The rough machining of the complex cavity parts adopts the circular cutting machining of the rough machining of the plane area, and the finishing machining to ensure the accuracy and surface quality. The main purpose is to improve the production efficiency and uniform margin, etc., to improve the machining efficiency of the parts and the quality of the machining.

The cavity is mainly divided into rectangular cavities, circular cavities, and irregular cavities. During the machining process, the internal area should be processed first, and the route with the best efficiency should be arranged rationally to ensure that the island and internal contours do not collide when the tool is moved to avoid occurrences of cutting phenomenon. When machining contours, make full use of the tool radius compensation function, offset a tool radius R from the contour inward, and leave a certain margin for finishing.

When processing, rough milling is mainly divided into circular cutting processing and parallel processing, to remove the excess amount as soon as possible and improve the processing efficiency. The purpose of finishing milling is to improve the machining accuracy. Based on rough milling, plane contour finishing is used to ensure the dimensional accuracy and shape accuracy of the parts. To avoid over-cutting and tooling, the arc and corners should appropriately reduce the feed speed; use circle the arc approach and retract methods.