US20150285109A1 - Exhaust valve for an internal combustion engine, and a method of strengthening an annular valve seat area in an exhaust valve - Google Patents

Exhaust valve for an internal combustion engine, and a method of strengthening an annular valve seat area in an exhaust valve Download PDF

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Publication number
US20150285109A1
US20150285109A1 US14/678,057 US201514678057A US2015285109A1 US 20150285109 A1 US20150285109 A1 US 20150285109A1 US 201514678057 A US201514678057 A US 201514678057A US 2015285109 A1 US2015285109 A1 US 2015285109A1
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Prior art keywords
valve
annular
seat area
exhaust valve
valve seat
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Abandoned
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US14/678,057
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English (en)
Inventor
Harro Andreas Hoeg
Christian SKAANING
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MAN Energy Solutions Filial af MAN Energy Solutions SE
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MAN Diesel and Turbo Filial af MAN Diesel and Turbo SE
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Assigned to MAN DIESEL & TURBO, FILIAL AF MAN DIESEL & TURBO SE reassignment MAN DIESEL & TURBO, FILIAL AF MAN DIESEL & TURBO SE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SKAANING, CHRISTIAN, HOEG, HARRO ANDREAS
Publication of US20150285109A1 publication Critical patent/US20150285109A1/en
Priority to US16/030,252 priority Critical patent/US10443456B2/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/20—Making machine elements valve parts
    • B21K1/22—Making machine elements valve parts poppet valves, e.g. for internal-combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
    • B23P15/002—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings poppet valves
    • F01L2103/00—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2301/00—Using particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00—Manufacturing of components used in valve arrangements

Definitions

  • the present invention relates to an exhaust valve for an internal combustion engine, the exhaust valve comprising a valve disc having a first side and a second side, a valve stem extending from the first side of the valve disc, and an annular valve seat area located at the first side of the valve disc, which annular valve seat area is of a nickel-base alloy or a chromium-base alloy and has a valve seat surface.
  • EP 0 521 821 B1 discloses an exhaust valve comprising a valve disc having a first side provided with an extending valve stem and an annular valve seat area with a valve seat surface.
  • the annular valve seat area is of a nickel-base alloy or a chromium-base alloy. Forging may be used to globally shape the valve seat area. Hot deformation is recommended in order to distribute carbide formations within the material in order to obtain improved corrosion resistance.
  • WO 97/47862 discloses an exhaust valve disc having a base body of austenitic stainless steel and a valve seat area of a nickel-base material provided by welding or by a HIP process.
  • the yield strength of the valve seat area may be increased by cold-working of the material, such as by rolling or forging the valve seat area.
  • the initially mentioned exhaust valve according to the present invention is characterized in that the annular valve seat area has at least a first annular portion located in between two second annular portions, which first annular portion has lower hardness than the two second annular portions.
  • the first annular portion of lower hardness has higher ductility than the two second annular portions, and the location of the first annular portion in between the two second annular portions in the valve seat area allows elastic valve seat deformation to occur more in the first annular portion than in the second annular portions.
  • the harder and less ductile second annular portions may thus be less affected by loads caused by temperature changes when the engine initiates operation or is taken out of operation or is significantly changing engine load.
  • the engine is typically operated at almost constant engine load—typically full engine load—for several or many days in a row while sailing across seas from one destination to another, and then operated at low engine load while the vessel approaches and enters a port.
  • valve seat area is part of the first side of the valve disc and is thus facing away from the combustion chamber in the engine cylinder.
  • the valve seat area has a conical outer surface and due to the resulting changes in thickness of the valve disc at the valve seat area the loadings caused by thermal changes of the valve disc are of significance.
  • the first annular portion in the valve seat area reduces the amount of high hardness alloy material in the valve seat area, as the high hardness alloy material is localised in the two second annular portions.
  • valve seat area In the prior art exhaust valves the entire valve seat area is subjected to plastically deformation in order to improve the hardness or yield strength of the valve seat alloy.
