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US20080290973A1 - Magnetic holding apparatus for holding workpieces - Google Patents

Magnetic holding apparatus for holding workpieces Download PDF

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Publication number
US20080290973A1
US20080290973A1 US11/977,311 US97731107A US2008290973A1 US 20080290973 A1 US20080290973 A1 US 20080290973A1 US 97731107 A US97731107 A US 97731107A US 2008290973 A1 US2008290973 A1 US 2008290973A1
Authority
US
United States
Prior art keywords
magnetic
working face
reversible
holding apparatus
slots
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.)
Abandoned
Application number
US11/977,311
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English (en)
Inventor
Uttam Sarda
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.)
East Coast Enterprisers Ltd
Original Assignee
Individual
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 Individual filed Critical Individual
Assigned to EAST COAST ENTERPRISER LTD reassignment EAST COAST ENTERPRISER LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SARDA, UTTAM
Publication of US20080290973A1 publication Critical patent/US20080290973A1/en
Priority to US12/692,395 priority Critical patent/US7999645B2/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
    • B25B11/002—Magnetic work holders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/15—Devices for holding work using magnetic or electric force acting directly on the work
    • B23Q3/154—Stationary devices
    • B23Q3/1543—Stationary devices using electromagnets

Definitions

  • the present invention relates to an electro permanent magnetic work holding apparatus for holding workpieces magnetically and/or mechanically.
  • This invention more particularly relates to an electro permanent magnetic (hereinafter abbreviated as ‘EPM’ in this specification for the sake of brevity and convenience) work holding apparatus having a monolithic ferrous working face with slots of desired shape and configuration separating the magnetic poles, thereby rendering the apparatus suitable for holding the workpieces both magnetically and/or mechanically in the course of working/machining/anchoring.
  • EPM electro permanent magnetic
  • Such slots are made around the perimeter of the poles, thereby minimizing reduction in active magnetic area of the working face.
  • the subject invention also pertains to a work holding apparatus with at least one non-reversible permanent magnet, and at least another reversible permanent magnet suitably placed, which may be commissioned for work holding by switching electrically, whereby a workpiece material is held in place without the use of additional pole separators.
  • a magnetic work holding apparatus is often used as a worktable, whereby a workpiece to be machined can be held securely on the worktable by magnetic force, and then machining operation may be performed on the workpiece.
  • the principal property of a magnet is its capability to attract ferromagnetic materials resulting from flow of magnetic energy called “flux” between magnetic north and south poles.
  • flux ferromagnetic material resulting from flow of magnetic energy
  • the “flux” passes through and the workpiece gets attracted.
  • the intensity of attraction or pull becomes stronger with the decrease in the distance of separation between the workpiece and the magnet.
  • strength of attraction of a magnet is the function of the quantum of induction of magnetic flux into the workpiece. It has also been observed that smooth surfaces are better attracted and held in position in comparison to uneven or rough surface.
  • Electro permanent magnetic (EPM) work holding apparatuses of flux reversal type are known in which a magnetic circuit is activated or deactivated by reversing the poles of the permanent magnets of the device.
  • EPM Electro permanent magnetic
  • This is a combination of permanent magnetic and electro magnetic devices: it presents the advantages of the latter without the disadvantages of the former.
  • These devices uses intrinsic energy of the permanent magnetic device but instead of being switched “ON” or “OFF” mechanically, it requires electrical pulse similar to electro magnetic devices but only momentarily delivered by an electrical winding. Once switched “ON”, these devices provide magnetic force for infinite duration of time independent of any external energy source. For instance, U.S. Pat. No.
