Calculation method for stroke speed of gear shaping machine

Writer： admin Time：2024-05-11 15:36:12 Browse：68℃

The calculation method of the stroke speed of the gear shaping machine mainly depends on the stiffness of the machine tool and the strength of the cutting tool. The specific details are as follows

Cutting speed. The cutting speed is initially determined based on the tool strength, for example, assuming v=20m/min. Then determine the number of strokes based on the tooth width of the workpiece. For example, if the tooth width B is 10mm, then the stroke length l=12mm. The calculation formula for the number of strokes n0 is n0=1000 x v/(2 x l).

Circular feed rate. The magnitude of the circumferential feed rate depends on the stiffness of the machine tool, which limits the cutting force. The calculation formula for the maximum circumferential feed rate is fcmax=Fzmax x Z x 2/Fzmax, where Fzmax is the maximum cutting force of the machine tool, m is the modulus of the workpiece, and Z is the number of teeth on the workpiece.

Radial feed rate fr. The radial feed rate fr is generally selected as 0.1~0.3fc.

Verification of machine tool transmission power. The verification formula for the transmission power of machine tools is P=106 × F × v. If the transmission power of the machine tool is exceeded, it is necessary to specify the cutting speed again and calculate the number of strokes.

The number of cuts. Select the number of tool passes based on the requirements of surface roughness of the parts and the size of the full tooth depth.

In addition, when programming, it is necessary to clarify that the gear hobbing machine operates according to the principle of meshing two involute gears without backlash. Therefore, the final positions of each axis are calculated according to the following principles:

Firstly, the workpiece rotation angle j=n0 x 360 degrees/minute ÷ fr is determined based on the radial cutting depth, fr, and the number of strokes; Next, determine the rotation angle of the cutting tool, which is 3 times - h x the cutting tool

=N0 x fr x 360 degrees/minute ÷ fr; Finally, determine the degree of rotation of the workbench and the degree of rotation of the tool during the return journey.