CN1863609A - Method and device for adjusting rolling positions of reduction rolls in three-roll mandrel mill - Google Patents

Method and device for adjusting rolling positions of reduction rolls in three-roll mandrel mill Download PDF

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Publication number
CN1863609A
CN1863609A CNA2004800293990A CN200480029399A CN1863609A CN 1863609 A CN1863609 A CN 1863609A CN A2004800293990 A CNA2004800293990 A CN A2004800293990A CN 200480029399 A CN200480029399 A CN 200480029399A CN 1863609 A CN1863609 A CN 1863609A
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Prior art keywords
wall thickness
roll
deviation
rolled
equivalent
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CNA2004800293990A
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CN100411759C (en
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山根明仁
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Nippon Steel Corp
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Sumitomo Metal Industries Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/78—Control of tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
    • B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product

Abstract

According to a method and an apparatus of the present invention for adjusting the rolling positions of the rolling rolls constituting a three-roll mandrel mill, a wall thickness of a rolled material is measured at a position corresponding to a groove bottom portion of each rolling roll, a deviation between each measured wall thickness and a target wall thickness determined by a rolling schedule is computed, and the rolling position of each rolling roll is adjusted based on each computed deviation. Therefore, the rolling position can properly be adjusted. The wall thickness of the rolled material is also measured at both positions corresponding to portions extended toward both flange portion sides from the groove bottom portions of the rolling rolls, and the rolling position of each rolling roll is adjusted based on the deviation between both measured values. Therefore, even if the rolling position of each rolling roll is considered to be apparently proper, actually the rolling position can be properly adjusted. Accordingly, the method and the apparatus of the present invention are widely adopted as means for adjusting the rolling positions of the rolling rolls constituting the three-roll mandrel mill.

Description

The depressing position method of adjustment and the adjusting device of the roll of 3 tube by three-roll mandrel mill
Technical field
The present invention relates to make in the employed 3 roll-type core rod type slitless tube mills of seamless pipe, constitute the depressing position method of adjustment and the adjusting device of the roll of this mandrel mill.
Background technology
In the manufacturing of the seamless pipe that utilizes Mannesmann's mandrel mill mode, at first, after in the rotary furnace bottom-type heating furnace, will being heated to 1200～1260 ℃, in punch, carry out drilling/rolling, make hollow bloom by plug and roll as the round steel billet of blank or billet.Then, plug is inserted in the endoporus of above-mentioned hollow bloom and the bunchiness shape, in the mandrel mill that constitutes by 5～8 frames usually, extend with concave roll constraint outer surface rolling, thereby wall thickness is reduced to the wall thickness of regulation.After this, extract plug out, with the tube reducing milling train the above-mentioned forming tubular product that subtracts after thick is rolled into the external diameter of regulation, acquisition product then.
Before, mandrel mill adopts 2 tube by three-roll mandrel mill more, in this 2 tube by three-roll mandrel mill, on each frame, set relative a pair of concave roll, between adjacent frame, make roll depress direction stagger 90 ° ground alternate configurations.In addition, the angle that also adopts on each frame configuration to depress direction in a part is 4 tube by three-roll mandrel mill of 4 concave rolls of 90 °.In addition, also proposing has 3 tube by three-roll mandrel mill, in this 3 tube by three-roll mandrel mill, is equipped with the angle of depressing direction and is 3 concave rolls of 120 ° on each frame, between adjacent frame, roll depress the direction 60 ° of ground alternate configurations that stagger.
At this, in order to ensure the wall thickness accuracy that is rolled material (tubing) in the seamless steel milling train of core rod type, restrain that it is thick partially, it is very important that the depressing position of each roll that constitutes the seamless steel milling train of core rod type is controlled at appropriate position.
Therefore, in 2 tube by three-roll mandrel mill, adopt such method more, the flange part of relative concave roll temporarily is in contact with one another, the depressing position of at this moment each roll as zero point, control depressing position (for example with reference to Japanese kokai publication hei 9-174118 communique).But, the mandrel mill of 3 roll-types or 4 roll-types, owing to increase in the free degree of the relativeness of each roll depressing position, so can not correctly adjust zero point with this method, and then can not be controlled at appropriate position to the depressing position of each roll.
In addition, in 4 tube by three-roll mandrel mill, such method is proposed: with being configured in the radioactive ray wall thickness determinator that mandrel mill is sent side, mensuration is rolled the wall thickness (the wall thickness sum that is rolled the relative part of material that radiation beams is passed through) of material, according to this measured value, adjust the depressing position (for example with reference to Japanese kokai publication hei 8-71616 communique) of roll.
Fig. 1 is the figure of the roll configuration relation in explanation 3 tube by three-roll mandrel mill.As shown in Figure 1,3 tube by three-roll mandrel mill, be rolled material with the relative part in position that is equivalent to each knurling bottom, be the position that is equivalent to another roll flange part, usually, the wall thickness that is rolled material that is equivalent to the position of flange part changes because of rolling condition easily.Therefore, the relation of this wall thickness and roll depressing position is difficult to prediction.
Therefore, even open the radioactive ray wall thickness determinator of flat 8-71616 communique record with above-mentioned spy, the wall thickness sum of the relative part that is rolled material that the mensuration radioactive ray pass through (promptly, the wall thickness and the wall thickness sum that is equivalent to the position of another roll flange part that are equivalent to the position of each knurling bottom), also be difficult to depressing position according to this measured value adjustment roll.
