Abstract
Analysis has shown that vibration cutting is a suitable process for production of internal screw threads in thin stainless steel cylinders. A precision vibration internal threading lathe has been developed. Experiments were carried out with this lathe to investigate the tool life, chip type, accuracy of machined thread etc. The main results obtained by experiments are: (1) the chips formed by this vibration cutting are unoxidized, white-grey, flow type chips; (2) a smooth machined flank is produced which has an iridescent surface; (3) the desired sharp profile of the internal thread can be machined; (4) the relation between tool wear and cutting lengths was investigated; (5) by this process and lathe, it is possible to thread 10 000 pieces per tool. This is a 200-fold extension of tool life, compared with 40–50 pieces in conventional cutting. The vibration internal threading machine has been used in mass production tests, and the above results confirmed on about 500 000 work-pieces.
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