  • the first annular portion of lower hardness requires that plastic deformation is avoided, or not performed to the same extent as in the second annular portions. As less plastic deformation is required, the manufacturing of the valve seat area is facilitated and the plastic deformation carried out may be more precise because the volumes of material to be deformed are smaller.
  • the average hardness at the valve seat surface at the middle of the first annular portion is at least 80 HV lower than the average hardness at the middle of the surface of at least one of the second annular portions.
  • the material of the two second annular portions has a crystallographic grain structure of cold deformation and age hardening below recrystallization temperature.
  • the age hardening is not mandatory, but presents an advantageous manner of improving the hardness of the two second annular portions when the alloy of the valve seat area is capable of age hardening.
  • the material of the first annular portion has a crystallographic grain structure without cold deformation.
  • the ductility of the material of the first annular portion is about as high as possible for the given alloy and geometry of the valve seat area.
  • valve disc carrying the annular valve seat area comprises a base body of stainless steel.
  • the stainless steel provides suitably high strength and the stainless steel alloys are readily available.
  • valve disc comprises at its second side a layer of a hot corrosion resistant material.
  • the second side of the valve disc faces the combustion chamber and is thus subjected to high temperatures in operation and also to corrosive combustion residues adhering to the surface of the disc.
  • the layer of hot corrosion resistant material may improve the life time of the exhaust valve.
  • the present invention relates to a method of strengthening an annular valve seat area in an exhaust valve for an internal combustion engine, which exhaust valve comprises a valve disc having a first side and a second side, a valve stem extending from the first side of the valve disc, and an annular valve seat area located at the first side of the valve disc.
  • a valve disc with a raw seat area is provided, which raw seat area has at least two annular protrusions separated by an intermediate annular area,
  • valve disc with the annular valve seat area is subjected to heat treatment involving at least an aging heat treatment.
  • the separation of the two annular protrusions by the intermediate annular area reduces the area available for the annular protrusions, and they consequently have much less volume than the above-mentioned prior art lobe, and the deformation in step b) thus requires less forces.
  • the deformation of the protrusions in step b) and the machining in step c) form the two second annular portions in the valve seat area, and the first annular portion is located in or formed by the intermediate annular area.
  • the smaller size of the two annular protrusions also reduces the need for excess material in the raw seat area, and the valve disc with the raw seat area can be shaped closer to the final dimensions of the valve disc and thus alloying material is saved and the need for machining in step c) is also reduced.
  • the plastic deformation can be effected by forging, but preferably the plastic deformation in step b) involves rolling with a cylindrically shaped roll.
  • the cylindrically shaped roll is in contact with only a small portion of the annular protrusion at a time because the roll is arranged during rolling with its rotational axis extending in a direction approximately orthogonal to the circular path of the annular protrusion. It is a distinct advantage that the complete width of the annular protrusion is rolled simultaneously by the roll and that the roll extends to both sides of the annular protrusion because the plastically deformed material cannot just be pressed aside into a ridge but is pressed into the material of the valve seat area below the roll. It is possible to roll the raw seat area into the shape of the completed valve seat area and then perform the machining in step c) as a grinding.
  • the one annular protrusion is located at a larger distance from the stem than the other annular protrusion. It is naturally possible to use only a single roll for the annular protrusions and to roll both protrusions in a common rolling operation, or to roll the one protrusion first, and then roll the other protrusion. It is also possible to use a separate cylindrically shaped roll for each annular protrusion which allows the roll located at the larger distance to rotate at a slightly higher speed than the other roll.
  • the separate cylindrically shaped rolls are preferably carried by a common rolling tool, but are allowed to rotate during rolling with mutually different rotational speeds.
  • the individual annular protrusion provided in step a) may have different shapes, such as a shape with a curved central portion.
  • the top of the curve can be located at a radial position where the second annular portion should have the highest hardness.
