CN100435986C - Hot-rolling method for abnormal steel rod with stable nail - Google Patents
Hot-rolling method for abnormal steel rod with stable nail Download PDFInfo
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- CN100435986C CN100435986C CNB2005100420757A CN200510042075A CN100435986C CN 100435986 C CN100435986 C CN 100435986C CN B2005100420757 A CNB2005100420757 A CN B2005100420757A CN 200510042075 A CN200510042075 A CN 200510042075A CN 100435986 C CN100435986 C CN 100435986C
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Abstract
The present invention relates to a hot rolling method of abnormal round steel with stable nails. According to distribution situations of the stable nails on a rod body of the round steel, the present invention adopts the hot rolling method that a, the stable nails are in a staggered arrangement, and a circle, flat ellipse and round hole type system is adopted, wherein a groove of one final product hole of a roller is arranged between two adjacent grooves of the other final product hole of the roller; b, the stable nails are in a symmetric arrangement, an ordinary twisted steel hole shape is adopted, and the grooves of the two final product holes of the roller are in symmetric distribution corresponding to a line of centers of rolling pieces; c, the stable nails are in a single side arrangement, a circle, metamorphosis ellipse and a round hole type system is adopted, and grooves are arranged on final product holes. The present invention has the advantages of simplicity, easy implement, high production efficiency, integration rolling molding of the stable nails and the round steel, firmness and reliability.
Description
Technical field
A kind of hot-rolling method with steady nail abnormal steel rod that the present invention relates to is specially adapted to make the hot-rolling method that band that the various sucker rods in oil equipment field use is surely followed closely abnormal steel rod.
Background technology
Along with the China's oil exploitation enters epoch middle and later periods, oil reservoir skewness weighing apparatus, the uncertainty of geologic structure strengthens, performance requirement to the integral body of petroleum recovering equipment and auxiliary equipment is more and more higher, especially use the oil production method of mechanical movement lifting to be still a kind of main path now, as critical component---the sucker rod in the petroleum machinery oil production equipment system, its function, performance requirement just become the focus that receives much concern, and especially have paraffin cutting, set upright and the sucker rod of anti-eccentric wear function more is subjected to oil field user's welcome.Therefore, the special-shaped alloy round steel material that is used to make the features sucker rod has become an urgent demand.The present processing method of this abnormal shape alloy round steel has hot upset forging processing type and welding processing type, because hot upset forging processing type cost height, production efficiency is low; The welding processing type easily snaps and easily causes shortcomings such as chemical attack and electrochemical corrosion with welding region and can not satisfy the production actual needs.Adopt hot-rolling method because the inhomogeneous deformation of metal easily causes steady nail filling discontented, surely follow closely defectives such as regional round steel section pulling-down, particularly steady nail being staggered arrange and steady nail to be the rolling defect of abnormal steel rod of monolateral layout particularly outstanding.This shows, realize that the technical difficulty of hot-roll forming of this abnormal steel rod is bigger.
Summary of the invention
The present invention is just for overcoming the prior art deficiency, a kind of hot-rolling method that provides.
By the distribution situation of surely following closely on the round steel body of rod, the present invention solves its technical problem and adopts following scheme.
1, steady nail is distributed in the round steel both sides, and dislocation and uniform is surely followed closely in both sides.
The inhomogeneous deformation of metal occurs on the section of steady nail in the operation of rolling, causes steady nail filling discontented, the section pulling-down, and in order to solve this contradiction, milling method adopts circle-flat oval-circular hole system.The conventional pass schedule of this pass schedule has been done bigger improvement on the concrete size of rolled piece, satisfied the charging quantity of metal maximum, prevents the section pulling-down.Rolled piece adopts circular apertures, its b by pre-leader pass
3≈ h
3, b
3Be the pre-leader pass width of rebate, h
3Be the pre-leader pass height, b
3General round steel workpiece measurement is big; Enter leader pass after rolling, it adopts single circular arc flat oval type hole, its b
2/ h
2〉=3, b
2Be the leader pass width of rebate, h
2Be the leader pass height, h
20.5～0.6 times of=finished product hole height; Rolling after enter the finished product hole after turning over 90 ° of steel, all fluted on the finished product hole of each roll, and groove is uniform on the finished product hole, and the groove of one of them roll is in the centre position of two adjacent grooves of another roll.
