EP3115191B1 - Verfahren und vorrichtung zum reduzieren des schnittschlags in einer feinschneidpresse - Google Patents

Verfahren und vorrichtung zum reduzieren des schnittschlags in einer feinschneidpresse Download PDF

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Publication number
EP3115191B1
EP3115191B1 EP15002037.8A EP15002037A EP3115191B1 EP 3115191 B1 EP3115191 B1 EP 3115191B1 EP 15002037 A EP15002037 A EP 15002037A EP 3115191 B1 EP3115191 B1 EP 3115191B1
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EP
European Patent Office
Prior art keywords
pressure
main piston
valve
hydraulic
working
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.)
Active
Application number
EP15002037.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3115191A1 (de
Inventor
Hans-Ruedi Honegger
Andreas Dipl.-Ing. Walther
Alex Wehrli
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.)
Feintool International Holding AG
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Feintool International Holding 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 Feintool International Holding AG filed Critical Feintool International Holding AG
Priority to EP15002037.8A priority Critical patent/EP3115191B1/de
Priority to ES15002037T priority patent/ES2839075T3/es
Priority to JP2016133065A priority patent/JP6815106B2/ja
Priority to CN201610525666.8A priority patent/CN106334745B/zh
Priority to KR1020160084622A priority patent/KR102333501B1/ko
Priority to US15/203,404 priority patent/US10500628B2/en
Publication of EP3115191A1 publication Critical patent/EP3115191A1/de
Application granted granted Critical
Publication of EP3115191B1 publication Critical patent/EP3115191B1/de
Active 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
    • 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
    • B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
    • B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically
    • 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
    • B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
    • 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
    • B21D28/20—Applications of drives for reducing noise or wear
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0076—Noise or vibration isolation 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
    • B30B15/16—Control arrangements for fluid-driven presses
    • 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
    • B30B15/22—Control arrangements for fluid-driven presses controlling the degree of pressure applied by the ram during the pressing stroke

