Forming device and forming method for thin-wall sleeve magnetic materials

The invention provides a forming device and a forming method for thin-wall sleeve magnetic materials, and relates to the field of powder metallurgy forming. The device comprises a powder forming machine and a pressing die; the fit clearance between a lower punch of the die and the inner wall of a punching hole is 5-8mum, and the fit clearance between an upper punch of the die and the punching hole is 5-8mum; the strength of a material adopted by effective working parts of a rod core, the upper punch and the lower punch, and a female die are respectively higher than the saturation polarization strength of soft magnetic material powder which needs to be pressed; tungsten steel of which the compressive strength is more than HRA89 degrees is adopted by the effective working parts of inner walls of the upper punch and the lower punch and the rod core; high-speed steel is adopted by the female die and a substrate of the pressing die, i.e. the upper punch and the lower punch are both of welding structures of the tungsten steel and the high-speed steel. According to the forming device and the forming method provided by the invention, the pressing effect of the soft magnetic powder is enhanced, so that the density of all parts of a formed thin-wall sleeve is uniform, and the thin-wall sleeve has higher dimensional accuracy.