JPH0221906B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a bending angle that is applied to welding and fixing a bent corner portion when manufacturing a vehicle door sash etc. that has a substantially U-shaped side surface. This relates to a method of joining parts.

Conventionally, a door sash having a side surface shape as shown in Fig. 1 has been made by cutting out an upper part a and a side part b separately from a sash material that has been previously formed to have a predetermined cross-sectional shape, and cutting them into a U- or U-shape. Usually, each end to be welded and fixed is separately cut obliquely at an angle of 1/2 of the bending angle, abutted against each other, and then welded along the abutment line.

Problem to be Solved by the Invention However, when cutting each end diagonally, it is extremely difficult to accurately cut each end diagonally at an angle of 1/2 corresponding to the desired bending angle. Even if they are butted together at a predetermined bending angle, a gap c as shown in FIG. 2 will occur between the ends. If this gap c is extremely small, it can be filled by subsequent welding, but if it becomes large to a certain extent, the weld will fall through due to excessive penetration. The metal member that has fallen off must be unwelded, the edges of the metal member be rounded, and then welded again, which is an extremely time-consuming process.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for joining bent corners of metal members that completely eliminates the generation of gaps and enables welding between ends according to accurate bending angles.

Means for Solving the Problems In the joining method according to the present invention, each component is positioned and held on a pedestal with a chuck, with the ends thereof being relatively positioned at an angle exhibiting a predetermined bending angle, and the chuck is used to hold the component. A cutter is moved along the center line of a predetermined bending angle between the ends of each component, and the cutter cuts off the end of each component diagonally according to the predetermined bending angle. The chucks that hold each component are moved toward each other while maintaining the angular shape, and the ends are butted together, and the ends are welded and fixed while each component is held by these chucks. .

Function: In this method of joining metal parts at bent corners, even if the ends of each component are not cut exactly as desired, each component can be chucked by positioning the ends relative to each other at an angle that provides a predetermined bending angle. After positioning and holding on a pedestal and cutting the ends with a cutter that moves along the center line of a predetermined bending angle, the ends are butted against each other and welded so as to maintain the angle that forms this predetermined bending angle. Not only can each component be reliably joined with the desired bending angle, but the ends can be cut at the same time with the same cutter, making it possible to perform the process efficiently and accurately. Since the rear ends are butted and even welded while being held in place by the chuck, it is possible to manufacture a product with a uniform side shape.

Embodiment The following will be described with reference to FIGS. 3 to 5.

In this embodiment, when manufacturing a door sash for a vehicle, parts A for the upper part and parts B for the side parts are cut from a sash material previously formed into a predetermined cross-sectional shape and used as structural members. In addition, these constituent members a and b are aligned at a predetermined bending angle θ in accordance with the process described below by positioning and holding the rear end portions of each of the joint ends separately formed diagonally in advance, so that these constituent members Welding is performed between the ends of a and b. The positioning and holding of each component member a, b can be done by holding it with a chuck installed on the pedestal of the welding machine so as to set it at a bending angle θ.Furthermore, the welding between each end can be performed using a flashbutt, a chig, MIG, ARC, etc. can be applied.

By positioning and holding the chuck, even if there is a slight gap c between each component member a and b supported on the pedestal at a predetermined bending angle θ, the bending angle θ Using a cutter m such as a towing ring that moves along the center line l that forms an angle of 1/2θ, a slight width, that is, the width of the gap c, is removed. After this cutting, a gap c' of a constant width is created between each end, but the ends are parallel to each other and face diagonally at an angle of 1/2θ. These ends are welded together by moving each chuck toward each other to maintain a predetermined bending angle θ and abutting each other, and then welding along the abutment line while holding component members a and b with each chuck. Can be fixed.

When the metal members a and b are welded together in this manner, the corners are accurately joined at a predetermined bending angle θ, and there is no gap at all when they are butted together, so there is no weld dropout. Additionally, the welded surface can be polished to a beautiful finish using a grinder or the like.

In addition, in the above-mentioned embodiment, in order to position and hold the structural members a and b, the structural members a and b are completely separated and the ends of the structural members a and b are positioned relative to each other. , it can also be applied to the case where a V-shaped notch is formed at the bending position and the bending process is performed and then the cutout is performed without completely cutting off. In this case, by forming the V-shaped notch, a thick bulge will occur in some of the remaining parts due to the bending process, but this can be completely removed by cutting with the cutter m. Further, in the case of a vehicle door frame, the upper side a and the side side b must be bent into a predetermined side shape shown in FIG. 1, but this bending process may be performed before welding as usual.
However, since the bent shape may be deformed due to changes in internal stress due to heating during welding, it is preferable to perform the bending process at least on the upper side a after welding.

As described above, according to the bending corner joining method of metal members according to the present invention, it is possible to reliably hold the bent corner at a predetermined bending angle and uniformly weld and fix the bent corner in an extremely efficient manner. It is something.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a bending corner joining process using a conventional method, Fig. 2 is an explanatory diagram showing a partially enlarged view of the same process, and Figs. It is an explanatory view showing a joining process of the bent corner part concerning. a, b: metal member, θ: predetermined bending angle, l: center line, m: cutter.

Claims (1)

[Claims] 1. When manufacturing a metal member such as a door sash for a vehicle, which has a corner with a predetermined bend angle and a side shape such as a substantially U-shape or U-shape, Each component is positioned relative to each other and held on the pedestal using a chuck, and a cutter is moved between the ends of each component held by the chuck along the center line of a predetermined bending angle. Cutting off the ends of each component diagonally according to a predetermined bending angle, and abutting the ends by moving the chucks that hold each component toward each other while maintaining the angle exhibiting the predetermined bending angle, A method for joining bent corners of metal members, characterized in that the ends are welded and fixed while each component is held by the chuck.