Control method for avoiding aluminum powder pressing into surface of strip caused by EDT rolling process

Abstract

The present application relates to a kind of control method for avoiding EDT rolling process to cause aluminum powder to press into the surface of strip, comprising the following steps: (1) in the upper part of four-roll mill entrance, the entrance side above of tension roll is added a set of rolling oil spraying mechanism, each nozzle of spraying mechanism is inclined downward and sprays towards entrance side;(2) control four-roll mill cold rolling speed <300M / min;Four-roll mill is closed during rolling process Roll gap blowing mechanism and outlet blowing mechanism are manually controlled;(3) when four-roll mill is in EDT rolling mode, and the entrance thickness of strip ≥2.0mm, roll gap blowing mechanism and outlet blowing mechanism are automatically closed;(4) when the entrance thickness of strip ≥2.8mm, build tension of unwinding expansion shaft, and the main machine speed of four-roll mill ≥10m / min, open four-roll mill entrance rolling oil nozzle;When the main machine speed of four-roll mill <5m / min or main machine speed ≥300m / min, close four-roll mill entrance rolling oil nozzle.The method helps to avoid EDT rolling process to cause aluminum powder to press into the surface of strip.

Description

TECHNICAL FIELD

[0001] The application relates to a control method for avoiding aluminum powder from being pressed into the surface of a strip caused by an EDT rolling process. BACKGROUND

[0002] During the EDT rolling process of an aluminum strip, a large amount of aluminum powder is generated due to surface roughening. The aluminum powder cannot be flushed clean from the surface of the aluminum strip by the flushing and blowing effects of rolling oil in the rolling process of a rolling mill, so that the aluminum powder adheres to the entry tensioning roller, the working roller or the supporting roller, and the aluminum powder is pressed into the strip or leaves marks on the surface of the strip when passing through the working roller, finally affecting the quality of the strip. SUMMARY

[0003] The application aims to provide a control method for avoiding aluminum powder from being pressed into the surface of a strip caused by an EDT rolling process, which is helpful to avoid the aluminum powder from being pressed into the surface of the strip caused by the EDT rolling process.

[0004] The technical scheme of the application is as follows: a control method for avoiding aluminum powder from being pressed into the surface of a strip caused by an EDT rolling process, comprising the following steps:

[0005] (1) a set of rolling oil spraying mechanisms are added above the entry side of the upper tensioning roller of a four-roller mill, each nozzle of the spraying mechanism is inclined downward to spray toward the entry side, and the rolling oil pressure of the nozzle is 3 kg;

[0006] (2) the cold rolling speed of the four-roller mill is controlled to be less than 300 M / min, and the roll gap blowing mechanism and the outlet blowing mechanism are manually closed during the rolling process of the four-roller mill;

[0007] (3) when the four-roller mill is in the EDT rolling mode and the entry thickness of the strip is greater than or equal to 2.0 mm, the roll gap blowing mechanism and the outlet blowing mechanism are automatically closed;

[0008] (4) when the entry thickness of the strip is greater than or equal to 2.8 mm, the tension is established by the uncoiling expansion shaft, and the main machine speed of the four-roller mill is greater than or equal to 10 m / min, the four-roller mill entry rolling oil nozzle is opened; when the main machine speed of the four-roller mill is less than 5 m / min or the main machine speed is greater than or equal to 300 m / min, the four-roller mill entry rolling oil nozzle is closed.

[0009] Further, the spraying mechanism comprises an upper spraying pipe arranged above the entry side of the upper tensioning roller, a plurality of nozzles are arranged at intervals along the length direction of the upper spraying pipe, and the included angle between each nozzle and the horizontal plane is 55-65 degrees.

[0010] Further, 20 nozzles are arranged at intervals along the length direction of the upper spraying pipe, the distance between adjacent two nozzles is 100 mm, and the included angle between each nozzle and the horizontal plane is 60 degrees.

[0011] Further, a first lower tensioning roller is arranged below the front side of the upper tensioning roller, a second lower tensioning roller is arranged below the rear side of the upper tensioning roller, and two groups of lower spraying pipes are arranged on the lower side between the first lower tensioning roller and the second lower tensioning roller, and the lower spraying pipes are each provided with a nozzle with an upward spraying port at intervals along the length direction.

