EP0948417A1 - Verfahren und vorrichtung zur walzenkalibrierung eines walzstranges zur herstellung von runden drähten - Google Patents
Verfahren und vorrichtung zur walzenkalibrierung eines walzstranges zur herstellung von runden drähtenInfo
- Publication number
- EP0948417A1 EP0948417A1 EP98934792A EP98934792A EP0948417A1 EP 0948417 A1 EP0948417 A1 EP 0948417A1 EP 98934792 A EP98934792 A EP 98934792A EP 98934792 A EP98934792 A EP 98934792A EP 0948417 A1 EP0948417 A1 EP 0948417A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- caliber
- roll
- rolling
- contour
- radius
- 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.)
- Withdrawn
Links
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
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
Definitions
- the invention relates to a method and a device for the roll calibration of a roll strand within a wire rolling plant, in particular a wire casting and rolling plant, with a plurality of roll sets, each with three rolls per roll stand, to form suitable roll calibers to determine the initial shape of the metal strand by reducing the cross-sectional shape of the metal strand and by further deformation stages or Convert the sequence of rolling passes into a round end shape.
- DE 34 45 219 A1 cites a procedure for roll calibration in which the incoming roll train passes through a plurality of triangular-shaped roll calibres arranged one behind the other to form the desired final shape within the roll pass sequence and finally a finished caliber, each of which is formed by an arrangement of three rolls, the caliber cross-sections of the triangular rolling calibers are dimensioned such that the round finished caliber is filled by the material flow that occurs during the deformation.
- the third-last, triangular-shaped rolling caliber forms a hexagonal rolling-stock cross section, which in the subsequent triangular-shaped rolling caliber is formed into a triangular-shaped rolling stock cross-section, which then runs through the circular finished caliber.
- a calibration is known (DE 2448 158), in which the pressed area of the three-roll caliber is approximated to the pressed area of a six-roll caliber by a special design of the caliber contours.
- the caliber contours of the rollers are bulged at certain points.
- JP 61-46305 A two-roll caliber arrangement is known for the production of pipes, in which the roll caliber contour has special radii around the wall thickness to reduce the pipes.
- the contour of each roller is formed by three different radii.
- a caliber contour for a two-roll caliber arrangement is also known, which is formed by two different caliber radii (JP 1-284411 (A)). This solution is intended to avoid pipe defects.
- Roll calibrations for wire rolling plants are known in practice.
- several sets of rolls, each with three rolls, are arranged one after the other as a so-called roll pass sequence in order to bring the roll strand from the initial shape into the desired final shape, which should have the highest possible roundness for round wires.
- the three rolls in the three-roll arrangement per roll stand form a roll caliber with which a cross-sectional reduction or a roll pass is carried out.
- the individual calibers have a predetermined shape in the deformation and rolling pass sequence, one of these rolling calibers also being able to serve as a preliminary caliber for round wires or other shaped calibers. If the rolling calibers are designed with too large basic radii, there will be insufficient fill levels for the individual rolling calibers up to the finished caliber. Different degrees of filling of the final calibers adversely affect the roundness of the wires.
- the invention had for its object to provide a method for roll calibration of a roll strand for the production of round wires, with which it is possible to influence the material flow so that the finished caliber is completely filled and wires can be produced with a high roundness, which the applicable manufacturing standards according to EN 1715-1 with regard to permissible roundness deviations are significantly below. Furthermore, a device suitable for carrying out the method is to be created.
- a hexagonal roll caliber as well as a final triangular roll caliber and a round finished caliber are to be arranged as a minimum number.
- the hexagonal roll caliber is formed by a corresponding caliber contour of the three rolls.
- the last triangular rolling caliber in the rolling pass sequence before the round finished caliber is the pre-caliber.
- the pre-caliber contour of each roller of the pre-caliber is formed by a radius r Vk , which is 1.05 D to 1.5 D, where D is the nominal wire diameter.
- the point of penetration for the radius ry k lies on the central axis of the roll gap opposite the contour and is set back by an amount of 40 to 85% of the nominal wire diameter D from the center of the caliber in the direction of the roll gap.
- the contour formed by the radius ry ⁇ merges on both sides into a caliber outlet contour with a radius r Vka that is 0.1 D to 0.3 D.
- the roll gap width sy k which is 0.07 to 0.15 D, is formed by the caliber outlet contour between two adjacent rolls.
- the finished caliber contour of each roll of the finished caliber is formed by a radius r k , which is 1.6 to 2% smaller than half the nominal wire diameter D and whose puncture point on the center axis of the roll gap opposite the contour on the contour side of the roll caliber shape outside the Mill quay center lies.
