CN105583589A - Machining forming and manufacturing technique for piston made of 38CrMnAl steel - Google Patents

Machining forming and manufacturing technique for piston made of 38CrMnAl steel Download PDF

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Publication number
CN105583589A
CN105583589A CN201410571128.3A CN201410571128A CN105583589A CN 105583589 A CN105583589 A CN 105583589A CN 201410571128 A CN201410571128 A CN 201410571128A CN 105583589 A CN105583589 A CN 105583589A
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piston
heated
treatment
steel
carried out
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张明
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Wuxi Huaye Iron & Steel Co Ltd
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Wuxi Huaye Iron & Steel Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
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Abstract

The invention discloses a machining forming and manufacturing technique for a piston made of 38CrMnAl steel and belongs to the comprehensive technical field of powder metallurgy and anti-corrosion treatment. The machining forming and manufacturing technique for the piston comprises the steps of normalizing treatment of a bar, manufacturing of a workblank through powder metallurgy, full annealing, machining, salt bath quenching, surface chemical treatment, surface chemical treatment, deposition treatment, polishing treatment and surface coating. The piston manufactured through the manufacturing technique does not deform under high-temperature and high-pressure conditions and is high in surface hardness, abrasion resistance, bend resistance and fatigue strength, good in core tenacity, long in service life and high in working reliability; due to the fact that the workblank is manufactured through powder metallurgy, the high-temperature resistance is good, the structure is more reasonable, the abrasion resistance is good, the mechanical performance is good, the sealing performance is good, and the corrosion resistance and the oxidation resistance are good.

