JP2016172274A - Manufacturing method and apparatus for band-like body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method and a device of a belt-like body for performing shape control for preventing warpage in the longitudinal direction of the belt-like body, in production of the belt-like body.SOLUTION: A plurality of spray nozzles for spraying a lubricant to a front surface and a rear surface of a belt-like body just before rolling are provided in the width direction, and a concentration and a flow rate of the lubricant to the spray nozzles are adjusted based on a shape measurement result of the belt-like body by a shape meter provided on the outlet side of a roller.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method and an apparatus for manufacturing a strip for manufacturing a strip having high flatness.

  In the strip rolling process, the flatness of the strip is one of the factors related to the influence on the sheet passing property in the next process line and the quality of the final product. Factors that deteriorate the flatness of the belt-like body include a thickness difference in the width direction, a hardness difference, a load difference, and a roll outer periphery difference. These factors locally change the elongation of the plate and deteriorate the flatness.

  As a technique for such deterioration of flatness, for example, there is a technique disclosed in Patent Document 1.

  In Patent Document 1, a plurality of nozzles / headers for respectively injecting different concentrations of rolling oil are provided, and each nozzle / header is divided into a plurality of rolling oil zones in the width direction of the rolled material, according to the flatness of the rolled material. It is disclosed that the mixing concentration and the mixing injection flow rate of the rolling oil in each zone are adjusted.

JP 59-118211

  However, although the technique disclosed in Patent Document 1 can reduce local elongation, there is a problem in that sufficient shape control cannot be performed for the warpage in the longitudinal direction of the belt-like body (hereinafter also referred to as L warpage). is there.

  The present invention has been made in view of the circumstances as described above, and provides a method and apparatus for manufacturing a strip, which performs shape control for preventing warpage in the longitudinal direction of the strip in the manufacture of the strip. It is intended.

  In order to solve the above problems, the present invention has the following features.

[1] A plurality of injection nozzles for injecting lubricant on the front surface and the back surface of the belt-like body just before rolling are provided in the width direction,
A method for producing a belt-like body, comprising adjusting a concentration and a flow rate of a lubricant to the injection nozzle based on a shape measurement result of the belt-like body by a shape meter provided on the exit side of the rolling mill.

[2] In the method for producing a strip according to [1],
In supplying the lubricant to the injection nozzle,
Use a nozzle mix type piping where the stock solution piping and water piping of the lubricant merge at the junction,
A method for producing a strip-like body, wherein the flow rate is individually controlled by installing a flow rate controller in the middle of the stock solution pipe and the water pipe.

[3] A plurality of injection nozzles for injecting a lubricant provided in the width direction on the front and back surfaces of the belt-like body just before rolling,
A nozzle mix type pipe for supplying a lubricant to the injection nozzle by combining a stock solution pipe and a water pipe of the lubricant at a junction; and
A flow controller provided in each of the stock solution pipe and the water pipe;
A shape meter that measures the shape of the strip on the exit side of the rolling mill,
An apparatus for manufacturing a belt-shaped body, comprising: a control device that determines a target concentration / flow rate of a lubricant based on a shape measurement result of the shape meter and commands the target flow rate to the flow rate controller.

  In the present invention, an injection nozzle for injecting lubricant is provided on the front and back surfaces of the belt-like body immediately before rolling, and the concentration and flow rate of the lubricant to the spray nozzle are adjusted based on the shape measurement result of the belt-like body. Therefore, warpage in the longitudinal direction of the belt-like body can be prevented.

It is a figure which shows the apparatus structural example of this invention. It is a figure which shows the mode of the lubricant injection to the front and back of a strip | belt shaped object. It is a figure which shows the structural example of nozzle mix type piping.

  In the present invention, the concentration / flow rate of the lubricant injected into the belt is adjusted in the width direction and the front and back surfaces by changing the concentration and flow rate in the width direction and the front and back surfaces. Make a difference. In this way, by controlling the lubrication state of the front and back surfaces and the width direction, by negating the influence of the sheet thickness difference in the width direction of the belt-shaped body that gives a difference in the tension and load in the rolling direction and the circumferential difference of the work roll A belt-like body with high flatness can be produced.

  FIG. 1 is a diagram showing an apparatus configuration example of the present invention. Moreover, FIG. 2 is a figure which shows the mode of the lubricant injection to the front and back of a strip | belt shaped object, and is the side view seen from the A direction shown in FIG. Further, FIG. 3 is a diagram illustrating a configuration example of the nozzle mix type piping. In the figure, 1 is a strip, 2 is a rolling mill, 3 is a shape meter, 4 is a control device, 5 is a stock solution, 6 is water, 7 is a junction, 8 is a nozzle mix type pipe, 9 is an injection nozzle, 10 is Lubricant, 21 is an upper work roll, 22 is a lower work roll, 51 is a raw liquid pipe, 52 is a raw liquid flow controller, 61 is a water pipe, and 62 is a water flow controller.

