JPS6374514A - Butt welding machine - Google Patents

Abstract

PURPOSE:To make re-clamping for making a feed margin up to a cut line a specified amount according to a sheet metal thickness unnecessary at the time of welding by selectively using multiple pairs of shear heads having different shear edge thicknesses corresponding to different sheet metal thicknesses. CONSTITUTION:Shear heads 6 and 7 of a double rotary shear device 5 on an outgoing side are respectively arranged on the front and rear parts of a ship bottom-shaped frame 10 supported to be movable in a seesaw manner on a movable table 8 moving back and forth from a line side between an electrode clamp device 2 on an incoming side and an electrode clamp device 5 on an outgoing side. A double rotary shear device on the incoming side is formed also in a similar manner. When for instance a thin sheet of a coiled sheet thickness of 1.0t to 2.3t is cut, the shear head 6 is used. And when a thick sheet of 2.3t to 4.5t is cut, the shear head 6 is lowered by means of an elevator cylinder 9, the shear head 7 is raised and a feed margin is set according to the sheet thickness so that a cycle time is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for butt welding the rear end of a leading plate and the tip of a trailing plate in a continuous pickling line, etc., and in particular, the dimensional accuracy of the butt end before welding. The present invention relates to a butt welding machine with a built-in rotary shear device that cuts the butt ends of the leading and trailing coils at right angles in order to ensure the precision of butting the leading and trailing coils.

(Prior Art) FIG. 1 shows a schematic side view of a flash welding machine with a built-in double rotary shear.

In the conventional welding machine 1 of this type, in order to ensure butting accuracy, the rear end of the leading coil and the tip of the trailing coil are clamped by the entry side clamp device 2 and the exit side clamp device 3, and then the entry side The ends of both coils were cut by the double rotary shear device 4 and the outlet double rotary shear device 5, respectively.

To cut a board, a special shear knife has been used on both the entry and exit sides, which has shear rigidity, that is, shear blade thickness, that corresponds to the desired thickness of the board.

For example, in a welding machine for coils with a thickness of 1.0 to 4.5 tons, the sharp blade needs to have the rigidity necessary to cut a sheet with a thickness of 4.5 tons.

Particularly in the case of a flash welder, the dimension from the tip of the electrode clamp to the cut part of the welded material, that is, the extension margin, cannot be made smaller than the thickness of the sharp blade. The dimensions will be the same whether it is 4.5 or 4.5, and if the plate thickness is different, it is necessary to correctly adjust the extension to the determined dimension each time.

Incidentally, in the case of flash welding, the allowance from the tip of the electrode clamp to the end surface of the welding part is approximately 6 mm for plate thickness 1 and OL.
11II11. In addition, for a plate thickness of 4 or 5 tons, approximately 20ml1
l is known as a typical example depending on plate thickness conditions.

(Problems to be Solved by the Invention) However, in the conventional device of this type, as shown in FIG. 2, since the shear blade thickness is constant, the rotary shear cutting line is When setting the extension dimension to be shorter than the shear blade thickness, cut each drawing board with the double rotary shear device 4.5, then release the electrode clamp device based on the cutting line, and then cut the electrode clamp device again. It is necessary to move it forward a predetermined amount and re-clamp it.

As a result, cycle time is lost, or if the plate becomes larger, or if the plate surface is in poor condition, the butt may become inaccurate due to slippage when regripping, which will have a negative impact on welding results. There was a problem.

(Means for Solving the Problems) Therefore, the present invention solves the above-mentioned drawbacks, and the rear end of the leading plate and the tip of the trailing plate are connected by an entry side clamp device and an exit side clamp device. Each clamp is held, and the end of the plate held by the clamp is cut by the upper shear blade and the lower shear blade of the shear device by entering a rotary shear device between the inlet and outlet clamp devices prior to welding, In a device for butt welding the cut ends of both plates, the shear device is equipped with multiple pairs of shear heads with shear blade thicknesses corresponding to different plate thicknesses, and the shear heads are used differently depending on the plate thickness. , taking technical measures.

(Function) For example, when flash welding a leading plate and a trailing plate in a pickling process, when flash welding the end of the leading board and the rear, the end of the leading board and the tip of the trailing board are connected to the entry side. After the clamp is held by the clamp device and the outlet clamp device, the inlet rotary shear device and the outlet rotary shear device are advanced from the direction perpendicular to the line to the inside of the inlet and outlet clamp devices, and the two round blades are Assuming that the edge of the drawing board is cut with a double rotary shear having a is a thin plate, and 2 or 3
It is assumed that the plate thickness conditions are divided into thick plates with those having a thickness of 4.5 to 4.5 as thick plates.

