| 摘要 |
1280254 Making bearings; dies SVENSKA KULLAGERFABRIKEN AB 20 Feb 1970 [24 Feb 1969] 8315/70 Heading B3A A method of making a bearing member of an axial thrust bearing, Fig. 1, the member comprising a flat disc 1 having spiral grooves 2, comprises pressing the grooves into a blank 9 made of sintered metal powder of carbon content less than 0À1% by means of a die 4 made by forming grooves, corresponding to the raised portions of the bearing member, by etching or machining the metal of the die and then grinding the die surface flat. The grooves produced in the bearing member have smooth walls and bottoms. The top surfaces of the raised portions are rough. The member may be used with the roughness retained or it may be removed by grinding. The sintered metal member may be nitrided or annealed, e.g. at 1000‹ C., after having been coated with nickel or chromium. |
