CN105251768B - Method for rolling ultra-thin cold-rolled tinning black plate - Google Patents

Abstract

Disclosed is a method for rolling an ultra-thin cold-rolled tinning black plate. As for a tinning black plate of MRT-3 and MRT-4 steel types and with band steel inlet width being 800-850 mm, inlet thickness being 1.7-1.8 mm and rolling thickness being 0.17-0.18mm, a five-rack acid pickling cold continuous rolling unit is used for production; a distribution mode with relatively balance motor power is used for rolling loads; the rolling reduction of each rack is determined according to the motor power model calculated value of each rack; the cold continuous rolling tension system, the cold continuous rolling working roller and middle roller bending system, the low-speed rolling process additional tension system, the roller technological parameters and the rolling process emulsion technological parameters are reasonably set, so that the unit speed is optimized, the rolling loads of all the racks are distributed in balance, the unit rolling speed and the equipment productivity are improved, and energy and electricity consumption of the unit is greatly reduced; the production cost is reduced, and good plate shape quality of an outlet cold-rolled plate is guaranteed.

Description

A kind of very thin cold-rolling tinning original plate milling method

Technical field

The invention belongs to metallic material pressure manufacture field, more particularly to MRT-3, MRT-4 steel grade, thickness 0.20mm with Under very thin cold rolling tin trip milling method.

Background technology

With our people's growth in the living standard, domestic tin plate demand sustainable growth in recent years, production capacity is also drastically It is promoted to 4,400,000 tons.But consider that China's tin plate market also reaches far away the degree of saturation from pre-capita consumption.According to statistics, mesh Preceding tin plate system packaging pre-capita consumption (referring mainly to beverage, can, food etc.) Asia is 1.5kg, Europe is 6.9kg, the U.S. is 8.4kg, China are about 2kg；From tinned food level of consumption statistics, China year 1.5kg under consumption, European tinned food per capita Year level of consumption 50kg per capita, Japan's level of consumption annual per capita is 23kg, therefore is taken a long view, the tin plate market of China Have a high potential, this is also that domestic enterprise steps up to invest the main cause of tin plate project.

Different from common steel grade, the yield strength of uncoated tinplate base is larger with work hardening index, and in the same circumstances, it rolls The setting of code is just attacked as scene considerably beyond common steel grade, therefore in the operation of rolling for pressing pressure, roll torque, rolling power The emphasis of pass.If code setting is unreasonable, just occur a certain frame excess load and other frames rolling potentiality without abundant Play, alarm occurs in scene, it has to which reduction of speed is produced, so as to influence the situation of production capacity.In the past in the production process of uncoated tinplate base In, because technology control model code sets unreasonable, frame pressure distribution in downstream is excessive, occurs in that upstream stand (mainly First, second frame, because the two machine frame rolling mill muzzle velocities are smaller) rolling load still has a larger surplus, and downstream frame But there is the problem of excess load in (mainly the four, the 5th frames), and scene is had to reduction of speed production, so as to have a strong impact on unit The performance of production capacity, larger economic loss is brought to factory.

Obviously, exploitation tin plate can further optimize and revise product structure, transform mode of economic growth.Tin plate pickling The technological parameter system of cold continuous rolling is the core system and key problem in technology for producing tin plating panel products, so research and development are a set of complete Tin plate pickling cold continuous rolling technological parameter system, is the most important thing of tin plate production.

In " a kind of rolling mill practice of high-strength cold rolling strip " that application number 201210002077.3 is provided, its rolling mill practice It is mainly used in rolling high-strength cold-strip steel Trip780 steel grades, the rolling mill practice for Ultra-thin uncoated tinplate base is not proposed Method.In " production method of secondary cold-rolling tinning original plate " disclosed in application number 200910063936.8, although propose rolling Strip reduction ratio and production procedure during uncoated tinplate base, but do not provide any process parameter value of rolling uncoated tinplate base.

The content of the invention

The present invention is intended to provide one kind can make each frame rolling load be equalized distribution, improve unit mill speed and set Standby production capacity, reduces units consumption, it is ensured that the very thin cold-rolling tinning original plate milling method of strip shape quality.

Therefore, the solution that the present invention is taken is：

A kind of very thin cold-rolling tinning original plate milling method, it is characterised in that for MRT-3, MRT-4 steel grade, strip entrance Width is in 800~850mm, inlet thickness in the specific side that 1.7~1.8mm, rolling thickness are 0.17~0.18mm uncoated tinplate bases Method is：

Produced using five frame pickling tandem mills, the rolling load relations of distribution are：First frame is adopted to the 5th frame With the method for salary distribution of power of motor relative equilibrium, i.e., each frame pressure is determined according to each gantry motor power module calculated value Measure, relative scale relation is：(30~35)：(38~42)：(38~42)：(38~42)：(30~35).

Cold continuous rolling tension schedule：It is set to from six unit tensions of the first frame entrance to the 5th rack outlet：50~ 60MPa, 135~150MPa, 160~175MPa, 180~200MPa, 190~210MPa, 60~80MPa.

Cold continuous rolling roller system：It is set as from five work roll bending power of the first frame to the 5th frame：280~ 300kN, 610~630kN, 410~440kN, 400~430kN, 280~310kN；From the first frame to five of the 5th frame Intermediate calender rolls bending roller force is set as：80~95kN, 180~195kN, 130~145kN, 130~145kN, 85~100kN.

