CN1709639A - Hot-rolled finished product small steel rod surface ear defect removing method - Google Patents
Hot-rolled finished product small steel rod surface ear defect removing method Download PDFInfo
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- CN1709639A CN1709639A CN 200510027395 CN200510027395A CN1709639A CN 1709639 A CN1709639 A CN 1709639A CN 200510027395 CN200510027395 CN 200510027395 CN 200510027395 A CN200510027395 A CN 200510027395A CN 1709639 A CN1709639 A CN 1709639A
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Abstract
The invention is the elimination method for hot-roll small round steel surface ear objection. Its characteristic is that it adopts the three-step technics of correcting direct two-time and skiving on the grinding machine to the ear objection of the small round steel. Firstly, the correcting direct makes the ear form the man-made flathening which leans to one side. The outline is that the roller line of the correcting machine equals D+0.5*H(D is the nominal dimension of the small round steel's positive tolerance or the practical dimension of the negative tolerance, H is two times of the raised thickness of the unilateral ear or the smaller one of the double-faced ears) and the speed of the correcting direct is 0.25m/s and the circumgyrated angle is following the beaten track. Secondly, the second correction peels off the man-made flathening in the first time. The outline is correcting direct reversly. The third step is the one-off skiving of the grinding wheel non-core grinding machine. The outline is that the rotate speed of the wheel is 40 turns/min and the bosseyed width of the max grinding is 0.25mm and the entering number of the wooden material is 50mm/s.The invention is provided with the original and logical technics and the strong maneuverability. It solves the question that the difficult disposal of the hot-roll small round steel surface ear objection. It possesses the high efficiency of production, the low cost and the eligibility ratio of production reaches to 100%.
Description
Technical field
The present invention relates to the removing method of metallurgy industry hot rolled circular steel (bar) blemish, refer in particular to the removing method of low medium carbon structure steel, the little round steel of low-alloy structural steel hot rolling (bar) blemish.
Background technology
Structural steel is common iron and steel kind, and structural steel mainly can be divided into structural carbon steel, structural alloy steel two big classes.Press the difference of carbon content in the steel, structural carbon steel can be divided into low carbon-structural steel, medium carbon structure steel, structural carbon steel; Press the difference of alloy content, structural alloy steel can be divided into low-alloy structural steel, high alloy-structural steel etc.Press the Shape Classification of iron and steel finished product, steel product can be divided into round steel (bar), band, silk, pipe, sheet material and shaped piece.Press the moulding process of iron and steel finished product, can be divided into hot-strip, cold rolling steel, forging.
Structural steel hot rolled circular steel (bar) is common steel products.Low medium carbon structure steel, (diameter is Φ 8mm～Φ 20mm to low-alloy structural steel small dimension hot rolling vertical bar round steel, and user's cut lengths is 6000mm or 7000mm substantially.) when producing, ears or side handles of a utensil defective often takes place, and (a kind of mistake because of the rolling mill pass is full of the round steel blemish that produces, and be inevitable in the round steel hot rolling production process.The feature of ears or side handles of a utensil defective is: in the hot rolling production process, when steel billet passes the pass of adjacent two rolls formation of same rolling mill, protrude along roll gap gap direction single or double, ridge is strip, the elongated one or both sides that appear at the vertical bar round steel, elongated length L are less than the cut lengths of vertical bar round steel, the generally about 0.20mm of ridge projection thickness H, width B is suitable with the roll gap gap, scarcely surpasses 3mm).
