CN103230941B - Chamfering blank width control method - Google Patents

Abstract

The invention provides a chamfering blank width control method which includes calculating widths of chamfering blanks of various specifications and conducting regression analysis on the rolling actual performance to obtain a function relation delta W between the actual performance width of the chamfering blanks, the size of plate blank supplied materials and the size of middle blanks. Delta W= F(W1, H1, W2 and H2), (wherein delta W is the width deviation value of the middle blanks produced by the normal plate blanks and the chamfering blanks, W1 is the width of the plate blanks, H1 is the thickness of the plate blanks, and W2 and H2 are the width and the thickness of the middle blanks respectively). The deviation value in the chamfering blank rolling can be obtained through the function and is utilized to compensate the target size of the middle blanks, namely, the target size of the middle blanks of the chamfering plate blanks is W2+ delta W when the target size is W2, and effects of the size of the chamfering blanks are removed.

Description

A kind of chamfering base width control method

Technical field

The present invention relates to chamfering base width control system technology, especially to the differentiation increasing chamfering base and normal slab, and target width is compensated, improve the method for its setting accuracy.

Background technology

Domestic hot rolling mill for slab defect adopt have peeling, method for cutting edge more, to change to width of plate slab like this, new width of plate slab is used to carry out calculating and self study can not have an impact, also part producer is had to adopt the mode of chamfering to eliminate slab defect, this mode can reduce supplied materials loss, but the width of slab does not change, but the amount of metal of reality there occurs change, how to ensure in this case and calculate accuracy, improving width control system ability is a comprehensive problem.

What the present invention used the supplied materials of hot rolling is exactly that the mode of chamfering is to eliminate slab defect, but not all slab all carries out chamfering, just chamfering is carried out to defect slab, so just cause the mixed rolling of chamfering base and normal panel, as why not caused it to influence each other, have higher requirement to model, this is also the object that is achieved of this method and innovation.

Summary of the invention

The object of the invention is to: chamfering base width control method, adds the differentiation of chamfering base and normal slab, and compensate target width, improve setting accuracy, width is blocked and is reduced to less than 0.6%.

The object of the present invention is achieved like this: a kind of chamfering base width control method, for semi-tandem rolling and hot rolling production line, in heating furnace L2 picture, arranges interface identification, distinguish normal slab and chamfering base;

Step 1 utilizes regression function: Δ W=F (W1, H1, W2, H2), calculates deviation and is revised intermediate blank target, obtains new intermediate blank target width W '=W2+ Δ W; Wherein Δ W is the width difference value of the intermediate blank that normal slab and chamfering base are produced, and W1 is width of plate slab, and H1 is slab thickness, and W2, H2 are respectively width, the thickness of intermediate blank;

It is other that step 2 sets corresponding layer in roughing model, when the first passes, adds heavy reduction and lateral pressure amount, eliminates the metal flow difference of chamfering base in front passage;

step 3, according to the chamfering blank mark of furnace setpoint, determines whether chamfering, if it is uses corresponding chamfering base target size and setting to be rolled, and avoids influencing each other of chamfering base and normal slab.

Described control method, effectively can reduce the impact of chamfering slab on finished width size.

Know-why of the present invention: rolled piece spreads point two classes in the operation of rolling: one is the natural width spread of rolled piece when only using flat rolling, a kind of " dog bone " shape first producing edge projection through edge rolling, then " dog bone " shape generating portion exhibition of returning (as Fig. 2) after flat rolling again, and when the rolling of chamfering base, because four angles of slab are all cut, and the size of slab situation difference excision is also different, general excision is the angle of 45*35mm, amount of metal excised like this is larger, when being rolled slab, edger roll carries out side pressure and cannot produce " dog bone " normally, like this when plain-barreled roll is depressed, also normal width Hui Zhanliang cannot just be ensured, the width extent causing calculating by normal model just cannot be ensured width of plate slab when being rolled chamfering slab by this.

The present invention is by being distinguished different slab supplied materials situation, and regression analysis is carried out to the actual achievement of chamfering base, draw the width difference function of the chamfering base of different size, thus different setting strategies is used to different chamfering bases, make setting more accurate, and to self study also layering in addition, when ensureing chamfering base and normal base mixed rolling, do not cause and influence each other, ensure effective raising of the in order normal and product quality of producing, demonstration has been made in technological innovation for enterprise, shows technological progress.

Accompanying drawing explanation

The present invention is described further by reference to the accompanying drawings.

