CA2118295A1 - Method of operation for rolling round sections having predetermined precise finished dimensions and group of rolling stands for carrying out the method - Google Patents
Method of operation for rolling round sections having predetermined precise finished dimensions and group of rolling stands for carrying out the methodInfo
- Publication number
- CA2118295A1 CA2118295A1 CA002118295A CA2118295A CA2118295A1 CA 2118295 A1 CA2118295 A1 CA 2118295A1 CA 002118295 A CA002118295 A CA 002118295A CA 2118295 A CA2118295 A CA 2118295A CA 2118295 A1 CA2118295 A1 CA 2118295A1
- Authority
- CA
- Canada
- Prior art keywords
- rolling
- stands
- group
- stand
- rolling stands
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000009467 reduction Effects 0.000 claims abstract description 9
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
- B21B35/02—Drives for metal-rolling mills, e.g. hydraulic drives for continuously-operating mills
-
- 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
- B21B37/48—Tension control; Compression control
- B21B37/52—Tension control; Compression control by drive motor control
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method of operation for rolling round sections having predetermined precise finished dimensions in a group of adjustable rolling stands arranged following a wire rolling train and including two-high horizontal, vertical and horizontal rolling stands which are arranged closely one behind the other.
In the first two rolling stands, a pass reduction of between 14%
and 28% is carried out and the rolling speed is adjusted in such a way that only a low tension occurs, and in the last rolling stand, the pass reduction is 1% to 5% and the force of the drive of this rolling stand is limit-adjusted in such a way that the cross section of the rolled material is not reduced between the last rolling stand and the preceding rolling stand. The group of rolling stands for carrying out the method includes a first motor for jointly driving the first and second rolling stands and a motor with adjustable current limitation for driving the third rolling stand.
A method of operation for rolling round sections having predetermined precise finished dimensions in a group of adjustable rolling stands arranged following a wire rolling train and including two-high horizontal, vertical and horizontal rolling stands which are arranged closely one behind the other.
In the first two rolling stands, a pass reduction of between 14%
and 28% is carried out and the rolling speed is adjusted in such a way that only a low tension occurs, and in the last rolling stand, the pass reduction is 1% to 5% and the force of the drive of this rolling stand is limit-adjusted in such a way that the cross section of the rolled material is not reduced between the last rolling stand and the preceding rolling stand. The group of rolling stands for carrying out the method includes a first motor for jointly driving the first and second rolling stands and a motor with adjustable current limitation for driving the third rolling stand.
Description
2 ~
BACRGRO D OF T~E INVENTION
1. ~ield of the Iuvention The present invention relates to a method of operation for rolling round sections having predetermined precise finished dimensions in a group of adjustable rolling stands arranged following a wire rolling train and including two-high horizontal, vertical and horizontal rolling stands which are arranged closely one behind the other.
2. Descriptio~ of the Related Art Numerous proposals concerning methods of operation of the above-described type and groups of rolling stands for carrying ;.:
out such methods of operation are known in the art. For example, Brauer "Weiterentwicklungen der Dreiwalzen-Umformblocke", .
[Further Developments of Three-High Shaping Blocks] Stahl und Eisen 112/192, No. 7 discloses the arrangement of three-high - .- .
rolling stands in blocks of three stands. The use of two-high rolling stands with two-sided support of the rolls, also in ;~ :
blocks of three stands, is described in the brochure Morgan :~
:.:
Construction Co. ""TEKISUN BAR SIZING MILL TECHNOLOGY".
The two known methods of operation mentioned above have in common that they operate with relatively low total pass ~ .
2 ;~
~; ,. ~ ' ;;' 2 ~
reductions, i.e, at most approximately 14~, and, as a result, with a limited capacity, and that the groups of rolling stands used in the metXods are of relatively complicated construction, -particularly the roll supports and the roll drives in the blocks of three-roll stands and the stands themselves in all groups of ~ :~
rolling stands, because of the necessary extremely high stand ~:
stiffnesses with spring characteristics of O.004 mm/kN and less ~. ~
and the required high adjustment accuracy. ~ :
.': . . ' , ! , ', ,". , ' - , .