Description

A kind of piston taking 38CrMnAl steel as material shape manufacturing process
Technical field
The method belongs to powder metallurgy and preservative treatment complex art field, relates to 38CrMnAl steel and work thereofPlug. Especially a kind of piston taking 38CrMnAl steel as material shape manufacture method.
Background technology
Existing piston is metal, real cored structure, because the working surface of axle is metal material, so long-timeBe operated in liquid environment, the surface of axle is as easy as rolling off a log to be worn and to corrode, and this situation affects piston greatlyOperating efficiency and product quality. The hydraulic piston cylinder that every profession and trade hydraulic test uses is generally reality with pistonHeart ferrous metal, cast-iron piston case hardness is low, not wear-resisting, between the operating period, easily occurs scratching on its surface;Along with scientific and technological progress, although adopt some etch-proof ways as at metal shaft surface spraying or coating materialExpect, but owing to only applying one deck nonmetallic materials in metal shaft performance, nonmetallic coating is to pass through sprayingMethod is coated in the surface of metal shaft, and so not only the nonmetallic materials of requirement spraying can not be blocked up, and non-Being connected insecure and departing between metal coating and metal shaft, axle is easy to nonmetal in workCoating is rubbed, so the anticorrosion of this axle and wear-resisting effect are unsatisfactory, what have even works one monthSecondary axes must be changed in left and right, and this increased labour intensity, increased again cost consumption, caused manpowerThe waste of material resources, has reduced operating efficiency. Existing piston generally leans on punching press one-shot forming, its piston body instituteLarge with material, cost is high. and particularly the piston after wearing and tearing needs integral replacing, therefore causes waste of material.Though spheroidal graphite cast-iron piston performance has certain improvement, also cannot deal with problems at all. The piston of several materials aboveAll there is Heavy Weight, the serious and high in cost of production shortcoming of waste of material.
Summary of the invention
For the deficiencies in the prior art, the present invention, in order to address the above problem, has designed a kind of with 38CrMnAlSteel be material piston shape manufacture method.
The present invention has designed a kind of manufacture method that shapes of the piston taking 38CrMnAl steel as material, this piston materialMaterial has mainly comprised the degree of time column element: Mn0.8%-1.1%, C0.2%-0.5%, Si1.5％-2.3％，Cr0.7％-1.2％，Al1.3％-1.8％,Mo0.12％-0.57％,Sn0.01％-0.56％，Ni < 0.003%, Ti < 0.02%, S < 0.03%, V0.01%-0.04%, all the other are iron and impurity thereof. Preferably Mn0.9％-1.0％，C0.3％-0.4％，Si1.6％-2.1％，Cr0.8％-1.1％，Al1.4％-1.6％,Mo0.18％-0.51％,Sn0.08％-0.51％，Ni<0.003％,Ti<0.02％,S<0.03％,V0.01％-0.04％,Adopt following processing technology: (1) carries out normalized treatment to the bar for base material, is heatedTo 990-1120 DEG C, insulation 2-3h makes organizing after complete austenitizing of steel evenly cooling in air,(2) bar after normalized treatment is injected to die cavity with injection machine, institute's plus-pressure is 27-32Mp, to pressingThe piston blank of making type carries out sintering, and sintering temperature is: 1150-1250 DEG C, sintering time is: 40-50Minute, sintering atmosphere is vacuum, passes into hydrogen and pressurization 6-8Mp, in the time that sintering finishes in airSlow cooling, (3) carry out destressing processing to piston blank, are heated 1000-1100 DEG C, insulation2-3h, Slow cooling to 500 DEG C in stove, more quick water-cooled, (4) to piston face carbo-nitriding processing,Workpiece is placed in to heated sealed stove and passes into the carburizers such as kerosene, temperature is heated to 800-860 DEG C and makes workPart oozes carbo-nitriding under this high temperature, and the piston after carbo-nitriding is carried out surface phosphoric acid processing by (5),Scale removal or defect, adopt anaerobic heating to carry out impression finish forge afterwards, and (6) will be through accurately machined workFill in row salt bath quenching, be incubated 2-4h after being heated 680-750 DEG C cooling fast in salt solution, then enterRow lonneal, temperature is: 150-250 DEG C, insulation 2-4h, air cooling, hardness is 58-60HRC,(7) piston after Quenching Treatment is carried out to deposition processes, piston is placed in the stove that is connected with ammonia, be heated to1000-1120 DEG C, taking hydrogen as carrier is by CH4Bring reactor into, TiC is deposited on to piston face, (8)Piston is carried out to surface finish processing, remove the residue that chemical treatment thing stays, (9) are to after polishingPiston carries out preservative treatment, by magnesia, silicate, and waterglass, water etc. are made into thick mixing material,After stirring, be applied to steel surface, coating layer thickness is 40-50 μ m, wherein, and the oxidation of 10%-20%Magnesium, the silicate cement of 15-25%, waterglass 10%, all the other are water, then steel are put in to 300-400 DEG CUnder carry out heated baking, make its surface form layer protecting film, reach antiseptic and rustproof object.
Advantage of the present invention, for first steel material being carried out to normalized treatment, makes to have adjusted the hardness of steel billet before base,Refinement tissue and net carbide eliminate and the piston dense structure that obtains by above-mentioned technique, wear-resistingDamage, lightweight, cost is low, can save a large amount of raw material, particularly to Large Piston save material particularly brightAobvious. Powder to configuration carries out annealing in process, has not only reduced the content of impurity, improves powder purity, withTime eliminated the work hardening of powder in process, improved the compressibility of powder. Gas nitrocarburizingWith surface deposition processing, make metal surface form one deck with ε-F2-3N and γ-Fe4N is main nitride layer, white layer, this groupKnit and there is very high hardness, play wear-resisting effect, tired slight and corrosion resistance. Produce on iron and steel material products surfaceA raw separation layer, really have pollution-free, simplify processing procedure and cost-effective feature, and isolation after treatmentLayer has preferably texture, to break through traditional chemical toxic raw materials or dyestuff to reach the mistake of Treatment of Metal SurfaceJourney is the new force method of a kind of desirable derusting rust-proofing.