2, steady nail is not distributed in the round steel both sides
With the difference of scheme 1 be that groove is not uniform on the finished product hole of each roll.
3, steady nail is symmetrically arranged in the round steel both sides.
Be equivalent to the regular screw threads steel, adopt regular screw threads steel pass to get final product, but must increase deflection and draught pressure, reduce the depression that rolled piece causes discontinuity to produce owing to short time set is inhomogeneous, guarantee the degree of filling of the steady nail of convex shaped, therefore leader pass adopts single circular arc flat oval type hole, and satisfies b
2/ h
2=2.5～3, b
2Be the leader pass width of rebate, h
2It is the leader pass height; Rolling after enter the finished product hole after turning over 90 ° of steel, all fluted on the finished product hole of two coupling rolls, the groove of one of them roll and the groove of another roll are symmetrically distributed with respect to the rolled piece line of centres.
During scheme 1～3 groove rolling, for guaranteeing the relative position of two two groups of grooves on the coupling roll finished product hole, two coupling rolls will perform mark, to guarantee initial alignment; Adopt single roller transmission, two roller interlocks are to guarantee the running location.
4, steady nail is distributed in round steel one side.
If will follow closely surely that physical dimension guarantees then the cross dimensions pulling-down, otherwise, with steady nail dimension pulling-down.This inhomogeneous deformation is the biggest factor that causes product quality.Adopt abnormal circle-abnormal ellipse-circular hole system, the inhomogeneous deformation that this pass schedule makes full use of leader pass guarantees the homogeneous deformation in finished product hole, thereby obtains standard compliant finished product section physical dimension for this reason.Rolled piece enters pre-leader pass, and it adopts special-shaped circular apertures, and satisfies h
31=h
32+ 3, R
32=R
31+ Δ
3, h
31Be hole height on the pre-leader pass, h
32Be hole height under the pre-leader pass, R
31Be radius of circle in the hole on the pre-leader pass, R
32Be radius of circle in the hole under the pre-leader pass, Δ
3Be radius of circle surplus in the hole under the pre-leader pass, b
3Be the pre-leader pass width of rebate, b
3General round steel workpiece measurement is big; Rolling after enter leader pass after turning over 90 ° of steel, it adopts special-shaped flat oval type hole, and satisfies h
20.5～0.6 times of=finished product hole height, h
2Be the leader pass height, R
21=R
22+ Δ
2, R
21Be the right oval radius of leader pass, R
22Be the oval radius in a leader pass left side, Δ
2Be the right oval radius surplus of leader pass, b
21=b
22+ 2, b
21Be the right oval width of leader pass, b
22Be the oval width in a leader pass left side, b
220.9 times of=finished product hole width; Rolling after enter the finished product hole after turning over 90 ° of steel, fluted on it, and groove is uniform on the finished product hole of roll.
5, round steel one side has not uniform steady nail.
With the difference of scheme 4 be that groove is not uniform on the finished product hole of roll.
On the finished product hole of roll, process the groove of respective shapes and size in the above scheme 1～5 by the shape and size of steady nail requirement, the processing of methods such as the available system of milling, electric spark.The circumferential distance of two adjacent grooves on same roll is the distance corresponding to round steel body of rod homonymy two adjacent steady nails, according to two adjacent steady pitchs of nails from size and number diameter and the groove number of designing roll.Utilize the finished product hole that rolled piece is carried out crimp when rolling, make metal enter groove and obtain surely following closely with the measure-alike convex shaped of groove shapes.
The present invention is simple, the production efficiency height, and steady nail of convex shaped and round steel one roll forming, the steady stickfast of convex shaped is reliable admittedly.
Description of drawings
Fig. 1～Fig. 5 is a sucker rod with the shape figure of the steady nail of band abnormal steel rod, and wherein 1 is the round steel body of rod, and 2 surely follow closely for convex shaped.
Fig. 6～Figure 10 is the roll pass figure that produces the steady nail of band abnormal steel rod, wherein, and K
1Be the finished product hole, 1-1 is a groove, K
2Be leader pass, K
3Be pre-leader pass, 4 is roll.