  • FIG. 1 illustrates a vertical section through a cylinder of an internal combustion engine
  • FIG. 2 depicts an exhaust valve according to the present invention
  • FIG. 3 is a cross sectional view of a valve seat raw area
  • FIG. 4 illustrates a prior art rolling method for a valve seat area
  • FIG. 5 is a cross sectional view through the valve seat raw area after applying the prior art rolling method of FIG. 4 ,
  • FIG. 6 illustrates the hardness distribution in the completed valve seat area manufactured with the prior art rolling method of FIG. 4 .
  • FIG. 7 illustrates a section through an outer area of the exhaust valve disc and a stationary valve housing part
  • FIG. 8 illustrates a section through a first embodiment of raw seat area having two annular protrusions separated by an intermediate annular area in accordance with the present invention
  • FIG. 9 is an illustration of a rolling tool and a valve disc for the method according to the present invention.
  • FIG. 10 illustrates a vertical cross section through a valve seat area in according to the present invention
  • FIG. 11 illustrates the hardness distribution in a rolled valve seat area treated with the method of the present invention
  • FIG. 12 illustrates a section corresponding to FIG. 8 through a second embodiment of raw seat area in accordance with the present invention.
  • An exhaust valve 1 is viewed in FIG. 1 in an open position allowing intake air to be supplied from a turbocharger 2 to a scavenge air receiver 3 via a scavenge air cooler 4 and a water mist catcher 5 .
  • the intake and scavenge air flows from the scavenge air receiver through a row of scavenge air ports 6 in the lower end of a cylinder 7 and upwards through the cylinder in a swirling motion and up towards the upper portion of the cylinder, while at the same time pressing out hot combustion gasses via the open exhaust valve and into the exhaust gas receiver 8 .
  • the flow of hot combustion gasses past the valve seats of the exhaust valve can occur at high gas speeds, in particular when the valve opens and closes.
  • the exhaust valve 1 is mounted in an exhaust valve housing 9 that is fixed to a cylinder cover 10 at the top of the cylinder. In the closed position of the exhaust valve, a valve seat area 11 on the upper side of a valve disc 12 abuts a corresponding valve seat on a stationary part 13 , also called the bottom piece, of the valve housing.
  • the valve disc has a first side 14 facing upwards towards exhaust channel 15 and a second side 16 facing downwards to combustion chamber 17 in the cylinder 7 .
  • a valve stem 18 extends centrally from the first side 14 and has a portion 19 for mounting of valve rotator wings, a bearing area 20 for positioning in a stationary valve guide in the valve housing, a groove 21 for mounting of an air spring piston or a spring end support, and an upper end area 22 for mounting at an actuator piston in a hydraulic valve actuator.
  • the upper end of the stem may alternatively be actuated by a cam in a traditional manner.
  • the stationary part 13 can be cooled by water.
  • the stem 18 In the mounted position of the exhaust valve, the stem 18 extends upwards from the valve disc and passes the exhaust channel and continues upwards through the valve guide and up into an exhaust valve actuator.
  • a piston of a pneumatic spring is mounted to the outside of the stem.
  • a hydraulic actuator piston at the top of the stem can activate the exhaust valve for downward movement, and the pneumatic spring acts in the opposite direction and closes the exhaust valve when the pressure in the hydraulic actuator is relieved.
  • the embodiment illustrated in FIG. 2 is an exhaust valve for an engine of one of the types ME or MC of applicant's brand.
  • the exhaust valve could also be mechanically actuated in well-known manner, and a mechanical return spring could also be used.
  • the portion of the stem located in the exhaust channel is provided with oblique fins extending out radially from the stem. These fins cause the exhaust valve to rotate some degrees in the circumferential direction when the exhaust gas is flowing out. In another embodiment the stem does not have such fins.
  • the exhaust valve can be for a four-stroke internal combustion engine, or it can be for a two-stroke internal combustion engine, preferably a large two-stroke crosshead engine, which may have cylinder diameters ranging from 250 to 1100 mm.
