JPH0438482B2 - - Google Patents

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 for joining rough rolled materials and continuously performing finish rolling.

(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, the trailing end of the preceding rolled material and the leading end of the following rolling material are joined by welding or the like between a rough rolling mill and a finishing rolling mill, and finishing rolling is performed continuously. It is something to do.

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 by a winder 2. The coil 3 of roughly rolled material is
It is transferred from the winder 2 onto a cradle 4, from which it is rewound and sent to a splicer 5. In the welding machine 5, the rear end of the preceding rolled material 6a and the trailing rolled material 6b are
The end portions of the rolls are joined together, and the rolls are continuously sent to a finishing mill 8 through a looper 7.

In conventional joining methods, the ends of the leading and trailing rolled materials are cut separately and then the ends are joined together. This method is time-consuming and difficult to join the ends smoothly. Therefore, in order to improve this method, a method was developed in which the joined ends are overlapped and cut.

The joining method involves overlapping the rear end of the leading rolled material and the leading end of the trailing rolled material, forming a jigsaw shape (hereinafter referred to as "jigno 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, the third
As shown in the figure, burrs occur at the cutting tips in opposite directions. Therefore, after cutting, when the leading and trailing ends of both rolled materials are overlapped complementary to each other and fitted together while being pressed, the existence of opposing burrs prevents smooth fitting, resulting in improved rolling efficiency. I couldn't do it.

Furthermore, Japanese Patent Application No. 59-225487 (Japanese Unexamined Patent Publication No. 1988-61) filed by the present applicant discloses a method in which cutting and fitting are simultaneously performed by overlapping the leading and trailing ends of rolled materials. This method does not cause burrs on the cut ends, so the ends can be fitted together smoothly.

However, this method has problems with eliminating end crops and does not allow for adjustment of mixing interference.

Furthermore, in Japanese Patent Application No. 59-260543 (Japanese Unexamined Patent Publication No. 1988-61) filed by the present applicant, the leading and trailing ends of a rolled material are cut separately at the same timing, and the two cut parts are immediately connected to each other after cutting. A method of complementary fitting and completing the bonding is disclosed.

This method is significantly improved in handling burrs and eliminating edge crops. but,
After the end of the rolled material is cut, scale instantly appears on the cut surface, causing problems in later joining of the ends.

Although it is necessary to create an oxidation-free atmosphere from cutting to joining of rolled materials, this is not effective in terms of workability, maintenance, and effectiveness.

(c) Problems to be Solved by the Invention The problems to be solved by the present invention are to prevent burrs from forming oppositely at the front and rear ends of a rolled material during cutting, and to facilitate the elimination of end crops. Joining of rolled materials that is reliable, allows the fitting interference to be selected arbitrarily, does not generate scale on the cut surface from the time of cutting to the time of completion of joining, and performs complementary fitting after cutting without any problems, reliably and quickly. It's about finding a way.

(d) Means for Solving the Problems The method for joining rolled materials of the present invention involves joining the trailing end of the preceding rolled material after rough rolling and the leading end of the trailing rolling material after rough rolling. In a continuous hot rolling line that performs finish rolling, rolling material guiding passages that move individually upward and downward with respect to the line are provided, and each passage has an upper and lower side comprising a pair of upper and lower blades. A cutter unit is provided, the upper blade and the lower blade are formed into a jigsaw shape in which the opening width at the end is narrower than the inner width and complement each other; A plurality of pores are formed in the end face of the blade and an inert gas is injected from the pores, and the tip and rear ends are respectively connected to the pair of upper and lower blade units. Cutting is performed at the same timing, and simultaneously with the cutting, the leading and trailing ends of the cutting are moved in the direction of engagement with each other, and the upper and lower cutter units are moved while moving the respective passages so as to match the lines. The above-mentioned problem is solved by means of fitting the cut ends so as to complement each other and welding the side edges of the fitting parts.

(E) Example In the method of the present invention, in the welding machine 5 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. 3 and 4. FIG. 3 is a plan view of the cutter, and FIG. 4 is a side view of the cutter. As shown in FIG. 3, the cutter 50 is made up of an upper blade 51 and a lower blade 52 that fit into each other and have a jigsaw shape. 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.

