GB2309185A - Stress relief of metal strip - Google Patents

Stress relief of metal strip Download PDF

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Publication number
GB2309185A
GB2309185A GB9600862A GB9600862A GB2309185A GB 2309185 A GB2309185 A GB 2309185A GB 9600862 A GB9600862 A GB 9600862A GB 9600862 A GB9600862 A GB 9600862A GB 2309185 A GB2309185 A GB 2309185A
Authority
GB
United Kingdom
Prior art keywords
strip
predetermined
change
metal
processing
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Withdrawn
Application number
GB9600862A
Other versions
GB9600862D0 (en
Inventor
Bernd Junker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Laird Holdings Ltd
Original Assignee
Draftex Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Draftex Industries Ltd filed Critical Draftex Industries Ltd
Priority to GB9600862A priority Critical patent/GB2309185A/en
Publication of GB9600862D0 publication Critical patent/GB9600862D0/en
Priority to EP96307976A priority patent/EP0785286A1/en
Priority to CZ974A priority patent/CZ497A3/en
Publication of GB2309185A publication Critical patent/GB2309185A/en
Withdrawn legal-status Critical Current

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
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
    • B21B41/08—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters without overall change in the general direction of movement of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0242—Flattening; Dressing; Flexing
    • 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
    • B21B1/30—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 non-continuous process
    • 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
    • B21B1/30—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 non-continuous process
    • B21B1/32—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/36—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by cold-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/22—Hardness

