Showing papers on "Roller burnishing published in 1977"

Method for making stators for dynamoelectric machines

Abstract: A method which involves aligning a stack of a plurality of loose laminations so that clamp bolt holes therein are held in an accurately aligned condition while the stack is compressed (in the vicinity of the bolt holes) between pads that simulate mounting pads in a compressor, and a means for applying a force localized in the bolt hole regions. The compressive forces are preselected to simulate and closely approximate the compressive forces that ultimately will be applied to the bolt hole regions under the heads of mounting bolts in a compressor. Since the stack is initially aligned before the compressive forces are applied and while the laminations are free to shift relative to one another, the various eccentricities and dimensional variations between the bore and bolt holes are transferred to the bore. Then, while the stack is held with the preselected compressive forces, the bore is shaped to be concentric relative to the bolt holes. One means that may be used to shape the bore is a tool known in the motor manufacturing art as a roller burnishing tool.

Wheel disc pressure die castings - made of aluminium wrought alloy with roller burnishing of rim outsides

Abstract: Wheel discs consisting of an AlCu alloy are produced as press die castings The outer ends of the rims are compressed to the final shape by a roller burnishing treatment Al-Cu alloys are wrought alloys and have a higher elongation to fracture than conventional Al-Si cast alloys The burnishing makes any defect visible and strengthens the rims ends without any necessity of machining operations The result is a more precise wheel of lower wt