| 摘要 |
PCT No. PCT/AU97/00628 Sec. 371 Date Jul. 2, 1998 Sec. 102(e) Date Jul. 2, 1998 PCT Filed Sep. 23, 1997 PCT Pub. No. WO98/13163 PCT Pub. Date Apr. 2, 1998This invention relates to a method for manufacturing a plurality of longitudinally extending slots in the bore of a component (1). One example of such a component is the sleeve element of an automotive power steering rotary valve. More particularly the invention is directed towards a method of minimising burring of the slot edges of the sleeve component. The method comprises the steps of gripping the component (1) in a gripping mechanism (2) of a workholding device, performing a first cutting operation (5) in which the slot is cut in the bore by a series of progressively deeper cutting stroke of a cutting tool (5), further machining (30) the bore of the component, the machining of the bore being carried out while the component remains gripped in the gripping mechanism, characterized in that while the component remains gripped in the gripping mechanism the slot undergoes a second cutting operation (5) similar to the first operation.
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