  • 4,507,635 granted to Michele Cardone of Milan, Italy pertains to a magnetic anchoring apparatus, comprising in combination: an external ferromagnetic crown provided with a base plate and lateral walls; at least one group of four pole pieces defining pairs of corresponding poles of an anchoring surface, said pole pieces presenting their longitudinal axes at right angles to the base place and in correspondence with the apexes of a square.
  • the apparatus comprises a plurality of permanent magnets for feeding the aforesaid poles, interposed between the pole pieces, and between the latter and said ferromagnetic crown.
  • Types of magnets presently available have magnetic poles (north and south) which are separated by non-magnetic insulators between the individual poles.
  • the magnetic insulating material generally used may be selected from the group of epoxy, aluminum, brass, stainless steel, etc.
  • the working surface of the existing magnetic work holding device is not stable when there is a rise in temperature during machining operation. This difference causes unstable surface and often creates small opening(s) for coolant (sometimes flooded coolant fluid is used during machining) to enter inside the work holding device and short circuit the winding/joints or hamper with the insulation resistance of the winding.
  • coolant sometimes flooded coolant fluid is used during machining
  • the present invention aims at circumventing and finding an effective solution to the difficulties mentioned above.
  • T inverted “T”
  • dumb-bell truncated dumb-bell
  • Yet another object of this invention is to disclose a magnetic work holding apparatus with a ferrous monolithic working face capable of being used for anchoring of ferrous metal parts, components or entire apparatus magnetically.
  • an EPM work holding apparatus for holding workpieces magnetically and/or mechanically, comprising of a base plate and a ferrous monolithic working face, the said base plate having a pocket or recess which houses the reversible permanent magnets and electrical windings, the said working face having magnetic poles which are demarked by slots, and on the opposite side of the said working face recesses are provided beneath the said slots for housing the non-reversible permanent magnets.
  • the present invention successfully solves the above problems by re-casting the design of the work holding equipment by machining out the top working face and the side walls from a monolithic ferrous block, which renderes the structure quite rigid.
  • the monolithic structure of the subject invention also has recesses for demarking the magnetic poles, which eliminates the need to use any filler material. Furthermore, instead of a plurality of pole pieces required in conventional designs depending on the number of poles, only a single ferrous block needs to be handled, which makes the manufacture quite easy.
  • the work holding device is usually provided with tee-slots, resembling an inverted Tee, running across the length and/or width of the work holding apparatus, which not only separate the magnetic poles but also enables workpieces or jobs to be held either magnetically and/or mechanically.
  • the slots may also be made in the shape of a truncated dumb-bell in lieu of a tee-slot, or any other suitable shape for convenience of operation/anchoring, the latter being preferred for convenience of operation and easy availability of clamping equipments.
  • Tee-slots enable diamagnetic or paramagnetic materials like brass, aluminum, stainless steel, copper, etc. to be clamped and worked upon.
  • slots preferably configured as “T” slots, enables secure handling of workpieces even for diamagnetic or paramagnetic substances, holding them mechanically.
  • All poles and sidewalls are well-connected being made from a monolithic ferrous block, which adds stability to the structure.
  • the working face is entirely leak-proof and no liquid/coolant can seep in from the top working face.
  • FIG. 1 shows a longitudinal cross-sectional view of a work holding apparatus according to the invention
