CN104895695B - A kind of diesel engine cylinder head - Google Patents

A kind of diesel engine cylinder head Download PDF

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Publication number
CN104895695B
CN104895695B CN201510252100.8A CN201510252100A CN104895695B CN 104895695 B CN104895695 B CN 104895695B CN 201510252100 A CN201510252100 A CN 201510252100A CN 104895695 B CN104895695 B CN 104895695B
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China
Prior art keywords
exhaust valve
incubated
valve seat
cylinder head
diesel engine
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CN104895695A (en
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苏新斌
苏明
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Hongyuan Petroleum Equipment Ltd By Share Ltd
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Hongyuan Petroleum Equipment Ltd By Share Ltd
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Priority to CN201710708482.XA priority Critical patent/CN107514316A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • 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
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces
    • 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
    • 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
    • F01L3/04—Coated valve members or valve-seats
    • 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

Abstract

A kind of diesel engine cylinder head, cylinder head is included for the exhaust door part of diesel engine exhaust and the exhaust valve seat insert being engaged with exhaust door part, and exhaust valve seat insert chemical element composition is（Percentage by weight）：C:0.06 0.07 ﹪, Si：45 ﹪, Cr：23 ﹪, Zr：12 ﹪, Co：0.8 0.9 ﹪, Ni：0.2 0.3 ﹪, Nb：0.2 0.3 ﹪, B：0.1 0.2 ﹪, Al：0.07 0.08 ﹪, Ti：0.03 0.04 ﹪, Mn：0.02 0.03 ﹪, Mg：0.02 0.03 ﹪, Mo：0.01 0.02 ﹪, La：0.01 0.02 ﹪, surplus is Fe and inevitable impurity；By to engine valve applying coating, improving the anti-corrosion, high temperature resistant, anti-wear performance of material, exhaust valve seat insert carries out subzero treatment and improves its impact resistance and fatigue behaviour.

Description

A kind of diesel engine cylinder head
Technical field
The present invention relates to a kind of diesel engine cylinder head, belongs to automotive Diesel engine accessory technical field.
Background technology
Automobile inlet and exhaust valve and inlet and exhaust valve seat ring are the basic parts of cylinder, and the quality of its quality directly affects hair The main performance index such as motivation power and oil consumption, it is very big to the reliability effect of engine.Inlet and exhaust valve and inlet and exhaust valve seat ring Working environment it is severe, it not only bears high speed impact load, and to be worked under the conditions of with etchant gas, therefore hair Motivation inlet and exhaust valve and exhaust valve seat insert have become the consumable accessory for needing often to change, therefore improve valve and exhaust valve seat insert Use quality and life-span the problem of be one and need to solve.
The content of the invention
A kind of diesel engine cylinder head, cylinder head include for diesel engine exhaust exhaust door part and with exhaust The exhaust valve seat insert that door part is engaged,
Exhaust valve seat insert chemical element is constituted（Percentage by weight）：C:0.06-0.07 ﹪, Si：4-5 ﹪, Cr：2-3 ﹪, Zr：1-2 ﹪, Co：0.8-0.9 ﹪, Ni：0.2-0.3 ﹪, Nb：0.2-0.3 ﹪, B：0.1-0.2 ﹪, Al：0.07-0.08 ﹪, Ti：0.03-0.04 ﹪, Mn：0.02-0.03 ﹪, Mg：0.02-0.03 ﹪, Mo：0.01-0.02 ﹪, La：0.01-0.02 ﹪, it is remaining Measure as Fe and inevitable impurity；
Exhaust valve seat coil preparation method：Comprise the following steps：According to aforementioned proportion alloyage, raw material melting, cast take off After mould, obtained valve retainer base substrate feeding heating furnace is warming up to 900 DEG C, 75 DEG C/h of heating rate is incubated 3 hours, it Water hardening, heats base substrate and is incubated 5 hours at 620 DEG C, come out of the stove and be air-cooled to room temperature again afterwards；Base substrate is put into liquid nitrogen at deep cooling Reason 10 minutes, goes back up to room temperature in atmosphere；Base substrate is finely machined afterwards,
Alumina series coating is coated to the exhaust valve seat insert after fine machining；Aluminum oxide based materials layer includes（Weight Amount）：100-120 parts of aluminum oxide, 30-40 parts of titanium carbide, the valve retainer after coating is heated, and is warming up to 700 DEG C, heating 150 DEG C/h of speed, be incubated 8 hours, after be air-cooled to room temperature, obtain final exhaust valve seat insert,
Manufacture exhaust valve is concretely comprised the following steps：
Melting is carried out according to the elemental constituent of exhaust valve material of main part, is cast afterwards, obtains blank, exhaust valve material of main part For：C 0.13-0.27%, Si 3.4-4%, Mo 2-3%, W 1-2%, Mn 0.8-0.95%, P≤0.035%, S≤0.035%, Ti 2-3%, Cr 12-13%, Ni 2.8-3.24%, Co 1-1.2%, V 0.4-0.5%, surplus are Fe and inevitable impurity；
Blank is forged using electric upset forging, final forging temperature is 900 DEG C, and forging deformation amount is controlled in 65%-85%, jumping-up speed For 10mm/s；
Multistage quenching-and-tempering process is carried out after forging：The water quenching after 1050-1080 DEG C of insulation 10s, 450-500 DEG C is returned Fire；Then 980-1010 DEG C is incubated oil quenching after 10s, 430-440 DEG C of tempering；Oil quenching, 380- after last 950-970 DEG C of insulation 10s 410 DEG C of tempering；
Carried out after heat treatment to workpiece machining,
Carbo-nitriding heat treatment is carried out to workpiece surface after machining, process is oozed by force：950-980 DEG C of scope of temperature, carbon Gesture and nitrogen gesture take level Four step, and carbon potential 0.4-0.6%, nitrogen gesture 1.2-1.4% are incubated 3h, then raise carbon potential to 0.7-0.9%, Nitrogen gesture is reduced to 1.0-1.1%, 2h is incubated, then raises carbon potential to 1.0-1.1%, reduction nitrogen gesture to 0.7-0.9% is incubated 2h, finally Carbon potential is raised to 1.2-1.6%, reduction nitrogen gesture to 0.4-0.5% is incubated 2.5h；It is diffused after oozing by force, diffusion process：Control stove Temperature is down to 900-920 DEG C, is incubated 3h, is cooled to 820-850 DEG C, is incubated 4h, diffusion process carbon-potential control 1.2~1.3% it Between, nitrogen potential control is between 1.0~1.1%；It is air-cooled to room temperature；Quenched after diffusion, quenching process：Oil is carried out at 860 DEG C Quench, Oil-temperature control is at 75 DEG C；Cleaning process：Component surface oil stain is removed, rinse liquid temperature is controlled at 50 DEG C；Tempering：Carry out Lonneal, controls 185 DEG C of furnace temperature, time 150-200 minute.
