JPS58112689A - Mitering method for metallic member - Google Patents

Abstract

PURPOSE:To join cut end edges accurately to a prescribed bending angle with butt welding in producing a metallic member having a prescribed angle part by cutting off the metallic members which are supported at a prescribed bending angle along the centerline of the bending angle thereof. CONSTITUTION:An upper member (a) and a side member (b) are cut from blank materials for door sashes of vehicles which are beforehand molded to a prescribed cross sectional shape. The part corresponding to the width of the clearance (c) between the respective constituting members (a), (b) supported at a prescribed bending angle theta on a receiving base is cut off with a cutter (m) which assumes an angle 1/2theta the bending angle with respect to the angle part produced in said clearance (c) and moves along the centerline (l). Then, the respective end edges face each other in mutually parallel at a specified width (c) and at an angle of inclination of 1/2theta angle. Thereafter, both members are butted and are welded and fixed along the butt lines.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joining method for manufacturing a vehicle door nut, etc., which has a U-shape on the side surface, and in which the bent corners are welded and fixed. Conventionally, this type of door sash is made from a sash material that has been pre-formed to have a predetermined cross-sectional shape. When the edges are cut and formed diagonally at the bending angle θ and then abutted against each other, and then welded along the abutment, a two-way C2 is produced. Time C: corresponds to the desired bending angle θC:+H
It is extremely difficult to cut each end accurately at an angle of θ, and when they are butted together at an angle of θ, a gap C often occurs between them. This gap C has an extremely small dimension width. If there is a problem, it can be filled in by welding afterwards, but if it becomes large to a certain extent, excessive weld penetration will cause the weld to drop out.The metal component with the weld drop will be removed by removing the weld and removing the weld from the corner of the edge. After being removed and shaped, it is necessary to weld 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 occurrence of such gaps and achieves accurate welding between edges corresponding to the bending angle C.

That is, in joining method C according to the present invention, the metal member is supported at a predetermined bending angle on a pedestal, and a cutter that moves along the center line of the bending angle θ is used to scrape off a slight width from the corner of the metal member. After cutting, the edges are formed, the edges are butted together, and welded and fixed.

This will be explained below based on the third to fifth illustrated embodiments C.

In the illustrated embodiment, a door sack for a vehicle is manufactured by cutting an upper part a and a side part from a pre-formed nine-sash material with a predetermined cross-sectional shape C, and cutting each joint end separately (
：Beforehand, the edges of the component members a and b are welded together. C: It is possible to set the bending angle θ by a chuck on a pedestal, and a flash butt, TEG9 MIG, arc, etc. can be used for welding between each edge.

Predetermined bending angle θ (=9 each component a, b supported on the pedestal)
Seki C: has a slight gap C.

This corner C: For this, the center line that forms an angle θ with the bending angle θ! (: With a cutter m such as a milling machine that moves along the line, cut off a slight width, that is, the interval width of the gap C. After this scraping (2), a gap C' of a constant width between the edges C is cut. However, the edges are parallel to each other and opposite to each other at an oblique angle within %θ.

After these edges are abutted against each other by the close movement of each chuck, etc., they are welded along the abutment line (2) to each other 4: to be fixed at a diagonal 4: thus after the skew fixation. In the case of metal parts, the corners are accurately joined to a predetermined bending angle θ, and there is no gap at all when they are butted together, so there is no welding or dropping.In addition, the welded surfaces do not need to be polished with a grinder, etc. You can finish it with beautiful C2.

In addition, in the above-mentioned nine embodiments, each component member a, b is
Diagonal
It is completely (: Bend position 4 without cutting: Forming a 7-shaped notch and cutting after bending. C:
can also be applied. In this case (2), due to the formation of the V-shaped notch, a part of the 9 portion C2 remains due to the bending process C2, resulting in a thick build-up of the wall, but this can be completely removed by scraping and cutting. I can do it.

In addition, for vehicle door sashes, Upper Yu a.

Side 1iilb must be bent into a predetermined side shape as shown in the first figure, but the bending process can be done before welding as before. Bending of the ninth and at least upper sections, which may be deformed due to changes in stress, should be done after welding C:
It's good to do.

As described above, according to the present invention 5: the method for joining bent corners of metal members, corners can be reliably welded and fixed while maintaining a predetermined bending angle.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the conventional method (two-way bending corner joining process), w It is an explanatory diagram. a, b: metal member, θ: predetermined bending angle, !: center line,
Pn two cutters.

Claims (1)

[Claims] When manufacturing a metal member such as a vehicle door sash that has a corner with a predetermined angle and a side shape such as an approximately U-shape or a U-shape, the metal member The cutter moves along the center line 4 of the angle θ (= 1 lllll to A method for joining bent corners of metal members, characterized by the following: