| 摘要 |
This 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 said component (1) in a gripping means (2) of a workholding device, performing a first cutting operation (5) in which said slot is cut in said bore by a series of progressively deeper cutting strokes of a cutting tool (5), further machining (30) said bore of said component, said machining of said bore being carried out whilst the component remains gripped in said gripping means, characterised in that whilst said component remains gripped in said gripping means said slot undergoes a second cutting operation (5) similar to the first operation. |