Workpiece conical surface grinding is processed,
Conical surface built-up welding is carried out to workpiece after conical surface grinding processing, conical surface bead-welding technology is：150-200 DEG C of preheating, it is non-diverting Arc voltage 20V, untransferable arc electric current 50A；The Slow cooling after the completion of 10-12mm, welding of nozzle and workpiece surface；Built-up welding Layer material is：Co 30-35%, Mo 4-5%, Cr 1-2%, Ni 0.68-0.95%, B 0.2-0.3%, Ta 0.2-0.6%, Sn 0.5-0.6%, Gd 0.12-0.26%, C 0.05-0.13%, surplus is W；
Workpiece surface is polished
To workpiece surface shelling-out of titanium carbide coating, about 5-10 microns of coating layer thickness after workpiece surface polishing；Afterwards in carbonization The outer coated with titanium nitride coating of titanium coating, about 8-12 microns of coating layer thickness obtains exhaust valve.
A kind of described diesel engine cylinder head, exhaust valve seat insert chemical element, which is constituted, is（Percentage by weight）：C: 0.06 ﹪, Si：4 ﹪, Cr：2 ﹪, Zr：1 ﹪, Co：0.8 ﹪, Ni：0.2 ﹪, Nb：0.2 ﹪, B：0.1 ﹪, Al：0.07 ﹪, Ti： 0.03 ﹪, Mn：0.02 ﹪, Mg：0.02 ﹪, Mo：0.01 ﹪, La：0.01 ﹪, surplus is Fe and inevitable impurity.
A kind of described diesel engine cylinder head, exhaust valve seat insert chemical element, which is constituted, is（Percentage by weight）：C: 0.07 ﹪, Si：5 ﹪, Cr：3 ﹪, Zr：2 ﹪, Co：0.9 ﹪, Ni：0.3 ﹪, Nb：0.3 ﹪, B：0.2 ﹪, Al： 0.08 ﹪, Ti：0.04 ﹪, Mn：0.03 ﹪, Mg：0.03 ﹪, Mo：0.02 ﹪, La：0.02 ﹪, surplus is Fe and can not The impurity avoided.
A kind of described diesel engine cylinder head, exhaust valve seat insert chemical element, which is constituted, is（Percentage by weight）：C: 0.065 ﹪, Si：4.5 ﹪, Cr：2.5 ﹪, Zr：1.5 ﹪, Co：0.85 ﹪, Ni：0.25 ﹪, Nb：0.25 ﹪, B：0.15 ﹪, Al： 0.075 ﹪, Ti：0.035 ﹪, Mn：0.025 ﹪, Mg：0.025 ﹪, Mo：0.015 ﹪, La：0.015 ﹪, surplus is Fe and can not The impurity avoided.
A kind of described diesel engine cylinder head, exhaust valve material of main part is：C 0.13%, Si 3.4%, Mo 2%, W 1%, Mn 0.8%, P≤0.035%, S≤0.035%, Ti 2%, Cr 12%, Ni 2.8%, Co 1%, V 0.4%, surplus be Fe and Inevitable impurity.
A kind of described diesel engine cylinder head, exhaust valve material of main part is：C 0.27%, Si 4%, Mo 3%, W 2%, Mn 0.95%, P≤0.035%, S≤0.035%, Ti 3%, Cr 13%, Ni 3.24%, Co 1.2%, V 0.5%, surplus be Fe and Inevitable impurity.
A kind of described diesel engine cylinder head, exhaust valve material of main part is：C 0.2%, Si 3.7%, Mo 2.5%, W 1.5%, Mn 0.9%, P≤0.035%, S≤0.035%, Ti 2.5%, Cr 12.5%, Ni 3%, Co 1.1%, V 0.45%, surplus For Fe and inevitable impurity.
A kind of described diesel engine cylinder head, weld overlay materials are：Co 30%, Mo 4%, Cr 1%, Ni 0.68%, B 0.2%, Ta 0.2%, Sn 0.5%, Gd 0.12%, C 0.05%, surplus is W.
A kind of described diesel engine cylinder head, weld overlay materials are：Co 35%, Mo 5%, Cr 2%, Ni 0.95%, B 0.3%, Ta 0.6%, Sn 0.6%, Gd 0.26%, C 0.13%, surplus is W.
