EP3453468A1 - Verfahren zur steuerung von lokalen kräften bei bleichstanzwerkzeugen und differenzierte niederhaltevorrichtung zur umsetzung davon - Google Patents

Verfahren zur steuerung von lokalen kräften bei bleichstanzwerkzeugen und differenzierte niederhaltevorrichtung zur umsetzung davon Download PDF

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Publication number
EP3453468A1
EP3453468A1 EP17894656.2A EP17894656A EP3453468A1 EP 3453468 A1 EP3453468 A1 EP 3453468A1 EP 17894656 A EP17894656 A EP 17894656A EP 3453468 A1 EP3453468 A1 EP 3453468A1
Authority
EP
European Patent Office
Prior art keywords
piston
hold
stem
housing
differentiated
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.)
Ceased
Application number
EP17894656.2A
Other languages
English (en)
French (fr)
Other versions
EP3453468A4 (de
Inventor
Rinat Muzakhitovitch GILFANOV
Sergei Nikolaevich KNYAZEV
Petr Valentinovich TRUSOV
Anton Yurievich YANTS
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.)
Obshchestvo S Ogranichennoy Otvetstvennost'yu "samer" (ooo "samer")
Original Assignee
Obshchestvo S Ogranichennoy Otvetstvennost'yu "samer" (ooo "samer")
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 Obshchestvo S Ogranichennoy Otvetstvennost'yu "samer" (ooo "samer") filed Critical Obshchestvo S Ogranichennoy Otvetstvennost'yu "samer" (ooo "samer")
Publication of EP3453468A1 publication Critical patent/EP3453468A1/de
Publication of EP3453468A4 publication Critical patent/EP3453468A4/de
Ceased 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
    • B21D24/04—Blank holders; Mounting means therefor
    • B21D24/08—Pneumatically or hydraulically loaded blank holders
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks
    • 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
    • B21D24/04—Blank holders; Mounting means therefor
    • 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