[0012] Further, the upper spraying pipes and the lower spraying pipes are each provided with a corner seat valve at one end, and the one end of the upper spraying pipes and the upper spraying pipes provided with the corner seat valve is connected with an oil supply pipeline, and the oil supply pipeline is provided with an electric control valve.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] 1. Because the aluminum powder generated in the rolling process mainly floats on the surface of the rolling oil, the method of filling a large amount of rolling oil between the strip and the roller can isolate the aluminum powder outside the roll gap, realize the contact position of the roll gap between the roll and the strip without aluminum powder, and thus avoid the purpose of pressing the aluminum powder into the strip.

[0015] 2. The roll gap blowing mechanism and the outlet lower blowing mechanism can effectively blow away the residual rolling oil on the surface of the strip, reduce the oil content on the surface of the strip, and thus improve the quality of the strip. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a schematic diagram of the installation structure of the spraying mechanism of the present application;

[0017] Fig. 2 It is a schematic diagram of the installation of the upper spraying pipe of the present application;

[0018] Fig. 3 It is a technical idea diagram of the present application;

[0019] In the figure: 1-first lower tensioning roller 2-upper tensioning roller 3-second lower tensioning roller 4-upper spraying pipe 5-upper nozzle 6-angle between the second tensioning roller and the strip 7-lower spraying pipe 8-fixing seat 9-rack 10-oil supply pipe 11-corner seat valve 12-strip. DETAILED DESCRIPTION

[0020] In order to make the above features and advantages of the present application more obvious and easy to understand, the following embodiments are specifically described, and the detailed description is as follows with reference to the accompanying drawings, but the present application is not limited thereto.

[0021] REFERENCE Figs. 1 to 3

[0022] A control method for avoiding aluminum powder pressing into the surface of the strip caused by the EDT rolling process. Since the aluminum powder generated during rolling mainly floats on the surface of the rolling oil, the method of filling a large amount of rolling oil between the strip and the roller can isolate the aluminum powder outside the roll gap, realize the contact position of the roll gap between the roll and the strip without aluminum powder, and thus achieve the purpose of avoiding aluminum powder pressing into the strip. Specifically, the method comprises the following steps:

[0023] (1) A set of rolling oil spraying mechanism is added above the inlet side of the upper tension roller of the four-roller mill, each nozzle of the spraying mechanism is inclined downward to the inlet side, and the rolling oil pressure of the nozzle is 3 kg (0.3 MPa);

[0024] (2) The cold rolling speed of the four-roller mill is controlled to be less than 300 M / min; the control method of the mill production is changed, the original normal rolling mode in which the guide pad roll gap blowing and the outlet blowing are opened is changed to the mode in which the roll gap blowing mechanism and the outlet blowing mechanism are manually closed during the rolling process of the four-roller mill;

[0025] (3) An electrical blowing automatic control function is added to automatically close the blowing under certain rolling conditions, and to automatically work under other conditions to avoid errors that may occur during the execution process caused by manual operation. The electrical automatic control conditions are as follows: when the four-roller mill is in EDT rolling mode and the inlet thickness of the strip is greater than or equal to 2.0 mm, the roll gap blowing mechanism and the outlet blowing mechanism are automatically closed;

[0026] (4) When the inlet thickness of the strip is greater than or equal to 2.8 mm, the coiling tension is established, and the main machine speed of the four-roller mill is greater than or equal to 10 m / min, the rolling oil nozzles of the four-roller mill rolling oil spraying device are opened;

[0027] When the main machine speed of the four-roller mill is less than 5 m / min or the main machine speed is greater than or equal to 300 m / min, the rolling oil nozzles of the four-roller mill rolling oil spraying device are closed.

[0028] In addition, in order to realize manual automatic switching, an automatic and manual control button can also be added to the main control panel / screen of the four-roller mill. In the automatic state, all manual valves are normally open, and the automatic control conditions are automatically selected; in the manual state, all pneumatic control valves are automatically opened, the automatic control conditions are invalid, and the manual valves are used for control.

[0029] In the embodiment, the four-roller mill body is mainly composed of an entrance three-roller tension device, a rolling oil spraying device, two working rollers and two supporting rollers. The entrance three-roller tension device is mainly composed of an upper tension roller 2, a first lower tension roller 1 located below the front side of the upper tension roller, and a second lower tension roller 3 located below the rear side of the upper tension roller. The working roller seat is provided with a guide plate, and the guide plate is provided with a roller gap blowing mechanism of compressed air. The lower surface of the four-roller mill body outlet is provided with a 45-degree compressed air blowing device on both sides, forming an outlet lower blowing mechanism. In the rolling process, the roller gap blowing mechanism and the outlet lower blowing mechanism can effectively blow away the residual rolling oil on the surface of the strip, reduce the oil content on the surface of the strip, and thus improve the quality of the strip. The rolling oil spraying device includes the above spraying mechanism.