Definitions

  • the invention relates to a method for reducing the cutting impact in a fineblanking press equipped with a hydraulic main drive, in which a main piston, guided in a main cylinder space of the foot piece and carrying a table top, executes a stroke movement in rapid traverse between BDC and TDC and in the power stroke the cutting or forming operation, wherein the pressure chambers of the main piston are acted upon by a working pressure of a hydraulic fluid from a hydraulic system which is predetermined by a central controller and generated by a hydraulic pump unit.
  • the invention further relates to a device for carrying out the method, with a master cylinder chamber arranged in the foot piece of a hydraulically driven fineblanking press, in which the main piston / ram, which can be acted upon by hydraulic fluid via pressure chambers, executes a stroke movement between BDC and TDC in the direction of the stroke axis and carries a table top is performed, and a hydraulic system comprising at least one hydraulic pump unit for supplying the pressure chambers with the hydraulic fluid set to a predetermined working pressure by a central controller.
  • the cutting impact on presses and its causes are well known.
  • the cutting process is divided into a clamping process in which the sheet metal material to be cut is clamped between the cutting plate and hold-down device (guide plate) and then the cutting punch is placed on the sheet material, a pretensioning process in which the cutting system made of sheet material, cutting tool and press is elastic until it is reached the yield point is preloaded, a plastic deformation process in which the sheet material is cold-hardened with an increase in the cutting force to a maximum value and, after reaching the limit of the deformability, the sheet material breaks through with crack formation, a separation process in which the cut part is separated from the sheet material, the cutting force suddenly drops and the potential energy stored in the system is released, as a result of which the tool and press are suddenly relieved in the form of the cutting impact, and the release of elastic tensions, which cause the material to spring back in the area of the cut surface and lead to wear of the punch and cutting plate.
  • the at least one double-sided comprises actuatable piston-cylinder unit for driving a press ram, the drive piston being acted upon by means of a hydraulic medium in the sense of a displacement.
  • a hydraulic accumulator unit is provided which has the maximum working pressure and supplies the piston of the piston-cylinder unit with hydraulic medium of the same pressure on both sides.
  • the known drive has a double-acting working cylinder, the piston of which has a first working surface effective in the retraction direction and a second working surface effective in the extending direction, each delimiting a pressure chamber, with at least one of the working surfaces for retracting and extending the piston into and out of the working cylinder two different pressures can be switched on by means of an actuator.
  • the hydraulic drive has an actuating unit which optionally enables a throttled return flow of hydraulic medium from the first pressure chamber delimited by the first working surface, the drive having control means with which the actuating unit can be controlled in this way during or before a sudden acceleration of the piston due to its sudden force relief is that by throttling the return flow of hydraulic medium from the first pressure chamber directly or indirectly caused by the actuating unit, hydraulic damping of the movement of the piston takes place.
  • the DE 10 2006 039 463 A1 propose to reduce the cutting impact by having two different opposing forces acting on the ram during a cutting process within a closed hydraulic system, which forces are switched over depending on the ram path.
  • JP S60 244500 A a method and a device for reducing the cutting impact, but in which the main cylinder space is arranged in the head piece.
  • the invention is based on the object of creating a method and a device of the type mentioned on fineblanking presses with which the force required for cutting impact reduction can be generated as a counterforce directly in the pressure chamber of the drive piston, so that the counterforce can be generated directly acts on the cutting punch and simplifies the structure of the press, saves costs, additional external hydraulic-mechanical means for reducing the cutting impact are omitted and the loads on the press and the tool can be reduced.
  • the solution according to the invention is based on the basic idea of regulating the working pressure in the first (upper) pressure chamber as a function of the working pressure in the second (lower) pressure chamber of the main piston via a pressure limiting function.
  • the counterforce can be adapted particularly sensitively and precisely to the size of the cutting stroke by regulating the pressure in the first pressure chamber as a function of the working pressure in the second pressure chamber.
  • the working pressure in the second pressure chamber of the main piston during the power stroke with the central control via a controllable proportional valve, at least one pressure sensor for pressure detection, at least one pressure limiting valve for limiting the pressure of the delivery flow and a proportional valve for the delivery volume and the hydraulic pump unit is set.
  • the TDC position of the main piston is regulated with the central control so that the delivery volume of the hydraulic pump unit is regulated back before TDC is reached.
  • sensors are used as the distance measuring unit for detecting the position of the main piston, which work without contact and without wear and which are insensitive to moisture, oils and other contamination.
  • the main piston has working surfaces protruding like a disk disk, which in the main cylinder space divide the first and second pressure chambers superimposed like a circular ring, each of which is separate from the central one for the detection of the pressure in the pressure chambers
  • Control connected pressure transducers are assigned, which are connected to a proportional valve via a pressure-controlled 4/3-way proportional valve for pressure limitation of a tank valve and an amplifier, and that the main piston is connected to the central control connected distance measuring unit for detecting the TDC position of the main piston is assigned.
  • a relief channel which can be opened and closed with the tank valve for discharging the hydraulic fluid displaced from the first pressure chamber and first fluid channels, which are each connected via a bypass channel to the second fluid channels led into the second pressure chamber, open into the first pressure chamber,
  • a proportional valve for opening and closing the bypass channels are inserted, at least one of the second fluid channels for supplying hydraulic fluid of a predetermined pressure from the hydraulic system into the second pressure chamber being connected to a supply channel and a branch channel.
  • a further advantageous embodiment of the device according to the invention provides that the second pressure chamber of the main piston during the power stroke via a controlled built-in valve, at least one pressure transducer for pressure detection, at least one pressure limiting valve to limit the pressure of the flow to adjust the flow rate with the hydraulic pump unit and the first pressure chamber via the tank valve is connected to a collecting tank.
  • the main piston has the same or differently sized working surfaces, so that both synchronous pistons and other pistons can be used depending on the application.
