EP1115520A1 - Procede permettant de revetir une surface d'un agent de separation - Google Patents

Procede permettant de revetir une surface d'un agent de separation

Info

Publication number
EP1115520A1
EP1115520A1 EP99969361A EP99969361A EP1115520A1 EP 1115520 A1 EP1115520 A1 EP 1115520A1 EP 99969361 A EP99969361 A EP 99969361A EP 99969361 A EP99969361 A EP 99969361A EP 1115520 A1 EP1115520 A1 EP 1115520A1
Authority
EP
European Patent Office
Prior art keywords
powder
coating
fluidized
air
press
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.)
Granted
Application number
EP99969361A
Other languages
German (de)
English (en)
Other versions
EP1115520B1 (fr
Inventor
Peter Matje
Hans-Uwe Roehlinger
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.)
Wacker Chemie AG
Original Assignee
Wacker Chemie AG
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 Wacker Chemie AG filed Critical Wacker Chemie AG
Publication of EP1115520A1 publication Critical patent/EP1115520A1/fr
Application granted granted Critical
Publication of EP1115520B1 publication Critical patent/EP1115520B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns

Definitions

  • the invention relates to methods for coating a surface with a release agent.
  • a preheated aluminum block (Al block) with a preferably round cross-section is pressed over a recipient (container) by means of a press ram through the shaping press tool, thus formed into a profile and then cooled after leaving.
  • the front part of the press ram also called the press disk, must perform the following tasks: 1. It must seal the recipient against the direction of the press; 2. It must separate itself slightly from the aluminum when the plunger is pulled back.
  • the remaining aluminum baling residue is removed with a shear knife (baling shear) before the next AI block is processed.
  • Carbon black is used as a common release agent to separate the pressure plate and the AI block; the soot is deposited on an end face of the Al block by burning an acetylene flame. This process must be repeated for each new AI block. Oils are usually used to coat the press scissors, which evaporate on contact with the hot AI and thereby achieve a separating effect.
  • pigment-free recipes are used, which are based on water or mineral oils with additives.
  • pigment-containing formulations of release agents are also used.
  • the pigments used comprise a whole series of solids such as, for example, graphite, MoS 2 , BN or talc.
  • soot As a special case, all the release agents known to date have in common that they must be used in the form of liquid suspensions or emulsions. They are usually applied by spraying onto warm to very hot surfaces. At high temperatures, there is a risk of ignition of volatile components or existing solvents or loss of the active ingredient if it evaporates suddenly in contact with the hot surface. In addition, the evaporation products represent a considerable burden on the ambient air, which is further increased by the formation of decomposition products. As a rule, a large part of the components end up in the water cycle, which is installed in the area of the systems, and must be removed at this point in a time-consuming process.
  • the coating should be applied evenly, quickly and economically.
  • the object is achieved by a method which is characterized in that a BN powder is applied to the surface by means of an electrostatic coating.
  • the surface to be coated can e.g. around the surface of the molding die, e.g. the press disk or the press scissors act. In principle, however, it is also possible to treat the surface of the non-ferrous metal that is contacted with the press ram. Since the separating layer applied by means of the method according to the invention has good surface adhesion, the surfaces of the shaping press tool which come into contact with the non-ferrous metal are preferably treated, since this treatment must be repeated after 3 press cycles at the earliest.
  • Some powders include high consumption, an irregular coating of the surface, and clogging of the nozzle of the application device.
  • An irregular coating can lead to an uncontrollable sticking or sticking of the non-ferrous metal at the contact point of the non-ferrous metal with the metallic material.
  • BN powders which have a fineness corresponding to a specific surface area of 10-50 m 2 / g are preferably used.
  • the BN powders particularly preferably have a specific surface area of 10-30 m 2 / g, in particular a specific surface area of 10-20 m 2 / g.
  • the powder also preferably has a boric acid and boron oxide content, given as B 2 O 3, below 5%, particularly preferably below 0.5%.
  • B 2 O 3 a boric acid and boron oxide content
  • the content of the various boric acids such as, for example, meta or ortho boric acid and of boron oxides is, as is customary in the prior art, indicated as B 2 0 3 content after their analysis.
  • the moisture content of the powder is preferably indicated as H 2 0 content less than 1%, particularly preferably less than 0.2%.
  • the BN powder is fluidized in a storage container with a fluidizing gas.
  • the fluidizing gas is usually compressed air.
  • Other inert gases such as N 2 , noble gases or gas mixtures can also be used.
