Internal broaching machine and internal broach
AssigneesNachi-Fujikoshi Corp., Fuji Heavy Industries Ltd.
InventorsKatsuyuki Shimasaku, Chiaki Uwai
Life of this patent
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Abstract
A broach for internal broaching is formed on its pull end and/or follower end with a tapered surface machined with high accuracy. A pull head and/or a retrieving head of a broaching machine, which drivingly grip the pull end and the follower end the broach, is formed with a tapered inner surface complementary to the tapered surface of the broach. The pull head and the retrieving head grip the broach while pressing and clamping their tapered inner surface against the tapered surface, and these heads and the broach are firmly connected together. Clearances or gaps between the heads and the broach are thus eliminated, concentricity between the heads and the broach is significantly improved, and broaching can be performed with high accuracy.
Claims8
An internal broaching machine comprising:
- a broach having a front shank or pull end and a rear shank or follower end, at least one of said pull end and said follower end being formed with a tapered surface;
- a pull head and a retrieving head for respectively gripping said pull end and said follower end, at least one of said pull head and said retrieving head being formed with a tapered inner surface complementary to said tapered surface of said one of the pull end and the follower end;
- and
- a means for firmly connecting the heads and the broach together by pressing and clamping the tapered surface of the broach against the tapered inner surface of the head.
A broach for internal broaching comprising a front shank or pull end, a rear shank or follower end, and a tapered surface formed on at least one of said pull end and said follower end, said tapered surface being complementary to a tapered inner surface formed in a head of a broaching machine for drivingly gripping the one broach end.
Dependencies are inferred from the claim text.