  • FIG. 2 gives a view of the electro permanent work holding apparatus according to the invention holding magnetically a ferromagnetic workpiece
  • FIG. 3 depicts a view of the electro permanent work holding apparatus according to the invention holding a workpiece with the help of mechanical clamps.
  • FIG. 1 an electromagnetic permanent magnetic apparatus according to the invention the shown. It comprises a work holding face 1 , a base plate is 2 , the electrical windings 3 , demarked magnetic poles 4 , a first set of permanent, but reversible magnets 6 , and a second set of permanent, non-reversible, magnets are designated by 5 .
  • the work holding face 1 also comprises slots 7 which may be shaped as tee-slots running across the length and/or width of the work holding apparatus, which are brought into play while dealing with a diamagnetic or paramagnetic job or workpiece.
  • FIG. 2 the electromagnetic permanent magnetic apparatus according to the invention is shown holding a ferrous job or workpiece 8 magnetically, obviating the need to deploy additional mechanical holding means.
  • FIG. 3 the electromagnetic permanent magnetic apparatus according to the invention is shown holding a diamagnetic or paramagnetic job or workpiece 8 with the help of mechanical clamps 9 .
  • the magnetic bed of this invention could also be used as a machine bed, thereby enhancing the life of the original machine bed.
  • the working face of the holding apparatus is obtained from a monolithic block of ferromagnetic material, wherein the poles are demarked by making slots in the said block, obviating the need to use filler material(s).
  • a magnetic work holding apparatus which is a variant of the electro permanent magnetic work holding apparatus as described and illustrated hereinabove, equipped with a monolithic working face of a ferromagnetic material capable of being used for anchoring/hoisting of ferrous metal parts, components or whole machine.
  • the said variant electro permanent magnetic work holder suitable for holding ferromagnetic objects, having at least two poles, each one of which has a non-reversible permanent magnet and a reversible permanent magnet surrounded by an electrical winding which is used for effecting reversal of the magnetic poles of the reversible magnet.
  • This apparatus is obtained from two pieces of ferromagnetic material, one serving as the top working face and the other as base plate, wherein poles are demarcated in the top working face of the work holder by making recesses in the monolithic block and cavities are made on the opposite side of the poles for locating/positioning reversible and non-reversible permanent magnets, the former being placed on the backside of the pole surrounded by an electrical winding and the latter are placed on the surface nearest the top working face.
  • the top working face provides a stable and leak-proof working surface.
  • a second monolithic ferrous surface may be introduced in such a manner that it holds the reversible permanent magnets between the poles and base plate in a sandwiched manner and on the base plate pockets are made for housing the non-reversible permanent magnets directly below the demarcated poles.
  • the monolithic ferrous working face 1 has two sets of permanent magnets assembled beneath it.
  • the magnetic orientation of one of the sets, called reversible permanent magnets 6 is reversed electrically using the electrical windings 3 around it, depending upon whether to clamp the ferromagnetic job (called ON condition) or to release the ferromagnetic job (called OFF condition).
  • the second set of permanent magnets called non-reversible permanent magnets 5 which are not reversed, are placed between the poles 4 .
  • the base plate 2 has a plurality of recesses which house the reversible permanent magnets 6 in such a way that they are sandwiched between the working face 1 and the bottom plate 2 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Jigs For Machine Tools (AREA)
US11/977,311 2005-04-25 2007-10-24 Magnetic holding apparatus for holding workpieces Abandoned US20080290973A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/692,395 US7999645B2 (en) 2005-04-25 2010-01-22 Magnetic holding apparatus for holding workpieces

