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在加工汽车和拖拉机零部件时,有许多非整圆工件(如汽车轴瓦、传动轴叉耳孔)的半径 R_i 需要进行检查和测量。众所周知,在测量弓高小于或等于半径的非整圆工件半径 R_i 时,通常都是在工具显微镜上直接测出被测工件的弓高、弦长。然后,按照“弓高弦长法”公式将被测工件的半径 R_i 计算出来。其公式为R_i=(H~2)/(8h)+h/2式中 R_i-被测工件的半径(mm);H-当测量弓高为h时的弦长(mm)。但是,由于生产和测量条件的限制及在大批量生产中的工件检查与验收中,上述方法就不很适应。此时,如果采用弓高差值法
When machining automotive and tractor components, the radius R_i of many non-full-round workpieces (such as automotive bushings, drive shaft prongs) needs to be inspected and measured. As we all know, in the measurement of bow height less than or equal to the radius of the non-circular workpiece radius R_i, usually measured directly on the tool microscope bow, measured chord length. Then, calculate the radius R_i of the workpiece according to the formula of “bow-height chord length”. The formula is R_i = (H ~ 2) / (8h) + h / 2 where R_i- radius of the workpiece under test (mm); H - chord length (mm) when the bow height is measured. However, these methods are not well suited to the inspection and acceptance of workpieces in mass production due to the constraints of production and measurement conditions. At this point, if the bow height difference method