Description

1 2309185 APPARATUS AND METHODS FOR PROCESSING METAL The invention relates
to apparatus and methods for processing metal. Apparatus and methods to be described by way of example in more detail below are for use in thinning (that is, reducing the thickness of) elongated metal strip. Such metal strip may be used, after further processing, for producing reinforcing cores or carriers for sealing, trimming and guiding strips; however, they may be used for many other applications as well.
According to the invention, there is provided a method of processing elongate metal strip, comprising the steps of transporting the metal tape longitudinally while subjecting it to successive changes in angular direction in opposite senses whereby to increase its temperature and relax its structure to reduce work-hardening.
According to the invention, there is further provided a method for producing elongate metal strip of a predetermined thickness, comprising the steps of passing metal strip of initial thickness greater than the predetermined thickness longitudinally through the bight between two rollers which is less than the initial /1 2 thickness and thereafter subjecting the strip to successive changes in direction of opposite angular senses at such rates of change and with such extent of change as to heat the metal sufficiently to offset the effect of the thickness reduction of the strip on its elongation capability.
According to the invention, there is also provided apparatus for processing an elongate metal strip, comprising means for transporting the metal strip in a first predetermined direction along a predetermined path, and change of direction means in the predetermined path defining at least first and second successive changes in angular direction in opposite senses, the changes in direction being of such rate and of such extent as to increase the temperature of the metal of the strip by a predetermined amount sufficient to relax its structure.
Apparatus and methods according to the invention for use in thinning metal tape will now be described, by way of example only, with reference to the accompanying diagrammatic drawings in which:
Figure 1 is a perspective view of a metal core or carrier for reinforcing a sealing, trimming or guiding strips which may be 3 used in vehicle construction; Figure 2 is a plan view of elongate metal tape f or use in producing the carrier of Figure 1; Figure 3 is a side view of the tape of Figure 2 showing how its thickness is reduced; Figure 4 is a side view of one form of the apparatus; Figure 5 is an enlarged view of part of the apparatus of Figure 4 for explaining its operation; Figure 6 is a side view of a modified form of the apparatus of Figure 4; and Figure 7 is a side view of a further modified form of the apparatus of Figure 4.
The metal carrier 5 (Figure 1) is of channel-shape and in this example is made up of U-shaped elements 6 joined integrally together by short connecting links 8. Using a known cross-head extrusion process, this channel-shaped carrier is incorporated 4 into extruded flexible material such as plastics or rubber material to form a channel-shaped sealing, trimming or guiding strip for use in motor vehicle body construction. The metal carrier is formed by producing transverse slits at controlled positions in elongate metal strip or tape and then stretching the slit metal tape longitudinally so as to expand the slits into slots 9 (see Figure 1), these slots thus producing the U- shaped elements and the integral connecting links shown in Figure 1. Such a slitting and stretching process may be carried out continuously using a rotary machine. The metal carrier is then covered with extruded flexible material (plastics or rubber material, normally) using a cross-head extrusion process, either before or after the metal carrier has been formed into channelshape. The metal tape used to produce the carrier in this way may be 0.5mm thick and 25mm wide, for example.
It will be understood that the process of slitting and stretching the metal tape to produce the carrier requires the metal tape to have certain characteristics. In particular, it must be capable of being stretched by the required amount, in order to convert the slits into slots, without fracturing. This in turn means that the process for producing the metal tape must not have workhardened it, or otherwise affected it, so that the required :11 stretching cannot be carried out easily and effectively. It is found that it must be possible to stretch the metal tape (during the process of making the carrier) by at least 3%.
The process of making the metal tape involves the selection of metal tape having an initial width (w) and thickness (t) of, say 25mm and 3mm respectively (Figures 2 and 3). The metal tape manufacturer then subjects this tape to a thinning process which reduces its thickness from 3mm to 0. 5mm (for example), as required by the sealing strip manufacturer. Figure 3 shows how this thinning process is carried out by the metal tape manufacturer. The metal tape 10 is passed longitudinally in the direction of the arrow A through two rollers 12 and 14 whose spacing is accurately controlled so as to reduce the thickness of the tape 10 as it passes through the bight of the rollers. The bight between the rollers is adjusted to reduce the thickness from 3mm to some lesser value between 3mm and the required final value of 0.5mm. The spacing between the rollers 10,12 is then reduced further and the tape re-passed between them to effect a further reduction in thickness. This process is repeated again until the required final thickness of 0.5mm (in this example) is achieved.
6 1 This process of thinning the metal tape by passing it between the rollers 10,12 tends to work-harden the metal. Unless steps are taken to rectify this, the resultant metal tape will be unsatisfactory for the sealing strip manufacturer; the workhardening of the tape will make it impossible for it to be longitudinally stretched sufficiently and effectively - it will tend to break or rupture.
In order to reduce the effect of this work-hardening of the thinned metal tape, it is known to heat the thinned metal tape so as to relax its structure and eliminate or substantially reduce the work-hardening effect. Thus, a coil of the thinned metal tape may be heated to a predetermined temperature in an enclosure free of oxygen (to eliminate oxidation effects). However, such a heating process is expensive and time-consuming and therefore uneconomic.
Figure 4 illustrates one form of the apparatus and method according to the invention for thinning-down metal tape.
The apparatus comprises a support 20 for rotatably supporting a drum 22 of the metal tape 10. The metal tape is drawn from the drum 22 and passes through the thinning rollers 12,14 (see Figure 7 3). Thence it passes partially around guide rollers 24,26 and 28 to a receiving drum 30 which is rotatably mounted on a further support 32. The drum 30 is rotated by means of a suitable motor (not shown) and thus draws the tape in the direction of the arrow A. As already explained in connection with Figure 3, the spacing between the rollers 12 and 14 is adjusted to produce the required thinning-down of the metal of the tape. The metal tape may be passed one or more times through the apparatus. Thus, on completion of a first pass, the filled drum 30 is then removed from support 32 and placed on support 22 and the process repeated. This is carried on until the required final thickness is achieved.
Figure 5 explains the purpose and action of the additional guide rollers 24,26 and 28. In Figure 5, rollers 24 and 26 are shown with the metal tape 10 passing around them, the thickness of the metal tape being metal tape passes on the outside of tension while the will be subjected take place over compression will exaggerated for explanatory purposes. As the around the rollers, the portion of the metal the bends thus produced will be subjected to portion of the metal on the inside of the bends to compression. In more detail, tension will the regions indicated at 33 and 34, while take place over the regions indicated at 36 and 1 8 38. Obviously, a similar effect will take place as the tape 10 passes around roller 28 (not shown in Figure 5). Because of the high speed with which the tape is passed around the rollers, this alternate tension and compression will warm the metal and thus relax its structure and eliminate or reduce any work-hardening effect caused by the thinning rollers 12,14. In this way, the work-hardening is eliminated or reduced continuously as part of the thinning down process and without any need to carry out a separate heating step as explained above.
improvement is thus produced.
A substantial economic In a modification shown in Figure 6 (in which the supports 20 and 32 and the drums 22 and 30 are omitted for clarity), the apparatus of Figure 4 is provided with a further set of guide rollers (24A,26A,28A) corresponding to the rollers 24,26 and 28 but on the opposite side of the pair of thinning rollers 12,14. The roller 26,26A in each set of such guide rollers is made vertically movable in the directions of the arrows B. Thus each set of guide rollers can be brought into or out of operation by raising or lowering its respective guide roller 26,26A. Thus, guide roller 26A is lowered substantially towards the rollers 24A and 28A (as shown in the Figure) while the tape passes in the direction of arrow A so that the tension and compression effects 9 described with reference to Figure 5 are produced only by the set of guide rollers 24,26,28. After the tape 10 has completed its movement in the direction of the arrow A, the set of guide rollers 24,26 and 28 shown in that Figure is put out of operation (by lowering the roller 26). The other set of guide rollers is then brought into operation by raising its guide roller 26A. The tape is then passed in the opposite direction back to the drum 22 (by means of an appropriate drive motor not shown). In this way, therefore, the apparatus of Figure 4 is made reversible.
Figure 7 illustrates how the apparatus of Figure 4 can be modified so as to be incorporated as part of the apparatus for producing the sealing strip. Parts in Figure 7 corresponding to parts in Figure 4 are correspondingly referenced. In this case, the set of guide rollers 24,26, 28 is augmented by two further guide rollers 40,42 to provide an increased relaxation effect on the metal of the tape af ter it has been passed through the thinning rollers 12,14. The metal tape is then passed directly into the apparatus (indicated diagrammatically at 44) for slitting and stretching the tape to produce the metal carrier and then embedding it in the extruded material. In this way, the metal tape with its initial thickness (of, say, 3mm) is thinned down to the required final thickness (of 0.5mm, say), converted into a metal carrier and covered with the extruded material, all in a continuous process.
The apparatus of Figure 4 or Figure 6 can be modified by incorporating the additional rollers 40,42, in the or each set of guide rollers.
Tests have shown that passing the metal tape around the guide rollers in the manner explained with reference to Figures 4 to 7 can increase by as much as 40% the extent to which the metal tape can be elongated or stretched during the process of manufacturing the metal carrier.
However, although the apparatus and methods described above have been described with reference to producing metal tape for use in manufacturing metal carriers for sealing, trimming or guiding strips, the apparatus and methods are not of course limited to such an application. The apparatus and methods can be used for producing elongate metal strip for any other desired application.
11