In this case, cutting the thin plate requires mechanical strength of the shearing plate, that is, shearing blade thickness, having a cutting capacity of less than 2.3.

Therefore, in the present invention, T of 1.0t to less than 2.3
When cutting l tl, a shear head 6 having a shear blade thickness corresponding to the thickness condition of the thin plate is used. On the other hand, when cutting a thick plate with a diameter of less than 2.3' to 4.5, the shear head 6 for thin plates is lowered by the lifting device, and the shear head 7 for thick plates is raised to cut the thick plate. I can comply.

In this way, multiple pairs of shear rads can be used depending on the board thickness, so it is possible to set the extension margin according to the board thickness without having to change the grip of the electrode clamp, etc.
It shortens cycle time, eliminates dimensional deviations caused by regripping, and contributes to stabilizing the quality of welded parts.

(Example) Embodiment J of the present invention will be described below based on the drawings.

In addition, FIG. 3 is a perspective view showing an embodiment of the exit side double rotary shear device, and FIG. 4 is a front view of the shear head during cutting when setting the electrode exit margin with the shear head for cutting a thin plate. FIG. 5 is a front view of the shear head when setting the electrode output margin using the shear head for cutting a thick plate.

The gj thick plate cutting shear head 6 and the thick plate cutting shear head 7 provided on the output side double rotary shear device 5 include:
Literally, Sharplade 6a for thin plate condition and thick plate condition.
, 6b and 7a, 7b, respectively.

The two shear heads 6.7 are supported on a movable platform 8 that moves forward and backward between the inlet and outlet electrode clamp devices 2.3 from the line side so as to be movable as a seesaw set. cylinders 9 installed at the front and rear parts of the frame 10 and connected to one side of the frame;
By alternately raising and lowering the front and rear parts of the frame, shear heads suitable for different plate thickness conditions can be raised to the shear line and ready for cutting work.

Although the structure and function of the exit double rotary shear device have been described in this embodiment, it goes without saying that the input double rotary shear device also has the same structure and function.

(Effects of the Invention) As explained above, according to the present invention, in a continuous pickling line, etc., in order to ensure the butting accuracy between the leading plate and the trailing plate, double rotary shearing accuracy is ensured. When cutting the ends of both leading and trailing plates prior to welding using a double rotary shear device, multiple pairs of shear blades for thin plate cutting and thick plate cutting with shear blade thicknesses corresponding to different plate thicknesses are used. By equipping the shear head with a shear head, it is possible to use different shear blades depending on the plate thickness conditions, so compared to conventional shearing devices that can only handle limited plate thickness conditions, it is easier to change grips with the electrode clamp device. , Equipment such as auxiliary clamps for this purpose is no longer necessary, and there is no deviation in the extension dimension due to changing the grip, and butt welding can be performed with high precision. Therefore, the butt end can be positioned accurately and in a short time.
It is possible to further improve production efficiency.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a conventional flash welding machine with a built-in double rotary shear. FIG. 2 is an explanatory diagram for setting the margin of extension from the tip of the electrode clamp by shear cutting. FIG. 3 is a perspective view of a double rotary shear device built into a butt welding machine according to the present invention. FIG. 4 is a front view of the shear when setting the shear head for cutting a thin plate. Figure 5 shows the front of the shear head when setting the shear head for cutting thick plates. [Explanation of symbols] Sl-m - Leading plate S2-m - Trailing plate l-111 Butt melt cutting machine 2-1 - - Person side clamping device 3 - - m - Output side clamping device 4 - -11 Person side double rotary shear device 5-111 Output side double rotary shear device 6 ---- Shear head for cutting thin plates 7 ---- Shear head for cutting thick plates 1st time Fig. 2

Claims (1)

[Claims] The terminal end of the leading plate and the tip of the trailing plate are clamped and held by the entry side clamp device and the exit side clamp device, respectively, and the clamped plate end is held between the entry side and exit side clamp devices prior to welding. In this device, a double rotary shear device is advanced to cut with an upper shear blade and a lower shear blade, and the cut edges of the drawing board are butt welded. This butt welding machine is equipped with multiple pairs of shear heads and is configured to use different shear heads according to the thickness of the plate.