Summary of the invention
As mentioned above, in 3 tube by three-roll mandrel mill, different with 2 roll-types and 4 tube by three-roll mandrel mill, by the depressing position of each roll of formation milling train is controlled to appropriate position, guarantee to be rolled the wall thickness accuracy of material, suppress thick partially effective ways, also do not put forward at present.
The present invention makes in order to address the above problem, and its objective is that the roll depressing position that provides constituting 3 tube by three-roll mandrel mill is adjusted into suitable method of adjustment and device.
To achieve these goals, the present inventor is through research with keen determination, expect: measure the wall thickness of the position that is equivalent to each knurling bottom not resembling before and be equivalent to the wall thickness sum of the position of another roll flange part, but measure predict and the relation of roll depressing position, be equivalent to bottom each knurling the position be rolled the material wall thickness, according to this measured value, adjust the depressing position of each roll, like this, can guarantee to be rolled the wall thickness accuracy of material, carry out the appropriate position adjustment that can suppress thick partially, finished the present invention thus.
That is, the invention provides a kind of method of adjustment of roll depressing position of formation 3 tube by three-roll mandrel mill, this method comprises following 3 steps: the 1st step, mensuration are equivalent to the wall thickness that is rolled material of the position of each knurling bottom; The 2nd step is calculated each wall thickness that said determination goes out and the deviation of target wall thickness; The 3rd step according to above-mentioned each deviation of calculating, is adjusted the depressing position of each roll.
According to this invention, measure the wall thickness that is rolled material of the position that is equivalent to each knurling bottom, calculate the deviation of said determination each wall thickness that goes out and the target wall thickness of determining by rolling schedule, according to above-mentioned each deviation of calculating, adjust the depressing position of each roll.Above-mentioned deviation, be equivalent to adjust the position deviation at the zero point of benchmark with the position of each roll of conduct of determining by rolling schedule, so, can adjust its depressing position rightly to each roll if adjust depressing position according to above-mentioned deviation (making above-mentioned deviation is 0 ground) conversely.
In addition, mensuration be equivalent to each knurling bottom the position be rolled the material wall thickness time, for example can adopt the radiation measuring method that goes up the multiray bundle formula of record at " iron and steel " (clear and 70 years No. 9 the 1139th page～1145 pages), as long as locate each radiation beams of cross-over configuration in the position (the wall thickness center that is equivalent to the position of trench bottom) that is equivalent to each knurling bottom that is rolled material.
At this, in the mandrel mill of reality, sometimes (be rolled the core of material) in the center that is rolled material and measure to produce between the position of centre of gravity of each position be rolled the material wall thickness (when adopting above-mentioned multiray bundle formula radioactive ray, being the position that each radiation beams is intersected) and depart from.
Fig. 2 is the thick partially figure on produce when being used to be rolled the center skew of material apparent.When having produced the skew of such position, do not produce the thick partially material that is rolled even be actually, also be measured as on apparent sometimes produced thick partially.Among Fig. 2, for the sake of clarity, represent to be rolled the material wall thickness in full week, but in fact only measured the wall thickness of the position that is equivalent to each knurling bottom.This wall thickness evaluated error is relevant with the adjustment error of each roll depressing position.
Therefore, above-mentioned roll depressing position method of adjustment preferably includes: the step of measuring the center that is rolled material; Calculate center that said determination goes out, be rolled the step of deviation of position of centre of gravity of each position of material wall thickness with mensuration in above-mentioned the 1st step; In above-mentioned the 2nd step, according to the above-mentioned deviation of calculating, revised each wall thickness that said determination goes out after, calculate the deviation of this revised each wall thickness and target wall thickness.
According to this invention, mensuration is rolled the center of material, calculate the deviation of center that said determination goes out and the position of centre of gravity of measuring above-mentioned each position that is rolled the material wall thickness, according to the above-mentioned deviation of calculating, after having revised above-mentioned each determined wall thickness,, adjust depressing position according to this revised each wall thickness, so, can realize the better method of adjustment of precision.
In addition, when measuring the center that is rolled material, for example, be rolled the external diameter of material from the mutual roughly direction detection of quadrature, the center coordinate that is rolled material can be calculated in the center of the external diameter of measuring according to the center of the external diameter of measuring in one direction with at other direction (with the above-mentioned direction direction of quadrature roughly).In addition, deviation for basis center that determines and the position of centre of gravity of measuring each position that is rolled the material wall thickness, when revising tested each wall thickness of making, as long as wait the dependency relation of calculating above-mentioned deviation and wall thickness evaluated error (the thick partially amount on apparent) with test in advance, get final product according to this dependency relation correction.
Fig. 3 represents that for example the roll in 3 tube by three-roll mandrel mill adjusts the figure of state zero point.As shown in Figure 3, among 3 roll R1, R2, R3, in position that the flange part of roll R1 and R2 is in contact with one another and in position that the flange part of roll R1 and R3 is in contact with one another, be adjusted into zero point (rolling when being rolled material, with this dead-center position is benchmark, the depressing position of each roll moves equidistant) time, be equivalent to the wall thickness that is rolled material of the position of each knurling bottom sometimes, be measured as roughly the same value.Thus, the depressing position of each roll is considered to appropriate.
But, be measured as roughly the same value even be equivalent to the wall thickness that is rolled material of the position of each knurling bottom, when situation shown in Figure 3, be equivalent to be partial to the wall thickness that is rolled material of position of the part of flange part side from the trench bottom of each roll, different with the wall thickness that is equivalent to trench bottom position place, be rolled produced on the material thick partially.
