CN101612632B - Method for enhancing dimensional accuracy and surface quality of bearing steel wire rod - Google Patents
Method for enhancing dimensional accuracy and surface quality of bearing steel wire rod Download PDFInfo
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- CN101612632B CN101612632B CN2009100628452A CN200910062845A CN101612632B CN 101612632 B CN101612632 B CN 101612632B CN 2009100628452 A CN2009100628452 A CN 2009100628452A CN 200910062845 A CN200910062845 A CN 200910062845A CN 101612632 B CN101612632 B CN 101612632B
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Abstract
The invention discloses a method for enhancing dimensional accuracy and surface quality of a bearing steel wire rod, comprising the following steps: first heating a bearing steel continuous cast billet, and carrying out crude rolling, intermediate rolling and pre-finish rolling in a high temperature recrystallization zone with temperature being 1030-1130 DEG C; secondly carrying out pre-water cooling treatment on the rolled piece, and finally controlling the temperature of the rolled piece within 900-950 DEG C; then carrying out finish rolling of 4-10 times on the rolled piece, adjusting the hole shape dimension of other round hole type finish roller expect for the last time round hole type finish roller during finish rolling so that the round hole with diameter being theta1 becomes an elliptical hole with the short axis theta2=theta1 and long axis theta3= theta1+0.05-0.30mm, and carrying out finish rolling on the rolled piece; and finally carrying out wind cooling treatment on a scattered roll obtain by finish rolling, controlling the roll collecting temperature of the scattered roll output wind cooling roller channel at 330-450 DEG C, putting in environment air for cooling to normal temperature so as to obtain the high carbon chromium bearing steel hot rolling wire rod. The high carbon chromium bearing steel hot rolling wire rod prepared by using the invention is high in dimension accuracy and good in surface quality.
Description
Technical field
The present invention relates to the production and processing field of steel and wire rod, refer to a kind of method that improves bearing steel wire rod dimensional accuracy and surface quality particularly.
Background technology
The high-carbon-chromium bearing steel wire rod is the important materials that is used to make bearing roller, and the user requires very tight, particularly harsh to wire rod permission diameter deviation and the requirement of wire rod out-of-roundness to bearing steel wire rod dimensional accuracy and the surface quality that Metallurgical Factory produces now.As among national standard " gren rod size, profile, weight and permissible variation " the GB/T 14981-2004 wire rod dimensional accuracy being defined as: Φ 5～10mm wire rod C class precision diameter permissible variation ± 0.15mm, C class precision diameter out-of-roundness≤0.24mm (the tightest requirement), Φ 10.5～15mm wire rod C class precision diameter permissible variation ± 0.20mm, C class precision diameter out-of-roundness≤0.32mm; To being defined as of surface quality: the surface should be smooth, crackle, folding, the ears or side handles of a utensil, stammerer, layering must not be arranged and be mingled with, allow impression and local projection, cut, pitted skin, its degree of depth or height B, the C class precision must not be greater than 0.1mm, and other class precisions must not be greater than 0.2mm.
At present in each smelting iron and steel enterprise, the shared cover rolling groove system of the production of bearing steel and carbon steel, rolling mill practice all adopt first roughing, in roll and pre-finish rolling finish rolling processing again; Roughing, in roll and pre-finish rolling step is handled by the forward part frame group in position in the system, the finishing stand group after the finish rolling operation is leaned on by the position is carried out.Consider the deformation influence of rolled piece different directions when rolling, guarantee that rolling mill practice carries out smoothly, the mm finishing mill unit (what at present enterprise was general is made up of 8 or 10 rolling mills) of carrying out the finish rolling operation all is alternately to be rearranged by oval groove, circular hole milling train, oval groove milling train and circular hole milling train are mutually 90 ° of angles, i.e. the horizontally and vertically alternative of saying usually.Be round in order to ensure the steel that go out machine at last, last rolling mill of mm finishing mill unit is necessary for the circular hole milling train, and second from the bottom is the oval groove milling train, and third from the bottom is the circular hole milling train, alternately arranges successively.Rolled piece dimensional accuracy of products and surface quality mainly are to be controlled by the finishing mill unit.The preparation producer of finishing mill all provides each specification passage of mm finishing mill unit red base size when finishing mill dispatches from the factory, and smelting iron and steel enterprise all abides by this specification table to the adjustment of milling train and adjusts each passage pass size when being rolled.
