Abstract: A method for processing a nut seat formed around a bolthole on a wheel including the steps of drilling the nut seat and the bolthole substantially simultaneously with a step drill and performing roller burnishing on at least edge portions of the nut seat wherein the roller is rolled on the nut seat in the circumferential direction of the nut while the roller is pressed onto the nut seat. By roller burnishing, at least the edge portions of the nut seat are finished to a specular grade. The strength of the nut seat itself can be increased by the roller burnishing, thereby decreasing the required thickness of a light alloy wheel and the total weight of the wheel. In addition, the manhours for processing the wheel can be reduced.

Abstract: A method of manufacturing a rectangular frame for a vehicle sunroof in which first and second straight metal profiles (38, 40) are assembled to form a frame stock assembly which is bent at intervals along its length to form the frame. The profiles are arranged as radially outer and inner components, respectively, in the plane of the bend and are coupled by means of a web (42) of the inner component (40) engaging in a slot (44) in the outer component (38). The profiles are assembled together by sliding the web longitudinally along the slot, and interengaging surfaces (43, 45) remain free to slide against one another during bending of the assembly. The profiles are assembled prior to shaping the frame. During bending the profiles can slide relative to one another reducing deformation occurring at the bend and allowing the frames to be formed with tighter bends at the corners than has previously been possible.