US3682465A - Work-table on machines for processing metal in sheet or plate form - Google Patents

Work-table on machines for processing metal in sheet or plate form Download PDF

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Publication number
US3682465A
US3682465A US9272A US3682465DA US3682465A US 3682465 A US3682465 A US 3682465A US 9272 A US9272 A US 9272A US 3682465D A US3682465D A US 3682465DA US 3682465 A US3682465 A US 3682465A
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United States
Prior art keywords
work
support element
panel
sheet
processing metal
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Expired - Lifetime
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US9272A
Inventor
Eduard Alexander Hanni
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Haemmerle AG Maschinenfabrik
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Haemmerle AG Maschinenfabrik
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection
    • 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
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0272—Deflection compensating means

Definitions

  • the invention relates to a work-table on machines for processing metal in sheet or plate form, more particularly press brakes.
  • a frequent occurrence in highpressure press brakes is that while a workpiece is being dealt with, the push-rod .bends up and the work-table bends down, with the result that there remains between the top tool and the bottom tool a gap which is larger towards the center than at both ends; machining accuracy is therefore impaired.
  • a centring plate having a curvature strip which is transversely adjustable on a keyway and which is retained at both ends on the bottom part of the centring plate.
  • This system provides fairly accurate compensation for bending, but with the great disadvantage that readjustment is required upon any change of material or tools or pressure.
  • a work-table for a machine for processing metal of the class including sheet and plate, more particularly press brakes, and including a table panel, a support element which corresponds to the length of the table panel mounted in a bottom part and vertically displaceable therein and defining therewith a chamber for receiving oil on which the element will rest.
  • FIG. 1 is a diagrammatic view in cross section of an embodiment of the work-table according to the invention.
  • FIG. 2 is a diagrammatic view of a conventional press brake and associated pressure diagram.
  • FIG. 2 includes a diagrammatic front view of a press brake comprising a ram 1 and a work-table 2.
  • a first tool 3 is disposed on ram 1 and a second tool 4 cooperating with tool 3 rests on table 2.
  • a second tool 4 cooperating with tool 3 rests on table 2.
  • Under load particularly if the load is not evenly distributed, bending may occur in the form indicated by broken lines. This condition is shown in heavy lines in the pressure diagram in FIG. 2, P denoting the pressure and X denoting the place on the work-table.
  • FIG. 1 is a diagrammatic view in section of the new work-table according to the invention, comprising a panel 5 bearing a machining tool 6.
  • Panel 5 rests on a support element 7 extending over the whole length of panel 5 and in cross section resembling an inverted T; element 7 is mounted for vertical displacement in a bottom member 8.
  • the interior thereof in shape corresponds to the element 7, but when the same is in its top end position a space 9 remains free at the bottom of member 8.
  • Space 9 is filled with oil at high pressure; sealing elements 10 on the support element 7 prevent the oil from escaping.
  • a work-table for a machine for processing metal said work-table being subjected to high pressure and including a table panel, and a support element having an inverted T-shape mounted in a bottom part with the head of the T cooperating with abutments on the bottom part to limit upward movement of the support element, said support element also having lateral sealing elements for making sealing engagement with the bottom part and vertically displaceable therein and defining therewith a chamber for receiving oil on which the element will rest.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

A work-table having a table panel, a support element which supports the table panel across a load bearing dimension of the panel, and itself defines over the same dimension with a bottom part an oil chamber the oil in which will support the support element and panel.