2 1 1 ~
S~MMARY 0~ T~E INVENTION
Therefore, it is the object of the present invention to provide a method of operation and a group of rolling stands of the above-described type which overcomes the disadvantages of the ;-prior art arrangements described above.
In accordance with the present invention, in the first two rolling stands, a significantly greater pass reduction of between 14% and 28% is adjusted and the rolling speed is adjusted in such a way that only a low tension occurs, and in the last rolling -stand, the pass reduction is adjusted to 1% to 5% and the force of the drive of this rolling stand is limit-adjusted in such a '-way that the cross section of the rolled material is not reduced between the last rolling stand and the preceding rolling stand.
It has been found that the method according to the present invention makes it possible to roll good round sections whose ;~
finished dimensions are of comparably good accuracy. ; , ;
The group of rolling stands for carrying out the above-described method of operation may include, in accordance with the present invention, a first motor for jointly driving the first and second rolling stands and a motor with adjustable current -limitation for driving the third r~lling stand.
'~ ,' ' ~.
. ~ ~
In accordance with another feature of the present invention, the value of the stand springiness of the rolling stands of the group can be limited to about 0.001 mm/kN. The rolls may be -~
cantilevered, i.e. mounted with one-sided support, and the rolling stands may be spaced apart from each other by approximately 600 to 750mm. The rolls may be constructed as roll ~-disks having a diameter of 130 to 300mm. Conventional loopers may be arranged in front of and behind the rolling stand group.
The loopers ensure a transition from the preceding and the ;~
subsequent units of the rolling train which does not influence the dimensions of the rolled material itself and the manner of operation of the group of rolling stands.
In accordance with another advantageous feature, in the passes of the first and second rolling stand of the group of rolling stands, the contours of the bottom portions of the grooves forming the passes are approximately oval and adjacent the bottom portion and extending toward the outer edges of the groove, the contour is a straight line and the straight contours of opposing rolls in each stand include an acute angle with each other.
~ ~ a The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and rorming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated .. `. .
and described preferred embodiments of the invention.
.,,",,,,""",,",........
''' .'' : ', . ; `'' .
BRIEF DESCRIPTION OF T~E DRAWING
In the drawing~
Fig. 1 is a schematic top view of a rolling stand arrangement according to the present invention; `~
Fig. 2 is a diagram illustrating the relationship between -~
drive motor current and rolling speed; and Figs. 3, 4 and 5 are schematic illustrations of the passes of the rolling stands.
:
DESCRIPTION OF T$E PREFERRED EMBODIMENTS
As illustrated in Fig. 1 of the drawing, rolling stands 1 --and 3 are horizontal stands with cantilever-mounted roll disks 4 ~ ~ -and 5 and the rolling stand 2 arranged between stands 1 and 3 is . : .- . -a vertical stand 2. The roll disks 6 of the vertical stand 2 are also cantilever-mounted, not shown. As is apparent from the drawing, all stands 1, 2 and 3 are arranged closely one behind the other. The stands 1 and 2 are jointly driven by a motor 8 through a gear unit 7 and the stand 3 is driven separately by a ;~
motor 9.
The diagram of Fig. 2 illustrates the pattern of the current `
limitation I~ in dependence on the rolling speed, wherein the . ~ . . .
rolling work WA and the mechanical frictions MR are taken into `~
consideration. In order to avoid an influence on the cross ~ ;
section of the rolled material, the power excess required for ~ -operating the rolling stand is always to be dimensioned smaller than the tensile strength of the rolled material.
Figs. 3, 4 and 5 show the contours of the passes of stands 1, 2 and 3, respectively. In the bottom portions B of the grooves forming the passes of stands 1 and 2, the contours are elliptically oval and the adjacent portions R extending toward the two edges K of the grooves are straight and the straight portions of opposing rolls include an acute angle with each :- . . , ' : : : ~:
"~ ~,"~ ' ,:'., ' , . .^ $~ vn ~) (~
:. .
other, wherein the angle of the straight portion in stand 1 is 30 to 60 relative to the vertical and the angle of the straight portion of the pass in stand 2 is 30 to 60 relative to the horizontal. The finishing pass of stand 3 is a round pass.
