JPH04100605A - Method for controlling gloss in rolling sheet - Google Patents

Abstract

PURPOSE:To make the unevenness of gloss smaller and to improve yield by continuously detecting the distribution of gloss in the width direction with a glass meter on the outlet side of a rolling mill and controlling the flow rate of rolling oil in the width direction based on that detected value. CONSTITUTION:The glass of a rolled sheet S is continuously detected at adequate interval for sampling by a glass detector 30. The detected value (g) is outputted to arithmetic devices 45, 46 for controlling. Required flow rate (a), (b) of rolling oil is calculated based on the detected value of gloss in the arithmetic devices 45, 46. The calculated results (a), (b) are respectively inputted into controllers 23, 24 and the flow rate of rolling oil which is supplied from spray nozzles 15, 16 to the roll bites is controlled. Thus, the distribution of gloss in the width direction is controlled with high accuracy and rapid responsiveness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for controlling the glossiness of a rolled plate during plate rolling.

The present invention is used for cold rolling of rolled plates (including foils) made of common steel, stainless steel, titanium, titanium alloys, and other metal materials that require excellent gloss.

[Prior Art] One of the qualities of metal plates used for electronic parts, ornaments, home appliances, and others is gloss. Generally, in order to obtain a rolled plate with excellent gloss, rolling is performed using work rolls with small surface roughness in the final bath.

Requirements regarding the gloss of rolled sheets have become increasingly diverse in recent years.

For example, a wide range of quality is required, from mirror-bright to mirror-bright, with approximately constant surface roughness. Also,
As the amount of rolling increases, the surface of the work roll becomes rougher, and the gloss of the rolled plate gradually deteriorates, but it is necessary to maintain the required gloss over the entire length of the plate. Therefore, in the past, when the surface of a work roll became rough and the gloss level deteriorated to some extent, the work roll was replaced with a new one. On the other hand, in order to ensure productivity, it is required to create different gloss levels and guarantee the gloss over the entire length of the plate without changing the rolling oil.

[Problems to be Solved by the Invention] Conventionally, the glossiness of a rolled plate has been observed by sampling at appropriate intervals during rolling or visually observing the rolling of one coil. Visual observation is not quantitative and has large observation errors. In addition, with sampling observations, it is not possible to continuously control the glossiness by changing the rolling conditions from time to time according to changes in the glossiness over time, and the observation results cannot be immediately reflected in the glossiness. Furthermore, rolling oil is supplied to the roll bite on the inlet side of the rolling mill, but if there is uneven lubrication in the width direction of the strip, uneven glossiness occurs in the width direction of the strip. For these reasons, there were many variations in gloss, and many products were scrapped because they could not achieve the required gloss. Therefore, there is an urgent need to develop continuous measurement of glossiness or continuous control of glossiness during rolling. In addition, as a method for measuring the glossiness of industrial products, JIS
Z 8741 (Glossiness measurement method).

Therefore, it is an object of the present invention to provide a glossiness control method that can reduce variations in glossiness and improve yield.

[Means for Solving the Problems] In the glossiness control method of the present invention, the glossiness distribution in the width direction of the rolled plate is continuously detected by a glossmeter on the exit side of the rolling mill. Then, the rolling oil flow rate distribution in the sheet width direction is controlled based on the detected glossiness distribution so that the rolled sheet has a required glossiness. Here, rolling oil means only rolling oil or an emulsion of rolling oil and water.

The gloss meter is a regular gloss meter equipped with a light source and a light receiver. In order to detect the glossiness distribution in the board width direction, a plurality of (for example, 3 to nozzle number) gloss meters are arranged along the board width direction.

The relationship between rolling oil flow rate and glossiness is determined in advance through experiments. FIG. 1 shows the influence of rolling oil flow rate and rolling oil temperature on the glossiness of the plate surface. As is clear from this graph, the gloss level increases as the rolling oil flow rate decreases or as the rolling oil temperature increases. Such data is stored in the control arithmetic unit and is used to determine the required rolling oil flow rate based on the detected gloss level.

To control the rolling oil flow rate distribution in the strip width direction, for example, a plurality of rolling oil spray nozzles (for example, 3 to 3 nozzles) are arranged in the strip width direction, and a flow rate control valve is operated for each spray nozzle. do.

[Function] The gloss distribution in the width direction of the strip is continuously detected by a gloss meter on the exit side of the rolling mill, and the rolling oil flow rate in the width direction of the strip is controlled based on the detected value. Therefore, the gloss distribution in the board width direction can be controlled with high lamination density and quick response.

[Example 2] Figures 2 and 3 show an example of an apparatus for carrying out the glossiness control method of the present invention.

A plurality of spray nozzles 15, 16 are arranged on the entrance side of the final stand 11 of the strip rolling mill row along the strip width direction.

The spray nozzles 15,16 supply an emulsion of rolling oil and water between the work roll 13 and the rolling plate S. The used emulsion is collected in tank 18. The emulsion flows from the tank 18 through the pipe 19, the pump 21, the branch pipe 26, and the flow control valve 28, and then returns to the spray nozzle 15.
．． 16. Each flow control valve 28 is independently controlled by controllers 23 and 24, respectively.

