JPH0777676B2 - Work following welding method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of welding a curved surface of one work to another flat work.

2. Description of the Related Art Conventionally, when welding a flat plate-shaped work on the other side to a curved surface having a large radius by one work, the flat plate-shaped work 1 is conventionally press-molded as shown in FIGS. 7 and 8. Etc., the curved surface 2a of the other workpiece 2 to be welded is curved to the same radius, and the curved plate-shaped workpiece 1 is placed on the curved surface 2a of the one workpiece 2. The work 1 was clamped by the positioning clamp device, and the periphery of the flat work was welded and joined.

However, the flat plate-shaped work 1 curved in advance to a large radius by press molding or the like has a problem that it is difficult to obtain work accuracy because springback is likely to occur, and as a result, when work accuracy is not good, When clamped by the positioning clamp device, a gap is created between the curved flat plate-shaped work 1 and the curved surface 2a of the one work 2, which causes welding defects such as holes. It was

Therefore, in the conventional art, the curved flat plate-shaped work 1 is used.
Even if a springback occurs, a large number of clamp devices are used so that no gap is created between the flat work 1 and the curved surface 2a of the one work 2, or a large clamp device 3 is used as shown in FIG. Then, the entire flat plate-shaped work 1 is clamped so as to be in close contact with the curved surface 2a of the one work 2, and the peripheral edge of the flat plate-shaped work 1 is the curved surface of the one work 2.
It was welded and joined to 2a.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, a press die is required to curve-form a flat work 1 into a predetermined radius by press forming. It was necessary to perform a press forming step of forming the workpiece in a curved shape in advance. Further, there is a problem that the welding equipment itself becomes expensive because a large-sized clamp device or a large number of clamp devices are used.

Further, Japanese Utility Model Laid-Open No. 55-38536 discloses a restraint jig that restrains a restraint surface evenly. This relates to a restraint tool used for welding or can manufacturing work of a thin plate structure such as a vehicle or a building, and another plate which is formed in advance on a curved surface of one work according to the radius of the curved surface of the work. Described is a restraint tool capable of uniformly restraining the entire constraining surface even when pressing the constraining surface of a plate-like workpiece placed on a curved surface from one direction when joining workpieces in the shape of a weld by welding. . However, this restraint merely allows a plate-shaped work that has been curved in advance to be brought into close contact with the curved surface of the other work, and a press-molding step for the plate-shaped work is still necessary.

Further, Japanese Patent Application Laid-Open No. 57-56198 describes a method for manufacturing a composite metal strip, which is a method of arranging three or more long metal strips of different kinds so as to be in contact with each other in the width direction. A method of manufacturing one metal strip by welding so that there is no gap between each mutual tangent line, and when pressing three jigs each having a narrow path of three widths side by side, a pressing device from both sides It is pressed by and is brought into close contact, and welding is sequentially performed on the downstream side.

This invention has been made in view of the above problems, omits a step for preliminarily forming a flat work piece such as a press forming step, eliminates the need for a press forming die, etc. The purpose is to provide a welding method that does not cause welding defects such as perforations.

Means for Solving the Problems As a means for solving the above problems, the present invention is to join the curved surface of one workpiece to the curved surface of the other workpiece by welding. Of a flat work is used as a shaping surface when curvedly shaping, and a flat work is placed on the shaping surface, and at least one position of the flat work is pressed by a positioning clamp device. After closely fixing to the shaping surface and fixing, press the specified part of the flat work with a clamping device with a pressing surface that matches the shape of the shaping surface and bend it to conform to the shape of the shaping surface. It is characterized in that it is molded and brought into close contact with this shaping surface, and a plate-shaped work is welded to the curved surface of one of the shaping surfaces.

Action According to the above method, a flat plate-shaped work is placed on the curved surface of one of the works and fixed by the positioning clamp device, and then the flat plate-shaped work is pressed by the forming clamps to the desired positions. By closely adhering to the curved surface which is the shaping surface, the curved surface is shaped in accordance with the shape of the curved surface. In this state, the flat plate-shaped work and one work having the curved surface are joined by welding.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

The first work 11 having an arcuate curved surface 11a with a large radius
Is a steel member (see FIG. 4) having a grooved cross section with lip portions 11b, 11b on both sides opened, and a flat second workpiece.
Reference numeral 12 denotes a steel plate, which is a member joined by welding so as to close the open portion of the first work 11, and has two positioning pins that stand upright on both sides of a welding jig to be described later and are inserted therethrough. Holes are formed as circular insertion holes 11d and 11d in the bottom portion 11c of the first work 11 having a groove-shaped cross section, and long holes 12a and 12a in the flat plate-shaped second work 12.