A kind of described diesel engine cylinder head, weld overlay materials are：Co 33%, Mo 4.5%, Cr 1.5%, Ni 0.8%, B 0.25%, Ta 0.4%, Sn 0.55%, Gd 0.2%, C 0.1%, surplus is W.
Foregoing invention content is relative to the beneficial effect of prior art：1）Ferrous alloy material of the present invention can be abundant Meet the intensity requirement of engine valve material of main part；2）Carbo-nitriding heat treatment is carried out to engine valve and improves exhaust valve Hardness and intensity, it is to avoid hot spot occur； 3）By built-up welding handle cause the engine valve conical surface reach higher wearability and Impact resistance, corresponding fatigue behaviour is also improved；4）By the anti-corrosion, resistance to for engine valve applying coating, improving material High temperature, anti-wear performance.5）Exhaust valve seat insert carries out subzero treatment and improves its impact resistance and fatigue behaviour；5）Respectively to exhaust valve seat Circle and engine valve, which are coated two coatings of coating and cooperated, reaches the effect of small wear extent.
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now describe the present invention's in detail Embodiment.
Embodiment 1
A kind of diesel engine cylinder head, cylinder head include for diesel engine exhaust exhaust door part and with exhaust The exhaust valve seat insert that door part is engaged,
Exhaust valve seat insert chemical element is constituted（Percentage by weight）：C:0.06 ﹪, Si：4 ﹪, Cr：2 ﹪, Zr：1 ﹪, Co：0.8 ﹪, Ni：0.2 ﹪, Nb：0.2 ﹪, B：0.1 ﹪, Al：0.07 ﹪, Ti：0.03 ﹪, Mn：0.02 ﹪, Mg：0.02 ﹪, Mo：0.01 ﹪, La：0.01 ﹪, surplus is Fe and inevitable impurity；
Exhaust valve seat coil preparation method：Comprise the following steps：According to aforementioned proportion alloyage, raw material melting, cast take off After mould, obtained valve retainer base substrate feeding heating furnace is warming up to 900 DEG C, 75 DEG C/h of heating rate is incubated 3 hours, it Water hardening, heats base substrate and is incubated 5 hours at 620 DEG C, come out of the stove and be air-cooled to room temperature again afterwards；Base substrate is put into liquid nitrogen at deep cooling Reason 10 minutes, goes back up to room temperature in atmosphere；Base substrate is finely machined afterwards,
Alumina series coating is coated to the exhaust valve seat insert after fine machining；Aluminum oxide based materials layer includes（Weight Amount）：100 parts of aluminum oxide, 30 parts of titanium carbide, the valve retainer after coating is heated, and is warming up to 700 DEG C, heating rate 150 DEG C/h, be incubated 8 hours, after be air-cooled to room temperature, obtain final exhaust valve seat insert,
Manufacture exhaust valve is concretely comprised the following steps：
Melting is carried out according to the elemental constituent of exhaust valve material of main part, is cast afterwards, obtains blank, exhaust valve material of main part For：C 0.13%, Si 3.4%, Mo 2%, W 1%, Mn 0.8%, P≤0.035%, S≤0.035%, Ti 2%, Cr 12%, Ni 2.8%, Co 1%, V 0.4%, surplus is Fe and inevitable impurity；
Blank is forged using electric upset forging, final forging temperature is 900 DEG C, and forging deformation amount is controlled in 65%-85%, jumping-up speed For 10mm/s；
Multistage quenching-and-tempering process is carried out after forging：The water quenching after 1050 DEG C of insulation 10s, 450 DEG C of tempering；Then 980 DEG C insulation 10s after oil quenching, 430 DEG C tempering；Oil quenching, 380 DEG C of tempering after last 950 DEG C of insulations 10s；
Carried out after heat treatment to workpiece machining,
Carbo-nitriding heat treatment is carried out to workpiece surface after machining, process is oozed by force：950-980 DEG C of scope of temperature, carbon Gesture and nitrogen gesture take level Four step, and carbon potential 0.4-0.6%, nitrogen gesture 1.2-1.4% are incubated 3h, then raise carbon potential to 0.7-0.9%, Nitrogen gesture is reduced to 1.0-1.1%, 2h is incubated, then raises carbon potential to 1.0-1.1%, reduction nitrogen gesture to 0.7-0.9% is incubated 2h, finally Carbon potential is raised to 1.2-1.6%, reduction nitrogen gesture to 0.4-0.5% is incubated 2.5h；It is diffused after oozing by force, diffusion process：Control stove Temperature is down to 900-920 DEG C, is incubated 3h, is cooled to 820-850 DEG C, is incubated 4h, diffusion process carbon-potential control 1.2~1.3% it Between, nitrogen potential control is between 1.0~1.1%；It is air-cooled to room temperature；Quenched after diffusion, quenching process：Oil is carried out at 860 DEG C Quench, Oil-temperature control is at 75 DEG C；Cleaning process：Component surface oil stain is removed, rinse liquid temperature is controlled at 50 DEG C；Tempering：Carry out Lonneal, controls 185 DEG C of furnace temperature, time 150-200 minute.
Workpiece conical surface grinding is processed,
Conical surface built-up welding is carried out to workpiece after conical surface grinding processing, conical surface bead-welding technology is：150-200 DEG C of preheating, it is non-diverting Arc voltage 20V, untransferable arc electric current 50A；The Slow cooling after the completion of 10-12mm, welding of nozzle and workpiece surface；Built-up welding Layer material is：Co 30%, Mo 4%, Cr 1%, Ni 0.68%, B 0.2%, Ta 0.2%, Sn 0.5%, Gd 0.12%, C 0.05%, surplus is W；
Workpiece surface is polished
To workpiece surface shelling-out of titanium carbide coating, about 5 microns of coating layer thickness after workpiece surface polishing；Applied afterwards in titanium carbide The outer coated with titanium nitride coating of layer, about 8 microns of coating layer thickness obtains exhaust valve.
