CN100503846C - Process of utilizing afterheat of casting in reducing stress ageing treatment - Google Patents
Process of utilizing afterheat of casting in reducing stress ageing treatment Download PDFInfo
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- CN100503846C CN100503846C CNB200610057267XA CN200610057267A CN100503846C CN 100503846 C CN100503846 C CN 100503846C CN B200610057267X A CNB200610057267X A CN B200610057267XA CN 200610057267 A CN200610057267 A CN 200610057267A CN 100503846 C CN100503846 C CN 100503846C
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The present invention discloses ageing treatment process of utilizing afterheat of casting in reducing the residual stress of casting. The ageing treatment process includes the following steps: knocking out the casting at 300-800 deg.c and eliminating runner, riser head, sand core and mold sand; loading into continuous heat treatment furnace at 300-600 deg.c; heating to 450-650 deg.c at the temperature raising speed of 80 deg.c/hr and maintaining for 1-8 hr, cooling slowly in the temperature decreasing speed lower than 30 deg.c/hr to 200 deg.c; and cooling to room temperature outside the furnace. The process can reduce the residual stress of casting to below 60 MPa and reach the requirement on casting for diesel engine. The present invention has saving in energy source, time and cost.
Description
Technical field
The present invention relates to ferrous metal and subtract stress technology, be used in particular for foundry goods utilizing afterheat of casting in reducing stress ageing treatment process and method thereof that continous way machinery casting production line is produced.
Background technology
Foundry goods subtracts the heat treated traditional technology commonly used of stress ageging:
Burr → subtract stress ageging thermal treatment is gone in unpack → go behind cool to room temperature dead head and molding sand, core, polishing.
Subtract stress ageging thermal treatment and be intended to reduce the interior casting residual stress of foundry goods.Its principle is that foundry goods is reheated 530～620 ℃, utilizes viscous deformation to reduce unrelieved stress, and cooling lentamente in stove then obtains unrelieved stress than original little foundry goods, and this is gray iron casting thermal treatment with the most use, referring to accompanying drawing 1.
Under the low situation of automaticmachines degree, foundry goods is unpacked postcooling to normal temperature, uses artificial removal's dead head and molding sand, core, and the heat treatment furnace of packing into subtracts stress to be handled.Its shortcoming is that foundry goods is unpacked postcooling to normal temperature, heats up again when subtracting the stress processing, has both wasted the energy, and efficient is low again.
The existing technology of thermal treatment process is a lot, useful shrend, oil immersion, treatment process such as air-cooled.And show recently through entrusting National Information Center's proxy retrieves to look into new numbering 05-243 " industry heating " fifth phase in 1998 " Roller Hearth Furnace for Annealing Hot Bearing Races production line " this be the super-huge heating installation of a high mechanization automatization, the red heat lasso that comes out from hot headers enters charging basket, and in the carrying out of each operation of thermal treatment, charging basket each stage such as return of dumping, the empty charging basket of cover automatically carry out, constitute the closed loop system of a heat-treatment production line.In addition, heating zone adopts the heating of gas-radiant pipe, and control temperature descending section and nodularization section then adopt the electrothermal radiation tube heating, and this all needs external heat source.It is made up of outer transportation of body of heater, furnace roller and mechanical transmission, hydrostatic transmission and stove and dumping material mechanism, and be that main body arrives the mechanical-hydraulic driving control system with control device able to programme, the temperature controlling system of heating of gas-radiant pipe and electrothermal radiation tube heating and relevant portion composition.This method purpose is nodularization, and the objective of the invention is to reduce the casting residual stress of foundry goods, and its technology, process and the purpose that reaches are fully inequality.Again according to application number 982357885, title " outer thermal source moves residual forging heat isothermal annealing device ", it has one by filling out the isothermal casing that thermal insulation material constitutes in the double-level-metal housing, its top is provided with the lifting suspension ring, bottom half is for flexibly connecting, there are supporting, channel-section steel in the below, bottom, casing top opening for feed is provided with the turnover panel by counterweight balance, the outer support of casing is provided with isothermal oven temperature, degree indicating instrument and the preceding temperature indicating gauge of forging cartonning, and two instrument are joined with waiting incubator temperature probe and forging temperature probe respectively.It mainly is with movably waiting incubator to replace constant-temperature oven, wait incubator to move arbitrarily with crane or fork truck, have enough to meet the need between forging and base storehouse, waiting incubator to place by the forging equipment.Its