Method of joining two metal members
AssigneeHitachi, Ltd.
InventorsHisanobu Kanamaru, Akira Tohkairin, Hideo Tatsumi, Naotatsu Asahi, Mitsuo Haginoya
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Abstract
In a method of joining two metal members by forming an annular groove at least on one of the two metal members to be joined and causing part of the material of the metal member to flow into the annular groove by plastic deformation to form a joint, at least one annular angled member is formed in the annular groove. The annular angled member extending the entire periphery of the annular groove is substantially triangular in axial cross-sectional shape. The joint has increased strength and can be formed with reduced pressure.
Claims15
A method of joining two metal members, each having a joining surface arranged in such a manner that the joining surfaces of the two metal members are in spaced juxtaposed relation, by way of a third metal member comprising the steps of:
- forming an annular groove on each of said joining surfaces of said two metal members;
- inserting a metal ring, of which said third member is comprised, in a gap defined between the joining surfaces of said two metal members;
- and
- applying pressure to said connecting ring to cause part of the material thereof to flow into said annular groove, to form a joint;
- wherein the improvement comprises the steps of:
- forming in each of said annular groove, simultaneously with or after forming said annular groove, at least one annular angled member having a height h that is substantially smaller than the depth H of said annular groove in accordance with the relationship 1/2H.ltoreq.h.ltoreq.(7/8)H and being substantially triangular in shape in axial cross section.
A method of joining two metal members, each having a joining surface, one of said metal members having a higher deformation resistance than the other, comprising the steps of:
- forming an annular groove on the joining surface of the one of said two metal members having higher deformation resistance;
- arranging the two metal members in such a manner that the joining surfaces of the two metal members are in juxtaposed relation;
- and applying pressure to the other metal member of lower deformation resistance to cause part of the material thereof to flow into said groove to form a joint;
- wherein the improvement comprises the step of:
- forming in said annular groove, simultaneously with or after forming said annular groove, at least one annular angled member having a height h that is substantially smaller than the depth H of said annular groove in accordance with the relationship 1/2H.ltoreq.h.ltoreq.(7/8)H and being substantially triangular in shape in axial cross section.
Dependencies are inferred from the claim text.