FRICTION JOINING METHOD AND JOINED STRUCTURE

• US 20140050519A1
• Filed: 10/23/2013
• Published: 02/20/2014
• Est. Priority Date: 04/25/2011
• Status: Active Grant

• Current Assignee: IHI Corporation
• Original Assignee: IHI Corporation
• Inventors: Sakamoto, Rie, Nakamura, Kenji, Kawashima, Hiroaki, OIWA, Naoki, Otake, Yasuhiro, Tsunori, Mitsuyoshi
• Granted Patent: US 8,950,651 B2
• Time in Patent Office: Days
• US Class Current: 403/270
• CPC Class Codes: B23K 20/12 the heat being generated by friction; Friction welding
• CPC Class Codes: B23K 20/1205 using translation movement
• CPC Class Codes: B23K 20/129 specially adapted for particular articles or workpieces
• CPC Class Codes: B23K 20/24 Preliminary treatment
• CPC Class Codes: F01D 5/025 Fixing blade carrying members on shafts attachment of a member on a shaft in general F16D1/06; for non-positive displacement pumps F04D29/00
• CPC Class Codes: F01D 5/3061 by welding, brazing
• CPC Class Codes: F01D 5/34 Rotor-blade aggregates of unitary construction , e.g. formed of sheet laminae; discs formed of sheet laminae F01D5/028; ceramic materials F01D5/284, composite materials F01D5/282
• CPC Class Codes: F05D 2230/239 Inertia or friction welding
• CPC Class Codes: Y10T 403/477 Fusion bond, e.g., weld, etc.

Abstract

A heating process makes a temperature of joining surfaces Wa and Ta of a pair of metal parts W and T at the start of a first joining process equal to 20% or greater, preferably, 40% or greater of a melting point of material of the metal parts W and T. The heating process makes a heating depth h of the pair of metal parts W and T at the start of the first joining process equal to 1.0 mm or greater.

Claims

1. A friction joining method of connecting joining surfaces of a pair of metal parts to each other with the use of frictional heat generated at the joining surfaces of the pair of metal parts, comprising:

a heating process heating at least one of the joining surfaces of the pair of metal parts;

a contact process, after the completion of the heating process with the joining surfaces of the pair of metal parts being faced to each other, relatively moving one of the metal parts toward the other to bring the joining surfaces of the pair of metal parts into contact with each other; and

a joining process, after the completion of the contact process with the joining surfaces of the pair of metal parts being faced to and in contact with each other, reciprocating one of the metal parts relative to the other in a direction parallel to the joining surfaces, and at the same time, relatively pressing one of the metal parts to the other until a movement of the pair of metal parts reaches a target movement, thereby softening with frictional heat the joining surfaces of the pair of metal parts and joining the joining surfaces together, wherein

the heating process makes a temperature at any one of the joining surfaces of the metal parts at the start of the joining process equal to 20% or greater of a melting point of material of the metal part.

2. The friction joining method according to claim 1, wherein the heating process makes a heating depth of any one of the metal parts at the start of the joining process equal to 1.0 mm or greater.

3. The friction joining method according to claim 1, wherein the heating process heats each of the joining surfaces of the pair of metal parts.

4. The frictional joining method according to claim 1, wherein the joining process includes:

a first joining process, after the completion of the contact process with the joining surfaces of the pair of metal parts being faced to and in contact with each other, reciprocating one of the metal parts relative to the other in a direction parallel to the joining surfaces, pressing at the same time one of the metal parts to the other to soften with frictional heat the joining surfaces of the pair of metal parts, and stopping the relative reciprocation of the metal parts upon the movement of the pair of metal parts reaching a pre-target movement that is set to be smaller than the target movement; and

a second joining process, after the completion of the first joining process, continuously pressing the metal part to the other until the movement of the pair of metal parts reaches the target movement so that the joining surfaces of the pair of metal parts are set into each other and are joined together.

5. The friction joining method according to claim 1, wherein the metal parts are engine parts used for a gas turbine engine.

6. A joined structure formed according to the friction joining method according to claim 1.