EP1362934B1 - Élément de retenue pour au moins une pièce - Google Patents

Élément de retenue pour au moins une pièce Download PDF

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Publication number
EP1362934B1
EP1362934B1 EP03008385A EP03008385A EP1362934B1 EP 1362934 B1 EP1362934 B1 EP 1362934B1 EP 03008385 A EP03008385 A EP 03008385A EP 03008385 A EP03008385 A EP 03008385A EP 1362934 B1 EP1362934 B1 EP 1362934B1
Authority
EP
European Patent Office
Prior art keywords
workpiece
fixing device
sealing elements
workpieces
surface area
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.)
Expired - Lifetime
Application number
EP03008385A
Other languages
German (de)
English (en)
Other versions
EP1362934A1 (fr
Inventor
Michael Hans
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.)
Oerlikon Surface Solutions AG Pfaeffikon
Original Assignee
Oerlikon Trading AG Truebbach
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 Oerlikon Trading AG Truebbach filed Critical Oerlikon Trading AG Truebbach
Priority claimed from EP98913496A external-priority patent/EP1080254B1/fr
Publication of EP1362934A1 publication Critical patent/EP1362934A1/fr
Application granted granted Critical
Publication of EP1362934B1 publication Critical patent/EP1362934B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F5/00—Electrolytic stripping of metallic layers or coatings