The invention is not limited by the embodiments described above which are presented as examples only but can be modified in various ways within the scope of protection defined by the appended patent claims.
,.. , . .. . .. . - :.
BACRGRO D OF T~E INVENTION
1. ~ield of the Iuvention The present invention relates to a method of operation for rolling round sections having predetermined precise finished dimensions in a group of adjustable rolling stands arranged following a wire rolling train and including two-high horizontal, vertical and horizontal rolling stands which are arranged closely one behind the other.
2. Descriptio~ of the Related Art Numerous proposals concerning methods of operation of the above-described type and groups of rolling stands for carrying ;.:
out such methods of operation are known in the art. For example, Brauer "Weiterentwicklungen der Dreiwalzen-Umformblocke", .
[Further Developments of Three-High Shaping Blocks] Stahl und Eisen 112/192, No. 7 discloses the arrangement of three-high - .- .
rolling stands in blocks of three stands. The use of two-high rolling stands with two-sided support of the rolls, also in ;~ :
blocks of three stands, is described in the brochure Morgan :~
:.:
Construction Co. ""TEKISUN BAR SIZING MILL TECHNOLOGY".
The two known methods of operation mentioned above have in common that they operate with relatively low total pass ~ .
2 ;~
~; ,. ~ ' ;;' 2 ~
reductions, i.e, at most approximately 14~, and, as a result, with a limited capacity, and that the groups of rolling stands used in the metXods are of relatively complicated construction, -particularly the roll supports and the roll drives in the blocks of three-roll stands and the stands themselves in all groups of ~ :~
rolling stands, because of the necessary extremely high stand ~:
stiffnesses with spring characteristics of O.004 mm/kN and less ~. ~
and the required high adjustment accuracy. ~ :
.': . . ' , ! , ', ,". , ' - , .
2 1 1 ~
S~MMARY 0~ T~E INVENTION
Therefore, it is the object of the present invention to provide a method of operation and a group of rolling stands of the above-described type which overcomes the disadvantages of the ;-prior art arrangements described above.
In accordance with the present invention, in the first two rolling stands, a significantly greater pass reduction of between 14% and 28% is adjusted and the rolling speed is adjusted in such a way that only a low tension occurs, and in the last rolling -stand, the pass reduction is adjusted to 1% to 5% and the force of the drive of this rolling stand is limit-adjusted in such a '-way that the cross section of the rolled material is not reduced between the last rolling stand and the preceding rolling stand.
It has been found that the method according to the present invention makes it possible to roll good round sections whose ;~
finished dimensions are of comparably good accuracy. ; , ;
The group of rolling stands for carrying out the above-described method of operation may include, in accordance with the present invention, a first motor for jointly driving the first and second rolling stands and a motor with adjustable current -limitation for driving the third r~lling stand.
'~ ,' ' ~.
. ~ ~
In accordance with another feature of the present invention, the value of the stand springiness of the rolling stands of the group can be limited to about 0.001 mm/kN. The rolls may be -~
cantilevered, i.e. mounted with one-sided support, and the rolling stands may be spaced apart from each other by approximately 600 to 750mm. The rolls may be constructed as roll ~-disks having a diameter of 130 to 300mm. Conventional loopers may be arranged in front of and behind the rolling stand group.
The loopers ensure a transition from the preceding and the ;~
subsequent units of the rolling train which does not influence the dimensions of the rolled material itself and the manner of operation of the group of rolling stands.
In accordance with another advantageous feature, in the passes of the first and second rolling stand of the group of rolling stands, the contours of the bottom portions of the grooves forming the passes are approximately oval and adjacent the bottom portion and extending toward the outer edges of the groove, the contour is a straight line and the straight contours of opposing rolls in each stand include an acute angle with each other.
~ ~ a The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and rorming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated .. `. .
and described preferred embodiments of the invention.
.,,",,,,""",,",........
''' .'' : ', . ; `'' .
