Right-angle grooves in precision parts machining consist of three planes with a cross-sectional shape of three straight lines, with adjacent lines perpendicular to each other. Right-angle grooves are usually divided into three forms: closed, semi-closed and open right-angle grooves. Right-angle grooves can be distributed on flat and cylindrical surfaces. The more classical right-angle grooves are keyways, which are divided into ordinary flat keyways and semi-circular keyways. The characteristics of the milling process for right-angle grooves are as follows.
1. Using fixed diameter or fixed width milling cutters (such as keyway milling cutters, semicircular keyway milling cutters, disc-shaped slot milling cutters, etc.) to control the width of the slot size with high accuracy, such as keyway on the shaft with flat keys and semicircular keys, open right-angle grooves with matching accuracy requirements, etc.
2. The symmetrical position of the keyway on the shaft in the precision parts machining is usually different according to the accuracy level, respectively, using different tool setting methods. The keyway with high symmetry requirements uses the indicator table ring table method to find the relative position of the workpiece axis and tool axis or the middle section of the disc milling cutter, and the keyway with low symmetry requirements can be processed by the cut mark-to-to-tool method.
3. The machining of keyway on the shaft is usually done by V-block positioning or self-aligning chucking with indexing head to ensure the symmetry of the workpiece and other major machining accuracy requirements.