- the penetration point is determined by the distance of the radius r k from the intersection between the extended straight line of the roll gap and the circular arc determined by the nominal wire diameter.
- the contour formed by the radius r k merges on both sides into a caliber outlet contour with a radius r Fka that is 0.06 D to 0.15 D.
- the nip width sp k which is 0.06 to 0.15 D, is formed by the caliber outlet contour between two adjacent rolls.
- the cross-sectional reduction between the cross-sectional area of the pre-caliber and the cross-sectional area of the finished caliber is 10 to 30%.
- a plurality of hexagonal and triangular rolling calibers can also be arranged in front of the round finished caliber in the rolling pass sequence, the hexagonal and triangular rolling calibres being arranged alternately and the rolling pass sequence starting with a hexagonal rolling caliber. The last triangular rolling caliber before the round finished caliber is then the pre-caliber. The other triangular rolling calibers that lie in front of the pre-caliber have the same cross-sectional shape as the pre-calibers.
- the only difference consists only in the dimensions for the radii of the caliber contours, which are inevitably larger by a certain amount in the opposite direction to the rolling pass sequence, depending on the diameter reduction to be achieved in the rolling pass sequence.
- Due to the special design of the triangular rolling calibers the material flow direction is influenced from the outside in so that the subsequent rolling caliber achieves the highest possible degree of filling.
- the wire emerging from the finished caliber is characterized by a particularly high roundness.
- Fig. 4 is a sketch as a half section to determine the puncture point for the radius rp k and
- Fig. 5 shows the last two rolling calibers in the rolling pass sequence as a front view.
- the sequence of rolling passes is shown in simplified form when three sets of rolls are arranged for roll calibration.
- the arrangement of three sets of rolls represents the minimum roll pass sequence of a roll calibration.
- the roll strand 1 coming from the continuous casting plant is deformed in the roll pass sequence in the first hexagonal-shaped roll caliber 5a, which is formed by the corresponding caliber contours of the three rolls 2, to form a hexagonal roll section with a corresponding cross-sectional reduction .
- the displaced areas of the rolling train are marked with position 3.
- the rolling strand emerging from the hexagonal-shaped rolling caliber 5a passes through a triangular-shaped rolling caliber as the preliminary caliber 5b in the subsequent rolling pass sequence. This pre-caliber is formed by the caliber contours of the three rollers 4.
- the rolling strand emerging from the triangular pre-caliber 5b runs through the round finished caliber 5c, which is formed by the corresponding caliber contours of the three rollers 8.
- the rolls stored in the respective roll stands are set in rotation by a drive unit (not shown in detail) with the associated gear ratios in accordance with the rolling pass sequence at a predetermined speed in the processing direction of the casting roll strand.
- the triangular pre-caliber 5b is formed by the three rollers 4, each roller 4 having an arcuate pre-caliber contour 6 which is formed by the radius r Vk .
- the puncture point P v for the radius r Vk is located on the central axis M of the roll gap 7 opposite the respective pre-caliber contour 6.
- the radius ry is larger than the predetermined nominal wire diameter D and is dependent of the nominal wire diameter between 1.05 D and 1.5 D.
- the penetration point P v for the radius r Vk is set back by an amount of 40 to 85% of the nominal wire diameter D from the center of the caliber in the direction of the roll gap 7.
- the pre-caliber contour 6 formed by the radius ry k merges in the region of the roll gap into a caliber outlet contour with a radius ry ka , ry a being 0.1 to 0.3 D.
- the penetration point for the radius ry a is arranged as a transition radius from the pre-caliber contour 6 to the roll gap 7 in such a way that a tangentially flowing transition results.
- FIG. 3 shows the finished caliber 5c which is formed by the three rolls 8.
- the finished wire rod with the desired nominal diameter D emerges from the finished caliber 5c.
- Each roller 8 of the finished caliber 5c has an arcuate finished caliber contour 9, which is formed by the radius r Fk .
- the radius rp is 1.6 to 2% smaller than half the nominal wire diameter D.
- the puncture point Pp for this radius rp lies on the central axis M 'of the opposite finished-caliber contour 9 Roll gap 10.
- the required puncture point Pp is determined in advance on a computer simulation model and explained below with reference to FIG. 4. Between the two nips 10, a circular arc 11 with the radius D / 2 is drawn, where D is the nominal wire diameter.
- the puncture point Pp for the radius r Fk lies on the central axis M 'of the circular arc 11.
- the Distance between the center of the circular arc 11 and the intersection P forms the measure of the radius rp k .