For example the red base size of each specification passage of 45 ° of high speed no-twist finishing mills of A Xiluo sees Table 1.
Table 1:
But, because carbon content height in the high-carbon-chromium bearing steel, and also contain a certain amount of chromium, the high eutectic carbide of a large amount of hardness is arranged between the dendrite in the strand, thereby this steel is harder than common carbon steel.When high temperature, the bearing steel resistance of deformation is higher by 5～17% than carbon steel, and spread coefficient is about 1.2 times of mild steel.Find that after deliberation because of the bearing steel spread coefficient is big, after the stressed compressing, it is variant to the different directions expansion in the circular hole finishing mill.During rolling bearing steel, rolled piece different directions in the circular hole finishing mill was in and was full of, and underfill in the oval groove finishing mill.(degree of filling δ=b/b
k, described b rolled piece width, b
kPass width, δ＞0.95 o'clock belonged to and to be full of, and δ＜0.87 o'clock belongs to underfill), thereby cause rolled piece a certain direction size super large in circular hole, cause the rolled piece blemish, as crackle, folding, stammerer etc.Therefore each smelting iron and steel enterprise is when using the production rolling groove system rolling bearing steel wire rod of carbon steel, and the wire rod dimensional accuracy of production, surface quality are difficult to guarantee.
Summary of the invention
Purpose of the present invention is exactly that a kind of method that improves bearing steel wire rod dimensional accuracy and surface quality will be provided, and can ensure the rolled piece dimensional accuracy of products and the surface quality of preparation.
For achieving the above object, the present invention adopts the new technology of " finish rolling interference control ", promptly by adjusting the pass size of other circular hole finishing mills except that last passage circular hole finishing mill, make it become oval groove by circular hole, and then shape, the size of control wire rod rolled piece during, thereby improve bearing steel wire rod dimensional accuracy and surface quality by the circular hole milling train.
The concrete technology of the inventive method in turn includes the following steps:
1) at first the bearing steel continuous casting steel billet is carried out heat temperature raising, and 1030～1130 ℃ high temperature recrystallization zone carry out roughing, in roll and pre-finish rolling is handled, make the accumulative total percentage elongation n=65 of rolled piece～120 times;
2) secondly rolled piece is carried out pre-water-cooled and handle, cooling velocity is controlled at 20～40 ℃/s, is controlled at 0.8～2.2s cool time, finally makes the rolled piece temperature be controlled at 900～950 ℃ of scopes;
3) finish rolling of again rolled piece being carried out 4～10 passages is handled, and the pass size of adjusting other circular hole finishing mills except that last passage circular hole finishing mill during finish rolling makes it by diameter of phi
1Circular hole become minor axis Φ
2=Φ
1, major axis Φ
3=Φ
1The elliptical aperture of+0.05～0.30mm;
4) at last rolled piece is carried out air-cooled processing, air-cooled speed is controlled at 2～10 ℃/s, the collection volume temperature that rolled piece goes out air-cooled roller-way is controlled at 330～450 ℃, places surrounding air to be cooled to normal temperature, can make dimensional accuracy height, high carbon chromium bearing steel hot rolling wire rod that surface quality is good.
Further improve, in the described step 3),, adjust the pass size of other circular hole finishing mills except that last passage circular hole finishing mill, make it by diameter of phi at the situation of rolled piece final molding diameter less than 10mm
1Circular hole become minor axis Φ
2=Φ
1, major axis Φ
3=Φ
1The elliptical aperture of+0.05～0.20mm; At the situation of rolled piece final molding diameter more than or equal to 10mm, adjust the pass size of other circular hole finishing mills except that last passage circular hole finishing mill, making it is Φ by diameter
1Circular hole become minor axis Φ
2=Φ
1, major axis Φ
3=Φ
1The elliptical aperture of+0.20～0.30mm.
Further improve, in the described step 3), said major axis Φ
3The major axis that is adjacent the elliptical aperture on the oval groove finishing mill is parallel.