A glossiness detection device 3 is installed adjacent to the exit side of the rolling mill l”11.
0 is placed. The glossiness detection device 30 includes wiper rolls 31, 32 and presser rolls 36.37, 38.3.
9 and a plurality of gloss meters 41,42. The wiper roll 31 is in contact with the upper surface of the rolled plate S, and the wiper roll 32 is in contact with the lower surface of the rolled plate S. Presser roll 3
6.38 is on the upper surface of the rolling plate S, and the presser roll 37.3
9 are in contact with the lower surface of the rolled plate S, respectively. The plurality of gloss meters 41 are arranged directly above the presser roll 37, and the plurality of glossmeters 42 are arranged directly below the presser roll 41 along the board width direction. The gloss meters 41 and 42 consist of a light source that illuminates the surface of the rolled sheet S and a phototube that detects reflected light from the surface of the rolled sheet S (none of which are shown). The wiper rolls 31 and 32 are
Wipe off scale, rolling oil, etc. adhering to the rolled plate S to clean the plate surface. In addition, presser rolls 36, 37,
38.39 suppresses the vertical vibration of the rolled plate S and prevents the plate from waving. Therefore, the light from the light source of the gloss meter 41, 42 is not scattered on the plate surface. Due to these things,
The glossiness of the rolled plate S is accurately detected.

In the rolling equipment configured as described above, the glossiness detection device 30 is operated at an appropriate sampling interval (for example, 0.
The glossiness of the rolled plate S is continuously detected at intervals of 5 sec). The detected value g is output to control arithmetic units 45 and 46. The control calculation devices 45 and 46 calculate required rolling oil flow rates a and b based on the detected value of glossiness and the data shown in FIG. 1 above. The calculation results a and b are input to the controllers 23 and 24, respectively, and are sent to the spray nozzles 15 and 15.
The flow rate of rolling oil supplied from 16 to the roll bite is controlled. Note that, as shown in FIG. 1, the glossiness of the rolled plate S is also influenced by the temperature of the rolling oil. Therefore, a heater (not shown) provided in the tank 18 is adjusted to maintain the temperature of the rolling oil at a predetermined temperature.

Here, a specific example of gloss control in the above-mentioned rolling apparatus will be explained.

A 5LIS430 bright material was rolled under the following rolling conditions.

Work roll diameter: 150 mm x body length: 400 mIn Plate thickness: 0.78 mm Reduction rate: 18* Entry side tension 15 kgf/mm2 Output tension 20 Jf/mm2 Rolling speed: 100 m/min.

Work roll surface roughness: Approximately 0.02 μmRa During rolling under the above conditions, the gloss level is continuously detected, the required rolling oil flow rate is determined based on the detected value, and the flow rate is adjusted by the controllers 23 and 24. Valve 28 was controlled. As a result, the required glossiness can be obtained, and the average glossiness is G5.
(45') was 580. In addition, the gloss unevenness ΔGs in the board width direction was improved as follows.

In the case without glossiness control: ΔGs=50-80 In the case of glossiness control according to the present invention: ΔGs=20-40 However, ΔG S =G Sa + ax G Sm1n
The size of the wiper roll is 100 mtn in diameter.
X 1200mm, the roll body is made of cast iron,
The surface is covered with cloth approximately 5 mm thick. The size of the presser roll is diameter 10 (l ma + x 1200 mtn
It is.

In the above embodiment, the glossiness was controlled on both the upper and lower surfaces of the rolled plate, or it may be possible to control only one side. In addition, in FIG. 2, the presser roll 36 is the wiper roll 3.
1, the presser roll 37 may also serve as the wiper roll 32.

[Effects of the Invention] According to the present invention, the gloss distribution in the width direction of the strip is continuously detected on the exit side of the rolling mill using a gloss meter, and the rolling oil flow rate in the width direction of the strip is controlled based on the detected value. do. Therefore, the gloss distribution in the board width direction can be controlled with high precision and quick response. As a result, variations in glossiness are small and yield can be improved.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the influence of rolling oil flow rate on the glossiness of the plate surface, FIG.
It is a top view which shows the arrangement state of the rolling oil spray nozzle and the gloss meter in the apparatus shown in a figure. 11... Plate rolling stand, 13... Work roll,
15°16... Spray nozzle, 18... Tank, 2
1...Pump, 23.24-...Controller, 2
8...Flow control valve, 30...Glossiness detection device, 31
．． 32-...wiper roll, 36°37.38.39
...Press roll, 41.42-...Gloss meter, 45°46...Controlling arithmetic unit.

Claims (1)

[Claims] 1. On the exit side of the rolling mill, the gloss distribution in the width direction of the rolled plate is continuously detected by a gloss meter, and the plate is adjusted based on the detected gloss distribution so that the rolled plate has the required gloss. A glossiness control method in plate rolling, characterized by controlling the rolling oil flow rate distribution in the width direction (rolling oil also includes an emulsion of rolling oil and water).