A method for improving the edge wave of a finished base plate of a hazlet air conditioning foil

Abstract

One method to improve the edge waviness of the bottom plate of the finished Hazlett air conditioning foil is to use Hazlett continuous casting and rolling (three-stand rolling). The reduction of the first two stands is relatively large (more than 50%) and the reduction of the third stand is relatively small (less than 50%). Stable rolling is achieved on the basis of work hardening, and the plate shape is controlled. The reduction of the semi-finished product with a thickness of less than 0.24mm in the cold rolling pass is controlled below 40%. By increasing the reduction of the billet pass and the rolling deformation, the reduction deformation of the finished product pass is reduced. The starting rolling force can be reduced, which protects the support roll surface roughness from rapid decay and facilitates smooth starting.

Description

Technical Field

[0001] This article belongs to the technical field of edge waviness in finished Hazlett foil products, specifically relating to a method for improving the edge waviness of the base plate type in finished Hazlett air conditioning foil products. Background Technology

[0002] The Hazlete production line is widely used in the mass production of air conditioning foil in China due to its short process flow, energy saving and consumption reduction, low production cost and high efficiency. After being continuously cast and rolled by Hazlete, the coil is rolled with a large reduction in cold rolling. Internal stress is generated at different positions on the surface of the coil, which can easily lead to various types of plate waves. If the relevant process parameters are not properly adjusted and controlled during the finishing pass, it will result in serious edge looseness. Subsequent coating will cause a large amount of uncoated waste, which will seriously affect the yield of the coil.

[0003] In summary, exploring a method to improve the edge waviness of the bottom plate of the finished Hazlet air conditioning foil is of great significance for cost savings and yield improvement. Summary of the Invention

[0004] This paper proposes a method to improve the edge waviness of the bottom plate of the finished Hazlett air conditioning foil, the specific steps of which are as follows:

[0005] a. Using Hazlett billets, the Hazlett casting machine exit passes are allocated with a thickness of 19-7.8-3.8-2.1mm. The cold rolling process is 2.1-0.82-0.24mm, with edge trimming and annealing at -0.145-0.095mm. The pass allocation is: Hazlett continuous casting and rolling (three-stand rolling). The reduction of the first two stands is kept relatively large (above 50%), and the reduction of the third stand is kept relatively small (below 50%). Stable rolling is achieved on the basis of work hardening, and the plate shape is controlled. The reduction of the semi-finished product thickness below 0.24mm in the cold rolling pass is controlled below 40%. By increasing the reduction of the billet pass and the rolling deformation, the reduction deformation of the finished product pass is reduced, which can achieve a smaller starting rolling force. This protects the support roll surface roughness from rapid decay and facilitates smooth starting.

[0006] b. When rolling finished products of 0.145mm-0.095mm, use a non-circular sleeve, and the deformation concavity of the coiling sleeve should be ≤2mm.

[0007] c. The diameter of the winding flattening roller is a large roller diameter, keeping the roller system parallel. When starting the machine, the full length of the flattening roller is greater than the blank, and the convexity of the flattening roller is less than 0.04mm. By selecting a winding sleeve with a concavity of ≤2mm during deformation and by controlling the diameter, convexity, and level of the winding flattening roller, it is fully guaranteed that the flattening roller will flatten the material roll when starting the machine. The convexity of the flattening roller of less than 0.04mm can compensate for the looseness of the board surface when the material roll is loose, so that the board shape detection by the board shape roller is controlled.

[0008] d. When starting the rolling mill, the speed should be increased rapidly, reaching a rate of 700 m / min in 2 minutes. By increasing the speed rapidly and starting the mill with a positive bend, the amount of edge waviness in the initial rolling pattern can be reduced. The pattern changes and fluctuates greatly during the speed increase. The rapid speed increase can reduce the waste material loss caused by the pattern fluctuation. When starting the mill with insufficient roll thermal crown, the edges are prone to looseness. The positive bend can compensate for the loose parts of the edge pattern and reduce edge waviness waste.

[0009] e. When the positive bend value of the bottom bend is greater than 70% of the full value, the bending roller should be kept within the positive bend for less than 3 minutes during speed increase. The unit tension of the finished product winding should be given at 3.4~3.6 kg / mm2. Under this tension, the pattern roller can detect the true pattern, avoiding the pattern distortion and "false pattern" caused by starting the machine with high tension. The pattern of the detected pattern can be adjusted to the maximum extent.

[0010] f. The unit tension of winding is 3.4~3.6 kg / mm². Beneficial effects

[0011] By increasing the reduction and rolling deformation in the initial pass and reducing the reduction deformation in the finished pass, the starting rolling force can be reduced, which can both protect the support roll surface roughness from rapid decay and facilitate smooth starting.

