Production method of titanium coil on traditional hot mill

Abstract

The invention relates to a production method of a titanium coil on a traditional hot rolling mill, which is characterized in that the titanium coil rolling process is researched and developed on a traditional hot rolling production line, secondary independent development is carried out on the basis of a Siemens secondary hot rolling model, the secondary independent development comprises optimization of a temperature limit value, adjustment of a rolling force, setting of a correction coefficient and the like, and a titanium coil suitable for carbon steel rolling and titanium coil rolling is formed. And the model library is also suitable for titanium coil rolling. According to the implementation of the method, under the condition that new equipment investment is not increased, a traditional hot rolling line can avoid titanium raw material manufacturing links with high energy consumption, high pollution and high technical barriers, the titanium raw material manufacturing links stride into the titanium material manufacturing field in a short, flat and fast mode, diversification of products is achieved, and the market competitiveness and the anti-risk capacity of enterprises are improved.

Description

Technical Field

[0001] This patent application belongs to the technical field of hot rolling methods, and more specifically, relates to a method for producing titanium coils on a traditional hot rolling mill. Background Art

[0002] Titanium strips are increasingly used in high-tech fields such as aerospace rockets, nuclear power, and military aircraft. The general production of titanium strips is to forge the blanks to the appropriate size, and then use a single-stand rolling mill to roll back and forth. After each rolling, the surface of the titanium strip needs to be polished, and then returned to the furnace for heating and insulation for a certain period of time, and then the second, third, or even fourth rolling and insulation are carried out, and finally the titanium strip is rolled into the target size.

[0004] Traditional steel rolling production lines cannot directly roll titanium coils. Many adjustments need to be made to the on-site instrument equipment and the Siemens secondary model. There is no mature experience to draw on, and the setting of each parameter needs to be explored one by one. It is impossible to produce continuous rolled titanium coils with high surface and high dimensional accuracy on traditional hot rolling mills. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for producing titanium coils on a traditional hot rolling mill. By controlling the collapse of the titanium billet and the black mark of the water beam in the furnace, solving the detection and signal tracking problems of on-site instrument equipment, adjusting the Siemens secondary model, etc., it is possible to produce continuous rolled titanium coils with high surface and high dimensional accuracy on a traditional hot rolling mill.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is: A method for producing titanium coils on a conventional hot rolling mill comprises the following steps: S1. Adjustment of Siemens secondary model temperature parameters: Modify the temperature limit in the Siemens secondary model so that the Siemens secondary model can calculate correctly and prevent program errors; S2. Rough rolling inlet temperature adjustment: the rough rolling inlet temperature of the rough rolling secondary model in the Siemens secondary model is replaced by the manually given value A; S3, modification of flying shear start signal: the new flying shear head signal after switching is used as the flying shear start signal, so that the flying shear head can cut normally and improve the threading stability; S4. Adjustment of the minimum rolling force for the looper to start: Correct the minimum rolling force for the looper to start, to prevent the looper from starting due to too low minimum rolling force during normal production; S5. Adjustment of furnace atmosphere and heating temperature: adjust the furnace gas to a neutral or weakly oxidizing atmosphere, and control the heating temperature and the slab cantilever to prevent the slab cantilever from being too long and causing a waist collapse, and prevent the black mark of the water pipe from affecting the temperature uniformity and rolling size accuracy of the slab; S6. Control the placement of the slab in the furnace: When the slab is in the soaking section of the walking beam heating furnace, the movable beam and the fixed beam are used to alternately "step" the titanium slab, which can reduce the thickness of the surface oxide layer while ensuring the heating effect and prevent the slab from collapsing; S7. Selection of rough rolling work rolls: The rough rolling work rolls use lower roll pressure; S8. Coiler front guide control: The coiler front guide does not participate in the centering control. A fixed opening G is given and the position control mode is adopted.

[0007] Due to the adoption of the above technical solution, the beneficial effects achieved by the present invention are: The present invention is to carry out the research and development of titanium coil rolling technology on the traditional hot rolling production line, and to carry out secondary independent development based on the Siemens secondary hot rolling model, including the optimization of limit values, the adjustment of the rolling force calculation program, the setting of correction coefficients, etc., to form a model library suitable for both carbon steel rolling and titanium coil rolling.

[0008] The implementation of the present invention can enable the traditional hot rolling line to avoid the titanium raw material manufacturing link with high energy consumption, high pollution and high technical barriers without increasing the investment in new equipment, and enter the titanium material manufacturing field in a short, flat and fast manner, thereby realizing product diversification and improving the market competitiveness and risk resistance of the enterprise. Therefore, it has extremely high value for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0010] The present invention is further described in detail below with reference to the embodiments.

[0011] A method for producing titanium coils on a conventional hot rolling mill, such as Figure 1 , using the following technical solutions: 1. Modify the temperature limit in the Siemens secondary model. In this embodiment, the Numeric value in Plantparameters andLimts is changed to 730-750, and the Lowerlimit is changed to 600-700 to ensure that the Siemens secondary model can calculate correctly and avoid program errors.

[0012] 2. The rough rolling inlet temperature in the rough rolling secondary model of the Siemens secondary model is replaced by an artificial given value A, and the value of the artificial given value A is 1000℃~1050℃. The Siemens secondary model contains many modules, and the rough rolling secondary model is one of them.

[0013] 3. Switch the flying shear head signal to the HMD pyrometer signal before shearing as the flying shear start signal to ensure normal shearing of the flying shear head and improve the threading stability.

