Broach tool and broaching method
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United States of America Patent
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N/A
Issued Date -
Nov 11, 2004
app pub date -
Apr 27, 2004
filing date -
May 7, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A broach tool for finishing a hollow hole has a number of cutting edges arranged in order of dimensions in a longitudinal direction. The cutting edges in at least a finishing portion are formed of cemented carbide. A cutting depth of each edge in a cutting direction is 5 .mu.m to 15 .mu.m for slots such as a spline hole and a ball groove, or 3 .mu.m to less than 9 .mu.m for a round broach hole. A work has the hollow hole pre-worked leaving a finish cutting allowance, and has hardness of 45 to 65 HRC (Rockwell hardness C scale) after subjected to a thermal treatment. A hollow hole cut surface is finished into the finished dimension with use of the broach tool. The broach tool has little chipping on cutting edge tips and is hardly abnormally worn and has a long life.
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