  • the outer diameter of the valve disc 12 is in the range from 100 mm to 600 mm, depending on the cylinder bore, when the valve is for such large two-stroke engines.
  • the internal combustion engine utilizing the exhaust valve spindles may be of the make MAN Diesel & Turbo, such as of the type MC or ME, or may be of the make Wartsila or Sulzer Diesel, such as of the type RTA of RTA-flex, or may be of the make Mitsubishi.
  • the outer diameter of the valve disc 12 is typically in the range from 50 mm to 300 mm.
  • Valve seat area 11 is in general annular and conical and located next to an outer end portion of the valve disc.
  • the valve seat area can be of the same alloy as the remainder of the exhaust valve, or it can be of a different alloy deposited in a groove 23 on a base body 24 , as illustrated in FIG. 3 .
  • groove 23 is filled with six weld seams 25 .
  • the rolling depth 28 below the outer surface of the raw seat represents excess material that must be removed after rolling, such as by machining on a lathe.
  • a reference sample was manufactured of an Inconel 718 valve seat alloy welded onto a stainless steel base body. Rolling was performed as illustrated in FIG. 4 with the results as presented in FIG. 5 . The excess material was removed by turning on a lathe. The valve disc was subjected to age hardening. The hardness of the resulting valve seat area is illustrated in FIG. 6 . The following hardness values have been achieved: areas marked 29 hardness 575 HV; areas marked 30 hardness 550 HV; areas marked 31 hardness 525 HV; areas marked 32 hardness 500 HV; areas marked 33 hardness 475 HV; and areas marked 34 hardness 450 HV.
  • FIG. 7 An example of a stationary valve housing part 13 is illustrated in FIG. 7 .
  • a section is shown through an outer area of the exhaust valve disc and a stationary valve housing part having seat surfaces 35 , 36 abutting the valve seat area 11 when the exhaust valve is in closed position.
  • the stationary valve housing part can have a single seat surface substantially covering the outer surface of the valve seat area.
  • the valve disc 12 with a raw seat area is provided.
  • the raw seat area has two annular protrusions 37 separated by an intermediate annular area 38 .
  • the annular protrusions 37 have less width than the intermediate annular area 38 .
  • the two annular protrusions 37 are then plastically deformed by rolling with a rolling tool 39 as illustrated in FIG. 9 .
  • the rolling tool has a roll 40 which is cylindrically shaped and mounted in the tool so that the roll can rotate about central axis 41 , which extends in parallel with the cylindrical outer surface of the roll. During rolling the rolling tool presses the roll against the seat raw area with sufficient force to cause plastic deformation of the annular protrusions.
  • a load of 5 to 10 t on the roll may be suitable for generating the required force for rolling a seat area on a valve disc having an outer diameter of about 0.35 m.
  • the rolling tool is positioned with central axis 41 in parallel with the outer surface of the valve seat area 11 , and the valve disc is fixed on a rotating table.
  • the rotating table rotates the valve disc about the longitudinal axis of the valve and thus the roll 40 rolls on the valve seat area.
  • the rolling tool may also be embodied with two rolls both rotating about axis 41 , and the rolling tool may then be positioned so that the one roll is pressing only on one of the annular protrusions, and the other roll is pressing only on the other of the annular protrusions.
  • the annular protrusions After completion of the rolling the annular protrusions have been plastically deformed into the valve seat area so that the outer surface of the valve seat area 11 follows a conical surface.
  • the individual annular protrusion 37 has thus been deformed into a second annular portion 42 of the valve seat area, and a first annular portion 43 is located in between the second annular portions 42 .
  • the first annular portion 43 has lower hardness than the two second annular portions 42 because the first annular portion has not been subjected to the same amount of plastic deformation as the second annular portions.
