| 摘要 |
PROBLEM TO BE SOLVED: To provide a multistage reamer which prevents deterioration in the working accuracy of a hole caused by chips produced by cutting of a blade in another stage. SOLUTION: Because the injecting direction of coolant injected from a coolant hole 8b opening on the working surface 6b of a second blade 4b is set opposite to the injecting direction of coolant injected from a coolant hole 8a opening on the working surface 6a of a first blade 4a, the chips produced through cutting of a cutting edge 5b of the second blade 4b can be discharged toward the direction opposite to the tip side by the coolant injected from the coolant hole 8b opening on the working surface 6b of the second blade 4b. Thus, a flaw on a finishing surface caused with the chips, which are produced at cutting of the cutting edge 5b of the second blade 4b and enter into the gap between the adjacent first blade 4a and the finished surface finished by the first blade 4a, can be prevented, securing the required working accuracy of the hole. COPYRIGHT: (C)2011,JPO&INPIT
|