Analysis on action mechanism to technological parameter control in each step of the inventive method is as follows below:
High-carbon-chromium bearing steel is suitably adjusted other circular hole finishing mill pass sizes except that last passage circular hole finishing mill when finish rolling, and making it is Φ by diameter
1Circular hole become minor axis Φ
2=Φ
1, major axis Φ
3Jia Chang elliptical aperture slightly.But major axis Φ
3If adjusting range is too big, the out-of-roundness of rolled piece is difficult to guarantee.So the present invention adjusts the inner circular hole finishing mill pass size of dividing of mm finishing mill unit, making it is Φ by diameter
1Circular hole become minor axis Φ
2=Φ
1, major axis Φ
3=Φ
1The elliptical aperture of+0.20～0.30mm, thus reach control workpiece measurement precision and surface quality, stopped defectives such as crackle, folding, stammerer and produced, make gren rod have good surface quality.The present invention is easy to operate, be easy to control, the raising of high carbon chromium bearing steel hot rolling wire rod dimensional accuracy and surface quality makes in the drawing production process and is not easy brittle failure, can save annealing operation for downstream user, save cost, energy consumption, more can adapt to extensive, requirement of mass production.
The specific embodiment
The present invention is described in further detail below in conjunction with specific embodiment:
Embodiment 1: using 45 ° of high speed no-twist finishing mills of root group (10 frame) preparation final molding diameter that rubs is 14mm specification high carbon chromium bearing steel hot rolling wire rod.
1) at first the bearing steel continuous casting steel billet is carried out heat temperature raising, and 1030 ℃ high temperature recrystallization zone carry out roughing, in roll and pre-finish rolling is handled, the accumulative total percentage elongation n=68.2 that makes rolled piece is doubly;
2) secondly rolled piece is carried out pre-water-cooled and handle, cooling velocity is controlled at 40 ℃/s, is controlled at 0.8s cool time, finally makes the rolled piece temperature be controlled at 900 ℃ of scopes
3) carry out 4 passage finish rolling, the finish rolling start rolling temperature is 900 ℃, adjusts the pass size of mm finishing mill unit the 3rd road milling train reciprocal, makes it by diameter of phi
13Circular hole become minor axis Φ
23=Φ
13, major axis Φ
33=Φ
13The elliptical aperture of+0.25mm; Described major axis Φ
33Parallel with the major axis of elliptical aperture on the oval groove finishing mill of the 2nd passage reciprocal.
4) involve in the sector-style cold treatment to loosing at last, air-cooled speed is controlled at 10 ℃/s, and the collection volume temperature that rolls out air-cooled roller-way of loosing is controlled at 330 ℃, places surrounding air to be cooled to normal temperature.Can make dimensional accuracy height, the good high carbon chromium bearing steel hot rolling wire rod of surface quality.
Embodiment 2: utilization A Xiluo 45 ° of high speed no-twist finishing mills group (10 frame) preparation final molding diameter is a 5.5mm specification high carbon chromium bearing steel hot rolling wire rod.
1) at first the bearing steel continuous casting steel billet is carried out heat temperature raising, and 1130 ℃ high temperature recrystallization zone carry out roughing, in roll and pre-finish rolling is handled, the accumulative total percentage elongation n=100 that makes rolled piece is doubly;
2) secondly rolled piece is carried out pre-water-cooled and handle, cooling velocity is controlled at 20 ℃/s, is controlled at 2.2s cool time, finally makes the rolled piece temperature be controlled at 950 ℃ of scopes
3) carry out 10 passage finish rolling, the finish rolling start rolling temperature is 950 ℃, adjusts the pass size of mm finishing mill unit the 3rd road milling train reciprocal, makes it by diameter of phi
13Circular hole become minor axis Φ
23=Φ
13, major axis Φ
33=Φ
13The elliptical aperture of+0.05mm; Adjust the pass size of mm finishing mill unit the 5th road milling train reciprocal, make it by diameter of phi
15Circular hole become minor axis Φ
25=Φ
15, major axis Φ
35=Φ
15The elliptical aperture of+0.10mm; Adjust the pass size of mm finishing mill unit the 7th road milling train reciprocal, make it by diameter of phi
17Circular hole become minor axis Φ
27=Φ
17, major axis Φ
37=Φ
17The elliptical aperture of+0.12mm; Adjust the pass size of mm finishing mill unit the 9th road milling train reciprocal, make it by diameter of phi
19Circular hole become minor axis Φ
29=Φ
19, major axis Φ
39=Φ
19The elliptical aperture of+0.15mm
4) involve in the sector-style cold treatment to loosing at last, air-cooled speed is controlled at 2 ℃/s, and the collection volume temperature that rolls out air-cooled roller-way of loosing is controlled at 450 ℃, places surrounding air to be cooled to normal temperature.Can make dimensional accuracy height, the good high carbon chromium bearing steel hot rolling wire rod of surface quality.
