US3829074A - Work-table on machines for processing metal - Google Patents

Work-table on machines for processing metal Download PDF

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Publication number
US3829074A
US3829074A US00316016A US31601672A US3829074A US 3829074 A US3829074 A US 3829074A US 00316016 A US00316016 A US 00316016A US 31601672 A US31601672 A US 31601672A US 3829074 A US3829074 A US 3829074A
Authority
US
United States
Prior art keywords
support element
oil
table base
panel
chamber
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.)
Expired - Lifetime
Application number
US00316016A
Other languages
English (en)
Inventor
E Hanni
W Gygli
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.)
Haemmerle AG Maschinenfabrik
Original Assignee
Haemmerle AG Maschinenfabrik
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
Priority claimed from AT1102671A external-priority patent/AT312393B/de
Application filed by Haemmerle AG Maschinenfabrik filed Critical Haemmerle AG Maschinenfabrik
Application granted granted Critical
Publication of US3829074A publication Critical patent/US3829074A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/02—Die-cushions
    • 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
    • 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

Definitions

  • the present invention relates to a work-table on machines for processing metal in sheet or plate form, more particularly press brakes.
  • a frequent occurrence in high-pressure press brakes is that while a work-piece is being dealt with, the push-rod bends up and the worktable bends down, with the result that there remains between the top tool and the bottom tool a gap which is larger towards the centre 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 re-adjustment is required upon any change of material or tools or pressure.
  • US. Pat. No. 3,682,465 relates to a work-table on machines for processing metal in sheet or plate form, more particularly press brakes.
  • this Patent provides the work-table with a work-table panel, and a support element having an inverted T-shape mounted in a part with the head of the T cooperating with abutments on the bottom part to limit upward movement of the supportelement, 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 support element will rest.
  • Such a work-table has proved very reliable and it has been shown that very precise work can be performed with a machine equipped with such a work-table.
  • the support element and the member for guiding the support element has to be machined with a very high degree of accuracy in order to avoid any oil leaks.
  • a work-table for a very long press brake or a work-table subjected to very high pressure has been shown as very expensive in construction.
  • this is achieved on a work-table as described above by providing at least one vertically displaceable separation member between the support element and the oil.
  • FIG. 1 is a diagrammatic view in cross-section of a first embodiment of the work-table according to the invention.
  • FIG. 2 is a similar view of a second embodiment.
  • FIG. 1 is a diagrammatic view in cross-section of a first embodiment, comprising a table panel 1 for supporting a tool 2.
  • Panel 1 rests on a support element 3 which extends over the whole length of panel 1 and in cross-section resembles an inverted T; element 3 is mounted for vertical displacement in a member 4.
  • the interior of the members 4 in cross-section resembles an inverted T corresponding to that of the element 3, but the depth of the cross piece of the T of the interior of member 4 is greater than that of the element 3 to define between element 3 and member 4 a chamber.
  • a plate 5 is mounted in this room, extending substantially parallel to the lower surface of element 3 and dividing the room below element 3 into two parts.
  • the plate 5 is provided with a number of circular bores 6 in which a corresponding number of pistons 7 are inserted.
  • Each of the pistons 7 is equipped with two sealing rings 8 in order to seal the two parts of the room below element 3 from each other.
  • the pistons 7 are displaceable in the bores 6 in vertical direction.
  • the lower part of the room below element 3 is filled with oil 9 under high pressure and the piston 7 rest against the surface of this oil bed with their lower frontal face.
  • the element 3 rests against the upper frontal faces of pistons 7, which extend in the upper part of the room below element 3.
  • FIG. 2 A second embodiment is shown in FIG. 2, comprising a table panel I for supporting a tool 2.
  • Panel 1 rests on a support element 3 which extends over the whole length of panel 1 and in cross-section resembles an inverted T; element 3 is mounted for vertical displacement in a guiding member 10 arranged within a basic member 4.
  • the interior of the member 10 in crosssection resembles an inverted T corresponding to that of the element 3.
  • the lower, inner surface of the basic element 4 is provided with a recess extending nearly over the whole length of it, which is filled with oil 9.
  • the surface of this oil bed 9 is covered by a elastic diaphragm 11, the size of which is somewhat larger than the area of the surface of the oil bed 9.
  • the lower face of the guiding member 10 contacts a part of the surface of the diaphragm I1 and holds it firmly in place, making thereby a scaling engagement between abutments on member 4, diaphragm II and lower face of guiding element 10.
  • a work-table comprising a table panel, a table base, an inverted T-shaped support element, said table base and said support element extending over the entire length of said panel, said support element supporting this load bearing dimension of the panel;
  • said T-shaped support element itself defining over the same length dimension with said table base an oil chamber;
  • abutment means on said table base for mounting said T-shaped support element so that said T-shaped support element is vertically displaceable and is mounted in said table base with the head of the T cooperating with said abutments on said table base to limit upward movement of said support element;
  • sealing rings for sealing said pistons of the inner surface of the openings in said plates, said sealing rings preventing the flow of oil above the lower surface of said pistons and separating the free space above the plate from the oil filled space below the plate.
  • a work-table comprising a table panel, a table base and an inverted T-shaped support element said table base and said support element extending over the entire length of said panel and said support element supporting this load bearing dimension of the panel;
  • said T-shaped support element itself defining over the same length dimension with said table base and an oil chamber;
  • abutment means on said table base for mounting said T-shaped support element so that said Tshaped support element is vertically displaceable and is mounted in said table base with the head of the T cooperating with said abutments on said table base to limit upward movement of said support element;
  • sealing means for fixing said diaphragm in said table base, said sealing means sealing said oil filled chamber to prevent oil therein from moving above said diaphragm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Units (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US00316016A 1971-12-22 1972-12-18 Work-table on machines for processing metal Expired - Lifetime US3829074A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT1102671A AT312393B (de) 1971-12-22 1971-12-22 Arbeitstisch an Blechbearbeitungsmaschinen