In the method of the present invention, as shown in FIGS. 5 and 6, either the upper blade 51 or the lower blade 52, or both the upper blade 51 and the lower blade 52, end face 520 (sixth
In the figure, the case of the end face 520 of the lower blade 52 is shown. ), a plurality of pores 521 are opened in the pores 521, and inert gas is supplied to these pores 521 from an inert gas supply source (not shown) to inject the inert gas to the outside.

Basically, the inert gas may be injected from the blade surface that is in contact with the end surface of the rolled material (not the crop).

The upper blade 51 and lower blade 5 configured in this way
2 in the above-mentioned patent application No. 59-260543 filed by the present applicant.
Applies to the methods disclosed in this issue. FIG. 1 is a schematic illustration of an apparatus for carrying out the method.

In FIG. 1, a normal conveying line 9 for rolled material is shown.
, a lower cutter unit 50a and an upper cutter unit 50 are provided below and above, respectively.
b is provided. In the following description, the subscript a is given to equipment related to the preceding rolled material, and the subscript b is given to equipment related to the subsequent rolled material. Furthermore, upper and lower cutter units 50b and 5
Regarding 0a, it is assumed that the same numbers have the same functions. The lower blade unit 50a has an upper blade 51
a, lower blade 52a, upper blade stand 512a, lower blade stand 522
a. It is made up of a lower blade stopper 53a. Similarly, the upper cutter unit 50b is made up of an upper cutter 51b, a lower cutter 52b, an upper cutter rest 512b, a lower cutter rest 522b, and a lower cutter rest stopper 53b.

Upper and lower cutter units 50b and 50
a is aligned with the cutting line 500. cutting line 500
extends perpendicularly to the conveyor line 9.

A trailing rolled material guiding passage 9 for guiding trailing rolled material 6b is provided on the upstream side of the conveyance line 9 with respect to the cutting line 500.
0b, and a pre-rolled material guiding passage 90a for guiding the pre-rolled material 6a is provided on the downstream side.

The trailing rolled material guiding passage 90b includes a table roller 54a, a guide plate 55b, an upper limit roller 57,
It is made up of an upper limit guide plate 58 and a swing guide plate 59. Among the rollers 54b and guide plates 55b, a plurality of pairs (three pairs in this embodiment) near the cutting line are configured to be able to move upward in conjunction with each other.

The pre-rolled material guiding path 90a is made up of a table roller 54a and a guide plate 55a.
(group) are configured so that they can move downward in conjunction with each other.

In the present embodiment, the passage 90a is described as moving downward and the passage 90b is moved upward, but it will become clear from the following description that the reverse is also possible. However, in that case,
Naturally, the front and back positions of the upper blade, lower blade, etc. also need to be switched.

First, the general steps of the joining method of the present invention will be explained with reference to FIGS. 7 to 13.

As shown in FIG. 8, the passages 90a and 90b are horizontally located in a straight line, and the pre-rolled material 6a has passed through the units 50a and 50b and is passing through the passage 90a. The trailing rolled material is also proceeding.

As shown in FIG. 9, when the rear end of the pre-rolled material 6a passes the detector 56a, the advance of the pre-rolled material 6a is stopped and moved down the passage 90a.
Similarly, when the leading end of the trailing rolled material 6b passes the detector 56b, the advancement of the trailing rolled material 6b is stopped,
Move the passage 90b upward.

As shown in FIG. 10, the pre-rolled material 6a is moved backward and enters the passage 90a, and when its tip reaches the unit 50a, the pre-rolled material 6a is stopped. Similarly, the trailing rolled material 6b is advanced and the passage 9
0b, and when the leading end reaches the unit 50b, the trailing rolled material 6b is stopped. At this time, as shown in FIG. 7A, the lower blades 52a, 52b
Start injecting inert gas from the pores provided in the

As shown in FIG. 11, the rear end portion of the previously rolled material 6a is cut into a jigsaw shape by a unit 50a. Similarly, the tip end of the trailing rolled material 6b is cut into a jigsaw shape by the unit 50b. At this time, as shown in FIG. 7B, the injection of inert gas is continued.

As shown in FIG. 12, the cut ends of the rolled materials 6a and 6b are fitted together. At this time, the unit 50a and passage 90a are raised, and the unit 50b and passage 90b are lowered. Rolled material 6a,
6b is fitted while being lowered, so the rolled material 6
Sagging occurs at a and 6b. This slack is taken up by one table roller 54 in each passage 90a, 90b.
It is supported by a and 54b. At this time, as shown in FIG. 7C, the injection of inert gas is stopped.

