| 摘要 |
1,148,692. Making bearing race inserts; bending; coiling; rolling. FMC CORP. 27 Feb., 1967 [28 March, 1966], No. 9164/67. Headings B3A, B3E and B3M. A method of making bearing race inserts comprises shaping a blank 12 into a coil by rolling between rollers 14, 16, 18, 20 having mating concave and convex surfaces and cutting the coil into a plurality of race inserts. The upper rollers 14, 18 are mounted on shafts in eccentric sleeves which are rotatable to allow for vertical adjustment of the rollers. The rollers force the strip against a shoe 64 which deflects the strip into a coil of predetermined radius. The strip has a curved transverse cross-section and the shoe 64 is set to deflect the strip in such a way that the concave surface is external or internal depending on whether an inner or an outer insert respectively is required. The intermediary coil for internal inserts is placed on a mandrel (70) and cut into rings by a rotary cutter (74) travelling axially thereof, Fig. 2 (not shown). The intermediary coil for external inserts is placed in a sleeve 80 and cut into rings by a cutter 84. The rings are placed in perforated cylinders for heat treating. To prevent excessive expansion or contraction the internal inserts are restrained by plugs 92 and the external inserts have an elongated block placed between their opposed free ends. The perforations in the cylinders allow a quenching medium to reach the unexposed sides of the inserts. Hard metals such as stainless steel may be used without heat treatment. Instead of forming an intermediary coil, each strip may be formed into an individual insert, the only machining being trimming of the ends, if necessary. |