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
IN345/KOL/2005 2005-04-25
IN345KO2005 2005-04-25
IN883/KOL2005 2005-09-26
IN883KO2005 2005-09-26
PCT/IN2006/000118 WO2007119245A1 (fr) 2005-04-25 2006-04-06 Dispositif de maintien de pièce magnétique et mécanique avec face de travail monolithique

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2006/000118 Continuation WO2007119245A1 (fr) 2005-04-25 2006-04-06 Dispositif de maintien de pièce magnétique et mécanique avec face de travail monolithique

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/692,395 Continuation US7999645B2 (en) 2005-04-25 2010-01-22 Magnetic holding apparatus for holding workpieces

Publications (1)

Publication Number Publication Date
US20080290973A1 true US20080290973A1 (en) 2008-11-27

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
US11/977,311 Abandoned US20080290973A1 (en) 2005-04-25 2007-10-24 Magnetic holding apparatus for holding workpieces
US12/692,395 Expired - Fee Related US7999645B2 (en) 2005-04-25 2010-01-22 Magnetic holding apparatus for holding workpieces

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/692,395 Expired - Fee Related US7999645B2 (en) 2005-04-25 2010-01-22 Magnetic holding apparatus for holding workpieces

Country Status (3)

Country Link
US (2) US20080290973A1 (fr)
EP (1) EP1874504B1 (fr)
WO (1) WO2007119245A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100301532A1 (en) * 2007-09-14 2010-12-02 Politecnico Di Milano One-piece multipole plate for a magnetic holding apparatus, process for making such plate and magnetic apparatus using such plate
US20100308519A1 (en) * 2007-11-30 2010-12-09 Uttam Sarda Electro permanent magnetic apparatus with dual working face
JP2011519733A (ja) * 2008-04-22 2011-07-14 テクノマグネーテ ソチエタ ペル アツィオーニ 一体型磁気装置および該一体型磁気装置の製造方法
JP2014530116A (ja) * 2011-09-19 2014-11-17 テクノマグネーテ ソチエタペル アツィオーニＴＥＣＮＯＭＡＧＮＥＴＥ Ｓ．ｐ．Ａ． 強磁性ワークをクランプするモジュール式磁気装置
US20160207176A1 (en) * 2015-01-21 2016-07-21 Tae Kwang Choi Magnetic substance holding device
CN111417490A (zh) * 2017-11-29 2020-07-14 麦格纳国际公司 用于焊接操作的固定装置组件
JP2020529741A (ja) * 2017-08-04 2020-10-08 株洲悍威磁電科技有限公司Ｈｖｒ Ｍａｇｎｅｔｉｃｓ Ｃｏ．， Ｌｔｄ 電気永久磁石チャック

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ATE553879T1 (de) * 2008-04-22 2012-05-15 Tecnomagnete Spa Selbstverankernde magnetvorrichtung und steuereinheit zur steuerung der magnetvorrichtung
US8490955B2 (en) 2008-09-19 2013-07-23 The Boeing Company Electromagnetic clamping device
US8864120B2 (en) * 2009-07-24 2014-10-21 The Boeing Company Electromagnetic clamping system for manufacturing large structures
CN102371496B (zh) * 2010-08-26 2014-06-18 中国北车集团大同电力机车有限责任公司 导磁块、包括该导磁块的电磁吸力平台和铣床
EP2497599B1 (fr) * 2011-03-07 2013-01-23 C.R.F. Società Consortile per Azioni Dispositif magnétique destiné à saisir et serrer une pièce sur une machine de traitement ou sur une ligne de fabrication
ES2395003B2 (es) * 2011-06-16 2013-07-22 Eliot System, S.L. Dispositivo mejorado para rueda de oruga con banda magnética
CN102267057B (zh) * 2011-06-29 2013-05-29 南京航空航天大学 非磁性构件制孔的主动夹紧机构
FR2983751B1 (fr) * 2011-12-08 2014-08-08 Gaztransp Et Technigaz Construction d'une membrane etanche a partir de plaques metalliques
US9620953B2 (en) 2013-03-25 2017-04-11 Wen Technology, Inc. Methods providing control for electro-permanent magnetic devices and related electro-permanent magnetic devices and controllers
EP3613526B1 (fr) * 2013-04-19 2023-12-13 Milwaukee Electric Tool Corporation Perceuse à colonne magnétique
EP2926944B1 (fr) 2014-03-31 2019-02-06 SOPH International Limited Mandrin magnétique et procédé de fabrication d'un tel mandrin
TWI664893B (zh) 2015-07-13 2019-07-01 英屬開曼群島商鴻騰精密科技股份有限公司 電子裝置
TW201703617A (zh) 2015-07-13 2017-01-16 鴻騰精密科技股份有限公司 電子裝置
TW201707286A (zh) 2015-08-10 2017-02-16 鴻騰精密科技股份有限公司 電連接器
CN106450846B (zh) * 2015-08-12 2019-05-31 富士康(昆山)电脑接插件有限公司 电连接器
TW201709794A (zh) 2015-08-17 2017-03-01 鴻騰精密科技股份有限公司 電子裝置
US20170227617A1 (en) * 2016-02-09 2017-08-10 Weinberg Medical Physics, Inc. Method and apparatus for manipulating electropermanent magnets for magnetic resonance imaging and image guided therapy
US10734149B2 (en) 2016-03-23 2020-08-04 Wen Technology Inc. Electro-permanent magnetic devices including unbalanced switching and permanent magnets and related methods and controllers
CN205959708U (zh) * 2016-08-15 2017-02-15 布里斯克磁业(上海)有限公司 一种漏磁式导磁板和漏磁式磁性吸持装置
KR101750376B1 (ko) * 2016-12-16 2017-06-23 화천기공 주식회사 전자석 척 장착구조
US10512998B1 (en) * 2018-05-15 2019-12-24 James R. Merritt Machining system and method
CN109332836A (zh) * 2018-12-18 2019-02-15 东莞市嘉达磁电制品有限公司 线切割用磁吸式装载治具组件
CN114084675B (zh) * 2021-11-25 2024-02-06 湖南航天磁电有限责任公司 一种用于硬质合金的电磁吸附装置

