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Method for controlling rolling mode of pinch pass mill set
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A control method and leveling technology, applied in the field of cold rolling, can solve the problems of unstable rolling, low roughness copy rate, and low precision
Active Publication Date: 2010-12-29
BAOSHAN IRON & STEEL CO LTD
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Because, for this type of steel, the set value of the total elongation is not large. When it is borne by two stands, the following two consequences may occur: (1) The rolling pressure is too small. At this time, the rolling mill The stiffness is a variable rather than a constant, which leads to unstable rolling and low elongation control accuracy; (2) Since the elongation of each stand is very small, the roughness copy rate is too small during the leveling process, which cannot be guaranteed Surface quality of the strip (the ability of the roll roughness to be copied to the strip surface during the skin pass process is closely related to the reduction rate and is non-linear)
At this time, it is not possible to use a double-frame skin pass machine to produce
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Embodiment 1
[0062] like figure 1 , as shown in 2 and 3, take the specification as 0.2*1020 and the steel type as MR2T3 (referred to as No. 1 typical specification product) as an example.
[0063] Step 1: Collect the equipment parameters of the double-frame leveling machine, mainly including: 1 # and 2 # Work rolldiameter D of the frame w1 = 460mm, D w2 = 460mm; 1 # and 2 # Raw roughness Ra of work rolls of rack r1 =0.8μm, Ra r2 = 2.0 μm; 1 # and 2 # Rack work roll rolling kilometers L 1 =100Km, L 2 = 100Km.
[0064] Step 2: Collect the key rolling process parameters of the product to be leveled, for No. 1 typical specification product: strip thickness H 1 =0.2mm, width B 1 =1020mm, material (strength) σ s1 =292Mpa, allowable range of elongationε min1 = 0.8% with ε max1 =1.2%, target elongation ε o =1.0%, incoming material roughness Ra 01 =1.2μm, the allowable range of finished product roughness Ra 1min1 =0.6μm and Ra 1max1 =0.8μm, finished product target roughness Ra ...
Embodiment 2
[0103] like figure 1 , as shown in 2 and 3, take the specification as 0.5*800 and the steel type as IF steel (referred to as No. 2 typical specification product) as an example.
[0104] Step 1: consistent with Example 1.
[0105] Step 2: Collect the key rolling process parameters of the product to be leveled, for the No. 2 typical specification product: strip thickness H 2 =0.5mm, width B 2 =800mm, material (strength) σ s2 =160Mpa, allowable range of elongation ε min2 = 0.5% with ε max2 = 0.6%, target elongation ε o =0.55%, incoming roughness Ra 02 =1.5μm, the allowable range of finished product roughness Ra 1min2 =1.0μm and Ra 1max2 =1.2μm, finished product target roughness Ra o =1.1μm, allowable range of front tension T 21min2 =16Mpa and T 21max2 =32Mpa, medium tension allowable range T 11min2 =32Mpa and T 11max2 =64Mpa, allowable range of back tension T 10min2 =16Mpa and T 10max2 =32Mpa;
[0106] Step 3: Pass tests such as Figure 4 shown, giving 1 # and 2...
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Abstract
The invention discloses a method for controlling a rolling mode of a pinch pass mill set so as to control 1# and 2# frames of the pinch pass mill. The method can realize the optimum control for specific elongation by choosing a proper rolling mode according to device parameters of a singe and double dual purpose pinch pass mill set and the technique parameters of belt materials, wherein the device parameters comprise a frame stiffness and ultimate tension and the technique parameters comprise the roughness of supplied material, the allowed scope for the roughness of the finished products, and the allowed scope for the specific elongation. The method can fully satisfy the customers in product mechanical property, surface quality, and the like, enhance the adaptability of the mill set to the products, lower the investment cost, exert the potential of the mill set and promote the use ratio of the device. The method of the invention is simple, clear and is suitable for on-line application.
Description
technical field [0001] The invention relates to the technical field of cold rolling, in particular to a method for controlling the rolling mode through the elongation rate for a tempering unit. Background technique [0002] As the process closest to the finished product in the production of cold-rolled strip, leveling can not only ensure the mechanical properties and shape quality of the annealed product by controlling the elongation and shape of the strip, but also form a certain roughness on the surface of the strip. , to achieve the purpose of improving the strip coating performance and formability. In this way, with the continuous improvement of the user's requirements for the mechanical properties, shape, and surface quality of the strip steel, the importance of the smoothing process has become increasingly prominent. Correspondingly, since the 1960s, leveling arrangements such as single-frame four (six) roller skin passers and double-frame four (six) roller skin passe...
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