Embodiment 2
A kind of diesel engine cylinder head, cylinder head include for diesel engine exhaust exhaust door part and with exhaust The exhaust valve seat insert that door part is engaged,
Exhaust valve seat insert chemical element is constituted（Percentage by weight）：C:0.07 ﹪, Si：5 ﹪, Cr：3 ﹪, Zr： 2 ﹪, Co：0.9 ﹪, Ni：0.3 ﹪, Nb：0.3 ﹪, B：0.2 ﹪, Al：0.08 ﹪, Ti：0.04 ﹪, Mn：0.03 ﹪, Mg：0.03 ﹪, Mo：0.02 ﹪, La：0.02 ﹪, surplus is Fe and inevitable impurity；
Exhaust valve seat coil preparation method：Comprise the following steps：According to aforementioned proportion alloyage, raw material melting, cast take off After mould, obtained valve retainer base substrate feeding heating furnace is warming up to 900 DEG C, 75 DEG C/h of heating rate is incubated 3 hours, it Water hardening, heats base substrate and is incubated 5 hours at 620 DEG C, come out of the stove and be air-cooled to room temperature again afterwards；Base substrate is put into liquid nitrogen at deep cooling Reason 10 minutes, goes back up to room temperature in atmosphere；Base substrate is finely machined afterwards,
Alumina series coating is coated to the exhaust valve seat insert after fine machining；Aluminum oxide based materials layer includes（Weight Amount）：120 parts of aluminum oxide, 40 parts of titanium carbide, the valve retainer after coating is heated, and is warming up to 700 DEG C, heating rate 150 DEG C/h, be incubated 8 hours, after be air-cooled to room temperature, obtain final exhaust valve seat insert,
Manufacture exhaust valve is concretely comprised the following steps：
Melting is carried out according to the elemental constituent of exhaust valve material of main part, is cast afterwards, obtains blank, exhaust valve material of main part For：C 0.27%, Si 4%, Mo 3%, W 2%, Mn 0.95%, P≤0.035%, S≤0.035%, Ti 3%, Cr 13%, Ni 3.24%, Co 1.2%, V 0.5%, surplus is Fe and inevitable impurity；
Blank is forged using electric upset forging, final forging temperature is 900 DEG C, and forging deformation amount is controlled in 65%-85%, jumping-up speed For 10mm/s；
Multistage quenching-and-tempering process is carried out after forging：The water quenching after 1080 DEG C of insulation 10s, 500 DEG C of tempering；Then Oil quenching after 1010 DEG C of insulation 10s, 440 DEG C of tempering；Oil quenching, 410 DEG C of tempering after last 970 DEG C of insulations 10s；
Carried out after heat treatment to workpiece machining,
Carbo-nitriding heat treatment is carried out to workpiece surface after machining, process is oozed by force：950-980 DEG C of scope of temperature, carbon Gesture and nitrogen gesture take level Four step, and carbon potential 0.4-0.6%, nitrogen gesture 1.2-1.4% are incubated 3h, then raise carbon potential to 0.7-0.9%, Nitrogen gesture is reduced to 1.0-1.1%, 2h is incubated, then raises carbon potential to 1.0-1.1%, reduction nitrogen gesture to 0.7-0.9% is incubated 2h, finally Carbon potential is raised to 1.2-1.6%, reduction nitrogen gesture to 0.4-0.5% is incubated 2.5h；It is diffused after oozing by force, diffusion process：Control stove Temperature is down to 900-920 DEG C, is incubated 3h, is cooled to 820-850 DEG C, is incubated 4h, diffusion process carbon-potential control 1.2~1.3% it Between, nitrogen potential control is between 1.0~1.1%；It is air-cooled to room temperature；Quenched after diffusion, quenching process：Oil is carried out at 860 DEG C Quench, Oil-temperature control is at 75 DEG C；Cleaning process：Component surface oil stain is removed, rinse liquid temperature is controlled at 50 DEG C；Tempering：Carry out Lonneal, controls 185 DEG C of furnace temperature, time 150-200 minute.
Workpiece conical surface grinding is processed,
Conical surface built-up welding is carried out to workpiece after conical surface grinding processing, conical surface bead-welding technology is：150-200 DEG C of preheating, it is non-diverting Arc voltage 20V, untransferable arc electric current 50A；The Slow cooling after the completion of 10-12mm, welding of nozzle and workpiece surface；Built-up welding Layer material is：Co 35%, Mo 5%, Cr 2%, Ni 0.95%, B 0.3%, Ta 0.6%, Sn 0.6%, Gd 0.26%, C 0.13%, surplus is W；
Workpiece surface is polished
To workpiece surface shelling-out of titanium carbide coating, about 10 microns of coating layer thickness after workpiece surface polishing；Afterwards in titanium carbide The outer coated with titanium nitride coating of coating, about 12 microns of coating layer thickness obtains exhaust valve.
