In a link rod manufacturing method, a bracket material (14) having a ring portion and a mounting projection (15) is made by extrusion molding a material at the length corresponding to a plurality of brackets. On a forward end of the mounting projection (15), an engaging projection (17) with upper an
In a link rod manufacturing method, a bracket material (14) having a ring portion and a mounting projection (15) is made by extrusion molding a material at the length corresponding to a plurality of brackets. On a forward end of the mounting projection (15), an engaging projection (17) with upper and lower steps (7a, 7a) is formed. An arm (2) is made by extrusion molding and regular-size cutting a material in a substantially I-shaped configuration which has a pair of first and second walls (20, 21) parallel extending on upper and lower sides and a third wall (22) crossing at a right angle and connecting these walls. A notch (23) is formed on an end of the third wall (22). When the engaging projection (17) is engaged with the notch (23), each of ends of the first and second walls (20, 21) on the side of ends 2a of the arm 2 is fitted onto the step (7a, 7a) and butted against a vertical wall (17b). Surfaces in the vicinity of butted portions (6) formed in this way forms a plane tool traveling surface and are supported on the insides thereof by the engaging projection (17) to prevent deformation. Therefore, the friction stir welding is carried out along the butt portion (6).
대표청구항▼
What is claimed is: 1. A method of manufacturing a link rod which comprises an arm portion having a longitudinally extending configuration, and a bracket for mounting a bush being joined to an end in the longitudinal direction of said arm portion, wherein said arm portion has a pair of first and se
What is claimed is: 1. A method of manufacturing a link rod which comprises an arm portion having a longitudinally extending configuration, and a bracket for mounting a bush being joined to an end in the longitudinal direction of said arm portion, wherein said arm portion has a pair of first and second walls parallel extending to each other and a third wall connecting between said first wall and said second wall, comprising the steps of forming a notch on an end of said third wall in the longitudinal direction thereof, forming an engaging projection on said bush mounting bracket, engaging said engaging projection with said notch to support said first and second walls, butting each of ends in the longitudinal direction of said first and second walls against said bush mounting bracket such that a wall of said bush mounting bracket is butted against each of the ends of said first and second walls so as to form a plane tool traveling surface, and joining said arm portion to said bush mounting bracket by friction stir welding along the butt portion between each of the ends of said first and second walls and said bush mounting bracket. 2. The link rod manufacturing method according to claim 1, wherein more than one set of said arm portion and said bush mounting bracket being butted against each other is arranged in a horizontal row such that said butt portions between said arm portions and said bush mounting brackets extend continuously in the shape of a straight line, and wherein the friction stir welding is continuously carried out in one process step along said continuously extending butt portions, and then joined portions between neighboring sets of said arm portion and said bush mounting bracket are cut to be separated into each of link rods. 3. The link rod manufacturing method according to claim 2, wherein a spacer is interposed between said neighboring sets of said arm portion and said bracket which are arranged in a horizontal row, so as to cross at a right angle a continuously extending line of said butt portions such that said butt portions extend continuously along the entire length thereof through the intermediary of said spacer and such that a surface of said spacer is made flush with surfaces of said arm portions positioned on each side thereof to form the tool traveling surface with a continuous plane along the entire length thereof, wherein the friction stir welding is carried out along said continuously extending butt portions including said spacer, and then said spacer is cut to have link rods separated from each other. 4. A method of manufacturing a link rod which comprises an arm portion having a longitudinally extending configuration, and a bush mounting bracket being joined to an end in the longitudinal direction of said arm portion, wherein said arm portion has a pair of first and second walls extending in parallel with each other and a third wall connecting between said first and second walls, comprising the steps of forming a notch by cutting out an end in the longitudinal direction of said third wall of said arm portion, extrusion molding a bracket material for forming a plurality of said bush mounting brackets by being cut in the longitudinal direction thereof, having an engaging projection which is integrally formed with said bracket material, engaged with said notch of said third wall provided on the longitudinal end of said arm portion, butting the longitudinal end of said arm portion against said bracket material such that a wall of said bracket material is butted against each of ends of said first and second walls to form a flush tool traveling surface, arranging in a horizontal row in the longitudinal direction of said bracket material a plurality of said arm portions in a butted state against said bracket material, such that butt portions of said arm portions each are continuously formed in the shape of a straight line along the direction of the row, friction stir welding continuously each of said arm portions and said bracket material in one process step along said continuously formed butt portions, and cutting said bracket material at a predetermined width of a product in the longitudinal direction thereof to have link rods in a horizontal row separated into each link rod. 5. The link rod manufacturing method according to claim 4, further comprising the steps of interposing a spacer into between said arm portions arranged in a horizontal row, in the direction crossing at a right angle an extension line of said butt portions such that said butt portions are formed continuously along the entire length thereof through the intermediary of said spacer by butting an end of said spacer against said bracket material and a surface of said spacer is made flush with surfaces positioned in the vicinity of said butt portions to form a tool traveling surface with a continuous plane along the entire length thereof, friction stir welding said arm portions and said bracket material along said butt portions including said spacer, and then cutting said bracket material together with said spacer. 6. A method of manufacturing a link rod which comprises a longitudinally extending arm having a pair of first and second walls being formed in parallel in a cross section crossing at right angles the longitudinal direction of the arm and a third wall connecting between said first and second walls, and a bush mounting bracket having a bush mounting hole and being integrally formed with an engaging projection to be engaged between said first and second walls on an longitudinal end of said arm, wherein said bush mounting bracket is friction stir welded to and formed integral with the longitudinal end of said arm, comprises the steps of forming a bracket material by carrying out extrusion molding such that a cross section of an extrusion has a configuration of a front view of said bush mounting bracket when viewed from an axial direction of said bush mounting hole and is formed integral with said engaging projection and then by cutting the extrusion in the longitudinal direction thereof at such a predetermined length that a plurality of said bush mounting brackets are arranged in a horizontal row, forming an arm material by carrying out extrusion molding such that a cross section of an extrusion corresponds to such a cross section in the direction crossing at a right angle the longitudinal direction of said arm, that a plurality of said arms are arranged in a horizontal row, and such that the width of the extrusion corresponds to the cut length of said bracket material and then by cutting the extrusion in the longitudinal direction thereof at the predetermined length of said arm, notching each end in the longitudinal direction of said third wall with respect to said arm material to form a clearance in the case of having engaged with said engaging projection, arranging said bracket material and said arm material in such a state that the extrusion directions of these materials cross at right angle each other, so as to engage said engaging projection integrally formed with said bracket material between said first and second walls on the end of the extrusion direction of said arm material, having said first and second walls butted against said bracket material to form a butt portion in the shape of a flush and continuous straight line, friction stir welding said arm material and said bracket material in one process step along said butt portion, and then cutting such joined materials at the width of a product in the direction crossing at right angle the extrusion direction of said arm material.
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