Finally, as shown in FIG. 13, after welding the side edges of the fitting portion, the rolled material is advanced and sent to the finishing mill 8. At this time, the table rollers 54a and 54b, which had been partially raised, are returned to the same line as the other table rollers.

In a specific embodiment of the present invention, the diameter of the gas injection hole is 2 mm, the pitch is 50 mm, nitrogen gas or argon gas is used, and the gas injection amount per hole is 1 to 1.
2/min, and the ejection pressure was 2Kg/mm ² .

There are two methods for cutting rolled materials: the down cut method, in which the lower blade is fixed and only the upper blade is moved to punch out the edges of the rolled material, and the other is the down cut method, in which both the upper and lower blades are moved to punch out the edges of the rolled material. There is an up-and-down cut method.

The above explanation has been made using the downcut method as an example, but it can also be applied to the up-and-downcut method.

(F) Effect The first effect is that by cutting the rear end of the preceding rolled material and the leading end of the trailing rolled material separately, opposing burrs can be prevented, and the leading and trailing ends that are cut subsequent to the cutting can be cut. Even in complementary fitting, fitting can be carried out extremely smoothly without being hindered by burrs. Since the rear end portions of the cutting tips are moved toward each other in the fitting direction at the same time as cutting, the time required from cutting to fitting can be extremely short. 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.

The second effect is that the clearance between each pair of blades in the upper cutter unit and lower cutter unit can be selected independently and arbitrarily, so the fitting interference at the cut end of the rolled material can be freely selected, resulting in a stronger joint. is obtained.

The third effect is that the blades on standby are outside the line with their back faces facing the hot rolled material, so damage to the blades due to heat is drastically reduced.

The fourth effect is that since no scale is generated on the cut surface of the rolled material, the connection and fitting are performed reliably, the crimp strength is improved by 50%, and the welding strength of the connection part is improved by 70 to 80%.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of an apparatus for carrying out the method of the present invention. FIG. 2 is a schematic explanatory diagram of a continuous hot rolling line to which the method of the present invention is applied. FIG. 3 is a plan view of a pair of cutters used in the method of the present invention. FIG. 4 is a front view seen from the - line in FIG. 3. FIG. 5 is a perspective view showing the fitted state of the upper blade and the lower blade according to the method of the present invention.
FIG. 6 is a front view showing the end of the knife. FIG. 7 is a schematic explanatory diagram of the cutting and fitting process of the present invention. Figure 8 to 1
The figures up to 3 are process explanatory diagrams of the method of the present invention. 1: Rough rolling mill, 2: Winding machine, 3: Coil, 4:
Cradle, 5: Joiner, 6a: Pre-rolled material, 6
b: Trailing rolling material, 7: Looper, 8: Finishing rolling machine,
50: cutlery, 50a: lower cutter unit, 50
b: Upper cutter unit, 51a, 51b: Upper blade,
52a, 52b: Lower blade 512a, 512b: Upper blade stand, 522a, 522b: Lower blade stand, 521: Pore, 53a, 53b: Lower blade stand stopper, 520:
End face, 56a, 56b: Detector, 54a, 54
b: table roller, 55a, 55b: guide plate, 9: conveyance line, 500: cutting line, 90a:
Leading rolled material guiding passage, 90b: Following rolling material guiding passage.

Claims (1)

[Claims] 1. In a continuous hot rolling line in which finish rolling is performed continuously by joining the rear end of the preceding rolled material after rough rolling and the tip of the trailing rolled material after rough rolling, the upper and lower sides with respect to the line A path for guiding rolled material that moves separately is provided in each path, an upper and a lower cutter unit consisting of a pair of upper and lower blades is provided in each path, and the upper and lower blades are arranged so that the width of the opening at the end thereof is The shape is formed into a jigsaw shape that is narrower than the width of the inner depth, and is formed so as to complement each other, and a plurality of pores are formed in the end surface of the upper blade or the lower blade, and an inert gas is discharged from the pores. cutting the leading end portion and the trailing end portion at the same timing by each pair of the upper cutter unit and the lower cutter unit; and fitting the cutting leading end portions into each other at the same time as the cutting. fitting the cut ends by the upper and lower cutter units so as to complement each other while moving the cut ends in a direction and moving the passages so as to match the lines; A method of joining rolled materials consisting of welding the side edges.