Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
  • B21C37/15—Making tubes of special shape; Making tube fittings
  • B21C37/155—Making tubes with non circular section
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
  • B21C37/15—Making tubes of special shape; Making tube fittings
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
  • B21B13/005—Cantilevered roll stands
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/16—Adjusting or positioning rolls
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
  • B21B13/06—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged vertically, e.g. edgers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
  • B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B2015/0071—Levelling the rolled product
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
  • B21B2203/22—Hinged chocks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2273/00—Path parameters
  • B21B2273/22—Aligning on rolling axis, e.g. of roll calibers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/16—Adjusting or positioning rolls
  • B21B31/18—Adjusting or positioning rolls by moving rolls axially
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/16—Adjusting or positioning rolls
  • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
  • B21B31/22—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal
  • B21B31/30—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal by wedges or their equivalent

Definitions

• the invention relates to a method and apparatus defined in the preambles of the independent claims for manufacturing oval-shaped metal tubes by means of rolling.
• Oval-shaped tubes are used for example in gas heaters, where the advantage is that the outer surface area of the tube is increased in comparison with the quantity of liquid contained in the tube, as well as a more advantageous circulation for the gas flame in between the tubes than when using round tubes.
• oval-shaped metal tubes are manufactured so that a sheet is worked into a U-shaped profile, which is then closed into a tube by welding at the seam located on the side of the profile.
• An oval-shaped tube can also be manufactured by drawing the tube through an oval-shaped ring and by utilizing mold technique.
• the object of the present invention is to avoid drawbacks of the prior art and to introduce a novel solution for manufacturing an oval tube made of metal.
• oval-shaped metal tubes are manufactured by rolling an essentially round-shaped metal tube both in the transversal and lengthwise directions of the tube, which means that the metal tube is rolled at least in two steps, and in between said rolling steps, the metal tube is rolled at least once in a direction that is transversal to the rolling direction of said rolling steps.
• metal tube is fed into roughing by means of at least two feed rollers guiding the metal tube.
• the employed feed rollers are rollers which, on that surface that gets into contact with the metal tube, have the same shape as the metal tube to be rolled.
• the roughing rollers are biradial on that surface that gets into contact with the metal tube, in which case the formation of the smaller radius in the finishing rollers can preferably be enhanced.
• the seam joint of the top and bottom rollers from the preceding roughing step is prevented from leaving a mark in the tube.
• the employed side rollers are rollers that are straight on the surface that gets into contact with the metal tube.
• the side rollers are used for adjusting the tube straightness in the direction of the larger diameter of the oval tube, and also the shape of the shorter radius of the oval tube is affected.
• the metal tube is rolled into an oval shape at least by two finishing rollers, so that the degree of deformation of the tube is essentially 2 - 3.5%.
• the shape of the finishing rollers essentially corresponds to the oval shape at the surface that gets into contact with the metal tube.
• the metal tube is straightened at least in two directions that are mutually perpendicular by means of at least two straightening rollers. This affects the straightness of the final oval tube.
• the employed straightening rollers are two rollers that are essentially v- grooved on the surface that gets into contact with the metal tube, as well as six latter straightening rollers that are essentially monoradial in surfaces and perpendicular to the former straightening rollers.
• at least the roughing rollers and the finishing rollers are adjusted both in the radial and axial directions.
• the radial adjusting is realized by adjusting the mutual difference of the rollers by using a separate adjusting mechanism. In the axial direction, the adjusting is realized by means of an adjustable locking plate and a ring made of a pneumatic material, both arranged in connection with the roller.
• the side rollers are adjusted both by shape and straightening adjustments.
• the measures of the oval tube are affected, and by means of said mechanisms, it also is possible to perform the adjusting operations for oval tubes of various sizes in a fast and precise fashion.
• the method according to the invention for manufacturing metallic oval tubes is realized by an apparatus that includes rollers for rolling an essentially round-shaped metal tube both in the sideways direction and in the vertical direction, which apparatus comprises at least two sets of rollers arranged on both sides of the metal tube, as well as another set of rollers arranged on both sides of the metal tube in a direction that is perpendicular to the rolling direction defined by the first two sets of rollers.
• FIG. 1a A rolling apparatus according to the invention
