支持。结果数值模拟结果表明金属充模效果良好;连杆大端主要在预锻中成形,而连杆小端和杆部主要在终锻中成形;预锻和终锻的最大成形载荷分别为437 t和850 t;连杆大端的模腔圆角为模具失效危险区。结论通过辊锻制坯、预锻分配物料和终锻精密成形,实现了连杆的无飞边锻造。

Objective To investigate the flashless forging process connecting rod, as well as the design of intermediate goods and the die system needed for closed-die forging. Methods Finite element model was estimated to analyze the metal flowing path during pre and final forging, forming load and tool life, which provided data support for the tool design. Re-sults Results of numerical simulation showed that： the metal die-filling was desired; the big end of connecting rod was mainly formed in the pre-forging, whereas small end and stem were mainly formed in the final forging; the maximum form-ing loads of pre and final forging were 437 t and 850 t, respectively; the dangerous zone of tool failure occurred at the big end of connecting rod in the cavity. Conclusion Through rolling for blank preparation, pre-forging for materials distribu-tion and final forging for precision forming, flashless precision forging for connecting rod was achieved.