mainly be used in put into after workpiece forges have hinge is arranged at the bottom of suspension ring, the case and have contact with constitute with the case both sides flexibly connect, annealing device that the case mouth has opening for feed.This method purpose is to solve forging annealed insulation problem.With the casting residual stress that the objective of the invention is to reduce foundry goods, its technology, process and the purpose that reaches are fully inequality.Be two kinds of different Technologies.Moreover, Cha Xin Aviation Engineering Institutes Of Nanchang newspaper (natural science edition) the 2nd phase the 16th volume June in 2002 is reported according to the retrieval: " utilizing the research of waste heat production metal mold thin-walled ferritic spheroidal graphite cast iron spare ", its objective is in order to obtain ferritic spheroidal graphite cast iron spare, studied the magnesium iron composition, bred measure, heat treatment time influences foundry goods standard weave, with shortening the annealing of waste heat time, obtain the possibility of ferritic spheroidal graphite cast iron.Experimental implementation: fusing molten iron in GW-10 induction furnace, melt 5kg at every turn, when molten iron temperature reaches 1450 ℃, pour the interior spheroidizing of having a swollen head into.Ladle bottom pouring process is adopted in nodularization, adds nodulizing agent and Bi in bag, nucleating agent SiFe, and float at molten iron surface adding SiFe that silicon breeds and carry out mould cavity inoculation.Also want to be placed on the electric furnace behind the metal mold sprayed coating and toast, intensification reaches 500～600 ℃, shiny red after cast is unpacked, temperature is 800～900 ℃, casting parts thermal insulation 15,30,60min, and sample is come out of the stove, air cooling, cleaning, conclusion: utilize waste heat annealing light casting, strict to advancing the stove casting temperature, utilize the basic major part of waste heat foundry goods in 30min to change ferrite into, foundry goods advances furnace temperature and is not less than 840 ℃.It is little to prolong the soaking time effect.Less than 550 ℃, then ferrite is difficult to obtain more than 70% as furnace temperature, and these light castings need furnace temperature at 600～680 ℃ of insulation 30min, just can obtain 70% ferrite.The purpose of this method is to obtain ferritic spheroidal graphite cast iron spare, and the objective of the invention is to reduce the casting residual stress of foundry goods, and its technology, process and the purpose that reaches are fully inequality.
From as can be seen above, the present invention has novelty.
(1) studies contrast below in conjunction with prior art and the present invention and describe, learn the effect that same foundry goods difference eliminates stress referring to accompanying drawing 2.
(2) the formation reason of casting residual stress:
Ironcasting is at high temperature poured into a mould, and in solidifying process of cooling, Yin Wendu descends and produces contraction, is hindered as contraction, just can produce casting stress in foundry goods.Casting stress forms reason by it can be divided into thermal stresses, transformation stress and mechanical three kinds of the stress that hinder.
1, thermal stresses: because the speed of cooling difference of each several part in process of cooling of ironcasting, cause the shrinkage difference of each several part, but the foundry goods each several part holds together, condition each other to each other and produce stress.This owing to linear shrinkage is heated and is hindered the thermal stresses produces and generally become the interior unrelieved stress of foundry goods, the two-part temperature head of thickness was directly proportional when its size changed elastic stage with the foundry goods thick wall part into by plastic state, the wall thickness difference that is foundry goods is big more, and residual thermal stress is also big more.The all factors that can impel foundry goods to solidify and slow down speed of cooling simultaneously can both reduce the residual thermal stress in the foundry goods.
2, transformation stress: it is different with degree that the foundry goods each several part takes place in process of cooling by time of solid-state phase changes, makes the variation of volume and length also different, and condition each other between the each several part, causes transformation stress therefrom.For gray iron casting.When certain part of foundry goods is cooled to eutectoid temperature when following, when austenitic transformation is ferrite and high-carbon phase (graphite or cementite), owing to making the foundry goods part, eutectoid graphitization produces certain expansion, inconsistent as foundry goods each several part temperature, phase transformation does not take place simultaneously, will produce transformation stress.Because the degree of graphitization of the thick thickness portion of gray iron casting is more abundant than thin thin part, therefore, thin part is subjected to tensile stress, and the thickness portion compression chord.
3, machinery hinders stress; After ironcasting is cooled to elastic stage,, contraction produces machinery obstruction stress owing to being subjected to the machinery obstruction.It can show as tensile stress or stress.When hindering once eliminating stress, machinery also disappears, so it is a kind of temporary stress thereupon.