The present inventor is also at said circumstances, the method of each roll depressing position of suitable adjustment has been carried out research with keen determination, the result expects: measure respectively and be equivalent to be rolled the material wall thickness from the position of the part of each knurling bottom secund and the opposing party's flange part side, according to this measured value, adjust the depressing position of each roll, like this, can guarantee to be rolled the wall thickness accuracy of material, can suppress thick partially appropriate adjustment, finish the present invention thus.
Promptly, in order to address the above problem, the invention provides the roll depressing position method of adjustment that constitutes 3 tube by three-roll mandrel mill, the method includes the steps of: measure and be equivalent to being rolled the material wall thickness, and measuring the step that is rolled the material wall thickness of the position of the part that is equivalent to be partial to another flange part side from the position of the part of each knurling bottom deflection one flange part side; Being equivalent to of calculating that said determination goes out is partial to that the wall thickness of position of part of a flange part side and said determination go out is equivalent to be partial to the step of deviation of wall thickness of position of the part of another flange part side; Adjust the step of the depressing position of each roll according to above-mentioned each deviation of calculating.
According to this invention, mensuration is equivalent to be rolled the material wall thickness from the position of the part of each knurling bottom deflection one flange part side, and measure the part be equivalent to be partial to another flange part side the position be rolled the material wall thickness, according to the deviation of two measured values, adjust the depressing position of roll.Therefore, be equivalent to the wall thickness that is rolled material of the position of each knurling bottom, be measured as roughly the same value,, also depressing position can be adjusted to actual appropriate position even the depressing position of each roll seems suitable on apparent.
In addition, as long as the adjustment amount when adjusting each roll depressing position according to the deviation of two measured values according to the locating and the geometry condition of bottom land position of two measured values, makes the deviation of two measured values become 0 and determines to get final product.
In addition, in order to address the above problem, the present invention also provides the depressing position adjusting device of the roll that constitutes 3 tube by three-roll mandrel mill, have: the wall thickness determinator, its have a plurality of radiation sources with across being rolled relative with this each radiation source respectively a plurality of detectors that disposing of material, be used to measure the wall thickness that is rolled material of the position that is equivalent to each knurling bottom; The depressing position control device, it calculates each wall thickness that said determination goes out and the deviation of target wall thickness, according to this each deviation of calculating, controls the screwdown gear of each roll.
Above-mentioned roll depressing position adjusting device preferably also has the center determinator, and it measures the center that is rolled material by be rolled the external diameter of material from the mutual roughly direction detection of quadrature; Above-mentioned depressing position control device, the deviation of the position of centre of gravity in the crosspoint of the radiation beams of calculating the center measured by above-mentioned center determinator and penetrating from a plurality of radiation sources that constitute above-mentioned wall thickness determinator, according to the above-mentioned drift correction of calculating behind each wall thickness of going out of said determination, calculate the deviation of this revised each wall thickness and target wall thickness.
In addition, in order to address the above problem, the present invention also provides the depressing position adjusting device of the roll that constitutes 3 tube by three-roll mandrel mill, have: the wall thickness determinator, its have a plurality of radiation sources with across being rolled relative with this each radiation source respectively a plurality of detectors that disposing of material, be used to measure the wall thickness that is rolled material that is equivalent to from the position of the part of each knurling bottom deflection one flange part side, and measure the wall thickness that is rolled material of the position of the part that is equivalent to be partial to another flange part side; The depressing position control device, it calculates that said determination goes out is equivalent to be partial to that the wall thickness of position of part of a flange part side and said determination go out is equivalent to be partial to the deviation of wall thickness of position of the part of another flange part side, according to above-mentioned each deviation of calculating, control the screwdown gear of each roll.
According to the present invention, measure the wall thickness that is rolled material of the position be equivalent to each knurling bottom, calculate the deviation of above-mentioned determined each wall thickness and the target wall thickness of determining by rolling schedule, according to above-mentioned each deviation of calculating, adjust the depressing position of each roll.This deviation, be equivalent to adjust the skew of the dead-center position of benchmark with each roll location of the conduct of determining by rolling schedule, so, if adjust depressing position according to above-mentioned deviation (making above-mentioned deviation become 0 ground) conversely, the wall thickness of material can be guaranteed to be rolled to each roll, thick partially appropriate depressing position adjustment can be suppressed.
In addition, according to the present invention, measure be equivalent to from the position of the part of each knurling bottom deflection one flange side be rolled the material wall thickness, and measure the position that is equivalent to be partial to another flange part side be rolled the material wall thickness, according to the deviation of two measured values, adjust the depressing position of each roll.
Therefore,, be measured as roughly the same value,, also depressing position can be adjusted in fact appropriate position even the depressing position of each roll seems suitable on apparent owing to be equivalent to the wall thickness that is rolled material of the position of each knurling bottom.
Description of drawings
Fig. 1 is the figure of the roll configuration relation in explanation 3 tube by three-roll mandrel mill.
Fig. 2 is the thick partially figure that illustrates on produced when being rolled the material center has been offset apparent.
Fig. 3 represents that for example the roll in 3 tube by three-roll mandrel mill adjusts the figure of state zero point.
Fig. 4 is the general structural map of roll depressing position adjusting device of formation 3 tube by three-roll mandrel mill of expression the present invention the 1st embodiment.
Fig. 5 is the figure of the wall thickness determinator general structure of expression an embodiment of the present invention.
Fig. 6 is the figure at mensuration position of the wall thickness determinator of explanation an embodiment of the present invention.
Fig. 7 is the figure of the roll configuration relation in explanation 3 tube by three-roll mandrel mill.
