CN103937945B - Technology for Heating Processing of spheroidal graphite cast-iron Piston Casting and application thereof - Google Patents
Technology for Heating Processing of spheroidal graphite cast-iron Piston Casting and application thereof Download PDFInfo
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- CN103937945B CN103937945B CN201410113626.3A CN201410113626A CN103937945B CN 103937945 B CN103937945 B CN 103937945B CN 201410113626 A CN201410113626 A CN 201410113626A CN 103937945 B CN103937945 B CN 103937945B
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- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 119
- 238000005266 casting Methods 0.000 title claims abstract description 113
- 238000010438 heat treatment Methods 0.000 title claims abstract description 39
- 238000005516 engineering process Methods 0.000 title claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 28
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 28
- 239000011159 matrix material Substances 0.000 claims abstract description 19
- 239000002826 coolant Substances 0.000 claims abstract description 17
- 239000003125 aqueous solvent Substances 0.000 claims abstract description 14
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 13
- 239000000956 alloy Substances 0.000 claims abstract description 13
- 229910001566 austenite Inorganic materials 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 7
- 238000000265 homogenisation Methods 0.000 claims description 6
- 229910001018 Cast iron Inorganic materials 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract description 10
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000010791 quenching Methods 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical group C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Abstract
The present invention relates to the Technology for Heating Processing of a kind of spheroidal graphite cast-iron Piston Casting, a, the spheroidal graphite cast-iron Piston Casting that will be in room temperature load electric furnace, are heated to 620～680 DEG C, insulation 1～2h；B, be again heated to 920 ± 10 DEG C, insulation 2 ± 0.5h；C, be cooled to 850～880 DEG C, insulation 1 ± 0.1h；D, come out of the stove after put into rapidly in aqueous solvent cooling medium, chilling period controls, 10～20s, to make spheroidal graphite cast-iron Piston Casting be cooled to 600～750 DEG C, from aqueous solvent cooling medium take out；E, spheroidal graphite cast-iron Piston Casting is placed in air, natural cooling；G, the spheroidal graphite cast-iron Piston Casting after air cooling to room temperature is carried out temper, it is thus achieved that the content of pearlite in alloy of spheroidal graphite cast-iron piston matrix spheroidal graphite cast-iron Piston Casting more than 90%.The Technology for Heating Processing of the nodular iron casting that the present invention is complicated for structure, wall unevenness is even and content of pearlite in alloy requirement is high.
Description
Technical field
The present invention relates to Technology for Heating Processing of a kind of spheroidal graphite cast-iron Piston Casting and application thereof, belong to ductile cast iron casting heat treatment
Technology field.
Background technology
Pearlite type spheroidal graphite cast-iron has higher-strength, wearability, low toughness, is suitable to the parts higher to requirement of strength,
The structural member of vehicle is used widely.
The pearlite strengthening of conventional spheroidal graphite cast-iron generally uses normalizing process, i.e. after the austenitizing of G. Iron Castings, passes through
The insulation of a period of time, after coming out of the stove immediately air cooling, air-cooled or mist is cold, making basic body transforms is pearlitic structrure, reaches to improve hard
Degree, intensity and the effect of wearability.Ink cast iron normalizing heating-up temperature general control at 800～900 DEG C, too high normalizing temperature
Degree can not increase pearlite fraction, causes austenite crystal thick on the contrary, makes carbon dissolve in the quantity of austenite too much, during cooling
Easily separate out net secondary cementite at crystal boundary, make intensity and the degraded toughness of G. Iron Castings, and too low normalizing temperature cannot
Obtain the austenite of uniformity.
Being the internal combustion engine of QT700-2 for material, its matrix content of pearlite in alloy requires >=90%, hardness requirement
HB225～305, therefore spray need to be carried out the Technology for Heating Processing of pearlite strengthening.Due to spheroidal graphite cast-iron Piston Casting structure
Complicated, wall thickness great disparity, and thick large part core cooling is extremely slow, additionally blowing or spray process easily occur blowing or
The position, dead angle of spraying.Therefore traditional normalizing process, no matter air cooling, air-cooled or mist is cold, owing to its cooling capacity is the most limited,
Make matrix medium pearlite content extremely unstable after spheroidal graphite cast-iron Piston Casting heat treatment, same foundry goods different parts with
And cast(ing) surface is uneven with the content of pearlite in alloy of core, is mostly between 40% to 80%, it is impossible to meet high pearly-lustre
The requirement of body burden.