Casting stress is thermal stresses, transformation stress and mechanical stress three sum.Three kinds of stress on the ironcasting different sites are listed in Fig. 3.Learn three kinds of stress on the foundry goods different sites referring to Fig. 3."+σ " represents tensile stress, and " σ " represents stress.
Fig. 3 selects from: the casting handbook. and the 1st volume, cast iron/casting branch of Chinese Mechanical Engineering Society compiles. and-2 editions .-Beijing: China Machine Press, 2002.1:62
The casting stress of various cast irons is seen Fig. 4, the casting stress minimum of graphitic cast iron, spheroidal graphite cast iron maximum, the casting stress between of vermicular cast iron.Along with the raising of cast iron intensity, the casting stress of cast iron rises.Therefore, along with the growth of diesel engine reliability, more and more higher to intensity, the hardness requirement of cast iron, its casting stress is also increasing.
Fig. 4 selects from: the casting handbook. and the 1st volume, cast iron/casting branch of Chinese Mechanical Engineering Society compiles. and-2 editions .-Beijing: China Machine Press, 2002.1:62
(3) casting residual stress is to the influence and the harm of ironcasting
1, causes casting deformation
Because diesel engine cylinder block and cylinder cap are baroque high-strength thin-walled foundry goods, the unrelieved stress that castingprocesses causes portion within it is uneven, thereby can make irregular distortion such as the foundry goods generation is reversed, bending.Be illustrated with example.Learn that referring to Fig. 5, Fig. 6 there is the distortion situation of unrelieved stress in foundry goods.
Certainly in fact member stressed than this complexity many.One of harm that casting deformation is excessive is: because of process redundancy is scrapped inadequately.Although the unrelieved stress of the foundry goods distribution of portion within it is uneven, after the generation distortion, the power of portion system is still to be under the equilibrium state within it, and when foundry goods was carried out machining, this balance had just been broken, and it can make the foundry goods generation be out of shape for the second time.Learn that referring to Fig. 7, Fig. 8 foundry goods produces the situation of distortion for the second time after machining.
After the machining, part is out of shape once more, the working accuracy of part is reduced, even scrap.As the cylinder-bore of cylinder body, inhomogeneous through the bore hole after strain, become elliptical aperture by circular hole.
2, the cracking that causes ironcasting
Cold cracking is after ironcasting solidifies, and has been under the lesser temps, and the breakdown point that casting stress has surpassed cast iron produces.Cold cracking often appears at ironcasting and is subjected to the tensile position, and the place of stress concentration is particularly arranged.Ironcasting produces the tendency and the influence factor of cold cracking and influences the factor basically identical of casting stress.
Complex-shaped large-sized iron casting is easy to generate cold cracking.Some cold cracking can find that after the cleaning of unpacking on April 10th, 2005, the F3000 crankcase bearing covered the other crackle in fourth hole, had found exactly when foundry goods is unpacked; Also some foundry goods issues raw food in the back of unpacking at the state of placing and splits.Learn foundry goods cold cracking situation referring to Fig. 9.
If when the cleaning of foundry goods and machining, find crackle, can scrap foundry goods.But the most dangerous and fearful is, because the existence of casting residual stress, foundry goods has produced tiny crack in early days, but it is very little, perhaps do not run through whole foundry goods wall, naked eyes and leak test detect and all are not found, crackle is just expanded during use, causes motor fault, has a strong impact on reliability of products.Learn that referring to Figure 10, Figure 11 it influences the situation of reliability.
Following fault is fed back in the Shenyang high public transport of health Ford, and is typical exactly because casting residual stress causes the example of crack fault.Sequence number is that the diesel engine of J42XA400012 travels 1750 kilometers and finds that (casting numbering: 20031023C-374) the 3rd cylinder valve seating ring edge position has crackle to cylinder head.Through dissecting and physico-chemical analysis: the wall thickness of cylinder head uptake has 6.5mm, and material is qualified.Because this position is in the inside of uptake, external force may strike hardly, can get rid of the possibility that bump causes crackle; From detecting the result of cylinder cap unrelieved stress, big stress is born in the periphery of cylinder cap, and suitable tensile stress is being born in its inside, when casting stress surpasses breakdown point, promptly can produce cracking.