  • valve seat area The hardness distribution in the valve seat area is depicted in FIG. 11 for an example of a valve disc having an outer diameter of 0.35 m and a base body of stainless steel (SNCrW stainless steel) and a valve seat area of alloy Inconel 718 (Inconel is a trade mark of Special Metals Corporation) of 53% nickel+cobalt, 19% chromium, 18% iron, 5.3% niobium, 3% molybdenum, 0.9% titanium, 0.5% aluminium, less than 1% cobalt, less than 0.08% carbon, less than 0.35% manganese, less than 0.35% silicon, less than 0.015% phosphorus, less than 0.015% sulfur, less than 0.006% boron, less than 0.3% copper, and unavoidable impurities.
  • alloy Inconel 718 Inconel is a trade mark of Special Metals Corporation
  • the rolling was performed with a loading of 10 t on the rolling tool.
  • the valve disc was subjected to an aging heat treatment at 720° C. for six hours followed by 620° C. for six hours. As an alternative the aging heat treatment may be performed for 10 hours at 730° C.
  • a piece was cut from the valve seat area and the hardness was measured. The hardness distribution is illustrated in FIG. 11 , and the values are given in HV in the following table 1 .
  • the area of highest hardness of 588 HV was located at the middle of the second annular portion at about 0.3 mm below the outer surface.
  • the outermost material is removed to a depth of 0.2 mm as indicated by the broken line in FIG. 11 .
  • the annular protrusions 37 in the raw seat area on valve disc 12 may have other configurations, such as the one illustrated in FIG. 12 where the central portion of the protrusion 37 is flat. Hardness distributions in the valve seat area have been found for some different embodiments of the protrusions.
  • the height h of the protrusion and the angle ⁇ for the sides of the protrusion are illustrated in FIG. 12 .
  • the protrusion having a height of 0.8 mm provided a hardness of 504 HV and a slightly lower hardness of about 450 HV at the middle of the surface of the second annular portion.
  • the protrusion having a height of 1.0 mm provided a hardness of 502 HV and a slightly lower hardness of about 475 HV at the middle of the surface of the second annular portion.
  • the protrusion having a height of 1.0 mm provided a hardness of 575 HV and a slightly lower hardness of about 450 HV at the middle of the surface of the second annular portion.
  • the protrusion having a height of 1.5 mm provided a hardness of 599 HV and a quite even hardness of about 500 HV across the width of the surface of the second annular portion.
  • the protrusion having a height of 2.0 mm provided a hardness of 619 HV and a quite even hardness of about 520 HV across the width of the surface of the second annular portion.
  • the hardness of the first annular portion was much lower than the hardness of the second annular portions.
  • the hardness of the first annular portion was generally in the range from 200 HV to 300 HV, and in most examples the hardness of the first annular portion was generally in the range from 200 HV to 260 HV.
  • the first annular portion is thus providing the valve seat area with a significantly increased ductility. If the stationary valve housing part has two seat surfaces 35 , 36 the second annular portions 37 are preferably located so as to abut seat surfaces 35 , 36 when the valve is in closed position.
  • the second annular portions 37 are preferably located so as to both abut this seat surface when the valve is in closed position. It is preferred that the average hardness at the valve seat surface at the middle of the first annular portion is at least 80 HV lower than the average hardness at the middle of the surface of at least one of the second annular portions. This average hardness is found by measuring the hardness at least at five positions distributed along the circle located at the middle of the surface of the portions, and then finding the average of the measured values. The difference in average hardness may be only 50 HV or may be larger than 80 HV, such as 150 HV, 250 HV or 300 HV.
  • the hardness of the first annular portion was generally in the range from 200 HV to 260 HV, and the hardness of the second annular portions was generally higher than 460 HV, which makes the difference at least 200 HV.
  • the valve seat area can be of a nickel-based alloy, which alloy stated in percent-by-weight and apart from common impurities and inevitable residual amounts of deoxidizing components comprises at least from 34.0 to 44.0% Cr, an aggregate amount of Nb and Ta in the range from at least 2.8 to 6.1%, from 0.3 to 2.0% Ti, a balance of Ni, and optionally one or more of the components at the most 0.2% Al, at the most 0.04% B, at the most 0.8% Fe, at the most 0.04% C, and at the most 0.4% Si.