Detailed description of the invention
Embodiment mono-
Designed a kind of manufacture method that shapes of piston, this piston material is 38CrMnAl steel, mainly bagDraw together following constituent content: Mn0.8%, C0.2%, Si1.5%, Cr0.7%%, Al1.3%, Mo0.12%, Sn0.01%, Ni < 0.003%, Ti < 0.02%, S < 0.03%, V0.01%-0.04%, all the other are iron and impurity thereof, adoptBy following processing technology: (1) carries out normalized treatment to the bar for base material, is heated to by it990 DEG C, insulation 2h makes organizing after complete austenitizing of steel evenly cooling in air, and (2) will be justFire bar after treatment injects die cavity with injection machine, and institute's plus-pressure is 27Mp, to compressing pistonBlank carries out sintering, and sintering temperature is: 1150 DEG C, sintering time is: 40 minutes, sintering atmosphere was vacuum,In the time that finishing, sintering passes into hydrogen and pressurization 6Mp, Slow cooling in air, and (3) are to piston blankCarry out destressing processing, be heated 1000 DEG C, insulation 2h, Slow cooling to 500 DEG C in stove, fasterSpeed water-cooled, (4), to piston face carbo-nitriding processing, are placed in heated sealed stove workpiece and pass into keroseneDeng carburizer, temperature is heated to 800 DEG C and makes workpiece ooze carbo-nitriding under this high temperature, (5) are by carbonPiston after nitrogen oozes altogether carries out surface phosphoric acid processing, scale removal or defect, adopt afterwards anaerobic heat intoRow impression finish forge, (6) will carry out salt bath quenching through accurately machined piston, be heated 680 DEG C after protect2h is cooling fast in salt solution for temperature, then carries out lonneal, and temperature is: 150 DEG C, and insulation 2h, skyCold, hardness is 58HRC, and (7) carry out deposition processes to the piston after Quenching Treatment, and piston is placed in and is connected withIn the stove of ammonia, be heated to 1000 DEG C, taking hydrogen as carrier is by CH4Bring reactor into, TiC is deposited onPiston face, (8) carry out surface finish processing to piston, remove the residue that chemical treatment thing stays, (9)Piston after polishing is carried out to preservative treatment, by magnesia, silicate, waterglass, water etc. are made into stickyThick shape mixing material, after stirring, is applied to steel surface, and coating layer thickness is 40 μ m, wherein, and 10%%Magnesia, 15% silicate cement, waterglass 10%, all the other are water, then steel are put in to 3000 DEG CUnder carry out heated baking, make its surface form layer protecting film.
Embodiment bis-
Designed a kind of manufacture method that shapes of piston, this piston material is 38CrMnAl steel, mainly bagDraw together following constituent content: Mn1.1%, C0.5%, Si2.3%, Cr1.2%, Al1.8%, Mo0.57%, Sn0.56%, Ni < 0.003%, Ti < 0.02%, S < 0.03%, V0.01%-0.04%, all the other are iron and impurity thereof, adoptBy following processing technology: (1) carries out normalized treatment to the bar for base material, is heated to by it1120 DEG C, insulation 3h makes organizing after complete austenitizing of steel evenly cooling in air, and (2) will be justFire bar after treatment injects die cavity with injection machine, and institute's plus-pressure is 32Mp, to compressing pistonBlank carries out sintering, and sintering temperature is: 1250 DEG C, sintering time is: 50 minutes, sintering atmosphere was trueSky passes into hydrogen and pressurization 8Mp in the time that sintering finishes, Slow cooling in air, and (3) are to pistonBlank carries out destressing processing, is heated 1100 DEG C, insulation 3h, and Slow cooling to 500 DEG C in stove,Quick water-cooled again, (4), to piston face carbo-nitriding processing, are placed in heated sealed stove workpiece and pass intoThe carburizers such as kerosene, are heated to 860 DEG C by temperature and make workpiece ooze carbo-nitriding under this high temperature, (5)Piston after carbo-nitriding is carried out to surface phosphoric acid processing, and scale removal or defect, adopt anaerobic to add afterwardsHeat is carried out impression finish forge, and (6) will carry out salt bath quenching through accurately machined piston, be heated 680-750 DEG CRear insulation 4h is cooling fast in salt solution, then carries out lonneal, and temperature is: 250 DEG C, and insulation4h, air cooling, hardness is 60HRC, (7) carry out deposition processes to the piston after Quenching Treatment, and piston is putIn being connected with the stove of ammonia, be heated to 1120 DEG C, taking hydrogen as carrier is by CH4Bring reactor into, by TiCBe deposited on piston face, (8) carry out surface finish processing to piston, remove the residue that chemical treatment thing stays,(9) piston after polishing is carried out to preservative treatment, by magnesia, silicate, waterglass, water etc. are joinedBecome thick mixing material, after stirring, be applied to steel surface, coating layer thickness is 50 μ m, wherein,20% magnesia, 25% silicate cement, waterglass 10%, all the other are water, then steel are put in to 400 DEG CUnder carry out heated baking, make its surface form layer protecting film, reach antiseptic and rustproof object.
Applicant's statement, the present invention illustrates detailed process equipment and process of the present invention by above-described embodimentFlow process, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, does not mean that the present inventionMust rely on above-mentioned detailed process equipment and process flow process could implement. Person of ordinary skill in the field shouldThis understands, any improvement in the present invention, the equivalence replacement to the each raw material of product of the present invention and auxiliary elementThe selections of interpolation, concrete mode etc., within all dropping on protection scope of the present invention and open scope.

