我厂1250吨锻造水压机是太原重机厂1959年制造,其两侧缸柱塞与活动横梁联结采用球形连接方式,其结构见简图1。在使用过程中,联接螺钉2(M56)经常折断,使侧缸柱塞与活动横梁分离,严重影响生产。经分析:活动横梁向下运动时,其受力主要是克服柱塞的密封阻力,即使不考虑低压充液压力,也不至于引起联接螺钉断裂,而折断的主要原因是活动横梁在加压过程中,由于倾斜产生弯曲及剪切力所致。如能消除这部分作用力,情况将会改变,因此, Our 1250 ton forging hydraulic press is manufactured by Taiyuan Heavy Machinery Factory in 1959. The cylinder plunger on both sides and the movable beam are connected by a spherical connection, and its structure is shown in Fig. 1. During use, the connecting screw 2 (M56) is often broken, so that the side cylinder plunger and movable beam separation, seriously affecting the production. The analysis: When the moving beam moves downward, the force is mainly to overcome the plunger seal resistance, even if the pressure is not considered low pressure, it will not cause the joint screw fracture, and the main reason for the break is the moving beam in the compression process Due to bending and shear due to tilt. If we can eliminate this part of the force, the situation will change. Therefore,