Fig. 8 be expression be rolled material offset and apparent on the figure of thick partially relation.
Fig. 9 is the figure at mensuration position of the wall thickness determinator of explanation the present invention another embodiment.
Figure 10 is the general structural map of roll depressing position adjusting device of formation 3 tube by three-roll mandrel mill of expression the present invention the 2nd embodiment.
The specific embodiment
Below, with reference to the description of drawings embodiments of the present invention.
1. the 1st embodiment
Fig. 4 is the general structural map of roll depressing position adjusting device of formation 3 tube by three-roll mandrel mill of the present invention's the 1st embodiment.As shown in Figure 4, the depressing position adjusting device 100 of present embodiment is the depressing position adjusting device that constitutes the roll of 3 tube by three-roll mandrel mill, this 3 tube by three-roll mandrel mill is made of 6 frames, in order to insert that drawing/rolling is rolled the outer surface of material T under the state in the endoporus, and on each frame, dispose 3 rolls respectively with plug B being the string shape.
More particularly, the depressing position adjusting device 100 of present embodiment is adjusted the roll R5 on latter two frame (the 5th frame and the 6th frame) that is provided in mandrel mill, the depressing position of R6.
In addition, in Fig. 4, for the sake of clarity, illustrate and on each frame, respectively be equipped with 2 roll R5, R6 respectively, but in fact, be equipped with respectively and depress 3 roll R5, the R6 that direction is mutually 120 °.
Depressing position adjusting device 100 has wall thickness determinator 1 and depressing position control device 2.Wall thickness determinator 1 is configured in the side of sending of mandrel mill, measures the wall thickness that is rolled material T (below be called the bottom land wall thickness) of the position be equivalent to each roll R5, R6 trench bottom.Depressing position control device 2 calculate each bottom land wall thickness of determining by wall thickness determinator 1, with the deviation of the target wall thickness of determining by rolling schedule that is equivalent to the trench bottom position, according to the above-mentioned deviation of calculating, control screwdown gear P5, the P6 of each roll R5, R6.
In addition, among Fig. 4, for the sake of clarity, on each frame, respectively set 1 screwdown gear P5, P6 shown in the figure respectively, but in fact, each roll R5, the R6 that is provided on each frame set screwdown gear.
In addition, the depressing position adjusting device 100 of present embodiment preferably also has center determinator 3.This center determinator 3 by be rolled the external diameter of material T from the mutual roughly direction detection of quadrature, is measured the center that is rolled material T.
Fig. 5 is the general structural map of the wall thickness determinator of an embodiment of the present invention.As shown in Figure 5, wall thickness determinator 1 is so-called multiray bundle formula radiation measuring device, have a plurality of radiation sources 11,12,13 with across be rolled material T respectively with a plurality of detectors 14,15,16 of each radiation source 11,12,13 relative configuration.Radiation beams BE1, the BE2, the BE3 that come out from 11,12,13 radiation of each radiation source intersect in the position that is equivalent to each knurling bottom that is rolled material T (be equivalent to the wall thickness of trench bottom in the middle of).
More particularly, because the mutual alignment difference (staggering 60 °) of the trench bottom of roll R5, R6 in the 5th and the 6th frame, therewith accordingly, wall thickness determinator 1 constitutes as shown in Figure 5, the crosspoint difference of the radiation beams device of (staggering 60 °), become 2 grades along the axial arrangement that is rolled material T, in one-level, measure the bottom land wall thickness of roll R5, at the bottom land wall thickness of another grade mensuration roll R6.
Fig. 6 is the figure at mensuration position of the wall thickness determinator of explanation an embodiment of the present invention.As shown in Figure 6,, be determined at the bottom land wall thickness B1～B3 of the 5th frame,, be determined at the bottom land wall thickness B4～B6 of the 6th frame in another level in one-level.Whole wall thickness determinator 1 is a structure of measuring whole bottom land wall thickness B1～B6.In addition, it is known adopting the concrete wall thickness assay method of multiray bundle formula radiation measuring device in the present embodiment, and its detailed description is omitted.
As above-mentioned shown in Figure 4, depressing position adjusting device 2, the deviation of the target wall thickness of the position that is equivalent to trench bottom of calculating each bottom land wall thickness B1～B6 of determining by wall thickness determinator 1 and determining by rolling schedule, according to the above-mentioned deviation of calculating, can control screwdown gear P5, the P6 of each roll R5, R6.
More particularly, if the bottom land wall thickness of measuring is just controlled screwdown gear less than the target wall thickness, corresponding roll is moved towards opening direction (away from the direction that is rolled material T center).Otherwise,, corresponding roll is moved towards closing direction (near the direction that is rolled material T center) if the bottom land wall thickness of measuring is then controlled screwdown gear greater than the target wall thickness.In addition, owing to must make above-mentioned deviation become 0 ground correction position, so the amount of movement of each roll R5, R6 (position correction amount) is set to the degree identical with above-mentioned deviation.
But, the depressing position control device 2 of present embodiment as mentioned above, can adopt following structure: have center determinator 3, can revise the bottom land wall thickness B1～B6 that measures according to the center of measuring by center determinator 3 that is rolled material T.
