供应

为了减少系统的早期失效，机床制造厂可以对控制元件进行筛选，即使每台元件在实际使用条件下连续工作一定次数，把失效产品排除，以减少装到系统中的元件早期失效。元件进入耗损失效期以后，失效率将明显上升。为了防止这种情况影响系统的可靠性，可以在有效寿命（或偶然故障期）将结束时，不管元件是否损坏，也进行更换。采用筛选和预防性更换，可以保证系统中的元件工作在偶然失效期内，在这个前提下才可以用元件的偶然失效率来计算系统的失效率。

在选择方案时，应考虑尽量减少控制元件数、接点数和焊点数，以降低系统的失效率。采用可编程控制器（PC）来代替由继电器等组成的控制柜可以提高系统的可靠性。在比较可编程序控制器和继电器控制柜两种方案时，除了购置价格以外，还应充分估计前者在提高可靠性、缩短开发周期和减小工作量以及节省维修时间等有利因素。

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