At present, the common methods of eliminating small dimension hot rolled circular steel ears or side handles of a utensil defective has two kinds, and (specification can't be eliminated less than the small dimension hot rolled circular steel of≤Φ 14mm, is generally all scrapped processing to be subjected to the specification limits of hot rolled circular steel.This be because: repair stand mill at mill and repair, when the wide emery wheel of portable abrasive machine 20mm contacts with round steel when stressed, the easy sag bent of little round steel, emery wheel is difficult to find accurately defective; Particularly length is greater than the hot rolled circular steel of 6000mm, guarantee along its length that ears or side handles of a utensil defective is ground fully to be difficult to clearly accomplish; Often defective does not grind off, and right rail is ground off one by emery wheel, causes the local defective of round steel external form or size.): (1) grinds off the ears or side handles of a utensil (being applicable to the small dimension hot rolled circular steel of specification 〉=Φ 16mm) with portable abrasive machine, and it belongs to manual mill and repaiies method, yields poorly, and labour intensity is big, and condition of work is abominable, generally uses in ears or side handles of a utensil defects count more after a little while; (2) grind the removal ears or side handles of a utensil (being applicable to the small dimension hot rolled rod of specification 〉=Φ 14mm) with the emery wheel coreless grinding machine, can improve working condition, it adopts the method along circumference mechanical lapping, (ears or side handles of a utensil defective causes the round steel corner angle for multi-pass, little stock removal, Even Grinding, make the round steel ovality seriously offscale, cause the actual grinding inhomogeneities of corase grind.), eliminate the ears or side handles of a utensil defective about 0.20mm: when grinding machine was roughly ground in first road, the diameter stock removal was 0.15mm, promptly the 0.07mm of round steel single face is (to slow down the mechanical grinding vibrations that the round steel out-of-roundness is brought.); Then carry out the second road reconditioning, the diameter stock removal is bigger, is 0.30mm; Finish grind at last (on the one hand, because it is many that mill is repaiied the operation passage, be subjected to the influence of factors such as rolling temperature, electric and rolling tensile force again because of defective, the ears or side handles of a utensil are uneven along the height or the thickness of round steel length direction, so when ears or side handles of a utensil defective was thoroughly eliminated, often oneself exceeded the permissible variation limit to the round steel size; On the other hand,, the machinery mill makes that roundlet steel surface quality is bright and clean though repairing, the multi-pass grinding, and the production cost height, production efficiency is low; From the economic angle analysis, it is to lose more than gain that the machinery mill is repaiied small dimension vertical bar round steel.)。
In addition, technological measure from pure technology, mechanical car's cutting method that indivedual enterprises adopt, can eliminate the ears or side handles of a utensil defective of (solution) hot rolled circular steel preferably, but there is the deficiency that the machining metal loss is big, production cost is high in this technology, the blemish that is used for the high added value ferrous materials is handled low medium carbon structure steel, low-alloy structural steel material that improper added value is relatively low more.
In sum, the ears or side handles of a utensil defective of small dimension hot rolling vertical bar round steel, if not must finish the supply contract amount, the countermeasure that Metallurgical Factory takes can only be to scrap that (when ears or side handles of a utensil faulty goods quantity was big, the mass loss of scrapping was repaiied with mill and compared, and still scrapped economically.)。
Summary of the invention
The present invention develops a kind of removing method of hot rolling small steel rod surface ear defect, utilize medium and small multiple roll cross roll formula straightener (straightener is the special mechanical equipment that is used for the round steel bending defect), the secondary aligning has the little round steel of hot rolling of ears or side handles of a utensil defective and (aligns for the first time, the round steel rod surface ear is flattened through aligning all form the artificial calendering of being partial to one side; Aligning is peeled off and is aligned the artificial calendering that forms for the first time for the second time, significantly reduces the quantity of ears or side handles of a utensil defective.Reach simplify the low medium carbon structure steel of hot rolling, low-alloy structural steel roundlet rod iron ears or side handles of a utensil defective machinery mill is repaiied operation), again through emery wheel coreless grinding machine grinding technique, the disposable ears or side handles of a utensil blemish that grinds off the little round steel of hot rolling.Solved the handling problem of low medium carbon structure steel, low-alloy structural steel hot rolling roundlet steel ears or side handles of a utensil defective, production efficiency height, product qualification rate reaching 100%.Satisfied the ordinary production requirement that steelmaker (steel plant) hangs down medium carbon structure steel, the little round steel of low-alloy structural steel hot rolling.