Fig. 7 is the figure of general structure of the center determinator of expression an embodiment of the present invention.Shown in 7, the center determinator 3 of present embodiment have from a direction to the bar-like light source (for example fluorescent lamp of the bright lamp type of high frequency) 31 that is rolled material T and throws light on, across be rolled material T and the bar-like light source 31 relative line sensors that disposing (for example ccd line sensor) 32, from the illumination direction of bar-like light source 31 roughly the direction of quadrature to the bar-like light source 33 that is rolled material T illumination, across being rolled the line sensor 34 that material T and bar-like light source 33 are disposing relatively.By them, be rolled the external diameter (being rolled the length of the shade of material T) of material T from the mutual roughly direction detection of quadrature.
Be rolled the center coordinate of material T, calculate according to the center X of external diameter and the center Y of external diameter, the center X of external diameter is that the combine measured by bar-like light source 31 and line sensor 32 goes out, and the center Y of external diameter is that the combine measured by bar-like light source 33 and line sensor 34 goes out.
As mentioned above, adopt when revising the constituting of bottom land wall thickness B1～B6 of mensuration according to the center that is rolled material T that determines by center determinator 3, depressing position control device 2 is calculated the center (X, Y) that determined by center determinator 3 earlier and the deviation of the position of centre of gravity in the crosspoint of the radiation beams that penetrates from a plurality of radiation sources 11,12,13 that constitute wall thickness determinator 1.
Fig. 8 be expression be rolled material offset and apparent on the figure of an example of relation of thick partially amount.At this, the dependency relation of the evaluated error of the bottom land wall thickness B1～B6 of above-mentioned deviation and mensuration (the thick partially amount on apparent) is calculated with test in advance, for example is relation shown in Figure 8.At this, the transverse axis of Fig. 8 is represented above-mentioned deviation (being rolled the offset of material) with respect to the ratio that is rolled the material radius, and the longitudinal axis is represented with the eccentric thick partially composition on following formula (1) expression apparent.
Formula (1)
Figure A20048002939900141
In the formula
R = 1 2 π Σ k = 1 n { WTk · cos θk + WTk + 1 · cos θk + 1 2 × ( θk + 1 - θk ) }
1 = - 1 2 π Σ k = 1 n { WTk · cos θk + WTk + 1 · cos θk + 1 2 ( θk + 1 - θk ) }
Figure A20048002939900144
WTn+1＝WT1
θn+1＝θ1+2π
N: measure and count
WTk: the mensuration wall thickness [mm] of k measuring point
θ k: locate (is the angle of the polar coordinates of initial point with the center that is rolled material) [rad] of k measuring point
In addition, above-mentioned formula (1) is the general-purpose type of mensuration when counting to n of expression wall thickness.In the present embodiment, it is 3 that the mensuration at different levels of formation wall thickness determinator 1 is counted, so n=3.
Then, depressing position control device 2 according to the above-mentioned deviation of calculating (the eccentric thick partially composition on apparent), is revised each the bottom land wall thickness B1～B6 determine with following formula (2).
Formula (2)
WTk ‾ = WTk + 1 2 · Ecc 100 · cos ( θk - arg ( R + 1 i ) ) - - - ( 2 )
In the formula
WTk: the mensuration wall thickness [mm] of revised k measuring point
I: imaginary unit
Arg (): the function [red] of asking the phase angle of plural number
WTk, Ecc, θ k, R, I: the identical definition of same formula (1)
In addition, depressing position control device 2 is calculated the deviation with revised each bottom land wall thickness of above-mentioned formula (2) and target wall thickness, can control screwdown gear P5, the P6 of each roll R5, R6 according to this each deviation of calculating.
As mentioned above, depressing position control device 2 in the present embodiment can adopt such structure: according to the center of being measured by center determinator 3 that is rolled material T, bottom land wall thickness B1～B6 that correction determines by adopting this structure, can adjust depressing position more accurately.
In addition, in the present embodiment, 1 situation of measuring bottom land wall thickness B1～B6 of wall thickness determinator has been described, but the present invention is not limited to this, a plurality of radiation sources that wall thickness determinator 1 also can have other with across being rolled relative with these each radiation sources respectively other a plurality of detectors that disposing of material T, mensuration is equivalent to from the wall thickness that is rolled material T of the position of the part of each roll R5, R6 trench bottom secund flange side, and measures the wall thickness that is rolled material T of the position of the part be equivalent to be partial to the opposing party's flange side.
Fig. 9 is the figure at the mensuration position of the wall thickness determinator in another embodiment of explanation the present invention.As shown in Figure 9, for the 5th frame,, also measure the wall thickness B11, the B12 that are rolled material T of the position of the part be equivalent to be partial to two flange part sides to having measured the trench bottom of bottom land wall thickness B1; To having measured the trench bottom of bottom land wall thickness B2, also measure the wall thickness B21, the B22 that are rolled material T of the position of the part be equivalent to be partial to two flange part sides; To having measured the trench bottom of bottom land wall thickness B3, also measure the wall thickness B31, the B32 that are rolled material T of the position of the part be equivalent to be partial to two flange part sides.
Then, for the 6th frame,, also measure the wall thickness B41, the B42 that are rolled material T of the position of the part be equivalent to be partial to two flange part sides to having measured the trench bottom of bottom land wall thickness B4; To having measured the trench bottom of bottom land wall thickness B5, also measure the wall thickness B51, the B52 that are rolled material T of the position of the part be equivalent to be partial to two flange part sides; To having measured the trench bottom of bottom land wall thickness B6, also measure the wall thickness B61, the B62 that are rolled material T of the position of the part be equivalent to be partial to two flange part sides.
