| 摘要 |
The invention relates to mechanical engineering, in particular, to the methods for precision diamond abrasive surface finishing holes of parts from high-alloyed composite materials based on nickel and copper working under conditions of friction under severe operating conditions (ambient temperature - 800-, pressure - 10.5 MPa, sliding velocity of 100 m/s). In a method of magnetic abrasive finishing surfaces of cylindrical holes of parts from high-alloyed composite materials, including arrangement of a working tool in the cylindrical hole with formation of a working gap between the surfaces of tool and hole, creation in the gap of magnetic field, placing in the gap of ferromagnetic abrasive powder and rotation of the working tool around its axis, the novelty is that the working tool is further moved along a circular trajectory, and the trajectory of the working tool axis is displaced from the hole surface at a distance, which is the sum of values of working gap and radius of the working tool, the size of the working gap is 0.05-, and the grain size of ferromagnetic abrasive powder is 50 microns, the working tool is rotated around its axis at a speed of 10-15 m/s along a circular path at a speed of 1-5 m/min, and along the axis of cylindrical hole of the part it is given additional longitudinal reverse speeds of 200-350 mm/min. The disclosed modes of treatment provide increased quality parameters of surfaces for 1.5-2 times as compared with the method implemented in accordance with the closest analogue. While using process modes that go beyond the disclosed ranges, the process parameters of quality of surfaces are reduced. High quality of surface finishing is provided both for cast and composite high-alloyed materials. |
