Cutting tool produced by sintering a blank formed by a pressing tool
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United States of America Patent
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-
Mar 6, 1990
Grant Date -
N/A
app pub date -
Apr 21, 1988
filing date -
Apr 21, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cutting bit (1) has a bottom side (2), flanks (3) that are inclined at a positive clearance angle (.alpha.) with respect to the bottom side (2), and a top side (7). The top side (7) has cutting edges (5 and 5') which are inclined with respect to one another at an angle of inclination (.lambda.). The cutting bit is made by sintering a blank which is formed using a pressing tool (10). The pressing tool includes a mold member (11), an upper die (12), and a lower die (13). The upper die (12) has a pressure face (20) which corresponds precisely, except for an allowance for the shrinkage ratio of the sinter material, to the actual surface of the upper side of the cutting bit (1). When the upper die (12) is fully inserted into the mold (11), a free space (31) exists between the upper die (12) and the mold member (11), the free space being disposed above the delimiting line (21) of pressure face (20) of the upper die (12).
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