EP0607498A1 - Méthode de commande d'une presse à couper et une presse à couper - Google Patents

Méthode de commande d'une presse à couper et une presse à couper Download PDF

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Publication number
EP0607498A1
EP0607498A1 EP93114296A EP93114296A EP0607498A1 EP 0607498 A1 EP0607498 A1 EP 0607498A1 EP 93114296 A EP93114296 A EP 93114296A EP 93114296 A EP93114296 A EP 93114296A EP 0607498 A1 EP0607498 A1 EP 0607498A1
Authority
EP
European Patent Office
Prior art keywords
tool
cutting press
punch
beam path
punching
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.)
Granted
Application number
EP93114296A
Other languages
German (de)
English (en)
Other versions
EP0607498B1 (fr
Inventor
Heiko Dipl.-Ing. Freter
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.)
C Behrens AG
Original Assignee
C Behrens AG
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 C Behrens AG filed Critical C Behrens AG
Publication of EP0607498A1 publication Critical patent/EP0607498A1/fr
Application granted granted Critical
Publication of EP0607498B1 publication Critical patent/EP0607498B1/fr
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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/12—Punching using rotatable carriers
    • 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
    • B21D55/00—Safety devices protecting the machine or the operator, specially adapted for apparatus or machines dealt with in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0029—Details of, or accessories for, presses; Auxiliary measures in connection with pressing means for adjusting the space between the press slide and the press table, i.e. the shut height
    • B30B15/0041—Control arrangements therefor