The removing method of the hot rolling small steel rod surface ear defect of the present invention's exploitation, it is characterized in that: adopt three-steps process, by in, small-sized multiple roll cross roll formula straightener carries out the secondary aligning to the little round steel of the hot rolling with ears or side handles of a utensil defective, and subsequent emery wheel coreless grinding machine milled processed, remove low medium carbon structure steel, (elongated or discontinuity mixes the strip metal ridge that appears at vertical bar round steel one or both sides to the ears or side handles of a utensil blemish of the little round steel of low-alloy structural steel hot rolling, projection thickness H=0.05～0.25mm, width B=0.5～3.0mm, length H=100～7000mm), obtain smooth surface, the finished product small steel of size conforms specification requirement:
The first step, (multiple roll cross roll formula straightener is used as the alignment operation of vertical bar round steel bending defect usually to adopt medium and small multiple roll cross roll formula straightener.Routine operation is: rectify the product actual size according to waiting, carry out roll gap and anglec of rotation adjustment; Aligning speed 0.5m/s; Minimum aligning specification Φ 12mm; Aligning back precision f≤1 ‰.) the little round steel of the hot rolling with ears or side handles of a utensil defective is carried out the aligning first time, make the round steel rod surface ear flatten the artificial calendering that all forms the deflection one side through aligning, main points are:
(1) anglec of rotation adjustment: do not consider the influence of the ears or side handles of a utensil (the single or double ears or side handles of a utensil) projection thickness,, press the straightener common process and adjust the anglec of rotation only according to the actual diameter of little round steel;
(2) the straightener roll gap is adjusted, and just the metal drafts is adjusted:
(A) for two-sided ears or side handles of a utensil defective: when the actual size of little round steel is plus tolerance, roll gap=D nominal+(0.8～1.4) * H1; When the actual size of little round steel is negative common difference, roll gap=D reality+(0.8～1.4) * H1; The D nominal is the round steel nominal diameter, and D is actual to be the round steel actual diameter, and H1 is the less projection thickness of the two-sided ears or side handles of a utensil (2 ears or side handles of a utensil);
(B) for single face ears or side handles of a utensil defective: when the actual size of little round steel is plus tolerance, roll gap=D nominal+(0.3～0.7) * H2; When the actual size of little round steel is negative common difference, roll gap=D reality ++ (0.3～0.7) * H2; H2 is the projection thickness of the single face ears or side handles of a utensil (1 ears or side handles of a utensil);
(3) aligning speed is that 0.20～0.35m/s carries out straightening operation (full speed aligning, that is to say when aligning speed is 0.5m/s, the hot rolling roundlet steel that can produce following problem: A, has ears or side handles of a utensil defective is along circumferential protrusion, and roundlet steel surface, aligning back forms the gap between screw ears or side handles of a utensil and ears or side handles of a utensil aligning flattens the calendering that forms; B, make the aligning shake along the metal of hot rolling roundlet steel circumferential protrusion, aligning discontinuity and cause the arch steel causes and causes the scale defective by aligning back round steel contraction in length; C, aligning back glacing flatness do not reach specification requirement.The deceleration of aligning is aligned relatively at full speed, and aligning speed is less, is 0.20～0.35m/s only, and as 0.25m/s, remarkable to advising round ovality effect, the round steel ovality is obviously improved; And round steel is rectified the back glacing flatness and is reached specification requirement substantially.)。The aligning shake is little relatively at full speed for low speed aligning, and straightening force is even, can make full use of cross roll section straightener rule circle, the alignment function is forced the rule circle to the defective round steel; Simultaneously, force ears or side handles of a utensil defective secundly, form artificial calendering (having avoided aligning at full speed the calendering that the ears or side handles of a utensil aligning that brings the helical form gap ears or side handles of a utensil and incomplete aligning thereof to cause flattens formation).
Second step, adopt medium and small multiple roll cross roll formula straightener that the little round steel of hot rolling is carried out the aligning second time, peel off the artificial calendering (deflection one side) of aligning formation for the first time, make little round steel only deposit indivedual defectives (obviously alleviating the ears or side handles of a utensil defective of round steel) with single or double ears or side handles of a utensil defective, and improve the out-of-roundness (creating conditions for the disposable grinding of next step emery wheel coreless grinding machine) of round steel, main points are:
(1) the little round steel of hot rolling is oppositely aligned, be that is to say, the round steel head of aligning is the round steel afterbody of aligning for the second time for the first time; Can round steel have been transferred the operation that commutates with overhead traveling crane, the afterbody of once aligning has been adjusted to the head of secondary aligning;
(2) the straightener anglec of rotation, roll gap adjustment and aligning speed are identical with the technological parameter of aligning for the first time.Effect is: 1, reverse end for end to nip (rightabout) forced the once artificial calendering that forms to dig, and causes defective to peel off; The defective stubble that does not dig up the roots is pressed on one side by the smart section working roll of rectifying of straightener; Reach the effect of the artificial calendering in place to go.2, rule are round once more, reduce out-of-roundness.3, the lax arch steel phenomenon of bringing of once aligning has discharged because of once aligning the length that the arch steel shortens, and has solved and has once aligned the problem that shortens length.
