前言在以往的生产活动中,我们曾经遇到这样一些问题: 加工时产生的一部份热量使工件温度升高。因此,工件温度t_2高于室温、高于测量工具的温度t_1。为了保证制件尺寸,通常待工件冷到室温或接近室温时测量。为了提高生产率,就得减少等待工件冷却的时间。有经验的工人可以既保证产品质量又有高的生产率。他们经常是不等零件完全冷下来就进行测量,然 Foreword In the past production activities, we have encountered some problems: a part of the heat generated during processing makes the workpiece temperature increase. Therefore, the workpiece temperature t_2 is higher than room temperature and higher than the temperature t_1 of the measuring tool. In order to ensure the size of the workpiece, it is usually measured when the workpiece is cold to room temperature or near room temperature. In order to increase productivity, you have to reduce waiting for the cooling of the workpiece. Experienced workers can guarantee both product quality and high productivity. Often, they do not wait for the part to cool down and measure it