Definitions

  • the invention relates to machine building, namely to metal forming, and can be used in dies of sheet stamping to control local forced under a specified algorithm.
  • the dies for implementation of each operation in this extension method comprise the following main working parts: punch, counter die and hold-down.
  • the punch is fastened on the die's fixed lower plate, and the counter die - on the movable upper plate.
  • Inside the counter die there is an ejector of stamped semi-finished product, acting from a pusher by means of a die or press device.
  • the hold down rests via the pushers onto the press bed or the die buffer, which provides the required force for pressing of the parent sheet flange and pushing-in of the inclined wall of the previous semi-finished product into the counter die for extension of the subsequent semi-finished product.
  • a disadvantage of this method is the limited technological capabilities related to need for new jigging in each machining step, which also needs replacement during change of the manufactured part.
  • a device is known for adjustment of bed load and a press machine, containing a device for adjustment of bed load ( RF invention patent No. 2401742 , publ. on 10.04.2010, Bull. No. 10), containing a bed under the press slide.
  • the adjustment device comprises a hydraulic cylinder, forming the die bed, a hydraulic control valve connected with this cylinder, a hydraulic source, an opening speed adjustment unit, a unit for determination of die bed lowering speed, a signal correction unit.
  • the shortcomings of the described device include restricted technological capabilities, related to the fact that local forces of the hold-down in its different points are constant but may vary in time. Moreover, special equipment is required for control of local forces.
  • the said methods are implemented using the standard elements, namely mechanical and gas springs, arranged in the die between the hold-down and the die block part (lower or upper plate), and/or damping devices built into the press.There is a known design of a damping device with a pneumatic spring ( RF useful model patent No. 81541 , publ.
  • the stem guide and the back-up ring have radial channels connected with the cavity; the first channel serves as an oil supply line, the second serves for air discharge from the cavity and has a return valve, additionally, the pneumatic spring comprises a unit for cavity filling with lubricating fluid.
  • the disadvantage of this design is the constancy of the algorithm for control of local force transfer upon press impact on the hold-down, related to the fact that local forces are transferred according to linear law depending on cylinder stem motion.
  • the suggested technical object is aimed at increasing the technological capabilities of the sheet stamping process and accuracy of manufactured parts, as well as the possibility of its use on universal equipment.
  • the technical effect is achieved by the installation of a differentiated hold-down device into the die; the device ensures the following during workpiece forming: adjustment of metal flow and movement from the periphery into the deformation zone by way of local force control.
  • a differentiated hold-down device characterized in that the hold-down is made of sectors, fastened on a plate, and each hold-down sector is equipped with a hydraulic device for force transfer under a specified algorithm.
  • the differentiated hold-down device comprises a hydraulic device for force transfer under a specified algorithm, comprises a housing, a stem with a piston, the housing comprises rings with an internal surface of variable cross-section, which together with the piston's peripheral surface form a clearance that may change during the piston movement in relation to the housing.
  • the differentiated hold-down device may comprise a hydraulic device for force transfer under a specified algorithm, which consists of a housing, a stem with piston, the stem is hollow and has radial holes, while the piston is provided with a movable ring configured to close the piston hole, the housing comprises an axle of variable cross-section, one end whereof is made in the form of a piston placed in the stem cavity, wherein the movable ring together with the axle of variable cross-section form a clearance that may change during movement of the hollow stem with the piston and ring in relation to the axle.
  • a hydraulic device for force transfer under a specified algorithm which consists of a housing, a stem with piston, the stem is hollow and has radial holes, while the piston is provided with a movable ring configured to close the piston hole
  • the housing comprises an axle of variable cross-section, one end whereof is made in the form of a piston placed in the stem cavity, wherein the movable ring together with the axle of variable cross-section form a clearance that may change during
  • Fig.1 shows the die of sheet stamping with a differentiated hold-down device
  • Fig.2 the die of sheet stamping with a differentiated hold-down device, section A-A
  • Fig.3 the hydraulic device for force transfer under a specified algorithm according to the first embodiment
  • Fig.4 the hydraulic device for force transfer under a specified algorithm according to the second embodiment
  • Fig.5 the die of sheet stamping with a differentiated hold-down device at the beginning of the shaping process
  • Fig.6 the hydraulic device for force transfer under a specified algorithm according to the first embodiment at the beginning of the shaping process
  • Fig.7 the hydraulic device for force transfer under a specified algorithm according to the second embodiment at the beginning of the shaping process
  • Fig.8 the die of sheet stamping with a differentiated hold-down device in the shaping process
  • Fig.9 the hydraulic device for force transfer under a specified algorithm according to the first embodiment in the shaping process
  • Fig.10 the hydraulic device for force transfer under a specified algorithm according to
  • a differentiated hold-down device 5 is installed on upper plate 1; this device comprises several hydraulic devices 6 for force transfer under a specified algorithm and hold-down 7.
  • Hydraulic device 6 for force transfer under a specified algorithm comprises housing 8, stem 9, one end whereof is fastened on upper plate 1, while the other is in the form of piston 10.
  • Cover 13 is installed on the housing butt surface.
  • spring ring 14 restricting the travel of air piston 15 with sealing rings 16, which is installed between housing 8 and stem 9.
  • Spring 17 is installed between air piston 15 and cover 13.