Embodiment 3
A kind of diesel engine cylinder head, cylinder head include for diesel engine exhaust exhaust door part and with exhaust The exhaust valve seat insert that door part is engaged,
Exhaust valve seat insert chemical element is constituted（Percentage by weight）：C:0.065 ﹪, Si：4.5 ﹪, Cr：2.5 ﹪, Zr： 1.5 ﹪, Co：0.85 ﹪, Ni：0.25 ﹪, Nb：0.25 ﹪, B：0.15 ﹪, Al：0.075 ﹪, Ti：0.035 ﹪, Mn： 0.025 ﹪, Mg：0.025 ﹪, Mo：0.015 ﹪, La：0.015 ﹪, surplus is Fe and inevitable impurity；
Exhaust valve seat coil preparation method：Comprise the following steps：According to aforementioned proportion alloyage, raw material melting, cast take off After mould, obtained valve retainer base substrate feeding heating furnace is warming up to 900 DEG C, 75 DEG C/h of heating rate is incubated 3 hours, it Water hardening, heats base substrate and is incubated 5 hours at 620 DEG C, come out of the stove and be air-cooled to room temperature again afterwards；Base substrate is put into liquid nitrogen at deep cooling Reason 10 minutes, goes back up to room temperature in atmosphere；Base substrate is finely machined afterwards,
Alumina series coating is coated to the exhaust valve seat insert after fine machining；Aluminum oxide based materials layer includes（Weight Amount）：110 parts of aluminum oxide, 35 parts of titanium carbide, the valve retainer after coating is heated, and is warming up to 700 DEG C, heating rate 150 DEG C/h, be incubated 8 hours, after be air-cooled to room temperature, obtain final exhaust valve seat insert,
Manufacture exhaust valve is concretely comprised the following steps：
Melting is carried out according to the elemental constituent of exhaust valve material of main part, is cast afterwards, obtains blank, exhaust valve material of main part For：C 0.2%, Si 3.7%, Mo 2.5%, W 1.5%, Mn 0.9%, P≤0.035%, S≤0.035%, Ti 2.5%, Cr 12.5%, Ni 3%, Co 1.1%, V 0.45%, surplus is Fe and inevitable impurity；
Blank is forged using electric upset forging, final forging temperature is 900 DEG C, and forging deformation amount is controlled in 65%-85%, jumping-up speed For 10mm/s；
Multistage quenching-and-tempering process is carried out after forging：The water quenching after 1070 DEG C of insulation 10s, 470 DEG C of tempering；Then 990 DEG C insulation 10s after oil quenching, 435 DEG C tempering；Oil quenching, 390 DEG C of tempering after last 960 DEG C of insulations 10s；
Carried out after heat treatment to workpiece machining,
Carbo-nitriding heat treatment is carried out to workpiece surface after machining, process is oozed by force：950-980 DEG C of scope of temperature, carbon Gesture and nitrogen gesture take level Four step, and carbon potential 0.4-0.6%, nitrogen gesture 1.2-1.4% are incubated 3h, then raise carbon potential to 0.7-0.9%, Nitrogen gesture is reduced to 1.0-1.1%, 2h is incubated, then raises carbon potential to 1.0-1.1%, reduction nitrogen gesture to 0.7-0.9% is incubated 2h, finally Carbon potential is raised to 1.2-1.6%, reduction nitrogen gesture to 0.4-0.5% is incubated 2.5h；It is diffused after oozing by force, diffusion process：Control stove Temperature is down to 900-920 DEG C, is incubated 3h, is cooled to 820-850 DEG C, is incubated 4h, diffusion process carbon-potential control 1.2~1.3% it Between, nitrogen potential control is between 1.0~1.1%；It is air-cooled to room temperature；Quenched after diffusion, quenching process：Oil is carried out at 860 DEG C Quench, Oil-temperature control is at 75 DEG C；Cleaning process：Component surface oil stain is removed, rinse liquid temperature is controlled at 50 DEG C；Tempering：Carry out Lonneal, controls 185 DEG C of furnace temperature, time 150-200 minute.
Workpiece conical surface grinding is processed,
Conical surface built-up welding is carried out to workpiece after conical surface grinding processing, conical surface bead-welding technology is：150-200 DEG C of preheating, it is non-diverting Arc voltage 20V, untransferable arc electric current 50A；The Slow cooling after the completion of 10-12mm, welding of nozzle and workpiece surface；Built-up welding Layer material is：Co 33%, Mo 4.5%, Cr 1.5%, Ni 0.8%, B 0.25%, Ta 0.4%, Sn 0.55%, Gd 0.2%, C 0.1%, surplus is W；
Workpiece surface is polished
To workpiece surface shelling-out of titanium carbide coating, about 7 microns of coating layer thickness after workpiece surface polishing；Applied afterwards in titanium carbide The outer coated with titanium nitride coating of layer, about 10 microns of coating layer thickness obtains exhaust valve.