  • the fluidized BN powder is charged electrostatically. This is done, for example, as is customary for powder coatings, in a commercially available paint spraying device for powder coatings. A voltage of 75-80 kV is preferably used to charge the BN particles.
  • the fluidized BN powder is sprayed onto the surface when loaded and evenly coats the intended parts. This is done analogously to a conventional powder coating.
  • the throughput of BN powder is preferably adjusted to the values suitable for coating by the conveying gas pressure and the nozzle geometry (especially the nozzle diameter).
  • the conveying air is therefore preferably used at 0.5 - 1.5 bar, the fluidizing air at 0.3 - 0.8 bar.
  • the total air volume is about 5 - 8 m 3 / hour.
  • BN powders applied by means of the process according to the invention have a sufficiently high adhesion to the medium to be coated (for example a press disk), without the addition of binders being necessary.
  • the invention thus also relates to the use of BN powders as a release agent in the shaping of non-ferrous metals and a release agent consisting of BN powder.
  • BN powders are preferably the BN powders mentioned as being preferred.
  • the coating carried out by means of the method according to the invention is more durable than the conventional release agent coating. It enables multiple
  • the coating method according to the invention has proven to be extremely simple, quick and convenient to carry out.
  • Powders suitable for use in the process according to the invention are available on the market in a wide range of properties.
  • Suitable for use in the process according to the invention can also be made from commercially available hexagonal BN powder.
  • the B 2 0 3 content of the powder is reduced by washing z. B. with water or alcohols to the desired value.
  • Excessively high moisture contents may be reduced by means of drying, for example in conventional drying cabinets, with protective gas or vacuum drying in order to achieve the values necessary for the powder according to the invention.
  • the bulk density of the BN powder required according to the invention is optionally adjusted by grinding the possibly pretreated BN powder. It is important to ensure that there is no excessive moisture absorption during grinding.
  • BN powder and the outstanding separating effect of BN compared to AI.
  • the use of the powder is not limited to AI; the application of BN powder according to the invention by means of electrostatic coating without any binders and free of other substances such as solvents is also suitable for processing a number of other non-ferrous metals such as e.g. B. Cu, Zn, Mg, Pb, Sn or their alloys are suitable.
  • the invention therefore also relates to the use of the method according to the invention for coating surfaces when extruding non-ferrous metals.
  • the non-ferrous metals are preferably Cu, Zn, Mg, Pb, Sn and their alloys.
  • Example 1 The following examples serve to further describe the invention: Example 1;
  • BET surface area of 14.5 m 2 / g, a B 2 0 3 content of 0.12%, a moisture content of 0.25% H 2 0 and a bulk density of 0.55 g / cm 3 (powder I) was ground in a pin mill with a throughput of 20 kg / hour.
  • the powder thus obtained (Powder II) had a spec.
  • Powder II was electrostatically coated (Fa.
  • Fluidizing air 5 m 3 / h Amount of air for conveying
  • a press disk with a diameter of 20 cm.
  • a hexagonal BN powder with a fineness corresponding to a specific surface area of 6 m 2 / g and a B 2 0 3 content of 9% (powder III) with a bulk density of 0.6 g / cm 3 was ground in a ball mill a specific surface area of 15m 2 / g was reached.
  • the powder IV thus obtained was dispersed several times with water and washed out until the B 2 0 3 content was reduced to 0.1%. Finally, the powder was dried in vacuo at 60 ° C. to a residual moisture of 0.2% and ground in a rotor mill to destroy the agglomerates.
  • the consumption corresponded to the value from Example 1.
  • the coating was uniform and allowed to use press disks that had come into contact with the layer three times before renewed coating to form Al.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Extrusion Of Metal (AREA)

Abstract

L'invention concerne un procédé permettant de revêtir une surface d'un agent de séparation, caractérisée en ce qu'une poudre BN est appliquée sur la surface par revêtement électrostatique.-
EP99969361A 1998-09-17 1999-09-16 Procede permettant de revetir une surface d'un agent de separation Expired - Lifetime EP1115520B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19842660A DE19842660A1 (de) 1998-09-17 1998-09-17 Verfahren zur Beschichtung einer Oberfläche mit einem Trennmittel
DE19842660 1998-09-17
PCT/EP1999/006850 WO2000016931A1 (fr) 1998-09-17 1999-09-16 Procede permettant de revetir une surface d'un agent de separation

Publications (2)

Publication Number Publication Date
EP1115520A1 true EP1115520A1 (fr) 2001-07-18
EP1115520B1 EP1115520B1 (fr) 2002-06-19

Family

ID=7881318

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99969361A Expired - Lifetime EP1115520B1 (fr) 1998-09-17 1999-09-16 Procede permettant de revetir une surface d'un agent de separation