Definitions

  • the present invention relates to a holder according to the preamble of claim 1.
  • hard metal workpieces such as the life and / or efficiency of tools, in particular indexable inserts, drills, milling cutters, forming tools, stamping tools
  • a hard material layer such as titanium nitride or titanium carbonitride to coat.
  • vacuum coating methods are preferably used. Since carbide workpieces, especially in complex forming, for example, according to the above-mentioned tools, are expensive, it is attempted to save the workpiece, if it is mis-coated, or in particular, if the workpiece has been worn through use, shape-forming and re-coating , For this purpose, the affected workpieces must first be stripped.
  • the decoating conditions to be chosen are extremely critical. With incorrectly selected parameters, the layer is either not removed or the workpiece is irreparably damaged.
  • the state of the art is also the re-coating of tools without prior stripping.
  • the tools preferably shank tools made of hard metal, such as milling cutters, drills and hobs
  • This method has the disadvantage that only the cutting surfaces are free of layers by the regrinding, but the remaining areas of the tool remain coated.
  • the thickness of the hard material layer in the non-reground areas steadily increases.
  • the residual stresses in the urea layer increase, which leads to a reduction in the service life of the tool compared to a tool coated once only.
  • the residual stresses often lead to breakouts in the area of the transition from the coated to the uncoated part during regrinding of a coated tool and reduce the performance of the tool.
  • the holder is, as far as known today, for stripping all commonly used conductive hard coatings, such as hard coatings of nitrates, carbides, carbonitrides of metals or metal compounds, such as TiAlN, TiAlNC, WC, WCN, etc., but also of chromium-containing hard coatings . such as Cr, CrN, CrC, CrNC and combinations of these hard material layers or multilayer arrangements.
  • conductive hard coatings such as hard coatings of nitrates, carbides, carbonitrides of metals or metal compounds, such as TiAlN, TiAlNC, WC, WCN, etc.
  • chromium-containing hard coatings such as Cr, CrN, CrC, CrNC and combinations of these hard material layers or multilayer arrangements.
  • hob cutters an essential field of application of the present invention - it is impossible to immerse surface areas where the hard material layer is provided and which are to be stripped into the electrolyte simultaneously with surface areas where no hard material layer is provided.
  • hob cutters essentially constructed as a hollow cylinder, the inner surface is namely hard material layer, while the outer surface, the working surface, is coated hardstoff.
  • the holder according to the invention is used.
  • the sealing elements can be moved axially relative to each other to be clamped against the workpiece end faces.
  • an electrical contact arrangement is provided on the rod section provided between the sealing elements, the electrical supply to the contact arrangement more preferably being guided through the rod.
  • a tensioning body which is expandable or contractible by axial clamping radially with respect to the rod axis is provided on the rod portion located between the sealing members, on the periphery of which the contact elements are provided.
  • clamping members acting on the support in the direction of the support rod axis clamping members are provided for the clamping body to clamp the contact elements, by clamping the clamping body against the workpiece. This makes it possible, regardless of the diameter of the passage opening, to contact the workpiece optimally electrically in wide areas.
  • the holder according to the invention is particularly suitable for the workpiece holder when carrying out the method according to the invention mentioned in the introduction.
  • the inventive holder is suitable for workpieces with passage opening, in particular for hobbing.
  • a hob in the ammonium nitrate-acetic acid electrolyte was stripped within 3 minutes by applying a voltage of 15 V, an initial current of about 300 A and a passive current of about 50 A.
  • acetic acid-ammonium nitrate electrolytes used in the examples, it is also possible to use other electrolyte compositions which lead to the passivation of the cemented carbide.
  • a sodium nitrate-acetic acid, ceric ammonium nitrate-acetic acid, ceric ammonium nitrate nitric acid or ceric ammonium nitrate perchloric acid electrolyte can be used.
  • an embodiment of the inventive holder is shown in longitudinal section, schematically and simplified.
  • a clamping body 3 is screwed with threaded blind bore 5, terminal.
  • a counter-clamping block 7 is provided at the facing end faces 7 u and 3 o of the two parts 3 and 7 .
  • sealing elements 9 7 and 9 3 are provided at the facing end faces 7 u and 3 o of the two parts 3 and 7 .
  • the workpiece 11 is clamped between the end faces 7 u and 3 o of the parts 7 and 3.
  • the sealing elements for example O-rings 9 7 and 9 3 , sealingly abut end faces of the workpiece 11 in the region of the passage opening 11 o .
  • the electrical contacting of the workpiece 11 takes place on the inner surface 11 i via an electrical contact arrangement 13, wherein the electrical connection for a (not shown) power supply, as shown with E e , via the metallic tube 1 outside the electrolyte.
  • the electrical contact arrangement 13 can now be applied to the periphery of a resilient, for example rubber-elastic, actively tensioned clamping body 5, as shown in the embodiment according to the FIGURE , which rests on a shoulder 17 on the tube 1.
  • the clamping body 15 is fixedly connected to the body 7, both riding axially slidable on the tube 1.
  • the clamping body 15 can be axially actively more or less compressed, which As shown by the arrows r, leads to a more or less pronounced radial, outward-evasion and thus moving the contact assembly 13.
  • the electrical signal is carried out, as mentioned, via pipe 1, collar 17, bottom 15 u of the clamping body 15, at its periphery.
  • the workpiece 11 is mounted here as follows:
  • the clamping body 3 is removed from the tube 1. Thereafter, the workpiece is placed over the clamping body 15 in abutment with the seals 9 and 7 created by tightening the screw 19 and expanding the clamping body 15 in the context of its inherent elasticity an optimal electrical contact with the inner surface 11 i of the workpiece 11.
  • the body 3 is placed and clamped by screwing the workpiece 11 between the seals 9 7 and 9 3 , whereby both the inner surface 11 i of the workpiece against the environment U, in particular with the electrolyte B, is encapsulated and further optimal electrical contact Largely tolerance-independent is created.
  • the workpiece 11 is slipped over tube 1 with its fixed thereto provided resilient clamping body 15, after which the body 7 is placed from above the pipe 1, and there is the sealing clamping of the workpiece 11 between the sealing elements 9 7 and 9 respectively 3 by means of the actuator 19, for example an adjusting nut, which is screwed onto the external thread of the tube 1.
  • Those parts which come into contact with the electrolyte U for the workpiece outer surface 11 a ie in particular with the electrolyte bath B in preferred use in connection with the electrolytic Ent harshungshabilit according to the invention, are made of materials which neither affect the intended treatment nor by the intended treatment yourself be affected.
  • the clamping body 3 and at least the facing this games of the counter-clamping body 7, preferably its entire surface are made of a plastic, preferably made of Teflon.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (4)

