Structural Design of Precision CNC Machining Parts
1, precision CNC machining parts of the cavity and shape of the best use of a unified geometric type and size. This can reduce the tool specifications and the number of tool changes, so that programming convenience, improve production efficiency.
2, the size of the inner fillet determines the size of the tool diameter, so the radius of the groove should not be too small. Parts of the process is good or bad and the contours of the processing, the size of the radius of the transfer radius and so on.
3,
precision CNC machining parts milling at the end of the plane, the groove bottom radius radius r should not be too large.
4, should adopt a unified benchmark positioning. In the precision CNC machining, if there is no uniform benchmark positioning, due to the re-installation of the workpiece after processing on both sides of the contour position and size of the phenomenon of uncoordinated. To avoid the problem, to ensure that the two fixtures after the relative position of the accuracy of their work should be a unified benchmark positioning.
Note: It is best to have a suitable hole in the part as the positioning reference hole. If not, set the process hole as the positioning reference hole (such as adding the process lug on the blank or setting the process hole on the margin ). If the process hole can not be made, at least have to use the finished surface as a unified benchmark to reduce the two clamping errors. In addition, it should also analyze the parts required processing accuracy, size tolerance, etc. can be guaranteed, with or without the contradictory of the excess size or affect the process of closing the size of the arrangement.