[0014] 4. The minimum rolling force for starting the looper is corrected to prevent the looper from being affected by the small rolling force during normal production. The minimum rolling force for starting the looper is set to 1000~2000kN.

[0015] 5. Adjust the atmosphere and heating temperature in the furnace. The heating temperature is controlled at 870-890℃, preferably 880℃. The furnace gas is adjusted to a neutral or weakly oxidizing atmosphere. The slab cantilever is not more than 500mm, preferably 450mm. Prevent the slab cantilever from being too long and causing waist collapse, and prevent the black mark of the water pipe from affecting the temperature uniformity and rolling size accuracy of the slab.

[0016] 6. Control the placement of the slab in the furnace. When the slab is in the soaking section of the walking beam heating furnace, use movable beams and fixed beams to alternately perform "stepping" control on the titanium slab. The time interval is no more than 5 minutes. The "no more than 5 minutes" here means that the movable beam and the fixed beam are alternately controlled every 5 minutes, increasing the frequency of stepping control, reducing the thickness of the surface oxide layer while ensuring the heating effect, and preventing waist collapse.

[0017] 7. The rough rolling working roll uses a lower roll pressure with a range of 1.8 to 2.1.

[0018] 8. The front guide of the coiler does not participate in the centering control. A fixed opening G is given and the position control mode is adopted. The fixed opening G is 60~80mm higher than the target width of the titanium coil. For example, if the target width of the titanium coil is 500mm, the fixed opening G=500+60~80=560~580mm. There are two modes: pressure mode and position control mode. The pressure mode relies on pressure detection. When the pressure of the steel belt on the guide is too large and exceeds the set value, the guide will automatically open. The position control mode is that the guide remains stationary at a given opening.

[0019] From the above measures, it can be seen that this method is a secondary independent development based on the Siemens secondary hot rolling model, including the optimization of temperature limit values, the adjustment of the rolling force calculation program of the roughing mill and the finishing mill, the setting of correction coefficients, etc., which overcomes the problem of large deviation between the rolling force calculated by the traditional algorithm and the actual rolling force. It can enable the traditional hot rolling line to avoid the titanium raw material manufacturing link with high energy consumption, high pollution and high technical barriers without increasing the investment in new equipment, and enter the titanium material manufacturing field in a short, flat and fast manner, realize product diversification, improve the market competitiveness and risk resistance of enterprises, and achieve significant social and economic benefits.

Claims

1. A method for producing titanium coils on a conventional hot rolling mill, characterized in that The following steps are involved: S1. Adjustment of Siemens secondary model temperature parameters: Modify the temperature limit in the Siemens secondary model so that the Siemens secondary model can calculate correctly and prevent program errors; S2. Rough rolling inlet temperature adjustment: the rough rolling inlet temperature in the rough rolling secondary model of the Siemens secondary model is replaced by the manually given value A; S3, Flying shear start signal modification: switch the new flying shear head signal as the flying shear start signal, so that the flying shear head can cut normally and improve the threading stability; S4. Adjustment of the minimum rolling force for the looper to start: Correct the minimum rolling force for the looper to start, to prevent the looper from starting due to too low minimum rolling force during normal production; S5. Adjustment of furnace atmosphere and heating temperature: adjust the furnace gas to a neutral or weakly oxidizing atmosphere, and control the heating temperature and the slab cantilever amount; S6. Control the placement of the slab in the furnace: When the slab is in the soaking section of the walking beam heating furnace, the movable beam and the fixed beam are used to alternately "step" the titanium slab; S7. Selection of rough rolling work rolls: The rough rolling work rolls use lower roll pressure; S8. Coiler front guide control: The coiler front guide does not participate in the centering control. A fixed opening G is given and the position control mode is adopted.

2. The method for producing titanium coil on a conventional hot rolling mill according to claim 1, characterized in that: In S1, modify the values ​​of Numeric value and Lowerlimit in Plantparameters and Limits in the Siemens secondary model, and change the value of Numeric value to 730~750 and the value of Lowerlimit to 600~700.

3. The method for producing titanium coil on a conventional hot rolling mill according to claim 1, characterized in that: In S2, the range of the artificial given value A is 1000℃~1050℃.

4. The method for producing titanium coil on a conventional hot rolling mill according to claim 1, characterized in that: In S3, the flying shear head signal is switched to the pre-shear HMD pyrometer signal as the flying shear start signal to ensure the normal operation of the flying shear head.

5. The method for producing titanium coil on a conventional hot rolling mill according to claim 1, characterized in that: In S4, the minimum rolling force for loosening the loop is 1000~2000kN.

6. The method for producing titanium coil on a conventional hot rolling mill according to claim 1, characterized in that: In S5, the heating temperature is controlled at 870-890°C, and the slab cantilever amount is not greater than 500 mm.

7. A method for producing titanium coil on a conventional hot rolling mill according to any one of claims 1 to 6, characterized in that: In S6, the time interval of "step" control in the heating furnace shall not exceed 5 minutes.

8. The method for producing titanium coil on a conventional hot rolling mill according to claim 7, characterized in that: In S7, the middle and lower roll pressure range of the rough rolling working roll is 1.8 to 2.

1.

9. The method for producing titanium coil on a conventional hot rolling mill according to claim 8, characterized in that: In S8, the fixed opening degree G set by the front guide of the coiler is 60 to 80 mm higher than the target width of the titanium coil.

Images