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本文介绍了一种用于车削的快速落刀装置。利用爆炸产生的气压剪断四个辅剪切销,使冲块自由飞行一段短的距离,在气压近似地达到最大值时,冲击夹刀块剪断主剪切销,使刀具突然快速地从切削区脱开,达到断开切削作用的目的。由于撞击夹刀块的能量包括爆炸气压和冲块的动能两项,所以夹刀块能获到很大的初始加速度。根据高速摄影技术测定的刀具从切削区脱开的时间——位移特性,计算出头160μs内的平均初始加速度为3.3×10~8mm/s~2,在3.3m/s的切削速度下,分离时间为1×10~(-5)s,分离长度<0.02mm,达到了设计要求。
This article describes a quick drop-off device for turning. Using the air pressure generated by the explosion to cut four auxiliary shear pins, the free-flight block runs for a short distance. When the air pressure reaches approximately the maximum value, the impact clamp cuts the main shear pin, causing the tool to suddenly and quickly move from the cutting zone Off, to cut off the purpose of cutting. Since the energy of the impact clip includes both the explosion pressure and the kinetic energy of the punch, the clip can achieve a great initial acceleration. According to the time-displacement characteristics of the tool disengaged from the cutting zone measured by high-speed photography technology, the average initial acceleration within the first 160 μs is calculated to be 3.3 × 10 -8 mm / s ~ 2. Under the cutting speed of 3.3 m / s, the separation time 1 × 10 ~ (-5) s, separation length <0.02mm, which meets the design requirements.