BRIEF DESCRIPTION OF T~E DRAWING
In the drawing~
Fig. 1 is a schematic top view of a rolling stand arrangement according to the present invention; `~
Fig. 2 is a diagram illustrating the relationship between -~
drive motor current and rolling speed; and Figs. 3, 4 and 5 are schematic illustrations of the passes of the rolling stands.
:
DESCRIPTION OF T$E PREFERRED EMBODIMENTS
As illustrated in Fig. 1 of the drawing, rolling stands 1 --and 3 are horizontal stands with cantilever-mounted roll disks 4 ~ ~ -and 5 and the rolling stand 2 arranged between stands 1 and 3 is . : .- . -a vertical stand 2. The roll disks 6 of the vertical stand 2 are also cantilever-mounted, not shown. As is apparent from the drawing, all stands 1, 2 and 3 are arranged closely one behind the other. The stands 1 and 2 are jointly driven by a motor 8 through a gear unit 7 and the stand 3 is driven separately by a ;~
motor 9.
The diagram of Fig. 2 illustrates the pattern of the current `
limitation I~ in dependence on the rolling speed, wherein the . ~ . . .
rolling work WA and the mechanical frictions MR are taken into `~
consideration. In order to avoid an influence on the cross ~ ;
section of the rolled material, the power excess required for ~ -operating the rolling stand is always to be dimensioned smaller than the tensile strength of the rolled material.
Figs. 3, 4 and 5 show the contours of the passes of stands 1, 2 and 3, respectively. In the bottom portions B of the grooves forming the passes of stands 1 and 2, the contours are elliptically oval and the adjacent portions R extending toward the two edges K of the grooves are straight and the straight portions of opposing rolls include an acute angle with each :- . . , ' : : : ~:
"~ ~,"~ ' ,:'., ' , . .^ $~ vn ~) (~
:. .
other, wherein the angle of the straight portion in stand 1 is 30 to 60 relative to the vertical and the angle of the straight portion of the pass in stand 2 is 30 to 60 relative to the horizontal. The finishing pass of stand 3 is a round pass.
The invention is not limited by the embodiments described above which are presented as examples only but can be modified in various ways within the scope of protection defined by the appended patent claims.
,.. , . .. . .. . - :.
Claims (8)
1. A method of operation for rolling round sections having predetermined precise finished dimensions in a group of rolling stands arranged following a rolling train and including a first adjustable two-high horizontal rolling stand, a second adjustable two-high vertical rolling stand and a last adjustable two-high horizontal rolling stand, the method comprising carrying out a pass reduction of between 14% and 28% within the first and second rolling stands and adjusting a rolling speed of the first and second rolling stands such that only a small tension occurs in the rolled section, adjusting a pass reduction of 1% of 5% in the last rolling stand and controlling a driving force of the last rolling stand such that a cross sectional size of the rolled section is not reduced between the last rolling stand and a rolling stand preceding the last rolling stand.
2. A group of rolling stands for rolling round sections having predetermined precise finished dimensions, the group comprising at least a first adjustable two-high horizontal rolling stand, a second adjustable two-high vertical rolling stand and a third adjustable two-high horizontal rolling stand, wherein the first and second rolling stands have a pass reduction of between 14% to 28% and the third rolling stand has a pass reduction of 1% to 5%, further comprising a motor for jointly driving the first rolling stand and the second rolling stand, and a motor with adjustable current limitation for driving the third rolling stand.
3. The group of rolling stands according to claim 2, wherein the rolling stands have a spring characteristic of about 0.001mm/kN.
4. The group of rolling stands according to claim 2, wherein the rolling stands have rolls which are cantilever-mounted.
5. The group of rolling stands according to claim 4, wherein the rolls of the rolling stands are roll disks, and wherein each roll disk has a diameter of between 130 and 300mm.
6. The group of rolling stands according to claim 2, wherein the rolling stands are spaced apart from each other by a distance of about 600 to 750mm.
7. The group of rolling stands according to claim 2, further comprising loopers arranged in front of and following the group of rolling stands.