  • valve seat area can be of a nickel-based alloy comprising at least the components 10-25% Cr, 5-25% Co, 2-23% Ta, a balance of Ni, and optionally one or more of the components up to 10% Mo+W, up to 11% Nb, up to 4% Ti, up to 3% Al, up to 0.3% C, up to 1% Si, up to 0.015% S, up to 5% Fe, and up to 3% Mn.
  • valve seat area can be of a nickel-based alloy comprising at least the components 20-23% Cr, 8-10% Mo, 3.15-4.15% Ta+Nb, a balance of at least 58% Ni, and optionally one or more of the components up to 5% Fe, up to 0.1% C, up to 0.5% Mn, up to 0.5% Si, up to 0.4% Al, up to 0.4% Ti, up to 1.0% Co, up to 0.015% Si, and up to 0.015% P.
  • the valve seat area can be of a nickel-based alloy comprising at least the components 27-30% Cr, 7-11% Fe, up to 0.05% C, optionally small amounts of Mg, Co, Si and a balance of at least 58% Ni.
  • valve seat area can be of an alloy comprising at least the components 10-25% Cr, 3-12% Nb and/or Ta, 5-25% Fe, and a balance of nickel and/or cobalt.
  • valve seat area can be of an alloy comprising at least the components 0.04-0.08% C, 46-49% Cr, 0.3-0.5% Ti, and a balance of Ni.
  • the entire valve disc, and thus also the valve seat area can be of the alloy Nimonic 80A (Nimonic is a trade mark of Special Metals Corporation) comprising at least the components 18-21% Cr, 1.8-2.7% Ti, 1.0-1.8% Al, at the most 3.0% Fe, at the most 2.0% Co, and as balance Ni.
  • valve disc comprises a base material of stainless steel it can be a stainless steel, such as an alloy having 0.25% C, 1.4% Si, 1.3% Mn, 20% Cr, 9% Ni, 3% W, and the balance Fe.
  • Other stainless steels can also be used and are well-known in the art of exhaust valves.
  • valve disc 12 comprises at its second side a layer of a hot corrosion resistant material, such as a layer of a nickel-based alloy comprising at least the components 20-23% Cr, 8-10% Mo, 3.15-4.15% Ta+Nb, a balance of at least 58% Ni, and optionally one or more of the components up to 5% Fe, up to 0.1% C, up to 0.5% Mn, up to 0.5% Si, up to 0.4% Al, up to 0.4% Ti, up to 1.0% Co, up to 0.015% Si, and up to 0.015% P.
  • a hot corrosion resistant material such as a layer of a nickel-based alloy comprising at least the components 20-23% Cr, 8-10% Mo, 3.15-4.15% Ta+Nb, a balance of at least 58% Ni, and optionally one or more of the components up to 5% Fe, up to 0.1% C, up to 0.5% Mn, up to 0.5% Si, up to 0.4% Al, up to 0.4% Ti, up to 1.0% Co, up to 0.015% Si, and up to 0.01
  • valve seat area is of an alloy different from the alloy of the base body of the exhaust valve
  • the valve seat area can be deposited in a groove 23 on a base body 24 by welding with several weld seams.
  • the welding can be performed by plasma welding, laser welding, gas metal arc welding or gas tungsten arc welding.
  • the valve seat area can alternatively be deposited by processes like cold-spraying or HIP. In embodiments having a layer of a hot corrosion material on the second side of the valve disc, the mentioned processes can likewise be applied to deposit the layer.