Fig. 6 is for adopting circle-flat oval-circular hole system.The pre-leader pass K of two coupling rolls 4
3Adopt circular apertures, b
3Be the pre-leader pass width of rebate, h
3Be the pre-leader pass height, R
3Be the pre-leader pass arc radius, its b
3≈ h
3, b
3General round steel workpiece measurement is big; Leader pass K
2Adopt single circular arc flat oval type hole, b
2Be the leader pass width of rebate, h
2Be the leader pass height, its b
2/ h
2〉=3, h
20.5～0.6 times of=finished product hole height; The finished product hole K of each roll 4
1On all fluted 1-1, and groove 1-1 is at finished product hole K
1Upward uniform, the groove 1-1 of one of them roll 4 is in the centre position of two adjacent groove 1-1 of another roll 4.The band that Fig. 1 produces for this kind pass is surely followed closely abnormal steel rod.For steady nail is distributed in the round steel both sides, dislocation and uniform is surely followed closely in both sides.
The difference of Fig. 7 and Fig. 6 is that groove 1-1 is at the finished product hole of each roll 4 K
1On not uniform.The band that Fig. 2 produces for this kind pass is surely followed closely abnormal steel rod.For steady nail is not distributed in the round steel both sides.
Fig. 8 is that two coupling rolls 4 adopt regular screw threads steel pass to get final product, but must increase deflection and draught pressure, reduces the depression that rolled piece causes discontinuity to produce owing to short time set is inhomogeneous, guarantees the degree of filling of the steady nail of convex shaped, so leader pass K
2Adopt single circular arc flat oval type hole, and satisfy b
2/ h
2=2.5～3, b
2Be the leader pass width of rebate, h
2It is the leader pass height; The finished product hole K of two coupling rolls 4
1On all fluted 1-1, the groove 1-1 of one of them roll 4 and the groove 1-1 of another roll 4 are symmetrically distributed with respect to the rolled piece line of centres.The band that Fig. 3 produces for this kind pass is surely followed closely abnormal steel rod.For steady nail is symmetrically arranged in the round steel both sides.
During Fig. 6～Fig. 8 groove rolling, for guaranteeing two coupling rolls, 4 finished product hole K
1On the relative position of two groups of groove 1-1, two coupling rolls 4 will perform mark, to guarantee initial alignment; Adopt single roller transmission, two roller interlocks are to guarantee the running location.
Fig. 9 is for adopting abnormal circle-abnormal ellipse-circular hole system, the pre-leader pass K of two coupling rolls 4
3Adopt special-shaped circular apertures, and satisfy h
31=h
32+ 3, R
32=R
31+ Δ
3, h
31Be hole height on the pre-leader pass, h
32Be hole height under the pre-leader pass, R
31Be radius of circle in the hole on the pre-leader pass, R
32Be radius of circle in the hole under the pre-leader pass, Δ
3Be radius of circle surplus in the hole under the pre-leader pass, b
3Be the pre-leader pass width of rebate, b
3General round steel workpiece measurement is big; Leader pass K
2Adopt special-shaped flat oval type hole, and satisfy h
20.5～0.6 times of=finished product hole height, h
2Be the leader pass height, R
21=R
22+ Δ
2, R
21Be the right oval radius of leader pass, R
22Be the oval radius in a leader pass left side, Δ
2Be the right oval radius surplus of leader pass, b
21=b
22+ 2, b
21Be the right oval width of leader pass, b
22Be the oval width in a leader pass left side, b
220.9 times of=finished product hole width; Finished product hole K
1Go up fluted 1-1, and groove 1-1 is at the finished product hole of roll 4 K
1Go up uniform.The band that Fig. 4 produces for this kind pass is surely followed closely abnormal steel rod.For steady nail is distributed in round steel one side.
The difference of Figure 10 and Fig. 9 is that groove 1-1 is at the finished product hole of roll 4 K
1On not uniform.The band that Fig. 5 produces for this kind pass is surely followed closely abnormal steel rod.For round steel one side has not uniform steady nail.
The specific embodiment
By the distribution situation of surely following closely on the round steel body of rod, the present invention solves its technical problem and adopts following embodiment.