Embodiment 4
A kind of diesel engine cylinder head, cylinder head include for diesel engine exhaust exhaust door part and with exhaust The exhaust valve seat insert that door part is engaged,
Exhaust valve seat insert chemical element is constituted（Percentage by weight）：C:0.063 ﹪, Si：4.2 ﹪, Cr：2.1 ﹪, Zr： 1.4 ﹪, Co：0.84 ﹪, Ni：0.23 ﹪, Nb：0.22 ﹪, B：0.11 ﹪, Al：0.074 ﹪, Ti：0.034 ﹪, Mn： 0.022 ﹪, Mg：0.023 ﹪, Mo：0.012 ﹪, La：0.013 ﹪, surplus is Fe and inevitable impurity；
Exhaust valve seat coil preparation method：Comprise the following steps：According to aforementioned proportion alloyage, raw material melting, cast take off After mould, obtained valve retainer base substrate feeding heating furnace is warming up to 900 DEG C, 75 DEG C/h of heating rate is incubated 3 hours, it Water hardening, heats base substrate and is incubated 5 hours at 620 DEG C, come out of the stove and be air-cooled to room temperature again afterwards；Base substrate is put into liquid nitrogen at deep cooling Reason 10 minutes, goes back up to room temperature in atmosphere；Base substrate is finely machined afterwards,
Alumina series coating is coated to the exhaust valve seat insert after fine machining；Aluminum oxide based materials layer includes（Weight Amount）：102 parts of aluminum oxide, 33 parts of titanium carbide, the valve retainer after coating is heated, and is warming up to 700 DEG C, heating rate 150 DEG C/h, be incubated 8 hours, after be air-cooled to room temperature, obtain final exhaust valve seat insert,
Manufacture exhaust valve is concretely comprised the following steps：
Melting is carried out according to the elemental constituent of exhaust valve material of main part, is cast afterwards, obtains blank, exhaust valve material of main part For：C 0.15%, Si 3.5%, Mo 2.3%, W 1.3%, Mn 0.83%, P≤0.035%, S≤0.035%, Ti 2.1%, Cr 12.3%, Ni 2.9%, Co 1.04%, V 0.43%, surplus is Fe and inevitable impurity；
Blank is forged using electric upset forging, final forging temperature is 900 DEG C, and forging deformation amount is controlled in 65%-85%, jumping-up speed For 10mm/s；
Multistage quenching-and-tempering process is carried out after forging：The water quenching after 1053 DEG C of insulation 10s, 455 DEG C of tempering；Then 985 DEG C insulation 10s after oil quenching, 433 DEG C tempering；Oil quenching, 384 DEG C of tempering after last 954 DEG C of insulations 10s；
Carried out after heat treatment to workpiece machining,
Carbo-nitriding heat treatment is carried out to workpiece surface after machining, process is oozed by force：950-980 DEG C of scope of temperature, carbon Gesture and nitrogen gesture take level Four step, and carbon potential 0.4-0.6%, nitrogen gesture 1.2-1.4% are incubated 3h, then raise carbon potential to 0.7-0.9%, Nitrogen gesture is reduced to 1.0-1.1%, 2h is incubated, then raises carbon potential to 1.0-1.1%, reduction nitrogen gesture to 0.7-0.9% is incubated 2h, finally Carbon potential is raised to 1.2-1.6%, reduction nitrogen gesture to 0.4-0.5% is incubated 2.5h；It is diffused after oozing by force, diffusion process：Control stove Temperature is down to 900-920 DEG C, is incubated 3h, is cooled to 820-850 DEG C, is incubated 4h, diffusion process carbon-potential control 1.2~1.3% it Between, nitrogen potential control is between 1.0~1.1%；It is air-cooled to room temperature；Quenched after diffusion, quenching process：Oil is carried out at 860 DEG C Quench, Oil-temperature control is at 75 DEG C；Cleaning process：Component surface oil stain is removed, rinse liquid temperature is controlled at 50 DEG C；Tempering：Carry out Lonneal, controls 185 DEG C of furnace temperature, time 150-200 minute.
Workpiece conical surface grinding is processed,
Conical surface built-up welding is carried out to workpiece after conical surface grinding processing, conical surface bead-welding technology is：150-200 DEG C of preheating, it is non-diverting Arc voltage 20V, untransferable arc electric current 50A；The Slow cooling after the completion of 10-12mm, welding of nozzle and workpiece surface；Built-up welding Layer material is：Co 31%, Mo 4.2%, Cr 1.3%, Ni 0.69%, B 0.23%, Ta 0.24%, Sn 0.52%, Gd 0.14%, C 0.07%, surplus is W；
Workpiece surface is polished
To workpiece surface shelling-out of titanium carbide coating, about 6 microns of coating layer thickness after workpiece surface polishing；Applied afterwards in titanium carbide The outer coated with titanium nitride coating of layer, about 9 microns of coating layer thickness obtains exhaust valve.
Embodiment 5
A kind of diesel engine cylinder head, cylinder head include for diesel engine exhaust exhaust door part and with exhaust The exhaust valve seat insert that door part is engaged,
Exhaust valve seat insert chemical element is constituted（Percentage by weight）：C:0.068 ﹪, Si：4.7 ﹪, Cr：2.7 ﹪, Zr： 1.8 ﹪, Co：0.86 ﹪, Ni：0.29 ﹪, Nb：0.28 ﹪, B：0.18 ﹪, Al：0.077 ﹪, Ti：0.036 ﹪, Mn： 0.026 ﹪, Mg：0.027 ﹪, Mo：0.018 ﹪, La：0.019 ﹪, surplus is Fe and inevitable impurity；
