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压力机工作时,立柱拉紧螺栓将在拉力作用下伸长,这样会使机身各部件装配面间产生间隙,影响设备正常工作。为此,必须先将螺栓加热使之伸长后,再把螺母拧紧。冷却后而收缩产生一个预应力。其伸长度应大于压力机以最大压力工作时螺栓产生的伸长度。根据我厂经验证明,采用火焰加热法时,四根拉紧螺栓由于加热不匀,产生的予应力不一样,使用一段时间后,有松动现象,有的甚至使机床本身变形,影响压力机的精度。
Press work, the column tension bolts will be stretched under the action of tension, this will make the fuselage assembly of the various parts of the gap between the assembly surface, affecting the normal operation of equipment. To do this, you must first heat the bolt to make it elongate, then tighten the nut. After cooling and shrink to produce a prestress. Its elongation should be greater than the maximum pressure when the press work bolt elongation. According to our factory experience shows that the use of flame heating method, the four tension bolts due to uneven heating, the pre-stress is not the same, the use of a period of time, there are loosening, and some even make the machine itself deformation, affecting the press Accuracy.