1, steady nail is distributed in the round steel both sides, and dislocation and uniform is surely followed closely in both sides.
Adopt circle-flat oval-circular hole system.The conventional pass schedule of this pass schedule has been done bigger improvement on the concrete size of rolled piece, satisfied the charging quantity of metal maximum, prevents the section pulling-down.Rolled piece is by pre-leader pass K
3, adopt circular apertures, its b
3≈ h
3, b
3Be the pre-leader pass width of rebate, h
3Be the pre-leader pass height, b
3General round steel workpiece measurement is big; Enter leader pass K after rolling
2, it adopts single circular arc flat oval type hole, its b
2/ h
2〉=3, b
2Be the leader pass width of rebate, h
2Be the leader pass height, h
20.5～0.6 times of=finished product hole height; Rolling after enter finished product hole K after turning over 90 ° of steel
1, the finished product hole K of each roll 4
1On all fluted 1-1, and groove 1-1 is at finished product hole K
1Upward uniform, the groove 1-1 of one of them roll 4 is in the centre position of two adjacent groove 1-1 of another roll 4.
2, steady nail is not distributed in the round steel both sides.
With the difference of embodiment 1 be that groove 1-1 is at the finished product hole of each roll 4 K
1On not uniform.
3, steady nail is symmetrically arranged in the round steel both sides.
Be equivalent to the regular screw threads steel, adopt regular screw threads steel pass to get final product, but must increase deflection and draught pressure, reduce the depression that rolled piece causes discontinuity to produce owing to short time set is inhomogeneous, guarantee the degree of filling of the steady nail of convex shaped, so leader pass K
2Adopt single circular arc flat oval type hole, and satisfy b
2/ h
2=2.5～3, b
2Be the leader pass width of rebate, h
2It is the leader pass height; Rolling after enter finished product hole K after turning over 90 ° of steel
1, the finished product hole K of two coupling rolls 4
1On all fluted 1-1, the groove 1-1 of one of them roll 4 and the groove 1-1 of another roll 4 are symmetrically distributed with respect to the rolled piece line of centres.
During embodiment 1～3 groove rolling, for guaranteeing two coupling rolls, 4 finished product hole K
1On the relative position of two groups of groove 1-1, two coupling rolls 4 will perform mark, to guarantee initial alignment; Adopt single roller transmission, two roller interlocks are to guarantee the running location.
4, steady nail is distributed in round steel one side.
Adopt abnormal circle-abnormal ellipse-circular hole system, this pass schedule makes full use of leader pass K
2Inhomogeneous deformation guarantee finished product hole K
1Homogeneous deformation, thereby obtain standard compliant finished product section physical dimension.Rolled piece enters pre-leader pass K
3, it adopts special-shaped circular apertures, and satisfies h
31=h
32+ 3, R
32=R
31+ Δ
3, h
31Be hole height on the pre-leader pass, h
32Be hole height under the pre-leader pass, R
31Be radius of circle in the hole on the pre-leader pass, R
32Be radius of circle in the hole under the pre-leader pass, Δ
3Be radius of circle surplus in the hole under the pre-leader pass, b
3Be the pre-leader pass width of rebate, b
3General round steel workpiece measurement is big; Rolling after enter leader pass K after turning over 90 ° of steel
2, it adopts special-shaped flat oval type hole, and satisfies h
20.5～0.6 times of=finished product hole height, h
2Be the leader pass height, R
21=R
22+ Δ
2, R
21Be the right oval radius of leader pass, R
22Be the oval radius in a leader pass left side, Δ
2Be the right oval radius surplus of leader pass, b
21=b
22+ 2, b
21Be the right oval width of leader pass, b
22Be the oval width in a leader pass left side, b
220.9 times of=finished product hole width; Rolling after enter finished product hole K after turning over 90 ° of steel
1, fluted 1-1 on it, and groove 1-1 is at the finished product hole of roll 4 K
1Go up uniform.
5, round steel one side has not uniform steady nail.
With the difference of embodiment 4 be that groove 1-1 is at the finished product hole of roll 4 K
1On not uniform.