Further studies show that: the profile of ironcasting cold crack is successive linearity or smooth curve, and usually is to pass crystal grain rather than intercrystalline fracture.The cold crack fracture is clean, has metalluster or is slight oxidation tint.Cold cracking is also relevant with phosphorus content, as w in the graphitic cast iron (p)〉0.3% the time, a large amount of netted iron phosphide eutectics often appear, and cold cracking inclination obviously increases.
3, increase the machining difficulty, the wearing and tearing that strengthen cutter.Studies show that according to vapour casting institute: after reducing the unrelieved stress of foundry goods, make foundry goods machinability be improved significantly, prolonged life-span of cutter.
(4) the method research and the main result of minimizing residual stress of casting:
1, reduces the method for casting stress
Reduce the casting stress in the ironcasting, can make foundry goods after mechanical workout have the persistence of dimensional stability and precision preferably.The method that reduces casting stress mainly should manage to reduce the temperature head of ironcasting each several part in process of cooling, realizes solidifying simultaneously principle; Improve casting mold and core deformability; Suitably increase the cooling time of ironcasting in type, in order to avoid enlarge the temperature difference of each several part.Adopt powerful ball blast, make the residual tension of cast(ing) surface obtain discharging, even form residual compressive stress.
The method that the ironcasting using artificial that shape more complicated, dimensional stability are had relatively high expectations adds thermal life, oscillating aging or natural aging reduces casting stress.
(1) natural aging treatment is generally deposited foundry goods several years, makes unrelieved stress slowly lax, and the time is long, and continuous production in enormous quantities is not suitable for adopting.
(2) oscillating aging is handled.Dynamic stress that oscillating aging causes and unrelieved stress stack produce stress relaxation when surpassing material yield point, and the Bauschinger effect of CYCLIC LOADING has reduced unrelieved stress.
(3) timeliness thermal treatment: be divided into coal furnace processing, oil oven processing and electric furnace and handle.
Yuchai foundry cylinder cap core with precoated sand, body core with hot box process, prolong foundry goods cooling time and reduce the unpacking temperature of foundry goods, cast(ing) surface carries out after the measure such as powerful ball blast, the unrelieved stress of foundry goods is still very big.For this reason, carried out reducing the research of the way of residual stress of casting.
2, reduce the effect research of casting stress method
We have used quinquenniad, utilize advanced process means, reduce the research of residual stress of casting to adopting ways such as natural aging, oscillating aging, timeliness thermal treatment, and nearly hundred piece foundry goods are carried out the actual measurement of residual-stress value.Actual measurement mainly the results are shown in Figure 12.
Learn the relatively notes of residual stress of casting size when carrying out ageing treatment with different equipment referring to Figure 12: the foundry goods that is of unreceipted placement location is placed in annealing furnace at random among Figure 12.
Studies show that:
1, the residual-stress value without the foundry goods of anneal is very big.
YC6105QC body and cylinder cap to same iron clad water cast have been done test:
(1) body: average casting residual stress is 174.4MPa, and maximum value is 271.2MPa.
(2) cylinder cap: average casting residual stress is 232.1MPa, and maximum value is 304.9MPa.
2, handling different foundry goods with different annealing devices, is different to the effect that reduces residual stress of casting.
(1) coal furnace timeliness thermal treatment
1. Yuchai foundry body coal furnace timeliness thermal treatment, foundry goods is placed at random: YC6105 body residual-stress value average out to 174.4MPa, maximum value is 271.2MPa.
2. Yuchai foundry body coal furnace timeliness thermal treatment, foundry goods is placed on the superiors: YC6112 body residual-stress value average out to 115.7MPa, maximum value is 172.8MPa.YC6112 cylinder cap residual-stress value average out to 40.6MPa, maximum value is 56.9MPa.
3. Yuchai foundry cylinder cap coal furnace timeliness thermal treatment, foundry goods is placed at random: YC6105QC cylinder cap residual-stress value average out to 232.1Mpa, maximum value is 271.2MPa.
From coal furnace timeliness thermal effectiveness, the residual-stress value of placing sampling observation at random is all very big; But the casting stress that is placed on the upper strata is low, and the cylinder cap that is placed on the upper strata is lighter than body, and stress is lower.The temperature distributing disproportionation that each several part in this coal furnace is described is even.Check this stove discovery: the thermopair of measuring furnace temperature is placed on the top (Figure 13) of stove, when thermopair shows that the temperature of furnace roof portion reaches requiring of technology, promptly enter the stage of insulation, and this moment is in the bottom of stove, still very low in the position of poor thermal conduction temperature, even can see that the color that is bonded in the foil gauge on the body also changes not quite.The colour-change of the foundry goods that comes out from annealing also can be seen the temperature contrast of whole stove: the scab that is placed on the cast(ing) surface at the top white (Figure 14) that incinerated, and in the centre or the scab of the cast(ing) surface of bottom almost not do not become or black (Figure 15).
