JPS61103607A - Joining method of rolling stock - Google Patents

Abstract

PURPOSE:To fit smoothly and rapidly the front and rear end-parts to each other by separately blanking the rear and front end-parts, in blanking the rear end-part of a preceding rolling stock and the front end-part of a succeeding one into zigzag shapes and fitting them to each other before joining the side edges of fitting parts together by welding. CONSTITUTION:The rear end of a preceding rolling stock 6a is firstly cut by lowering an upper blade 51, etc., by a down cut method for instance, by using a pair of upper and lower blades 51, 52, having each a zigzag shape wherein the width of an opening at the end part is smaller than that of an inner part to mutually filling up its vacancy. Next, the blade 51, etc. are returned to the original positions, and the front end of a succeeding rolling stock 6b is advanced till it comes into contact with an upward-pusher and stopper 53, to cut the front end of stock 6b by lowering the blade 51 again, and remove a crop 6b' thereafter. Next, the cut parts are fitted to each other in a mutually offsetting state, by lowering an upper fitting bed 511, etc., and both stocks 6a, 6b are joined together by welding the side edges of joining parts. In this way, the cut end-parts are prevented from burrs generating oppositely, and said fitting is surely and rapidly performed without causing any troubles.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a method for joining rough rolled materials in a continuous hot rolling line in which rough rolled materials are joined and finish rolled continuously.

(B) Prior Art In recent years, continuous hot rolling has been proposed in order to improve threadability, reduce scrap loss, and improve work efficiency. In this continuous hot rolling, finish rolling is performed continuously between a rough rolling mill and a finishing mill by joining the trailing end of the preceding rolled material and the leading end of the following rolling material by welding or the like. It is.

A typical conventional continuous hot rolling line to which the method of the present invention is applied will be explained with reference to FIG. The rough rolled material rolled by the rough rolling mill 1 is wound into a coil shape by a winder 2. A coil 3 of rough rolled material is transferred from the winder 2 onto a cradle 4, from which it is unwound and sent to a splicer 5. In the welding machine 5, the rear end of the preceding rolled material 6α and the tip end of the trailing rolled material 6b are joined, and are continuously sent to the finishing mill 8 through a louver 7.

In the conventional joining method, the rear end of the leading rolled material and the leading end of the trailing rolled material are overlapped to form a jigsaw shape (hereinafter referred to as jigsaw shape) in which the opening width at the end is narrower than the width at the inner depth. It was punched out. In this method, as shown in FIG. 6, burrs occur at the cutting tips in opposite directions. Therefore, after cutting, when the leading and trailing ends of both rolled materials are complementarily overlapped and pressed together to fit together, the existence of opposing burrs prevents smooth fitting, which improves rolling efficiency. 0 (c) Problems to be Solved by the Invention The problems to be solved by the invention are to prevent burrs from appearing on the leading edge of the rolled material during cutting, and The purpose of the method for joining rolled materials of the present invention is to provide a method for joining rolled materials that can reliably and quickly perform complementary fitting without any trouble. In a continuous hot rolling line where the trailing end of the rolled material and the leading end of the trailing rolled material after rough rolling are joined and finish rolling is carried out continuously, a pair of zigsy-shaped complementary materials are used. cutting the tip and rear ends separately into 11 parts using an upper blade and a lower blade, and fitting the cut ends in a mutually complementary manner;
The above problem is solved by welding the side edges of the fitting portion.

((e) Example) In the method of the present invention, in the connecting device shown in FIG. and weld the end sides to complete the connection.

An example of a cutter for punching into a jigsaw shape is shown in FIGS. 2 and 3. Figure 2 is a plan view of the cutlery.
The figure is a side view of the knife. As shown in FIG. 2, the cutter 50 has a jigsaw-shaped upper blade 51 and a lower blade 52 that fit into each other.
It is made up of. The upper blade 51 and the lower blade 52 have the same shape, and when one of them becomes the upper blade, the other becomes the lower blade.

The cutting edge of the upper blade 51 or the lower blade 52 is tapered as shown in FIG. This taper is for smooth punching of the rolled material. Next, the joining method of the present invention will be explained with reference to FIGS. 4 and 5. FIG. 4 shows a down cut method in which only the upper blade g+ is lowered from above to the bottom to punch out the rolled material.

Figure 5 shows an up-and-down cut method in which the upper blade 51 and lower blade 52 are raised and lowered to punch out a rolled material. In both drawings, the same reference numerals represent the same members.

As representatively shown in FIGS. 4(A) and 4(B), the upper blade 51, upper blade stand 512, and upper fitting stand 511 are attached to the upper holder (not shown) as an integrated unit using a conventional mechanism. is,
They can be raised and lowered as a whole or individually. Similarly,
The lower blade 52, the lower blade stand 522, the lower fitting stand 5212 and the push-up/stopper 53 are attached to the lower holder (not shown) as an integral unit by a conventional mechanism, and they can be moved up and down as a whole or individually.

First, with reference to FIG. 4, the joining operation using the down cut method will be described. First, the pre-rolled material Samurai Kikou a (B
), the upper blade 51. Upper blade stand 512, upper fitting stand 51
1 is all raised to a predetermined position, and the lower blade 52, lower blade stand 522, lower fitting stand 521, and push-up/stopper 53 are aligned on the same plane, and the rear end of the preceding rolled material 6α is placed on top of them. section is placed in place.

