US3664174A - Sheet metal working machine - Google Patents

Sheet metal working machine Download PDF

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Publication number
US3664174A
US3664174A US34299A US3664174DA US3664174A US 3664174 A US3664174 A US 3664174A US 34299 A US34299 A US 34299A US 3664174D A US3664174D A US 3664174DA US 3664174 A US3664174 A US 3664174A
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US
United States
Prior art keywords
ram
piston
sheet metal
actuating
working machine
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
US34299A
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English (en)
Inventor
Eduard Hanni
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.)
HAMMERLA AG MASCHINENFABRIK
Original Assignee
HAMMERLA 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
Application filed by HAMMERLA AG MASCHINENFABRIK filed Critical HAMMERLA AG MASCHINENFABRIK
Application granted granted Critical
Publication of US3664174A publication Critical patent/US3664174A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam

Definitions

  • a sheet metal working machine with a worktable has a ram which is controlled by at least two actuating and guiding ele- US.
  • the present invention relates to a sheet metal working machine with a worktable and a ram, the latter being under the influence of at least two actuatingand guiding elements, each one equipped with a pressure cylinder actuated by a piston under pressure.
  • Sheet metal working machines are often equipped with a fixed guiding pillar arranged on both sides of the worktable, this pillar housing the movable ram and where the guiding pillars also accommodate the actuating elements.
  • the pillars therefore assume the function of a guiding as well as an actuating element. With an asymmetrical load on the ram, it can easily happen that it is no longer moving parallel to the worktable, but that the guiding pillars are deflected, whereby an accurate machining of the workpiece is rendered impossible, bringing about the damaging of the machine.
  • the actuating element at the other side of the workpiece meets less resistance and covers a greater distance than the actuating element adjacent to the workpiece.
  • the guiding pillar next to the workpiece is particularly subject to bending stresses and this may even lead to seizing of the ram. If, then, the guiding element with a smaller load would be actuated to a smaller extent, i.e. in the case of a hydraulic piston under lower pressure, this bending efiect could be avoided. As an additional feature, it should be pointed out that this greatly depends on the exact positioning of the workpiece and its shape.
  • the invention therefore aims at designing a sheet metal working machine of the above described type which automatically compensates any deformation of the guiding elements over and above a certain range of tolerance. According to the invention, this is achieved by a piston in each one of the actuating and guiding elements having at least two separate working surfaces of different size and in separate spaces and that each actuating and guiding element is provided with a control organ, whose action is a function of the eccentricity of the load on the ram and controlling the pressure applied on the individual pistons.
  • the enclosed drawing shows the sheet metal working machine as per invention in a front view, in which the left-hand actuating and guiding element is cut open.
  • the sheet metal working machine has a worktable l rigidly connected to the right and to the left with one actuating and guiding element 2a and 212 each. Furthermore, a ram 3 is provided, which is located on the two guiding and actuating elements in a movable manner in longitudinal direction. At the lower end of the ram 3, a bending tool 4 may be affixed, for instance, operating in concert with the bending tool 5 mounted on the worktable.
  • a fixed guiding sleeve 6 On both sides of the worktable l, a fixed guiding sleeve 6 is mounted, whereas ram 3 is supported by one movable guiding sleeve 7 each.
  • the guiding sleeves 6 and 7 are mounted co-axially on the guiding sleeve 8, and where the guiding sleeve 7 is held by means of non-illustrated bushes in an axially displaceable manner.
  • the inside of the guiding pillar 8 houses a piston 9 which rests against a dog 10. This dog 10 extends across axial slots in the guiding pillar 8, which are not illustrated and is lodged in corresponding cut-outs in the movable guiding sleeve 7.
  • the piston 9 has an axial bore 11 which is closed at one end, in which an axial extension 13 is located, forming a fixed part of cover 12 closing the guiding pillar 8.
  • This cover is provided with a centrally located bore 14 passing through and extending through the whole extension, as well as an eccentric through bore 15 located beside the extension.
  • a first working surface 16 of smaller dimensions is formed inside bore 1 1 on the surface of piston 9, as well as a second, circular surface 17 of larger dimensions, separated from each other by a pressure seal 18.
  • the center bore 14 is the inlet for the pressure fluid to the first working surface 16, whereas through the eccentric bore 15, pressure fluid 17 is admitted to the second working surface.
  • a bar 19 extending in a downward direction is rigidly fixed, having at its lower end a number of switches 20a and 20b
  • switches 20a and 20b In the example illustrated, three switches 20a are fixed to the lefi-hand side and three switches 20b are fixed to the right-hand side of the bar. These switches are in connection with an electro-hydraulic control loop which is not illustrated, the latter regulating the feed of the pressure fluid to the actuating elements.
  • the machine is operating as follows:
  • a workpiece is symmetrically arranged underneath the ram. Both pistons receive pressure fluid through bores 14 and 15, the ram is lowered in a perfectly parallel manner until it touches the workpiece.
  • the two actuating elements are meeting the same resistance, they move to the same extent in a downward direction and the bar 19 remains perfectly vertical without triggering one of the switches 20a or 20b Second case.
  • the feed control of the pressure fluid for the various working surfaces of piston 9 may also be realized in a different manner:
  • a sheet metal working machine with a worktable and a ram in which the ram is under the influence of at least two actuating and guiding elements, each one fitted with a cylinder and a pressure operated piston, wherein the piston (9) in each of the actuating and guiding elements features two separated working surfaces of different size (l6, l7) and that to each actuating and guiding element, a control organ is allocated, acting to regulate the pressure on the individual piston surfaces in accordance with the eccentricity of the load on ram 3.
  • a sheet metal working machine wherein the ram is provided with a firmly fixed bar (19) extending in a downward direction, and where, within the range of the lower end of said bar (19) a number of switches (20a, 20b are actuated whenever the ram takes up an oblique position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
US34299A 1969-05-28 1970-05-04 Sheet metal working machine Expired - Lifetime US3664174A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT507869A AT290252B (de) 1969-05-28 1969-05-28 Blechbearbeitungsmaschine