Quenching is spheroidal graphite cast-iron austenitizing, at held for some time, then inserts in oil groove or other media, the most sufficiently fast
Speed cools down, suppression pearlite and ferritic formation so that low temperature austenite is transformed into martensite below Ms point temperature,
Obtain highest hardness.
And isothermal hardening be foundry goods heating is made its austenite homogenization after, be allowed to be as cold as soon bainite temperature range (260～
400 DEG C), to put in the isothermal medium of temperature a little higher than Ms point, isothermal keeps certain time, generally in bath during insulation
Between be 30～60min, be allowed to austenite and be changed into bainite, then take out and be placed in air cooling, although isothermal hardening energy
It is suitable for cast shape complicated, deformation and the cracking of foundry goods can be prevented, but need the huge bath waiting thermohaline circulation to carry out accurately
Temperature control, Equipment for Heating Processing is costly, and cost is the highest.
But use traditional quenching and same temperature hardening heat treatment technique, heat treatment is carried out for spheroidal graphite cast-iron Piston Casting, exists
Problems with:
1, after heat treatment the matrix of spheroidal graphite cast-iron Piston Casting equal non-pearlite tissue, its tissue and performance with require phase
Difference is very remote, not enough because of content of pearlite in alloy due to Piston Casting, causes Piston Casting annular groove portion faces high frequency after semifinishing
Impewdance matching hardness generally less than required standard, reduces piston abrasion-proof performance.
2, complicated due to spheroidal graphite cast-iron Piston Casting structure, wall unevenness is even, quenching process deforms and the tendency that ftractures very
Greatly, easily produce hardening flaw, cause spheroidal graphite cast-iron Piston Casting qualification rate to decline.
Summary of the invention
It is an object of the invention to provide a kind of heat treatment low cost, the content of pearlite in alloy of spheroidal graphite cast-iron piston matrix can be stablized
Ensure the Technology for Heating Processing of spheroidal graphite cast-iron Piston Casting more than 90%.
The present invention is that the technical scheme reaching above-mentioned purpose is: the Technology for Heating Processing of a kind of spheroidal graphite cast-iron Piston Casting, its feature
It is: according to the following steps,
A kind of Technology for Heating Processing of spheroidal graphite cast-iron Piston Casting, it is characterised in that: according to the following steps,
A, the spheroidal graphite cast-iron Piston Casting that will be in room temperature load electric furnace, and are heated to 620～680 DEG C, are incubated 1～2h,
Spheroidal graphite cast-iron Piston Casting is preheated, makes spheroidal graphite cast-iron Piston Casting equalizing temperature；
B, again spheroidal graphite cast-iron Piston Casting is heated to 920 ± 10 DEG C, is incubated 2 ± 0.5h, makes spheroidal graphite cast-iron Piston Casting base
Body is completely reformed into austenite homogenization；
C, spheroidal graphite cast-iron Piston Casting is cooled to 850～880 DEG C, is incubated 1 ± 0.1h；
D, spheroidal graphite cast-iron Piston Casting is come out of the stove after put into rapidly in aqueous solvent cooling medium, chilling period control 10～
20s, makes spheroidal graphite cast-iron Piston Casting be cooled to 600～750 DEG C, takes out from aqueous solvent cooling medium；
E, spheroidal graphite cast-iron Piston Casting is placed in air, natural cooling；
G, finally the spheroidal graphite cast-iron Piston Casting after air cooling to room temperature is carried out temper, it is thus achieved that spheroidal graphite cast-iron piston matrix
The content of pearlite in alloy of tissue spheroidal graphite cast-iron Piston Casting more than 90%.
Wherein: in b walks, spheroidal graphite cast-iron Piston Casting is heated to 920 ± 5 DEG C, it is incubated 2h.
Described in c walks, spheroidal graphite cast-iron Piston Casting is cooled to 860～870 DEG C, is incubated 1h.
Described in d walks, spheroidal graphite cast-iron Piston Casting is put into rapidly in aqueous solvent cooling medium after coming out of the stove, and chilling period exists
12～18s, make spheroidal graphite cast-iron Piston Casting be cooled to 650～720 DEG C.
The temperature of described aqueous solvent cooling medium is at 20 DEG C ± 15 DEG C.
The temperature of described temper is 550～620 DEG C, is incubated 2～4h, air cooling of coming out of the stove afterwards.
The purposes of the instantaneous quenching technical of spheroidal graphite cast-iron Piston Casting of the present invention, it is characterised in that: it is used for obtaining spheroidal graphite cast-iron and lives
The content of pearlite in alloy of plug matrix spheroidal graphite cast-iron Piston Casting more than 90%.
