EP0212717A2 - Procédé et dispositif pour enfoncer des canaux à faible section dans la surface d'une pièce - Google Patents

Procédé et dispositif pour enfoncer des canaux à faible section dans la surface d'une pièce Download PDF

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Publication number
EP0212717A2
EP0212717A2 EP86201300A EP86201300A EP0212717A2 EP 0212717 A2 EP0212717 A2 EP 0212717A2 EP 86201300 A EP86201300 A EP 86201300A EP 86201300 A EP86201300 A EP 86201300A EP 0212717 A2 EP0212717 A2 EP 0212717A2
Authority
EP
European Patent Office
Prior art keywords
wire
shaped element
workpiece
channel
stamp
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.)
Withdrawn
Application number
EP86201300A
Other languages
German (de)
English (en)
Other versions
EP0212717A3 (fr
Inventor
Michael Döring
Peter Wohlenberg
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Corporate Intellectual Property GmbH
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Corporate Intellectual Property GmbH, Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Corporate Intellectual Property GmbH
Publication of EP0212717A2 publication Critical patent/EP0212717A2/fr
Publication of EP0212717A3 publication Critical patent/EP0212717A3/fr
Withdrawn legal-status Critical Current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
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/02—Forming single grooves in sheet metal or tubular or hollow articles by pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14362—Assembling elements of heads