  • the proportional valves are pressure-controlled built-in valves which can be used in the power stroke ducts and the bypass duct and are easy to assemble.
  • the hydraulic pump unit comprises at least the proportional valve for setting the flow rate, at least the pressure sensor for controlling the proportional valve and at least the pressure limiting valve for limiting the pressure of the flow rate.
  • the Fig. 1 shows the progression of the cutting force when shearing a full-edged workpiece according to the prior art ( R.-A. Schmidt, "Forming and Fine Cutting", Carl Hanser-Verlag, 2007, pp. 144-157 ). Then the cutting process first runs through an area of elastic deformation of the material (section I) and of the press frame, in which the cutting force Fs increases linearly without any plastic deformation of the material. As the punch continues to penetrate the material, the material begins to flow plastically, with the cutting force Fs increasing further (area II).
  • the separation phase is characterized by the appearance of cracks in the material, which indicate that the material has reached its deformation capacity (area III).
  • the material breaks through and the cutting force Fs drops abruptly, causing the cutting impact, with which the tool and the press are suddenly relieved.
  • the system (tool, press) begins to vibrate like a relieved spring, whereby the vibration behavior depends on the natural frequencies of the tool and the press (area IV). This is where the invention comes in.
  • the Fig. 2 shows a perspective view of a hydraulically driven fine blanking press 1, the main drive 2 of which basically enables a lifting movement between a bottom dead center UT and an upper dead center OT in the direction of the lifting axis HU from bottom to top.
  • the press frame 3 of the press 1 comprises a head piece 4, a foot piece 5, box-shaped hollow columns 6 and tie rods 7.
  • the main drive 2 is supplied with hydraulic fluid from a hydraulic system 24 via hydraulic lines 41.
  • a table top 8 is arranged on the top OS of the base 5, which carries the tool lower part, not shown.
  • Approximately in the middle of the foot piece 5 are two opposing rapid lift cylinders 9 aligned parallel to the lift axis HU, each of which accommodates a rapid lift piston whose piston rod 10 is connected to a carrier 11 which is attached to a side wall 12 of the table top 8 so that the table top 8 with The lower tool part can be raised in rapid traverse in the direction of TDC or lowered in the direction of BDC.
  • the Figure 4a , 4b and 5 show the spatial position of the fluid channels 19a to 19h and the relief channel 33 in the foot piece 5 in a transparent representation and in section along line AA of FIG Fig. 3 .
  • a master cylinder space 13 is formed in the foot piece 5, the axis HA of which lies on the stroke axis HU of the fineblanking press and accommodates the double-acting main piston 14.
  • the main piston 14 has a cylindrical shaft 15, which has upper and lower working surfaces 16a and 16b projecting like a disc like a disk disk perpendicular to the axis HA, which divide the main cylinder chamber 13 into a first (upper) pressure chamber 17a and a second (lower) pressure chamber 17b with a low lift height, so that the foot piece 5 is compact and has a low overall height.
  • the master cylinder space 13 and thus the upper pressure space 17a is closed in a pressure-tight manner by a cover 18 which is fastened to the foot piece 5.
  • the cover 18 is designed so that it also forms a fixed stop 42 for the work surface 16a at top dead center OT.
  • a pressure-controlled proportional valve 21a, 21b, 21c and 21d is used as a built-in valve in each of the second (lower) fluid channels 19e to 19h, which closes the respective bypass channel 20 when the second pressure chamber 17b is pressurized with hydraulic fluid of a predetermined pressure.
  • the lower fluid channel 19e is connected to a feed channel 23 lying parallel to the stroke axis HU in the foot piece 5 and to a branch channel 25 which branches off from the latter and via which the hydraulic system 24, not shown further, is connected.
  • a relief channel 33 opens into the first pressure chamber 17a, into which a tank valve 26 is inserted as a built-in valve for opening and closing the relief channel 33.
  • the tank valve 26 is in the open position when the hydraulic fluid located in the first pressure chamber 17a is displaced in the power stroke.
  • the main piston 14 executes a corresponding stroke movement in the power stroke and effects the cutting and forming process.
  • a displacement measuring unit 28 for example in the form of an eddy current sensor, is assigned to the main piston 14.
  • the displacement measuring unit 28 can be arranged along the first (upper) pressure chamber 17 a in the foot piece 5.
  • the distance measuring unit 28 transfers the position data to the central controller 29 for further processing.
  • Fig. 6 shows the hydraulic line 30 for the power stroke of the main piston 14 and the hydraulic line 31 for the cutting impact control.
  • the hydraulic system 30 for the power stroke comprises a hydraulic pump unit 32, which has at least one proportional valve for adjusting the flow rate, at least one pressure limiting valve 34 for limiting the pressure of the flow and at least one pressure sensor 35 for pressure detection for limiting the output and forwarding the pressure value to the central controller 29 to control the Pressure relief valve 34 is assigned, a controlled built-in valve 36 which releases the hydraulic fluid supplied to the second (lower) pressure chamber 17b for the power stroke, a pressure sensor 37 for permanent detection of the working pressure PU in the second (lower) pressure chamber 17b and the pressure chambers 17a and 17b of the main piston 14.
  • the hydraulic line 31 includes the proportional valve 21a to 21d inserted in the fluid channels 19e to 19h, which opens or closes the relief channel 33, a pressure transducer 38 assigned to the first (upper) pressure chamber 17a for permanent detection of the working pressure PO in the first (upper) pressure chamber 17a, which forwards the detected pressure values to the central controller 29 for processing, an operational amplifier 39 which is connected to both the pressure sensor 37 for the second (lower) pressure chamber 17b and the pressure sensor 38 for the first (upper) pressure chamber 17a as well as a pressure-controlled 4 / 3-way proportional valve 40 is connected, which keeps a tank valve 26 open in the power stroke or open under pressure control.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Punching Or Piercing (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Press Drives And Press Lines (AREA)
EP15002037.8A 2015-07-06 2015-07-06 Verfahren und vorrichtung zum reduzieren des schnittschlags in einer feinschneidpresse Active EP3115191B1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP15002037.8A EP3115191B1 (de) 2015-07-06 2015-07-06 Verfahren und vorrichtung zum reduzieren des schnittschlags in einer feinschneidpresse
ES15002037T ES2839075T3 (es) 2015-07-06 2015-07-06 Procedimiento y dispositivo para reducir el impacto de corte en una prensa de corte de precisión
JP2016133065A JP6815106B2 (ja) 2015-07-06 2016-07-05 精密打抜プレス内における切断衝撃の減少のための装置及び方法
CN201610525666.8A CN106334745B (zh) 2015-07-06 2016-07-05 用于在精冲压力机中降低冲裁冲击的方法和装置
KR1020160084622A KR102333501B1 (ko) 2015-07-06 2016-07-05 정밀 블랭킹 프레스에서 절단 충격을 감소시키기 위한 방법 및 장치
US15/203,404 US10500628B2 (en) 2015-07-06 2016-07-06 Method and apparatus for reducing cutting impact in a precision blanking press