Country Status (10)

Country Link
EP (1) EP1115520B1 (fr)
JP (1) JP2002526265A (fr)
CN (1) CN1318000A (fr)
BR (1) BR9913865A (fr)
CA (1) CA2345922A1 (fr)
DE (2) DE19842660A1 (fr)
ES (1) ES2179700T3 (fr)
PL (1) PL347358A1 (fr)
TW (1) TW475909B (fr)
WO (1) WO2000016931A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19945461A1 (de) * 1999-09-22 2001-04-19 Linde Gas Ag Verfahren zur Verbesserung des Magnesium-Druckgußprozesses
DE10326769B3 (de) * 2003-06-13 2004-11-11 Esk Ceramics Gmbh & Co. Kg Dauerhafte BN-Formtrennschichten für das Druckgießen von Nichteisenmetallen
DE102005021688A1 (de) * 2005-05-11 2006-11-16 Volkswagen Ag Einsatz von Trennmitteln im Schwerkraft-Kokillenguss
DE102005042475A1 (de) 2005-09-07 2007-03-08 Ks Aluminium-Technologie Ag Formtrennschicht für das Gießen von Nichteisenmetallen
DE102006010876A1 (de) 2006-03-07 2007-09-13 Ks Aluminium-Technologie Ag Formtrennschicht für das Gießen von Nichteisenmetallen
EP2087953B8 (fr) * 2007-03-28 2020-01-01 Aoki Science Institute Co., Ltd. Agent de demoulage a base d'huile pour la coulee sous pression et son usage en pulverisation electrostatique
JP4452310B2 (ja) * 2008-06-13 2010-04-21 新日本製鐵株式会社 鉄系合金の半溶融または半凝固状態での鋳造方法および鋳造用金型
JP5563947B2 (ja) * 2010-10-04 2014-07-30 昭和電工株式会社 押出加工方法及び押出加工装置
TWI505881B (zh) * 2012-07-18 2015-11-01 Min Chi University Of Technology 改善金屬鑄造模具脫模效果的方法
CL2014000872A1 (es) * 2014-04-08 2014-08-22 Asesorias Y Servicios Innovaxxion Spa Proceso para la conformacion de anodos de cobre en una rueda de moldeo desde que el cobre esta en estado liquido fundido en una canaleta basculante y es traspasado a una cuchara, porque comprende los pasos de verter cobre liquido fundido desde una canaleta distribuidora basculante hacia una cuchara, conectar los componentes metalicos de la cuchara, arrojar hacia el labio de la cuchara un chorro de aire, conectar los componentes metalicos.
DE102014218449A1 (de) * 2014-09-15 2016-03-17 Schunk Kohlenstofftechnik Gmbh Gussform und Verfahren zur Herstellung
CN109465163A (zh) * 2018-12-28 2019-03-15 深圳市银宝山新科技股份有限公司 高固相半固体工件表面喷涂方法
CN110614291A (zh) * 2019-10-24 2019-12-27 亚太轻合金(南通)科技有限公司 便于热挤压铝棒与挤压杆分离的方法及其装置
KR102639387B1 (ko) * 2021-07-20 2024-02-23 동국제강 주식회사 복수의 티타늄 슬라브가 적층된 팩 슬라브의 열간압연 후 티타늄 합금 박판재를 분리하기 위한 이형제, 슬라브의 이형제 도포장치 및 이를 이용하는 슬라브의 이형제 도포 방법

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH629845A5 (en) * 1977-10-26 1982-05-14 Bbc Brown Boveri & Cie High-temperature lubricant
JPH0688119B2 (ja) * 1988-05-25 1994-11-09 株式会社アーレスティ ダイカスト鋳造法
DE4017603C1 (fr) * 1990-05-31 1991-07-18 Wagner International Ag, Altstaetten, Ch
US5437326A (en) * 1992-08-18 1995-08-01 Hazelett Strip-Casting Corporation Method and apparatus for continuous casting of metal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0016931A1 *

Also Published As

Publication number Publication date
PL347358A1 (en) 2002-04-08
ES2179700T3 (es) 2003-01-16
DE59901823D1 (de) 2002-07-25
EP1115520B1 (fr) 2002-06-19
JP2002526265A (ja) 2002-08-20
CA2345922A1 (fr) 2000-03-30
CN1318000A (zh) 2001-10-17
DE19842660A1 (de) 2000-03-30
BR9913865A (pt) 2001-06-05
TW475909B (en) 2002-02-11
WO2000016931A1 (fr) 2000-03-30

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