Definitions

  • the invention relates to a method for embossing channels with a cross section of less than 1 mm2 in the surface of a workpiece.
  • Channels with such small cross-sections are required in particular for ink jet print heads that work according to the drop-on-demand method.
  • Small droplets are thrown out of nozzles by a pressure surge in a liquid system.
  • considerably more energy is put into the liquid than is required to generate a drop.
  • the remaining energy must be removed from the liquid, which is generally done by damping the liquid after-oscillation in a suitable damping capillary.
  • the cross section of the damping capillaries must be matched very precisely to the viscosity of the ink and the frequency of the liquid oscillation. With the viscosities and oscillation frequencies that occur in ink jet print heads, the necessary throttle cross sections are between 1000 and 3000 ⁇ m2, which must be maintained to approx. ⁇ 100 ⁇ m2.
  • channels have been embossed into a stainless steel plate by precision embossing with a complex tool for the formation of damping capillaries.
  • a stamp manufactured with the highest precision was pressed into the steel plate, the embossing depth being very accurate due to possible damage and wear of the embossing tool complex measuring equipment had to be checked.
  • the alignment of the workpiece and the stamp must also be carried out very precisely in order to guarantee a throttle channel depth that is uniform over the entire length. Tool and manufacturing process were complex. The tool life was short.
  • the invention has for its object to design the method of the type mentioned in such a way that with simple means and without significant control effort, the impression of channels with a small cross section is possible with great accuracy.
  • the solution is achieved in that a wire-shaped element is placed between the surfaces of the workpiece and a flat stamp in the position of the channel to be formed, and that the stamp is then pressed until it rests against the surface of the workpiece.
  • a simple, commercially available wire that can be manufactured with high accuracy is used, which of course has to be harder than the workpiece (e.g. tungsten wire).
  • This wire is placed on the workpiece at the point where the channel is to be embossed. The wire is pressed into the workpiece with a flat carbide plate. If the hard metal plate rests on the workpiece, the wire cannot be stamped deeper, so that the stamping process is finished.
  • Wire-shaped elements with a circular cross-section can be produced particularly easily and precisely.
  • the diameter of the wire is advantageous shaped element smaller than the width of the channel.
  • the wire is in any case elastically deformed, so that the shape of the throttle channel obtained on the bottom has an elliptical shape. This is not critical for the function, but has the advantage that the wire springs back somewhat when the hard metal plate is relieved and can be removed very easily.
  • Different channel cross sections can be produced when using the same wire-shaped element in each case by placing a soft, deformable film between the stamp and the wire-shaped element.
  • the film is preferably made of plastic.
  • the wire is pressed into the film, which plastically deforms and destroys it.
  • Plastic films of different thicknesses can be manufactured very precisely and are commercially available.
  • a particularly useful device for carrying out the method according to the invention is characterized in that it has a supply roll for an unused wire-shaped element and a take-up roll for used sections of the wire-shaped element, which are arranged opposite one another in the channel direction on both sides of the stamp, and in that the take-up roll by means of such a device
  • Controlled drive device is rotatable step by step, that a length section of the wire-shaped element is wound by each stamping process, which is longer than the length used for the embossing process.
  • the feeding of the interposed foils can be effected in an analogous manner.
  • a full-surface contact of the stamp on the surface of the workpiece is guaranteed without complex alignment if the stamp is guided to a certain extent on all sides over a spherical surface.
  • the method according to the invention offers the possibility of producing not only straight but also curved channel guides, which was previously not possible with simple stamps. Variations in the channel geometry are possible in the simplest way without having to rebuild the tool.
  • FIGS. 1 to 4 only the end regions of a stamp 1 made of hard metal are shown which have a smooth and preferably polished surface. 2 in each case denotes the area of a workpiece in which a channel 3 or 4 is to be impressed.
  • a wire 5 is placed between the punch 1 and the workpiece 2 immediately before embossing.
  • the material and the hardness of the wire 5 are to be adapted to the material of the workpiece 2.
  • Tungsten wires have proven their worth when stamping channels in steel.
  • the elliptically deformed wire 5 ' is sunk into the material of the workpiece 2, as a result of which the channel 3 is formed.
  • the circular wire 5 is deformed into the elliptical cross-sectional shape elastically and usually also plastically.
  • the elastic deformation gives the advantageous effect that the cross-sectional shape deforms back to a certain extent after the stamp 1 has been lifted off, so that the wire used can be easily removed from the channel.
  • plastic deformation since in most cases plastic deformation also occurs, a wire section can only be used once.
  • the width of the channel 3 will generally be greater than the diameter of the wire 5.
  • a plastic film 6 is additionally placed between the surface of the stamp 1 and the wire 5.
  • the thin wire 5 is through the relatively soft film 6 to the surface of the Stamp 1 pressed.
  • a distance corresponding to the thickness of the film remains between the punch 1 and the workpiece 2 in the final state according to FIG. By exactly this distance, the depth of the channel 4 according to FIG. 4 is less than that of the channel 3 according to FIG. 2.
  • the depth of the channel 4 can thus be varied specifically for a given diameter of the wire 5.
  • the intermediate layer of a film 6 has the advantage that the contact pressure of the wire 5 on the surface of the stamp 1 is distributed over a larger area. Because of the reduced surface pressure, the service life of the stamp 1 is therefore significantly increased.
  • the sum of the depth t of the channel 4 and the thickness d of the film 5 is constant. It should be noted that the width b of the channel 4 also becomes smaller in the case of thicker foils (in the example at d 8 ⁇ m). Since it cannot theoretically be determined with sufficient accuracy how large the channel cross cut depending on the diameter of the wire 5 and the thickness d of the film 6, optimal values must be determined by experiment.
  • the surface of the stamp acting on the wire 5 was made flat and with a smoothed surface. It has been found that no guide grooves for the wire 5 may be incorporated into the surface of the stamp, because then edges can be pushed up on the side surfaces of the channels 3 and 4, respectively, over the surface of the workpiece. Then, for example, the smooth contact of a cover plate that closes the open sides of the channels is made more difficult.
  • Wire sections can be interposed by hand for trials and for machining a few workpieces.
  • a tool according to an arrangement according to FIG. 5 has proven to be advantageous, in which unprocessed sections of the wire 5 and the film 6 are automatically fed from supply rolls.
  • the stamp 1 is guided in the guide plate 7 with play and is actuated by the plunger 8 via its spherical surface 9, so that the surface of the stamp 1 acting on the wire can freely adapt to a certain extent different positions of the workpiece surface.
  • the workpiece 2 is between the cavities 10 and 11 to the dashed Line 12 to emboss a connection channel which, in the case of a damping channel of inkjet print heads, should have a cross section of approximately 1000 to 3000 ⁇ m.
  • the wire 5 is automatically drawn off from a supply roll 13 by the take-up roll 14 after each stamping operation to such an extent that a new, unused section of the wire 5 is located below the stamp. In a similar manner, but in the exemplary embodiment in FIG. 5 perpendicular to the withdrawal direction of the wire 5, an unused section of the film 6 is drawn between the punch 1 and the wire 5.
  • channels can be successively embossed into a series of workpieces of the same type. It is also possible to emboss a large number of identical channels in a single workpiece by changing the relative position of the workpiece to the embossing tool accordingly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
EP86201300A 1985-08-09 1986-07-23 Procédé et dispositif pour enfoncer des canaux à faible section dans la surface d'une pièce Withdrawn EP0212717A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3528642 1985-08-09
DE19853528642 DE3528642A1 (de) 1985-08-09 1985-08-09 Verfahren und anordnung zum einpraegen von kanaelen mit geringem querschnitt in die oberflaeche eines werkstuecks