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15002037.8A EP3115191B1 (de) 2015-07-06 2015-07-06 Verfahren und vorrichtung zum reduzieren des schnittschlags in einer feinschneidpresse

Publications (2)

Publication Number Publication Date
EP3115191A1 EP3115191A1 (de) 2017-01-11
EP3115191B1 true EP3115191B1 (de) 2020-11-18

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Application Number Title Priority Date Filing Date
EP15002037.8A Active EP3115191B1 (de) 2015-07-06 2015-07-06 Verfahren und vorrichtung zum reduzieren des schnittschlags in einer feinschneidpresse

Country Status (6)

Country Link
US (1) US10500628B2 (zh)
EP (1) EP3115191B1 (zh)
JP (1) JP6815106B2 (zh)
KR (1) KR102333501B1 (zh)
CN (1) CN106334745B (zh)
ES (1) ES2839075T3 (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108555106A (zh) * 2018-06-08 2018-09-21 中山市新泰五金制品有限公司 一种油压缓冲气垫
EP3666410A1 (en) 2018-12-13 2020-06-17 Lapmaster Wolters GmbH Fine blanking press and method for operating a fine blanking press
ES2944440T3 (es) 2019-04-18 2023-06-21 Lapmaster Wolters Gmbh Método para operar un sistema de troquelado fino
EP3736061A1 (en) 2019-05-06 2020-11-11 Lapmaster Wolters GmbH Fine blanking system and method for operating the same
EP3831590A1 (en) 2019-12-05 2021-06-09 Lapmaster Wolters GmbH Press ram for a fine blanking press

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DE2621726C2 (de) 1976-05-15 1978-12-07 L. Schuler Gmbh, 7320 Goeppingen Schnittschlagdämpfungseinrichtung an Pressen
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Also Published As

Publication number Publication date
CN106334745B (zh) 2019-06-21
ES2839075T3 (es) 2021-07-05
JP2017013132A (ja) 2017-01-19
US10500628B2 (en) 2019-12-10
JP6815106B2 (ja) 2021-01-20
KR102333501B1 (ko) 2021-12-01
US20170129000A1 (en) 2017-05-11
EP3115191A1 (de) 2017-01-11
KR20170005767A (ko) 2017-01-16
CN106334745A (zh) 2017-01-18

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