On the other hand, the welding jig 13 for fixing the first work 11 when carrying out the method of the present invention has three support legs 15, 1 on the base 14.
6, 17 are arranged in a straight line at substantially equal intervals, and the central support leg 15 of these support legs 15, 16, 17 is arranged on a center line CL passing through the center of the welding jig 13. Along with
The height is slightly higher than the supporting legs 16 and 17 on both sides, and the upper end of each of these three supporting legs 15 and 16.17 can support the first work 11 curved in an arc shape.

Positioning pins 18 and 18 are provided on the upper portions of the support legs 16 and 17 on both sides, respectively, on a straight line connecting the support legs 16 and 17 and at positions substantially symmetrical with respect to the center line CL of the welding jig 13. The brackets 16a, 17a are vertically provided with their lower ends fixed, and the tips of both positioning pins 18, 18 are projected higher than the support legs 15, 16, 17.

On the other hand, on the center line CL above the welding jig 13, that is, substantially directly above the center support leg 15, a positioning clamp device 19 is provided so as to be vertically movable by a hydraulic cylinder (not shown), and Molding clamp devices 20, 20 are provided directly above the positioning pins 18, 18 so as to be vertically movable by a hydraulic cylinder (not shown), and at the lower ends of the molding clamp devices 20, 20, respectively. Is the first work 11
The pressing surfaces 20a, 20a are fitted to the curved surface of the circular arc, and the pressing surfaces 20a are each formed with a recess 20b so as not to interfere with the positioning pin 18 when descending.

Then, the first work 11 having a groove-shaped cross section has a lower surface side by each upper end of the support legs 15, 16 and 17 in a state where the outer peripheral side of the arc shape and the open side provided with the lip portion 11a face upward. Support and fix. At this time, the tip ends of the positioning pins 18, 18 provided on the support legs 16, 17 on both sides are respectively inserted into the insertion holes 11d, 11d formed in the bottom portion 11c of the first workpiece 11 having a groove-shaped cross section. The center line CL of the welding jig 13 is the central portion of the section where the second work 12 is welded on the first work 11.
Position so that it is on top. Furthermore, each positioning pin 18
Of the first work 11 vertically projects further upward from the upper portion of the first work 11 provided with the lip portion 11b.

The flat plate-shaped second work 12 is placed on the first work 11 and has long holes formed in the vicinity of both ends of the second work 12.
The tip ends of the positioning pins 18, 18 are inserted into the 12a, 12a. At this time, the tip ends of the positioning pins 18, 18 contact the center sides of the inner peripheries of the elongated holes 12a of the second work 12 and are positioned in the length direction and the width direction, respectively (see FIG. 3). ) In this state, only the central part of the second work 12 contacts the central lip parts 11b, 11b of the first work 11 (see FIG. 4), and both end sides of the second work 12 are the second part.
It is separated from the upper surface of the work 12 (see FIG. 5).

Next, the positioning clamp device 19 is lowered, and the central portion of the second work 12 placed on the first work 11 is pressed downward to be brought into close contact with the upper surface of the lip portion 11b of the first work 11 and fixed. To prevent misalignment, then clamp device for both moldings 20,20
Is lowered and the vicinity of both ends of the flat plate-shaped second work 12 is pressed downward by the pressing surface 20a of each forming clamp device 20 to be curved, and the entire lower surface of the second work 12 is the lip of the first work 11. The second work 12 is curved and formed so as to be in close contact with the arcuate curved surface 11a of the portion 11b. At this time, the second work 12 curvedly formed following the curved surface 11a of the first work 11 has the positioning pins 18, 18 inserted into the long holes 12a, 12a of the second work 12, respectively. The width direction and the length direction are positioned by contacting both ends of the second work on the inner circumference of 12a (see FIG. 6), and both sides of the second work 12 are aligned as indicated by the chain double-dashed line in FIG. The first work that is the welding partner
It is curvedly formed so as to be at a predetermined position on the lip portions 11a, 11a on both sides of 11.

