JPH04200972A - Welding groove cutting device for long size thick steel plate - Google Patents

Abstract

PURPOSE:To easily form welding grooves on both edges of the long size thick steel plate by providing preheating torches, groove cutting torches and cut remaining material cutting torches in opposition to width ends of the steel plates on a path of a roller conveyor to convey the long size thick steel plates. CONSTITUTION:Two long size thick plates 21 and 21, two thick steel plates 22 and 22 having the inclined surfaces for forming welding grooves 23 on both edges and square steels 20 for backing strips are arranged squarely and the grooves 23 are welded and square column steel pipe material is manufactured. The inclined surfaces are formed to form the grooves 23, on both edges the thick steel plates 22 in this case. While conveying the thick steel plates 22 in the arrow direction on rollers 1 for conveying, the torches 7 to preheat both edges thereof, the cutting torches 8 for forming the inclined surfaces for the grooves 23 and the cut remaining material cutting torches 9 are arranged in order. Since the thick steel plates 22 are preheated and cut in order by the above-mentioned three kinds of torches 7, 8 and 9 while being conveyed, the inclined surfaces for forming the grooves are easily formed on both edges of the thick steel plates 22.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is a process for welding long thick steel plates prior to manufacturing box-shaped square columns (square steel pipe columns) used as structural materials in buildings. This invention relates to a tip fusing device.

<Prior Art> A box-shaped square column (square steel pipe column) used as a structural material for a building is manufactured by welding four thick steel plates into a square shape. That is, as shown in FIG. 2, the square column is made up of two long thick steel plates 22 with long square steel plates 20 serving as backing metals welded to both ends, and the end faces of which are melted diagonally.
The long thick steel plate 21 was assembled using a simple long thick steel plate 21, and the long thick steel plate 21 was applied to a part of the square steel 20 welded to the long thick steel plate 22, and each end was butted to form a welding groove 23. After that, this groove 23 is integrated by performing CO2 gas shielded arc welding or ``bumerge arc welding''. By the way, the groove 23 is formed at the corner of the long thick steel plate 21 and the thick steel plate 22. In order to form this, it is necessary to cut the width end of the thick steel plate 22 diagonally.Also, as shown in FIG. and the thick steel plate 2 where the thick steel plate 22 contacts the square steel 20.
Width end of 2" - Surface B needs to be polished for proper welding.

When cutting the width edge of a thick steel plate by blowing oxygen gas diagonally downward from the groove fusing l--ch and using the combustion reaction heat that falls in the oxygen of the iron, first use the groove fusing torch. A fuel gas such as propane gas is ejected from a preheating latch placed close to the groove, and the combustion heat preheats the starting point of fusing the thick steel plate with the groove fusing torch to the ignition temperature, and also peels off surface scale. After cutting to facilitate reaction with oxygen,
Fusing is performed by blowing out oxygen gas from a groove fusing torch.

Conventionally, a preheating torch and a bevel fusing torch, which were placed so as to face each other at the width end of a long thick steel plate, were mounted on a concave trolley that ran on rails, and were placed stationary on a fusing workbench. A trolley is run at an appropriate speed along a thick steel plate, and the fuel gas ejected from the preheating l-chi is heated by combustion.
Subsequently, the width end portion of the steel plate (7) was cut diagonally downward by oxygen gas ejected from groove fusing l.-ch.

As this kind of diagonal downward fusing is performed at the width end of a thick steel plate, residual material is generated on both sides of the thick steel plate, but as the fusing work progresses, this residual material becomes long and hangs down, which is dangerous. The remaining material is cut into appropriate lengths for post-processing purposes, but in the past, workers used hand torches to cut the remaining material using their breaks in work. Furthermore, the thick steel plate whose width end was welded diagonally downward was transferred to a polishing workbench, and then the worker used a hand grinder to polish the measured surface of the width end and the top surface of the width end of the thick steel plate. Ta.

<Problems to be Solved by the Invention> In the above-mentioned prior art, the preheating torch and the bevel cutting torch are mounted on a concave cart, so there is no need for a mechanism to move the cart at a predetermined speed, or a mechanism for moving the cart at a predetermined speed. This requires additional equipment for extending the oxygen gas hose and the fuel gas hose to follow the trolley running along the thick steel plate, which poses a problem in that the equipment cost increases.

In addition, cutting the remaining material on both sides of the J7 steel plate into short pieces with a hand torch is not only dangerous, but also
It was extremely inefficient work. Furthermore, J! is performed after cutting the width end diagonally downward. The polishing work of the side surfaces and top surfaces of the width ends of the ir and lxJ plates using a hunt grinder was similarly inefficient.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a groove fusing device for welding a long thick steel plate, which can efficiently cut the width end portion of the long thick steel plate while conveying the same. The purpose is to

Means for Solving the Problem> The present invention to achieve the above-mentioned object is such that the width end of the thick steel plate conveyed by the roller conveyor is placed on the path of the roller conveyor that generally conveys the long thick steel plate. Preheating 1-- of preheating the width end portions of the thick steel plate from the upstream side, facing the respective portions.
H, groove fusing I--H, which cuts the preheated width end of the thick steel plate diagonally downward, and Zageki cutting, which cuts the remaining material generated by the diagonally downward fusing of the thick steel plate to a certain length. This is a groove fusing device for welding long thick steel plates, characterized in that torches are arranged adjacent to each other in sequence.

The present invention also includes a side grinder that is positioned downstream of the Zagetsu cutting torch on the path of a roller conveyor that conveys a long thick steel plate and grinds the side surface of the width end of the thick steel plate; It is desirable to arrange an upper surface grinder 7 for polishing the upper surface of the width end portion from the viewpoint of improving work efficiency.

