JPH04157003A - Joining method of rolled stock - Google Patents

Abstract

PURPOSE:To enable rolling without the necessity of complicated operation by cutting the tip and rear end parts so that they are mutually made into a parallel fitting shape and forming the side faces of either parallel fitting part into a tapered shape in the thickness direction at the time of joining the rear end part of a preceding rolled stock and the tip part of the following rolled stock. CONSTITUTION:The rear end part of the preceding rolled stock l after rough rolling and the tip part of the following rolled stock 1a are joined and finish rolling is continuously executed. The above tip and rear end parts are cut so that they are mutually made into the parallel fitting shape and the side faces of the parallel fitting parts 2 in arbitrary places of one or both sides of either the tip or rear end part are formed into a tapered shape. The both are fitted in the same plane and the tip and rear end parts are joined utilizing volume repletion due to ununiform width expansion of sheet when rolling. In this way, rigid joining can be expected by generating large contact pressure between joined surfaces utilizing plastic deformation pressure accompanied to rolling process.

Description

DETAILED DESCRIPTION OF THE INVENTION [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 rolling is performed continuously.

[Conventional technology]

Conventionally, when manufacturing plate-shaped products by sequentially and continuously hot-rolling rolled materials, each rolled material of a predetermined length was intermittently supplied to a rolling mill.

However, such intermittent operation has various problems such as low productivity and poor yield.

Therefore, as a means to solve this problem, various methods have been proposed in which the trailing end of the preceding rolled material and the leading end of the trailing rolled material are joined to make the rolled material continuous and introduced into the rolling mill.

For example, the method shown in Fig. 4 (a), (b), and (C) is such that the ends of the two rough-rolled plates 1 and 1a to be joined are narrower than the opening width at the tip or the width at the inner depth. Jigun shape 2,2
a, and they fit into each other in a complementary manner. According to this method, the unfitted parts of the jigsaw can withstand the tension acting in the direction of movement of the plate material, up to the stress that causes plastic deformation, and a strong joint can be obtained, but the sides of the fitted parts of the jigsaw are integral Therefore, when the plate moves in the vertical direction, for example, when it is wrapped around a looper, it is extremely easy to come off. Furthermore, since the two plates cannot be fitted together in the same plane, it is necessary to guide the succeeding member above (or below) the preceding member and then move one of the plates in the vertical direction. This required complex work such as

In order to solve the second problem, the present inventor made the fitting part into a parallel fitting shape, fitted the first and succeeding parts in the same plane, and made use of the non-uniform width expansion during rolling to achieve parallel fitting. Although a method has been proposed in which the joint is made into a jigsaw shape, this method is still insufficient to solve the first problem.

[Problem to be solved by the invention]

When cutting a plate material, the cut surfaces are perpendicular to the front and back surfaces, so unless the cut surfaces of the leading and trailing materials are integrated, they will be weak against vertical force and the fitting part will easily come off. We propose a method for joining rolled materials that can prevent this.

[Means for Solving the Problems] The method for joining rolled materials according to the present invention involves joining the rear end of the preceding rolled material after rough rolling and the leading end of the trailing rolled material and continuously performing finish rolling. During a continuous hot rolling line, the above-mentioned leading and trailing ends are cut so as to fit in parallel with each other, and a parallel-fitting portion is formed at an arbitrary point on either or both of the leading and trailing ends. The main idea is to form the side surface of the sheet into a tapered shape in the thickness direction, fit the two together in the same plane, and use the volume filling caused by the uneven width expansion of the sheet during rolling to join the leading and trailing scraps. That is.

[Effect]

When normal rolling is performed with the parallel fitting parts of the leading and trailing parts respectively fitted together, the material spreads not only in the rolling direction but also in the width direction at the convex parts at the ends. At this time, since the side surface of the parallel fitting part is formed into a tapered shape, one rolled material is pressed against the other tapered part and flows, so that one side wraps around the other and becomes able to withstand vertical forces. .

〔Example〕

An embodiment of the invention is shown in FIG.

FIG. 1(a) is an example of the trailing end portion (or leading end portion) of the trailing material after rough rolling formed according to the present invention. A tapered surface 3 is formed in the thickness direction. FIG. 1(b) is a plan view of FIG. 1(a) seen from above, and numeral 3 in the figure is a tapered surface. FIG. 1C shows a state in which the trailing material rear end portion (or trailing material leading end portion) 1 and the trailing material leading end portion (or trailing material trailing end portion) la are fitted in parallel with each other. At this time, no tapered portion is provided in the parallel fitting convex portion 2a of the mating material 1a of the trailing end portion 1 of the preceding material. When the fitting part is rolled in the state shown in Fig. 1(C), the tip of the convex part widens greatly in the sheet width direction, becomes fan-shaped, and engages with the adjacent convex part, and then the convex part on the side of the trailing material tip part la. The material widening from 2a also flows onto the tapered part 3 provided on the convex part 2 on the rear end part 1 side of the preceding material, as shown in FIG. 1(d). That is, the convex portions 2 and 2a are entangled with each other in the vertical direction as well, so that they can strongly resist vertical forces.

The tapered portion 3 may be formed on either side of the adjacent convex portions 2 and 23, so instead of providing it entirely on the convex portion 2 side as shown in FIG. It may be placed on both sides. Also.

As shown in FIGS. 3(a) and 3(b), instead of forming a tapered portion over the entire length of the convex portion 2, the protrusion 2 may be formed with a large notch at the base corresponding to the distal end having a particularly large width.

〔Effect of the invention〕

In the present invention, it is only necessary to separately cut and taper-form the front and rear ends of the plate and then fit them together in parallel on the same pass line.
There is no need for complicated operations such as shifting the pass line of the trailing material in the vertical direction and moving the plate material in the vertical direction.

In addition, since it is possible to generate a large contact pressure between the joint surfaces by utilizing the plastic deformation pressure accompanying the rolling process, a strong joint can be expected. moreover.

Due to the effect of the tapered part in the plate thickness direction formed in the fitting part, the parallel fitting part becomes entangled in both the rolling direction and the plate thickness direction during rolling, and the tension acting in the rolling direction and the pressure of the looper acting in the plate thickness direction are reduced. It is possible to stably roll without breaking under both raising forces.

[Brief explanation of drawings]

1(a), (b), (C), and (d) are explanatory diagrams of the rolled material joint according to the first embodiment of the present invention, FIG. 2 is an explanatory diagram of the second embodiment, and FIG. Explanatory diagram of the third embodiment, Fig. 4 (
a), (b), and (C) are explanatory diagrams showing a conventional joining method. DESCRIPTION OF SYMBOLS 1... Leading rolled material, 2... Parallel fitting part, 3... Taper part, la... Following rolling material, 2a... Parallel fitting part.

Claims (1)

[Claims] During a continuous hot rolling line where the trailing end of the preceding rolled material after rough rolling and the leading end of the trailing rolling material are joined together for continuous finish rolling, the leading and trailing ends are parallel to each other. The side surface of the parallel fitting part at any point on either the tip or the rear end or both is formed into a tapered shape in the plate thickness direction, and both are cut in the same plane. A method for joining rolled materials, characterized in that leading and trailing end materials are joined by utilizing volume filling due to non-uniform width expansion of the sheets during rolling.