JPS58138573A - Welding method of mast rail - Google Patents

Abstract

PURPOSE:To make a titled welding method very advantageous in respect of man- hour, by positioning a web plate and a flange plate in the beginning, and continuously executing the continuous welding in the lengthwise direction through roll-molding of a bead part. CONSTITUTION:One web plate W and two flange plates F1, F2 being each independent member to be welded are collected on a roll jig 10, and they are constituted so as to obtain, for instance, an I-shaped section by roll group, by giving constant feed to the web plate W and the flange plates F1, F2 by a driving means. Subsequently, to said each combined corner part R guided by roll groups 11, 12 and 13, padding welding is performed by plural welding torches 14. On the front stage of the welding torch 14, a rolling roll 15 corresponding to each corner part R is provided, a bead part E immediately after welding is rolled and molded, also foams and fine holes are removed, and the whole bead part E is equalized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for welding a mast rail of a forklift.

Traditionally, forklifts have an H-shaped cross section or! The following methods are used to weld mast rails. Figure 1 (4) to (C)ti one web board W
In the case of welding a pair of 7-lunge plates F, , F, and a pair of 7-lunge plates F, , F, the web plate W is placed on the upper surface of the protrusion 2 of the jig board 1, and the protrusion 2 is placed on both sides of the web plate W. The pair of flange plates Fl a F are positioned and set so that they are parallel to each other, and then the clamp bolts 8 are tightened to place the web plate W and the 72 inch plate F1 * PI in a certain positional relationship. to be restrained. Then, a corner weld is manually performed using a welding torch 4 on the upper surface side of the abutting portion between the web plate W and the flange plate Fl t FI.

Next, if the welding on the upper surface side is not completed, then
After loosening and inverting the semi-finished product, temporarily fix the Tsutsunji plate F1 t' with a paring material llK, butt the other side of IIO in the same way as above and weld it, and finally remove the paring material B] This results in a mast rail with an H-shaped or ttI-shaped cross section.

However, in this conventional mast rail welding method, the welding jig is used across the entire length of the mast rail, which creates a smell of harassment and restricts financial resources in all directions. T5 rounding, web 1:・It is impossible to automatically weld both sides of the center alignment part of the plate and the 7 lunge plate at the same time), so it is impossible to set it on the jig or to use the paring material. There is a problem in that it takes only one effort to install and remove, which is disadvantageous in terms of man-hours.

This invention has been made in view of the above-mentioned points, and it is possible to consistently and automatically perform the machining, positioning of the web plate and 7-lunge plate, welding, and rolling trench of the bead part when manufacturing the mast rail. The object of the present invention is to provide a method of welding a mast rail that can be obtained.

Next, one embodiment of the present invention will be described in detail with reference to the drawings of FIGS. 2 to 4.

First, in the present invention, one web plate W and two 7-lunge plates 'l, each of which is a separate and independent member to be welded, are used.
#Fl are collected in the roller jig 10, and by applying a constant feed to the web plate W and the 7 lunge plate 'l t 'l by a driving means (not shown), the web plate W is moved by the roller group. and 7 lunge plate Fl e 'l are H-shaped or! The web plate W and the seven flange plates Fl m are constrained and guided in a predetermined relative positional relationship so as to form a cross section of the same shape.
0 is 7 tsunji ays.

F
Similarly, a plurality of second tabs 1 that control the positioning of the web plate WOW in the thickness direction! and,? Nib@W and 7 lunge plate F
The rollers 11, 11.18a are mainly configured with a plurality of eighth rollers 18 that control the positioning in the height direction of the rollers 11, 11.18a, and maintain a constant positional relationship with each other. %A stone can be rotated freely.

However, as mentioned above, fCa-2 $11.1! j.

The web board W is guided by 18 and runs in its longitudinal direction.
and 7 lunge plate 'l*Fl are the roller group 11
．． 1! , 18, and a plurality of nine welding torches 14 are used to perform corner welding on the corner R of each combination from both sides. wife)
, a pair of welding torches 14 are arranged on one side of the web plate W, and the web plate W and the flange plate '1 aF are formed into an H shape or! The four corners R formed by combining the shapes and the mourning joints become the joints on which the fillet S* is applied all at once. The welding torch 14 referred to as ζζ is of a conventionally well-known automatic type in which a wire is led out from the torch itself. ? - Longitudinal feed to web plate W and flange plate 'l * 'I]
be given! , each corner R is continuously welded.

In the feeding direction of the web plate W and the flange plate FlsF, each corner R is provided at the front stage of the welding torch 14.
Since rolling W-916 corresponding to
Immediately after welding, the bead IIN is rolled by the rolling row 21b to remove valuable waste air bubbles and pores, and to correct the cracks, thereby making the bead toden as a whole uniform. As a result, a mast rail with excellent welding reliability and uniformity can be obtained.

1D According to this embodiment, the web plate W and the flange plate 'l
* The ability to consistently perform continuous welding in the longitudinal direction and rolling forming of the bead part in positioning with the I D s is also very advantageous in terms of man-hours.

As described above, according to the method of the present invention, the conventional work of setting on a jig and attaching/removing the bar material for temporary fixing is no longer necessary, and the process from positioning the workpiece to continuous welding and The fact that everything up to the rolling forming of the bead portion can be performed automatically is extremely advantageous in terms of man-hours, and also has the effect of making it possible to mass-produce uniform mast rails.

[Brief explanation of drawings]

Figures 1 (4), (B) and (C) are ninth explanatory diagrams explaining the steps of the conventional mast rail welding method, and Figure 2 is a rounded explanatory diagram explaining the mast rail welding method of the present invention. , FIG. 3 is an enlarged front view of the main part of FIG. 2, and FIG. 4 is a side view of FIG. 8. □ W...Web plate s'l*'l...7 lunge plate, 10...roller jig, 11...first roller, 1
2... 20th roller, 1B... 8th four-ra, 14
... Welding torch, 16... Rolling roller, Tobi... Bead part. 33 Figure 1 (A) 211 Figure 3 Figure 4

Claims (1)

[Claims] (1) The web plate and the 7-tsunge plate, which are the materials to be welded, are combined to form a predetermined cross-sectional shape O! In the mast rail welding method, the web plate and the flange plate are guided by a group of helmets and lathes that restrain the web plate and the flange plate in a predetermined relative positional relationship as shown in FIG. After moving the web plate and the 7-lunge plate in a certain relative position with respect to the above-mentioned part, weld the web plate and the 7-lunge plate together with a welding torch. A method for welding a mast rail, characterized in that rolling forming is performed at a rolling groove having a constant relative positional relationship with the second group of rows.