<Function> Since the present invention has the above-described configuration, preheating I/
-chi and groove fusing 1 and -chi are not mounted on a gate-shaped trolley, and while conveying a long thick steel plate on a roller conveyor, the width end of the thick steel plate is heated with a preheating torch, and the groove cutting torch is used. In addition to the fusing operation, the remaining material can be automatically cut using a cutting torch.

Furthermore, the side surface and the top surface of the width end of the thick steel plate can be continuously polished by the side surface grinder and the top surface grinder arranged downstream of the remaining material 1.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. 1st
As shown in the figure, a plurality of conveyor rollers 1 are arranged at appropriate intervals on a conveyor frame 3 of a roller conveyor 10 via bearings 2, and a long thick steel plate 22 is moved over the conveyor rollers 1 in the direction of the arrow. transported to. Furthermore, support brackets 4 are arranged on the conveyor frames 3 on both sides, and a main frame 5 is fixed to each support bracket 4.

Furthermore, a bracket l-6 is attached to the main frame 5, and a three-piece wooden holder I-6 is suspended from the bracket l-6.
A roller conveyor 10 is provided for each of la, llb, and llc.
From the upstream side, a preheating torch 7, a groove fusing torch 8, and a residual material cutting 1, 9 are arranged adjacent to each other in order so as to face the width end of the thick steel plate 22.

Then, propane gas is supplied to preheating 1--chia via pipe +9a, oxygen gas is supplied to groove fusing torch 8 via pipe 19t+, and pipe 19 is supplied to residual material cutting I-chi 9.
Oxygen gas is supplied via c.

Furthermore, a support frame 1 is provided at the downstream end of the main frame 5.
The side grinder 13 is rotated by a drive device 14. The side grinder 13 is rotated by a drive device 14. An upper surface grinder 17 is mounted on the support stand 15 via a support frame 16, and the upper surface grinder 17 is rotationally driven by a drive device 18.The side grinder 13 and the upper surface grinder 17 are not limited to the above-mentioned arrangement. It is also possible to reverse the front and rear positions.

Next, to explain the operation of the present invention, the width end portion of the long thick steel plate 22 being conveyed on the conveying roller l of the roller conveyor 10 is first moved from the upstream preheating section 1 to the side surface of the width end portion. By combustion of the fuel gas such as propane gas ejected from the steel plate 22, the thick steel plate 22 is heated to a temperature of ignition/111 W degrees or higher at the starting point of fusing. The thick steel plate 22 whose width end portions have been preheated in the manner shown in FIG.

The fusing residue +A'22A generated when the width end of the thick steel plate 22 is cut diagonally downward by groove fusing 1 to -8 is as follows:
Oxygen gas is intermittently injected from the residual material cutting torch 9 at certain intervals due to the operation of a timer, and the remaining material is cut into a certain length. The cut remaining parts 22Δ fall into a residual material box (not shown) below and are collected.

The remaining material cutting torch 9 is placed at a position such that the remaining material 22A is ignited by the injection of oxygen gas.
It needs to be located close to.

The thick steel plate 22 whose width end portion is cut obliquely is connected to the drive device 14.
The side surface of the width end of the black scale is ground by a side grinder 13, which is rotated by the machine, and the top surface of the width end of the black scale is ground by a two-sided grinder 17, which is subsequently rotated by a drive device 18.

After the width edges are fused diagonally downward in this way, the sides and top surfaces of the width edges are polished to remove any black spots.The long steel plates are then processed into the next welding process to manufacture square columns. transported to.

<Effects of the Invention> As explained above, according to the present invention, the work of fusing the width end portion of a long thick steel plate conveyed by a roller conveyor to form a groove, and the work of cutting the width end portion of a long thick steel plate conveyed by a roller conveyor, Automation of cutting work can be achieved.

Additionally, black scales on the side surfaces and top surfaces of the width edges of thick steel plates can be automatically polished and removed using a grinder placed on the same conveyor delivery line, greatly improving work efficiency. .

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a groove fusing device for welding long thick steel plates according to an embodiment of the present invention, Fig. 2 is a front view showing the assembly status of a general square column, and Fig. 3 is Fig. 2 FIG. 1... (general feed roller, 2... bearing, 3... conveyor frame, 4... support bracket), 5... main frame 11. 6... burner bracket I..., 7 ...Preheating 1-ch, 8...Group fusing torch, 9...Remaining material cutting torch, 10...Roller conveyor, 11...Holder, 12...Support frame, 13... - Side grinder, 14... Drive device, 15... Support stand, 16... Support frame, 17... Top grinder, 1st... Drive device, 19... Piping, 20... Square steel, 21... Long thick steel material, 22... Long thick steel plate whose width end is fused, 23... Welding groove. Patent applicant Shikoku Iron Works Co., Ltd.

Claims (1)

[Scope of Claims] 1. On the path of a roller conveyor that conveys a long thick steel plate, the width ends of the thick steel plate are arranged from the upstream side opposite to the width ends of the thick steel plate conveyed by the roller conveyor. a preheating torch that preheats the preheated width end of the thick steel plate; a groove fusing torch that cuts the preheated width end of the thick steel plate diagonally downward; and a groove cutting torch that cuts the fusing remaining material generated by the diagonal downward fusing of the thick steel plate to a certain length. A groove fusing device for welding long thick steel plates, characterized in that a residual material cutting torch and a remaining material cutting torch are sequentially arranged adjacent to each other. 2. A side grinder that is located downstream of a residual material cutting torch on the path of a roller conveyor that conveys a long thick steel plate and grinds the side surface of the width end of the thick steel plate; and a top surface of the width end of the thick steel plate. 2. The groove fusing device for welding a long thick steel plate according to claim 1, further comprising an upper surface grinder for grinding.