Publications (2)

Publication Number Publication Date
EP0212717A2 true EP0212717A2 (fr) 1987-03-04
EP0212717A3 EP0212717A3 (fr) 1987-09-23

Family

ID=6278140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86201300A Withdrawn EP0212717A3 (fr) 1985-08-09 1986-07-23 Procédé et dispositif pour enfoncer des canaux à faible section dans la surface d'une pièce

Country Status (4)

Country Link
US (1) US4735077A (fr)
EP (1) EP0212717A3 (fr)
JP (1) JPS6234627A (fr)
DE (1) DE3528642A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2507408Y2 (ja) * 1988-11-18 1996-08-14 三洋電機株式会社 段ボ―ル梱包構造
US20060277965A1 (en) * 2000-08-17 2006-12-14 Industrial Origami, Llc Three-dimensional structure formed with precision fold technology and method of forming same
BRPI0609143A2 (pt) 2005-03-17 2011-09-13 Ind Origami Llc folha de material para a formação de uma estrutura estrutural tridimensional, viga oca e armação de exoesqueleto
TW200833434A (en) * 2006-09-04 2008-08-16 Ind Origami Inc Apparatus for forming large-radii curved surfaces and small-radii creases in sheet material
EP2079554A2 (fr) 2006-10-26 2009-07-22 Industrial Origami, Inc. Procédé de transformation de matériau en feuille à deux dimensions en structure à trois dimensions
EP2118553A4 (fr) * 2007-02-09 2014-04-16 Ind Origami Inc Structure tridimensionnelle portant une charge
CA2715659A1 (fr) * 2008-02-16 2009-08-20 Industrial Origami, Inc. Systeme de pliage par rouleau de faible force et procedes correspondants
WO2010093710A1 (fr) * 2009-02-10 2010-08-19 Industrial Origami, Inc. Tôle de matériau à structure d'aide au cintrage, et procédé correspondant
US8936164B2 (en) * 2012-07-06 2015-01-20 Industrial Origami, Inc. Solar panel rack

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2528540A (en) * 1946-02-25 1950-11-07 Edgar C V Oldofredi Method of ornamenting sheet metal
US2765682A (en) * 1951-12-06 1956-10-09 Grote Mfg Co Inc Improved method of making embossing rolls
US4012935A (en) * 1973-06-18 1977-03-22 Continental Can Company, Inc. Score and tool for forming the score
JPS6095277A (ja) * 1983-10-27 1985-05-28 Fuji Koki Seisakusho:Kk 弁座切溝加工方法
US4612765A (en) * 1985-06-27 1986-09-23 Caterpillar Inc. Anvil apparatus for a press

Also Published As

Publication number Publication date
US4735077A (en) 1988-04-05
DE3528642A1 (de) 1987-02-12
JPS6234627A (ja) 1987-02-14
EP0212717A3 (fr) 1987-09-23

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Inventor name: DOERING, MICHAEL