Design, processing and inspection of the geometric angle of indexable turning tools

With the popularity of CNC machine tools, the application range of indexable turning tools is expanding. The indexable turning tool can be quickly indexed and dimensionally stable during processing, and the blade can be quickly replaced after being worn, thereby significantly improving the processing efficiency and saving the tool cost.

An indexable turning angles of <br> <br> design indexable insert tools, the spatial position of the groove mainly by the main angle kr, and the front edge inclination angle ls g0 determined.

The main declination kr main declination has a great influence on the life of the indexable turning tool. In general, reducing the lead angle increases tool life. However, when the rigidity of the process system or the workpiece being processed is insufficient, reducing the lead angle increases the radial force, thereby increasing the deformation deflection, causing machining vibration, reducing the machining accuracy and the quality of the machined surface, and affecting the tool life. Therefore, Different lead angles are selected for different processing conditions. The recommended values ​​for the lead angle when designing the tool are shown in Table 1.

The blade inclination angle ls edge inclination also has a great influence on the cutting performance of the indexable turning tool. When cutting, the amount of blade inclination affects the direction in which the chips flow out. When finishing the car, in order to avoid the flow of chips and scratch the machined surface, the blade inclination often takes a positive value. In addition, the amount of blade inclination also affects the sharpness of the cutting edge. When designing the tool, the recommended values ​​for the blade inclination are shown in Table 2.

The size of the rake angle of the rake angle directly affects the strength and sharpness of the blade. Increasing the rake angle reduces chip deformation, makes cutting lighter, and increases tool life. However, if the rake angle is too large, the strength of the cutting edge will be weakened, and it will be easy to chip, which will shorten the tool life. There are many factors affecting the selection of the fore corner of the indexable turning tool. The recommended values ​​for the design are shown in Table 3. In the design of indexable turning tools, the front angle of the blade itself is also an important parameter and should be considered.

Table 1 Recommended value of indexable turning tool lead angle
Processing conditions Leading angle k r recommended value
Rough car Process system rigidity is better 45°~75°
Process system is less rigid 75°~90°
Finishing car Process system rigidity is better 45°
Process system is less rigid 60°~75°
Processing of slender shafts and thin-walled parts 90°~95°
Intermediate cutting and contouring of workpiece 45°~60°, 90°~95°

Table 2 Recommended values ​​for indexable turning edge

Processing conditions Blade inclination angle l s recommended value
Finishing car 0°~5°
Rough car -5°~0°
Intermittent cutting -5°~0°
Processing hardened steel -5°~-10°

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