CN104550266B - Soft measurement method of thickness in periodicity thickness changing strip rolling process - Google Patents

Abstract

Soft measurement method of thickness in periodicity thickness changing strip rolling process of the present invention belongs to rolling technical field.Comprise the steps:, according to exit thickness, band equal thickness district and transition region are carried out subregion；Measure band linear velocity v at inlet of rolling mill_inLinear velocity v with outlet_out；Calculate supplied materials length L_inWith outlet length L_out；Equal thickness district thickness h_cHard measurement；Transition region thickness h_tHard measurement.System includes: milling train, is respectively arranged with coiling machine in the both sides of milling train, is provided with measuring roller between coiling machine and milling train；Measuring roller axle head is provided with encoder, and signal enters computer control system, it complete thickness hard measurement.The soft measurement method of thickness of the present invention, under conditions of pepriodic rolling, can accurately calculate equal thickness district and the thickness of transition region of poor slab, and the THICKNESS CALCULATION error in equal thickness district can reach ± 1.5%, and the thickness error of transition region can reach ± 3%.

Description

Soft measurement method of thickness in periodicity thickness changing strip rolling process

Technical field

The invention belongs to metal rolled technical field, particularly to a kind of periodicity thickness changing strip rolling process In soft measurement method of thickness.

Background technology

Rolling periodic variable-thickness strips technology is a kind of new production technology, such as in auto parts produce, Periodic variable-thickness band becomes poor slab after crosscutting, in order to replace laser assembly solder plate；As automobile stamping Part is to alleviate car weight, it is achieved the energy-saving and emission-reduction of automobile.Thickness control in periodicity thickness changing strip rolling process System is a key problem, and the key of THICKNESS CONTROL then with which type of method measurement is continually changing Thickness of strip.

Generally thickness measure can use and directly measure and hard measurement (indirectly measuring) two ways.

First kind of way need to purchase calibrator equipment installation and debugging, and gamma thickness gage also needs to radioprotective and processes, Relatively costly.Owing to calibrator distance milling train outlet still has a segment distance, thickness measurement data has in time Certain delay, real-time is bad.

The second way need not invest separately, can directly use model to calculate the moment thickness of milling train outlet Degree, real-time is good.Can also use the measurement result of first kind of way calibrator that model parameter is carried out simultaneously Revise, improve thickness hard measurement precision.

Periodic variable-thickness rolling is the highest to requirement of real-time, such as: when mill speed is 0.5m/s, length Equal thickness district rolling time for 100mm is 0.2s.Using the second way is the most feasible scheme.

Summary of the invention

For the feature of rolling periodic variable-thickness strips technique and the problem to thickness control accuracy requirement, this Invention provides the soft measurement method of thickness in a kind of periodicity thickness changing strip rolling process, adopts in this way Thickness of strip is carried out on-line checking, not only economical reliable, and dynamic response is rapid, can provide thickness continuously Measured value, it is easy to reach thickness of strip control accuracy must be asked.

The present invention be the technical scheme is that a kind of rolling periodic variable-thickness strips for achieving the above object During soft measurement method of thickness, comprise the following steps:

Several equal thickness district and transition regions of band are divided according to exit thickness；

Measure band linear velocity v at inlet of rolling mill_inLinear velocity v with milling train outlet_out；

Calculate supplied materials length L_inWith outlet length L_out；

Equity caliper zones thickness h_cWith transition region thickness h_tCarry out hard measurement.

Described band is in linear velocity v of inlet of rolling mill_inLinear velocity v with milling train outlet_outMeasuring method be:

Measure inlet of rolling mill and the rotating speed of outlet measuring roller: install at entrance and exit measuring roller axle head respectively and compile Code device, signal accesses computer control system, measures the rotating speed N of entrance measuring roller_inWith outlet measuring roller Rotating speed N_out；

Calculate linear velocity v of inlet of rolling mill_inV with milling train outlet_out, it is calculated as follows:

$v_{\mathrm{in}}=\mathrm{\π}\·\frac{N_{\mathrm{in}}\·D_{\mathrm{in}}}{60}$

$v_{\mathrm{out}}=\mathrm{\π}\·\frac{N_{\mathrm{out}}\·D_{\mathrm{out}}}{60}$

Wherein, D_inFor entrance measuring roller diameter, D_outFor outlet measuring roller diameter.

