Method for connecting metal plate bands

Abstract

The invention relates to a method for connecting metal strips. Before hot finish rolling, the rear end of the preceding metal strip and the front end of the following metal strip are heated, and the metal strips are pressed against each other. Tightly connect them so that the rear end of the leading metal strip is spaced apart from the front end of the trailing metal strip to face each other, and wear is produced on the mutually opposite end regions of the metal strip. Heating is carried out through the alternating magnetic field in the thickness direction of the metal strip, at least one of the two ends of the metal strip in the width direction of the rear end of the preceding metal strip and the front end of the following metal strip On the part, a conductive member separated from the metal strip by a gap, or a conductive member in contact with the two ends is provided, thereby improving the heating efficiency of the end of the metal strip in the width direction.

Description

technical field [0001] The present invention relates to the continuous hot finish rolling after heating and connecting the ends of the metal strips in front and the ends of the metal strips in the back, which can adopt the connection method of continuous hot rolling metal strips, and directly use This method connects the device. Background technique [0002] In the past, on the hot rolling processing line of metal strips (such as steel, aluminum or copper, etc.), since only one billet was drawn from the heating furnace for rolling at a time, especially in the finishing rolling process, the following problems occurred: kind of defect: [0003] 1) Bad bite at the front end of the metal strip. [0004] 2) Metal strip rear end crease (a phenomenon in which the corners of the thin metal strip rear end are folded). [0005] 3) Scratching of the front end portion of the metal strip when it moves on the output roller table. [0006] 4) The dimensions of the front end and rear en...

AI Technical Summary

Problems solved by technology

[0005] 3) Scratching of the front end of the metal strip when it moves on the output roller table

[0006] 4) The size of the front and rear ends of the metal strip is not accurate

[0014] However, in the heating and connection of metal strips suitable for this induction heating method, the relationship between the inductor and the ends of each metal strip (especially the position of the inductor in the lengthwise direction of the metal strip) When it is inappropriate, not only the number of magnetic force lines passing through the metal strip is insufficient, but also the vertical component of the magnetic force lines becomes less, which is unfavorable

Therefore, in the conventional method disclosed in the aforementioned Japanese Unexamined Patent Publication No. 62-234679, because this point is not taken into account, various satisfactory heating methods cannot be obtained according to the positional relationship between the inductor and the metal strip. Therefore, there are not only long heating time, but also uneven heating between the metal strips walking in front and the metal strips walking behind, making it difficult to achieve a good connection.

[0015] (3) When the metal strip is heated, when the initial temperature of the metal strip running in front and the metal strip running behind is different, or the thickness of the plate is different, or the melting point of the metal strip as the connecting object is different , it cannot be properly heated according to various metal strips, and the metal strips cannot have good connection strength

At this time, there is a risk of a major accident in which the plate is disconnected from the connected part during the rolling process

[0016] (4) Inductive heating is carried out in the state where the distance is drawn between the metal strips walking in front and behind, and then they are connected by pressure, that is, a connection method utilizing so-called non-contact heating has been proposed (Japanese Patent Laid-Open) Show No. 60-244401 bulletin), according to this method, it is necessary to give a uniform magnetic field on the entire width of the metal strip, but, mainly in the manufacture of the power supply part of the inductor, to be able to produce this uniform magnetic field, Its widest limit is 1000mm, greater than this limit, for example, when the width is 1900mm, at least two sets of inductors are required (the power limit of one inductor is 2000-3000KW, to manufacture 4000KW corresponding to the width of 1900mm above the inductor, which is actually very difficult), so that it is difficult to have a uniform magnetic field across the entire width of the metal strip

[0019] In the case of endless rolling of metal strips, the connecting process of metal strips must be synchronized with the rolling process in time, so the connecting device arranged at the entrance of the finishing mill is usually made into a mobile , can move with the metal strip, or set up a mechanism such as a looper with a time buffer function between the connecting device and the rolling equipment. In this way, the production line must be extended inevitably, and a new mechanism must be installed to make the equipment cost increase

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