(2) electric furnace timeliness thermal treatment
We test and detect at the different electric furnaces (cabinet-type electric furnace, well-type electric furnace, continuous type furnace) of seven families, and test specimen has YC4110, YC6108ZC, YC6112 body, and test specimen is placed in stove at random.In detected tens foundry goods, the effect that reduces unrelieved stress is all fine and stable, and the average residual-stress value of foundry goods is less than 51MPa, maximum value except a Delta to 100.4MPa, all the other are all less than 87MPa.
Wherein the effect of continous way timeliness thermal treatment electric furnace is preferable, and residual stress of casting mean value minimum is 19.9MPa, and maximum value is 56.2MPa.
3, natural aging treatment
Through the YC6105QC cylinder cap is resurveyed near former test point, residual-stress value is respectively 154.0MPa and 268.9MPa, still maintains higher level.
4, oscillating aging is handled
9 bodies are carried out oscillating aging handle, residual-stress value preceding to shaking, after shaking is measured.Found that it is about 30% that oscillating aging can make the residual-stress value of foundry goods on average reduce, reached the standard of mechanical industry JB/T5926-91 " the oscillating aging processing parameter is selected and technical requirements ".
But owing to the residual-stress value that foundry goods is original is higher, so oscillating aging still maintains higher level after handling: mean value is 140.3MPa, and maximum value is 175.4MPa.
(5) conclusion
1, along with the raising of cast iron intensity, the casting residual stress of cast iron rises.Thereby along with the growth of diesel engine reliability, more and more higher to intensity, the hardness requirement of cast iron, its casting residual stress is also increasing.The result of test also shows: if foundry goods is not treated, its residual-stress value is very high.
2, the effect of minimizing residual stress of casting is relevant with aging heat treatment technology with the homogeneity of furnace temperature, has nothing to do with the size of foundry goods and the size of structure and original unrelieved stress.How complicated the size of, original unrelieved stress regardless of casting structure can reduce the unrelieved stress of foundry goods with the method for thermal treatment timeliness.The homogeneity of furnace temperature and aging heat treatment technology are the key factors that influence reduces stress effect, if furnace temperature evenly, can really realize aging heat treatment technology, no matter be coal stove or electric furnace, all can obtain the effect of identical minimizing unrelieved stress.But electric furnace is easy to control, and the level of automation height pollutes few.
3, exist under the situation of big residual-stress value for foundry goods, should not adopt oscillating aging to handle.
Summary of the invention
Technical solution of the present invention is such.The object of the present invention is to provide a kind of sand removal, remove feeder continuous heat-treating drier insulation of packing into immediately that utilizes foundry goods high temperature to unpack to be, the novel process that cooling is afterwards come out of the stove, reach and utilize waste heat to reduce the cast casting unrelieved stress, energy-saving and cost-reducing, increase the benefit, the new process of efficient.Produced 1.8 ten thousand tons of foundry goods in 10 months 3～December in 2005 through Yuchai foundry and calculate, low-cost about 1,200 ten thousand yuan of co-falling (calculating) by 0.181 yuan/kg.Use the test of continous way timeliness thermal treatment electric furnace and show that the average minimum of cast casting unrelieved stress is 19.9MPa, is 56.2MPa to the maximum.Meet present diesel engine and other foundry goods service requirements fully.It is characterized in that: casting temperature is unpacked for 300～800 ℃, mechanical manipulator is removed most of molding sand and core, removes casting pressing port, 300～600 ℃ of continuous heat-treating driers of packing into, 550 ± 100 ℃ are incubated 1～8 hour, slowly are cooled to come out of the stove below 200 ℃ air cooling to room temperature through continuous heat-treating drier again.
Time and temperature relation are: by furnace temperature and timing relationship is the foundry goods charging temperature 300～600 ℃ the time, heat up with＜80 ℃/h, and in the time of 450～650 ℃ insulation 1～8h, be cooled to the air cooling of coming out of the stove below 200 ℃ with＜30 ℃/h afterwards.
