EP2140952B1 - A method of roll-forming a pallet rack upright - Google Patents

A method of roll-forming a pallet rack upright Download PDF

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Publication number
EP2140952B1
EP2140952B1 EP09163793A EP09163793A EP2140952B1 EP 2140952 B1 EP2140952 B1 EP 2140952B1 EP 09163793 A EP09163793 A EP 09163793A EP 09163793 A EP09163793 A EP 09163793A EP 2140952 B1 EP2140952 B1 EP 2140952B1
Authority
EP
European Patent Office
Prior art keywords
bends
uprights
roll
roll forming
forming
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.)
Active
Application number
EP09163793A
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German (de)
French (fr)
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EP2140952A3 (en
EP2140952A2 (en
Inventor
Lars Ingvarsson
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Ortic AB
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Ortic AB
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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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B96/00—Details of cabinets, racks or shelf units not covered by a single one of groups A47B43/00 - A47B95/00; General details of furniture
    • A47B96/14—Bars, uprights, struts, or like supports, for cabinets, brackets, or the like
    • A47B96/1466—Bars, uprights, struts, or like supports, for cabinets, brackets, or the like with longitudinal grooves
    • A47B96/1475—Bars, uprights, struts, or like supports, for cabinets, brackets, or the like with longitudinal grooves and perforations
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
    • B21D5/083—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers for obtaining profiles with changing cross-sectional configuration

Definitions

  • the invention deals with a way of roll forming, from a flat blank of preselected width and in a single roll forming machine, pallet rack uprights of omega type, suitable for different loading situations.
  • Pallet rack uprights of so-called omega type are known, e.g., from WO89/05595 . Loading situations for different pallet racks vary greatly and they often come in a number of standard designs. For each standard upright there is a roll forming set of rolls and the sets between the manufacture of different pallet rack uprights are changed. Optimising a pallet rack upright for a specific application is costly, since a new roll forming set of rollers has to be made.
  • One purpose of the invention is to enable roll forming of pallet rack uprights which is adapted to different load situations without having to change the roll sets. This is achieved by combining the following steps:
  • the pallet rack upright 10 shown in Fig. 2 is shown symmetrical, but can also be asymmetrical in certain cases, and it consists of a central flange 11 with a centre groove 12 and two webs 13,14.
  • the centre groove consists of two S-bends 15,16 and an intervening straight part 17.
  • Each web has an indentation 18 consisting of an S-bend 19, a straight section 20 and an outward pointing flange 21.
  • Between the centre flange 11 and webs 13,14 are corners 22,23, shown as being right-angled.
  • the straight section 20 of the two indentations 18 has a series of holes 25 as shown by Fig. 1 . Only one of the indentations 18 of the webs is described, since the upright is symmetrical.
  • Figure 3 shows the blank 30, being a flat blank of sheet steel, preferably high-strength steel with a yield limit over 400 MPa.
  • a first roll forming section the two S-bends 15,16 are formed on either side of the middle of the blank.
  • the rolls 31, 32 of the last pair for the S-bend 16 are shown in Fig. 3 .
  • this forming section has four roll pairs on each side for consecutively bending these S-bends from the flat blank.
  • Both sides of the roll forming section are laterally adjustable, for example, in the way shown by US 7,107,807 B2 , so that one can predetermine the width of the centre groove 12 by preselecting the distance of the roll pair and thus the S-bends from the middle of the blank.
  • All roll pairs on each side of the section are mounted on a common support so that all roll pairs are shifted together.
  • the roll pairs produce the same S-bends regardless of the width setting.
  • the roll pairs are adjustable only to accommodate the thickness of the blank, which can vary in a range, e.g., between 1 mm and 4 mm. This adjustment is done by changing the distance between the axles of the rolls in a pair.
  • Figure 4 shows the next step in the roll forming.
  • the two S-bends 19 are formed and the last roll pair 35,36 in this section for forming of the left S-bend is shown in the figure.
  • Figure 5 shows the next step, the forming of the corners (bends) 22,23, which are advisedly right-angled.
  • the two supports of this section are also sideways movable so that the position of the corners can be preselected.
  • this section can have 8 roll pairs.
  • the forming of the corners 22,23 is more critical than the forming of the S-bends 15,16 and 19 and in this case the rolls 37,38 are pointed directly toward the corner, i.e., the axles I and II of the roll pair make a 45 degree angle with the central flange 11 and web 13 or as close to 45 degrees as the geometry allows. Precisely 45 degrees means the adjustment for different thicknesses of blank is precise for both the central flange 11 and the web 13.
  • Figure 4 also shows the rolls directed toward the corners.
  • Figure 2 shows a roll pair which is not slanted, but the forming of the central groove is not critical.
  • the roll pair When the roll pair is slanted, one has corresponding roll pairs on one side mounted after those on the other side, i.e., the roll pairs zig zag in each roll forming section of the machine so that the roll forming occurs alternately at the right and left side.
  • Fig. 6 The two supports in this forming section can have six roll pairs and the figure shows the last pair 39,40. Besides being movable sideways, the roll pair 39,40 can also move vertically.
  • the side flanges 21 are always short, one can roll form them in an intermediate step between the step of Fig. 3 and that shown in Fig. 4 .
  • the length of the side flanges must then be limited, or else they will hinder the roll forming in the step of Fig. 5 . In this case, no roll pair needs to be vertically movable.
  • FIG. 1 shows a junction in a pallet rack with uprights made according to the invention.
  • a front upright 10 of the kind shown in Fig. 2 has two struts 40, 41 braced between the surfaces 25 in Fig. 2 with a bolt 42 through the hole 20 and corresponding holes in the ends of the strut.
  • the strut is in the form of a square tube and one of them is slanted upward/backward and the other is slanted downward/backward, and their other ends are secured in the same fashion in a rear upright.
  • the central flange 11 of the upright is turned forward and has two rows of holes 43,44 in which a beam for support of the pallets can be secured between this upright and the upright(s) alongside it.
  • the two square tubes will be adapted to the distance between the two surfaces 25 of the upright on the web and the tube is made in an adjustable roll forming machine in order to fit this distance.
  • the square tubes will withstand strong compression and the screws 42 can be tightened firmly, thereby obtaining larger stiffness than that of known pallet racks.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pallets (AREA)
  • Automatic Assembly (AREA)
  • Warehouses Or Storage Devices (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

