CA2033961A1 - Method and arrangement for producing a predetermined yield strength and surface roughness of metal strip - Google Patents
Method and arrangement for producing a predetermined yield strength and surface roughness of metal stripInfo
- Publication number
- CA2033961A1 CA2033961A1 CA 2033961 CA2033961A CA2033961A1 CA 2033961 A1 CA2033961 A1 CA 2033961A1 CA 2033961 CA2033961 CA 2033961 CA 2033961 A CA2033961 A CA 2033961A CA 2033961 A1 CA2033961 A1 CA 2033961A1
- Authority
- CA
- Canada
- Prior art keywords
- roll stand
- tension
- rolling
- metal strip
- arrangement
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/05—Stretching combined with rolling
-
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/28—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
- B21B39/08—Braking or tensioning arrangements
-
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B2001/228—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 plates, strips, bands or sheets of indefinite length skin pass rolling or temper rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/14—Roughness
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method and an arrangement for producing a pre-determined yield strength and surface roughness during skin pass rolling of pretreated metal strip. The metal strip is subjected under predetermined strip tensions to a hardening pass and the roughness is subsequently rolled onto the strip.
A method and an arrangement for producing a pre-determined yield strength and surface roughness during skin pass rolling of pretreated metal strip. The metal strip is subjected under predetermined strip tensions to a hardening pass and the roughness is subsequently rolled onto the strip.
Description
2~3~6~
. ..
..,: ...~
BACKGROUND OF THE INVENTION
~ ~' 1. Field of the Invention The present invention relates to a method for producing a predetermined yield strength and surface roughness during skin pass rolling of pretreated metal strip. The invention also relates to an arrangement for carrying out the method.
2. Description of the Related Art For the treatment of metal strip and particularly strip of steel alloys, strip treatment plants are known in which one or more treatment units are followed by a skln pass rolling stand in the form of a two-high stand, four-high stand or cluster roll stand. The treatment units are arrangements for the chemical treatment, for cleaning and degreasing, for annealing and thermal treatment, for coating with metal coatings such as tin, zinc, aluminum or the like, for applying paints, varnishes or photo-chemical layers on metal strips. Such skin pass rolling stands are frequently also called temper pass rolling stands.
~ .
The skin pass rolling stand has the purpose of adjusting the strip materia} to a predetermined yield strength by performing a specific strain hardening treatment.
Simultaneously, a defined roughness is to be imparted by the .~
... ., . . ... - . . .. . . . .
2 ~ ~ 3 .~
rolls onto the s~rip surface. In this connection, it is a problem that metal strips of different steel qualities are rolled to an increasing extent in the same line. For example, the steel may be relatively soft, e.g., extra deep-drawing quality steel with yield points of approximately 140 to 180 N/mm2 and higher strength steels with yield points of ~-approximately 300 to 600 N/mm2. In the case of conventional strip thicknesses of about 0.4 to 0.8 mm and strip widths of up to 2000 mm, only four-high rolling mill stands can be used for the desired strain-hardening treatment. In dependence upon the respective metal strips, these four-high rolling mill stands are operated with rolling forces of about 600 t in the case of strip thicknesses of more than 1.0 mm and with rolling forces of up to about 1500 t in the case of strip thicknesses of less than 1.0 mm, i.e., in the case of thin metal strips. However, the soft qualitiest particularly the extra deep-drawing qualities, may only be subjected to a low strain hardening treatment, particularly since they have a deep cold work hardening or strain-hardening characteristic.
For example, a four-high rolling mill stand may be operated for such metal strips only with a rolling force of 50 to 100 t and only specially roughened rolls may be used for obtaining the desired roughness. However, these rolls lose their roughness due to the contact with the back-up rolls and, therefore, must be frequently exchanged. As a result, particularly in continuously operating plants, large strip 2 ~ u~ c) ~
storage units are required on the entry side and on the exit ;~
side for bridging the exchange periods.
;
Another problem resides in the fact that a large control range is required for the four-high rolling mill stand for hydraulically adjusting the rolling force. For example, in ;~
the case of metal strips to be rolled hard, hydraulic pressures of 250 bar at a rolling force of 1500 t are required, while hydraulic pressures of only 8 to 16 bar may ~ -~
be used in the case of soft metal strip, such as, extra deep-drawing strip. Control pressure variations of approximately ~/- 1 bar in power-assisted valves result in one situation in a folding force control deviation of +/- 0.4 %, while in the other case they mean a control deviation of ~/- 12.5% or +/- 6.25% and the attendant different cold work hardening and roughness degrees in the same metal strip.
