[go: up one dir, main page]

WO2018150080A1 - Procédé de revêtement d'un composant de moteur à piston et composant de moteur à piston - Google Patents

Procédé de revêtement d'un composant de moteur à piston et composant de moteur à piston Download PDF

Info

Publication number
WO2018150080A1
WO2018150080A1 PCT/FI2017/050111 FI2017050111W WO2018150080A1 WO 2018150080 A1 WO2018150080 A1 WO 2018150080A1 FI 2017050111 W FI2017050111 W FI 2017050111W WO 2018150080 A1 WO2018150080 A1 WO 2018150080A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
component
piston engine
valve
solid lubricating
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.)
Ceased
Application number
PCT/FI2017/050111
Other languages
English (en)
Inventor
Aulis Silvonen
Edoardo HLEDE
Jyrki SUUTALA
Mattia PUJATTI
Mikko Turunen
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.)
Wartsila Finland Oy
Original Assignee
Wartsila Finland Oy
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 Wartsila Finland Oy filed Critical Wartsila Finland Oy
Priority to PCT/FI2017/050111 priority Critical patent/WO2018150080A1/fr
Publication of WO2018150080A1 publication Critical patent/WO2018150080A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/04—Welding for other purposes than joining, e.g. built-up welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/003—Pistons

Definitions

  • the present invention relates to a method of coating a piston engine component in accordance with claim 1 .
  • the invention also concerns a piston engine component as defined in the other independent claim.
  • a gas exchange valve comprises a valve stem and a valve head.
  • the valve head has a contact surface, which cooperates with a valve seat.
  • the contact surfaces of the valve heads and the valve seats are subjected to wear caused by friction between the surfaces. Wear of the contact surfaces can lead to leakages, which can cause various problems, such as incomplete combustion, power loss and increased emissions. Wear of the contact surfaces is increased when cleaner fuels with worse lubricating properties are used.
  • PTA Plasma Transferred Arc
  • An object of the present invention is to provide an improved method of coating a piston engine component.
  • the characterizing features of the method according to the invention are given in claim 1 .
  • Another object of the invention is to provide an improved piston engine component.
  • the characterizing features of the piston engine component are given in the other independent claim.
  • a coating matrix of a cobalt- or nickel- based alloy with solid lubricating particles embedded in the coating matrix is applied onto a surface of the component using a cold metal transfer process.
  • the piston engine component according to the invention has a coating depos- ited on the component by a cold metal transfer welding process, the coating comprising a coating matrix made of a cobalt- or nickel-based alloy and solid lubricating particles embedded in the coating matrix.
  • a piston engine component according to the invention has a coating with uniform composition and distribution of the solid lubricating particles.
  • the solid lubricating particles comprise sulfides, sulfates, silicides and/or fluorides.
  • hard carbides are embedded in the coating matrix.
  • the coating material is introduced into the coating process in the form of a flux-cored wire, where the solid lubricants are mixed in the core part of the wire.
  • the solid lubricating particles can comprise a nickel- or cobalt-coating. The coating reduces evaporation and disintegration of the compounds during the coating process.
  • additional heat is introduced into the coating process simultaneously with the cold metal transfer.
  • Certain mate- rials with limited weldability may require additional heating for preventing cracking. Additional heat can also increase the deposition rate of the coating.
  • the additional heat is introduced into the process by means of induction and/or laser.
  • the piston engine component can be a gas exchange valve or a valve seat for a gas exchange valve.
  • FIG. 1 shows a simplified cross-sectional view of a cylinder head and a cylinder of a piston engine
  • Fig. 2 shows an enlarged view of contact surfaces between a gas exchange valve and a valve seat
  • Fig. 3 shows a schematic cross-sectional view of CMT welding equipment.
  • Figure 1 shows a simplified cross-sectional view of a cylinder head 1 and a cylinder of a piston engine.
  • the engine is a large internal combustion engine, such as a main or an auxiliary engine of a ship or an engine that is used at a power plant for producing electricity.
  • the engine comprises a plurality of cylinders. Each cylinder is formed by a cylinder liner 2, which is arranged in an engine block 3.
  • the cylinder liner 2, the cylinder head 1 and a piston 4 delimit a combustion chamber 5.
  • the piston 4 is arranged to move in a reciprocating manner in the cylinder.
  • the engine comprises an intake duct 6 for introducing air into the combustion chamber 5 and an exhaust duct 7 for discharging exhaust gases from the combustion chamber 5.
  • Each cylinder of the engine is provided with at least one intake valve 8 and with at least one exhaust valve 9.
  • the intake valve 8 is used for opening and closing fluid communication between the intake duct 6 and the combustion chamber 5.
  • the exhaust valve 9 is used for opening and closing fluid communication between the combustion chamber 5 and the exhaust duct 7.