Embodiment 3: utilization 15 °/75 ° high speed no-twist finishing mill groups of De Make (8 frame) preparation final molding diameter is a 8mm specification high carbon chromium bearing steel hot rolling wire rod.
1) at first the bearing steel continuous casting steel billet is carried out heat temperature raising, and 1100 ℃ high temperature recrystallization zone carry out roughing, in roll and pre-finish rolling is handled, the accumulative total percentage elongation n=110 that makes rolled piece is doubly;
2) secondly rolled piece is carried out pre-water-cooled and handle, cooling velocity is controlled at 25 ℃/s, is controlled at 1.5s cool time, finally makes the rolled piece temperature be controlled at 920 ℃ of scopes;
3) carry out 6 passage finish rolling, the finish rolling start rolling temperature is 920 ℃, adjusts the pass size of mm finishing mill unit the 3rd road milling train reciprocal, makes it by diameter of phi
13Circular hole become minor axis Φ
23=Φ
13, major axis Φ
33=Φ
13The elliptical aperture of+0.10mm; Said major axis Φ
3Parallel with the major axis of elliptical aperture on the oval groove finishing mill of the 2nd passage reciprocal; Adjust the pass size of mm finishing mill unit the 5th road milling train reciprocal, make it by diameter of phi
15Circular hole become minor axis Φ
25=Φ
15, major axis Φ
35=Φ
15The elliptical aperture of+0.15mm; Said major axis Φ
35Parallel with the major axis of elliptical aperture on the oval groove finishing mill of the 4th passage reciprocal;
4) involve in the sector-style cold treatment to loosing at last, air-cooled speed is controlled at 5 ℃/s, and the collection volume temperature that rolls out air-cooled roller-way of loosing is controlled at 400 ℃, places surrounding air to be cooled to normal temperature.Can make dimensional accuracy height, the good high carbon chromium bearing steel hot rolling wire rod of surface quality.
Embodiment 4: it is 10mm specification high carbon chromium bearing steel hot rolling wire rod that utilization A Xiluo 45 ° of high speed no-twist finishing mills group (10 frame) legal system is equipped with the final molding diameter.
1) at first the bearing steel continuous casting steel billet is carried out heat temperature raising, and 1090 ℃ high temperature recrystallization zone carry out roughing, in roll and pre-finish rolling is handled, the accumulative total percentage elongation n=90.5 that makes rolled piece is doubly;
2) secondly rolled piece is carried out pre-water-cooled and handle, cooling velocity is controlled at 30 ℃/s, is controlled at 1.8s cool time, finally makes the rolled piece temperature be controlled at 935 ℃ of scopes
3) carry out 8 passage finish rolling, the finish rolling start rolling temperature is 935 ℃, adjusts the pass size of mm finishing mill unit the 3rd road milling train reciprocal, makes it by diameter of phi
13Circular hole become minor axis Φ
23=Φ
13, major axis Φ
33=Φ
13The elliptical aperture of+0.20mm; Adjust the pass size of mm finishing mill unit the 5th road milling train reciprocal, make it by diameter of phi
13Circular hole become minor axis Φ
23=Φ
13, major axis Φ
33=Φ
13The elliptical aperture of+0.23mm; Adjust the pass size of mm finishing mill unit the 7th road milling train reciprocal, make it by diameter of phi
17Circular hole become minor axis Φ
27=Φ
17, major axis Φ
37=Φ
17The elliptical aperture of+0.25mm;
4) involve in the sector-style cold treatment to loosing at last, air-cooled speed is controlled at 4 ℃/s, and the collection volume temperature that rolls out air-cooled roller-way of loosing is controlled at 380 ℃, places surrounding air to be cooled to normal temperature.Can make dimensional accuracy height, the good high carbon chromium bearing steel hot rolling wire rod of surface quality.
The product of the foregoing description 1～4 is respectively got two groups of regulation tests of carrying out performances such as surface quality, diameter deviation, out-of-roundness according to national standard " gren rod size, profile, weight and permissible variation " GB/T14981-2004, the results are shown in Table 2:
Table 2:
Show that from the result of table 2 the present invention can accurately control the workpiece measurement fluctuation in process of production, can control the diameter permissible variation of 92% wire rod and the C class precision that out-of-roundness can reach GB GB/T 14981-2004 regulation the wire rod of Φ 5～15mm.As seen, " finish rolling interference control " rolling process is adopted in production and processing of the present invention, and the steel and wire rod of production has good dimensional accuracy and surface quality.