8. The group of rolling stands according to claim 2, wherein each rolling stand has a pair of rolls, the rolls having grooves forming passes, each groove having a bottom portion, a contour of the bottom portion having an approximately elliptically oval shape, the groove further having a straight portion adjacent the bottom portion and extending to an edge of the groove, and wherein oppositely located straight portions of the pair of rolls include an acute angle with each other.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4335218.9 | 1993-10-15 | ||
| DE4335218A DE4335218A1 (en) | 1993-10-15 | 1993-10-15 | Working method for rolling round cross sections of specified precise finished dimensions and roll stand group for its implementation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2118295A1 true CA2118295A1 (en) | 1995-04-16 |
Family
ID=6500253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002118295A Abandoned CA2118295A1 (en) | 1993-10-15 | 1994-10-17 | Method of operation for rolling round sections having predetermined precise finished dimensions and group of rolling stands for carrying out the method |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0648551A1 (en) |
| JP (1) | JPH07178425A (en) |
| KR (1) | KR950010979A (en) |
| CN (1) | CN1106319A (en) |
| CA (1) | CA2118295A1 (en) |
| DE (1) | DE4335218A1 (en) |
| TW (1) | TW291450B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9174255B2 (en) | 2009-06-04 | 2015-11-03 | Siemens Aktiengesellschaft | Energy-saving rolling mill train and energy-saving process for operating a combined casting and rolling station |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1010476A3 (en) * | 1998-12-14 | 2003-09-03 | SMS Demag AG | Roll stand arrangement for the rolling of wire |
| KR100437636B1 (en) * | 1999-12-29 | 2004-06-26 | 주식회사 포스코 | Folding defects removal method of sheet surface |
| CN1108202C (en) * | 2000-08-19 | 2003-05-14 | 林红宇 | Cold rolling technology and equipment for machining reinforcing bar with longitudinal ribs |
| JP4964058B2 (en) * | 2007-08-09 | 2012-06-27 | 株式会社神戸製鋼所 | Wire rod rolling method and tandem rolling apparatus |
| RU2477187C2 (en) * | 2011-06-08 | 2013-03-10 | Открытое акционерное общество "Магнитогорский металлургический комбинат" | Method of automatic control over rolling in continuous train |
| CN112893483B (en) * | 2021-01-27 | 2022-07-08 | 唐山钢铁集团有限责任公司 | Method for preventing strip steel of middle roller way from rising |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1429214A (en) * | 1964-04-11 | 1966-02-18 | Schloemann Ag | Continuous line of rolling mills for small irons or wire, comprising more than three stands |
| JPS60152302A (en) * | 1984-01-19 | 1985-08-10 | Daido Steel Co Ltd | Method for precision rolling of steel bar |
| AU596030B2 (en) * | 1987-10-30 | 1990-04-12 | Morgan Construction Company | Sizing mill and method of rolling a round bar material |
| CA2066475C (en) * | 1991-05-06 | 1997-06-03 | Terence M. Shore | Method and apparatus for continuously hot rolling of ferrous long products |
-
1993
- 1993-10-15 DE DE4335218A patent/DE4335218A1/en not_active Withdrawn
-
1994
- 1994-10-11 TW TW083109373A patent/TW291450B/zh active
- 1994-10-12 JP JP6246384A patent/JPH07178425A/en not_active Withdrawn
- 1994-10-12 EP EP94116034A patent/EP0648551A1/en not_active Ceased
- 1994-10-14 CN CN94117903A patent/CN1106319A/en active Pending
- 1994-10-15 KR KR1019940026459A patent/KR950010979A/en not_active Application Discontinuation
- 1994-10-17 CA CA002118295A patent/CA2118295A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9174255B2 (en) | 2009-06-04 | 2015-11-03 | Siemens Aktiengesellschaft | Energy-saving rolling mill train and energy-saving process for operating a combined casting and rolling station |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4335218A1 (en) | 1995-04-20 |
| CN1106319A (en) | 1995-08-09 |
| EP0648551A1 (en) | 1995-04-19 |
| TW291450B (en) | 1996-11-21 |
| KR950010979A (en) | 1995-05-15 |
| JPH07178425A (en) | 1995-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |