Method of manufacturing liquid-cooled jacket

Abstract

A method of manufacturing a liquid-cooled jacket, includes a preparation step which includes placing a sealing body on a stepped portion to allow a step side surface and a sealing-body side surface of the sealing body to butt each other, and a primary joining step which includes allowing a primary joining rotary tool to move once around the sealing body, while moving the rotary tool along a butted portion formed in the preparation step, to carry out friction stir welding. The primary joining step includes employing the primary joining rotary tool provided with a stirring pin having a length dimension greater than a thickness dimension of the sealing body, and carrying out friction stirring with only the stirring pin being brought into contact with a jacket body and the sealing body.

1 . A method of manufacturing a liquid-cooled jacket which is composed of a jacket body having a bottom portion and a frame-shaped side wall portion provided to stand on the bottom portion, and a sealing body which seals a recess of the jacket body, and allows heat transport fluid to flow in a hollow portion formed by the jacket body and the sealing body, the method comprising:
 a preparation step which includes placing the sealing body on an end surface of the side wall portion to allow the end surface and a back surface of the sealing body to overlap with each other; and   a primary joining step which includes allowing a rotary tool to move once around the recess, while moving the rotary tool along a first overlapped portion overlapped in the preparation step, to carry out friction stir welding, wherein   wherein the primary joining step includes carrying out friction stirring with only stirring pin being brought into contact with both of the jacket body and the sealing body, or only the sealing body.   
     
     
         2 . The method of manufacturing the liquid-cooled jacket according to  claim 1 , wherein the liquid-cooled jacket includes a supporting portion formed on any one, and abutting another, of the bottom portion of the jacket body and the back surface of the sealing body. 
     
     
         3 . The method of manufacturing the liquid-cooled jacket according to  claim 1 , wherein the jacket body includes a supporting portion which stands on the bottom portion and abuts on the back surface of the sealing body, and
 wherein the primary joining step includes carrying out friction stir welding for a second overlapped portion at which the back surface of the sealing body and an end surface of the supporting portion are overlapped each other, in addition to friction stir welding for the first overlapped portion.   
     
     
         4 . The method of manufacturing the liquid-cooled jacket according to  claim 3 , wherein the supporting portion is formed to continue from the side wall portion, and
 Wherein the primary joining step includes continuously carrying out the friction stir welding for the first overlapped portion and the second overlapped portion.   
     
     
         5 . The method of manufacturing the liquid-cooled jacket according to  claim 3 , wherein the supporting portion is formed to continue from one wall portion including the side wall portion and to be kept away from another wall portion facing the one wall portion, and
 wherein the primary joining step includes:   inserting the rotary tool into a position corresponding to the supporting portion, on a front surface of the sealing body;   continuously carrying out the friction stir welding for the first overlapped portion and the second overlapped portion; and   pulling out the rotary tool from the sealing body outside a plasticized region formed in the first overlapped portion.   
     
     
         6 . The method of manufacturing the liquid-cooled jacket according to  claim 1 , wherein the primary joining step includes carrying out friction stir welding in a state in which a front surface side of the jacket body and a front surface side of the sealing body are in a convex shape. 
     
     
         7 . The method of manufacturing the liquid-cooled jacket according to  claim 6 , wherein the primary joining step includes measuring beforehand an amount of deformation of at least one of the jacket body and the sealing body, and carrying out friction stir welding while adjusting an insertion depth of the stirring pin according to the amount of deformation. 
     
     
         8 . The method of manufacturing the liquid-cooled jacket according to  claim 1 , wherein the primary joining step includes providing a cooling plate on the bottom portion of the jacket body, and carrying out friction stir welding while cooling the jacket body and the sealing body. 
     
     
         9 . The method of manufacturing the liquid-cooled jacket according to  claim 8 , wherein the primary joining step includes allowing a back surface of the bottom portion of the jacket body and the cooling plate to be brought into surface contact with each other. 
     
     
         10 . The method of manufacturing the liquid-cooled jacket according to  claim 1 , further comprising:
 a provisional joining step, prior to the primary joining step, of carrying out provisional joining for the first overlapped portion.