JPH10167056A - Manufacturing method for structural body by hollow shape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify positioning of a welding connecting part of large hollow shapes by automatizing adjustment by an automatic welding machine having a sensor to search for projections by using the shapes provided with the projections in the neighbourhood of points to be the welding parts of the large hollow shapes. SOLUTION: A projection 3 is provided in the neighbourhood of a welding point which is a connecting part of large hollow shapes 1, 2 in case of constituting three blocks of a side, a roof and an underframe of a railway rolling stock structural body. Welding assembly of each of the blocks is carried out by setting the shapes 1, 2 in parallel and fixing them on a jig, making a weld line vertical with a nozzle of a welding machine, searching for the projection 3 in the neighbourhood of the welding point by a sensor and matching a position of the nozzle and height to the welding to each other. They are previously decided by inputting a distance and a distance in the height direction to the projection 3 and a head end of the nozzle to the automatic welding machine so that a distance of all the welding points and the projection 3 becomes constant, and welding is carried out by travelling the automatic welding machine in the longitudinal direction of the body. Consequently, it is possible to easily carry out preparation work of positioning, etc., before welding work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a structure using a hollow profile.

[0002]

2. Description of the Related Art The structure of a railway vehicle is roughly divided into a side, a roof, a wife, and an underframe. A large hollow profile is used for the underframe of some aluminum vehicle structures. I have. Welding of this hollow profile is automated by some vehicle manufacturers, but it takes time and effort to position the weld joint and to locate the sensor search of the automatic welding machine.

[0003]

According to the prior art method, first, a profile is juxtaposed and fixed to a jig. It is necessary to move the nozzle of the welding machine to the position of the welding point, and also to make adjustments in the vertical direction, and it is desired to reduce the preparation work before this work.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method capable of relatively easily positioning a welded joint between large hollow members and facilitating automatic welding.

[0005]

SUMMARY OF THE INVENTION In order to solve the problems of the prior art, a sensor having a projection provided near a portion to be welded to a large hollow profile is used. By automating the adjustment with an automatic welding machine having
Preparation work before welding can be performed relatively easily, and improvement in accuracy can be expected.

[0006]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail with reference to FIGS.

FIG. 1 is a cross-sectional view showing the vicinity of a joint (welding point) of a large hollow material constituting a structure.
A projection 3 is provided in the vicinity of a welding portion, which is a joint between the profiles 1 and 2. Further, the welded portion between the shaped members extends in the longitudinal direction of the vehicle body. A case where automatic welding is performed at a welding position of a profile having such a structure will be described below.

[0008] In general, a railway vehicle structure has side, roof, underframe,
It is divided into four blocks of the wife structure. 2, the side 10, the roof 20, and the underframe 3 of the railway vehicle structure, as shown in FIG.
When the three blocks 0 are made of a large hollow material, they are welded and assembled for each block as before, and finally each block is assembled. In the welding assembly of each block, first, the members are arranged side by side on a jig and fixed. that time,
Ensure that the weld line is perpendicular to the welder nozzle. Next, the sensor is used to search for protrusions near the weld,
Adjust the nozzle position and height above the weld. These are determined by providing a projection on the profile in advance so that the distance between all the welding points and the projections is constant, and inputting this distance and the distance in the height direction from the projection to the nozzle tip into the automatic welding machine. I do. After positioning in this manner, welding is performed by running the automatic welding machine in the longitudinal direction of the vehicle body.
For a part where welding is not to be performed, the projection of the part is removed in advance, and a program should be set up in the automatic welding machine so that welding is not performed for a part where the projection cannot be detected.

The above-mentioned method has no problem when the position in the height direction of all the welding lines such as the underframe is horizontal and the nozzle of the welding machine is always perpendicular to the welding line. For structures having curved lines, such as roofs and roof structures, the nozzle of the welder may not be perpendicular to the weld line.

An example for obtaining the verticality is shown in FIGS. FIG. 3 shows a state in which the roof block 20 is fixed to a jig, and FIG. 4 is an enlarged view of the joint 22. As shown in FIG. 3, since the roof block has a curved cross section, it is necessary to incline the nozzle N of the welding machine when welding the joints 21 and 22. In order to automate this inclination, FIG.
As shown in (1), projections 23 and 24 are provided on both sides near the joint. As described above, in order to detect the projection and determine the position of the nozzle N, the nozzle N has a structure that can be tilted as shown in FIG. 4, and is perpendicular to the line connecting the projection 23 and the projection 24. It is good to program so that it becomes. According to this method, automatic welding can be performed on a side structure or a roof structure having a curve. In addition, the projection for the automatic welding machine to search must be cut off in appearance.
Therefore, if the projections 25 and 26 are provided at positions covered by the welding beads W as shown in FIG. 5, the projections are also cut at the same time as finishing the grinder after welding. It is more advantageous than providing.

[0011]

As described above, according to the present invention, the side, roof, and roof of a railway vehicle structure constituted by large hollow members are used.
By providing a projection near the welded portion of the underframe for the automatic welding machine to search, it is possible to easily perform a preparation operation such as positioning before the welding operation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the vicinity of a joint portion of a large hollow member constituting a structure.

FIG. 2 is a diagram showing a configuration of a structure made of a large hollow member.

FIG. 3 is a diagram showing a state where the roof structure 20 is fixed to a jig.

FIG. 4 is an enlarged view of a welding portion 22.

FIG. 5 is another example of a welded portion.

[Description of Signs] 1,2: Shaped material, 3: Projection, 10: Side structure, 20: Roof structure, 30: Underframe, 21, 22, ... Joint (weld), 23
26 to protrusions.

Continued on the front page (72) Inventor Sumio Okuno 794, Higashi-Toyoi, Kazamatsu City, Yamaguchi Prefecture Inside the Kasado Plant of Hitachi, Ltd.

Claims (2)

[Claims] 1. A structure in which large hollow sections are juxtaposed along the longitudinal direction of a vehicle body and joined by welding in the longitudinal direction to produce a structure. A method of manufacturing a structure, comprising a projection for searching. 2. A method according to claim 1, wherein said projection for detecting by a sensor of said automatic welding machine is incorporated in advance as a part of a hollow member.