Publications (1)

Publication Number Publication Date
US3664174A true US3664174A (en) 1972-05-23

Family

ID=3571670

Family Applications (1)

Application Number Title Priority Date Filing Date
US34299A Expired - Lifetime US3664174A (en) 1969-05-28 1970-05-04 Sheet metal working machine

Country Status (5)

Country Link
US (1) US3664174A (de)
AT (1) AT290252B (de)
CH (1) CH512319A (de)
DE (1) DE2022607A1 (de)
FR (1) FR2048540A5 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768400A (en) * 1971-01-22 1973-10-30 Haemmerle Ag Maschf Press having means to prevent skewing movement of the ram
JPS4980986U (de) * 1972-10-31 1974-07-12
US4057009A (en) * 1975-08-19 1977-11-08 Burford Corporation Downstroke baler
DE3016527A1 (de) * 1980-04-29 1981-11-05 Deutsche Vereinigte Schuhmaschinen Gmbh, 6000 Frankfurt Schwenkarmstanze

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE411181B (sv) * 1978-05-02 1979-12-10 Electrolux Ab Balpress eller liknande press

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2309944A (en) * 1941-06-21 1943-02-02 Hydraulic Dev Corp Inc Platen leveling device
US2343167A (en) * 1941-06-21 1944-02-29 Hydraulic Dev Corp Inc Press leveling means
US2377007A (en) * 1941-09-29 1945-05-29 American Steel Foundries Equalizing hydraulic ram travel
GB717505A (en) * 1951-08-08 1954-10-27 Siempelkamp Eugen Improvements in or relating to hydraulic presses

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2309944A (en) * 1941-06-21 1943-02-02 Hydraulic Dev Corp Inc Platen leveling device
US2343167A (en) * 1941-06-21 1944-02-29 Hydraulic Dev Corp Inc Press leveling means
US2377007A (en) * 1941-09-29 1945-05-29 American Steel Foundries Equalizing hydraulic ram travel
GB717505A (en) * 1951-08-08 1954-10-27 Siempelkamp Eugen Improvements in or relating to hydraulic presses

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768400A (en) * 1971-01-22 1973-10-30 Haemmerle Ag Maschf Press having means to prevent skewing movement of the ram
JPS4980986U (de) * 1972-10-31 1974-07-12
US4057009A (en) * 1975-08-19 1977-11-08 Burford Corporation Downstroke baler
DE3016527A1 (de) * 1980-04-29 1981-11-05 Deutsche Vereinigte Schuhmaschinen Gmbh, 6000 Frankfurt Schwenkarmstanze

Also Published As

Publication number Publication date
FR2048540A5 (de) 1971-03-19
CH512319A (de) 1971-09-15
AT290252B (de) 1971-05-25
DE2022607A1 (de) 1970-12-23

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