Claims (19)

1. A method of processing elongate metal strip, comprising the steps of transporting the metal tape longitudinally while subjecting it to successive changes in angular direction in opposite senses whereby to increase its temperature and relax its structure to reduce work-hardening.
2. A method according to claim 1, in which the step of subjecting the strip to the said changes in angular direction comprises the steps of feeding the strip longitudinally in a first predetermined direction, changing the first direction by a predetermined angular extent and in a first predetermined angular sense into a second direction and then changing the second direction by a predetermined angular extent and in a second predetermined angular sense opposite to the first predetermined angular sense into a third direction, the angular extents and the rates of change of angular sense being such that the required increase in temperature is achieved.
3. A method according to claim 2, including the step of receiving the strip in the third direction and changing its 12 direction by a predetermined angular extent and in the f irst angular sense into a fourth direction.
4. A method according to claim 3, in which the first and fourth directions are substantially the same.
5. A method for producing elongate metal strip of a predetermined thickness, comprising the steps of passing metal strip of initial thickness greater than the predetermined thickness longitudinally through the bight between two rollers which is less than the initial thickness and thereafter subjecting the strip to successive changes in direction of opposite angular senses at such rates of change and with such extent of change as to heat the metal sufficiently to offset the effect of the thickness reduction of the strip on its elongation capability.
6. A method according to any preceding claim, including the further step of producing predetermined transverse slits in the strip and thereafter elongating the strip to convert the slits into slots, whereby to produce a longitudinal metal reinforcement for a sealing, trimming or guiding strip.
7. Apparatus for processing an elongate metal strip, comprising means for transporting the metal strip in a first predetermined direction along a predetermined path, and change of direction means in the predetermined path defining at least first and second successive changes in angular direction in opposite senses, the changes in direction being of such rate and of such extent as to increase the temperature of the metal of the strip by a predetermined amount sufficient to relax its structure.
8.- Apparatus according to claim 7, in which the change of direction means also defines a third change of angular direction of opposite sense to the second change of direction.
9. Apparatus according to claim 7 or 8, in which each change of direction means comprises a respective guide roller.
10. Apparatus according to any one of claims 7 to 9, including a pair of processing rollers mounted in the predetermined path upstream of the change of direction means with reference to the first predetermined direction, the processing rollers being mounted on opposite sides of the said path so that the path passes through the bight between them, the spacing between the pair of rollers being less than the thickness of the strip 14 upstream of the processing rollers so that the thickness of the strip is reduced in passing between them, the said predetermined amount of increase in temperature being sufficient to offset the effect of the thickness reduction on the elongation capability of the metal strip.
11. Apparatus according to claim 10, including further change of direction means corresponding to the first-mentioned change of direction means, the two change of direction means being mounted in the predetermined path with the pair of processing rollers between them, each change of direction means including control means for selectively bringing it into and out of operation, and including means for transporting the metal strip along the predetermined path in the direction opposite to the first predetermined direction, the control means bringing only the first-mentioned change of direction means into operation when the strip is moving in the first predetermined direction and only the second change of direction means into operation when the strip is moving in the opposite direction.
12. Apparatus according to any one of claims 7 to 10, comprising processing means positioned downstream of the change of direction means for processing the strip to convert it into a metal carrier for a sealing, trimming or guiding strip.
13. Apparatus according to claim 12, in which the processing means comprises means for producing predetermined transverse slits in the metal strip and then stretching the strip to convert the slits into slots.
14. A method of processing a metal strip, substantially as described with reference to Figures 4 and 5 of the accompanying drawings.
15. A method of processing a metal strip, substantially as described with reference to Figures 5 and 6 of the accompanying drawings.
16. A method of processing a metal strip, substantially as described with reference to Figure 7 of the accompanying drawings.
17. Apparatus for processing a metal strip, substantially as described with reference to Figures 4 and 5 of the accompanying drawings.
16
18. Apparatus for processing a metal strip, substantially as described with reference to Figures 5 and 6 of the accompanying drawings.
19. Apparatus for processing a metal strip, substantially as described with reference to Figure 7 of the accompanying drawings.
GB9600862A 1996-01-16 1996-01-16 Stress relief of metal strip Withdrawn GB2309185A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB9600862A GB2309185A (en) 1996-01-16 1996-01-16 Stress relief of metal strip
EP96307976A EP0785286A1 (en) 1996-01-16 1996-11-04 Apparatus and methods for rolling and stress relaxing a metal strip
CZ974A CZ497A3 (en) 1996-01-16 1997-01-03 Process and apparatus for working metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9600862A GB2309185A (en) 1996-01-16 1996-01-16 Stress relief of metal strip