Description

United States Patent Hfi'nni is] 3,682,465 [451 Aug. 8, 1972 WORK-TABLE ON MACHINES FOR PROCESSING METAL IN SHEET OR PLATE FORM [72] Inventor: Eduard Alexander l'liinni, Zofingen,
Switzerland [73] Assignee: Hammq'le A.G., Zofingen, Switzerland [22] Filed: Feb. 6, 1970 [21] Appl. No.: 9,272
[30] Foreign Application Priority Data Feb. 18, 1969 Austria ..l606/69 [52] US. Cl ..267/ 130, 267/1 19 [51] Int. Cl ..Fl6f 5/00, F16f 9/00 [58] Field of Search ..267/119, 130
[56] References Cited UNITED STATES PATENTS 2,389,818 11/1945 Rode et a1. ..267/ 1 19 2,918,272 12/1959 Williamson ..267/1 19 3,303,774 2/1967 Shiokawa ..267/1 19 Primary Examiner-Drayton E. Hoffman Att0rney Edwin E. Greigg [57] ABSTRACT 1 Claim, 2 Drawing Figures PATENTED 8 1973 J snzn um IN VEN TOR.
PATENTEDws' 81912 SHEET 2 BF 2 [.Illll ll.
WORK-TABLE ON MACHINES FOR PROCESSING METAL IN SHEET OR PLATE FORM The invention relates to a work-table on machines for processing metal in sheet or plate form, more particularly press brakes. A frequent occurrence in highpressure press brakes is that while a workpiece is being dealt with, the push-rod .bends up and the work-table bends down, with the result that there remains between the top tool and the bottom tool a gap which is larger towards the center than at both ends; machining accuracy is therefore impaired.
Suggestions have been made to compensate for such inaccuracies. For instance, a centring plate is known having a curvature strip which is transversely adjustable on a keyway and which is retained at both ends on the bottom part of the centring plate. This system provides fairly accurate compensation for bending, but with the great disadvantage that readjustment is required upon any change of material or tools or pressure.
It is an object of this invention to provide a worktable for machines for processing metal in sheet or plate form, more particularly press brakes, which compensates automatically for bending of this kind or ensures that no such bending can occur.
According to the present invention there is provided a work-table for a machine for processing metal of the class including sheet and plate, more particularly press brakes, and including a table panel, a support element which corresponds to the length of the table panel mounted in a bottom part and vertically displaceable therein and defining therewith a chamber for receiving oil on which the element will rest.
In order that the invention may be well understood there will now be described an embodiment thereof, given by way of example only, reference being had to the accompanying drawings in which:
FIG. 1 is a diagrammatic view in cross section of an embodiment of the work-table according to the invention, and
FIG. 2 is a diagrammatic view of a conventional press brake and associated pressure diagram.
FIG. 2 includes a diagrammatic front view of a press brake comprising a ram 1 and a work-table 2. A first tool 3 is disposed on ram 1 and a second tool 4 cooperating with tool 3 rests on table 2. Under load, particularly if the load is not evenly distributed, bending may occur in the form indicated by broken lines. This condition is shown in heavy lines in the pressure diagram in FIG. 2, P denoting the pressure and X denoting the place on the work-table.
FIG. 1 is a diagrammatic view in section of the new work-table according to the invention, comprising a panel 5 bearing a machining tool 6. Panel 5 rests on a support element 7 extending over the whole length of panel 5 and in cross section resembling an inverted T; element 7 is mounted for vertical displacement in a bottom member 8. The interior thereof in shape corresponds to the element 7, but when the same is in its top end position a space 9 remains free at the bottom of member 8. Space 9 is filled with oil at high pressure; sealing elements 10 on the support element 7 prevent the oil from escaping.
When a downwards pressure is applied to panel 5, 5:2 iifififitfhll? insis ent cltifi ifii the pressure e.g. at the center of panel 5 is greater than at the ends thereof, the back-pressure at the center of the panel is correspondingly greater than at the ends thanks to the compensating action of the oil cushion in chamber 9. The pressure distribution is therefore as indicated by thin lines in the diagram i.e., pressure distribution is completely uniform. Consequently, bending cannot occur and so a workpiece can be processed very accurately.
Iclaim:
l. A work-table for a machine for processing metal, said work-table being subjected to high pressure and including a table panel, and a support element having an inverted T-shape mounted in a bottom part with the head of the T cooperating with abutments on the bottom part to limit upward movement of the support element, said support element also having lateral sealing elements for making sealing engagement with the bottom part and vertically displaceable therein and defining therewith a chamber for receiving oil on which the element will rest.