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US14/678,057 2014-04-08 2015-04-03 Exhaust valve for an internal combustion engine, and a method of strengthening an annular valve seat area in an exhaust valve Abandoned US20150285109A1 (en)

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US16/030,252 US10443456B2 (en) 2014-04-08 2018-07-09 Exhaust valve for an internal combustion engine, and a method of strengthening an annular valve seat area in an exhaust valve

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230399961A1 (en) * 2020-10-21 2023-12-14 Nissan Motor Co., Ltd. , Cylinder head blank and cylinder head manufacturing method

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3088776B1 (en) * 2014-08-27 2018-03-07 Nittan Valve Co., Ltd. Poppet valve and method for manufacturing same
WO2018210416A1 (en) * 2017-05-17 2018-11-22 Federal-Mogul Valvetrain Gmbh Poppet valve and method for production thereof
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US12292121B2 (en) 2023-08-10 2025-05-06 Vulcan Industrial Holdings, LLC Valve member including cavity, and related assemblies, systems, and methods

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075999A (en) * 1975-06-09 1978-02-28 Eaton Corporation Hard facing alloy for engine valves and the like
US4122817A (en) * 1975-05-01 1978-10-31 Trw Inc. Internal combustion valve having an iron based hard-facing alloy contact surface
JPS60122206A (ja) * 1983-12-06 1985-06-29 Mitsui Eng & Shipbuild Co Ltd 内燃機関の弁
US4530322A (en) * 1980-10-31 1985-07-23 Nippon Kokan Kabushiki Kaisha Exhaust valve for diesel engine and production thereof
US6244234B1 (en) * 1996-06-07 2001-06-12 Man B&W Diesel A/S Exhaust valve for an internal combustion engine
US6298817B1 (en) * 1996-06-07 2001-10-09 Man B&W Diesel A/S Exhaust valve for an internal combustion engine
US6378543B1 (en) * 1999-02-12 2002-04-30 Nittan Valve Co., Ltd. Hollow poppet valve and the method for manufacturing the same
US20020064678A1 (en) * 2000-08-28 2002-05-30 Yoshihisa Kiyotoki Corrosion-resisting and wear-resisting alloy and device using the same
US7562647B2 (en) * 2006-03-29 2009-07-21 High Performance Coatings, Inc. Inlet valve having high temperature coating and internal combustion engines incorporating same

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2392152A (en) * 1942-01-24 1946-01-01 Thompson Prod Inc Method of cold working hollow headed articles
FR1531687A (fr) * 1967-05-25 1968-07-05 Semt Perfectionnements aux soupapes
US3649380A (en) * 1969-04-14 1972-03-14 Trw Inc Method of manufacturing hard faced exhaust valves
US4161414A (en) * 1977-02-10 1979-07-17 Saint Prix Robert Process for fabricating fluid-control members for internal-combustion engines and the like
JPS60122207A (ja) * 1983-12-05 1985-06-29 Mitsui Eng & Shipbuild Co Ltd 内燃機関の排気部構造
DE3517077C1 (de) 1985-05-11 1986-11-06 M.A.N.- B & W Diesel GmbH, 8900 Augsburg Verfahren zum Panzern der Ventilsitzflaeche eines thermisch und mechanisch hoch belastbaren sowie gegen Korrosion geschuetzten Gaswechselventils fuer eine schweroelbetriebene Brennkraftmaschine
DK0521821T3 (da) * 1991-07-04 1996-08-26 New Sulzer Diesel Ag Udstødningsventil til en dieselforbrændingsmotor og fremgangsmåde til fremstilling af ventilen
US5233366A (en) * 1992-05-26 1993-08-03 Xerox Corporation Half-tone printing with thermal ink jet using random spot distribution in one dimension
JPH09256821A (ja) * 1996-03-19 1997-09-30 Aisan Ind Co Ltd エンジンバルブ
DK173136B1 (da) * 1996-05-15 2000-02-07 Man B & W Diesel As Bevægeligt vægelement i form af en udstødsventilspindel eller et stempel i en forbrændingsmotor.
