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某40 MN大型双点热模锻压力机在负荷30 MN试生产时,发生了严重的导轨磨损事故。为寻求事故原因,设计了压力机工作过程机身振动和变形的“分点测量-合成分析”的测试方案。采用激光位移传感器和数字存储示波器对高达8 m的机身6个部位分别进行了动态测量,通过合成分析获得了机身的实际振动和变形情况。机身在30 MN负荷时最大偏摆位移超过5 mm;伴随振动,机身产生了较大的横向变形,机身横向最大压缩超过1.2 mm,影响了导轨间隙,这是导致导轨磨损的主要原因。分析认为,对大型多工位压力机而言,机身变形不仅影响锻件质量,也影响压力机正常运行,应充分注意机身的刚度设计。
A 40 MN large two-point hot-die forging press at a load of 30 MN was put into production, a serious rail wear accident occurred. In order to find out the cause of the accident, a test program of “point measurement - synthesis analysis” was designed for the vibration and deformation of the fuselage during the press working. The laser displacement sensor and digital storage oscilloscope were used to measure the dynamic displacement of the fuselage up to 8 m respectively. The actual vibration and deformation of the fuselage were obtained through the synthetic analysis. The fuselage at 30 MN load maximum deflection displacement of more than 5 mm; accompanied by vibration, the fuselage had a greater lateral deformation, fuselage maximum lateral compression of more than 1.2 mm, affecting the guide rail clearance, which is the main reason leading to rail wear . Analysis, for large multi-station press, the fuselage deformation not only affects the quality of forgings, but also affect the normal operation of the press, the body should pay full attention to the rigidity of the design.