Low speed rolling process additional tension system：First frame is respectively set as to unit additional tension between the 5th frame： 18~22MPa, 35~46.6MPa, 40~50MPa, 45~55MPa；Additional tension is in outlet strip raising speed to 280 meters per minute Do not reset afterwards.

Roller technology parameter setting：First frame 0.9~1.2um of work roll surface roughness, the second frame to the 5th machine Frame work roll surface roughness is 0.6~0.8um.

Operation of rolling emulsion processing parameter setting：First frame to the 5th frame rolling emulsion concentration be 3.2%~ 3.6%.

Beneficial effects of the present invention are：

1st, the present invention is by setting rational intermediate calender rolls work roll bending power, it is ensured that outlet cold-reduced sheet has good plate Form quality amount.

2nd, the present invention optimizes unit speed by the pressure distribution and gantry speed of given 5 frames, can make each frame Rolling load is equalized distribution, improves unit mill speed and equipment capacity.

3rd, the present invention can greatly reduce the electricity power consumption of unit by providing rational roll-force and power of motor, Reduce production cost.

Specific embodiment

By taking tin plating quenched and tempered steel MRT-4 as an example, rolled using big compression ratio, product is thick by raw thickness 1.8mm mill products Degree 0.2mm, strip width is 850mm, and overall compression ratio is 89%, reaches the limiting value of similar steel grade compression ratio.

First frame to the 4th frame uses power of motor allocation model, and relative power load sharing ratio is 32：40：40： 40：35.

It is set to from six unit tensions of the first frame entrance to the 5th rack outlet：55MPa, 140MPa, 167MPa, 189MPa, 205MPa, 68MPa.First frame is set to unit additional tension between the 5th frame：20.6MPa, 37.6MPa, 45.7MPa, 50.6MPa.

It is set as from five work roll bending power of the first frame to the 5th frame：290kN, 613kN, 422kN, 408kN, 289kN；It is set as from five intermediate calender rolls bending roller forces of the first frame to the 5th frame：88kN, 187kN, 136kN, 136kN, 92kN。

First frame work roll surface roughness 1.0um, the second frame is to the 5th frame work roll surface roughness 0.8um.First frame is 3.5% to the 5th frame rolling emulsion concentration.

MRT-4 products, rolling technological parameter such as table 1 are rolled using the rolling process.

The cold rolling tin plating MRT-4 belt steel rollings technological parameter of table 1

	First frame	Second frame	3rd frame	4th frame	5th frame
						Speed m/min	229	379	620	858	1327
Roll-force mn	6.96	7.75	6.87	7.21	6.97
						Thickness mm	1.134	0.683	0.420	0.303	0.200
Compression ratio %	37.02	39.78	38.4	28.1	33.85
						Work roll bending power kN	295.1	631.6	441.4	435.3	316.3
Intermediate calender rolls bending roller force kN	101.8	217.9	152.1	151.6	107.3
						Emulsion concentration %	3.5	3.5	3.5	3.5	3.5
Working roll roughness um	1.0	0.8	0.8	0.8	0.8

Operation of rolling muzzle velocity reaches the 98.3% of maximum, and roll-force is less than 10MN, less than 2000 tons, power of motor Less than 4200KW.It is 0.8% to roll rear strip thickness deviation, and plate shape precision average is 4.9I.Can by actual rolling technological parameter To analyze, MRT-4 products, by thickness, 1.8 millimeters are rolled 0.2 millimeter of finished product, under conditions of like product limited compression ratio, are led to Cross above-mentioned technique optimization method, it is possible to achieve stable rolling, mill load is balanced, meets capacity of equipment, and product quality reaches mark Alignment request.

Claims (1)

1. a kind of very thin cold-rolling tinning original plate milling method, it is characterised in that for MRT-3, MRT-4 steel grade, strip entrance is wide Degree is in 800~850mm, inlet thickness in the specific method that 1.7~1.8mm, rolling thickness are 0.17~0.18mm uncoated tinplate bases For：

Produced using five frame pickling tandem mills, the rolling load relations of distribution are：First frame to the 5th frame is using electricity The method of salary distribution of acc power relative equilibrium, i.e., determine each frame drafts, phase according to each gantry motor power module calculated value Comparative example relation is：（30~35）：（38~42）：（38~42）：（38~42）：（30~35）；

Cold continuous rolling tension schedule：It is set to from six unit tensions of the first frame entrance to the 5th rack outlet：50~60MPa, 135~150MPa, 160~175MPa, 180~200MPa, 190~210MPa, 60~80MPa；

Cold continuous rolling roller system：It is set as from five work roll bending power of the first frame to the 5th frame：280~300kN, 610~630kN, 410~440kN, 400~430kN, 280~310kN；From five intermediate calender rolls of the first frame to the 5th frame Bending roller force is set as：80~95kN, 180~195 kN, 130~145kN, 130~145kN, 85~100kN；

Low speed rolling process additional tension system：First frame is respectively set as to unit additional tension between the 5th frame：18~ 22MPa, 35~46.6MPa, 40~50MPa, 45~55MPa；Additional tension outlet strip raising speed to after 280 meters per minute not Reset；

Roller technology parameter setting：First frame 0.9~1.2um of work roll surface roughness, the second frame to the 5th frame work 0.6~0.8um is as roll surface roughness；

Operation of rolling emulsion processing parameter setting：First frame to the 5th frame rolling emulsion concentration is 3.2%~3.6%.