A workpiece processing method includes preparing a workpiece having a plate portion that includes a base material and a first coating layer. The base material has a first surface and a second surface opposite to the first surface in a direction along a thickness of the base material. The first coating layer is provided on the second surface of the base material. The first coating layer in a first region of the plate portion is removed. A burring tool is moved in a first direction from the first surface toward the second surface in a rotating state to burr the plate portion so as to form a through hole and a flange in the first region of the plate portion after removing the first coating layer in the first region.

Provided is a hydraulic actuator shell and a preparation method. The hydraulic actuator shell comprises a foam metal sandwich composite pipe, a foam metal sandwich flange and a foam metal sandwich end cover; the foam metal sandwich composite pipe is connected with one end of the foam metal sandwich flange, and the foam metal sandwich end cover is connected with the other end of the foam metal sandwich flange; the foam metal sandwich composite pipe comprises a first metal pipe layer, a first foam metal layer and a second metal pipe layer sequentially arranged from inside to outside; and a first bonding interface among the first metal pipe layer, the first foam metal layer and the second metal pipe layer is a metallurgical bonding interface. The hydraulic actuator shell is used for improving compression resistance, corrosion resistance and vibration and noise reduction capabilities of the hydraulic actuator shell.

A process for forming extruded products using a device having a scroll face configured to apply a rotational shearing force and an axial extrusion force to the same preselected location on material wherein a combination of the rotational shearing force and the axial extrusion force upon the same location cause a portion of the material to plasticize, flow and recombine in desired configurations. This process provides for a significant number of advantages and industrial applications, including but not limited to extruding tubes used for vehicle components with 50 to 100 percent greater ductility and energy absorption over conventional extrusion technologies, while dramatically reducing manufacturing costs.