Claims (1)

  1. Piston taking 38CrMnAl steel as material shape a manufacturing process, material 38CrMnAl steel,Comprise the weight percent content of lower column element: Mn0.8%-1.1%, C0.2%-0.5%, Si1.5%-2.3%,Cr0.7％-1.2％，Al1.3％-1.8％,Mo0.12％-0.57％,Sn0.01％-0.56％，Ni<0.003％,Ti < 0.02%, S < 0.03%, V0.01%-0.04%, all the other are iron and impurity thereof, it is characterized in that:
    (1) bar for base material is carried out to normalized treatment, be heated to 990-1120 DEG C by it, insulation 2-3h makes organizing after complete austenitizing of steel evenly cooling in air,
    (2) bar after normalized treatment is injected to die cavity with injection machine, institute's plus-pressure is 27-32Mp, to pressingThe piston blank of making type carries out sintering, and sintering temperature is: 1150-1250 DEG C, sintering time is: 40-50Minute, sintering atmosphere is vacuum, passes into hydrogen and pressurization 6-8Mp, in the time that sintering finishes in airSlow cooling,
    (3) piston blank is carried out to destressing processing, be heated 1000-1100 DEG C, insulation 2-3h, in stoveSlow cooling to 500 DEG C, quicker water-cooled,
    (4) to piston face carbo-nitriding processing, workpiece is placed in to heated sealed stove and passes into the carburizers such as kerosene,Temperature is heated to 800-860 DEG C and makes workpiece ooze carbo-nitriding under this high temperature,
    (5) piston after carbo-nitriding is carried out to surface phosphoric acid processing, scale removal or defect, adopt nothing afterwardsImpression finish forge is carried out in oxygen heating,
    (6) will carry out salt bath quenching through accurately machined piston, be incubated 2-4h after being heated 680-750 DEG CCooling fast in salt solution, then carry out lonneal, temperature is: 150-250 DEG C, and insulation 2-4h,Air cooling, hardness is 58-60HRC,
    (7) piston after Quenching Treatment is carried out to deposition processes, piston is placed in the stove that is connected with ammonia, be heated to1000-1120 DEG C, taking hydrogen as carrier is by CH4Bring reactor into, TiC be deposited on to piston face,
    (8) piston is carried out to surface finish processing, removes the residue that chemical treatment thing stays,
    (9) piston after polishing is carried out to preservative treatment, by magnesia, silicate, waterglass, water etc. are joinedBecome thick mixing material, after stirring, be applied to steel surface, coating layer thickness is 40-50 μ m,Wherein, the magnesia of 10%-20%, the silicate cement of 15-25%, waterglass 10%, all the other are water, then willSteel are put at 300-400 DEG C and carry out heated baking, make its surface form layer protecting film, reach anticorrosion anti-The object of rust.
CN201410571128.3A 2014-10-23 2014-10-23 Machining forming and manufacturing technique for piston made of 38CrMnAl steel Pending CN105583589A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410571128.3A CN105583589A (en) 2014-10-23 2014-10-23 Machining forming and manufacturing technique for piston made of 38CrMnAl steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410571128.3A CN105583589A (en) 2014-10-23 2014-10-23 Machining forming and manufacturing technique for piston made of 38CrMnAl steel

Publications (1)

Publication Number Publication Date
CN105583589A true CN105583589A (en) 2016-05-18

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Application Number Title Priority Date Filing Date
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107345264A (en) * 2017-07-21 2017-11-14 江苏军威电子科技有限公司 A kind of rust resistance and corrosion resistance hammer head processing technology
CN111893262A (en) * 2020-08-26 2020-11-06 河南科技大学 Heat treatment process of rust-proof and corrosion-proof steel
CN112576507A (en) * 2019-09-27 2021-03-30 安徽美芝精密制造有限公司 Manufacturing method of compressor piston and compressor piston

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107345264A (en) * 2017-07-21 2017-11-14 江苏军威电子科技有限公司 A kind of rust resistance and corrosion resistance hammer head processing technology
CN112576507A (en) * 2019-09-27 2021-03-30 安徽美芝精密制造有限公司 Manufacturing method of compressor piston and compressor piston
CN111893262A (en) * 2020-08-26 2020-11-06 河南科技大学 Heat treatment process of rust-proof and corrosion-proof steel

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Application publication date: 20160518