Definitions

  • the invention relates to a cutting press according to the preamble of claim 1.
  • the invention further relates to a method for operating such a cutting press according to the preamble of claim 6.
  • the top dead center must be set just above the highest point of the respective workpiece and can therefore also be seen in a workpiece-specific manner.
  • the punching tool is usually held in a tool holder and has a tool length corresponding to its regrinding degree, which is used when setting the top dead center must be taken into account.
  • it is known to measure the length of the individual workpiece manually before inserting it into the tool holder and to enter the determined measured value into the corresponding data memory of a control system controlling the stroke of the punch drive.
  • the stroke set correctly in this sense is characterized in that the cutting edge of the punching tool is located slightly above the workpiece in the top dead center and in the bottom dead center approximately at the bottom edge of the cutting cylinder of the die of the bottom tool.
  • a disadvantage of this known type of machine setting is that there are numerous possible errors, for example an incorrect tool length measurement and / or an incorrect input of the measured tool length into the data memory, possibly in conjunction with an also incorrect assignment of a measured value to the tool holder of the individual tool . If the correct tool length values are not available for the control, there are no optimal values for the stroke and this leads to unprofitable operation of the press or to machine and / or tool damage.
  • the arrangement of a beam path that intersects the travel path of the punching tool and runs between a transmitter and a receiver, which are arranged to be movable relative to the workpiece to be machined, so that a top dead center is reached via the intersection of this beam path with the travel path of the punching tool of the punch stroke at least immediately adjacent point is definable, which can be placed in the immediate vicinity of the workpiece surface by appropriate movement of the pair of elements consisting of transmitter and receiver.
  • the workpieces to be punched generally have a sheet-like shape and are only provided with certain elevations, beads or the like, which must be taken into account when determining the top dead center, in order to position them correctly, ie unimpeded by the punching tool, relative to the respective machining position to enable. This positioning can be done in a manner known per se by means of a coordinate table.
  • the top dead center can be automatically determined with the path information supplied via the path encoder, and without the prior determination of the respective tool length being required. From the rest Machine data, the bottom dead center of the lifting movement can be easily determined, so that the cutting press equipped according to the invention has the advantage that a reground punching tool only has to be inserted into a tool holder, without extensive, time-consuming and costly adjustment processes being required before starting operation.
  • any radiation sources can be used which enable the construction of a radiation chain consisting of transmitter, beam path and receiver.
  • any measuring system can be used as the displacement sensor, which on the output side supplies a preferably electrical measuring signal in analog or digitally coded form with sufficient measuring accuracy.
  • the radiation chain consisting of the transmitter and the receiver must also be movably arranged on the machine frame of the cutting press, specifically in the direction of the workpiece, which is generally synonymous with a movability in the direction of the movability of the punching tool. The specific design of the drive required for this can also be carried out as long as there is sufficient setting accuracy.
  • the principle according to the invention can be used for basically all types of cutting presses, e.g. Cutting presses with a single head station, but also turret cutting presses.
  • Both the punch drive and the drives of the transmitter and the receiver are preferably designed according to the features of claims 3 and 4 as pressurizable piston-cylinder units. In conjunction with proportional valves, this enables precise setting of intermediate positions within the maximum possible stroke movements.
  • the features of claim 5 represent the most common application of the invention. It is a turret blending press, the said beam path being perpendicular to the travel path of the punching tool and the radiation chain being arranged in the vicinity of the work station, so that the beam path is between the turret adjusters and extends above the workpiece. In the latter case, it is assumed that the turret plates are vertically one above the other.
  • the invention is of course equally applicable to turret adjusters rotatably arranged about a horizontal axis.
  • this object is achieved by the features of the characterizing part of claim 6.
  • the features of claim 7 show that the invention at the same time enables permanent or activatable at arbitrary times control of the operation of the cutting press for possible tool breaks.
  • a tool breakage is then determined only by comparing the value of a path element with a predeterminable value, the first path element corresponding to the distance between the top dead center and the intersection of the beam path with the travel path of the punching tool. If this path element changes in the sense of an extension, this is to be seen as an indication of a tool break, which can be displayed in a suitable manner via the control system, so that the worn tool can be replaced at an early stage and replaced by a perfect tool . In this way, sources of error such as a tool break are recognized immediately after their first occurrence, so that countermeasures can be initiated more quickly.
  • Each turret plate carries, in a manner known per se, a multiplicity of tool sets in the circumferential area, the upper tool 4 held by an individual in the upper turret plate 2 Tool set usually consists of a punch holder, a punch and a scraper and wherein the lower tool 5 held in the lower turret plate consists of at least one die shoe and die.
  • the upper 4 and the lower tool 5 are fastened to the respective turret plate 1, 2 in a suitable manner, not shown in the drawing.
  • the upper tool 4 can be coupled to a punch drive 6 in a rotary angle station which forms the work station.
  • the punch drive is designed as a piston-cylinder unit, via the piston rod 7 of which the force required for the punching process is transmitted.
  • the punching tool 8 is coupled to the punch drive 6 in the drawing, which interacts with the associated die 9 of the respective lower tool when the punching process is carried out.
  • the position of the punch drive 6 defines the work station of the cutting press and the axis 8 'of the tool set located in the work station extends parallel to the axis 1 of the turret plates 3, 4.
  • the workpiece 10 to be punched here a sheet-like sheet, has been moved into a predetermined position relative to the work station, for example by means of a coordinate table (not shown in the drawing), and is held in this position in a suitable manner.
  • the punching tool 8 is directed towards the workpiece 10 in the direction of the axis 8 ′, through it and then returned to its starting position.
  • the stroke of the punch 8 is set such that at top dead center the lower edge or cutting edge of the punch 8 is slightly above the top of the workpiece 10 and that at the bottom dead center this cutting edge is in the area of the lower edge of the die profile of the lower tool.
  • the displacement sensor 11 carries a preferably electrical measurement signal on the output side.
  • the pressurization of the punch drive 6 is dimensioned such that within its maximum stroke it is possible to set any paths and in particular any intermediate strokes. This can be achieved with proportional directional control valves, for example.
  • the punch drive 6, in conjunction with the control mentioned, thus enables a stroke setting that is precisely adapted to the individual case.
  • a transmitter is located at the side with respect to the turret plate, in particular at the work station, and cooperates with a receiver 13 located opposite it and also at the side of the work station.
  • the transmitter 12 forms with the receiver 13 a beam path 14 that intersects the travel path of the punching tool 8 in the work station.
  • piston-cylinder units 15, 16 designate piston-cylinder units which can be pressurized, the cylinders of which are fastened in a suitable manner to the machine frame of the turret cutting press and the pistons of which are firmly connected to guide parts 17, 18, to which the transmitter 12 and the receiver 13 are respectively attached are.
  • the piston-cylinder units 15, 16 extend parallel to the axis 1 of the turret cutting press. Essential is that the piston-cylinder units 15, 16 can be controlled in such a way that any positions of the transmitter 12 and the receiver 13 can be adjusted along the displacement path or that a fixed bottom dead center is approached, the position of which is known to the control.
  • the piston-cylinder units 15, 16 are connected to the control, via which the extended positions of the guide parts 17, 18 can be controlled, for example, with the interposition of proportional valves.
  • the extended positions of the transmitter 12 and the receiver 13 are always designed such that the beam path 14 extends parallel to the levels of the turret plates 2, 3 and is located slightly above the high positions 19.
  • the beam path 14 is used to define the top dead center of the punch stroke, which will be discussed in more detail below.
  • the transmitter 12 and the receiver 13 are first moved into their workpiece-specific position, shown in the drawing, by appropriately loading the piston-cylinder units 15, 16.
  • This position is characterized in that the beam path runs at the smallest possible distance above the highest shape or high positions 19 of the workpiece 10. If the piston-cylinder units 15, 16 are always controlled in such a way that they approach their fixed bottom dead center, this is placed in such a way that it is slightly above the greatest possible high positions 19. Act at these high positions it is grooves or other structural elements protruding from the plane of the workpiece 10 on the upper side.
  • the punching tool 8 located in the work station is now moved in its axial direction in the direction of the workpiece 10 by appropriate loading of the piston-cylinder unit 6, the travel path being detected by the displacement sensor 11 and being continuously transmitted to the control.
  • a signal indicating this state of the control is transmitted via the receiver 13, the control determining the top dead center of the punching stroke from this signal in conjunction with the travel information acquired via the travel sensor 11. From the position of this top dead center in connection with the known position of the bottom tool, the control can be used to calculate the optimum punch stroke, in particular the position of the top and bottom dead center, and the turret cutting press is subsequently operated with the punch stroke assigned to this specific punch tool.
  • This top dead center is characterized in that the tool cutting edge is located slightly above the light beam 14, so that a defined path element has to be traversed starting from this top dead center until the beam path 14 is interrupted.
  • This path element which is available to the control as a calculation variable by evaluating the signals from the path transmitter 11 and the receiver 13, remains unchanged as long as there are no changes in the area of the cutting edge of the punching tool 8. However, if there are breaks in the area of this cutting edge during the operation of the respective punching tool, this "tool change" is immediately recognizable as such on the basis of the associated extension of the path element mentioned, this recognition process via the control in FIG can be appropriately made visible or perceptible.
  • Such a tool breakage check can be initiated by the user of the cutting press regularly or automatically or at predefinable times.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
EP93114296A 1993-01-20 1993-09-07 Méthode de commande d'une presse à couper et une presse à couper Expired - Lifetime EP0607498B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4301309A DE4301309C2 (de) 1993-01-20 1993-01-20 Schneidpresse
DE4301309 1993-01-20

