CN102717044B - Method for controlling nail shooting process of continuous casting slab - Google Patents

Abstract

The invention provides a method for controlling a nail shooting process of a continuous casting slab. The method comprises the following steps: 1) determining a nail shooting position and fixing a nail shooting gun on the nail shooting position; 2) measuring a distance L0 from the nail shooting position to an initial point where a casting slab is cut; 3) collecting relative technological parameters of a casting machine including a casting speed V, a cutting fixed length l0, a cutting slit l1 and a cutting balance l2; 4) calculating and determining a nail shooting time through formula (1) and formula (2); 5) calculating a time t needed by the casting slab where shooting nail is for getting to a zero cutting position through formula (3); 6) calculating a cutting length l3 of a nail shooting slab sample through formula (4); 7) and shooting nails when a cutting machine have passed a distance of [delta]L from the zero cutting point, and then cutting the nail shooting slab sample according to the length 13 when the time reaches t. The method in the invention is simple and easy to operate, a fixed length position where a casting slab of continuous casting nail shooting is cut in a process of measuring a slab shell can be accurately determined, waste generated from a short length of the casting slab can be effectively avoided, and problems of poor accuracy and danger existence from manual marking of the nail shooting position can be overcome.

Description

A kind of continuous casting billet nailing course control method for use

Technical field

The invention belongs to continuous casting technology field in STEELMAKING PRODUCTION, particularly continuous casting billet list rifle nailing (or horizontal multiple gun nailing simultaneously) is measured the control method of process.

Background technology

A lot of smelters, by the experimental study of the shell thickness variation of actual measurement casting blank solidification shell thickness, particularly process of setting, carry out the combination property of system evaluation casting machine, casting steel grade, technique etc.Strand thickness measurement technology has successively developed the methods such as bleed-out method, isotopic tracer method, electromagnetic ultrasonic wave method, method of powder actuated shot, Method for Numerical, but current generally use is method of powder actuated shot.

Use method of powder actuated shot can more accurately learn the variation of continuous casting and solidifying shell thickness, the steel mill of lot of domestic and international enterprise is tested casting blank solidification shell thickness by method of powder actuated shot, but in the time using method of powder actuated shot test shell thickness, all there is nailing procedure parameter control problem.If nailing is held improper meeting and cause the short chi of nailing base sample place strand opportunity, or can not find the strand position at nailing place after nailing; If may cause danger because of molten steel splash in the artificial nailing position of demarcating when nailing, and there is the shortcoming etc. of low precision.

Summary of the invention

The object of the invention is to overcome the deficiency that above-mentioned prior art exists, provide a kind of by controlling the nailing time, determine the continuous casting billet nailing course control method for use of nailing strand accurate location.The present invention is applicable to single rifle nailing or horizontal (being vertical throwing direction) multiple gun nailing simultaneously of continuous casting billet nailing thickness measuring process.

Continuous casting billet nailing course control method for use of the present invention is achieved in that the method comprises the following steps:

1) determine nailing position, then ail gun is fixed on nailing position;

2) measure the distance L from nailing position (conventionally the front end of a fan-shaped section) to strand cutting initial point ₀(if horizontal multiple gun nailing simultaneously, using outermost nailing position as measuring reference);

3) after casting machine pulling rate is constant, gather relevant casting machine technological parameter, comprising: pulling rate V, cutting scale l ₀, cutting gap l ₁and cutting surplus l ₂;

4) by formula (1) and (2) calculative determination nailing moment:

$n=\left|\frac{L_0}{l_0}\right|+1---\left(1\right)$

Wherein n is integer, after rounding calculating, draws;

Δ L ＝ n(l ₀+l ₁)+l ₂-l ₀ (0≤△L<L0)(2)

L2, L0, △ L, l0 and l1 unit are m;

5) calculate nailing place strand by formula (3) and arrive the cutting time t at zero point:

$t=\frac{L_0-l_2}{V}---\left(3\right)$

6) calculate cutting nailing base sample length l by formula (4) ₃:

l ₃＝2l ₂ (4)

(l conventionally ₂get 0.1～0.15m)

7) etc. cutting machine from cutting pass by zero point △ L long apart from time the nailing of shooting, the time of advent, t was by length l ₃cutting nailing base sample.

The inventive method is simple, multiple steel grades of producing for conticasters such as sheet slab, blooms carry out nailing test, can accurately determine that the strand that continuous casting nailing is measured in base shell process cuts scale position, the waste of effectively having avoided the short chi of strand to cause, poor accuracy and dangerous problem while also having overcome artificial demarcation nailing position simultaneously.

Detailed description of the invention

Below by embodiment, the present invention is further illustrated.

Carry out nailing mensuration thickness of solidified slab shell in secondary in continuous casting is produced time, use this nailing control method.Before nailing, the nailing relevant parameter collecting is updated to correlation formula, after calculating, obtains the time of nailing moment, nailing strand arrival cut point.

The relevant parameter of casting machine: pulling rate V=1m/min, nailing are put the distance L of cutting machine initial point ₀=26.7m, strand cutting scale l ₀=7m, cutting gap l ₁the cutting surplus l of=0.01m and nailing base sample ₂=0.15m.After substitution parameter, calculate:

(1) determine the nailing moment

ΔL＝4×(7+0.01)+0.15-26.7＝1.49m

Cutting machine from cutting pass by zero point 1.49m long apart from time the nailing of shooting immediately;

(2) nailing place strand arrives the cutting time at zero point

$t=\frac{26.7-0.15}{1}=26.55\min$

After nailing, start timing, the time that nailing place strand arrives cut point is 26.55min;

(3)l ₃＝2×0.15＝0.3m

Nailing base sample Cutting Length: 0.3m.

Claims (1)

1. a continuous casting billet nailing course control method for use, is characterized in that comprising the following steps:

1) determine nailing position, and ail gun is installed;

2) distance L of measurement nailing positional distance strand cutting initial point position ₀;

3) gather following casting machine technological parameter: pulling rate V, cutting scale l ₀, cutting gap l ₁and cutting surplus l ₂;

4) by formula (1) and (2) calculative determination nailing moment:

$n=\left|\frac{L_0}{l_0}\right|+1---\left(1\right)$

Wherein n is integer, after rounding calculating, draws;

ΔL＝n(l ₀+l ₁)+l ₂-l ₀(0≤△L<L ₀) (2)

L ₂, L ₀, △ L, l ₀and l ₁unit is m;

5) calculate nailing place strand by formula (3) and arrive the cutting time t at zero point:

$t=\frac{L_0-l_2}{V}---\left(3\right)$

6) calculate cutting nailing base sample length l by formula (4) ₃:

l ₃＝2l ₂ (4)

7) etc. cutting machine from cutting pass by zero point △ L long apart from time the nailing of shooting, the time of advent, t was by length l ₃cutting nailing base sample.