WO2000067953A1 - Magnetic holding device - Google Patents

Magnetic holding device Download PDF

Info

Publication number
WO2000067953A1
WO2000067953A1 PCT/AU2000/000428 AU0000428W WO0067953A1 WO 2000067953 A1 WO2000067953 A1 WO 2000067953A1 AU 0000428 W AU0000428 W AU 0000428W WO 0067953 A1 WO0067953 A1 WO 0067953A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnets
magnetic
holding device
nickel
layer
Prior art date
Application number
PCT/AU2000/000428
Other languages
French (fr)
Inventor
Alan John Fawcett
Original Assignee
Alan John Fawcett
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 Alan John Fawcett filed Critical Alan John Fawcett
Priority to AU42772/00A priority Critical patent/AU4277200A/en
Publication of WO2000067953A1 publication Critical patent/WO2000067953A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0231—Magnetic circuits with PM for power or force generation
    • 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
    • B23Q3/1546—Stationary devices using permanent magnets
    • 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
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
    • B44B5/02—Dies; Accessories
    • B44B5/022—Devices for holding or supporting work

Definitions

  • the present invention relates to magnetic holding devices such as that disclosed in Australian Patent Application 17618/95 employed in the field of graphic arts, such as foil stamping.
  • the above-mentioned Australian patent application discloses a holding device which secures a steel back polymer plate to a heating element, for the purposes of transferring thin metal foil or leaf to paper, card, plastics material or similar media.
  • Use of the above-mentioned holding device demonstrated a number of shortcomings including the magnets employed progressively loosing their magnetic strength.
  • a further problem was securing the magnets to the body of the device.
  • Various methods employed were found to be unsuitable when subjected to continuous heat and pressure.
  • a more significant problem was oxidation of the surface of the device after machining. This oxidation led to the surface of the magnets being gradually eroded until they were below the surface of the device. This resulted in uneven surface dimensions which gave poor stamping results.
  • a magnetic holding device to secure a steel backed polymer plate to a foil stamping heating element, said device having: a body having a body surface to engage the plate; a plurality of magnets embedded in the body so as to each have a magnetic surface substantially co-planar with respect to said body surface, the magnets being provided to urge the plate into contact with the body and magnetic surface; and a layer of nickel covering said body surface and the magnetic surface.
  • said body is generally planar and said body surface is generally planar.
  • said body is generally arcuate and said body surface is generally arcuate.
  • the body is circular in transverse cross- section and said body surface is circular.
  • the layer of nickel is between 0.1 millimetres and 0.025 millimetres.
  • the magnets are secured within the body by Loctite 620 (registered trade mark).
  • the magnets are Samarium Cobalt Disc Magnets.
  • a method to produce the above-described attachment device including the steps of: providing said body with apertures to receive said magnets; placing an adhesive in the apertures; placing the magnets in the apertures so as to be secured to the body with the aid of the adhesive; machining the body and magnets so as to provide said body surface and magnet surfaces; nickel plating the body and magnets so that the layer of nickel covers said body and magnetic surfaces.
  • the machining step is a grinding or milling process.
  • the body provided is heat annealed to relieve surface tension prior to machining.
  • the body is engraver's brass.
  • the body is milled so as to provide a flat surface to be drilled to form said apertures.
  • the nickel layer is 0.05 millimetres in thickness prior to machining.
  • the nickel layer is 0.1 to 0.025 mm in thickness after machining.
  • a sealant is applied to the magnetic surface after machining, which sealant is removed before the nickel plating.
  • FIG. 1 there is schematically depicted in sectioned side elevation a portion of a magnetic holding device securing a steel backed photo polymer plate to a foil stamping heating element. More particularly, there is shown in the attached drawing a portion of a holding device 10, securing a steel back photo polymer plate 11 to a foil stamping heating element 12.
  • the device 10 has at spaced locations a plurality of magnets 13 embedded in the body 14.
  • the body 14 is formed of engraver's brass that when initially provided has been heat annealed to relieve surface tension.
  • the body 14 provided has its surface 15 milled to remove approximately .2 millimetres from both major surfaces. This leaves the body 12 with a depth of approximately 5.3 millimetres.
  • the body 14 is drilled to provide a pilot hole to facilitate the drilling of a blind hole to a depth of approximately 2.85 millimetres.
  • the blind holes receive the magnets 13.
  • the magnets 13 initially are approximately 3 millimetres thick and about 10 millimetres in diameter.
  • the magnets 13 are preferably Samarium Cobalt Disc magnets.
  • the layer 15 generally surrounds the magnets 15 so as to compensate for imperfections in the magnets 15 and formation of the blind holes within which they are located.
  • the body 14 and magnets 13 are then machined (preferably by grinding or milling) so as to provide the body 14 with a body surface 17 and each of the magnets 13 with a magnetic surface 18.
  • the surfaces 17 and 18 are therefore substantially coplanar and provide an attachment surface 16.
  • a sealant such as Rocol Moistureguard Spray Sealant is placed over the surfaces 18.
  • the body 14 and magnets 13 are also nickel plated so that a layer of nickel 20 overlays the surfaces 17 and 18, only after the sealant has been removed.
  • the Loctite is allowed to cure for approximately 12 hours prior to grinding or milling to provide the surfaces 17 and 18.
  • the milling or grinding is performed in two stages, one stage removing 0.15 millimetres to provide the surfaces 17 and 18 and the second stages removing .15 millimetres to provide the surface 21.
  • the thickness of the body 14 after grinding is approximately 5 millimetres
  • the thickness of the layer 20 (prior to machining) is approximately 0.075 millimetres.
  • the layer 20 is preferably applied after the surfaces 17 and 18 have been lightly sanded.
  • the external surface 22 of the layer 20 may also be lightly grounded in order to improve its smoothness.
  • the device 10, after final grinding will be about 5.05 millimetres thick.
  • the layer 20 has a thickness (after machining) of 0.1 millimetres to
  • Disc Magnets have a greater operating temperature (250°C to 350°C) which provides the magnets with a prolonged life.
  • the use of the above-mentioned Loctite also enables the device to stand up to continuous heat and pressure typical of the environment of the present invention. Still further, the engraver's brass has been found to be easier to machine while providing superior toughness and heat conductivity while also resisting corrosion.
  • Engraver's brass is 70/30 Arsenical Brass Alloy 259.
  • brass alloy 377 can be used.
  • the Samarium Cobalt magnets are sintered, with their composition being about
  • the above described embodiment may be modified by forming a "through hole” rather than drilling a blind hole within which the magnet 13 is located. Where a through hole is formed the aperture remote from the surface 17 could be closed by a plug (bath).
  • the body 14 is generally planar
  • the surfaces 17 and 18 are also flat.
  • the body 14 could be generally cylindrical so as to have a generally circular transverse cross- section. In such an instance, the surfaces 17 and 18 would be cylindrical.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