The 3rd step, adopt the emery wheel coreless grinding machine that the round steel of secondary aligning is carried out disposable grinding (before not adopting the secondary method for aligning, original production process is " once+three grindings of aligning ": after once aligning, grinding for the first time forms the helical form gap ears or side handles of a utensil and the ears or side handles of a utensil and is aligned the calendering of flattening formation and cause grinding face to be uneven, the grinding imbalance because of flexibility and out-of-roundness reach the bar surface greatly through aligning after.Process stipulation single face stock removal≤0.15mm; Stock removal process stipulation single face≤0.25mm has eliminated ears or side handles of a utensil defective substantially for the second time, and feel has the out-of-roundness corner angle to exist, but actual size is qualified.Finish grind diameter grinding and feeding amount≤0.15mm for the third time.After grinding process was finished, the pole cut lengths differed, and short material reaches about 25%.), obtaining the finished product small steel of smooth surface, size conforms specification requirement, main points are:
(1) emery wheel coreless grinding machine emery wheel rotating speed 30～40 commentaries on classics/min;
(2) every time maximum stock removal single face≤0.25mm is (under the situation that does not change the equipment parameter, because of divested the protruding metal on pole surface substantially through the secondary aligning, the out-of-roundness remarkable improvement, glacing flatness reaches specification requirement, and balanced grinding requirement has been satisfied on the pole surface.So stock removal can once reach single face 0.25mm.The pole surface reaches the correct grinding level after the grinding of width 300mm wheel face, and out-of-roundness does not have feel.Mill back length is all qualified.Reached the shortening production cycle, the simple and direct mill that reduces production costs is repaiied purpose.)；
(3) bar allows flexibility≤2.5mm/m;
(4) the bar amount of feeding 45～60mm/s.
Compare with prior art, the present invention has following advantage:
1, technology novelty, reasonable;
2, on-the-spot workable;
3, solved the ears or side handles of a utensil defective of low medium carbon structure steel, the little round steel of low-alloy structural steel hot rolling, the technical barrier of industrially scalable difficult treatment;
4, product percent of pass height;
5, production cost is low, the production efficiency height.
Specific embodiments
Certain steel rolling subsidiary factory of iron company implements patent of the present invention, adopt three-steps process (the secondary aligning adds emery wheel coreless grinding machine milled processed No. a time), eliminate the ears or side handles of a utensil defective of low medium carbon structure steel, the little round steel of low-alloy structural steel hot rolling: (case 1) medium carbon structure steel S45C steel, round steel nominal diameter Φ 20mm, scale 6000mm, the defective work of 6 tons of two-sided ears or side handles of a utensil defectives; (case 2) low carbon-structural steel SWRCH10A steel, round steel nominal diameter Φ 12mm, 15 tons of single faces, two-sided and discontinuity mix the defective work of ears or side handles of a utensil defective, scale 7000mm, about ears or side handles of a utensil defective thickness 0.20mm, peak 0.25mm; (case 3) low-alloy structural steel 12Cr1MoV steel, round steel nominal diameter Φ 16mm, scale 6000mm, the defective work of 9 tons of two-sided ears or side handles of a utensil defectives.
The first step, adopt 10 roller cross roll formula section straighteners (medium and small multiple roll cross roll formula section straightener) that the little round steel of the hot rolling with ears or side handles of a utensil defective is carried out the aligning first time, make the round steel rod surface ear flatten the artificial calendering that all forms the deflection one side through aligning, main points are:
(1) anglec of rotation adjustment: do not consider the influence of the ears or side handles of a utensil (the single or double ears or side handles of a utensil) projection thickness,, press the straightener common process and adjust the anglec of rotation only according to the actual diameter of little round steel;
(2) the straightener roll gap is adjusted, and just the metal drafts is adjusted:
(A) for two-sided ears or side handles of a utensil defective: when the actual size of little round steel is plus tolerance, roll gap=D nominal+(0.8～1.4) * H1=D nominal+H1; When the actual size of little round steel is negative common difference, roll gap=D reality+(0.8～1.4) * H1=D reality+H1;
(B) for single face ears or side handles of a utensil defective: when the actual size of little round steel is plus tolerance, roll gap=D nominal+(0.3～0.7) * H2=D nominal+0.5 * H2; When the actual size of little round steel is negative common difference, roll gap=D reality+(0.3～0.7) * H2=D reality+0.5 * H2;
(3) aligning speed is that 0.20～0.35m/s=0.25～0.30m/s carries out straightening operation (the aligning shake is little relatively at full speed for low speed aligning, and straightening force is even, can make full use of cross roll section straightener rule circle, the alignment function is forced the rule circle to the defective round steel; Simultaneously, force ears or side handles of a utensil defective secundly, form artificially calendering.Having avoided at full speed, aligning brings the helical form gap ears or side handles of a utensil and not exclusively aligns the ears or side handles of a utensil aligning that causes and flatten the calendering that forms);
(4) aligning back effect: with case 1 is the S45C steel of example: diameter of phi 20mm, ears or side handles of a utensil defective all is partial to the smoothing roll direction of rotation, form calendering, out-of-roundness is the 0.30mm of nominal diameter, glacing flatness 1.5～2.5mm/m does not wait, feel has slight wave sense along its length, and the length actual measurement is 5963mm.