When wall thickness determinator 1 adopts above-mentioned structure, depressing position control device 2, being equivalent to of calculating that said determination goes out, be partial to the deviation of wall thickness (for example wall thickness B12) of position of part that is equivalent to be partial to another flange side of the wall thickness (for example wall thickness B11) of position of part of a flange side and said determination, according to this each deviation of calculating, control screwdown gear P5, the P6 of each roll R5 (R51, R52, R53), R6 again.
More particularly, for example, if wall thickness B12 is greater than the wall thickness B11 corresponding with roll R51, then control screwdown gear P5, the roll R52 that locates adjacent of a side big with wall thickness (wall thickness B12) is moved towards opening direction (away from the direction that is rolled material T center), on the other hand, control screwdown gear P makes remaining 2 roll R51, R53 move towards the direction (near the direction that is rolled material T center) of closure.
Similarly, calculate the deviation of B21 and B22, B31 and B32, B41 and B42, B51 and B52, B61 and B62 respectively,, control the screwdown gear of corresponding roll equally according to its positive and negative (size).
In addition, owing to must make above-mentioned deviation become 0 ground correction position, so for example linking from locate straight line with the roll pass center of the wall thickness of trench bottom deflection flange part side, when becoming 20 degree angles with the straight line at roll pass center with respect to the binding trench bottom, the amount of movement of above-mentioned each roll R5, R6 (position correction amount) is represented with following formula (3).
The position correction amount (absolute value) of roll
Wall thickness deviation * the 1/sin of=both sides (20 °) ... (3)
By adopting above-mentioned structure, bottom land wall thickness B1～B3, the B4～B6 of each roll R5, R6 are measured as roughly the same value, even the depressing position of each roll R5, R6 seems suitable on apparent, also depressing position can be readjusted in fact appropriate position.
2. the 2nd embodiment
Figure 10 is the general structural map of roll depressing position adjusting device of formation 3 tube by three-roll mandrel mill of expression the present invention the 2nd embodiment.As shown in figure 10, the roll depressing position adjusting device 100A of formation 3 tube by three-roll mandrel mill of present embodiment, also same with the 1st embodiment, it is the depressing position adjusting device that constitutes the roll of 3 tube by three-roll mandrel mill, this 3 tube by three-roll mandrel mill is made of 6 frames, in order to insert that drawing/rolling is rolled the outer surface of material T under the state in the endoporus, and on each frame, dispose 3 rolls respectively with plug B being the string shape.
More particularly, the depressing position adjusting device 100A of present embodiment also adjusts the roll R5 on latter two frame (the 5th frame and the 6th frame) be provided in mandrel mill, the depressing position of R6.
In addition, in Figure 10, for the sake of clarity, there is shown and on each frame, respectively be equipped with 2 roll R5, R6 respectively, but in fact, be equipped with respectively and depress 3 roll R5, the R6 that direction is mutually 120 °.
Depressing position adjusting device 100A, with the 1st embodiment similarly, have wall thickness determinator 1A and depressing position control device 2A, wall thickness determinator 1A is configured in the side of sending of mandrel mill, depressing position control device 2A controls screwdown gear P5, the P6 of each roll R5, R6 according to the measurement result of wall thickness determinator 1A.
In addition, in Figure 10, for the sake of clarity, there is shown and on each frame, respectively be equipped with 1 screwdown gear P5, P6 respectively, but in fact, each roll R5, the R6 that is provided on each frame is equipped with screwdown gear.
But, different with the 1st embodiment is, the wall thickness determinator 1A of present embodiment, do not measure the bottom land wall thickness that is rolled material T, but have a plurality of radiation sources with across being rolled relative with these radiation sources respectively a plurality of detectors that disposing of material T, mensuration is equivalent to be partial to from the trench bottom of each roll R5, R6 the wall thickness that is rolled material T of position of the part of a flange part side, and measures the wall thickness that is rolled material T of the position of the part that is equivalent to be partial to another flange part side.
If with reference to Fig. 9 explanation of adopting in the explanation of the 1st embodiment, be exactly not measure bottom land wall thickness B1, B2, B34, B5, B6, but measure wall thickness B11, the B12, B21, B22, B31, B32, B41, B42, B51, B52, B61, the B62 that are rolled material T be equivalent to from the position of the part of each knurling bottom deflection two flange part side.
In addition, the depressing position control device 2A of present embodiment, calculate the deviation of wall thickness (wall thickness B12 for example shown in Figure 9) of the position of that the wall thickness (wall thickness B11 for example shown in Figure 9) of position of that said determination goes out, as to be equivalent to be partial to flange side part and said determination go out, as to be equivalent to be partial to another flange side part, according to the above-mentioned deviation of calculating, control screwdown gear P5, the P6 of each roll R5 (R51, R52, R53), R6.
More particularly, for example, if wall thickness B12 is greater than the wall thickness B11 corresponding with roll R51, then control screwdown gear P5, the roll R52 that locates adjacent of a side big with wall thickness (wall thickness 12) is moved towards opening direction (away from the direction that is rolled material T center), on the other hand, control screwdown gear P makes remaining 2 roll R51, R53 move towards the direction (near the direction that is rolled material T center) of closure.
Similarly, calculate the deviation of B21 and B22, B31 and B32, B41 and B42, B51 and B52, B61 and B62 respectively,, control the screwdown gear of corresponding roll equally according to its positive and negative (size).In addition, owing to must make above-mentioned deviation become 0 ground correction position, so for example link from the wall thickness of trench bottom deflection flange part side locate with the straight line at roll pass center when linking trench bottom and become 20 to spend angles with the straight line at roll pass center, the amount of movement of above-mentioned each roll R5, R6 (position correction amount) is represented with following formula (3).