  1. Elément de retenue pour au moins une pièce d'oeuvre, auquel au moins une première région de surface destinée à être traitée sous impacte d'électrolyte, ne pas au moins une région de surface ultérieure, une encapsulation à l'élément de retenue pour la région de surface ultérieure de la pièce d'oeuvre et au moins un contact électrique dans l'encapsulation pour la région de surface ultérieure étant prévus, caractérisé en ce que pour une pièce d'oeuvre, qui est assortie avec un creux sous forme d'une ouverture de passage, à laquelle la surface intérieure du creux ou la surface extérieure est destinée à être traitée sélectivement, l'élément de retenue comprend une paire d'éléments de joint étant arrangés de manière moulés à la pièce d'oeuvre au front autour le l'ouverture, qui, étant décalés axialement, sont arrangés le long d'une barre de support, dont la section, étant comprise entre les éléments de joint, est dimensionnée pour passer à travers par l'ouverture de passage.
  2. Elément de retenue selon la revendication 1, caractérisé en ce qu'un arrangement de contact électrique est prévu entre les éléments de retenue à une section de la barre prévue, préférablement une amenée électrique à l'arrangement de contact est menée à travers la barre.
  3. Elément de retenue selon une des revendications 1 ou 2, caractérisé en ce que les sections de retenue subséquentes des deux côtés vers l'extérieur des éléments de joint comprennent une surface extérieure en Wolfram et/ou Tantale et/ou en matière artificielle, préférablement en Téflon.
  4. Utilisation de l'élément de retenue selon une des revendications 1 à 3 pour des pièces d'oeuvre, auxquelles une couche en matière dure comprend au moins une des matières suivantes:
    - un nitride, un carbide, carbone nitride d'un métal ou d'un composant en métal, comme par exemple TiAlN, TiAlNC, WC, WCN, WN;
    - CrN, CrC, CrNC ou Cr.
EP03008385A 1998-04-21 1998-04-21 Élément de retenue pour au moins une pièce Expired - Lifetime EP1362934B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98913496A EP1080254B1 (fr) 1998-04-21 1998-04-21 Procede pour eliminer une couche de substance dure appliquee sur une piece en metal dur

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP98913496A Division EP1080254B1 (fr) 1998-04-21 1998-04-21 Procede pour eliminer une couche de substance dure appliquee sur une piece en metal dur
EP98913496.0 Division 1998-04-21

Publications (2)

Publication Number Publication Date
EP1362934A1 EP1362934A1 (fr) 2003-11-19
EP1362934B1 true EP1362934B1 (fr) 2011-07-20

Family

ID=29266058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03008385A Expired - Lifetime EP1362934B1 (fr) 1998-04-21 1998-04-21 Élément de retenue pour au moins une pièce

Country Status (1)

Country Link
EP (1) EP1362934B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010046372A1 (de) * 2010-09-24 2012-03-29 Oerlikon Trading Ag, Trübbach Verfahren zum Entschichten von Werkstücken

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1103103B (de) 1958-11-13 1961-03-23 Daimler Benz Ag Vorrichtung zum galvanischen Verchromen der Aussenflaeche langgestreckter zylindrischer Koerper, insbesondere von Tellerventilschaeften
US5002649A (en) * 1988-03-28 1991-03-26 Sifco Industries, Inc. Selective stripping apparatus
DE4024576A1 (de) * 1990-08-02 1992-02-06 Bosch Gmbh Robert Vorrichtung zum einseitigen aetzen einer halbleiterscheibe
US5062941A (en) * 1990-10-22 1991-11-05 Union Carbide Coatings Service Technology Corporation Electrolytic process for stripping a metal coating from a titanium based metal substrate
DE4101843C1 (en) 1991-01-23 1992-04-02 Eifeler Werkzeuge Gmbh, 4000 Duesseldorf, De Hard tool coating for economy - by stripping using tetra:sodium di:phosphate soln. and hydrogen peroxide
US5405518A (en) * 1994-04-26 1995-04-11 Industrial Technology Research Institute Workpiece holder apparatus

Also Published As

Publication number Publication date
EP1362934A1 (fr) 2003-11-19

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