~ For thcse reasons, it is not possible to obtain a well `~
defined yield strength and simultaneously a well defined, ~;
uniform surface roughness in metal strip of different qualities.
It is a primary object of the present disclosure to provide a method and an arrangement for producing a well defined yield strength and simultaneously a producing a wcll de~incd yield strength and sirultaneously a 2 ~ 'J t.J ~" ~
well defined surface roughness during skin pass rolling of pretreated metal strip of different qualities.
As here described, the method for producing a predetermin~d yield strength and surface roughness during skin pass rolling of preheated metal strips includes rolling the metal strip under predetermined tension in a hardening pass and/or subsequently rolling the roughness onto the strip with continuous strip travel.
Within the scope of this disclosure, roughness means a certain surface conditioning.
The desired yield strength and surface roughness can be obtained in two treatment steps which are independent of each other but subseguent to each other while the metal strip travels continuously. In fact, it is now possible to adjust and control the rolling force in an optimum manner for soft metal strip as well as for hard metals strip. In the case of deep-drawing qualities, the hardening pass can be omitted and the surface conditioning with roughened rolls can be carried out at low rolling pressures.
We have found that the adjustable tensions have a significant influence on the rolling degree and, thus, also on the strain hardening and roughness of the strip material. This is cf particular significance when the :
.
"~
2~ 3~
hardening pass is omitted in the case of extra deep-drawing qualities.
':
The arrangement for carrying out the method ~ -includes at least one set of tension rolls on the entry side and a set of tension rolls on the exit side for continuously traveling metal strip and a cluster roll stand, particularly a four-high roll stand, for rolling a hardening pass, the cluster roll pass being arranged between the two sets of tension rolls. The improvement resides in a two-high roll stand for rolling the roughness arranged between the cluster roll stand and the set of tension rolls on the exit side.
Thus, the skin pass rolling stand of conventional strip treatment plants is divided into a cluster roll stand for the hardening pass and a two-high roll stand for carrying out surface conditioning.
: .
In accordance with another feature, a tension measuring device each is provided in ~ront of the cluster roll stand, the subsequent two-high roll stand and the set of tension~rolls on the exit side and the drives of the ~cluster roll stand, the two-high roll stand and the set of tension rolls on the exit side are guided by the respective tension measuring devices. This makes it possible, on the one hand, to compensate the elongation of ' ''' ' ~.. :. : . . . . : , :. :
~3.~
the respective metal strip in the individual por~ions which elongation cannot be exactly measured; on the other hand, the strip tensions can be adjusted in front of an behind the rolling mill stands within wide limitsl so that it is possible in this manner to influence tlle rolling deyree and, thus, the strain hardening and roughness of the strip material.
In accordance with an advantageous feature, the set of ; -~
tension rolls on the entry side is the guiding drive or speed master.
,.
It is also possible to arrange a roll leveling machine each following the cluster roll stand and the two-high roll stand. For example, when the operation is for extra deep-drawing propertiesthrough the tension measuring with low back tension and low forward tension with the cluster roll stand being open, then the set of tension rolls on the exit side operates the corresponding leveling machine in a pulling action and applies the bending 109ses thereof.
In accordance with a first aspect of the invention there is provided in a method for producing a predetermined yield strength and surface roughness during skin pass rolling of pretreated metal strip, the improvement comprising subjecting ~
the metal strip under predetermined strip tension to a ~ -hardening pass and/or subsequently rolling the roughness.
In accordance with a second aspect of the invention there is provided in an arrangement for producing a predetermined . . , . , , ~ , . . . . . .
: `
2~33~
yield strength and surface roughness of pretreated metal strip, the arrangement including at least one set of tension rolls on an entry side and a set of tension rolls on an exit side for continuously traveling metal strip and a cluster roll stand ~or rolling a hardening pass arranged between the two sets of tension rolls, the improvement comprising a two high roll stand for rolling the roughness arranged between the cluster roll stand and the sets of tension rolls on the exit side.
