WO1979000805A1 - Procede et dispositif pour regler la profondeur de penetration du poincon d'une presse a plier - Google Patents

Procede et dispositif pour regler la profondeur de penetration du poincon d'une presse a plier Download PDF

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Publication number
WO1979000805A1
WO1979000805A1 PCT/CH1979/000044 CH7900044W WO7900805A1 WO 1979000805 A1 WO1979000805 A1 WO 1979000805A1 CH 7900044 W CH7900044 W CH 7900044W WO 7900805 A1 WO7900805 A1 WO 7900805A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
cylinders
double
acting
chambers
Prior art date
Application number
PCT/CH1979/000044
Other languages
German (de)
English (en)
Inventor
A Huber
Original Assignee
Beyeler Machines Sa
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 Beyeler Machines Sa filed Critical Beyeler Machines Sa
Publication of WO1979000805A1 publication Critical patent/WO1979000805A1/fr

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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
    • B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
    • 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
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/32—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure
    • B30B1/34—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure involving a plurality of plungers acting on the platen

Definitions

  • the present invention relates to a method for adjusting the penetration depth of the punch of a hydraulic press brake with means for stroke limitation and at least one counter-rotating cylinder pair with a single action. It also relates to a circulation device for the hydraulic flow for carrying out the method.
  • CH-PS 411 755 by Willy BEYELER describes a hydraulic press in which the deflection of the press beam and, at the same time, the tool wear are compensated for by the fact that the press beam rests rigidly on the side on each of a depth impact while its center is pressed against the table by pressure cylinders. As a result, these angular errors can be repaired in one and the same operation without lifting the press beam. -The angle of the edge remains the same over the entire length of the workpiece.
  • the processed material reacts to the pressure of the stamp to a certain extent elastically, so ⁇ ass sic
  • the edge angle opens a little again when the pressure is released; This reaction can also be observed during the work cycle, but can hardly be calculated in advance.
  • the desired angle can therefore usually not be obtained at the first attempt.
  • the depth of penetration of the star apex for a desired edge angle is fine-tuned by adjusting the depth stops, which serve as a rigid support for the press beam. It is indispensable for individual pieces and for the first workpiece in a series and has considerable effects in the production of individual pieces or small series. Wasted time.
  • the mechanical depth stops used in the preferred embodiment can only be adjusted when the press beam has been returned to the raised position; this means that there is no longer any pressure on the inner edge of the sheet to be machined, ie after the depth stops have been reset, the angle is repaired in a further operation, which can be assumed to at least get closer to the desired accuracy -
  • the outer cylinders can still be adjusted while the press beam is working, as long as medium or small pressures are used; it is then sufficient to release the pressure in the chambers limiting the stroke, so that the displacement of the piston of the outer cylinders increases a little.
  • liquids used for the stroke limitation can be compressed to a certain degree and consequently allow mechanical depth stops compared to less precise adjustment of the penetration depth of the punch into the material to be processed; the adjustment of hydraulic depth stops by simply reducing the pressure causes additional inaccuracies under the pressure of the press beam, so that this procedure is unusable at high pressures.
  • the present invention aims to allow an adjustment of the depth stop in press brakes with stroke limitation of the outer cylinders during the work of the press beam.
  • the method of adjustment is characterized in that the pressure in a chamber of at least 0 of such a cylinder or pair of cylinders is dropped, and then "in the opposite chamber of at least one such cylinder or pair of cylinders a counterpressure is built up, which forces at least partially counteracting it and that the stroke limitation is finally adjusted by means of known, suitable means despite the pressed beam being lowered, that is to say the workpiece is under pressure.
  • the method can be carried out both in the case of hydraulic press brakes with mechanical stroke limitation and in those with hydraulic stroke limitation.
  • the circulation device for carrying out the method is characterized in turn by the fact that pressure from chambers of double-acting cylinders can be reduced or eliminated in favor of a counterpressure in chambers of such cylinders arranged opposite one another.
  • Fig. 2 shows the same sheet during the correction: the
  • Stamp penetrates deeper into the die;
  • Fig. 3 shows in elevation a 4-cylinder, hydraulic
  • FIG. 5 shows schematically the cylinders of a 5-cylinder press brake during the deformation of the sheet
  • 3 and 4 show a preferred embodiment in which the press brake has two outer, single-acting cylinders 1 and two inner, middle, double-acting cylinders 2, the diameter of both the cylinder (D) and the piston ( d) is the same for all four cylinders.
  • the pressure P of the outer cylinders on the depth stops 3 is released, so that only the weight of the press beam is added 4 and, if necessary, the sheet 5 on the depth stops 3.
  • the counter pressure P 'in the middle cylinders 2 is increased compared to the pressure P of the outer cylinders 1 in order to reduce or completely eliminate the weight of the press beam 4 and, if appropriate, the sheet 5 on the depth stop 3, which the adjustment of the depth stop is additionally facilitated.
  • the method according to the invention can be used in all other hydraulic press brakes which have a mechanical depth stop and at least one double-acting cylinder.
  • the middle cylinder for lifting the pressure P will have to apply twice the force of one of the single-acting cylinders 1 to the depth stops. 3 relieve the pressure P, and a slightly higher force to relieve them of the weight of the press beam 4.
  • each of the middle cylinders 2 can be chosen correspondingly lower in order to compensate for the pressure of the single-acting cylinders; the distribution of the current flow to the chambers of the individual cylinders 2 is adjusted accordingly.
  • a back pressure P ′ that is the same as the pressure P ′ of the outer cylinders 1 is built up in two of the middle cylinders 2, while in the third double-acting cylinder only the pressure has dropped and no back pressure is built up there.
  • the invention is also applicable to press brakes in which the press beam 4 is pressed against a table from below. In this embodiment, it is not just the counter pressure of the table 7 and the workpiece 5 to be machined that affects the pressure P, in particular the outer cylinder 1 opposed, but also the weight of the machined workpiece 5, so that here one makes do with an adjustment of the depth stops with somewhat smaller counter pressures P 1 in the middle cylinders 2 than in the above-mentioned embodiments.
  • the present invention is used in particular in the press brakes described in the above-mentioned CH-PS 43.1 755, in which the deflections of the press beam 4 and the table 7 caused by the high pressures are caused by moving the middle cylinders 2 beyond the dead center of the outer ones Cylinder 1 can also be compensated. But it can also be used on • press brakes in which the stroke of the cylinders is probably limited by one or more depth stops without being equipped with the compensation system mentioned above.
  • the depth stops 3 are each located in the interior of a simple / external cylinder 1.
  • the invention is not limited to this. It is particularly applicable when double-acting cylinders are used as outer cylinders 1, the stroke of which is limited, for example, by a depth stop contained in their interior. It can also be used if the depth stops 3 are located outside the cylinders (e.g. arranged axially to the outer cylinders) and in this way are located at the side of the ram.
  • the circulation device for carrying out the method is fed by one and the same pump, the current flow available being divided between the various chambers during the working cycle and the "superfluous" liquid is drained from the chamber of the middle cylinder into a reservoir until the depth stops are reset.
  • the flow is diverted to the latter by means of known constant flow dividers (not shown) to build up the counterpressure P 'in the chambers of the two middle cylinders 2, while the pressure P in the chambers opposite them falls off.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Press Drives And Press Lines (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