Publications (1)

Publication Number Publication Date
US3829074A true US3829074A (en) 1974-08-13

Family

ID=3626299

Family Applications (1)

Application Number Title Priority Date Filing Date
US00316016A Expired - Lifetime US3829074A (en) 1971-12-22 1972-12-18 Work-table on machines for processing metal

Country Status (5)

Country Link
US (1) US3829074A (enrdf_load_stackoverflow)
CA (1) CA972272A (enrdf_load_stackoverflow)
FR (1) FR2173911A2 (enrdf_load_stackoverflow)
GB (1) GB1363789A (enrdf_load_stackoverflow)
IT (1) IT1045609B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4016742A (en) * 1970-12-25 1977-04-12 Seiji Shiokawa Press-forming apparatus
US5067340A (en) * 1988-05-05 1991-11-26 Macgregor Donald C Precision press brake
WO2013116888A1 (de) * 2012-02-10 2013-08-15 Trumpf Maschinen Austria Gmbh & Co. Kg. Presstisch oder pressbalken mit verstellbarem balkenelement
EP4159339A1 (de) * 2021-10-01 2023-04-05 Schuler Pressen GmbH Pressenelement einer presse, pressentisch sowie presse

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2842357A (en) * 1957-03-04 1958-07-08 Floyd M Williamson Circulating systems for hydraulic liquid between storage tanks and cylinders
US3677041A (en) * 1969-08-20 1972-07-18 Turner Ag Maschf Apparatus for working flat, flexible material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2842357A (en) * 1957-03-04 1958-07-08 Floyd M Williamson Circulating systems for hydraulic liquid between storage tanks and cylinders
US3677041A (en) * 1969-08-20 1972-07-18 Turner Ag Maschf Apparatus for working flat, flexible material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4016742A (en) * 1970-12-25 1977-04-12 Seiji Shiokawa Press-forming apparatus
US5067340A (en) * 1988-05-05 1991-11-26 Macgregor Donald C Precision press brake
WO2013116888A1 (de) * 2012-02-10 2013-08-15 Trumpf Maschinen Austria Gmbh & Co. Kg. Presstisch oder pressbalken mit verstellbarem balkenelement
US9381558B2 (en) 2012-02-10 2016-07-05 Trumpf Maschinen Austria Gmbh & Co. Kg. Press table or press beam having adjustable beam element
EP4159339A1 (de) * 2021-10-01 2023-04-05 Schuler Pressen GmbH Pressenelement einer presse, pressentisch sowie presse

Also Published As

Publication number Publication date
FR2173911A2 (enrdf_load_stackoverflow) 1973-10-12
IT1045609B (it) 1980-06-10
CA972272A (en) 1975-08-05
GB1363789A (en) 1974-08-14

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