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众所周知,圆弧样板的曲率半径,可以在垂直于被测表面上直接测出,因为它的圆弧曲线就在被测表面上。圆弧刀具的圆弧曲线不在被测表面上,虽然该曲线的A向(如图)投影为一圓弧,但在被测表面上的实际曲线却是一段椭圆弧线,这是因为刀具具有一定的前、后角所造成的。所以,用半径样板沿着刀具刃口以观察缝隙的办法来检验圆弧刀具的标称半径是不正确的。同样,采用A向投影进行测量在理论上虽然是可行的,但由于受光学仪器物镜焦深度的限制,在实践上却是难以实现的。因此,我们不得不从B向(见图)投影来寻找解决问题的办法。
It is well-known that the radius of curvature of an arc template can be measured directly perpendicular to the surface under test because its arc curve is on the surface under test. Arc curve arc tool is not on the measured surface, although the curve of the A (Figure) projected as a circular arc, but the measured surface of the actual curve is an elliptical arc, it is because the tool has A certain amount of before and after the corner caused. Therefore, the use of radius model along the edge of the tool to observe the gap approach to check the arc tool nominal radius is not correct. Similarly, the use of projection A to measure in theory, although feasible, but due to the optical lens focal depth limit, in practice it is difficult to achieve. Therefore, we have to project from B (see figure) to find a solution to the problem.