Spheroidal graphite cast-iron Piston Casting is first carried out the pre-heat treatment in the heat temperature raising stage by the present invention, is heated to from room temperature by foundry goods
620～680 DEG C of insulations 1～2h, owing to spheroidal graphite cast-iron is more slow at cryogenic conditions heat transfer rate, are allowed to by the pre-heat treatment
Being heated evenly of each position of foundry goods.The spheroidal graphite cast-iron Piston Casting that the present invention is complicated by structure, wall unevenness is even is carried out at preheating
Reason energy, can reduce the thermal stress of spheroidal graphite cast-iron Piston Casting, prevents casting deformation, solves spheroidal graphite cast-iron Piston Casting direct
By producing bigger thermal stress when being warming up to austenitizing temperature, the problem of casting portion structure gross distortion will be caused.
The present invention is by after spheroidal graphite cast-iron Piston Casting preheating insulation 1～2h, then is warmed up to 920 ± 10 DEG C, is incubated 2 ± 0.5h,
Being down to 850～880 DEG C of insulation 1h again, after spheroidal graphite cast-iron Piston Casting reaches austenitizing temperature, insulation guarantees that foundry goods is complete
Austenite homogenization, simultaneously because spheroidal graphite cast-iron Piston Casting be heated to 920 ± 10 DEG C be incubated after, also make foundry goods matrix
It is completely reformed into austenite homogenization, eliminates cementite.
The present invention uses quickly cooling, makes spheroidal graphite cast-iron Piston Casting top layer and core temperature be rapidly decreased to 600～750 DEG C,
Accelerate austenite eutectoid reaction by quickly cooling, restrained effectively C in austenite and spread in globular graphite and free ferrum
The precipitation of ferritic, is carried out so that diffused eutectoid reaction forms direction to pearlite.Simultaneously cooling under conditions of rapidly also
Same foundry goods different parts, cast(ing) surface to core can be made all to reach austenite transformation temperature, thus ensure that foundry goods is each
Position all reaches the content of pearlite in alloy of more than 90%, it is ensured that cast(ing) surface and the uniformity of core matrix, refines pearlite,
Improve spheroidal graphite cast-iron Piston Casting intensity.The present invention uses quickly cooling, and by the temperature before cooling by 920 DEG C ± 10 DEG C
It is reduced to 850～880 DEG C, the stress produced when significantly reducing quickly cooling, make spheroidal graphite cast-iron Piston Casting depart from water-soluble
Agent cooling medium, to natural cooling, prevents stress excessive the most further and causes deformation and the cracking of spheroidal graphite cast-iron Piston Casting
Problem, improve Piston Casting heat treatment qualification rate.The present invention can use existing common Equipment for Heating Processing, it is not necessary to special
Equipment, heat treatment low cost.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings embodiments of the invention are described in further detail.
Fig. 1 is the heat treatment cycle curve figure of spheroidal graphite cast-iron Piston Casting of the present invention.
Fig. 2 is that existing spherical iron piston uses the Technology for Heating Processing of conventional normalizing to obtain matrix (500X).
Fig. 3 is that spheroidal graphite cast-iron Piston Casting uses the Technology for Heating Processing of the present invention to obtain matrix (100X).
Fig. 4 is that spheroidal graphite cast-iron Piston Casting uses the Technology for Heating Processing of the present invention to obtain matrix (500X).
Detailed description of the invention
As shown in Figure 1, the Technology for Heating Processing of the spheroidal graphite cast-iron Piston Casting of the present invention, according to the following steps,
A, the spheroidal graphite cast-iron Piston Casting that will be in room temperature load electric furnace, and are heated to 620～680 DEG C, are incubated 1～2h,
Logical spheroidal graphite cast-iron Piston Casting is preheated, makes spheroidal graphite cast-iron Piston Casting equalizing temperature, by complicated to structure,
The even spheroidal graphite cast-iron Piston Casting of wall unevenness carries out the pre-heat treatment, the effective thermal stress reducing spheroidal graphite cast-iron Piston Casting,
Prevent Piston Casting from deforming.The present invention is shown in Table 1 institute to the specific embodiment of spheroidal graphite cast-iron Piston Casting preheating temperature and time
Show.
Table 1
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Embodiment 8 |
| Temperature (DEG C) | 630 | 640 | 650 | 660 | 665 | 670 | 675 | 680 |
| Time (h) | 2 | 1.8 | 1.6 | 1.5 | 1.5 | 1.2 | 1.2 | 1 |
B, again spheroidal graphite cast-iron Piston Casting is heated to 920 ± 10 DEG C, is incubated 2 ± 0.5h, makes spheroidal graphite cast-iron Piston Casting base
Body is completely reformed into austenite homogenization, eliminates carbide, preferably spheroidal graphite cast-iron Piston Casting and is heated to 920 ± 5 DEG C,
Insulation 2h, can use constant-speed heating.The specific embodiment of spheroidal graphite cast-iron Piston Casting acid extraction is shown in by the present invention
Shown in table 2.