[0012] By selecting a winding sleeve with a concavity of ≤2mm during deformation and adjusting the diameter, convexity, and level of the winding flattening roller, it is ensured that the flattening roller flattens the material roll during the initial setup. The 0.04mm convexity of the flattening roller can compensate for the looseness of the board surface when the material roll is loose, thus controlling the board shape detection by the board shape roller.

[0013] By rapidly increasing the speed and starting the machine with a positive bend, the amount of edge waviness in the base pattern can be reduced. When the speed is increased, the pattern changes and fluctuates greatly. Rapidly increasing the speed can reduce the waste material loss caused by the pattern fluctuation. When starting the machine with the base pattern, the heat crown of the roller is insufficient, and the edge is easy to loosen. By using a positive bend to compensate for the loose part of the edge pattern, the edge waviness waste material can be reduced.

[0014] The unit tension for winding the finished product is given as 3.4~3.6 kg / mm2. Under this tension, the pattern roller detects the true pattern, avoiding the pattern distortion and "false pattern" caused by starting the machine under high tension. The pattern detected can be adjusted to the maximum extent. Attached Figure Description

[0015] Figure 1 This is a flowchart of a method for improving the edge wave pattern of the base plate of a finished Hazlett air conditioning foil product. Detailed Implementation

[0016] To enhance understanding of the present invention, the invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only for explaining the invention and do not constitute a limitation on the scope of protection of the invention.

[0017] like Figure 1 As shown;

[0018] a. Using Hazlett billets, the thickness of the Hazlett casting machine exit pass is 19-7.8-3.8-2.1mm, the cold rolling process is 2.1-0.82-0.24mm, edge trimming, and annealing at -0.145-0.095mm;

[0019] b. When rolling finished products of 0.145mm-0.095mm, use a non-circular sleeve, and the deformation concavity of the coiling sleeve should be ≤2mm.

[0020] c. The diameter of the flattening roller is the large roller diameter. Keep the roller system parallel. When starting the machine, the full length of the flattening roller is greater than the blank. The crown of the flattening roller is less than 0.04mm.

[0021] d. When starting the rolling mill, rapidly increase the speed, accelerating to a rate of 700 m / min within 2 minutes;

[0022] e. When the positive bend value of the bottom bend is greater than 70% of the full value, the bending roller should remain within the positive bend for less than 3 minutes when the speed is increased.

[0023] f. The unit tension of winding is 3.4~3.6 kg / mm².

[0024] Implementation example;

[0025] Pass allocation: Hazlett continuous casting and rolling (three-stand rolling), maintaining a larger reduction (over 50%) in the first two stands and a smaller reduction (below 50%) in the third stand, achieving stable rolling based on work hardening, with controlled plate shape. For cold rolling passes, the reduction of semi-finished products with a thickness of less than 0.24mm is controlled below 40%. By selecting coiling sleeves with a concavity of ≤2mm during deformation and adjusting the diameter, crown, and level of the coiling flattening rolls, it is ensured that the flattening rolls flatten the coil during the initial rolling. The 0.04mm crown of the flattening rolls can compensate for the looseness of the plate surface when the coil is loose, making the plate shape detected by the plate shape rolls controllable. By rapidly increasing the speed and starting the machine with a positive bend, the amount of edge waviness of the initial plate shape can be reduced. The plate shape changes greatly when the speed increases. The unit tension of coiling for the finished product pass is given at 3.4~3.6kg / mm2. Under this tension, the plate shape detected by the plate shape rolls is true, avoiding the plate shape distortion and "false plate shape" caused by starting the machine with high tension.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for improving the edge waviness of the base plate of a finished Hazlett air conditioning foil product, characterized in that, The specific steps are as follows: a. Using Hazlett billets, the thickness of the Hazlett casting machine exit pass is 19-7.8-3.8-2.1mm, the cold rolling process is 2.1-0.82-0.24mm, edge trimming, and annealing at -0.145-0.095mm; b. When rolling finished products of 0.145mm-0.095mm, use a non-circular sleeve, and the deformation concavity of the coiling sleeve should be ≤2mm. c. Keep the roll system of the winding flattening rollers parallel. When starting the machine, the full length of the flattening rollers should be greater than the material. The crown of the flattening rollers should be less than 0.04mm. The crown can compensate for the looseness of the board surface when the material roll is loose. d. When starting the rolling mill, rapidly increase the speed, accelerating to a rate of 700 m / min within 2 minutes; e. When the positive bend value of the bottom bend is greater than 70% of the full value, the bending roller should remain within the positive bend for less than 3 minutes when the speed is increased. f. The unit tension of winding is 3.4~3.6 kg / mm².

2. The method for improving the edge waviness of the base plate of a finished Hazlett air conditioning foil product according to claim 1, characterized in that, When the thickness of the semi-finished product in the cold rolling pass is less than 0.24 mm, the thickness reduction during rolling is less than 40%.

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