Abstract: Variations in the quality of starting end parts of cladding layers are reduced. An aspect of the present disclosure is a method for forming a cladding layer in which a cladding layer is formed by starting to supply a metal powder onto a base material by changing a supply instruction to an on-state, and irradiating the metal powder with a laser beam according to a laser output pattern corresponding to the supply instruction. The method includes, before forming the cladding layer, acquiring a fluidity of the metal powder, and changing the laser output pattern according to the acquired fluidity.

Abstract: Provided is a heat treatment method for a cam piece, and the cam piece has an insertion hole into which a cam shaft is inserted, a base portion configuring a base circle of a cam, and a nose portion configuring a cam ridge. The heat treatment method for the cam piece includes: a first step of using a jig formed into a shape having a cavity, the jig being inserted into the insertion hole such that the cavity is located between an inner circumferential surface of the nose portion of the cam piece and a central axis of the jig; and a second step of heating the cam piece from an outer circumferential surface side by high-frequency induction heating in a state in which the jig is inserted in the insertion hole of the cam piece.

Abstract: A heat treatment method for a steel material according to the present invention includes: a first step of forming austenite by heating the steel material to a temperature equal to or higher than an A1 point; a second step of cooling the steel material heated in the first step, while keeping the steel material at a temperature higher than an Ms point, thereby causing the austenite of the steel material to be transformed into ferrite, pearlite, or bainite; and a third step of cooling the steel material to a temperature equal to or lower than the Ms point after the second step. According to the present invention, it is possible to provide a heat treatment method for a steel material which is capable of shortening a heat treatment time while suppressing the formation of martensite.

Abstract: Variations in the quality of starting end parts of cladding layers are reduced. An aspect of the present disclosure is a method for forming a cladding layer in which a cladding layer is formed by starting to supply a metal powder onto a base material by changing a supply instruction to an on-state, and irradiating the metal powder with a laser beam according to a laser output pattern corresponding to the supply instruction. The method includes, before forming the cladding layer, acquiring a fluidity of the metal powder, and changing the laser output pattern according to the acquired fluidity.

Abstract: Provided is a heat treatment method for a cam piece, and the cam piece has an insertion hole into which a cam shaft is inserted, a base portion configuring a base circle of a cam, and a nose portion configuring a cam ridge. The heat treatment method for the cam piece includes: a first step of using a jig formed into a shape having a cavity, the jig being inserted into the insertion hole such that the cavity is located between an inner circumferential surface of the nose portion of the cam piece and a central axis of the jig; and a second step of heating the cam piece from an outer circumferential surface side by high-frequency induction heating in a state in which the jig is inserted in the insertion hole of the cam piece.

Abstract: A heat treatment method for a steel material according to the present invention includes: a first step of forming austenite by heating the steel material to a temperature equal to or higher than an A1 point; a second step of cooling the steel material heated in the first step, while keeping the steel material at a temperature higher than an Ms point, thereby causing the austenite of the steel material to be transformed into ferrite, pearlite, or bainite; and a third step of cooling the steel material to a temperature equal to or lower than the Ms point after the second step. According to the present invention, it is possible to provide a heat treatment method for a steel material which is capable of shortening a heat treatment time while suppressing the formation of martensite.