Second step, adopt 10 roller cross roll formula section straighteners that the little round steel of hot rolling is carried out the aligning second time, peel off the artificial calendering of aligning formation for the first time, make little round steel only deposit indivedual defectives (obviously alleviating the ears or side handles of a utensil defective of round steel) with single or double ears or side handles of a utensil defective, and improve the out-of-roundness of round steel, main points are:
(1) the little round steel of hot rolling is oppositely aligned, be that is to say, the round steel head of aligning is the round steel afterbody of aligning for the second time for the first time; During concrete operations, can round steel have been transferred the operation that commutates, the afterbody of once aligning has been adjusted to the head of secondary aligning with overhead traveling crane;
(2) the straightener anglec of rotation, roll gap adjustment and aligning speed are identical with the technological parameter of aligning for the first time.Effect is: 1, reverse end for end to nip (rightabout) forced the once artificial calendering that forms to dig, and causes defective to peel off; The defective stubble that does not dig up the roots is pressed on one side by the smart section working roll of rectifying of straightener; Reach the effect of the artificial calendering in place to go.2, rule are round once more, reduce out-of-roundness.3, the lax arch steel phenomenon of bringing of once aligning has discharged because of once aligning the length that the arch steel shortens, and has solved and has once aligned the problem that shortens length.
(3) aligning back validity check: with case 1 is the S45C steel of example: diameter of phi 20mm, and the out-of-roundness actual measurement is 0.12mm, in the glacing flatness 1.5mm/m, and the slight corner angle of circumference feel, the length actual measurement is 6009mm.
The 3rd step, adopt emery wheel coreless grinding machine (emery wheel is marked wide 300mm) that the round steel of secondary aligning is carried out disposable grinding, obtain the finished product small steel of smooth surface, size conforms specification requirement, main points are:
(1) emery wheel coreless grinding machine emery wheel rotating speed 30～40 commentaries on classics/min=34 commentaries on classics/min;
(2) every time maximum stock removal single face≤0.25mm;
(3) bar allows flexibility≤2.5mm/m;
(4) the bar amount of feeding 45～60mm/s=50mm/s.
(5) check: with case 1 is the S45C steel of example: diameter of phi 20mm, and through the micrometer actual measurement, the round steel actual size: Φ 19.88mm, the surface reaches the correct grinding requirement, measured length 6012mm.The SWRCH10A steel (diameter of phi 12mm) of case 2, the 12Cr1MoV steel (diameter of phi 16mm) of case 3, round steel surface quality and dimensions all reach standard-required, product percent of pass 100%.
Patent of the present invention has new reasonable, the workable characteristics of technology, has solved the technical barrier of the ears or side handles of a utensil defective industrially scalable difficult treatment of low medium carbon structure steel, the little round steel of low-alloy structural steel hot rolling.Implement patented method of the present invention and eliminate the ears or side handles of a utensil defective of low medium carbon structure steel, the little round steel of low-alloy structural steel hot rolling, the production efficiency height, cost is low, effect is good, simultaneously, and the out-of-roundness of round steel, glacing flatness remarkable improvement, product qualification rate reaching 100%.Satisfied the ordinary production requirement that steelmaker (steel plant) hangs down medium carbon structure steel, the little round steel of low-alloy structural steel hot rolling.