Le procede et le dispositif servent a regler la profondeur de penetration d'une presse a plier hydraulique. Ils permettent un ajustage des butees de profondeur (3) du sommier de pression (4), sans qu'on ait besoin de lever le sommier de pression de la piece a travailler. Les butees de profondeur (3) sont soulagees temporairement par une pression dans les cylindres agissant en sens inverse du sommier de pression (4), par exemple dans des cylindres a double effet, (2) sans que la pression sur la piece a travailler ne soit diminuee. Cela permet un reglage precis de la profondeur de penetration en une seule operation. Le procede est applicable sur des presses a plier possedant un limiteur de course mecanique ou hydraulique.
PCT/CH1979/000044 1978-03-21 1979-03-20 Procede et dispositif pour regler la profondeur de penetration du poincon d'une presse a plier WO1979000805A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3056/78 1978-03-21
CH305678A CH629402A5 (de) 1978-03-21 1978-03-21 Verfahren zum verstellen der eindringtiefe des stempels einer hydraulischen abkantpresse und hydraulische einrichtung zur ausfuehrung des verfahrens.

Publications (1)

Publication Number Publication Date
WO1979000805A1 true WO1979000805A1 (fr) 1979-10-18

Family

ID=4247621

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1979/000044 WO1979000805A1 (fr) 1978-03-21 1979-03-20 Procede et dispositif pour regler la profondeur de penetration du poincon d'une presse a plier

Country Status (6)

Country Link
JP (1) JPS55500269A (fr)
CH (1) CH629402A5 (fr)
DE (1) DE2943224D2 (fr)
GB (2) GB2039237B (fr)
SE (1) SE7909577L (fr)
WO (1) WO1979000805A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4552002A (en) * 1982-06-07 1985-11-12 Hammerle, Ag Plate bending apparatus
US5329795A (en) * 1991-12-30 1994-07-19 Amada Company, Ltd. Precision bending press for relatively short pieces of sheet metal
CN112829359A (zh) * 2019-11-22 2021-05-25 赵俊儒 板材压力机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB667323A (en) * 1950-02-17 1952-02-27 John Pidcock Improvements relating to bending machines
FR1128138A (fr) * 1955-06-27 1957-01-02 Perfectionnements apportés aux vérins hydrauliques et leurs applications, plus spécialement aux presses-plieuses
FR1517000A (fr) * 1967-01-31 1968-02-05 Perfectionnements aux vérins hydrauliques en vue, notamment, de leur application àdes presses ou machines analogues

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB667323A (en) * 1950-02-17 1952-02-27 John Pidcock Improvements relating to bending machines
FR1128138A (fr) * 1955-06-27 1957-01-02 Perfectionnements apportés aux vérins hydrauliques et leurs applications, plus spécialement aux presses-plieuses
FR1517000A (fr) * 1967-01-31 1968-02-05 Perfectionnements aux vérins hydrauliques en vue, notamment, de leur application àdes presses ou machines analogues

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4552002A (en) * 1982-06-07 1985-11-12 Hammerle, Ag Plate bending apparatus
US5329795A (en) * 1991-12-30 1994-07-19 Amada Company, Ltd. Precision bending press for relatively short pieces of sheet metal
CN112829359A (zh) * 2019-11-22 2021-05-25 赵俊儒 板材压力机

Also Published As

Publication number Publication date
CH629402A5 (de) 1982-04-30
GB2039237A (en) 1980-08-06
GB2039237B (en) 1982-06-16
SE7909577L (sv) 1979-11-19
GB2035889A (en) 1980-06-25
JPS55500269A (fr) 1980-05-08
DE2943224D2 (en) 1980-11-13
GB2035889B (en) 1982-10-13

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