Described supplied materials length L_inWith outlet length L_outComputational methods be:

$L_{\mathrm{in}}\left(n\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{v}_{\mathrm{in}}\left(i\right)\·T_C$

$L_{\mathrm{out}}\left(n\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{v}_{\mathrm{out}}\left(i\right)\·T_C$

Wherein L_inN () is L_inAt the value of calculation in n moment, L_outN () is L_outAt the value of calculation in n moment, T_CFor The computer control system sampling time.

Described equal thickness district thickness h_cFlexible measurement method in the n moment is:

$h_c\left(n\right)=H_{\mathrm{in}}\·\frac{L_{\mathrm{in}}\left(n\right)}{L_{\mathrm{out}}\left(n\right)\·(1+a)}$

Wherein, a is thickness correction factor, H_inFor inputting supplied materials thickness, for fixed value, L_inN () is the n moment Supplied materials length, L_outN () is the outlet length in n moment.

Described transition region thickness h_tThe n moment flexible measurement method be:

$h_t\left(n\right)=H_{\mathrm{in}}\·\frac{v_{\mathrm{in}}\left(n\right)}{v_{\mathrm{out}}\left(n\right)\·(1+a)}$

Wherein, a is thickness correction factor, H_inFor inputting supplied materials thickness, for fixed value, v_inN () is the n moment Band is at the linear velocity of inlet of rolling mill, v_outN () is the linear velocity that n moment band exports at milling train.

Advantages of the present invention and have the beneficial effect that the soft measurement method of thickness condition in pepriodic rolling of the present invention Under, can accurately calculate equal thickness district and the thickness of transition region of poor slab, the THICKNESS CALCULATION error in equal thickness district Can reach ± 1.5%, the thickness error of transition region can reach ± 3%.

Accompanying drawing explanation

Fig. 1 is the program flow diagram of the method for controlling thickness of the present invention；

Fig. 2 is the structural representation of the thickness control system of the present invention；

Wherein, 1 human-computer interface computer, 2 computer control systems, 3 right coiling machines, 4 milling trains, 5 encoders, 6 right measuring rollers, 7-hydraulic cylinder, 8 left measuring rollers, the left coiling machine of 9-.

Fig. 3 is that band divides equal thickness district and the schematic diagram of transition region.

Detailed description of the invention

Below in conjunction with the accompanying drawings and embodiment the present invention is described in further detail.

As it is shown in figure 1, the soft measurement method of thickness in periodicity thickness changing strip rolling process, including as follows Step:

Step one: band equal thickness district and transition region carried out subregion according to exit thickness:

In order to equal thickness district and transition region to periodic variable-thickness band implement thickness hard measurement respectively, first First, subregion on rolled piece is needed, as it is shown on figure 3, set rolling direction as from left to right.Wherein A1, A2, A3 Represent the equal thickness district of a kind of thickness specification；B1, B2, B3 represent the equal thickness of another kind of thickness specification District；AB1, AB2, AB3 represent that A district is to B district transition region；BA1, BA2 represent the transition to A district of the B district District.

Step 2: measure band linear velocity v at inlet of rolling mill_inLinear velocity v with outlet_out:

As in figure 2 it is shown, install encoder at entrance and exit measuring roller axle head respectively, signal accesses computer Control system, calculates the rotating speed N of entrance measuring roller_inRotating speed N with outlet measuring roller_out。

Linear velocity v_inAnd v_out, it is calculated as follows:

$v_{\mathrm{in}}=\mathrm{\π}\·\frac{N_{\mathrm{in}}\·D_{\mathrm{in}}}{60}$

$v_{\mathrm{out}}=\mathrm{\π}\·\frac{N_{\mathrm{out}}\·D_{\mathrm{out}}}{60}$

Wherein D_inFor entrance measuring roller diameter, D_outFor outlet measuring roller diameter.

