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
  • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
  • B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
• • 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
  • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
  • B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
  • B21D3/05—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes rectangular to the path of the work
• • 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
  • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
  • B21D3/16—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially adapted methods or means
• • 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
  • B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
  • B21B1/088—H- or I-sections
• • 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
  • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
  • C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
  • C21D9/06—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails with diminished tendency to become wavy

Definitions

• the invention relates to a method for straightening profiles having a web and at least one flange, in particular double-T or U-carriers, with the aid of straightening tools.
• Section steel often experiences deformations or warping after hot rolling during the cooling process.
• the profiles are directed after hot rolling and cooling. Since the deformations occur during cooling, so far it has not been satisfactorily possible to straighten the profiles while still warm. Although standardized results can be achieved during the straightening process of the warm profiles, after the final cooling, the profiles partly spring back into a curved, non-standard shape.
• the invention has for its object to provide an improved method available, which makes it possible to judge profiles in the warm state.
• the straightening method according to the invention builds on the basic idea to direct the profiles at profile temperatures of> 70 ° C in such a way that the straightening force is introduced directly into the flange of the profile. Since ⁇ by internal stresses are avoided in the profile, which otherwise generate deformations during cooling of the profile.
• the straightening force is preferably introduced into the narrow side of the flange, so in a profile with vertically aligned flange from above or below. According to the invention, however, a straightening force need not be introduced in one direction and at one point.
• straightening forces for example via comb-like rollers, both in the lateral "main surface" of the flange and the narrow side of the flange can be introduced, just as they can be introduced only in the lateral "main surface".
• the invention is based on the finding that the change in shape of hot-formed profiles observed in the prior art after cooling lies in the differential heat quantity content of the still-warm profile after cooling.
• the transition region from web to flange (web root) there is a high mass concentration with a low surface area, which cools more slowly compared to the adjacent masses. As a result, it has a higher temperature than the rest of the profile. Forming influences in the further cooling process change the temperature and can generate temperature-dependent voltage distributions.
• profiles are directed with a web and at least one flange.
• Such profiles are especially T-
• the profiles are directed at profile temperatures of over 70 ° C, especially preferred at temperatures above 100 ° C.
• the method according to the invention also makes it possible to straighten at higher temperatures, for example also at about 200 ° C. and more.
• the term profile temperature may include, for example, the root canal surface temperature as well as the root canal temperature.
• it can also comprise the surface temperature of the web as well as the carrier edges or the temperature in these profile elements.
• the profile temperature can also be determined by including the temperature of several of these profile elements. For example, the profile temperature can be determined by measuring the temperature profile in the entire profile or by measuring the temperature in some of the profile elements.
• a frequently used method for determining the profile temperature is, for example, temperature scanning.
• the temperature is detected by means of a movably arranged temperature measuring device via the support edge, the web root, the web and again the other web root and other support edge. From the measured temperature profile, the profile temperature is determined, the temperatures in the land roots can be weighted more. As a profile temperature can therefore be understood according to the invention, the result of such a temperature scanning.
• the straightening forces are introduced into the flange via an outer surface of the straightening tool which is angular with respect to the surface of the flange on which this straightening tool acts.
• Such a device is described for example in DE 195 25 513 A1, the full disclosure of which is given for the description of a device on which the inventive method, for example, can be performed, and for the description of the manner in which straightening forces can be introduced into the flange is included in the present application.
• the straightening tools in particular straightening discs, at least partially frusto-conical and transmit the straightening force with its conical lateral surface on the flange.
• the straightening tools can be arranged above and / or below the straightening material.
• the angle of inclination of the effective lateral surface is preferably of the order of magnitude of the angle of friction between the lateral surface and the surface against which the straightening tool acts; it then results from the following equation:
• the angle of inclination is preferably 5 °.
• the point of intersection of the generatrices of the non-drive straightening disk is preferably remote from the drive and the point of intersection of the straightening disk near the drive is close to the drive.
• the straightening discs preferably have flange-supporting surfaces which are located on the web side and / or the web-facing side of the flange. Accordingly, trained as straightening straightening tools preferably a U-shaped or T-shaped axial cross-section. The flange-supporting surfaces each engage alternately outside and inside the flange.
• straightening disks with a chamber-like axial cross section are suitable.
• Such a straightening disk then consists, preferably in one piece, of individual disks between which the inventive lateral surfaces which are inclined relative to the horizontal are located and whose lateral surfaces support the flange or web in the straightening position on one or both sides.
• straightening tools must be provided with the effective lateral surface.
• the inlet side straightening tools can be arranged with angularly extending with respect to the directional axis effective lateral surface.
• a correspondingly configured straightening tool or pair of tools above and below the straightening material in mutual proximity is sufficient in each case.
• straightening tools configured in such a way only in the discharge area can be arranged.
• the mantle or inclined surfaces used with the method according to the invention allow a maximum of directional accuracy when straightening the warm profiles. In particular, they avoid the occurrence of flange upsets and outward bulges in the area of the flange edges and preserve the favorable residual stress state of the non-directional profile resulting from the hot rolling of the profiles.
• FIG. 1 is a schematic representation of a preferably used with the inventive method straightening device with an upper straightening disk pair partially in an axial longitudinal section
• Fig. 8 shows a part of the straightening bush according to Fig. 7 in an enlarged view
• Fig. 9 is a cylindrical straightening sleeve.
• the straightening device consists of a drive 1, not shown in detail in its individual parts, to which a shaft 2 is connected, on which two straightening disks 3, 4 are arranged above a double-T carrier 5.
• This has a web 5a and two flanges 5b and 5c.
• the straightening disks 3, 4 have-in the axial direction-a T-shaped cross-section and consist of a circular disk-shaped part 6 which engages on the inside of the two flanges but does not touch the web of the flange, which merges into a frustoconical projection 7.
• the frustoconical projections 7 are with their small diameter surfaces. 8 each directed to the outside and are edges on their lateral surfaces in frictional connection with the flange.
• the lateral surface or line 9 extends at an angle p with respect to the surface of the narrow side of the flange or onto the horizontal or the spacer bushes 10.
• the spacer bushes 10 serve to set the distance between the leveling wheels and the profile height (flange distance). of the carrier to be addressed. Accordingly, between the generatrix 9 and the narrow side surface of the flanges of the inclusion angle p.
• the height Z of the frusto-conical projections is dimensioned such that the narrow sides of the flanges are supported over their entire height.
• the straightening disks 11, 12 of FIGS. 3 and 4 are arranged and constructed in basically the same way as in the case of FIGS. 1, 2; However, they support the flanges on the outside and have conical approach surfaces 7, whose large diameter surfaces 13 point inward or face each other. In this way results between the lateral surfaces or lines 9 and the horizontal or the narrow sides of the support flanges respectively the same inclusion angle as in the straightening disks 3.4 of FIG. 1, 2nd
• the straightening rollers 15,16 of FIGS. 5, 6 consist of several, preferably integrally interconnected flange-supporting individual discs 17,18,19,20, between each of which a frustoconical transition 21, 22,23 is located. In this way, resulting between the discs 16 to 20 grooves 24,25,26 for receiving the flanges of carriers with different dimensions.
• the suitable for carrying out the method according to the invention for hot straightening straightening need not be fully equipped with the angular straightening tools (straightening discs or bushes); rather, it is sufficient if these are arranged in the region of the greatest bending amplitudes, that is to say on the inlet side, which would also lead to the greatest upsetting or dimensional deviations without the straightening tool according to the invention.
• all upper straightening tools may be formed as discs or multi-disc roles when judging with large pitch (distance between two adjacent straightening axes) and correspondingly small straightening forces below the straightening cylindrical straightening jacks 28 may be arranged ranging from flange to flange.
• FIGS. 7 to 9 show further variants of the devices which can be used with the method according to the invention. Identical elements are identified by the same reference numbers.
• the illustrated devices allow the direct introduction of force into the flange of a profile, thereby also the straightening of hot profiles, which have a temperature above 70 °, is possible.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Straightening Metal Sheet-Like Bodies (AREA)
• Shaping Of Tube Ends By Bending Or Straightening (AREA)
• Forging (AREA)
• Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
• Heat Treatment Of Steel (AREA)
• Heat Treatment Of Strip Materials And Filament Materials (AREA)
• Processes Specially Adapted For Manufacturing Cables (AREA)
• Conveying And Assembling Of Building Elements In Situ (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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Cited By (1)