[0030] In the embodiment, the spraying mechanism includes an upper spraying pipe 4 arranged above the entrance side of the upper tension roller 2. The upper spraying pipe is provided with 20 nozzles 5 at intervals along the length direction, and the distance between the adjacent two nozzles is 100 mm. The included angle between the nozzles and the horizontal plane is 60°. Through continuous spraying in the rolling process, an oil collecting area (rolling oil filling area) exceeding 100 mm wide is formed between the first lower tension roller 1 and the upper tension roller 2, as shown in FIG. 2. The entrance coil is continuously cleaned, and the aggregation of aluminum powder is reduced. Fig. 3

[0031] In the embodiment, two groups of lower spraying pipes are arranged on the lower side between the first lower tension roller and the second lower tension roller. The lower spraying pipes are each provided with 20 upward nozzles at intervals along the length direction. The distance between the adjacent lower nozzles is 100 mm, and the rolling oil pressure is 3 kg, so as to spray the first lower tension roller and the second lower tension roller.

[0032] In the embodiment, in order to facilitate the installation of the upper spraying pipe and the lower spraying pipe, the two end portions of the upper spraying pipe and the lower spraying pipe are fixedly connected with the mill frame through the fixing seat 8.

[0033] In the embodiment, in order to realize the electrical control of the upper spraying pipe and the lower spraying pipe, the one end of the upper spraying pipe and the lower spraying pipe is provided with an angle seat valve 11. The one end of the upper spraying pipe and the lower spraying pipe provided with the angle seat valve is connected with the oil supply pipeline 10, and the oil supply pipeline is provided with an electric control valve.

[0034] The above only describes the preferred embodiment of the present application. According to the teaching of the present application, a person of ordinary skill in the art can design different forms of control method for avoiding the aluminum powder pressed into the surface of the strip caused by the EDT rolling process without creative labor. Any equivalent change, modification, replacement and transformation made within the scope of the patent application of the present application without departing from the principles and spirits of the present application shall fall within the scope of the present application.​

Claims

1. A control method for avoiding the pressing of aluminum powder into the surface of a strip caused by an EDT rolling process, characterized in that, It comprises the following steps: (1) A set of rolling oil spraying mechanism is added above the inlet side of the upper tension roll of the four-roll mill, each nozzle of the spraying mechanism is inclined downward to the inlet side, the rolling oil pressure of the nozzle is 3 kg; the spraying mechanism comprises an upper spraying pipe arranged above the inlet side of the upper tension roll, a plurality of nozzles are arranged at intervals along the length direction of the upper spraying pipe, and the included angle between the nozzles and the horizontal plane is 55°-65°; a first lower tension roll is arranged below the front side of the upper tension roll, a second lower tension roll is arranged below the rear side of the upper tension roll, and two sets of lower spraying pipes are arranged below the lower side between the first lower tension roll and the second lower tension roll, and the upper spraying pipes are all arranged at intervals along the length direction and have nozzles with upward spout; (2) The cold rolling speed of the four-roll mill is controlled to be less than 300 M / min; the roll gap blowing mechanism and the outlet blowing mechanism are manually closed during the rolling process of the four-roll mill; (3) When the four-roll mill is in the EDT rolling mode, and the inlet thickness of the strip is greater than or equal to 2.0 mm, the roll gap blowing mechanism and the outlet blowing mechanism are automatically closed; (4) When the inlet thickness of the strip is greater than or equal to 2.8 mm, the tension is established by the coiling and expanding shaft, and the main machine speed of the four-roll mill is greater than or equal to 10 m / min, the inlet rolling oil nozzle of the four-roll mill is opened; when the main machine speed of the four-roll mill is less than 5 m / min or the main machine speed is greater than or equal to 300 m / min, the inlet rolling oil nozzle of the four-roll mill is closed.

2. The control method of avoiding the aluminum powder pressed into the surface of the strip caused by the EDT rolling process according to claim 1, characterized in that, The upper spraying pipe is arranged at intervals along the length direction and has 20 nozzles, the distance between adjacent two nozzles is 100 mm, and the included angle between the nozzles and the horizontal plane is 60°.

3. The control method of avoiding the aluminum powder pressed into the surface of the strip caused by the EDT rolling process according to claim 1, wherein, One end of the upper spraying pipe and the lower spraying pipe is provided with an angle seat valve, and the end of the upper spraying pipe and the lower spraying pipe provided with the angle seat valve is connected with the oil supply pipeline, and the oil supply pipeline is provided with an electric control valve.

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