The position correction amount (absolute value) of roll
Wall thickness deviation * the 1/sin of=both sides (20 °) ... (3)
By adopting above-mentioned structure, bottom land wall thickness B1～B3, the B4～B6 of each roll R5, R6 are measured as roughly the same value and (are meant in the present embodiment, because in fact do not measure bottom land wall thickness B1～B3, B4～B6, if so measure then be measured as roughly the same value), even seem suitable on the depressing position of each roll R5, R6 is apparent, also depressing position can be readjusted in fact appropriate position.
Embodiment
Below, by expression embodiment, will make feature of the present invention clearer and more definite.What employing had table 1 illustrated dimension is rolled material and plug, under following each condition, has implemented the manufacturing test of each rolling 30 seamless steel pipe.
[table 1]
The mandrel mill tube blank size External diameter 205mm * wall thickness 15mm
Mandrel mill is finished size External diameter 168mm * wall thickness 5mm
Diameter of mandrel External diameter 158mm
In addition, implement test 4 kinds of conditions respectively.(1) before method (flange part of roll temporarily is in contact with one another, with at this moment each roll depressing position as zero point, the method for control depressing position); (2) embodiment 1 (adjusting the method for depressing position according to bottom land wall thickness measured value); (3) embodiment 2 (, adjusting the method for depressing position according to this correction value) with the above-mentioned bottom land wall thickness of the offset correction measured value of the center that is rolled material; (4) embodiment 3 (,, adjusting the method for depressing position again) according to the deviation of the flange part side thickness measured value of roll through after the adjustment of embodiment 2; (5) embodiment 4 (, adjusting the method for depressing position) according to the deviation of the flange part side thickness measured value of roll.
Table 2 expression result of the test.As shown in table 2, to compare with method before, the mean value of the thickness ratio of embodiment 1～embodiment 4 and thickness ratio surpass 5% frequency to be reduced.This can think to go far towards can adjust rightly with the present invention the depressing position of the roll that constitutes 3 tube by three-roll mandrel mill.
[table 2]
Make the method for test The mean value of thickness ratio Thickness ratio surpasses 5% frequency
Method in the past 6％ ? 50％ ?
Embodiment 1 (adjusting depressing position) according to bottom land wall thickness measured value 3％ ? ? 30％ ? ?
Embodiment 2 (the embodiment 1+ offset correction of the center that is rolled material) 1％ ? ? 7％ ? ?
Embodiment 3 (embodiment 2+ adjusts depressing position again according to the flange part side thickness measured value of roll) 0.1％ ? ? 0％ ? ?
Embodiment 4 (adjusting depressing position) according to flange part side thickness measured value 3.5％ ? ? 30％ ? ?
The possibility of utilizing on the industry
According to the present invention, owing to measure the wall thickness that is rolled material of the position that is equivalent to each knurling bottom, calculate the deviation of said determination each wall thickness that goes out and the target wall thickness of being determined by rolling schedule, according to above-mentioned each deviation of calculating, adjust the depressing position of each roll. So, can guarantee to be rolled to each roll the wall thickness accuracy of material, can carry out the suitable depressing position adjustment that can suppress partially thick.
In addition, according to the present invention, be equivalent to be rolled the material wall thickness from the position of the part of each knurling bottom deflection one flange part side owing to measure, and measure the part be equivalent to be partial to another flange part side the position be rolled the material wall thickness, according to the deviation of two measured values, adjust the depressing position of each roll. Therefore, even when the depressing position of each roll seems suitable on apparent, also depressing position can be adjusted in fact appropriate position. Thus, can be widely used as the depressing position guiding mechanism of the roll that consists of 3 tube by three-roll mandrel mill.

Claims (6)

1. a depressing position method of adjustment that constitutes the roll of 3 tube by three-roll mandrel mill is characterized in that, comprising:
The 1st step, mensuration are equivalent to the wall thickness that is rolled material of the position of each knurling bottom;
The 2nd step is calculated each wall thickness that said determination goes out and the deviation of target wall thickness;
The 3rd step according to above-mentioned each deviation of calculating, is adjusted the depressing position of each roll.
2. the depressing position method of adjustment of the roll of formation 3 tube by three-roll mandrel mill according to claim 1 is characterized in that,
Comprise: the step of measuring the center that is rolled material;
Calculate the step of the deviation of the position of centre of gravity of measuring each position that is rolled the material wall thickness in center that said determination goes out and above-mentioned the 1st step;
In above-mentioned the 2nd step, according to the above-mentioned drift correction of calculating behind each wall thickness of going out of said determination, calculate the deviation of this revised each wall thickness and target wall thickness.
3. a depressing position method of adjustment that constitutes the roll of 3 tube by three-roll mandrel mill is characterized in that, also comprises:
Mensuration is equivalent to being rolled the material wall thickness, and measuring the step that is rolled the material wall thickness of the position of the part that is equivalent to be partial to another flange part side from the position of the part of each knurling bottom deflection one flange part side;
Being equivalent to of calculating that said determination goes out is partial to that the wall thickness of position of part of a flange part side and said determination go out is equivalent to be partial to the step of deviation of wall thickness of position of the part of another flange part side;
Adjust the step of the depressing position of each roll according to above-mentioned each deviation of calculating.
4. a depressing position adjusting device that constitutes the roll of 3 tube by three-roll mandrel mill is characterized in that, comprising:
The wall thickness determinator, its have a plurality of radiation sources with across being rolled relative with this each radiation source respectively a plurality of detectors that disposing of material, be used to measure the wall thickness that is rolled material of the position that is equivalent to each knurling bottom;
The depressing position control device, it calculates each wall thickness that said determination goes out and the deviation of target wall thickness, according to this each deviation of calculating, controls the screwdown gear of each roll.
