METHOD AND APPARATUS FOR HARDENING WITH LASER BEAM

Japanese Patent JP3894306

B2

PROBLEM TO BE SOLVED: To provide a new hardening method with laser beam instead of an oscillation system or an integrated system with which uniform hardening can be obtained by controlling heat input in the width direction of a hardening portion of a work.
SOLUTION: Two elliptic irradiating patterns P1 ans P2, are combined as V-shape so that respective end parts mutually overlap and two laser beams are scanned to a scanning direction A while preceding the front tip part of this V-shape pattern P3 on the center line in the width direction of the part 2 to be hardened of the platy work 1. Preheating effect is developed to both end parts in the width direction at the part 2 to be hardened by transferring the heat from a side precedingly irradiated to a side irradiated at behind time, and the hardened depths at both end parts are increased. Near the center in the width direction of the part 2 to be hardened, the hardened depth is increased by overlapping two irradiating patterns P1 and P2 and as a result, the hardened layer 3 having almost uniform hardened depths, is formed.

Yusuke Nohara
Keisuke Tsunoda

JP2002214081A

March 22, 2007

July 23, 2002

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TOYOTA JIDOSHA KABUSHIKI KAISHA

C21D1/09; (IPC1-7): C21D1/09; B23K26/00; B23K26/06

Calyx
Toshio Nakamura
Miyazaki Yoshio
Kaoru Onozuka

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