Step 3: calculate supplied materials length L_inWith outlet length L_out:

The computer control system discrete formula of employing:

$L_{\mathrm{in}}\left(n\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{v}_{\mathrm{in}}\left(i\right)\·T_C$

$L_{\mathrm{out}}\left(n\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{v}_{\mathrm{out}}\left(i\right)\·T_C$

Wherein L_inN () is L_inAt the value of calculation in n moment, L_outN () is L_outAt the value of calculation in n moment, T_CFor calculating The machine control system sampling time.

Step 4: equal thickness district thickness h_cHard measurement:

Supplied materials thickness H is inputted in man machine interface_in, h_cValue of calculation h in the n moment_cN () uses equation below to calculate:

$h_c\left(n\right)=H_{\mathrm{in}}\·\frac{L_{\mathrm{in}}\left(n\right)}{L_{\mathrm{out}}\left(n\right)\·(1+a)}$

Wherein a is thickness correction factor, and usual value is that the span of ceofficient of spread, such as strip steel exists Between 0～0.05.

Step 5: transition region thickness h_tHard measurement:

Supplied materials thickness H is inputted in man machine interface_in, h_tValue of calculation h in the n moment_tN () uses equation below to calculate:

$h_t\left(n\right)=H_{\mathrm{in}}\·\frac{v_{\mathrm{in}}\left(n\right)}{v_{\mathrm{out}}\left(n\right)\·(1+a)}$

As in figure 2 it is shown, the soft measurement method of thickness in described periodicity thickness changing strip rolling process, bag Include milling train 4, be respectively arranged with left coiling machine 9, right coiling machine 3 in the both sides of milling train 4, at left coiling machine 9 And it is provided with left measuring roller 8 between milling train 4, between right coiling machine 3 and milling train 4, is provided with right measuring roller 6； Being provided with the hydraulic cylinder 7 of inbuilt displacement sensor on milling train 4, the displacement transducer of described hydraulic cylinder 7 is used In the roll gap measuring milling train 4；It is separately provided for measuring surveys at left measuring roller 8, the axle head of right measuring roller 6 The encoder 5 of long roller rotating speed；The displacement transducer of described hydraulic cylinder 4 and encoder 5 respectively with computer control System 2 processed is connected.

Described milling train 4 uses four roll reversing rollers, it by frame, roller system, power transmission shaft, herringbone gear, The part composition such as motor and reductor.In order to reduce roll-force, increasing reduction in pass, the present invention uses relatively Little work roll diameter, according to the difference of milling train width, work roll diameter can be taken as 110～300mm.Described Coiling machine be made up of the part such as motor, reductor, reel, when implementing reversible rolling, inlet of rolling mill one The coiling machine of side as uncoiler, outlet side as coiling machine.

Described is high-resolution pulse codr for measuring the encoder 4 of measuring roller rotating speed, is used for surveying The speed of amount rolled piece.The length that milling train 4 entrance and exit band rolled is calculated by the rotating speed of measuring roller, As band Ge Duan district's starting point and the tracking of length and thickness hard measurement.

Described computer control system 2 is made up of human-computer interface computer 1 and computer control system.People Machine interface computer 1 is for operation of rolling monitoring and rolling procedure setting value；Computer control system is according to setting Definite value and operational order, execution cycle property variable-thickness strip rolling process, it is achieved thickness hard measurement function.

Embodiment 1:

The relevant parameter of the system of the present invention is as follows:

Using 450mm tetra-roll reversing roller, hydraulic system pressure is 21MPa, and the inbuilt displacement of hydraulic cylinder passes Sensor range is 100mm, and resolution is 0.001mm.

Supplied materials situation: steel grade is Q345, width 220mm, thickness 2.2mm.

Product size: equal thickness district A: thick 1.0mm, long 685mm；Equal thickness district B: thick 2.0mm, Long 87mm；Transition region: long 100mm.

