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本文分析了压力机半圆形转键离合器的工作情况。提出设计离合器时,应首先确定转键最佳工作转角,再校核转键强度,以便充分发挥离合器主要零件转键与中套的承载能力。按转键弯曲强度裕度和中套的挤压强度裕度相等的概念,推导了确定转键最佳工作转角的理论公式。指出现有压力机转键工作转角若从现在的45°减小到28°—31°,则可充分发挥离合器的承载能力,减小转键的弯曲变形,提高挤压应力的均匀性。并指出现有转键离合器能提供的制动角很小,导至压力机曲轴上允许的制动角仅有1.3°～5.2°,这对制动器设计和工作不利,应修改现有转键离合器的主要尺寸,使离合器能提供较大的制动角,以改善制动器的工作条件,提高压力机的效率。
This article analyzes the press semi-circular key clutch operation. Proposed design of the clutch, you should first determine the best working corner turn key, and then check the key switch strength, in order to give full play to the clutch key components and the sleeve in the carrying capacity. According to the concept that the bending strength of the key switch is equal to the margin of the compression strength of the middle sleeve, the theoretical formula for determining the optimal working angle of the key switch is deduced. It is pointed out that if the working angle of the existing press turning key is reduced from the current 45 ° to 28 ° -31 °, the carrying capacity of the clutch can be fully utilized to reduce the bending deformation of the turning key and improve the uniformity of extrusion stress. It is pointed out that the braking angle provided by the existing key-operated clutch is small, and the allowable braking angle on the crankshaft of the press is only 1.3 ° -5.2 °, which is unfavorable for brake design and work. The existing key clutch The main dimensions, so that the clutch can provide a larger braking angle to improve the working conditions of the brake and improve the efficiency of the press.