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一、慨述过去由于受刀具切削性能的限制,车床主轴转速都在2500r/min以下,此时卡盘均能夹持工件,可正常地工作。现在,由于刀具不断发展,主轴转速在不断提高,特别是数控车床的主轴转速可高达6300r/min,这样就使卡盘上卡爪的离心力骤增,严重地影响了加工安全。据国外资料介绍(图1),当卡盘的静态夹紧力F_8定值时,其动态夹紧力F_dv,与转速n之间的关系为:F_dv=F_8-kn~2 (1) 式中:k为与离心力有关的计算系数。研究表明,当卡盘转速为1500～2000r/min时,其夹紧力下降15～20％;转速为3000～3500r/min时,下降40～60％;转速为7000r/min时,夹紧力几乎为
First, the generous statement in the past due to cutting tool performance constraints, lathe spindle speed are below 2500r / min, then the chuck can hold the workpiece, can work properly. Now, as the tool continues to develop, the spindle speed is constantly rising, especially the spindle speed of CNC lathe up to 6300r / min, so that the chuck on the chuck centrifugal force surge, seriously affecting the processing safety. According to the introduction of foreign materials (Figure 1), when the chuck static clamping force F_8 value, the dynamic clamping force F_dv, and the relationship between speed n: F_dv = F_8-kn ~ 2 (1) : k is the centrifugal force related calculation coefficient. The research shows that when the chuck speed is 1500-2000r / min, the clamping force is reduced by 15-20%; when the rotation speed is 3000-3,500r / min, it drops by 40-60%; when the rotation speed is 7000r / min, the clamping force Almost for