Claims (2)
1. method that improves bearing steel wire rod dimensional accuracy and surface quality, it is characterized in that: this method may further comprise the steps:
1) at first the bearing steel continuous casting steel billet is carried out heat temperature raising, and 1030～1130 ℃ high temperature recrystallization zone carry out roughing, in roll and pre-finish rolling is handled, make the accumulative total percentage elongation n=65 of rolled piece～120 times;
2) secondly rolled piece is carried out pre-water-cooled and handle, cooling velocity is controlled at 20～40 ℃/s, is controlled at 0.8～2.2s cool time, finally makes the rolled piece temperature be controlled at 900～950 ℃ scope;
3) finish rolling of again rolled piece being carried out 4～10 passages is handled, and adjusts the pass size of other circular hole finishing mills except that last passage circular hole finishing mill during finish rolling, makes it by diameter of phi
1Circular hole become minor axis Φ
2=Φ
1, major axis Φ
3=Φ
1The elliptical aperture of+0.05～0.30mm, said major axis Φ
3The major axis that is adjacent the elliptical aperture on the oval groove finishing mill is parallel;
4) at last rolled piece is carried out air-cooled processing, air-cooled speed is controlled at 2～10 ℃/s, and the collection volume temperature that rolled piece goes out air-cooled roller-way is controlled at 330～450 ℃, places surrounding air to be cooled to normal temperature.
2. the method for raising bearing steel wire rod dimensional accuracy according to claim 1 and surface quality, it is characterized in that: in the described step 3), at the situation of rolled piece final molding diameter less than 10mm, the pass size of other the circular hole finishing mills of adjustment except that last passage circular hole finishing mill makes it by diameter of phi
1Circular hole become minor axis Φ
2=Φ
1, major axis Φ
3=Φ
1The elliptical aperture of+0.05～0.20mm; At the situation of rolled piece final molding diameter more than or equal to 10mm, adjust the pass size of other circular hole finishing mills except that last passage circular hole finishing mill, making it is Φ by diameter
1Circular hole become minor axis Φ
2=Φ
1, major axis Φ
3=Φ
1The elliptical aperture of+0.20～0.30mm.
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| CN2009100628452A CN101612632B (en) | 2009-06-23 | 2009-06-23 | Method for enhancing dimensional accuracy and surface quality of bearing steel wire rod |
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| CN101612632B true CN101612632B (en) | 2011-04-13 |
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| CN101905245B (en) * | 2010-07-12 | 2012-02-08 | 武汉钢铁(集团)公司 | Ultra-clean low-carbon low-silicon steel wire rod controlled rolling process |
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| CN103372565B (en) * | 2012-04-27 | 2015-07-22 | 宝山钢铁股份有限公司 | Manufacturing method of 28 mm diameter specification of steel wire rods and through high-speed wire rod production line |
| CN102831977B (en) * | 2012-09-12 | 2015-06-03 | 上海安捷防火电缆有限公司 | Preparation method for magnesium oxide fireproof cable |
| CN104141039B (en) * | 2014-06-27 | 2016-06-22 | 河北工程大学 | A kind of rolling mill practice controlling 42CrMo steel bloom gren rod decarburization |
| CN106391698A (en) * | 2016-09-19 | 2017-02-15 | 石横特钢集团有限公司 | High-tenacity large-specification angle steel production machining technology |
| CN109128059B (en) * | 2018-10-19 | 2020-04-14 | 东北大学 | Preparation method of high-strength aluminum alloy wire bar |
| CN113714278A (en) * | 2021-08-11 | 2021-11-30 | 金鼎重工有限公司 | Efficient production method of phi 12mm wire |
| CN114160585B (en) * | 2021-11-10 | 2024-01-09 | 南京钢铁股份有限公司 | Bearing steel wire rod surface quality and size control method |
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| CN1347769A (en) * | 2000-10-11 | 2002-05-08 | 李慧峰 | Finish rolling process in wire finish-rolling mill |
| CN101229551A (en) * | 2006-04-13 | 2008-07-30 | 摩根建设公司 | Modular rolling mill |
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