Joined component and method for manufacturing joined component

Patent metadata

Field	Value
Publication number	US-10788069-B2
Application number	US-201515562108-A
Country	US
Kind code	B2
Filing date	Nov 26, 2015
Priority date	Mar 30, 2015
Publication date	Sep 29, 2020
Grant date	Sep 29, 2020

Abstract

It is an object of the present invention to provide a joined component in which the overflow of brazing filler metal from the outer peripheral line of a joint boundary surface between a first member and a second member is suppressed, and a method for manufacturing the joined component. A joined component is obtained by joining, with brazing filler metal, a first member and a second member to each other at a joint boundary surface where the first member and the second member are in contact with each other, the joined component having a non-contact area that is provided on an inner side with respect to an outer peripheral line of the joint boundary surface and in which the first member and the second member are not in contact with each other. In the joined component, the first member has a retaining recess where the brazing filler metal that is melted when the first member and the second member are joined to each other is retained, the retaining recess providing the non-contact area. The molten brazing filler metal including some solidified part forms a brazing-filler-metal pool in the retaining recess.

First claim

The invention claimed is:

1. A joined component obtained by joining with brazing filler metal a first member and a second member to each other at a joint surface, comprising:
the first member comprising a plurality of pillars axially extending from an inner face thereof, each pillar defining a joint surface having a retaining recess formed therein;
wherein each retaining recess has a bottom surface, an outer annular sidewall and an inner annular sidewall, wherein the outer annular sidewall surrounds and connects with the bottom surface, and the inner annular sidewall is opposite to the outer annular sidewall and connects with the bottom surface; and
the second member comprising a plurality of grooves formed within an inner face thereof, the grooves being correspondingly shaped to receive the pillars therein, each groove defining a joint surface having a through hole defining a sidewall extending therethrough in a position corresponding to a respective one of the retaining recess;
wherein brazing filler metal is placed within the retaining recesses and the pillars are received within the grooves such that the joint surfaces of corresponding pillars and grooves are spaced by a gap therebetween, and wherein the sidewall of each through hole is surrounded by the outer annular sidewall of the corresponding retaining recess, such that, in a cross-sectional view, opposing cross-sectional sidewalls of the through hole are positioned between opposing cross-sectional outer sidewalls of the retaining recess; and
wherein the brazing filler metal is melted such that molten filler metal fills each retaining recess to form a brazing filler metal pool therein and flows between the opposing joint surfaces of each corresponding pillar and groove to form a brazing filler metal joining portion which joins the joint surfaces, and such that excess molten filler metal flows into the through holes.

2. The joined component according to claim 1 , wherein each retaining recess has a depth of 0.3 mm or greater.

3. The joined component according to claim 1 , wherein the outer annular sidewall of each retaining recess forms an inclined surface.

4. The joined component according to claim 3 , wherein an angle of the inclined surface is 30° or greater and 85° or smaller.

5. The joined component according to claim 1 , wherein the first member and the second member are each a sintered body.

6. The joined component according to claim 1 , wherein the bottom surface of each retaining recess is a planar surface.

7. The joined component according to claim 1 , wherein the bottom surface of each retaining recess has a circular shape.

8. A method for manufacturing a joined component obtained by joining a first joint surface of a first member and a second joint surface of a second member to each other with brazing filler metal, the method comprising:
providing the first member comprising a plurality of pillars axially extending from an inner face thereof, each pillar defining a joint surface having a retaining recess formed therein;
wherein each retaining recess has a bottom surface, an outer annular sidewall and an inner annular sidewall, wherein the outer annular sidewall surrounds and connects with the bottom surface, and the inner annular sidewall is opposite to the outer annular sidewall and connects with the bottom surface;
providing the second member comprising a plurality of grooves formed within an inner face thereof, the grooves being correspondingly shaped to receive the pillars therein, each groove defining a joint surface having a through hole defining a sidewall extending therethrough in a position corresponding to a respective one of the retaining recesses;
placing brazing filler metal into the retaining recesses, and assembling the pillars within the grooves such that the joint surfaces of corresponding pillars and grooves are spaced by a gap therebetween, wherein the sidewall of each through hole is surrounded by the outer annular sidewall of the corresponding retaining recess, such that, in a cross-sectional view, opposing cross-sectional sidewalls of the through hole are positioned between opposing cross-sectional outer sidewalls of the retaining recess; and
melting the brazing filler metal by performing heat treatment, wherein molten brazing filler metal fills each retaining recess to form a brazing filler metal pool therein and flows within the gap between the first joint surface and the second joint surface of each corresponding pillar and groove to form a brazing filler metal joining portion which joins the first joint surface and the second joint surface to each other, wherein the gap spreads across the first joint surface and the second joint surface, and such that excess molten filler metal flows into the through holes.

9. The method for manufacturing a joined component according to claim 8 , wherein the following condition is satisfied: 1.5<W/(V×D)≤5, where D denotes a true density of the brazing filler metal, W denotes a mass of the brazing filler metal that is placed into the retaining recesses and V denotes a capacity of each retaining recess, and wherein D is in g/cm 3 , W is in g, and V is in mm 3 .

10. The method for manufacturing a joined component according to claim 8 , wherein each retaining recess has a depth of 0.3 mm or greater.

Assignees

• Sumitomo Electric Sintered Alloy Ltd

Inventors

• Uozumi Masato
• Kimura Yosuke

Classifications

• B23K1/18 Primary

  circumferential seams, e.g. of shells · CPC title

• F16B5/08 Primary

  by means of welds or the like (welding B23K) · CPC title

• B23K1/19

  taking account of the properties of the materials to be soldered · CPC title

• B23K1/14

  specially adapted for soldering seams · CPC title