Claims (1)

1. A work-table for a machine for processing metal, said worktable being subjected to high pressure and including a table panel, and a support element having an inverted T-shape mounted in a bottom part with the head of the T cooperating with abutments on the bottom part to limit upward movement of the support element, said support element also having lateral sealing elements for making sealing engagement with the bottom part and vertically displaceable therein and defining therewith a chamber for receiving oil on which the element will rest.
US9272A 1969-02-18 1970-02-06 Work-table on machines for processing metal in sheet or plate form Expired - Lifetime US3682465A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT160669A AT283851B (en) 1969-02-18 1969-02-18 Work table on sheet metal working machines

Publications (1)

Publication Number Publication Date
US3682465A true US3682465A (en) 1972-08-08

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US9272A Expired - Lifetime US3682465A (en) 1969-02-18 1970-02-06 Work-table on machines for processing metal in sheet or plate form

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US (1) US3682465A (en)
AT (1) AT283851B (en)
CH (1) CH495793A (en)
DE (1) DE2002665A1 (en)
FR (1) FR2032643A5 (en)
GB (1) GB1261175A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS512074A (en) * 1974-05-27 1976-01-09 Haemmerle Ag Maschf
US5067340A (en) * 1988-05-05 1991-11-26 Macgregor Donald C Precision press brake
US5813273A (en) * 1996-11-12 1998-09-29 Maru Kikai Kogya Co., Ltd. Press brake
US20040099038A1 (en) * 2002-10-17 2004-05-27 Alberto Arduino Bending press with a substantially undeformable toolholder beam
WO2013116888A1 (en) * 2012-02-10 2013-08-15 Trumpf Maschinen Austria Gmbh & Co. Kg. Press table or press beam having adjustable beam element
US10438919B1 (en) 2016-06-28 2019-10-08 Northrop Grumman Systems Corporation Passive hydraulic load leveler for thermal compression bonding

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT397942B (en) * 1990-11-21 1994-08-25 Reisner & Wolff Eng Device for compensating for the bending of press frames

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2389818A (en) * 1943-07-17 1945-11-27 Bliss E W Co Press
US2918272A (en) * 1959-02-16 1959-12-22 Floyd M Williamson Hydraulic system for controlling the return movement of pressure pads in air cushionpresses
US3303774A (en) * 1964-05-20 1967-02-14 Shiokawa Seiji Open-sided press

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2389818A (en) * 1943-07-17 1945-11-27 Bliss E W Co Press
US2918272A (en) * 1959-02-16 1959-12-22 Floyd M Williamson Hydraulic system for controlling the return movement of pressure pads in air cushionpresses
US3303774A (en) * 1964-05-20 1967-02-14 Shiokawa Seiji Open-sided press

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS512074A (en) * 1974-05-27 1976-01-09 Haemmerle Ag Maschf
JPS592569B2 (en) * 1974-05-27 1984-01-19 ヘンメルレ アクチエンゲゼルシヤフト マシネンフアブリク flat plate bending press
US5067340A (en) * 1988-05-05 1991-11-26 Macgregor Donald C Precision press brake
US5813273A (en) * 1996-11-12 1998-09-29 Maru Kikai Kogya Co., Ltd. Press brake
US20040099038A1 (en) * 2002-10-17 2004-05-27 Alberto Arduino Bending press with a substantially undeformable toolholder beam
US7013698B2 (en) * 2002-10-17 2006-03-21 Alberto Arduino Bending press with a substantially undeformable toolholder beam
WO2013116888A1 (en) * 2012-02-10 2013-08-15 Trumpf Maschinen Austria Gmbh & Co. Kg. Press table or press beam having adjustable beam element
US9381558B2 (en) 2012-02-10 2016-07-05 Trumpf Maschinen Austria Gmbh & Co. Kg. Press table or press beam having adjustable beam element
US10438919B1 (en) 2016-06-28 2019-10-08 Northrop Grumman Systems Corporation Passive hydraulic load leveler for thermal compression bonding

Also Published As

Publication number Publication date
AT283851B (en) 1970-08-25
CH495793A (en) 1970-09-15
GB1261175A (en) 1972-01-26
DE2002665A1 (en) 1970-09-03
FR2032643A5 (en) 1970-11-27

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