In the above embodiment 1～5 by the shape and size of steady nail requirement at the finished product hole of roll 4 K
1On process the groove 1-1 of respective shapes and size, the processing of methods such as the available system of milling, electric spark.The circumferential distance of two adjacent groove 1-1 on same roll 4 is the distance corresponding to round steel body of rod homonymy two adjacent steady nails, according to two adjacent steady pitchs of nails from size and number diameter and the groove 1-1 number of designing roll 4.Utilize finished product hole K when rolling
1Rolled piece is carried out crimp, make metal enter groove 1-1 and obtain the convex shaped identical and surely follow closely with groove 1-1 geomery.
The present invention is simple, the production efficiency height, and steady nail of convex shaped and round steel one roll forming, the steady stickfast of convex shaped is reliable admittedly.
Claims (3)
1, a kind of hot-rolling method with steady nail abnormal steel rod is characterized in that:
The steady nail of a, this abnormal steel rod is staggered and arranges that milling method adopts circle-flat oval-circular hole system, and rolled piece is by pre-leader pass (K
3), adopt circular apertures, its b
3≈ h
3, b
3Be pre-leader pass (K
3) width of rebate, b
3General round steel workpiece measurement is big, h
3Be pre-leader pass (K
3) highly, enter leader pass (K after rolling
2), it adopts single circular arc flat oval type hole, its b
2/ h
2〉=3, b
2Be leader pass (K
2) width of rebate, h
2Be leader pass (K
2) highly, h
20.5～0.6 times of=finished product hole height, rolling after enter finished product hole (K after turning over 90 ° of steel
1), the finished product hole (K of each roll (4)
1) on all fluted (1-1), and groove (1-1) is at finished product hole (K
1) upward uniform or not uniform, the groove (1-1) of one of them roll (4) is in the centre position of the two adjacent grooves (1-1) of another roll (4) or not in the centre position;
The steady nail of b, this abnormal steel rod is symmetric arrangement, adopts regular screw threads steel pass to get final product leader pass (K
2) adopt single circular arc flat oval type hole, and satisfy b
2/ h
2=2.5～3, b
2Be leader pass (K
2) width of rebate, h
2Be leader pass (K
2) highly, rolling after enter finished product hole (K after turning over 90 ° of steel
1), the finished product hole (K of two coupling rolls (4)
1) on all fluted (1-1), the groove (1-1) of one of them roll (4) and the groove (1-1) of another roll (4) are symmetrically distributed with respect to the rolled piece line of centres;
The steady nail of c, this abnormal steel rod is monolateral layout, adopts abnormal circle-abnormal ellipse-circular hole system, and rolled piece enters pre-leader pass (K
3), it adopts special-shaped circular apertures, and satisfies h
31=h
32+ 3, R
32=R
31+ Δ 3, h
31Be pre-leader pass (K
3) last hole height, h
32Be pre-leader pass (K
3) following hole height, R
31Be pre-leader pass (K
3) go up radius of circle in the hole, R
32Be pre-leader pass (K
3) following radius of circle in the hole, Δ
3Be pre-leader pass (K
3) following radius of circle surplus in the hole, b
3Be pre-leader pass (K
3) width of rebate, b
3General round steel workpiece measurement is big, and is rolling after enter leader pass (K after turning over 90 ° of steel
2), it adopts special-shaped flat oval type hole, and satisfies h
20.5～0.6 times of=finished product hole height, h
2Be leader pass (K
2) highly, R
21=R
22+ Δ
2, R
21Be leader pass (K
2) right oval radius, R
22Be leader pass (K
2) left oval radius, Δ
2Be leader pass (K
2) right oval radius surplus, b
21=b
22+ 2, b
21Be leader pass (K
2) right oval width, b
22Be leader pass (K
2) left oval width, b
220.9 times of=finished product hole width, rolling after enter finished product hole (K after turning over 90 ° of steel
1), fluted on it (1-1), and groove (1-1) is at the finished product hole of roll (4) (K
1) upward uniform or not uniform.
2, band according to claim 1 is surely followed closely the hot-rolling method of abnormal steel rod, and its feature also is: by surely following closely the shape and size of requirement at the finished product hole of roll (4) (K
1) on process the groove (1-1) of respective shapes and size.