Next, in the preceding rolled material cutting step (C), the upper blade 51
, the upper blade stand 512 and the lower fitting stand 521 descend to cut the rear end. The crop 6α' slides on the lower fitting base 521 and is removed to the outside.

In the trailing rolled material standby step (D), the upper blade 51 and the upper blade stand 512 rise and return to their original positions, and at the same time the push-up/stopper 53 rises to hold the rear end of the preceding rolled material 6α in a predetermined position. Push up to the height of .

In the trailing rolled material stopping step (E), the trailing rolled material 6h is waited for to enter in the state of step (D), and when the trailing rolled material 6b enters, its tip is pushed up and stopped by the stopper 53. 0 In the trailing rolled material cutting process (F), the upper blade 51, the upper blade stand 512, and the lower fitting stand 521 are lowered, similarly to the step (C). The tip of the trailing rolled material 6b is cut. clog s
h / remains on the lower cutter stand 522, and the tip of the trailing rolled material 6b is pushed down by the upper cutter stand 512.

In the crop removal step (G), the upper blade 51 and the upper blade stand 512 return to the height position of the step (E), and the upper fitting stand 511 descends to press the rear end of the preceding material 6α, while , the lower fitting table 521 rises and returns to the state of step (E). The crop s b/ is taken out horizontally.

In the end overlapping step (H), the upper blade 51 and the upper blade stand 5
12. The upper fitting table 511 and the push-up/stopper 53 are lowered to overlap the rear end of the preceding rolled material 6α and the tip of the trailing rolled material 6b.

Finally, in the fitting step (I), the upper fitting table 511 and the push-up/stopper 53 are further lowered to fit both ends. Thereafter, in order to prevent the jigsaw side edges from expanding outward during rolling, the side edges of the joint are welded to complete the joint. Furthermore, if necessary, the jig fitting portion may be spot welded at several locations in the board width direction.

The up-and-down cut joining method shown in FIG. 5 is different from the down cut method shown in FIG. This is substantially the same as the joining method. Therefore, only the differences in each step between the two will be briefly explained below.

In the preceding rolled material cutting step (C), the upper blade 51 and the upper blade stand 512 are lowered, and the lower blade 52, the lower blade stand 522,
The push-up/stopper 53 simultaneously rises and cuts the rear end of the previously rolled material.

In the subsequent rolling material standby step (D), the lower blade 52 and the lower blade stand 522 are lowered.

In the trailing rolled material cutting step (F), the upper blade 51 and the upper blade stand 512 descend, and the lower blade 52 and the lower blade rest 522 simultaneously rise to cut the tip of the trailing rolled material.

In the crop removal process (G), the lower blade stand 522 is lowered together with the lower blade 52, and returns to the state of the process (E). By cutting these separately, as shown in Fig. 7, it is possible to prevent the burrs from opposing each other, and even in the complementary alignment of the leading and trailing ends, as shown in Fig. 8, The fitting can be done very smoothly without any burrs.

Therefore, in online joining where the time required for joining is limited to 10 seconds or less, the method of the present invention, which enables smooth fitting, has a very large effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a continuous hot rolling lie y to which the method of the present invention is applied. FIG. 2 is a plan view of a pair of cutters used in the method of the present invention. Figure 3 is a side view taken from the line ■-■ in Figure 2. FIG. 4 is an explanatory diagram of the operation of the down cut method based on the method of the present invention. FIG. 5 is an explanatory diagram of the operation of the up-and-down cut method based on the method of the present invention. FIG. 6 is an explanatory diagram showing the occurrence of burrs when the leading and trailing ends are simultaneously cut using the conventional method. Fig. 7 is an explanatory diagram showing the occurrence of burrs when the leading and trailing ends are cut separately using the method of the present invention, and Fig. 8 is an explanatory diagram showing the occurrence of burrs when the leading and trailing ends are cut separately using the method of the present invention. FIG. 7 is an explanatory diagram showing the relationship between the burrs at the ends and the fitting situation. 1; Rolling machine 2: Winding machine 3; Coil 4: Cradle 5; Joining machine
6α: Leading rolled material 6α: Following rolling material 7;
Roots 8: Finishing rolling machine 50; Cutting tool 51; Upper blade 52: Lower blade 5.3: Push-up/stretcher 511: Upper fitting table 512:
Upper blade stand 521: Lower fitting stand 522; Lower blade stand patent applicant Sumitomo Metal Industries, Ltd. (5 others) Figure 4 Figure 5, )t QtZ Odo (I) 5,7

Claims (1)

[Claims] In a continuous hot rolling line where the rear end of the preceding rolled material after rough rolling and the tip of the trailing rolled material after rough rolling are joined and finish rolling is performed continuously, the opening width at the end is It has a jigsaw shape that is narrower than the width of the part and complements each other 1
Separately cutting the tip and rear ends with a pair of upper and lower blades, fitting the cut ends in a mutually complementary manner, and welding the side edges of the fitting part. A method for joining rolled materials made of