  • the intake valve 8 and the exhaust valve 9 are hereinafter also referred to as gas exchange valves 8, 9.
  • the gas exchange valves 8, 9 can be operated by means of a camshaft, hydraulic actuators, electro-hydraulic actuators or using any other similar means.
  • the engine is a gas engine, where gaseous fuel is introduced into the intake duct 6 by means of a gas admission valve 1 1 and ig- nited in the combustion chamber 5 by means of a spark plug 10.
  • the present invention could also be used in connection with any other type of piston engines.
  • the engine could thus be a compression ignition engine and it could be operated using any gaseous or liquid fuel or a combination of gase- ous and liquid fuels, such as gaseous main fuel and liquid pilot fuel.
  • Each gas exchange valve 8, 9 comprises a valve head 8a, 9a and a valve stem 8b, 9b.
  • the valve head 8a, 9a cooperates with a valve seat 12.
  • the valve seat 12 can be an integral part of the cylinder head 1 .
  • the valve seat 12 can be a separate insert arranged in the cylinder head 1 .
  • Figure 2 shows an enlarged view of the exhaust valve 9 of figure 1 .
  • the valve of figure 2 could also be an intake valve 8.
  • each gas exchange valve 8, 9 is repeated once during each engine cycle and sometimes even twice, for instance if the exhaust valve 9 is opened for exhaust gas recirculation.
  • This causes wear of the contact surfaces 13, 14 of the valve seat 12 and the gas exchange valves 8, 9.
  • the wear problem is prominent in particular when clean fuels with weak lubricating properties are used.
  • a known method for reducing the wear of the contact surfaces 13, 14 is to apply a coating on the contact surfaces 13, 14.
  • a known method for coating the contact surfaces is the use of a Plasma Transferred Arc (PTA) welding technique. In the PTA welding, the coating is deposited on a work piece by means of a plasma arc that is formed between the work piece and an electrode.
  • PTA Plasma Transferred Arc
  • the coating material can be introduced onto the work piece via the plasma torch used in the welding process or alternatively it can be applied on the work piece as slurry.
  • a problem with the PTA welding is that it is difficult to achieve coatings with uniform composition. In addi- tion, the PTA welding is not suitable for certain materials, such as superalloys, having limited weldability. Furthermore, the heat input of the PTA welding can deform the work piece and change the properties of the coating.
  • the coating is applied on a piston engine component using cold metal transfer (CMT) welding.
  • the coating comprises a coating matrix, which is made of a cobalt- or nickel-based alloy.
  • Solid lubricating particles are embedded in the coating matrix.
  • the solid lubricating particles can be sulfides, sulfates, silicides and/or fluorides. Some examples of suitable materials for the solid lubricating particles are CaF 2 , WS 2 and MoS 2 .
  • hard carbides can be embedded in the coating matrix. The hard carbides increase the hardness of the coating and also contribute to the lubricating effect.
  • the solid lubricating particles can comprise a nickel- or cobalt-coating.
  • the coating can be applied to the particles electrolytically.
  • the coating reduces evaporation and disintegration of the particles during the CMT welding.
  • the component can be a gas exchange valve 8, 9 or a valve seat 12.
  • CMT welding is an arc welding process.
  • Figure 3 shows a simplified view of CMT welding equipment.
  • a consumable wire 15 acts both as an electrode and filler metal.
  • the wire 15 is a flux-cored wire, where the solid lubricants are mixed in the core part of the wire 15.
  • the wire 15 is fed by a wire feeding device 16.
  • An electric arc is formed between the electrode 15 and the work piece, which can be a gas exchange valve 8, 9 or a valve seat 12.
  • the heat produced by the electric arc melts the work piece 12 such that a weld pool is formed.
  • the wire 15 moves towards the weld pool when the electric arc is present. As the wire 15 touches the weld pool, the electric arc is extinguished and the welding current is reduced. The wire 15 starts moving backwards, which helps in removing a blob that is formed at the end of the wire 15. The short circuit current is kept low. When the wire 15 is separated from the blob, electric arc is formed again and the process is repeated.
  • the temperature is signifi- cantly lower than in conventional welding processes.
  • the solid lubricants have a low melting point, and the lower heat input of the CMT welding reduces evaporation of the lubricating materials. Also deformations of the work piece are reduced. A coating with uniform distribution of the solid lubricating particles is thus achieved.
  • the CMT process is also suitable for coating super alloys and other materials with limited weldability.
  • Additional heat can be introduced into the coating process simultaneously with the cold metal transfer.
  • induction and/or laser can be used for introducing the additional heat.
  • the need for additional heating depends on the materials used.
  • the additional heating can be used for increas- ing the coating deposition rate.
  • the additional heat may also be needed for certain materials with limited weldability to prevent cracking.
  • the coating process can be performed also without any additional heating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)