Accompanying drawing 1 is slab " dog bone " schematic shapes after slab side pressure;

As shown in the figure: 1-dotted line is slab original shape; 2-solid line is blank shape after side pressure.

Accompanying drawing 2 is that the slab after slab plain-barreled roll pressure spreads schematic shapes;

As shown in the figure: 2-dotted line is the blank shape before pressure; 3-spreads for pressing down; 4-is natural width spread.

Detailed description of the invention

The present invention is described further in conjunction with the embodiments.

Embodiment

1) in heating furnace L2 picture, add an input interface, operative employee enters stokehold at slab and slab can be labelled, thus normal slab and chamfering base is distinguished;

2) chamfering base is utilized to the function Δ W=F (W1 returned out, H1, W2, H2), (wherein Δ W is the width difference value of the intermediate blank that normal slab and chamfering base are produced, and W1 is width of plate slab, H1 is slab thickness, W2, H2 are respectively width, the thickness of intermediate blank), utilize the deviation calculated to be revised intermediate blank target, obtain new intermediate blank target width W '=W2+ Δ W;

3) in roughing model respective settings Policy Table, corresponding layer is increased other, the strategy of chamfering slab and normal slab and self study are all distinguished, different in rolling strategy for chamfering base, when the first passes, consciously add heavy reduction and lateral pressure amount, thus the metal flow difference of chamfering base is eliminated in front passage; For model side pressure Policy Table, corresponding strategy is added in Policy Table, in order to easy to adjust, former strategy is not had an impact, the strategy of correspondence number is added the control strategy number of the new chamfering base of 500 generations, and corresponding strategy is adjusted, as first passage lateral pressure amount is strengthened, non-passage correction factor the mode such as to turn down to guarantee that the impact of chamfering slab is eliminated by first passage, and all the other rolling strategies and self-learning strategy therewith principle are identical, see the following form.

Table model side pressure strategy

Strategy number	Width of plate slab	Subtract wide amount	Final thickness	Tapping mark	Maximum lateral pressure amount	The maximum lateral pressure amount of first passage	Non-passage Manual Logos	Non-passage correction factor
									1	930	-20	21	Q235B	52.00	48.00	1	0.25
1	930	-10	21	Q235B	52.00	48.00	1	0.25
									1	930	0	21	Q235B	52.00	48.00	1	0.25
1	930	10	21	Q235B	50.00	48.00	1	0.25
									1	930	20	21	Q235B	50.00	48.00	1	0.25
1	930	30	21	Q235B	50.00	48.00	1	0.25
									1	930	80	21	Q235B	50.00	48.00	1	0.25
									501	930	-20	21	Q235B	52.00	52.00	1	0.23
501	930	-10	21	Q235B	52.00	52.00	1	0.23
									501	930	0	21	Q235B	52.00	52.00	1	0.23
501	930	10	21	Q235B	50.00	52.00	1	0.23
									501	930	20	21	Q235B	50.00	52.00	1	0.23
501	930	30	21	Q235B	50.00	52.00	1	0.23
									501	930	80	21	Q235B	50.00	52.00	1	0.23

4) when being rolled, chamfering blank mark according to furnace setpoint carries out determining whether chamfering, if it is corresponding chamfering base target size and setting strategy is used to be rolled, as shown above, chamfering base then uses strategy 501, as normal slab then uses strategy 1, and after rolling completes, use chamfering base self study layer not carry out self study, avoid influencing each other between chamfering base and normal slab.

Claims (2)

1. a chamfering base width control method, is characterized in that: in semi-tandem rolling and hot rolling production line, interface identification is set in heating furnace L2 picture, distinguishes normal slab and chamfering base;

Step 1 utilizes regression function: Δ W=F (W1, H1, W2, H2), calculates deviation and is revised intermediate blank target, obtains new intermediate blank target width W '=W2+ Δ W; Wherein Δ W is the width difference value of the intermediate blank that normal slab and chamfering base are produced, and W1 is width of plate slab, and H1 is slab thickness, and W2, H2 are respectively width, the thickness of intermediate blank;

It is other that step 2 sets corresponding layer in roughing model, when the first passes, adds heavy reduction and lateral pressure amount, the metal flow difference of chamfering base eliminated in the first passage;

Step 3, according to the chamfering blank mark of furnace setpoint, determines whether chamfering, if it is uses corresponding chamfering base target size and setting to be rolled, and avoids influencing each other of chamfering base and normal slab.

2., according to method described in claim 1, it is characterized in that: the method effectively reduces chamfering baseon the impact of finished width size.