| 摘要 |
PCT No. PCT/GB93/00053 Sec. 371 Date Jul. 21, 1994 Sec. 102(e) Date Jul. 21, 1994 PCT Filed Jan. 12, 1993 PCT Pub. No. WO93/13867 PCT Pub. Date Jul. 22, 1993An improved method of producing a rotary dispersion member comprises providing a frusto-conical from (23) with a cylindrical base (25), operating a cutting wheel (27) to cut a groove (28) in the from (23) by moving the cutter along a line (29) parallel to the side of the frusto-conical form until the straight part of the groove is cut to full depth and then moving the cutter away from the form at 90 DEG to its central axis (34), the end of the groove thereby being formed as arcuate, grinding away the periphery of the base (25) until the outer generated curve (32) is at the required angle to a surface normal to said axis (34), mounting the worked from on a plate (36) to produce one part of a mould tool, fitting the one part in another mould tool to define a cavity therebetween, and injecting material into the cavity. The resultant dispersion member can be formed with known teeth by spark eroding said another mould tool. |