Abstract

L'invention concerne un procédé de revêtement d'un composant de moteur à piston (8, 9, 2), dans lequel une matrice de revêtement comprenant un alliage à base de cobalt ou de nickel avec des particules lubrifiantes solides incorporées dans la matrice de revêtement est appliquée sur une surface du composant (8, 9, 12) par un procédé CMT (cold metal transfer: transfert de métal à froid).
PCT/FI2017/050111 2017-02-20 2017-02-20 Procédé de revêtement d'un composant de moteur à piston et composant de moteur à piston Ceased WO2018150080A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/FI2017/050111 WO2018150080A1 (fr) 2017-02-20 2017-02-20 Procédé de revêtement d'un composant de moteur à piston et composant de moteur à piston

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2017/050111 WO2018150080A1 (fr) 2017-02-20 2017-02-20 Procédé de revêtement d'un composant de moteur à piston et composant de moteur à piston

Publications (1)

Publication Number Publication Date
WO2018150080A1 true WO2018150080A1 (fr) 2018-08-23

Family

ID=58413128

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2017/050111 Ceased WO2018150080A1 (fr) 2017-02-20 2017-02-20 Procédé de revêtement d'un composant de moteur à piston et composant de moteur à piston

Country Status (1)

Country Link
WO (1) WO2018150080A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130092674A1 (en) * 2009-06-05 2013-04-18 Lincoln Global, Inc. Electrodes incorporating metallic coated particles and methods thereof
WO2015101699A1 (fr) * 2014-01-03 2015-07-09 Wärtsilä Finland Oy Revêtement de soudage à l'arc par transfert de plasma (pta) à utiliser sur des sièges de clapet, procédé de fabrication, revêtement pta et utilisation du revêtement pta sur des surfaces de siège de clapet
US20160325372A1 (en) * 2015-05-05 2016-11-10 Caterpillar Inc. Low heat input weld repair of cast iron

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130092674A1 (en) * 2009-06-05 2013-04-18 Lincoln Global, Inc. Electrodes incorporating metallic coated particles and methods thereof
WO2015101699A1 (fr) * 2014-01-03 2015-07-09 Wärtsilä Finland Oy Revêtement de soudage à l'arc par transfert de plasma (pta) à utiliser sur des sièges de clapet, procédé de fabrication, revêtement pta et utilisation du revêtement pta sur des surfaces de siège de clapet
US20160325372A1 (en) * 2015-05-05 2016-11-10 Caterpillar Inc. Low heat input weld repair of cast iron

Similar Documents

Publication Publication Date Title
EP2573355B1 (fr) Pointe de chambre de précombustion
DE102016102629A1 (de) PTWA-Beschichtung auf Kolben und/oder Zylinderköpfen und/oder Zylinderbohrungen
WO2015101699A1 (fr) Revêtement de soudage à l'arc par transfert de plasma (pta) à utiliser sur des sièges de clapet, procédé de fabrication, revêtement pta et utilisation du revêtement pta sur des surfaces de siège de clapet
US20190001447A1 (en) Method of manufacturing high-conductivity wear resistant surface on a soft substrate
WO2020059003A1 (fr) Procédé de formation de film
US6385847B1 (en) Seat faced engine valves and method of making seat faced engine valves
CN106141575A (zh) 一种发动机用耐高温排气门
EP2743024A1 (fr) Procédé de fabrication d'une soupape de changement de gaz et soupape de changement de gaz
KR102150124B1 (ko) 가스 교환 밸브 및 가스 교환 밸브의 제조 방법
WO2018150080A1 (fr) Procédé de revêtement d'un composant de moteur à piston et composant de moteur à piston
DK2228462T3 (en) A method of applying a coating to an item's seating face
CN114525504B (zh) 汽车气缸盖阀座
US9404400B2 (en) Cylinder head with valve seat and method for the production thereof
US10273869B2 (en) Prechamber ignition device for internal combustion engine, and method
CN115053059B (zh) 汽缸盖及其耐腐蚀性提高方法
Rao et al. Petrol engine exhaust valve design, analysis and manufacturing processes
CN113084457A (zh) 一种活塞的金相强化制造方法
Xu The remanufacturing engineering and automatic surface engineering technology
FI126955B (en) FE-based composition, precursor component and process for producing precursor component
WO2012024019A1 (fr) Préoxydation de soupapes de moteur et sièges rapportés pour durée de vie améliorée
US20140345557A1 (en) Thermal Spray Coated Engine Valve for Increased Wear Resistance
Morgan Aero-Engine Exhaust Valve Development
US10519843B2 (en) Valve body of a gas exchange valve, gas exchange valve and internal combustion engine
KR20160148399A (ko) 엔진용 밸브 및 그것의 제조 방법
CN116921808A (zh) 一种内燃机气门密封面的堆焊方法及内燃机气门

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17713706

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17713706

Country of ref document: EP

Kind code of ref document: A1