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US687931A (en) * 1900-08-06 1901-12-03 Linotype Co Magnetic holding-table for metal-working machines.
US2676413A (en) * 1943-11-09 1954-04-27 Wharton William Design and construction of jigs and fixtures
US3967816A (en) * 1974-02-21 1976-07-06 Mauser-Schaerer Gmbh Fixture block serving as a manufacturing accessory
US4075589A (en) * 1975-12-04 1978-02-21 Philibert Maurice Braillon Magnetic plate comprising permanent magnets and electropermanent magnets
US4507635A (en) * 1982-11-16 1985-03-26 Tecnomagnetica Di Cardone, Grandini, Zaramella & C.S.A.S. Magnetic anchoring apparatus with quadrangular pole arrangement
US4497412A (en) * 1984-03-12 1985-02-05 Labelle Edward J Implement holder
US4684112A (en) * 1985-01-15 1987-08-04 Chernikov Jury L Device for magnetic holding of workpieces
US4691183A (en) * 1985-02-13 1987-09-01 Odesskoe Spetsialnoe Konstruktorskoe Bjuro Spetsialnykh Stankov Device for magnetically holding workpieces
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US4837540A (en) * 1987-10-12 1989-06-06 Tecnomagnete S.P.A. Magnetic work-holder
US5931726A (en) * 1997-12-19 1999-08-03 Peters; Jeffrey T. Adjustment plate
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100301532A1 (en) * 2007-09-14 2010-12-02 Politecnico Di Milano One-piece multipole plate for a magnetic holding apparatus, process for making such plate and magnetic apparatus using such plate
US8292276B2 (en) * 2007-09-14 2012-10-23 Tecnomagnete S.P.A. One-piece multipole plate for a magnetic holding apparatus, process for making such plate and magnetic apparatus using such plate
US8636272B2 (en) 2007-09-14 2014-01-28 Tecnomagnete S.P.A. One-piece multipole plate for a magnetic holding apparatus, process for making such plate and magnetic apparatus using such plate
US20100308519A1 (en) * 2007-11-30 2010-12-09 Uttam Sarda Electro permanent magnetic apparatus with dual working face
JP2011519733A (ja) * 2008-04-22 2011-07-14 テクノマグネーテ ソチエタ ペル アツィオーニ 一体型磁気装置および該一体型磁気装置の製造方法
KR101482618B1 (ko) * 2008-04-22 2015-01-14 테크노마그네트 쏘시에떼 퍼 아찌오니 일체형 자기 장치 및 일체형 자기장치의 제조 방법
JP2014530116A (ja) * 2011-09-19 2014-11-17 テクノマグネーテ ソチエタペル アツィオーニＴＥＣＮＯＭＡＧＮＥＴＥ Ｓ．ｐ．Ａ． 強磁性ワークをクランプするモジュール式磁気装置
US20160207176A1 (en) * 2015-01-21 2016-07-21 Tae Kwang Choi Magnetic substance holding device
US9969061B2 (en) * 2015-01-21 2018-05-15 Tae Kwang Choi Magnetic substance holding device
JP2020529741A (ja) * 2017-08-04 2020-10-08 株洲悍威磁電科技有限公司Ｈｖｒ Ｍａｇｎｅｔｉｃｓ Ｃｏ．， Ｌｔｄ 電気永久磁石チャック
US11728079B2 (en) 2017-08-04 2023-08-15 Hvr Magnetics Co., Ltd Electric permanent magnet chuck
CN111417490A (zh) * 2017-11-29 2020-07-14 麦格纳国际公司 用于焊接操作的固定装置组件

Also Published As

Publication number Publication date
EP1874504A4 (fr) 2010-09-15
EP1874504B1 (fr) 2012-09-12
EP1874504A1 (fr) 2008-01-09
WO2007119245A1 (fr) 2007-10-25
US20100117773A1 (en) 2010-05-13
US7999645B2 (en) 2011-08-16

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