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• 2003
  • 2003-06-30 DE DE10329525A patent/DE10329525B4/de not_active Expired - Fee Related
• 2004
  • 2004-06-29 ES ES04740428T patent/ES2285476T3/es not_active Expired - Lifetime
  • 2004-06-29 UA UAA200600769A patent/UA85557C2/ru unknown
  • 2004-06-29 DE DE502004003891T patent/DE502004003891D1/de not_active Expired - Fee Related
  • 2004-06-29 JP JP2006516082A patent/JP2009513352A/ja active Pending
  • 2004-06-29 AT AT04740428T patent/ATE362809T1/de not_active IP Right Cessation
  • 2004-06-29 WO PCT/EP2004/007037 patent/WO2005000495A1/fr not_active Ceased
  • 2004-06-29 US US10/562,747 patent/US20080202187A1/en not_active Abandoned
  • 2004-06-29 PL PL04740428T patent/PL1641575T3/pl unknown
  • 2004-06-29 KR KR1020057025297A patent/KR20060033743A/ko not_active Withdrawn
  • 2004-06-29 CN CNB2004800184300A patent/CN100364682C/zh not_active Expired - Fee Related
  • 2004-06-29 EP EP04740428A patent/EP1641575B1/fr not_active Expired - Lifetime
  • 2004-06-29 RU RU2006102511/02A patent/RU2366526C2/ru not_active IP Right Cessation

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