A magnetic holding device (10) to secure a steel back photo polymer plate (11) to a foil heat stamping element (12). The device (10) has at spaced locations a plurality of magnets (13) embedded in the body (14). The body (14) is formed of engravers brass and the magnets (13) are secured in apertures in the body by means of an adhesive.

Description

MAGNETIC HOLDING DEVICE
Technical Field
The present invention relates to magnetic holding devices such as that disclosed in Australian Patent Application 17618/95 employed in the field of graphic arts, such as foil stamping.
Background of the Invention
The above-mentioned Australian patent application discloses a holding device which secures a steel back polymer plate to a heating element, for the purposes of transferring thin metal foil or leaf to paper, card, plastics material or similar media. Use of the above-mentioned holding device demonstrated a number of shortcomings including the magnets employed progressively loosing their magnetic strength. A further problem was securing the magnets to the body of the device. Various methods employed were found to be unsuitable when subjected to continuous heat and pressure. A more significant problem was oxidation of the surface of the device after machining. This oxidation led to the surface of the magnets being gradually eroded until they were below the surface of the device. This resulted in uneven surface dimensions which gave poor stamping results.
Object of the Invention
It is the object of the present invention to overcome or substantially ameliorate at least one of the above disadvantages.
Summary of the Invention
There is disclosed herein a magnetic holding device to secure a steel backed polymer plate to a foil stamping heating element, said device having: a body having a body surface to engage the plate; a plurality of magnets embedded in the body so as to each have a magnetic surface substantially co-planar with respect to said body surface, the magnets being provided to urge the plate into contact with the body and magnetic surface; and a layer of nickel covering said body surface and the magnetic surface. Preferably, said body is generally planar and said body surface is generally planar. In an alternative arrangement said body is generally arcuate and said body surface is generally arcuate. In a specific form the body is circular in transverse cross- section and said body surface is circular.
Preferably the layer of nickel is between 0.1 millimetres and 0.025 millimetres. Preferably the magnets are secured within the body by Loctite 620 (registered trade mark).
Preferably the magnets are Samarium Cobalt Disc Magnets.
There is further disclosed herein a method to produce the above-described attachment device, said method including the steps of: providing said body with apertures to receive said magnets; placing an adhesive in the apertures; placing the magnets in the apertures so as to be secured to the body with the aid of the adhesive; machining the body and magnets so as to provide said body surface and magnet surfaces; nickel plating the body and magnets so that the layer of nickel covers said body and magnetic surfaces.
Preferably the machining step is a grinding or milling process.
Preferably the body provided is heat annealed to relieve surface tension prior to machining.
Preferably the body is engraver's brass.
Preferably the body is milled so as to provide a flat surface to be drilled to form said apertures.
Preferably the nickel layer is 0.05 millimetres in thickness prior to machining. Preferably the nickel layer is 0.1 to 0.025 mm in thickness after machining.
Preferably a sealant is applied to the magnetic surface after machining, which sealant is removed before the nickel plating.
Detailed Description of the Preferred Embodiment