• Figures 1 a and 1 b illustrate an apparatus according to the invention for manufacturing oval tube.
• Figure 1b shows the rollers illustrated in figure 1a in a cross-section seen from the direction of the arrow 23.
• a metal tube that is roundish in cross-section and is made of either hard or soft metal, for instance a copper tube, is fed in the rolling apparatus 9 through the feeding step 1 , so that the two feed rollers 10 conforming to the shape of the metal tube 11 keep the metal tube in a given line for the rolling operation.
• the feed rollers may be located either above or underneath the metal tube, or at the sides thereof, and on their surface 17 that gets into contact with the metal tube, they have the same shape as the metal tube.
• the feed rollers 10 feed the metal tube 11 into roughing 2, where the round metal tube is flattened by two roughing rollers 12, so that the final measures of the tube are affected.
• the roughing rollers 12 are located both above and underneath the tube, and are biradial on the surface 18 that gets into contact with the metal tube, i.e. there are distinguished the radii R1 and R2.
• the degree of deformation of the metal tube 11 is 0.5 - 2%. This refers to the difference in weight per one meter between the original tube 8 and the worked metal tube.
• the thickness of the tube wall remains essentially the same throughout the whole roughing process, but the wall circumference is decreased.
• the metal tube 11 is transferred in the line to the next rolling step 3, in which the tube is rolled down in a direction perpendicular to the roughing direction by two side rollers 13 for essentially 1 - 8% of the metal tube width after roughing 2.
• the side rollers 13 are straight.
• the use of the side rollers ensures that the quality requirements for the shorter radius of the oval tube are fulfilled in the final rolling, and in the roughing step it prevents the seam joint of the top and bottom rollers from leaving a mark in the metal tube.
• the side rollers 13 also are used for adjusting the oval tube straightness in the direction of the larger diameter.
• the metal tube is rolled by two finishing rollers 14 located above and underneath the metal tube 11 , so that the metal tube obtains an oval shape, in which case the degree of deformation of the metal tube is 2 - 3.5%.
• the shape of the finishing rollers 14 corresponds to the shape of an oval.
• the metal tube is transferred to the straightening units 5 and 6, where the metal tube 11 is straightened at least from two directions that are perpendicular to each other by means of straightening rollers 15, 16.
• the straightening rollers guide and straighten the tube.
• the employed straightening rollers 15 are two rollers arranged on both sides of the metal tube, said rollers being essentially v-grooved on the surface 21 that gets into contact with the metal tube 11. as well as six latter straightening rollers 16 that are essentially monoradial on the surfaces 22.
• FIG. 2 illustrates how the roughing rollers 12 and the finishing rollers 14 are adjusted both in the radial and in the axial direction.
• the radial adjusting is realized by a rocking lever mechanism 25, which means that the housing element 26 belonging thereto is provided by a slot 27 that enables the moving of the housing element.
• an adjusting mechanism 28 installed in connection with the housing element, the mutual distance of the rollers is adjusted in the vertical direction.
• the adjusting mechanism 28 comprises a wedge 29, a wedge transfer screw 37 and a locking screw 30. When the screws should be shifted nearer to each other, the locking screw 30 is opened, and the wedge 29 is shifted forward by the wedge transfer screw 29, whereafter the locking screw 30 is tightened.
• a given distance in the movement of the adjusting mechanism 28 corresponds to a given distance in the vertical movement of the rollers 14.
• the adjusting demand is 0 - 0.2 millimeters, which means that the difference in the parallelism of the roller axes does not disturb the process.
• the rollers 14 are moved by the axial adjustment.
• the axial adjustment is realized by an adjustable locking plate 31 and a ring 32 made of a pneumatic material, such as rubber, arranged in connection with the roller 14, and by moving said plate and ring, the roller grooves 33 are in the axial direction adjusted to match.
• Figure 3 illustrates the adjusting of the side rollers 13.
• the side rollers 13 are adjusted both by shape adjustment 36 and by straightening adjustment 35.
• the shape adjustment of the side rollers means that the mutual positions of the side rollers can be adjusted, and thus the tube can be worked when necessary.
• the straightening adjustment 35 the side rollers are shifted together in the horizontal direction.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
• Metal Rolling (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=8564801

Family Applications (1)

Country Status (8)

Families Citing this family (8)

Family Cites Families (3)

• 2002
  • 2002-10-22 FI FI20021885A patent/FI113632B/fi active
• 2003
  • 2003-10-09 TW TW092128078A patent/TW200418588A/zh unknown
  • 2003-10-20 MY MYPI20033979A patent/MY138990A/en unknown
  • 2003-10-21 WO PCT/FI2003/000777 patent/WO2004037455A1/en not_active Application Discontinuation
  • 2003-10-21 AU AU2003271792A patent/AU2003271792A1/en not_active Abandoned
  • 2003-10-21 EP EP03753626A patent/EP1554064A1/de not_active Withdrawn
  • 2003-10-21 CN CNB2003801014497A patent/CN1329137C/zh not_active Expired - Fee Related
  • 2003-10-21 KR KR1020057005856A patent/KR20050059237A/ko not_active Application Discontinuation

Non-Patent Citations (1)

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