Description of drawings:
It is such that structure of the present invention constitutes:
Fig. 1 handles curve synoptic diagram for tradition commonly used subtracts stress.
Fig. 2 is the foundry goods difference effect comparison table that eliminates stress.
Fig. 3 is three kinds of stress sheets of foundry goods different sites.
Fig. 4 is the casting stress chart of different cast irons.
The unrelieved stress synoptic diagram that Fig. 5, Fig. 6 exist for foundry goods.
Fig. 7, Fig. 8 are that foundry goods produces the secondary deformation synoptic diagram after machining.
Fig. 9 is for causing foundry goods cold cracking synoptic diagram.
Figure 10, Figure 11, produce the cracking synoptic diagram when surpassing breakdown point for cast casting stress.
Residual stress of casting size comparative graph when Figure 12 carries out ageing treatment for distinct device.
The synoptic diagram that Figure 13, Figure 14, the thermal treatment of Figure 15 coal furnace timeliness change.
Figure 16 is a process flow sheet of the present invention.
Time and temperature coordinate synoptic diagram that Figure 17 changes in the different periods for foundry goods of the present invention.
Embodiment
Foundry goods is unpacked at 300～800 ℃, after shifting vibratory shakeout machine onto, mechanical manipulator is removed dead head, remove most of molding sand, core sand, foundry goods is put into continuous annealing furnace, be warmed up to 450～650 ℃ of insulations continuously after 1～8 hour in the section that heats up, slowly be cooled to come out of the stove below 200 ℃ air cooling to room temperature at cooling section.After tested, the casting residual stress of foundry goods is less than 60MPa, and energy consumption per ton is that the tradition used always subtracts the about 1/4 of stress treatment process, and save energy has reduced production cost, enhances productivity.Pick up or put down foundry goods, sand removal, remove dead head with mechanical manipulator.Mechanical manipulator designs operation program according to purposes, follow procedure configures corresponding component of machine and electronic circuit board is made, continuous annealing furnace is with a casing, casing welds with steel plate, and electric stove wire is housed in the case, and electrothermal tube and configuration electrical heating element are connected power distribution cabinet, electrical heating element is selected a plurality of retainings time for use, can be a retaining by the 100 ℃ of volumes that heat up, the time be provided with randomness, the ventilative speed of regulating of annealing furnace box sealing formula or windowing.Need to cool off the exhausting of to window fast.The dolly of electric furnace casing dress foundry goods can dispose quantity, size by output.The outsourcing of electrical heating element selection standard spare also can own design and installation, reaches to connect electricity get final product in case.Allow if consider site location, working conditions allows also can heat changing into coal fire or hot gas with electric furnace, heats without electric furnace, but will guarantee that the heat foot in the stove is stable.Same section temperature is evenly distributed, and extreme difference is not more than 50 ℃.Its technological process of production is that foundry goods is unpacked at 300～800 ℃, mechanical manipulator is removed dead head, is removed core, molding sand, the continuous heat-treating drier insulation 1～8 hour of packing into the foundry goods of waste heat, the air cooling that slowly is cooled to afterwards come out of the stove below 200 ℃ gets product to room temperature.Quality meets the requirement of diesel engine foundry goods to casting residual stress fully, satisfies present diesel engine and other foundry goods service requirements.
Claims (2)
1. one kind is utilized afterheat of casting to reduce the casting residual stress aging treatment process, it is characterized in that technical process is: casting temperature is unpacked for 300～800 ℃, mechanical manipulator is removed most of molding sand and core, remove casting pressing port, 300～600 ℃ of continuous heat-treating driers of packing into, 550 ± 100 ℃ are incubated 1～8 hour, slowly are cooled to come out of the stove below 200 ℃ air cooling to room temperature through continuous heat-treating drier again.
2. reduce the casting residual stress aging treatment process according to the described afterheat of casting that utilizes of claim 1, it is characterized in that time and temperature relation are: by furnace temperature and timing relationship is the foundry goods charging temperature 300～600 ℃ the time, heat up with＜80 ℃/h, and in the time of 450～650 ℃, be incubated 1～8h, be cooled to the air cooling of coming out of the stove below 200 ℃ with＜30 ℃/h afterwards.
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| 机床铸件热时效、残余应力和精度稳定性的关系. 北京机床研究所.铸造，第4期. 1974 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI686483B (en) * | 2018-10-24 | 2020-03-01 | 財團法人金屬工業研究發展中心 | Method for stabilizing size of cast iron |
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