Uprights of so-called omega type for pallet racks can be adapted for different loading situations and uprights of different dimensions can be roll formed in a single machine by the following consecutive roll forming steps: - forming of a centre groove (12) consisting of two S-bends (15, 16) that are the same for different uprights, but with preselected distance from the middle of the blank to afford the desired width of the centre groove, - roll forming of two S-bends (19) which are the same for different uprights but with preselected distance from the middle of the blank, and - roll forming of two corners (22, 23) between the S-bends and at preselected distance from the bends of the centre groove to bend upward the webs (13, 14) of the upright. The pallet racks with uprights of omega type have struts of square tubes (41,42) placed alongside each other and clamped together between indentations (18) on both webs of the uprights.

Description

  • The invention deals with a way of roll forming, from a flat blank of preselected width and in a single roll forming machine, pallet rack uprights of omega type, suitable for different loading situations.
    • Background of the invention
  • Pallet rack uprights of so-called omega type are known, e.g., from WO89/05595 . Loading situations for different pallet racks vary greatly and they often come in a number of standard designs. For each standard upright there is a roll forming set of rolls and the sets between the manufacture of different pallet rack uprights are changed. Optimising a pallet rack upright for a specific application is costly, since a new roll forming set of rollers has to be made.
    • Purpose of the invention and brief description thereof
  • One purpose of the invention is to enable roll forming of pallet rack uprights which is adapted to different load situations without having to change the roll sets. This is achieved by combining the following steps:
    • roll forming of a centre groove consisting of two S-bends that are the same for different uprights, but with preselected distance from the middle of the blank to afford the desired width of the centre groove,
    • roll forming of two S-bends which are the same for different uprights but with preselected distance from the middle of the blank, and
    • roll forming of two corners between the S-bends and at preselected distance from the bends of the centre groove. FR 2237762 A shows a roll forming machine for forming pellet uprights with S-bends and corners with laterally fixed rollers.
  • By standardisation of S-bends in this way, one can roll form pallet rack uprights of this kind with desired strength properties for different loading situations by sideways shifting of the various sections for roll forming of the bends in a roll forming machine. In some cases one also needs to adjust the height of the last section's roll pair. A machine with movable sections of roll pairs is known from US 7,107,807 B2 , but a machine for roll forming of pallet rack uprights with constant cross section along the length can be greatly simplified as compared to the more universally applicable machine shown in the patent.
  • When making uprights with different dimensions in this way, one also uses the same principle in a different roll forming machine to make square tubes with dimensions adapted to the particular upright and uses these tubes as diagonal struts between the front and rear uprights in a pallet rack. By easily and quickly adapting the dimensions of both uprights and struts, one can save on weight and costs as compared to making a plurality of standard uprights.
    The invention is defined by the claims.
    • Short description of the drawings.
    • Figure 1 shows a perspective view of a pallet rack upright made according to the invention, with struts that are also fastened to a rear upright.
    • Figure 2 is a cross section of the pallet rack upright of Fig. 1.
    • Figure 3 shows a first roll forming step to make the upright of Figures 1 and 2.
    • Figures 4-6 show subsequent manufacturing steps.
    Description of the sample embodiment shown
  • The pallet rack upright 10 shown in Fig. 2 is shown symmetrical, but can also be asymmetrical in certain cases, and it consists of a central flange 11 with a centre groove 12 and two webs 13,14. The centre groove consists of two S- bends 15,16 and an intervening straight part 17. Each web has an indentation 18 consisting of an S-bend 19, a straight section 20 and an outward pointing flange 21. Between the centre flange 11 and webs 13,14 are corners 22,23, shown as being right-angled. The straight section 20 of the two indentations 18 has a series of holes 25 as shown by Fig. 1. Only one of the indentations 18 of the webs is described, since the upright is symmetrical.