- the respective puncture point Pp for the contour of each roller 8 of the finished caliber lies on the central axis M 'of the roll gap 10 opposite the circular arc 11 or the finished caliber contour 9, which is determined by the distance of the radius rp k from the intersection point P. Based on the determined puncture point Pp and the known radius r Fk , the desired finished caliber contour 9 can then be formed for each roller 8 of the finished caliber 5c.
- the finished-caliber contour 9 merges on both sides into a caliber run-out contour with a radius r Fka , in a manner analogous to that already explained for the pre-caliber.
- the radius r Fka is 0.06 to 0.15 D and the nip width s Fk is also 0.06 to 0.15 D.
- FIG. 5 shows the pre-caliber 5b and the finished caliber 5c of the last two rolling calibers of the rolling pass sequence.
- the shape of the pre-caliber is designed according to the invention such that, according to FIG. 5, an overfilled finished caliber 5c with the transitions of the contours from r Fk to r Fka would have to be produced, the nominal wire diameter D at these points by the amount X should be too big. This does not occur due to the inward flow of the material.
- the dimension for X is chosen depending on the size of the nominal wire diameter D so that the transition between r Fk and r Fka is minimally undershot or exactly achieved.
- the roundness of a wire produced in this way measured according to the test specification according to EN 1715-1, is 15 ⁇ 0.1 mm for a wire with a nominal wire diameter of 15 mm. According to the specification of this EN, a roundness deviation of 3% is still permissible, which, based on a wire with a diameter of 15 mm, is a roundness deviation of up to 0.45 mm.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997122980 DE19722980C1 (de) | 1997-06-02 | 1997-06-02 | Verfahren und Vorrichtung zur Walzenkalibrierung eines Walzstranges zur Herstellung von runden Drähten |
DE19722980 | 1997-06-02 | ||
PCT/DE1998/001431 WO1998055242A1 (de) | 1997-06-02 | 1998-05-26 | Verfahren und vorrichtung zur walzenkalibrierung eines walzstranges zur herstellung von runden drähten |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0948417A1 true EP0948417A1 (de) | 1999-10-13 |
Family
ID=7831127
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98934792A Withdrawn EP0948417A1 (de) | 1997-06-02 | 1998-05-26 | Verfahren und vorrichtung zur walzenkalibrierung eines walzstranges zur herstellung von runden drähten |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0948417A1 (de) |
AU (1) | AU8431498A (de) |
DE (1) | DE19722980C1 (de) |
WO (1) | WO1998055242A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005038574A1 (de) * | 2005-08-12 | 2007-02-15 | Kocks Technik Gmbh & Co. Kg | Walzgerüst und Walzvorrichtung zum Walzen eines Walzprodukts |
IT201600102472A1 (it) * | 2016-10-12 | 2018-04-12 | Danieli Off Mecc | Dispositivo per la soft reduction di prodotti metallici di sezione tonda |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3561105A (en) * | 1967-06-28 | 1971-02-09 | Southwire Co | Method of producing a hot-formed aluminum base product |
US3517537A (en) * | 1967-09-15 | 1970-06-30 | Southwire Co | Method of hot-forming continuously cast aluminum |
IT1022160B (it) * | 1974-09-20 | 1978-03-20 | Properzi Giulio | Laminatoio continuo del tipo a tre cilindri in particolare per le prime passate di laminazione di un lingotto proveniente da una macchina di colata continua del tipo a routa e nastro |
DE2448158C3 (de) * | 1974-10-07 | 1980-09-04 | Mannesmannroehren-Werke Ag, 4000 Duesseldorf | Auf die Verringerung der Polygonbildung im Rohrinneren ausgerichtete Walzenkalibrierung eines Rohrreduzierwalzwerkes |
DE3445219A1 (de) * | 1984-12-12 | 1986-06-12 | Kocks Technik Gmbh & Co, 4010 Hilden | Walzenkalibrierung fuer kontinuierlich arbeitende stab- und drahtwalzstrassen bzw. -bloecke |
-
1997
- 1997-06-02 DE DE1997122980 patent/DE19722980C1/de not_active Expired - Fee Related
-
1998
- 1998-05-26 EP EP98934792A patent/EP0948417A1/de not_active Withdrawn
- 1998-05-26 WO PCT/DE1998/001431 patent/WO1998055242A1/de not_active Application Discontinuation
- 1998-05-26 AU AU84314/98A patent/AU8431498A/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO9855242A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU8431498A (en) | 1998-12-21 |
DE19722980C1 (de) | 1998-06-04 |
WO1998055242A1 (de) | 1998-12-10 |
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