In the accompanying drawing there is schematically depicted in sectioned side elevation a portion of a magnetic holding device securing a steel backed photo polymer plate to a foil stamping heating element. More particularly, there is shown in the attached drawing a portion of a holding device 10, securing a steel back photo polymer plate 11 to a foil stamping heating element 12. In that regard it must be appreciated that the device 10 has at spaced locations a plurality of magnets 13 embedded in the body 14. The body 14 is formed of engraver's brass that when initially provided has been heat annealed to relieve surface tension. The body 14 provided has its surface 15 milled to remove approximately .2 millimetres from both major surfaces. This leaves the body 12 with a depth of approximately 5.3 millimetres. The body 14 is drilled to provide a pilot hole to facilitate the drilling of a blind hole to a depth of approximately 2.85 millimetres. The blind holes receive the magnets 13. The magnets 13 initially are approximately 3 millimetres thick and about 10 millimetres in diameter. As mentioned previously, the magnets 13 are preferably Samarium Cobalt Disc magnets. However, to ensure securing of the magnets 13 within the body 14, there is provided in each blind hole a layer of adhesive (Loctite 620 (registered trade mark)) 15. The layer 15 generally surrounds the magnets 15 so as to compensate for imperfections in the magnets 15 and formation of the blind holes within which they are located. The body 14 and magnets 13 are then machined (preferably by grinding or milling) so as to provide the body 14 with a body surface 17 and each of the magnets 13 with a magnetic surface 18. The surfaces 17 and 18 are therefore substantially coplanar and provide an attachment surface 16. After machining, a sealant such as Rocol Moistureguard Spray Sealant is placed over the surfaces 18. The body 14 and magnets 13 are also nickel plated so that a layer of nickel 20 overlays the surfaces 17 and 18, only after the sealant has been removed.
Preferably the Loctite is allowed to cure for approximately 12 hours prior to grinding or milling to provide the surfaces 17 and 18. Preferably the milling or grinding is performed in two stages, one stage removing 0.15 millimetres to provide the surfaces 17 and 18 and the second stages removing .15 millimetres to provide the surface 21. The thickness of the body 14 after grinding is approximately 5 millimetres, the thickness of the layer 20 (prior to machining) is approximately 0.075 millimetres. The layer 20 is preferably applied after the surfaces 17 and 18 have been lightly sanded. Finally, the external surface 22 of the layer 20 may also be lightly grounded in order to improve its smoothness. The device 10, after final grinding will be about 5.05 millimetres thick.
Preferably the layer 20 has a thickness (after machining) of 0.1 millimetres to
0.025 millimetres, most preferably about 0.025 millimetres. The above-described preferred embodiment of the present invention exhibits a number of advantages including greater cycle life. Still further, the Samarium Cobalt
Disc Magnets have a greater operating temperature (250°C to 350°C) which provides the magnets with a prolonged life. The use of the above-mentioned Loctite also enables the device to stand up to continuous heat and pressure typical of the environment of the present invention. Still further, the engraver's brass has been found to be easier to machine while providing superior toughness and heat conductivity while also resisting corrosion.
Engraver's brass is 70/30 Arsenical Brass Alloy 259. As an alternative brass alloy 377 can be used. The Samarium Cobalt magnets are sintered, with their composition being about
35 % Samarium, 60% Cobalt, the balance being Fe and Cu.
It should further be appreciated that the above preferred embodiment is also useable with copper and brass steel backed plates and steel plates.
The above described embodiment may be modified by forming a "through hole" rather than drilling a blind hole within which the magnet 13 is located. Where a through hole is formed the aperture remote from the surface 17 could be closed by a plug (bath).
In respect of the above referred embodiment, the body 14 is generally planar
(flat). Accordingly, the surfaces 17 and 18 are also flat. In an alternative arrangement the body 14 could be generally cylindrical so as to have a generally circular transverse cross- section. In such an instance, the surfaces 17 and 18 would be cylindrical.