Exhaust valve seat coil preparation method：Comprise the following steps：According to aforementioned proportion alloyage, raw material melting, cast take off After mould, obtained valve retainer base substrate feeding heating furnace is warming up to 900 DEG C, 75 DEG C/h of heating rate is incubated 3 hours, it Water hardening, heats base substrate and is incubated 5 hours at 620 DEG C, come out of the stove and be air-cooled to room temperature again afterwards；Base substrate is put into liquid nitrogen at deep cooling Reason 10 minutes, goes back up to room temperature in atmosphere；Base substrate is finely machined afterwards,
Alumina series coating is coated to the exhaust valve seat insert after fine machining；Aluminum oxide based materials layer includes（Weight Amount）：118 parts of aluminum oxide, 38 parts of titanium carbide, the valve retainer after coating is heated, and is warming up to 700 DEG C, heating rate 150 DEG C/h, be incubated 8 hours, after be air-cooled to room temperature, obtain final exhaust valve seat insert,
Manufacture exhaust valve is concretely comprised the following steps：
Melting is carried out according to the elemental constituent of exhaust valve material of main part, is cast afterwards, obtains blank, exhaust valve material of main part For：C 0.25%, Si 3.9%, Mo 2.8%, W 1.7%, Mn 0.93%, P≤0.035%, S≤0.035%, Ti 2.8%, Cr 12.7%, Ni 3.1%, Co 1.16%, V 0.48%, surplus is Fe and inevitable impurity；
Blank is forged using electric upset forging, final forging temperature is 900 DEG C, and forging deformation amount is controlled in 65%-85%, jumping-up speed For 10mm/s；
Multistage quenching-and-tempering process is carried out after forging：The water quenching after 1070 DEG C of insulation 10s, 495 DEG C of tempering；Then 1005 DEG C insulation 10s after oil quenching, 437 DEG C tempering；Oil quenching, 406 DEG C of tempering after last 967 DEG C of insulations 10s；
Carried out after heat treatment to workpiece machining,
Carbo-nitriding heat treatment is carried out to workpiece surface after machining, process is oozed by force：950-980 DEG C of scope of temperature, carbon Gesture and nitrogen gesture take level Four step, and carbon potential 0.4-0.6%, nitrogen gesture 1.2-1.4% are incubated 3h, then raise carbon potential to 0.7-0.9%, Nitrogen gesture is reduced to 1.0-1.1%, 2h is incubated, then raises carbon potential to 1.0-1.1%, reduction nitrogen gesture to 0.7-0.9% is incubated 2h, finally Carbon potential is raised to 1.2-1.6%, reduction nitrogen gesture to 0.4-0.5% is incubated 2.5h；It is diffused after oozing by force, diffusion process：Control stove Temperature is down to 900-920 DEG C, is incubated 3h, is cooled to 820-850 DEG C, is incubated 4h, diffusion process carbon-potential control 1.2~1.3% it Between, nitrogen potential control is between 1.0~1.1%；It is air-cooled to room temperature；Quenched after diffusion, quenching process：Oil is carried out at 860 DEG C Quench, Oil-temperature control is at 75 DEG C；Cleaning process：Component surface oil stain is removed, rinse liquid temperature is controlled at 50 DEG C；Tempering：Carry out Lonneal, controls 185 DEG C of furnace temperature, time 150-200 minute.
Workpiece conical surface grinding is processed,
Conical surface built-up welding is carried out to workpiece after conical surface grinding processing, conical surface bead-welding technology is：150-200 DEG C of preheating, it is non-diverting Arc voltage 20V, untransferable arc electric current 50A；The Slow cooling after the completion of 10-12mm, welding of nozzle and workpiece surface；Built-up welding Layer material is：Co 34%, Mo 4.8%, Cr 1.6%, Ni 0.93%, B 0.27%, Ta 0.56%, Sn 0.57%, Gd 0.24%, C 0.11%, surplus is W；
Workpiece surface is polished
To workpiece surface shelling-out of titanium carbide coating, about 9 microns of coating layer thickness after workpiece surface polishing；Applied afterwards in titanium carbide The outer coated with titanium nitride coating of layer, about 11 microns of coating layer thickness obtains exhaust valve.

Claims (7)

1. a kind of diesel engine cylinder head, cylinder head includes the exhaust door part and and exhaust valve for diesel engine exhaust The exhaust valve seat insert that part is engaged,
Exhaust valve seat insert chemical element is constituted（Percentage by weight）：C:0.06-0.07 ﹪, Si：4-5 ﹪, Cr：2-3 ﹪, Zr： 1-2 ﹪, Co：0.8-0.9 ﹪, Ni：0.2-0.3 ﹪, Nb：0.2-0.3 ﹪, B：0.1-0.2 ﹪, Al：0.07-0.08 ﹪, Ti： 0.03-0.04 ﹪, Mn：0.02-0.03 ﹪, Mg：0.02-0.03 ﹪, Mo：0.01-0.02 ﹪, La：0.01-0.02 ﹪, surplus For Fe and inevitable impurity；
Exhaust valve seat coil preparation method：Comprise the following steps：According to aforementioned proportion alloyage, raw material melting, cast, the demoulding Afterwards, the valve retainer base substrate feeding heating furnace obtained, is warming up to 900 DEG C, 75 DEG C/h of heating rate is incubated 3 hours, afterwards Water hardening, heats base substrate and is incubated 5 hours at 620 DEG C, come out of the stove and be air-cooled to room temperature again；Base substrate is put into subzero treatment in liquid nitrogen 10 minutes, room temperature was gone back up in atmosphere；Base substrate is finely machined afterwards,
Alumina series coating is coated to the exhaust valve seat insert after fine machining；Aluminum oxide based materials layer includes（Weight）： 100-120 parts of aluminum oxide, 30-40 parts of titanium carbide, the valve retainer after coating is heated, and is warming up to 700 DEG C, heating rate 150 DEG C/h, be incubated 8 hours, after be air-cooled to room temperature, obtain final exhaust valve seat insert,