Table 2
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Embodiment 8 |
| Temperature (DEG C) | 910 | 915 | 915 | 920 | 925 | 930 | 910 | 930 |
| Time (h) | 2.5 | 2.2 | 2 | 2 | 1.5 | 2 | 1.8 | 1.5 |
C, spheroidal graphite cast-iron Piston Casting is cooled to 850～880 DEG C, is incubated 1 ± 0.1h, preferably spheroidal graphite cast-iron Piston Casting
It is cooled to 860～870 DEG C, is incubated 1h, the stress produced during to reduce quickly cooling.The present invention is to spheroidal graphite cast-iron Piston Casting
The specific embodiment of cooling temperature and time is shown in Table 3.
Table 3
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Embodiment 8 |
| Temperature (DEG C) | 850 | 860 | 865 | 870 | 868 | 870 | 880 | 875 |
| Time (h) | 1.1 | 1 | 1 | 1 | 1 | 0.95 | 0.9 | 0.95 |
D, spheroidal graphite cast-iron Piston Casting is come out of the stove after put into rapidly in aqueous solvent cooling medium, chilling period control 10～
20s, makes spheroidal graphite cast-iron Piston Casting be cooled to 600～750 DEG C, takes out from aqueous solvent cooling medium, and solvent of the present invention is cold
But the temperature of medium is at 20 DEG C ± 15 DEG C, makes the temperature of aqueous solvent cooling medium be maintained under room temperature environment, and the present invention passes through
Quickly cooling is with austenite eutectoid reaction in acceleration matrix, it is suppressed that in austenite, C spreads and free ferrum element in globular graphite
The precipitation of body, thus increase pearlite fraction, and refine pearlite, improve intensity, also solve because cooling stress is excessive simultaneously
And cause the problem that foundry goods ftractures.The best chilling period of the present invention controls in the 12～18s temperature making spheroidal graphite cast-iron Piston Casting
It is down to 650～720 DEG C, takes out from aqueous solvent cooling medium, have more and fixed in spheroidal graphite cast-iron Piston Casting can be made
Pearlite fraction, the pearlite fraction in spheroidal graphite cast-iron Piston Casting matrix is more than 95%, and the spheroidal graphite cast-iron piston of the present invention is cast
The chilling temperature of part can be obtained by thermometric, the aqueous solvent cooling medium of the present invention can use PAG coolant or
Aqua-Quench 251 Water Soluble Cooling Liquid.The cool time of spheroidal graphite cast-iron Piston Casting of the present invention and being embodied as of temperature
Example is shown in Table 4.
Table 4
E, spheroidal graphite cast-iron Piston Casting is placed in air, natural cooling, Piston Casting can be placed in void spaces and carry out sky
Cold.
G, finally the spheroidal graphite cast-iron Piston Casting after air cooling to room temperature is carried out temper, to obtain spheroidal graphite cast-iron piston base
The content of pearlite in alloy of soma spheroidal graphite cast-iron Piston Casting more than 90%, by temper to improve spheroidal graphite cast-iron piston
Toughness and eliminate stress, the tempering process of the present invention, its temperature is 550～620 DEG C, be incubated 2～4h, go out afterwards
Stove air cooling.The specific embodiment of temper of the present invention is shown in Table 5.
Table 5
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Embodiment 8 |
| Temperature (DEG C) | 550 | 560 | 570 | 580 | 590 | 600 | 610 | 620 |
| Time (h) | 4 | 3 | 3.5 | 2.5 | 2.1 | 2.2 | 2.2 | 2 |
The spheroidal graphite cast-iron Piston Casting of the present invention is QT700-2 spheroidal graphite cast-iron, and chemical composition is joined and is by mass percentage:
3.7%C, 2.5%Si, 0.48%Mn, 0.6%Cu ,≤0.08%P ,≤0.02%S, with medium-frequency induction furnace melting the general of 3t
Base iron is through sufficient nodularization and breeds, and nodulizing grade is 2 grades, and sphere diameter size rank is 6 grades, and matrix is 55%
Ferrite+pearlite, tensile strength Rm is 582Mpa, it is stipulated that plasticity prolongs raw intensity Rp0.2For 401Mpa, have no progeny and stretch
Long rate is the spheroidal graphite cast-iron Piston Casting of 7%.Spheroidal graphite cast-iron Piston Casting after the heat treatment of the present invention, according to
GB/T9441-2009 and GB/T228.1-2010 and have GB/T231.1-2009 standard-required to make sample, and to each reality
The sample executing example is tested, and each specific performance index is shown in Table 6,
Table 6
The purposes of the instantaneous quenching technical of spheroidal graphite cast-iron Piston Casting of the present invention, for obtaining spheroidal graphite cast-iron piston matrix
Content of pearlite in alloy spheroidal graphite cast-iron Piston Casting more than 90%.
