The squeezing tool rolling knife is clamped on the spindle of the vertical drilling machine, the workpiece is clamped on the three-jaw chuck fixed on the drilling machine table, and a certain squeezing force is applied to the surface of the workpiece through the most forward feed to make Corresponding plastic deformation of the surface metal; and then through the rotation of the most-direction and squeezing tool, the residual tool mark wave crest after turning of the workpiece is forced to squeeze the convex material into the front wave trough while self-deforming, thereby reducing the tool mark The height difference between the wave crest and the wave trough achieves the purpose of reducing the surface roughness value. In the extrusion process, the rolling knife will generate residual pressure on the surface of the workpiece, which can improve its fatigue strength and corrosion resistance. Cylindrical rolling cutter
The size of the extrusion margin determines the size of the required extrusion force, and the size of the extrusion force directly affects the extrusion effect. If the squeeze allowance is too large, the squeeze knife will wear out quickly, resulting in a decline in the surface quality of the workpiece; if the squeeze allowance is too small, the expected processing purpose will not be achieved.
Therefore, the smallest extrusion margin should be selected as far as possible under the premise of ensuring the extrusion accuracy. The positioning shaft material is beryllium bronze, which is a typical soft non-ferrous metal. Therefore, the larger extrusion margin can be selected from 0.03 to 0.05 mm; the spindle speed is selected to be 200 to 250 r/min, and the tool feed amount is selected to be 0.01 to 0.03 mm/r.
Before processing, test pieces of the same material and same size should be tested to determine the best extrusion parameters.