Mill speed sets: 0.3m/s.

Thickness hard measurement precision: equal thickness district A: measurement error is ± 0.012mm；Equal thickness district B: measure Error is ± 0.015mm；Transition region: error is ± 0.032mm.

Embodiment 2:

The relevant parameter of the system of the present invention is as follows:

Using 450mm tetra-roll reversing roller, hydraulic system pressure is 21MPa, and the inbuilt displacement of hydraulic cylinder passes Sensor range is 100mm, and resolution is 0.001mm.

Supplied materials situation: steel grade is DP590, width 400mm, thickness 3.0mm.

Product size: equal thickness district A: thick 1.5mm, long 400mm；Equal thickness district B: thick 2.8mm, Long 300mm；Equal thickness district C: thick 1.8mm, long 200mm；AB transition region: long 130mm, BC Transition region: long 100mm.

Mill speed sets: 0.3m/s.

Thickness hard measurement precision: equal thickness district A: measurement error is ± 0.012mm；Equal thickness district B: measure Error is ± 0.018mm；Equal thickness district C: measurement error is ± 0.013mm；AB transition region: error is ±0.035mm；BC transition region: error is ± 0.033mm.

Claims (3)

1. the soft measurement method of thickness in a periodicity thickness changing strip rolling process, it is characterised in that include with Lower step:

Several equal thickness district and transition regions of band are divided according to exit thickness；

Measure band linear velocity v at inlet of rolling mill_inLinear velocity v with milling train outlet_out；

Calculate supplied materials length L_inWith outlet length L_out；

Equity caliper zones thickness h_cWith transition region thickness h_tCarry out hard measurement；

Described equal thickness district thickness h_cFlexible measurement method in the n moment is:

$h_c\left(n\right)=H_{in}\·\frac{L_{in}\left(n\right)}{L_{out}\left(n\right)\·(1+a)}$

Wherein, a is thickness correction factor, H_inFor inputting supplied materials thickness, for fixed value, L_inN () is the n moment Supplied materials length, L_outN () is the outlet length in n moment；

Described transition region thickness h_tThe n moment flexible measurement method be:

$h_t\left(n\right)=H_{in}\·\frac{v_{in}\left(n\right)}{v_{out}\left(n\right)\·(1+a)}$

Wherein, a is thickness correction factor, H_inFor inputting supplied materials thickness, for fixed value, v_inN () is the n moment Band is at the linear velocity of inlet of rolling mill, v_outN () is the linear velocity that n moment band exports at milling train.

Soft measurement method of thickness in periodicity thickness changing strip rolling process the most according to claim 1, its Being characterised by, described band is in linear velocity v of inlet of rolling mill_inLinear velocity v with milling train outlet_outMeasuring method For:

Measure inlet of rolling mill and the rotating speed of outlet measuring roller: install at entrance and exit measuring roller axle head respectively and compile Code device, signal accesses computer control system, measures the rotating speed N of entrance measuring roller_inWith outlet measuring roller Rotating speed N_out；

Calculate linear velocity v of inlet of rolling mill_inV with milling train outlet_out, it is calculated as follows:

$v_{in}=\mathrm{\π}\·\frac{N_{in}\·D_{in}}{60}$

$v_{out}=\mathrm{\π}\·\frac{N_{out}\·D_{out}}{60}$

Wherein, D_inFor entrance measuring roller diameter, D_outFor outlet measuring roller diameter.

Soft measurement method of thickness in periodicity thickness changing strip rolling process the most according to claim 1, its It is characterised by, described supplied materials length L_inWith outlet length L_outComputational methods be:

$L_{in}\left(n\right)=\underset{i=1}{\overset{n}{\Σ}}{v}_{in}\left(i\right)\·T_C$

$L_{out}\left(n\right)=\underset{i=1}{\overset{n}{\Σ}}{v}_{out}\left(i\right)\·T_C$

Wherein L_inN () is L_inAt the value of calculation in n moment, L_outN () is L_outAt the value of calculation in n moment, T_CFor The computer control system sampling time.