It can be seen that the Technology for Heating Processing of the spheroidal graphite cast-iron Piston Casting for preparing of the present invention and conventional normalizing obtains from Fig. 2～4
Comparing to matrix, the present invention can obtain and fully meet the requirement of QT700-2 material and the spheroidal graphite of more than 90% pearlite requirement
Cast-iron piston foundry goods.The Technology for Heating Processing of the present invention cannot be only used for spheroidal graphite cast-iron Piston Casting, it may also be used for other structure is multiple
Miscellaneous ductile cast iron casting.
Claims (7)
1. the Technology for Heating Processing of a spheroidal graphite cast-iron Piston Casting, it is characterised in that: according to the following steps,
A, the spheroidal graphite cast-iron Piston Casting that will be in room temperature load electric furnace, and are heated to 620～680 DEG C, are incubated 1～2h,
Spheroidal graphite cast-iron Piston Casting is preheated, makes spheroidal graphite cast-iron Piston Casting equalizing temperature；
B, again spheroidal graphite cast-iron Piston Casting is heated to 920 ± 10 DEG C, is incubated 2 ± 0.5h, makes spheroidal graphite cast-iron Piston Casting base
Body is completely reformed into austenite homogenization；
C, spheroidal graphite cast-iron Piston Casting is cooled to 850～880 DEG C, is incubated 1 ± 0.1h；
D, spheroidal graphite cast-iron Piston Casting is come out of the stove after put into rapidly in aqueous solvent cooling medium, chilling period control 10～
20s, makes spheroidal graphite cast-iron Piston Casting be cooled to 600～750 DEG C, takes out from aqueous solvent cooling medium；
E, spheroidal graphite cast-iron Piston Casting is placed in air, natural cooling；
G, finally the spheroidal graphite cast-iron Piston Casting after air cooling to room temperature is carried out temper, it is thus achieved that spheroidal graphite cast-iron piston matrix
The content of pearlite in alloy of tissue spheroidal graphite cast-iron Piston Casting more than 90%.
The Technology for Heating Processing of spheroidal graphite cast-iron Piston Casting the most according to claim 1, it is characterised in that: in b walks,
Spheroidal graphite cast-iron Piston Casting is heated to 920 ± 5 DEG C, is incubated 2h.
The Technology for Heating Processing of spheroidal graphite cast-iron Piston Casting the most according to claim 1, it is characterised in that: described at c
In step, spheroidal graphite cast-iron Piston Casting is cooled to 860～870 DEG C, is incubated 1h.
The Technology for Heating Processing of spheroidal graphite cast-iron Piston Casting the most according to claim 1, it is characterised in that: described at d
In step, spheroidal graphite cast-iron Piston Casting is put into rapidly in aqueous solvent cooling medium after coming out of the stove, and chilling period, 12～18s, makes ball
Ink cast-iron piston foundry goods is cooled to 650～720 DEG C.
The Technology for Heating Processing of spheroidal graphite cast-iron Piston Casting the most according to claim 1, it is characterised in that: described water-soluble
The temperature of agent cooling medium is at 20 DEG C ± 15 DEG C.
The Technology for Heating Processing of spheroidal graphite cast-iron Piston Casting the most according to claim 1, it is characterised in that: described returns
The temperature that fire processes is 550～620 DEG C, is incubated 2～4h, air cooling of coming out of the stove afterwards.
The purposes of the Technology for Heating Processing of spheroidal graphite cast-iron Piston Casting the most according to claim 1, it is characterised in that: use
In the content of pearlite in alloy spheroidal graphite cast-iron Piston Casting more than 90% obtaining spheroidal graphite cast-iron piston matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410113626.3A CN103937945B (en) | 2014-03-25 | Technology for Heating Processing of spheroidal graphite cast-iron Piston Casting and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410113626.3A CN103937945B (en) | 2014-03-25 | Technology for Heating Processing of spheroidal graphite cast-iron Piston Casting and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103937945A CN103937945A (en) | 2014-07-23 |
| CN103937945B true CN103937945B (en) | 2016-11-30 |
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