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零件加工时的注意事项

 (1)固定进刀退刀模式
每把车刀从换刀点以G0模式运动到进刀点,进刀点应在X、Z两个方向离工件有一定距离,太远太近都不行。太远会增加G01进给的空行程,造成加工效率低;太近会增加安全隐患。进刀时(从起刀点到加工开始点)必须以G01方式进刀,退刀时必须以G01方式退到退刀点(退刀点距离工件有一定的安全距离)后再以G0方式运动。
(2)换刀点设定??榛?BR>换刀点的设定关系到加工的效率和安全问题?;坏兜闵璧锰?,刀具从换刀点运动到进刀点的时间就会加长,降低了效率;若太近,在换刀时就可能会和工件发生干涉,造成刀具、工件及机床的损坏。因此,自己设定换刀点,该点就可能被设得或远或近,所以我根据刀具及工件的实际情况用子程序把换刀点固定下来,换刀时只需将刀具回到退刀点,然后调用子程序即可,这样事故发生率就大大降低了。 
(3)养成规范的调试动作
①.我们必须把G0速度选择开关打在F0挡上,让刀具以较慢的速度靠近工件,否则,如果刀具的刀偏值有误的话,刀具从换刀点以G0方式极快地运动到进刀点时,可能会与工件发生强烈的碰撞,让操作者无所适从,来不及排除险情;相反我们让刀具以较慢的速度靠近时,即使刀偏值有误,我们也有充裕的时间来调整。
②在调试时,必须使机床处于单步执行状态。操作者在机床执行上一句语句后,必须再次检查下一句的正误性和合理性,并相应作出调整?;苍谠硕?,操作者必须时刻观察屏幕上刀具坐标的变化和程序中的运动终点坐标与刀具实际运动坐标是否一致。
③调试过程中,操作者可将一只手指放在循环开始按钮上,另一只手指放在循环保持按钮边,以便在紧急时刻能及时停止程序的执行。另外时刻记住紧急按钮的位置,以便不时之需。 以上做法是为了减少在数控车中由于编程和操作不当而造成对数控车床的损害,减少事故的发生,确保工作、实习的安全性。
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