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针对锚固装置中的锚套典型件,设计了自动化热挤压工艺。试生产中出现锻件质量不稳定和模具寿命太低等问题,导致难以实现自动化生产。质量不稳定的表现是锻件同轴度超差且无规律,模拟分析了预锻同轴度对成形凸模等效应力和偏移量的影响,并通过提高坯料尺寸精度和调整镦粗高度解决了同轴度的问题,使锻件同轴度从最大Φ0.86 mm减小到Φ0.4 mm以内,确保了锻件质量稳定合格。成形凸模失效的表现是磨损,模拟分析了不同材料、润滑系数、凸模长径比对模具磨损量的影响,并通过实验确定:润滑剂采用水基石墨,凸模材料采用3Cr2W8V钢,将模具寿命从1500件提高到10000件以上,可以连续生产20 h以上。最终实现班产不换模具且无废品,达到自动化生产的要求。
An automatic hot extrusion process is designed for the typical anchor sleeve in the anchorage device. Forgings in the trial production of unstable quality and mold life is too low and other issues, resulting in difficult to achieve automated production. The instability of the quality is that the coaxiality of the forging is out of order and irregular. The influence of the pre-forging coaxiality on the equivalent stress and offset of the forming punch is simulated and analyzed, and the blank dimensional accuracy and the upsetting height are adjusted The problem of coaxiality, so that forgings coaxial from the largest Φ0.86 mm reduced to Φ0.4 mm or less, to ensure the quality of forging stable. The performance of forming punch failure is wear, simulation analysis of the impact of different materials, lubrication coefficient, punch aspect ratio on the tool wear and tear, and determined by experiments: lubricant using water-based graphite, punch material 3Cr2W8V steel, Die life from 1500 to more than 10,000 pieces, you can continuously produce more than 20 h. The ultimate realization of the production does not change mold and no scrap, to meet the requirements of automated production.