Rolling material joint device and continuous hot-rolling equipment with said device

Abstract

A continuous hot rolling apparatus comprises: a sizing press for forcing down a rolled plate in the width direction supplied from a heating furnace to press the rolled plate to have a prescribed width, roughing mills for rolling said pressed rolled plate, a winding / unwinding machine for winding and unwinding the rolled plate rolled by said roughing mills, a crop shear for shearing the leading end and the tailing end of the rolled plate that has been unwound, an running joining machine that can travel at the conveying speed of the unwound rolled plate for joining the tailing end of the preceding rolled plate and the leading end of the succeeding rolled plate that have been sheared by said crop shear, a finishing mill for carrying out finish rolling of the joined rolled plates, a winding machine for winding the rolled plate that has been subjected to finish rolling, and a cutting machine positioned on the entrance side of said winding machine for cutting the rolled plate in accordance with the wound quantity.

Description

technical field [0001] The present invention relates to a rolling material joining device for joining the rear end of the preceding rolling material and the front end of the following rolling material of the rolling material running in the hot rolling equipment, and a continuous hot rolling equipment equipped with the device . Background technique [0002] In conventional hot rolling facilities (hot flat rolling mills), profiles rolled by a roughing mill are supplied to other finishing mills to obtain a strip having a desired thickness. However, in this equipment, it is impossible to roll all the rolled material uniformly, and the front end and the rear end of the rolled material are prone to defects. As a result, the raw material utilization rate of the rolled material is reduced, and the belt There was a problem that it was difficult to increase the rolling speed due to the engagement / discontinuity of the front end portion and the rear end portion. [0003] In order to s...

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned conventional rolled material joining device, there are following problems: 1. it is difficult to automate (mechanize), and the joint cannot be rolled evenly; It is easy to cause the overall length of the equipment to become longer; ③It is difficult to ensure the joint strength along the entire width of the rolled material, etc.

When the center line of the preceding rolling material and the center line of the following rolling material are misaligned, there will be a problem that a major failure will occur in the subsequent finishing rolling, etc.

[0011] (2), the conical cutter 13 of the rolled material joining device shown in Fig. 2 will be exposed to high-temperature surrounding atmosphere by the reducing and holding device, ② driven by the driving device to rotate at a high speed, and ③ rolled by the lateral moving device Lateral movement in the width direction of the material, ④ factors such as the heat capacity of the blade, which is a conical cutter, decreases during use, etc., which greatly shorten the life

This not only lengthens the cutting time, but also lengthens the joining time, and the traveling distance of the joining device becomes longer, resulting in a longer rolling line.

Furthermore, in order to prevent oxidation of the cutting surface during cutting, the cutting surface is covered with a reducing flame to make it a high temperature, but this makes it impossible to use lubricants during cutting.

As a result, the blade is severely worn and its life is shortened, requiring frequent tool replacement

Also, when the tool is damaged during cutting, it takes time to replace the tool, so the joining operation and rolling operation have to be stopped during this period

The joining is carried out at a certain interval. However, when the tool moves to the next joining position with a large heat capacity, most of the blades cannot be cooled. In this way, the blades during the cutting process are in a high temperature state.

shortened lifespan

[0013] (4), in image 3 In the hot rolling equipment shown, the rolling line becomes longer because the rolled material cannot be coiled after rough rolling

When such edge damage 1b occurs, the thickness accuracy of the edge of the plate cannot be ensured, and trimming is required, resulting in a decrease in the utilization rate of raw materials

But when image 3 There is no correcting device for correcting the defect in the thickness of the end of the plate caused by this kind of joining and rolling in the equipment

In addition, since cutting is not performed before crimping, it is necessary to cut the rolled material according to the amount of rolled material of the portion that can be crimped by the coiler each time, and there is no ability to continuously work with the splicing machine.

Furthermore, Japanese Patent Laying-Open No. 7-24503 discloses a post-forming machine that removes defective parts caused by bonding on the output side of the joining machine. The configuration of this post-forming machine cannot correct edge damage caused by finish rolling.

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