Claims (1)
1, the removing method of hot-rolled finished product small steel rod surface ear defect, it is characterized in that: adopt three-steps process, by medium and small multiple roll cross roll formula straightener the little round steel of the hot rolling with ears or side handles of a utensil defective is carried out the secondary aligning, and subsequent emery wheel coreless grinding machine milled processed, remove the ears or side handles of a utensil blemish of low medium carbon structure steel, the little round steel of low-alloy structural steel hot rolling, obtain the finished product small steel of smooth surface, size conforms specification requirement; Ears or side handles of a utensil blemish is elongated or discontinuity mixes the strip metal ridge that appears at vertical bar round steel one or both sides, projection thickness H=0.05～0.25mm, width B=0.5～3.0mm, length H=100～7000mm;
The first step adopts medium and small multiple roll cross roll formula straightener that the little round steel of the hot rolling with ears or side handles of a utensil defective is carried out the aligning first time, makes the round steel rod surface ear flatten the artificial calendering that all forms the deflection one side through aligning, and main points are:
(1) anglec of rotation adjustment: do not consider the projection thickness influence of the single or double ears or side handles of a utensil,, press the straightener common process and adjust the anglec of rotation only according to the actual diameter of little round steel;
(2) the straightener roll gap is adjusted, and just the metal drafts is adjusted:
(A) for two-sided ears or side handles of a utensil defective: when the actual size of little round steel is plus tolerance, roll gap=D
Nominal+ (0.8～1.4) * H1; When the actual size of little round steel is negative common difference, roll gap=D
Actual+ (0.8～1.4) * H1; D
NominalBe the round steel nominal diameter, D
ActualBe the round steel actual diameter, H1 is the projection thickness of the less ears or side handles of a utensil in the two-sided ears or side handles of a utensil;
(B) for single face ears or side handles of a utensil defective: when the actual size of little round steel is plus tolerance, roll gap=D
Nominal+ (0.3～0.7) * H2; When the actual size of little round steel is negative common difference, roll gap=D
Actual+ (0.3～0.7) * H2; H2 is the projection thickness of the single face ears or side handles of a utensil;
(3) aligning speed is that 0.20～0.35m/s carries out straightening operation; The aligning shake is little relatively at full speed for low speed aligning, and straightening force is even, can make full use of cross roll section straightener rule circle, the alignment function is forced the rule circle to the defective round steel; Simultaneously, force ears or side handles of a utensil defective secundly, form artificially calendering;
Second step, adopt medium and small multiple roll cross roll formula straightener that the little round steel of hot rolling is carried out the aligning second time, peel off aligning artificial calendering that form, the deflection one side for the first time, make little round steel only deposit indivedual defectives with single or double ears or side handles of a utensil defective, and improve the out-of-roundness of round steel, main points are:
(1) the little round steel of hot rolling is oppositely aligned, be that is to say, the round steel head of aligning is the round steel afterbody of aligning for the second time for the first time; Can round steel have been transferred the operation that commutates with overhead traveling crane, the afterbody of once aligning has been adjusted to the head of secondary aligning;
(2) the straightener anglec of rotation, roll gap adjustment and aligning speed are identical with the technological parameter of aligning for the first time;
The 3rd step, adopt the emery wheel coreless grinding machine that the round steel of secondary aligning is carried out disposable grinding, obtain the finished product small steel of smooth surface, size conforms specification requirement, main points are:
(1) emery wheel coreless grinding machine emery wheel rotating speed 30～40 commentaries on classics/min;
(2) every time maximum stock removal single face≤0.25mm;
(3) bar allows flexibility≤2.5mm/m;
(4) the bar amount of feeding 45～60mm/s.
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| CNB2005100273955A CN100372645C (en) | 2005-06-30 | 2005-06-30 | Hot-rolled finished product small steel rod surface ear defect removing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108176717A (en) * | 2017-12-28 | 2018-06-19 | 常熟市龙腾特种钢有限公司 | A kind of hot rolled circular steel Methods of Surface Quality Control |
| CN108296770A (en) * | 2017-10-13 | 2018-07-20 | 浙江金麦特自动化系统有限公司 | A kind of production system and technique of Chair support |
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| JPS60170508A (en) * | 1984-02-15 | 1985-09-04 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for rolling |
| CN2609682Y (en) * | 2003-03-13 | 2004-04-07 | 内蒙古包钢钢联股份有限公司无缝钢管厂 | Two-way head centring machine for pipe blank |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108296770A (en) * | 2017-10-13 | 2018-07-20 | 浙江金麦特自动化系统有限公司 | A kind of production system and technique of Chair support |
| CN108296770B (en) * | 2017-10-13 | 2023-07-18 | 浙江金麦特自动化系统有限公司 | Production system and process of chair support |
| CN108176717A (en) * | 2017-12-28 | 2018-06-19 | 常熟市龙腾特种钢有限公司 | A kind of hot rolled circular steel Methods of Surface Quality Control |
| CN108176717B (en) * | 2017-12-28 | 2019-07-02 | 常熟市龙腾特种钢有限公司 | A kind of hot rolled circular steel Methods of Surface Quality Control |
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