| 摘要 |
The invention concerns a tool blank, and more particularly a blank for a shaft cutter (8, 9), in the form of a cylindrical, unitary rod (1) of steel having the same alloy composition along the length of the rod, characterized in that a first end portion (2) of the rod, extending over 20-60 %, preferably 25-45 % of the length of the rod, measured from said first end of the rod, has a hardness which is 1-10 HRC units higher than the hardness of the second end portion (3) of the rod, said second end portion extending over 20-60 %, preferably 25-45 %, of the length of the rod measured from the second end of the rod. The invention also relates to the manufacturing of the tool blank and its use for the manufacturing of cutting tools. |
