Abstract
In magnesium alloy extrusion it is well known that the surface cracks usually occurred at the vertical direction to the extrusion prohibit the productivity and surface quality. The die with the taper brake bearing have investigated. Then it became clear that the die with the taper brake bearing is effective for improving the occurring of the surface cracks. So, we adopted the method at the practical industrial scale using the new magnesium alloy with low aluminum and zinc contents. Then on the magnesium extrusion, by using the method it became clear that we can extrude on the extremely high speed.
