Because the thread turning tool used in the processing of precision parts of the lathe is a forming tool, the spiral movement in the turning process has a greater impact on the clearance angle of the turning tool than in the outer circle, so the thread turning tool after sharpening must meet the following requirements.
- The tip angle is equal to the tooth profile angle
The tool nose angle of the turning tool directly affects the thread profile angle. When the rake angle of the fine thread turning tool is zero, the tool nose angle is equal to the thread profile angle of the machined thread. For example, when turning ordinary thread, the tool nose angle is equal to 60°; when turning inch triangle thread, the tool nose angle is equal to 55°.
- The left and right cutting edge requirements of the turning tool
The left and right cutting edges of the turning tool must be straight (except for ball screw threads and symmetrical serrated threads).
- The influence of the working angle of the turning tool
The working clearance angle of the turning tool is affected by the thread lift angle. The clearance angles on both sides should be ground unequal. The clearance angle on the feed direction side should be ground a few degrees larger than the thread external angle to produce a clearance angle during cutting. However, the triangular thread with large diameter and small pitch has a negligible effect on the clearance angle of both sides of the turning tool in the machining of precision parts.
- The requirements and functions of the front angle of the turning tool back
In actual work, when using a high-speed steel thread turning tool to turn threads at low speeds, if a turning tool with a back rake angle equal to zero is selected, the cutting will not be smooth, chip removal will be more difficult, and the surface roughness on both sides of the tooth profile will not be easy to turn. Drawing requirements. When the rake angle of the back of the thread turning tool is 5-15°, the turning will be smoother, and it is easy to turn a relatively smooth surface on both sides of the tooth profile.
When the back rake angle of the thread turning tool is not equal to zero, because the cutting tools on both sides do not pass through the thread axis, the thread flanks of the thread are not straight, but will be curved. This error can be ignored for threads that are not demanding. Excluding. When the rake angle of the thread turning tool is not equal to zero, the thread profile angle must be greater than the standard profile angle. According to the technical requirements of the thread profile angle for precision parts processing, the sharpened tip angle should be appropriately reduced small.
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