3, band according to claim 1 is surely followed closely the hot-rolling method of abnormal steel rod, and its feature also is: for guaranteeing two coupling rolls (4) finished product hole (K
1) on the relative position of two groups of grooves (1-1), two coupling rolls (4) will perform mark, to guarantee initial alignment; Adopt single roller transmission, two roller interlocks are to guarantee the running location.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100420757A CN100435986C (en) | 2005-02-03 | 2005-02-03 | Hot-rolling method for abnormal steel rod with stable nail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100420757A CN100435986C (en) | 2005-02-03 | 2005-02-03 | Hot-rolling method for abnormal steel rod with stable nail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1814363A CN1814363A (en) | 2006-08-09 |
| CN100435986C true CN100435986C (en) | 2008-11-26 |
Family
ID=36906782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100420757A Active CN100435986C (en) | 2005-02-03 | 2005-02-03 | Hot-rolling method for abnormal steel rod with stable nail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100435986C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102451818A (en) * | 2010-10-29 | 2012-05-16 | 赵奎杰 | Profiled bar steel and roller thereof |
| CN105598329A (en) * | 2015-12-31 | 2016-05-25 | 山东九环石油机械有限公司 | Method for processing irregular round steel |
| CN106734189A (en) * | 2016-12-27 | 2017-05-31 | 山东九环石油机械有限公司 | A kind of hot-rolling method with raised abnormity oval steel |
| CN114472540B (en) * | 2022-01-25 | 2023-11-03 | 首钢长治钢铁有限公司 | Control method for general size uniformity of finished rod and wire |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4524598A (en) * | 1983-10-07 | 1985-06-25 | Westinghouse Electric Corp. | Method of rolling a simulated hole in sheet metal without drilling or punching |
| US4876837A (en) * | 1988-08-22 | 1989-10-31 | Usg Interiors, Inc. | Corner bead structure |
| JPH06269890A (en) * | 1993-03-22 | 1994-09-27 | Kanemitsu Kogyo Kk | Production of structural material for channel cap |
| JPH07148539A (en) * | 1993-11-29 | 1995-06-13 | Mitsuba Seisakusho:Kk | Grating bar with nonskid pattern and its producing device |
| US6035683A (en) * | 1997-07-12 | 2000-03-14 | Sms Schloemann-Siemag Aktiengesellschaft | Method of casting and rolling and roll stand arrangement for rolling finished sections (sheet piling sections) from a preliminary section arriving from a continuous casting machine and having approximate final dimensions |
-
2005
- 2005-02-03 CN CNB2005100420757A patent/CN100435986C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4524598A (en) * | 1983-10-07 | 1985-06-25 | Westinghouse Electric Corp. | Method of rolling a simulated hole in sheet metal without drilling or punching |
| US4876837A (en) * | 1988-08-22 | 1989-10-31 | Usg Interiors, Inc. | Corner bead structure |
| JPH06269890A (en) * | 1993-03-22 | 1994-09-27 | Kanemitsu Kogyo Kk | Production of structural material for channel cap |
| JPH07148539A (en) * | 1993-11-29 | 1995-06-13 | Mitsuba Seisakusho:Kk | Grating bar with nonskid pattern and its producing device |
| US6035683A (en) * | 1997-07-12 | 2000-03-14 | Sms Schloemann-Siemag Aktiengesellschaft | Method of casting and rolling and roll stand arrangement for rolling finished sections (sheet piling sections) from a preliminary section arriving from a continuous casting machine and having approximate final dimensions |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1814363A (en) | 2006-08-09 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CB03 | Change of inventor or designer information |
Inventor after: Xin Minchang Inventor after: Liu Xinjiang Inventor after: Liu Jiang Inventor after: Li Min Inventor after: Song Mengyu Inventor after: Zhang Juguo Inventor before: Xin Minchang Inventor before: Liu Jiang Inventor before: Li Min Inventor before: Song Mengyu Inventor before: Zhang Juguo |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: XIN MINCHANG LIU JIANG LI MIN SONG MENGYU ZHANG JUGUO TO: XIN MINCHANG LIUXINJIANG LIU JIANG LI MIN SONG MENGYU ZHANG JUGUO |