Embodiments o~ the invention will now be described with reference to the accompanying drawings wherein:
Fig. 1 is a schematic side view of the arrangement embodying the present invention; and Fig. 2 is a schematic side view of the arrangement of Fig. 1 including leveling machines.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The figures of the drawing show an arrangement for producing a predetermined yield strength and surface roughness during the skin pass rolling of pretreated metal strip 1. The arrangement includes essentially at least one set of tension rolls 2 on the entry side and a set of tension rolls 5 on the exit side for the continuously traveling metal strip 1 and a cluster roll stand 3, particularly a four-high roll stand, for rolling a hardening pass. The cluster roll stand 3 is arranged betwesn the two sets of tension rolls 2, 5. A two-high roll stand 4 for rolling the roughness is ;
~` arranged between the cluster roll stand 3 and the ~et of tension rolls 5 on the exit side. Tension measuring devices ~':' ' '"
, 8 "
~`
'':' :.
- 2~33~
Tl, T2, T3 are arranged in front of the cluster roll stand 3, the subsequent two-high roll stand 4 and the set of tension :~
rolls 5 on the exit side, respectively. The drives of ~;-cluster roll stand 3, two-high roll stand 4 and set of tension rolls 5 on the exit side are driven or guided by the ~ :
respective tension measuring devic~s Tl, T2, T3. The sets of tension rolls 2 on the entry side operate as speed master.
The cluster roll stand 3 and the two-high roll stand 4 are each followed by a roll leveling machine 6, 7.
' The operation for hard metal strip is as follows:
a) adjusting back tension through tension measuring device T1, b) rolling hardening pass by means of cluster roll stand 3, ;
c) adjusting back tension for the two-high roll stand 4 through tension measuring device T2, ~:-' d) adjusting forward tension for the two high rolling stand 4 to tension measuring device T3, and e) rolling roughness by means of two-high roll stand 4.
2 ~ 3 ~
In addition to the power re~uired for rolling and the :~
bearing losses, the drive of the roll stands 3, 4 also absorbs the difference between forward tension and bac~ tension. The tension distribution may be, for example:
back tension to cluster roll stand 312 t forward tension to cluster roll stand 3 4 t `
back tension to two-high roll stand 44 t forward tension to two-high roll stand 4 2 t For soft metal strip, for example, extra deep-drawing properties, the operation may be as follows:
.. a) cluster roll~stand 3 is open, b) back tension for two~high stand 4 from tension measuring device T2, c) forward tension for two-high roll stand 4 from tension measuring device T3, wherein tension adjustment, for example, back tension to two high roll stand 4: 3 t forward tension to two-high roll stand 4: 1.5 t . . .
: . .
;
2~33~
, ~: .
When the above arrangement and manner of operation are used, the yield point of the extra deep-drawing material is only slightly increased, so that the deformability is maintained. In the case of large roll diameters of the two-high roll stand 4 and low strip tensions and low rolling forces of, for example, 70 to 100 t, the cold deformation is approximately 0.3 to 0.5 %. The roughness of the rolls is imparted well to the metal strip 1.
In the case of higher strength metal strips 1, rolling.
forces of about 250 to 300 t are required in the two-high roll stand 4 for applying the roughness. With a maximum pressure of 250 bar, the control deviation is `~
in soft metal strips 1, rolling force 70 t at -84 bar ~/-1.1 %, .
in hard metal strip 1, rolling force 300 t at 250 bar ~/- 0.4%
Thus, the rolling force can be well adjusted and controlled even in the case of soft metal strip 1.
2~3~
While a speciflc embodiment of the invention has been shown and described in detail to illustrate the application of the inventive principle, it will be understood that the invention may be embodied otherwise without departing from such principle~. .
. ..
..,: ...~
BACKGROUND OF THE INVENTION
~ ~' 1. Field of the Invention The present invention relates to a method for producing a predetermined yield strength and surface roughness during skin pass rolling of pretreated metal strip. The invention also relates to an arrangement for carrying out the method.
2. Description of the Related Art For the treatment of metal strip and particularly strip of steel alloys, strip treatment plants are known in which one or more treatment units are followed by a skln pass rolling stand in the form of a two-high stand, four-high stand or cluster roll stand. The treatment units are arrangements for the chemical treatment, for cleaning and degreasing, for annealing and thermal treatment, for coating with metal coatings such as tin, zinc, aluminum or the like, for applying paints, varnishes or photo-chemical layers on metal strips. Such skin pass rolling stands are frequently also called temper pass rolling stands.
~ .
The skin pass rolling stand has the purpose of adjusting the strip materia} to a predetermined yield strength by performing a specific strain hardening treatment.
Simultaneously, a defined roughness is to be imparted by the .~
... ., . . ... - . . .. . . . .
