JPS6117378A - Flash welding machine - Google Patents

Abstract

PURPOSE:To obtain a titled welding machine that prevents welding defect of welded coils by detecting thickness of rear end of a preceding coil and front end of a succeeding coil, and after matching the center of respective plate thickness and flash welding, cutting off welding burrs. CONSTITUTION:In hot rolling of iron and steel, rear end of a preceding coil 1 is clamped and fixed by electrodes 3, 5, and front end of succeeding coil 2 is clamped by electrodes 4, 6 that can move vertically and back and forth clamping the end of coil 2. Then plate thickness T1, T2 of rear end and front end 1, 2 of the coils is detected by thickness detectors 10, 11 such as a ultrasonic thickness gauge or a laser detector etc. Then, holding devices of electrodes 4, 6 are moved vertically, and the front end 2 is positioned to make the height difference A of the rear end 1 and front end 2 A=(T1.T2)/2, and flash welding is made after matching the center of plate thickness of the two. Burrs on the butt face 9 perpendicular to the center of thickness thus formed are removed by cutting using cutting tools 7, 8, and the weld zone is confirmed by the thickness detector 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to the prevention of welding defects due to misalignment of butt centers of coils to be welded in a flash welding machine of a steel rolling line.

[Prior art]

In the hot steel line, hot slabs are rolled into coils one by one in a rolling mill, or the rolled coils must be welded to obtain a long coil. Butt flash welding is used for this welding, but generally, the tension between the rolling stands becomes zero during rolling at the tip and tail ends of the coil to be melted.
Since the temperature is lower than other parts, the finished board thickness Fi
The thickness of the cocoil plate is said to be quite different from the nominal value.

However, since the exact plate thickness of the tip and tail ends of the coil is unknown, conventional welding has been carried out using the nominal value of the coil plate thickness9. 11
The figure is an explanatory diagram of the operation of a conventional device, Fig. 10 is a diagram of the relationship between the tail end and the tip of the coil before welding, and Fig. 11 is an explanatory diagram of the work of cutting and removing welding burrs after welding. . In Fig. 10, (1) is the tail end of the preceding coil (151), (2)
is the tip of the trailing coil α barrel, (3), (51 is the tail end (
The electrodes (4) and (6) are for fixing the tip (2).
) are fixed electrodes. As shown in the figure, the tail end (1) and tip end (2) of both coils have the same nominal thickness, but
In reality, the tail end (1) is thicker than the tip (2). Now in this state, electrode (3).

(5) and (4J, (6)) and move the electrode (4) 9 (61 towards the electrode (3), (5) to the end (1) of both coils.

(2) If a flash is generated between the tail end (1) and the tip (2), the flash is less likely to occur in the thicker part of the tail end (1) than the lower part of the tail end (1). Metal wear due to flashing is reduced, and the welded butting surfaces eventually tilt as shown in (9) in Figure 11, and when pressure is applied during the absetting process, bending force acts on the welded part, causing the eye to bend. The difference is welding. In this situation again,
When proceeding to the next weld burr removal process, the cutting tool (7)
, (8) is set on the same plane as the electrode (31, (5)), so after the welding burrs are scraped off, as shown in Fig. In addition, since the abutment surface (9) is inclined, the bottom edge of the plate side is bent downward during the absetting process, and the part below the clamping surface of the electrode becomes a welding burr. As the material is removed during cutting, the thickness of the thinner plate becomes even thinner.If this phenomenon occurs, there is a risk that the welded part will break during subsequent processes such as rolling or bending, so measures are taken to prevent this. In the past, the welded area was visually observed after the welding burrs were removed, and if a sagging phenomenon was discovered, the work of welding and welding burrs removal was repeated.

[Summary of the invention]

This invention was developed in order to eliminate such drawbacks of the conventional method.In flash welding of coils, the thickness of the tail end and tip end of two coils, which are the welded parts, is measured and the thickness is measured. To provide a flash welding machine that prevents misalignment during welding by setting and welding two coils so that the centers of the plate thicknesses of the welded parts of two coils are aligned according to the information.

[Embodiments of the invention]

Figures 1 and 2 show examples of the present invention. Figure 1 shows the process of aligning the center of the plate thickness between the tail end and tip of both coils during welding, and Figure 2 shows the process of welding. FIG. In the figure, (1) to (9) are exactly the same as the conventional device described above, and aO) and ([υ plate thickness detector,
For example, ultrasonic plate thickness detection devices. Biting electrode (4+
, (61 holding device (not shown) is plate thickness detector Q!1
) I (According to the information in 111, the tip of the coil (2
) is configured so that it can be moved up and down while being clamped.

Next, the operation will be explained. First, during welding, the plate thickness detector (IOl e (IIJ) is used to measure the plate thickness T1.T of the tail end (1) and tip end (2) of the coil, and this T,
, according to the information of T2, move the holding devices of the electrodes (4) and (6) up and down while clamping the tip (2), and center the tail end (1) and the tip (2) on the plate. Combine. That is, as shown in FIG. Next, welding is performed, and the temporary welding burrs are cut and removed. Figure 2 shows the cutting tool (7)t(8
The situation of cutting and removing the melted beam by + is being determined. As mentioned above, during welding, the tail end (1) and tip end (2) of the coil are aligned with the center of the plate thickness, so the welded part wears out symmetrically around the center of the plate thickness during welding, and therefore As shown in FIG. 2, the welding butt surface (9) is perpendicular to the center of the plate thickness, and even if pressure is applied to the welding butt surface during upsetting, no bending force is generated in the weld.

Also, when cutting and removing welding burrs, the cutting tool ('/
), (The cutting edge of the al is set so that it can brush against the surface of the thin plate according to the information on the plate thickness T, , T, of the end of the coil (1, 1, (2)) measured earlier. Moreover, since the shape of the cutting edge is formed into an arc shape with a small curvature, the welded part after cutting and removing the blade will be at both ends of the coil (1) and (2).
) Even though there is a difference in plate thickness, the change in plate thickness is gradual. Furthermore, after welding burrs are removed, the welded part is passed through the plate thickness and the top surface of the detector to measure all changes in plate thickness, making it possible to confirm that there are no mismatches or differences in height.

6 to 9 are explanatory views of the overall operation of the welding line of the present invention. α2 is a flash welding machine with electrodes (31, (4
), (5), (6), etc., a device for applying voltage,
Electrode (3)2. (5) and (4), (6) holding device, electrode (4), (6) to electrode (3), (5)
) and a cutting tool to remove weld burrs. Flash m J'
2: NO,1 and NO62 pinch rolls α for sending coils to the inlet and outlet sides of l'A Q2,
(13) is installed, NO, 1 pinch roll (1'
A payoff reel I is installed in front of D to attach the coil and send it out. The plate thickness detector 00 is installed on the inlet side of the flash welding machine α, but it is also possible to install two units, one for measuring the tail end and one for measuring the tip, as shown in Figure 1. Further, it may be provided only in the flash welding machine (121). α0 is a coil cutting device.

Figure 6 shows the coil (IS) being fed out on the pay-on reel 04. Figure 4 shows the coil (IS) passing through the pay-on reel 04 and being attached to the cutting machine αe.
The preceding coil 0ω whose tail end was cut by the cutting device aυ is
As shown in FIG.
(7) IE The tail end (i) is clamped to the poles (3) and (5). In FIG. 5, it is further fed out from the trailing coil (181 is the payoff reel 04), and after the tip is cut off by the cutting device tm, No. The figure shows the situation where one pinch roll aη is sent to the flash welding machine (12+). When passing the upper surface of the thickness detector 00), the plate thickness Tl5T2 is measured. Figure 6 shows the tip (2) of the trailing coil 08)
2, and clamped the electrodes (41, (61). Button 7 shows the center of the plate thickness of the ends (1) and (2) of both coils as explained in Fig. 1. After matching the flash, the ax is moving around.
Ru. Figure 8 shows the cutting tool (7).

(8) indicates the work of cutting and removing the welding beam. Figure 9 shows electrodes (3), <5) and (4).

(6), move the welded part of the welded coil to the top surface of the plate thickness detector α0), measure the change in plate thickness at the welded part, and confirm that there is no misplaced welding. It shows where you are. If a misalignment is found in the welded portion, the welded portion is cut and removed using the zeta cutting device ae, and then the plate thickness is measured, flash welded, the melt bulge is removed, and the misalignment is detected.

The same effect can be obtained by using a laser measuring element that can measure the distance from the reference surface to the welding part surface in place of the plate thickness detector GO), (lυ).

〔Effect of the invention〕

As described above, by installing the plate thickness detector, the plate thickness of the end of the coil to be welded can be accurately measured.
Since it is possible to butt and flash weld the two coils at the center of the plate thickness according to the plate thickness information, the misaligned welding that occurred frequently in the past can be prevented, and the mechanical strength and reliability of the welded part can be improved. You can get the effect of a significant improvement.

[Brief explanation of the drawing]

Figure 1 shows an embodiment of the present invention, an enlarged view of the main part before welding, and a second
The figure is an enlarged view of the main part showing the cutting and removal of the welding insulator, Figure 6~
Fig. 9 is an explanatory diagram of the general operation of the welding line, Fig. 3 is an explanatory diagram of the feeding status of the preceding coil, Fig. 4 is an explanatory diagram of the tail end of the preceding coil just before cutting, and Fig. 5 is an explanatory diagram of the tail end of the preceding coil. Figure 6 is an explanatory diagram showing the situation before welding when both coils are installed in the welding machine, and Figure 7 is when welding both coils. FIG. 8 is an explanatory diagram showing the weld burr cutting and removal, and FIG. 9 is an explanatory diagram showing the measurement of the plate thickness of the welded part for # verification. FIG. 10 is an enlarged view of the main part of the conventional apparatus before welding, and FIG. 11 is an enlarged view of the main part when removing the conventional welding spigot υ. In the figure, (1) is the tail end of the leading coil, (2) is the tip of the trailing coil, (31, (J, (5), (6) l- are electrodes, (7 n, (8) is cutting) Tools, (9) is the welding butt surface, θ0), αυ is the plate thickness detector, 輯) is the flash welding machine, 0(9), a?) is the pinch roll, (141 is the payoff reel, (+61 is the cutting device) , θ5), and as are coils. The same reference numerals in each case indicate the same or equivalent parts. Agent Patent Attorney Sanro Kimura No. 111 Fig. 2 Fig. 3 Fig. 5f!] Figure 7 Figure 8 Figure 9 TI!J No. 101!! Procedural Sleeve Authorization (Spontaneous) September 28, 1982

Claims (3)

[Claims] (1) In a flash welding machine consisting of an electrode, an electrode holding device that clamps the electrode to a coil, a feeding device that moves the electrode, and a welding burr cutting and removal device, the tail end of the leading coil and the tip of the trailing coil are A plate thickness detector is provided to detect the plate thickness, and one electrode holding device is moved while clamping the coil according to the plate thickness information of the plate thickness detector, and the center of the plate thickness at the end of the two coils is moved. A flash welding machine that performs flash welding after joining. (2) The flash welding machine according to claim 1, wherein an ultrasonic thickness measuring device is used as the plate thickness detector. (3) The flash welding machine according to claim 1, wherein a laser measuring element capable of measuring the distance from the reference surface to the welding part surface is used as the plate thickness detector.