Publications (2)

Publication Number Publication Date
GB9600862D0 GB9600862D0 (en) 1996-03-20
GB2309185A true GB2309185A (en) 1997-07-23

Family

ID=10787113

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9600862A Withdrawn GB2309185A (en) 1996-01-16 1996-01-16 Stress relief of metal strip

Country Status (3)

Country Link
EP (1) EP0785286A1 (en)
CZ (1) CZ497A3 (en)
GB (1) GB2309185A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2072556A (en) * 1980-04-02 1981-10-07 Head Wrightson Mach Rolling and flattening strip
GB2197233A (en) * 1986-10-15 1988-05-18 Bwg Bergwerk Walzwerk Rolling of metal strip
WO1994006577A1 (en) * 1992-09-16 1994-03-31 Bolder Battery, Inc. Thin lead film rolling apparatus and method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3247946A (en) * 1962-10-30 1966-04-26 American Can Co Method of treating metal
US3429164A (en) * 1966-04-08 1969-02-25 Armco Steel Corp Method of processing ferrous strip
JPS52837B2 (en) * 1973-05-31 1977-01-11
JPS571504A (en) * 1980-06-04 1982-01-06 Mitsubishi Heavy Ind Ltd Rolling method
JPS5994504A (en) * 1982-11-22 1984-05-31 Hitachi Ltd Plate mill
FR2641719B1 (en) * 1989-01-19 1994-09-09 Mesnel Sa Ets METHOD FOR MANUFACTURING A METAL FRAME FOR PROFILES OF RESILIENT SYNTHETIC MATERIAL

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2072556A (en) * 1980-04-02 1981-10-07 Head Wrightson Mach Rolling and flattening strip
GB2197233A (en) * 1986-10-15 1988-05-18 Bwg Bergwerk Walzwerk Rolling of metal strip
WO1994006577A1 (en) * 1992-09-16 1994-03-31 Bolder Battery, Inc. Thin lead film rolling apparatus and method

Also Published As

Publication number Publication date
CZ497A3 (en) 1998-08-12
GB9600862D0 (en) 1996-03-20
EP0785286A1 (en) 1997-07-23

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