钢铁产品的尺寸是生产厂家和用户共同关注的、用户希望所买到的产品尺寸即是订货的尺寸 ,但实际上按一定生产工序加工出来的产品与订货尺寸总会有一个上、下偏离 ,即正、负偏差 ,当然用户总希望这个偏差越小越好 ,即精度越高越好 ,而在实际生产中 ,尺寸精度控制越高 ,生产难度 The size of steel products is the common concern of manufacturers and users, users want to buy the size of the product that is the size of the order, but in fact a certain production process processed products and order size there will always be a deviation, That is, positive and negative deviation, of course, the user always hope that the smaller the better, that is, the higher the accuracy the better, but in actual production, the higher the dimensional accuracy control, production difficulty