| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of a stage difference in a cutting surface of a work by quickly replacing a tool when the residual service life of a tool being used in a machine tool end. SOLUTION: This tool replacing device, if constituted so that selecting a predetermined tool may be selected among tools housed in a tool magazine and may replace, is provided with a service life administrating means for administrating the service life of a tool held in the tool magazine, a service life discriminating means for discriminating whether the service life of the tool used in the machine tool is left or not when a following block to be carried out among the working program carried in the machine tool is 'positioning', and an exchanging means for selecting a spare tool having a service life in the tool magazine for replacement when the service life discriminating means determines that the service life of the tool used in the machine tool is run out.
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