EP0859131A1 (en) * 1997-02-14 1998-08-19 Fuji Oozx Inc. Poppet valve and method of making it
CN1191950A (zh) * 1997-02-25 1998-09-02 富士乌兹克斯株式会社 提升阀及其制造方法
JPH11270320A (ja) * 1998-03-20 1999-10-05 Nittan Valve Co Ltd 内燃機関用バルブの製法及びその製法により成形されたバルブ
US6295731B1 (en) * 1999-10-20 2001-10-02 Fuji Oozx Inc. Method of hardening a valve face of a poppet valve
US6385847B1 (en) 2000-09-13 2002-05-14 Eaton Corporation Seat faced engine valves and method of making seat faced engine valves
KR100981100B1 (ko) * 2005-11-15 2010-09-08 니탄 밸브 가부시키가이샤 냉매포함 중공 포펫 밸브 및 그 제조방법
DE102008018875A1 (de) * 2008-04-14 2009-10-15 Märkisches Werk GmbH Auslassventil an einem Hubkolbenmotor
DE102008054266A1 (de) 2008-10-31 2010-05-06 Mahle International Gmbh Beweglicher, heißen Gasen ausgesetzter Verschlusskörper eines Ventiles
JP5036879B2 (ja) * 2009-01-23 2012-09-26 マン・ディーゼル・アンド・ターボ，フィリアル・アフ・マン・ディーゼル・アンド・ターボ・エスイー，ティスクランド 内燃機関のための、排気弁スピンドルまたはピストンの形態にある可動壁部材、および当該部材を製造する方法
JP2011038438A (ja) * 2009-08-07 2011-02-24 Yamaha Motor Co Ltd 吸気バルブと、これを備えた内燃機関及び輸送機器
JP5420116B1 (ja) * 2012-06-14 2014-02-19 日鍛バルブ株式会社 ポペットバルブのフェース部の形成方法およびこの形成方法によるフェース部を有するポペットバルブ
DK177487B1 (en) * 2012-07-06 2013-07-15 Man Diesel & Turbo Deutschland An exhaust valve spindle for an exhaust valve in an internal combustion engine

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122817A (en) * 1975-05-01 1978-10-31 Trw Inc. Internal combustion valve having an iron based hard-facing alloy contact surface
US4075999A (en) * 1975-06-09 1978-02-28 Eaton Corporation Hard facing alloy for engine valves and the like
US4530322A (en) * 1980-10-31 1985-07-23 Nippon Kokan Kabushiki Kaisha Exhaust valve for diesel engine and production thereof
JPS60122206A (ja) * 1983-12-06 1985-06-29 Mitsui Eng & Shipbuild Co Ltd 内燃機関の弁
US6244234B1 (en) * 1996-06-07 2001-06-12 Man B&W Diesel A/S Exhaust valve for an internal combustion engine
US6298817B1 (en) * 1996-06-07 2001-10-09 Man B&W Diesel A/S Exhaust valve for an internal combustion engine
US6443115B1 (en) * 1996-06-07 2002-09-03 Man B&W Diesel A/S Exhaust valve for an internal combustion engine
US6378543B1 (en) * 1999-02-12 2002-04-30 Nittan Valve Co., Ltd. Hollow poppet valve and the method for manufacturing the same
US20020064678A1 (en) * 2000-08-28 2002-05-30 Yoshihisa Kiyotoki Corrosion-resisting and wear-resisting alloy and device using the same
US7562647B2 (en) * 2006-03-29 2009-07-21 High Performance Coatings, Inc. Inlet valve having high temperature coating and internal combustion engines incorporating same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230399961A1 (en) * 2020-10-21 2023-12-14 Nissan Motor Co., Ltd. , Cylinder head blank and cylinder head manufacturing method
US12276216B2 (en) * 2020-10-21 2025-04-15 Nissan Motor Co., Ltd. Cylinder head blank and cylinder head manufacturing method

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US10443456B2 (en) 2019-10-15
EP2933445A1 (en) 2015-10-21

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