Publications (2)

Publication Number Publication Date
EP0607498A1 true EP0607498A1 (fr) 1994-07-27
EP0607498B1 EP0607498B1 (fr) 1996-07-10

Family

ID=6478497

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93114296A Expired - Lifetime EP0607498B1 (fr) 1993-01-20 1993-09-07 Méthode de commande d'une presse à couper et une presse à couper

Country Status (2)

Country Link
EP (1) EP0607498B1 (fr)
DE (2) DE4301309C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1782943A3 (fr) * 2005-11-02 2009-06-03 Fette GmbH Procédé et système de mesure pour produire une référence dans une presse à poudre
CN110202062A (zh) * 2019-04-23 2019-09-06 滁州达世汽车配件有限公司 一种汽车后部防护板冲压模具的纠正装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006041282A1 (de) * 2006-09-02 2008-03-27 Frimo Group Gmbh Perforationsvorrichtung
CN103625674A (zh) * 2013-11-29 2014-03-12 淄博新力塑编有限公司 打包尺寸限位装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2141521A1 (de) * 1971-08-19 1973-03-22 Trumpf & Co Einstelleinrichtung fuer die hublage eines hin- und herbewegbaren werkzeuges
JPH02151400A (ja) * 1988-12-01 1990-06-11 Aida Eng Ltd プレスのスライド位置自動補正装置
EP0417836A1 (fr) * 1989-09-12 1991-03-20 HOLDING M. BROUWER & CO. B.V. Machine à poinçonner

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1527949A (fr) * 1967-04-06 1968-06-07 Dispositif de commande automatique d'une machine-outil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2141521A1 (de) * 1971-08-19 1973-03-22 Trumpf & Co Einstelleinrichtung fuer die hublage eines hin- und herbewegbaren werkzeuges
JPH02151400A (ja) * 1988-12-01 1990-06-11 Aida Eng Ltd プレスのスライド位置自動補正装置
EP0417836A1 (fr) * 1989-09-12 1991-03-20 HOLDING M. BROUWER & CO. B.V. Machine à poinçonner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 399 (M - 1017)<4342> 29 August 1990 (1990-08-29) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1782943A3 (fr) * 2005-11-02 2009-06-03 Fette GmbH Procédé et système de mesure pour produire une référence dans une presse à poudre
US7803294B2 (en) 2005-11-02 2010-09-28 Fette Gmbh Method and measuring system for obtaining a reference for a powder press
CN110202062A (zh) * 2019-04-23 2019-09-06 滁州达世汽车配件有限公司 一种汽车后部防护板冲压模具的纠正装置

Also Published As

Publication number Publication date
DE59303198D1 (de) 1996-08-14
DE4301309C2 (de) 1994-10-13
EP0607498B1 (fr) 1996-07-10
DE4301309A1 (de) 1994-07-21

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