  • The roll forming of the pallet rack upright 10 shown will be described with reference to Figures 3-6.
  • Figure 3 shows the blank 30, being a flat blank of sheet steel, preferably high-strength steel with a yield limit over 400 MPa. In a first roll forming section, the two S- bends 15,16 are formed on either side of the middle of the blank. The rolls 31, 32 of the last pair for the S-bend 16 are shown in Fig. 3. Advisedly, this forming section has four roll pairs on each side for consecutively bending these S-bends from the flat blank. Both sides of the roll forming section are laterally adjustable, for example, in the way shown by US 7,107,807 B2 , so that one can predetermine the width of the centre groove 12 by preselecting the distance of the roll pair and thus the S-bends from the middle of the blank. All roll pairs on each side of the section are mounted on a common support so that all roll pairs are shifted together. The roll pairs produce the same S-bends regardless of the width setting. The roll pairs are adjustable only to accommodate the thickness of the blank, which can vary in a range, e.g., between 1 mm and 4 mm. This adjustment is done by changing the distance between the axles of the rolls in a pair.
  • Figure 4 shows the next step in the roll forming. In this section of the roll forming machine, the two S-bends 19 are formed and the last roll pair 35,36 in this section for forming of the left S-bend is shown in the figure. By parallel sideways shifting of both roll pair supports of the roll forming section, one preselects the position of the S-bends so that they are placed at the desired distance from the middle of the blank. Each support advisedly has six roll pairs.
  • Figure 5 shows the next step, the forming of the corners (bends) 22,23, which are advisedly right-angled. The two supports of this section are also sideways movable so that the position of the corners can be preselected. For example, this section can have 8 roll pairs. The forming of the corners 22,23 is more critical than the forming of the S- bends 15,16 and 19 and in this case the rolls 37,38 are pointed directly toward the corner, i.e., the axles I and II of the roll pair make a 45 degree angle with the central flange 11 and web 13 or as close to 45 degrees as the geometry allows. Precisely 45 degrees means the adjustment for different thicknesses of blank is precise for both the central flange 11 and the web 13. Figure 4 also shows the rolls directed toward the corners. Figure 2 shows a roll pair which is not slanted, but the forming of the central groove is not critical.
  • When the roll pair is slanted, one has corresponding roll pairs on one side mounted after those on the other side, i.e., the roll pairs zig zag in each roll forming section of the machine so that the roll forming occurs alternately at the right and left side.
  • Sometimes no further roll forming is done, and the upright as it appears in Fig. 5 is the end product.
  • Most often side flanges 21 are desired. These are then formed in a final forming step, shown in Fig. 6 . The two supports in this forming section can have six roll pairs and the figure shows the last pair 39,40. Besides being movable sideways, the roll pair 39,40 can also move vertically.
  • As the side flanges 21 are always short, one can roll form them in an intermediate step between the step of Fig. 3 and that shown in Fig. 4. The length of the side flanges must then be limited, or else they will hinder the roll forming in the step of Fig. 5. In this case, no roll pair needs to be vertically movable.
  • Figure 1 shows a junction in a pallet rack with uprights made according to the invention. A front upright 10 of the kind shown in Fig. 2 has two struts 40, 41 braced between the surfaces 25 in Fig. 2 with a bolt 42 through the hole 20 and corresponding holes in the ends of the strut. The strut is in the form of a square tube and one of them is slanted upward/backward and the other is slanted downward/backward, and their other ends are secured in the same fashion in a rear upright. The central flange 11 of the upright is turned forward and has two rows of holes 43,44 in which a beam for support of the pallets can be secured between this upright and the upright(s) alongside it.
  • The two square tubes will be adapted to the distance between the two surfaces 25 of the upright on the web and the tube is made in an adjustable roll forming machine in order to fit this distance. One thus makes uprights with optimised dimensions and tailor-made square tubes as struts for the uprights for a single job order. The square tubes will withstand strong compression and the screws 42 can be tightened firmly, thereby obtaining larger stiffness than that of known pallet racks.