  • device 6 for load transfer under a specified algorithm which comprises hollow stem 18 with radial holes 19, capable of moving along the axle of variable cross-section 20, one end whereof is made in the form of piston 21 with seals 22, while the other end is fixed in housing 8 by means of threaded joint 23.
  • Stem 18 has piston 24 with holes 25 along its perimeter and sealing rings 26.
  • Ring 27 is installed on one of the butts of piston 24.
  • ring 27 together with axle 20 forms clearance ⁇ .
  • Hold-down 7 consists of separate sectors 29, rigidly fastened on common steel plate 30, to which housings 8 of hydraulic devices 6 for force transfer under a specified algorithm are fastened.
  • housings 8 are located opposite the corresponding sectors 29.Let us consider the application of the method to control local forces in dies of sheet stamping and the operation of the differentiated hold-down device according to the example of shaping of a box-section part.
  • the standard sheet stamping technology provides for the use of gas or mechanical springs, wherein local forces are transferred to the rigid hold-down.
  • Value of hold-down force is selected on the basis of assurance of metal flow in places of dislocation of the maximum internal stresses at the initial shaping moment and applies to the entire surface of hold-down contact with the part. As the springs are compressed according to the slide, the force increases and does not depend on the value required for the optimal shaping process.
  • Stamping is performed by moving upper plate 1 together with punch 3 and differentiated hold-down device 5 in relation to lower plate 2, whereon counter die 4 is fastened.
  • a differentiated hold-down device 5 squeezes the workpiece with the design forces provided by devices 6 for force transfer under a specified algorithm.
  • the force value on each of sectors 29 is different and corresponds to the optimal value for the shaping process at the given time moment and in the given zone of hold-down 7.
  • Change of force for each device 6 for force transfer under a specified algorithm is determined according to the value of clearances ⁇ or ⁇ .
  • the punch comes to the workpiece surface and starts deforming it.
  • changes of local forces in the sectors of hold-down 29 are necessary to ensure the optimal shaping process.
  • Pressure value in this case is determined by motion speed of stem 9 and clearance ⁇ between the inner surface of variable cross-section 12 of rings 11 and the peripheral surface of piston 10.
  • Motion speed of stem 9 depends on motion speed of the press slide and may vary up to zero.
  • Rings 11, installed inside housing 8, are made with internal surfaces of variable cross-section 12.
  • clearance ⁇ between them changes.
  • Change of clearance ⁇ allows for adjusting the speed of working fluid overflow from the cavity under piston 10 into the cavity above the piston and, respectively, controls the pressure in the cavity under piston 10, which via housing 8 is transferred to the sectors of hold-down 29.
  • Shape of the internal surfaces of rings 11 is determined by calculation so as to ensure the optimal shaping process for the given hold-down sector and, together with the peripheral surface of piston 10, assigns an algorithm for control of force transfer from the press slide via the upper plate to a specific sector of hold-down 29.
  • the number of rings 11 depends on control algorithm complexity.
  • the working fluid in the cavity above the piston moves air piston 15, by compressing spring 17.
  • Shape of the internal surfaces of rings 11 is determined by calculation so as to ensure the optimal shaping process for the given hold-down sector and, together with the peripheral surface of piston 10, assigns an algorithm for control of force transfer from the press slide via the upper plate to a specific sector of hold-down 29.
  • Axle 20, having a variable cross-section, is fastened to the bottom of housing 8 by thread 23.
  • the value of clearance ⁇ changes.
  • Change of clearance ⁇ allows for adjusting the speed of working fluid overflow from the cavity under piston 24 into the cavity above the piston and, respectively, controls the pressure in the cavity under piston 24, which via housing 8 is transferred to the sectors of hold-down 29.
  • Shape of the surface of axle 20 is determined by calculation so as to ensure the optimal shaping process for the given sector of hold-down 29 and, together with the hole of ring 29, assigns an algorithm for control of force transfer from the press slide via upper plate 1 to a specific sector of hold-down 29.
  • the working fluid in the cavity above the piston moves air piston 15, by compressing spring 17.
  • the working fluid above the cavity of piston 10 under the weight of housing 8 and hold-down 7, as well as the accumulated energy of spring 17 moves ring 27 up to the extreme position, limited by ring 28, and flows through holes 25 from the cavity above the piston into the cavity under the piston.
  • Ring 14 is configured to restrict the travel of air piston 15. Sealing rings 16 prevent the ingress of working fluid into the air chamber formed by air piston 15, cover 13 and internal walls of housing 8. Sealing rings 22 prevent working fluid ingress into the intracavity of stem 18. The experimental results have showed a considerable change in local forces upon clearance change.
  • Fig. 18 and Fig. 19 show graphical dependences of change in local forces on clearance of hydraulic device 6 for force transfer under a specified algorithm, built according to the first and second embodiments respectively. Analysis of the graphical dependences showed that the rational use region for the device, manufactured according to the first embodiment, is in the force range from 0.5 tons to 2.5 tons, and for the device according to the second embodiment - from 2 tons to 11 tons. Thus, we may conclude that these device may complement the operation of each other and be used in the differentiated hold-down device depending on the specified conditions of the shaping process.
  • the positive result from the suggested technical solution is as follows.
EP17894656.2A 2017-07-25 2017-08-30 Verfahren zur steuerung von lokalen kräften bei bleichstanzwerkzeugen und differenzierte niederhaltevorrichtung zur umsetzung davon Ceased EP3453468A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2017126796A RU2685624C2 (ru) 2017-07-25 2017-07-25 Способ листовой штамповки и дифференцированное прижимное устройство штампа листовой штамповки
PCT/RU2017/000632 WO2019022634A1 (ru) 2017-07-25 2017-08-30 Способ формообразования листовой заготовки и устройство для его осуществления

