Method for producing liquid-cooled jacket

Abstract

Provided is a method for producing a liquid-cooled jacket with which it is possible to reduce the size of a recessed groove in a surface of a metal member and also reduce joining surface roughness. This method comprises: a placement step for placing a sealing body (3) on a jacket body (2); a first main joining step for performing friction stirring by causing a main joining rotary tool (F) to makea round with respect to a first overlapping part (J1); and a second main joining step for performing friction stirring with respect to a second overlapping part (J2). The main joining rotary tool (F)includes a base-end-side pin (F2) and a tip-end-side pin (F3). The taper angle (A1) of the base-end-side pin (F2) is greater than the taper angle (A2) of the tip-end-side pin (F3). A step-like pin step part (30) is formed on the outer circumferential surface of the base-end-side pin (F2). In the first main joining step and the second main joining step, friction stirring is performed in a state where the tip-end-side pin (F3) is in contact with both the jacket body (2) and the sealing body (3) or only the sealing body (3) and the base-end-side pin (F2) is in contact with the sealing body (3).

Description

technical field [0001] The invention relates to a method for manufacturing a liquid cooling jacket. Background technique [0002] As a rotary tool used for friction stir joining, a rotary tool including a shoulder portion and a stirring pin hanging down from the shoulder portion is known. The rotary tools described above are also used in the manufacture of liquid-cooled jackets consisting of jacket bodies and seals. The rotary tool performs friction stir welding in a state where the lower end surface of the shoulder portion is pressed into the metal member. By pressing the shoulder portion into the metal member, it is possible to press the plastic flow material and suppress the generation of burrs. However, defects are easily generated when the height position of the joint is changed, and there is a problem that the groove becomes large while generating a large number of burrs. [0003] On the other hand, there is known a friction stir welding method in which two metal me...

AI Technical Summary

Problems solved by technology

However, since the plastic flow material is not pressed by the shoulder portion, there is a problem that the grooves on the surface of the metal member become large and the roughness of the joint surface becomes large.

In addition, there is a problem that a raised portion (a portion where the surface of the metal member is raised compared to before joining) is formed in the vicinity of the groove.

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