  The overall apparatus configuration of the present invention will be described with reference to FIG. The lubricant 10 is injected from the upstream by the injection nozzle 9 toward the rolling portion of the strip 1 by the rolling mill 2. A plurality of injection nozzles 9 are installed in the width direction of the belt-like body 1, and as shown in FIG. 2, a plurality of injection nozzles 9 are also installed on the back side as well as the front side. The lubricant 10 is sprayed from the upstream toward the front surface side of the belt-like body 1 and the upper work roll 21, and toward the back surface side of the belt-like body 1 and the lower work roll 22.

  Thereby, the density | concentration and flow volume of the lubricant injected to a strip | belt body can be adjusted separately in the width direction and front and back, and it has a difference in the density | concentration and quantity of the lubricant drawn in to a roll bite.

  In addition, in adjusting the density | concentration and flow volume of the lubricant injected to a strip | belt body, in this invention, the lubricant is supplied to an injection nozzle with the nozzle mix type piping shown in FIG.

  The lubricant is supplied by mixing the lubricant stock solution 5 and the thinning solution water 6, but the present invention does not adopt a method using a number of mixing tanks having different concentrations as in the prior art document 1. . FIG. 3 shows the supply of the lubricant from the nozzle mix type pipe 8 to one injection nozzle 9.

  The undiluted solution 5 and the water 6 are respectively supplied by undiluted solution piping 51 and water piping 61 by a pump (not shown). The nozzle mix type pipe 8 has a configuration in which the stock solution pipe 51 and the water pipe 61 merge at the junction 7.

  The lubricant is brought to the injection nozzle 9 through the nozzle mix type pipe 8. At that time, the concentration / flow rate of the injected lubricant is adjusted by controlling the flow rate separately by the stock solution flow rate controller 52 and the water flow rate controller 62 provided in the middle of the stock solution pipe 51 and the water pipe 61. be able to.

  Compared to a system using a mixing tank, it is not necessary to prepare a large number of mixing tanks having different concentrations, and the concentration and flow rate of the lubricant injected for each installed injection nozzle can be finely adjusted.

  For shape control, the shape measurement result of the shape meter 3 installed on the exit side of the rolling mill 2 shown in FIG. 1 is sent to the control device 4, and the target concentration / flow rate of the lubricant from each injection nozzle 9. Further, the stock solution flow rate and the water flow rate in the nozzle mix type pipe are determined, and the determined stock solution flow rate and water flow rate are fed back to the stock solution flow rate controller 52 and the water flow rate controller 62, respectively.

  As for local elongation, the present invention can adjust the concentration and flow rate of the lubricant in the width direction more finely and with better responsiveness compared to the method described in Patent Document 1, so that a belt-like body having better flatness can be obtained. Can be manufactured.

  In addition, the L warpage that was a problem, that is, the warpage in the longitudinal direction of the belt-like body, compared with the past by providing a difference in the average concentration and flow rate of the lubricant across the width direction between the front surface and the back surface. It can be greatly prevented.

DESCRIPTION OF SYMBOLS 1 Strip body 2 Rolling mill 3 Shape meter 4 Control apparatus 5 Stock solution 6 Water 7 Merge part 8 Nozzle mix type piping 9 Injection nozzle 10 Lubricant 21 Upper work roll 22 Lower work roll 51 Stock solution piping 52 Stock solution flow controller 61 Water piping 62 Water flow controller

Claims (3)

Provide a plurality of injection nozzles in the width direction to inject the lubricant on the front and back surfaces of the belt-like body just before rolling,
A method for producing a belt-like body, comprising adjusting a concentration and a flow rate of a lubricant to the injection nozzle based on a shape measurement result of the belt-like body by a shape meter provided on the exit side of the rolling mill. In the manufacturing method of the strip | belt shaped object of Claim 1,
In supplying the lubricant to the injection nozzle,
Use a nozzle mix type piping where the stock solution piping and water piping of the lubricant merge at the junction,
A method for producing a strip-like body, wherein the flow rate is individually controlled by installing a flow rate controller in the middle of the stock solution pipe and the water pipe. An injection nozzle for injecting a lubricant, provided in the width direction on the front and back surfaces of the belt-like body just before rolling;
A nozzle mix type pipe for supplying a lubricant to the injection nozzle by combining a stock solution pipe and a water pipe of the lubricant at a junction; and
A flow controller provided in each of the stock solution pipe and the water pipe;
A shape meter that measures the shape of the strip on the exit side of the rolling mill,
An apparatus for manufacturing a belt-shaped body, comprising: a control device that determines a target concentration / flow rate of a lubricant based on a shape measurement result of the shape meter and commands the target flow rate to the flow rate controller.

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