5. the depressing position adjusting device of the roll of formation 3 tube by three-roll mandrel mill according to claim 4 is characterized in that,
Also comprise the center determinator, it measures the center that is rolled material by be rolled the external diameter of material from the mutual roughly direction detection of quadrature;
Above-mentioned depressing position control device, calculate the center that determines by above-mentioned center determinator, with the deviation of the position of centre of gravity in the crosspoint of the radiation beams that penetrates from a plurality of radiation sources that constitute above-mentioned wall thickness determinator, according to the above-mentioned drift correction of calculating behind each wall thickness of going out of said determination, calculate the deviation of this revised each wall thickness and target wall thickness.
6. a depressing position adjusting device that constitutes the roll of 3 tube by three-roll mandrel mill is characterized in that, comprising:
The wall thickness determinator, its have a plurality of radiation sources with across being rolled relative with this each radiation source respectively a plurality of detectors that disposing of material, be used to measure the wall thickness that is rolled material that is equivalent to from the position of the part of each knurling bottom deflection one flange part side, and measure the wall thickness that is rolled material of the position of the part that is equivalent to be partial to another flange part side;
The depressing position control device, it calculates that said determination goes out be equivalent to be partial to the position of a flange part sidepiece branch wall thickness, be partial to the deviation of wall thickness of position of the part of another flange part side with said determination being equivalent to of going out, according to the screwdown gear of above-mentioned each each roll of Deviation Control of calculating.
CNB2004800293990A 2003-10-07 2004-10-06 Method and device for adjusting rolling positions of reduction rolls in three-roll mandrel mill Expired - Fee Related CN100411759C (en)

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CN101711190B (en) * 2007-03-30 2011-10-12 住友金属工业株式会社 Seamless pipe manufacturing method
CN102481607A (en) * 2009-08-11 2012-05-30 住友金属工业株式会社 Apparatus for adjusting screw-down position of mill roll which constitutes three-roll type mandrel mill, and method for manufacturing seamless pipe
CN102873100A (en) * 2011-07-13 2013-01-16 中冶东方工程技术有限公司 Three-roller full-floating mandrel continuous pipe rolling mill and rolling process thereof
CN104858246A (en) * 2014-02-26 2015-08-26 Sms米尔股份有限公司 Method And Program For Analyzing Pipe Wall-thickness Variations
CN112823064A (en) * 2018-10-11 2021-05-18 Sms集团有限公司 Wall thickness control during pipe tension reducing

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EP1918034B1 (en) * 2005-08-02 2012-06-20 Sumitomo Metal Industries, Ltd. Device and method for detecting flaw on tube
CN103801558B (en) * 2014-01-27 2015-12-30 胜利油田康贝石油工程装备有限公司 Oil the ladder type seam processing method of slot pipe and equipment

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JPS60261614A (en) * 1984-06-08 1985-12-24 Sumitomo Metal Ind Ltd Thickness controlling method of seamless pipe
JPH0871616A (en) 1994-09-01 1996-03-19 Sumitomo Metal Ind Ltd Device for rolling seamless tube and method for controlling rolling
CN1107394A (en) * 1994-11-23 1995-08-30 宝山钢铁(集团)公司 Central line measuring and correction technique for metal pipe rolled by piercing mill
JP3633071B2 (en) 1995-12-22 2005-03-30 住友金属工業株式会社 Pipe rolling mill and roll position setting method
JP3743609B2 (en) * 2000-04-13 2006-02-08 住友金属工業株式会社 Seamless pipe rolling apparatus and rolling control method
DE10201717C1 (en) * 2002-01-18 2003-04-10 Sms Meer Gmbh Pipe rolling stand in which at least two rollers work together, takes the measured pipe wall thickness at different peripheral positions to control the roller rotary speeds independently
JP4003463B2 (en) * 2002-01-28 2007-11-07 住友金属工業株式会社 Seamless steel pipe manufacturing method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101711190B (en) * 2007-03-30 2011-10-12 住友金属工业株式会社 Seamless pipe manufacturing method
CN102481607A (en) * 2009-08-11 2012-05-30 住友金属工业株式会社 Apparatus for adjusting screw-down position of mill roll which constitutes three-roll type mandrel mill, and method for manufacturing seamless pipe
CN102873100A (en) * 2011-07-13 2013-01-16 中冶东方工程技术有限公司 Three-roller full-floating mandrel continuous pipe rolling mill and rolling process thereof
CN102873100B (en) * 2011-07-13 2014-12-17 中冶东方工程技术有限公司 Three-roller full-floating mandrel continuous pipe rolling mill and rolling process thereof
CN104858246A (en) * 2014-02-26 2015-08-26 Sms米尔股份有限公司 Method And Program For Analyzing Pipe Wall-thickness Variations
CN112823064A (en) * 2018-10-11 2021-05-18 Sms集团有限公司 Wall thickness control during pipe tension reducing

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EP1676651A1 (en) 2006-07-05
CN100411759C (en) 2008-08-20
EP1676651B1 (en) 2011-01-26
RU2006115561A (en) 2007-11-20
EP2085157A1 (en) 2009-08-05
WO2005035153A1 (en) 2005-04-21
DE602004031247D1 (en) 2011-03-10
EP2085157B1 (en) 2012-04-18

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