2 ~ ~ 3 .~
rolls onto the s~rip surface. In this connection, it is a problem that metal strips of different steel qualities are rolled to an increasing extent in the same line. For example, the steel may be relatively soft, e.g., extra deep-drawing quality steel with yield points of approximately 140 to 180 N/mm2 and higher strength steels with yield points of ~-approximately 300 to 600 N/mm2. In the case of conventional strip thicknesses of about 0.4 to 0.8 mm and strip widths of up to 2000 mm, only four-high rolling mill stands can be used for the desired strain-hardening treatment. In dependence upon the respective metal strips, these four-high rolling mill stands are operated with rolling forces of about 600 t in the case of strip thicknesses of more than 1.0 mm and with rolling forces of up to about 1500 t in the case of strip thicknesses of less than 1.0 mm, i.e., in the case of thin metal strips. However, the soft qualitiest particularly the extra deep-drawing qualities, may only be subjected to a low strain hardening treatment, particularly since they have a deep cold work hardening or strain-hardening characteristic.
For example, a four-high rolling mill stand may be operated for such metal strips only with a rolling force of 50 to 100 t and only specially roughened rolls may be used for obtaining the desired roughness. However, these rolls lose their roughness due to the contact with the back-up rolls and, therefore, must be frequently exchanged. As a result, particularly in continuously operating plants, large strip 2 ~ u~ c) ~
storage units are required on the entry side and on the exit ;~
side for bridging the exchange periods.
;
Another problem resides in the fact that a large control range is required for the four-high rolling mill stand for hydraulically adjusting the rolling force. For example, in ;~
the case of metal strips to be rolled hard, hydraulic pressures of 250 bar at a rolling force of 1500 t are required, while hydraulic pressures of only 8 to 16 bar may ~ -~
be used in the case of soft metal strip, such as, extra deep-drawing strip. Control pressure variations of approximately ~/- 1 bar in power-assisted valves result in one situation in a folding force control deviation of +/- 0.4 %, while in the other case they mean a control deviation of ~/- 12.5% or +/- 6.25% and the attendant different cold work hardening and roughness degrees in the same metal strip.
~ For thcse reasons, it is not possible to obtain a well `~
defined yield strength and simultaneously a well defined, ~;
uniform surface roughness in metal strip of different qualities.
It is a primary object of the present disclosure to provide a method and an arrangement for producing a well defined yield strength and simultaneously a producing a wcll de~incd yield strength and sirultaneously a 2 ~ 'J t.J ~" ~
well defined surface roughness during skin pass rolling of pretreated metal strip of different qualities.
As here described, the method for producing a predetermin~d yield strength and surface roughness during skin pass rolling of preheated metal strips includes rolling the metal strip under predetermined tension in a hardening pass and/or subsequently rolling the roughness onto the strip with continuous strip travel.
Within the scope of this disclosure, roughness means a certain surface conditioning.
The desired yield strength and surface roughness can be obtained in two treatment steps which are independent of each other but subseguent to each other while the metal strip travels continuously. In fact, it is now possible to adjust and control the rolling force in an optimum manner for soft metal strip as well as for hard metals strip. In the case of deep-drawing qualities, the hardening pass can be omitted and the surface conditioning with roughened rolls can be carried out at low rolling pressures.
We have found that the adjustable tensions have a significant influence on the rolling degree and, thus, also on the strain hardening and roughness of the strip material. This is cf particular significance when the :
.
"~
2~ 3~
hardening pass is omitted in the case of extra deep-drawing qualities.
':
The arrangement for carrying out the method ~ -includes at least one set of tension rolls on the entry side and a set of tension rolls on the exit side for continuously traveling metal strip and a cluster roll stand, particularly a four-high roll stand, for rolling a hardening pass, the cluster roll pass being arranged between the two sets of tension rolls. The improvement resides in a two-high roll stand for rolling the roughness arranged between the cluster roll stand and the set of tension rolls on the exit side.
Thus, the skin pass rolling stand of conventional strip treatment plants is divided into a cluster roll stand for the hardening pass and a two-high roll stand for carrying out surface conditioning.
: .
In accordance with another feature, a tension measuring device each is provided in ~ront of the cluster roll stand, the subsequent two-high roll stand and the set of tension~rolls on the exit side and the drives of the ~cluster roll stand, the two-high roll stand and the set of tension rolls on the exit side are guided by the respective tension measuring devices. This makes it possible, on the one hand, to compensate the elongation of ' ''' ' ~.. :. : . . . . : , :. :
~3.~
the respective metal strip in the individual por~ions which elongation cannot be exactly measured; on the other hand, the strip tensions can be adjusted in front of an behind the rolling mill stands within wide limitsl so that it is possible in this manner to influence tlle rolling deyree and, thus, the strain hardening and roughness of the strip material.