Manufacture exhaust valve is concretely comprised the following steps：
Melting is carried out according to the elemental constituent of exhaust valve material of main part, is cast afterwards, obtains blank, exhaust valve material of main part is：C 0.13-0.27%, Si 3.4-4%, Mo 2-3%, W 1-2%, Mn 0.8-0.95%, P≤0.035%, S≤0.035%, Ti 2-3%, Cr 12-13%, Ni 2.8-3.24%, Co 1-1.2%, V 0.4-0.5%, surplus is Fe and inevitable impurity；
Blank is forged using electric upset forging, final forging temperature is 900 DEG C, and forging deformation amount is controlled in 65%-85%, and jumping-up speed is 10mm/s；
Multistage quenching-and-tempering process is carried out after forging：The water quenching after 1050-1080 DEG C of insulation 10s, 450-500 DEG C of tempering；So 980-1010 DEG C is incubated oil quenching after 10s, 430-440 DEG C of tempering afterwards；Oil quenching, 380-410 DEG C after last 950-970 DEG C of insulation 10s Tempering；
Carried out after heat treatment to workpiece machining,
Carbo-nitriding heat treatment is carried out to workpiece surface after machining, process is oozed by force：950-980 DEG C of scope of temperature, carbon potential and Nitrogen gesture takes level Four step, and carbon potential 0.4-0.6%, nitrogen gesture 1.2-1.4% are incubated 3h, then raises carbon potential to 0.7-0.9%, reduction Nitrogen gesture is incubated 2h to 1.0-1.1%, then raises carbon potential to 1.0-1.1%, and reduction nitrogen gesture to 0.7-0.9% is incubated 2h, finally raised Carbon potential to 1.2-1.6%, reduction nitrogen gesture to 0.4-0.5% is incubated 2.5h；It is diffused after oozing by force, diffusion process：Control furnace temperature Be down to 900-920 DEG C, be incubated 3h, be cooled to 820-850 DEG C, be incubated 4h, diffusion process carbon-potential control between 1.2~1.3%, Nitrogen potential control is between 1.0~1.1%；It is air-cooled to room temperature；Quenched after diffusion, quenching process：Oil quenching, oil are carried out at 860 DEG C Temperature control system is at 75 DEG C；Cleaning process：Component surface oil stain is removed, rinse liquid temperature is controlled at 50 DEG C；Tempering：Low temperature is carried out to return Fire, 185 DEG C of furnace temperature of control, time 150-200 minute,
Workpiece conical surface grinding is processed,
Conical surface built-up welding is carried out to workpiece after conical surface grinding processing, conical surface bead-welding technology is：150-200 DEG C of preheating, untransferable arc electricity Press 20V, untransferable arc electric current 50A；The Slow cooling after the completion of 10-12mm, welding of nozzle and workpiece surface；Overlay cladding material Expect be：Co 30-35%, Mo 4-5%, Cr 1-2%, Ni 0.68-0.95%, B 0.2-0.3%, Ta 0.2-0.6%, Sn 0.5- 0.6%, Gd 0.12-0.26%, C 0.05-0.13%, surplus is W；
Workpiece surface is polished,
To workpiece surface shelling-out of titanium carbide coating, 5-10 microns of coating layer thickness after workpiece surface polishing；Afterwards in titanium carbide coating Outer coated with titanium nitride coating, 8-12 microns of coating layer thickness, obtains exhaust valve.
2. a kind of diesel engine cylinder head as claimed in claim 1, exhaust valve seat insert chemical element, which is constituted, is（Weight percent Than）：C:0.06 ﹪, Si：4 ﹪, Cr：2 ﹪, Zr：1 ﹪, Co：0.8 ﹪, Ni：0.2 ﹪, Nb：0.2 ﹪, B：0.1 ﹪, Al： 0.07 ﹪, Ti：0.03 ﹪, Mn：0.02 ﹪, Mg：0.02 ﹪, Mo：0.01 ﹪, La：0.01 ﹪, surplus is Fe and inevitable Impurity.
3. a kind of diesel engine cylinder head as claimed in claim 1, exhaust valve seat insert chemical element, which is constituted, is（Weight percent Than）：C:0.07 ﹪, Si：5 ﹪, Cr：3 ﹪, Zr：2 ﹪, Co：0.9 ﹪, Ni：0.3 ﹪, Nb：0.3 ﹪, B：0.2 ﹪, Al：0.08 ﹪, Ti：0.04 ﹪, Mn：0.03 ﹪, Mg：0.03 ﹪, Mo：0.02 ﹪, La：0.02 ﹪, surplus be Fe and Inevitable impurity.
4. a kind of diesel engine cylinder head as claimed in claim 1, exhaust valve seat insert chemical element, which is constituted, is（Weight percent Than）：C:0.065 ﹪, Si：4.5 ﹪, Cr：2.5 ﹪, Zr：1.5 ﹪, Co：0.85 ﹪, Ni：0.25 ﹪, Nb：0.25 ﹪, B： 0.15 ﹪, Al：0.075 ﹪, Ti：0.035 ﹪, Mn：0.025 ﹪, Mg：0.025 ﹪, Mo：0.015 ﹪, La：0.015 ﹪, surplus For Fe and inevitable impurity.
5. a kind of diesel engine cylinder head as claimed in claim 1, exhaust valve material of main part is：C 0.13%, Si 3.4%, Mo 2%, W 1%, Mn 0.8%, P≤0.035%, S≤0.035%, Ti 2%, Cr 12%, Ni 2.8%, Co 1%, V 0.4%, it is remaining Measure as Fe and inevitable impurity.
6. a kind of diesel engine cylinder head as claimed in claim 1, exhaust valve material of main part is：C 0.27%, Si 4%, Mo 3%, W 2%, Mn 0.95%, P≤0.035%, S≤0.035%, Ti 3%, Cr 13%, Ni 3.24%, Co 1.2%, V 0.5%, it is remaining Measure as Fe and inevitable impurity.
7. a kind of diesel engine cylinder head as claimed in claim 1, exhaust valve material of main part is：C 0.2%, Si 3.7%, Mo 2.5%, W 1.5%, Mn 0.9%, P≤0.035%, S≤0.035%, Ti 2.5%, Cr 12.5%, Ni 3%, Co 1.1%, V 0.45%, surplus is Fe and inevitable impurity.
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CN108225780A (en) * 2017-12-18 2018-06-29 中国第汽车股份有限公司 A kind of engine valve retainer and temp measuring method
CN109611233A (en) * 2019-01-28 2019-04-12 广西玉柴机器股份有限公司 A kind of engine air cylinder head structure
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