Publications (2)

Publication Number Publication Date
EP3453468A1 true EP3453468A1 (de) 2019-03-13
EP3453468A4 EP3453468A4 (de) 2019-10-09

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Application Number Title Priority Date Filing Date
EP17894656.2A Ceased EP3453468A4 (de) 2017-07-25 2017-08-30 Verfahren zur steuerung von lokalen kräften bei bleichstanzwerkzeugen und differenzierte niederhaltevorrichtung zur umsetzung davon

Country Status (5)

Country Link
EP (1) EP3453468A4 (de)
KR (1) KR20200034916A (de)
CN (1) CN109641256A (de)
RU (1) RU2685624C2 (de)
WO (1) WO2019022634A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2723857C1 (ru) * 2019-04-29 2020-06-17 Общество с ограниченной ответственностью "Кипер" Устройство для управления секторным прижимом штампа для листовой штамповки
CN110421639A (zh) * 2019-09-06 2019-11-08 东莞市日源盛橡胶绝缘制品有限公司 一种带r角鼠标脚垫的生产设备及其生产工艺
CN110899448B (zh) * 2019-12-03 2021-01-12 哈尔滨工业大学 一种压边力分区加载的装置及方法
CN112775275B (zh) * 2021-01-11 2022-12-23 芜湖市铭镁精密模具有限公司 一种高精度五金冲压模具

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FR1361134A (fr) * 1963-06-25 1964-05-15 Bbc Brown Boveri & Cie Système de commande pneumatique à amortissement par air
SU524584A1 (ru) * 1975-02-27 1976-08-15 Московский авиационный технологический институт им.К.Э.Циолковского Штамп дл выт жки цилиндрических изделий
SU776713A1 (ru) * 1978-12-14 1980-11-07 Предприятие П/Я М-5671 Устройство дл глубокой выт жки полых деталей
SU1324724A1 (ru) * 1986-04-10 1987-07-23 Предприятие П/Я Р-6601 Штамп дл изготовлени полых деталей
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JP2856107B2 (ja) * 1995-05-22 1999-02-10 トヨタ自動車株式会社 プレス加工方法およびプレス加工装置
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RU2201830C2 (ru) * 2001-05-08 2003-04-10 Открытое акционерное общество "ГАЗ" Штамп для вытяжки деталей сложной формы
JP4986112B2 (ja) 2006-02-27 2012-07-25 株式会社Ｉｈｉ クッション荷重制御装置およびクッション荷重制御装置を備えたプレス機械
RU81541U1 (ru) * 2008-10-13 2009-03-20 Государственное Образовательное Учреждение Высшего Профессионального Образования "Омский Государственный Технический Университет" Пневмопружина
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Also Published As

Publication number Publication date
RU2685624C2 (ru) 2019-04-22
KR20200034916A (ko) 2020-04-01
WO2019022634A1 (ru) 2019-01-31
CN109641256A (zh) 2019-04-16
RU2017126796A3 (de) 2019-01-25
RU2017126796A (ru) 2019-01-25
EP3453468A4 (de) 2019-10-09

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