RESEARCH ON WALL THICKNESS UNIFORMITY OF HOLLOW AXLES BY THREE-ROLL SKEW ROLLING

摘要

The paper describes wall thickness non-uniformity of hollow axles by three-roll skew rolling and the proposed improved measure. According to the characteristics of the three-roll skew rolling process, a simulation model of hollow axles by three-roll skew rolling was established. In order to study the influence of different process parameters on wall thickness uniformity, five main process parameters (feed angle, rolling angle, length of forming zone, axial feed speed, temperature) were selected and imported into the simulation model for simulation analysis. The results show that the optimum process parameters are feed angle 7°, rolling angle 30°, length of forming zone 5mm, axial feed speed 20-30 mm/s and temperature 1050°C with the same conditions, and the maximum deviation of the wall thickness is 0.7 mm. The uneven wall thickness of the axle body is caused by the metal reflow, which can be solved by compensating for the radial feed of the roller or by secondary machining. Reasonable selection of process parameters can significantly improve wall thickness uniformity of hollow axles by three-roll skew rolling.