In accordance with an advantageous feature, the set of ; -~
tension rolls on the entry side is the guiding drive or speed master.
,.
It is also possible to arrange a roll leveling machine each following the cluster roll stand and the two-high roll stand. For example, when the operation is for extra deep-drawing propertiesthrough the tension measuring with low back tension and low forward tension with the cluster roll stand being open, then the set of tension rolls on the exit side operates the corresponding leveling machine in a pulling action and applies the bending 109ses thereof.
In accordance with a first aspect of the invention there is provided in a method for producing a predetermined yield strength and surface roughness during skin pass rolling of pretreated metal strip, the improvement comprising subjecting ~
the metal strip under predetermined strip tension to a ~ -hardening pass and/or subsequently rolling the roughness.
In accordance with a second aspect of the invention there is provided in an arrangement for producing a predetermined . . , . , , ~ , . . . . . .
: `
2~33~
yield strength and surface roughness of pretreated metal strip, the arrangement including at least one set of tension rolls on an entry side and a set of tension rolls on an exit side for continuously traveling metal strip and a cluster roll stand ~or rolling a hardening pass arranged between the two sets of tension rolls, the improvement comprising a two high roll stand for rolling the roughness arranged between the cluster roll stand and the sets of tension rolls on the exit side.
Embodiments o~ the invention will now be described with reference to the accompanying drawings wherein:
Fig. 1 is a schematic side view of the arrangement embodying the present invention; and Fig. 2 is a schematic side view of the arrangement of Fig. 1 including leveling machines.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The figures of the drawing show an arrangement for producing a predetermined yield strength and surface roughness during the skin pass rolling of pretreated metal strip 1. The arrangement includes essentially at least one set of tension rolls 2 on the entry side and a set of tension rolls 5 on the exit side for the continuously traveling metal strip 1 and a cluster roll stand 3, particularly a four-high roll stand, for rolling a hardening pass. The cluster roll stand 3 is arranged betwesn the two sets of tension rolls 2, 5. A two-high roll stand 4 for rolling the roughness is ;
~` arranged between the cluster roll stand 3 and the ~et of tension rolls 5 on the exit side. Tension measuring devices ~':' ' '"
, 8 "
~`
'':' :.
- 2~33~
Tl, T2, T3 are arranged in front of the cluster roll stand 3, the subsequent two-high roll stand 4 and the set of tension :~
rolls 5 on the exit side, respectively. The drives of ~;-cluster roll stand 3, two-high roll stand 4 and set of tension rolls 5 on the exit side are driven or guided by the ~ :
respective tension measuring devic~s Tl, T2, T3. The sets of tension rolls 2 on the entry side operate as speed master.
The cluster roll stand 3 and the two-high roll stand 4 are each followed by a roll leveling machine 6, 7.
' The operation for hard metal strip is as follows:
a) adjusting back tension through tension measuring device T1, b) rolling hardening pass by means of cluster roll stand 3, ;
c) adjusting back tension for the two-high roll stand 4 through tension measuring device T2, ~:-' d) adjusting forward tension for the two high rolling stand 4 to tension measuring device T3, and e) rolling roughness by means of two-high roll stand 4.
2 ~ 3 ~
In addition to the power re~uired for rolling and the :~
bearing losses, the drive of the roll stands 3, 4 also absorbs the difference between forward tension and bac~ tension. The tension distribution may be, for example:
back tension to cluster roll stand 312 t forward tension to cluster roll stand 3 4 t `
back tension to two-high roll stand 44 t forward tension to two-high roll stand 4 2 t For soft metal strip, for example, extra deep-drawing properties, the operation may be as follows:
.. a) cluster roll~stand 3 is open, b) back tension for two~high stand 4 from tension measuring device T2, c) forward tension for two-high roll stand 4 from tension measuring device T3, wherein tension adjustment, for example, back tension to two high roll stand 4: 3 t forward tension to two-high roll stand 4: 1.5 t . . .
: . .
;
2~33~
, ~: .
