Method for manufacturing heat exchanger plate and method for friction stir welding

Patent metadata

Field	Value
Publication number	US-9821419-B2
Application number	US-201314433183-A
Country	US
Kind code	B2
Filing date	Oct 8, 2013
Priority date	Oct 10, 2012
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

The method for manufacturing a heat exchanger plate includes a lid groove closing process to insert a lid plate into a lid groove formed at a periphery of a concave groove opening to a surface of a base member; and a primary joining process to perform friction stirring while relatively moving a primary joining rotary tool equipped with a stirring pin along a butting portion of a side wall of the lid groove and a side surface of the lid plate, and in the primary joining process, the rotating stirring pin is inserted into the butting portion, and the friction stirring is performed in a state of only the stirring pin being in contact with the base member and the lid plate.

First claim

The invention claimed is:

1. A method for manufacturing a heat exchanger plate, comprising:
a closing process to overlay a lid plate on a front surface of a base member to cover a concave portion or a concave groove opening to the front surface of the base member;
a primary joining process to insert a rotary tool equipped with a stirring pin from a front surface of the lid plate, and to move the rotary tool along an overlapped portion of the front surface of the base member and a back surface of the lid plate; and
a deburring process to remove burrs generated by friction stirring using the rotary tool after finishing the primary joining process,
wherein the stirring pin has a tapered shape so as to have a smaller diameter as it goes away from a base part of the stirring pin and has a continuous spiral groove formed on an outer peripheral surface, the spiral groove configured to rotate in a counter-clockwise direction as it goes downward when the rotary tool is used for rotating in the clockwise direction, and the spiral groove is configured to rotate in the clockwise direction as it goes downward when the rotary tool is used for rotating in the counter-clockwise direction, and
wherein, in the primary joining process, friction stirring is performed to the overlapped portion with the base part of the stirring pin being exposed in a state of only the stirring pin of the rotary tool being in contact with both of the base member and the lid plate or with only the lid plate while plastically fluidized material does not flow into the concave portion or the concave groove.

2. A method for manufacturing a heat exchanger plate, comprising:
a closing process to overlay a lid plate on a front surface of a base member to cover a concave portion or a concave groove opening to the front surface of the base member;
a primary joining process to insert a rotary tool equipped with a stirring pin from a back surface of the base member, and to move the rotary tool along an overlapped portion of the front surface of the base member and a back surface of the lid plate; and
a deburring process to remove burrs generated by friction stirring using the rotary tool after finishing the primary joining process,
wherein the stirring pin has a tapered shape so as to have a smaller diameter as it goes away from a base part of the stirring pin and has a continuous spiral groove formed on an outer peripheral surface, the spiral groove configured to rotate in a counter-clockwise direction as it goes downward when the rotary tool is used for rotating in the clockwise direction, and the spiral groove is configured to rotate in the clockwise direction as it goes downward when the rotary tool is used for rotating in the counter-clockwise direction, and
wherein, in the primary joining process, friction stirring is performed to the overlapped portion with the base part of the stirring pin being exposed in a state of only the stirring pin of the rotary tool being in contact with both of the base member and the lid plate or with only the base member while plastically fluidized material does not flow into the concave portion or the concave groove.

3. The method for manufacturing a heat exchanger plate according to claim 1 , further comprising a preliminary joining process to preliminarily join the overlapped portion before the primary joining process.

4. The method for manufacturing a heat exchanger plate according to claim 2 , further comprising a preliminary joining process to preliminarily join the overlapped portion before the primary joining process.

Assignees

• Nippon Light Metal Co

Inventors

• Hori Hisashi
• Seo Nobushiro

Classifications

• B23K20/24

  Preliminary treatment · CPC title

• Y10T29/4935

  Heat exchanger or boiler making · CPC title

• B23K20/1255 Primary

  Tools therefor, e.g. characterised by the shape of the probe · CPC title

• B23K20/002

  specially adapted for particular articles or work (B23K20/129 takes precedence) · CPC title

• B23K20/125 Primary

  Rotary tool drive mechanism · CPC title