Claims (6)

  1. Method of roll forming, from flat blanks of preselected width and in a single roll forming machine, pallet rack uprights of omega type of different strength suitable for different loading situations, characterised by the combination of the following consecutive steps:
    - forming of a centre groove (12) consisting of two S-bends (15, 16), which are the same for uprights of different strength after preselecting the set distance from the S-bends to the middle of the blank to afford the desired width of the centre groove,
    - roll forming of two S-bends (19), which are the same for uprights of different strength, after preselecting the set distance from these S-bends to the middle of the blank, and
    - roll forming of a corner (22, 23) between the two S-bends on each side of the middle to bend upwards webs (13, 14) of the upright after preselecting the set distance from the corners to the S-bends of the centre groove.
  2. Method according to claim 1, characterised by a further step of roll forming of an outwardly directed flange (21) at preselected distance from the edge of the blank.
  3. Method according to claim 2, characterised in that said further step is a final step.
  4. Method according to any one of the preceding claims, characterised in that the roll forming of the two corners (22,23) is done with slanting roll pairs (37;38).
  5. Method according to claim 4, characterised in that one adjusts the distance between the axles (I, II) of the slanting pair of rolls to the thickness of the blank.
  6. Method according to any one of the preceding claims, characterised in that one carries out the forming of the respective bends and corners alternately on the right and left side of the blank.
EP09163793A 2008-06-30 2009-06-25 A method of roll-forming a pallet rack upright Active EP2140952B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0801535A SE0801535L (en) 2008-06-30 2008-06-30 Way to roll pallet rack posts

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
SE0801535 Previously-Filed-Application 2009-06-25

Publications (3)

Publication Number Publication Date
EP2140952A2 EP2140952A2 (en) 2010-01-06
EP2140952A3 EP2140952A3 (en) 2010-01-13
EP2140952B1 true EP2140952B1 (en) 2011-04-13

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EP09163793A Active EP2140952B1 (en) 2008-06-30 2009-06-25 A method of roll-forming a pallet rack upright

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EP (1) EP2140952B1 (en)
AT (1) ATE505275T1 (en)
DE (1) DE602009001058D1 (en)
SE (1) SE0801535L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE536828C2 (en) * 2012-12-20 2014-09-23 Schneider Electric Ind Sas Method of manufacturing a double anchor rail as well as a single anchor rail manufactured according to the method
CN104001768B (en) * 2013-02-22 2017-05-10 邱澄义 Compression forming machine structure

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124013A (en) * 1964-03-10 Lifting jack supporting bars
FR2237762A1 (en) * 1972-05-13 1975-02-14 Bayer Ag Continuous production of composite elements - is by profiled former with metallic sheets rolled on a core of plastics
NO156354C (en) * 1983-10-25 1987-09-09 Olaf Dalaker DEVICE FOR STEPS FOR SYSTEM RULES.
SE8705075L (en) * 1987-12-18 1989-06-19 Ortic Ab POST FOR SYSTEM SHELVES AND SIMILAR CONSTRUCTIONS
DE69515873D1 (en) * 1995-09-29 2000-04-27 Losey Ltd shelving
US6883278B2 (en) * 2000-03-15 2005-04-26 Ged Integrated Solutions, Inc. Muntin bars
SE521076C2 (en) * 2000-11-29 2003-09-30 Ortic Ab Roll forming machine with removable forming stations
US20040045921A1 (en) * 2002-09-09 2004-03-11 Muller Leslie D. Adjustable shelf storage system
JP3944594B2 (en) * 2002-11-21 2007-07-11 ツカ・カナモノ株式会社 Manufacturing method of steel cross member
US7810770B2 (en) * 2006-05-24 2010-10-12 Treadwell Charles R Storage rack pallet support bar and method of its manufacture

Also Published As

Publication number Publication date
ATE505275T1 (en) 2011-04-15
SE531986C2 (en) 2009-09-22
EP2140952A3 (en) 2010-01-13
SE0801535L (en) 2009-09-22
EP2140952A2 (en) 2010-01-06
DE602009001058D1 (en) 2011-05-26

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