Then, the second work 12 curvedly formed in conformity with the curved surface 11a of the first work 11 is clamped at both ends by both forming clamp devices 20, 20, and both side edges thereof are subjected to arc welding or the like. The upper surface of the lip portion 11a of the first work 11 is welded. After the welding is completed, the positioning clamp device 19 and both forming clamp devices 20, 20 are moved up to weld the second work 12 together to form the first work 11
Is vertically lifted upward, removed from the positioning pins 18 and 18, and conveyed to the next step.

As described above, according to the method of this embodiment, the shape of the positioning hole formed in the flat plate-like work 12 is defined by the inner circumference of the long hole before the bending forming of the flat plate-like work 12. Since the escape hole for the positioning pin 18 at the time of bending is provided as the elongated hole shape, it is possible to prevent breakage of the positioning pin due to galling of the plate-like work, defective discharge of the work after welding, and the like.

In addition, in the work profile welding method of the above-described embodiment, the case where the curved surface serving as the shaping surface of the work is an arcuate curved surface has been described, but the invention can be applied to the case of a wavy curved surface or the like.

EFFECTS OF THE INVENTION As described above, the work profile welding method of the present invention is
After using the curved surface of one work as a shaping surface when bending the other flat work, press the flat work placed on this shaping surface with the positioning clamp device and fix it , A predetermined position of a flat plate-shaped work is pressed by a forming clamp device to curve-form to conform to the shape of the shaping surface, and in this state the plate-like work is welded to the curved surface of one work, It is possible to omit steps such as press molding that preforms curved workpieces in advance and eliminate the need for expensive molding dies used for press molding, etc., and it is possible to reduce the cost, and the workpieces can be closely attached to each other, such as perforating. It has the effect of preventing the occurrence of welding defects.

[Brief description of drawings]

1 to 6 show an embodiment of a work-profile welding method of the present invention. FIG. 1 is a front view showing a state in which a first work and a second work are set on a welding jig. 2 is an enlarged cross-sectional view showing the relationship between the positioning pin and both workpieces, FIG. 3 is a plan view of FIG. 2, and FIG. 4 is IV-I of FIG.
V sectional view, FIG. 5 is a sectional view taken along line VV of FIG. 2, FIG. 6 is a plan view showing the relationship between both workpieces and positioning pins clamped by a molding clamp, and FIGS. 7 and 8 are Fig. 7 shows a conventional welding method, Fig. 7 is a front view showing a press-formed plate-shaped work and a work having a curved surface, and Fig. 8 is an explanatory view showing a state in which both works are clamped and welded. . 11 …… First work, 11a …… Curved surface, 11b …… Lip part, 11
d …… insertion hole, 12 …… second work, 12a …… long hole, 13 ……
Welding jig, 15,16,17 …… Supporting leg, 18 …… Positioning pin,
19 …… Clamping device for positioning, 20 …… Clamping device for forming, 20a …… Pressing surface, CL …… Center line of welding jig.

Claims (2)

[Claims] 1. A curved surface of one work is joined to another flat work by welding, and the curved surface of the one work is used as a shaping surface when the flat work is curved. A flat plate-shaped work is placed on the shaping surface, and at least one position of the flat plate-shaped work is pressed by a positioning clamp device to be closely attached to the shaping surface and fixed, and then the shape of the shaping surface is obtained. With a clamping device for forming that has a matching pressing surface, a flat plate-shaped work is pressed at a predetermined location to conform to the shape of the shaping surface, and curved shaping is performed to adhere the shaping surface to the plate-shaped workpiece. A work-like welding method that welds to the curved surface of one of the workpieces that is the shape surface. 2. A jig having two locating pins which are opposed to each other and are spaced apart from each other in the relative direction from the center of the flat plate-like work is used, and the jig is provided at a position corresponding to each locating pin of the flat plate-like work. When the long hole is formed and the flat plate-shaped work is placed at a predetermined position on the shaping surface of the other work, the positioning pin inserted into each of the long holes is located on the work center side of each long hole. 2. The positioning according to claim 1, wherein when the curved hole is clamped by a molding clamp device and curvedly formed, the elongated hole is in contact with the inner circumference of the outer side of the work. Welding method for tracing work.