Claims

The claims defining the invention are as follows:-
1. A magnetic holding device to secure a steel backed polymer plate to a foil stamping heating element, said device having: a body having a body surface to engage the plate; a plurality of magnets embedded in the body so as to each have a magnetic surface substantially co-planar with respect to said body surface, the magnets being provided to urge the plate into contact with the body and magnetic surface; and a layer of nickel covering said body surface and the magnetic surface.
2. The magnetic holding device of claim 1, wherein said body is generally planar and said body surface is also generally planar.
3. The magnetic holding device of claim 1, wherein said body is generally circular in transverse cross-section so that said body surface is generally cylindrical.
4. The device of claim 1, 2 or 3, wherein the layer of nickel is between 0.1 mm and 0.025 mm.
5. A method to produce the device of any one of claims 1 to 4, said method including the steps of: providing said body with apertures to receive said magnets; placing an adhesive in the apertures; placing the magnets in the apertures so as to be secured to the body with the aid of an adhesive; machining the body of the magnets so as to provide said body surface and magnetic surface; nickel plating the body and magnets so that the layer of nickel covers said body and magnetic surfaces.
6. The method of claim 5, wherein the machining step is a grinding or milling process.
7. The method of claim 5, wherein the body provided is heat annealed to relieve surface tension prior to machining.
PCT/AU2000/000428 1999-05-11 2000-05-11 Magnetic holding device WO2000067953A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU42772/00A AU4277200A (en) 1999-05-11 2000-05-11 Magnetic holding device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPQ0291A AUPQ029199A0 (en) 1999-05-11 1999-05-11 Magnetic holding device
AUPQ0291 1999-05-11

Publications (1)

Publication Number Publication Date
WO2000067953A1 true WO2000067953A1 (en) 2000-11-16

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ID=3814498

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2000/000428 WO2000067953A1 (en) 1999-05-11 2000-05-11 Magnetic holding device

Country Status (2)

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AU (1) AUPQ029199A0 (en)
WO (1) WO2000067953A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002081221A1 (en) * 2001-04-05 2002-10-17 Robert Beson Magnetic holding device
WO2002085574A1 (en) * 2001-04-20 2002-10-31 Fawcett, Alan, John Magnetic holding device
WO2002086625A1 (en) * 2001-04-20 2002-10-31 Fawcett, Alan, John Method and apparatus for the hardening of photopolymer plates
AU2002247560B2 (en) * 2001-04-20 2006-12-21 Thermo Magnetic Systems (Australia) Pty Limited Magnetic holding device
WO2007045037A1 (en) * 2005-10-21 2007-04-26 Watermarx Technology Pty Limited Apparatus and method for die mounting
CN102601654A (en) * 2012-03-28 2012-07-25 昆山宝锦激光拼焊有限公司 Tailored blank laser welding device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1360953A (en) * 1972-06-23 1974-07-24 Cardone M Grandini A Magnetic anchoring device for use in the graphic arts
GB1512315A (en) * 1975-04-19 1978-06-01 Baermann M Switchable permanent magnetic holding devices
US4777463A (en) * 1987-09-25 1988-10-11 Dana Corporation Magnetic fixture assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1360953A (en) * 1972-06-23 1974-07-24 Cardone M Grandini A Magnetic anchoring device for use in the graphic arts
GB1512315A (en) * 1975-04-19 1978-06-01 Baermann M Switchable permanent magnetic holding devices
US4777463A (en) * 1987-09-25 1988-10-11 Dana Corporation Magnetic fixture assembly

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002081221A1 (en) * 2001-04-05 2002-10-17 Robert Beson Magnetic holding device
WO2002085574A1 (en) * 2001-04-20 2002-10-31 Fawcett, Alan, John Magnetic holding device
WO2002086625A1 (en) * 2001-04-20 2002-10-31 Fawcett, Alan, John Method and apparatus for the hardening of photopolymer plates
AU2002247560B2 (en) * 2001-04-20 2006-12-21 Thermo Magnetic Systems (Australia) Pty Limited Magnetic holding device
WO2007045037A1 (en) * 2005-10-21 2007-04-26 Watermarx Technology Pty Limited Apparatus and method for die mounting
CN102601654A (en) * 2012-03-28 2012-07-25 昆山宝锦激光拼焊有限公司 Tailored blank laser welding device

Also Published As

Publication number Publication date
AUPQ029199A0 (en) 1999-06-03

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