When the above arrangement and manner of operation are used, the yield point of the extra deep-drawing material is only slightly increased, so that the deformability is maintained. In the case of large roll diameters of the two-high roll stand 4 and low strip tensions and low rolling forces of, for example, 70 to 100 t, the cold deformation is approximately 0.3 to 0.5 %. The roughness of the rolls is imparted well to the metal strip 1.
In the case of higher strength metal strips 1, rolling.
forces of about 250 to 300 t are required in the two-high roll stand 4 for applying the roughness. With a maximum pressure of 250 bar, the control deviation is `~
in soft metal strips 1, rolling force 70 t at -84 bar ~/-1.1 %, .
in hard metal strip 1, rolling force 300 t at 250 bar ~/- 0.4%
Thus, the rolling force can be well adjusted and controlled even in the case of soft metal strip 1.
2~3~
While a speciflc embodiment of the invention has been shown and described in detail to illustrate the application of the inventive principle, it will be understood that the invention may be embodied otherwise without departing from such principle~. .
Claims (6)
1. In a method for producing a predetermined yield strength and surface roughness during skin pass rolling of pretreated metal strip, the improvement comprising subjecting the metal strip under predetermined strip tension to a hardening pass and/or subsequently rolling the roughness.
2. In an arrangement for producing a predetermined yield strength and surface roughness of pretreated metal strip, the arrangement including at least one set of tension rolls on an entry side and a set of tension rolls on an exit side for continuously traveling metal strip and a cluster roll stand for rolling a hardening pass arranged between the two sets of tension rolls, the improvement comprising a two-high roll stand for rolling the roughness arranged between the cluster roll stand and the sets of tension rolls on the exit side.
3. The arrangement according to claim 2, wherein the cluster roll stand is a four-high roll stand.
4. The arrangement according to claim 2, wherein a tension measuring device each is provided in front of the cluster roll stand, in front of the two-high roll stand and in front of the sets of tension rolls on the exit side, and wherein the cluster roll stand, the two-high roll stand and drives being guided by the corresponding tension measuring devices.
5. The arrangement according to claim 2, wherein the set of tension rolls on the entry side is a speed master of the arrangement.
6. The arrangement according to claim 2, wherein a roll leveling machine each is arranged following the cluster roll stand and the two-high roll stand.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP90100562.9 | 1990-01-12 | ||
| EP90100562A EP0436762A1 (en) | 1990-01-12 | 1990-01-12 | Method and apparatus for achieving a predetermined yield point and surface roughness during cold-laminating of metallic pre-treated strips |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2033961A1 true CA2033961A1 (en) | 1991-07-13 |
Family
ID=8203482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2033961 Abandoned CA2033961A1 (en) | 1990-01-12 | 1991-01-10 | Method and arrangement for producing a predetermined yield strength and surface roughness of metal strip |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0436762A1 (en) |
| CA (1) | CA2033961A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL9400674A (en) * | 1994-04-27 | 1995-12-01 | Hoogovens Groep Bv | Device and method for manufacturing DKG strip steel. |
| DE19831480C1 (en) * | 1998-07-14 | 2000-01-13 | Schloemann Siemag Ag | Process for presetting cold forming plants |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2306792A (en) * | 1939-06-15 | 1942-12-29 | Carl E Moore | Method of treating annealed strip steel |
| US2287380A (en) * | 1940-10-15 | 1942-06-23 | Clarence J Klein | Metal rolling |
| FR1563057A (en) * | 1968-02-16 | 1969-04-11 | ||
| US3619881A (en) * | 1969-01-17 | 1971-11-16 | United States Steel Corp | Cold rolling work roll |
| FR2488532A1 (en) * | 1980-08-18 | 1982-02-19 | Indre Forges Basse | METHOD OF RULE-NARROW NUTS ROLLING FOR SOFT STEEL REINFORCED SOFT BANDS |
| DE3203581A1 (en) * | 1982-02-03 | 1983-08-11 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh, 4100 Duisburg | METHOD AND DEVICE FOR PRODUCING METAL STRIP FROM WARM STRIP, ESPECIALLY WARM BROAD STRIP |
| DE3635088A1 (en) * | 1986-10-15 | 1988-04-28 | Bwg Bergwerk Walzwerk | METHOD AND ROLLING MILL FOR PRODUCING METAL STRIP IN A ROLLING PROCESS |
-
1990
- 1990-01-12 EP EP90100562A patent/EP0436762A1/en not_active Withdrawn
-
1991
- 1991-01-10 CA CA 2033961 patent/CA2033961A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP0436762A1 (en) | 1991-07-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |