Evaluation method for machining precision of squaring machine

The invention discloses a method for evaluating the machining precision of a squaring machine. The method comprises the step of respectively measuring and evaluating one or more of the symmetry plane range of a silicon rod after squaring, the maximum straightness deviation or the maximum planeness deviation of each plane, the section shape, the length direction shape and the contour shape. According to the invention, through the straightness mechanism and the planeness mechanism, the size precision of a measured point is measured through the same measurement process, and more accurate cutting surface information are obtained through different treatment means, so that compared with an original range method, the basis for reflecting the machined surface is more comprehensive; by selecting a specific measuring point, the overall shape of the cross section is controlled, wherein the process is simple and easy to operate; the method is high in precision requirement and beneficial for controlling the finished produ