4results about How to "Reduce the roughness value" patented technology

The invention belongs to the technical field of metal part surface modification, and relates to a composite strengthening method for a carburized surface of a high-bearing gear of an aero-engine. According to the method, high-hardness and high-density ceramic shots are adopted as media for high-energy mechanical shot peening strengthening, the advantage that the subsurface strain hardening effect of the contact strengthening technology is good and the barb-shaped distribution characteristic of mechanical shot peening residual compressive stress are utilized, extremely high residual compressive stress is introduced to the subsurface position, and the contact fatigue performance of the tooth surface of the gear is improved. High-frequency laser shot peening strengthening is used for secondary treatment, so that the surface layer of the material is subjected to plastic deformation, high-amplitude residual compressive stress is introduced into the surface layer of the material within the depth range of more than 500 microns by utilizing the advantage of large influence depth of laser-induced shock waves, and the residual compressive stress can inhibit fatigue crack initiation, has a certain depth and inhibits fatigue crack propagation; and the bending fatigue resistance of the root of the gear can be effectively improved. And an abrasive flow process is adopted, so that the roughness is reduced to be more than 0.4 mu m.

The invention discloses a novel automatic polishing device for bearing machining, and belongs to the technical field of bearing machining, the novel automatic polishing device for bearing machining comprises a base, a vertical plate is fixedly mounted on one side of the top of the base, a material frame, a cooling mechanism and a feeding mechanism are arranged at the top of the base, and a clamp is connected to the output end of the feeding mechanism; the polishing device comprises a vertical plate, a polishing mechanism and a linkage mechanism are arranged on one side of the vertical plate, a rotating cylinder is rotationally installed in the vertical plate, a plurality of inclined plates are slidably connected to the outer side of the rotating cylinder, clamping plates are fixedly connected to the outer sides of the inclined plates, and a driving mechanism used for driving the rotating cylinder to rotate is arranged on the other side of the vertical plate. And the driving mechanism comprises a driving motor. According to the bearing outer ring polishing device, automatic fixing and feeding and discharging work of a bearing outer ring can be achieved through cooperation of the material frame, the feeding mechanism and the clamp, automatic polishing treatment is achieved through cooperation with the polishing mechanism, meanwhile, polishing parameters can be controlled through the abutting wheel through cooperation with the linkage mechanism, and control is more accurate.

The invention discloses an ultrasonic vibration auxiliary milling method for a Ti2AlNb material, and belongs to the technical field of alloy material machining. The method comprises the following steps: removing a surface oxide layer from a Ti2AlNb material piece; the Ti2AlNb material piece is subjected to longitudinal-torsional composite ultrasonic vibration auxiliary milling machining; wherein the longitudinal-torsional composite ultrasonic vibration is used for assisting milling, and the vibration parameters of the longitudinal-torsional composite ultrasonic vibration are as follows: the torsional vibration tangential line amplitude is 4-8 microns, the ultrasonic frequency is 20-30 kHz, the longitudinal vibration amplitude is 3-6 microns, and the phase difference is 90 degrees. According to the method, the Ti2AlNb material piece with the machining surface small in roughness value and large in residual compressive stress value is finally obtained, harmful tensile stress of the machining surface obtained through pure milling machining is converted into compressive stress, generation of microcracks can be effectively restrained, and the service life of the material is prolonged.

The application discloses a cord fabric unwinding and wrinkle removing device and a production method of an unwinding roller, and belongs to the technical field of cord fabric manufacturing. The unwinding and wrinkle removing device comprises an unwinding roller, a main hot moistening positioning roller and an auxiliary hot moistening pressing roller. Cord fabric on a cord fabric winding disc sequentially passes through the unwinding roller, the main hot moistening positioning roller and the auxiliary hot moistening pressing roller. The unwinding roller is used to apply a force to the cord fabric, so that the cord fabric is stretched along the width direction of the cord fabric. The main hot moistening positioning roller is used to moisten and fix the unwound cord fabric. The auxiliary hot moistening pressing roller is used to assist in moistening the cord fabric. The unwinding and wrinkle removing device integrates unwinding, setting and moistening. When the cord fabric is unwound, the unwound state can be fixed, and the cord fabric surface can be smoothed and wrinkle-free in time through moistening, so that the cord fabric is prevented from being stained with glue due to wrinkles.