CN103008600A - Method for estimating highest temperature of casting mold during centrifugal casting - Google Patents
Method for estimating highest temperature of casting mold during centrifugal casting Download PDFInfo
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Abstract
The invention belongs to the technical field of centrifugal casting, and particularly provides a method for estimating highest temperature of a casting mold during centrifugal casting. The method comprises the following steps: selecting a sample number of a casting material according to the classification of the casting material; dividing the temperature of the casting mold into a plurality of temperature sampling points according to a preset temperature difference; figuring out a value alpha corresponding to the temperature value of each temperature collecting point; and figuring out a temperature rise value of the casting mold according to a temperature rise value equation of the casting mold, so as to estimate highest temperatures of the casting molds of a copper casting, an iron casting and a carbon steel casting in the centrifugal casting. The method has the advantages as follows: the actual highest temperature of the centrifugal casting mold of a common casting is estimated with low cost according to high temperature physical property data of the traditional castings and the casting mold materials; therefore, whether a specific casting can be cast by using a specific centrifugal casting mold or not can be judged, and temperature basis is provided for strength checking of the casting mold when the centrifugal casting mold is damaged.
Description
Technical field
The invention belongs to the centrifugal casting technique field, the evaluation method of casting mold maximum temperature when being specifically related to a kind of centrifugal casting, the estimation of casting mold maximum temperature when being applicable to tin bronze, aluminium bronze, brass, casting pig, spheroidal graphite cast-iron, carbon cast steel centrifugal casting.
Background technology
Foundry goods when centrifugal casting generally is divided into cast tin bronze, aluminium bronze, brass, casting pig and spheroidal graphite cast-iron, mild steel, all kinds of foundry goods of medium carbon steel at present.In theory, when mold temperature was elevated to maximum temperature, the caloric receptivity of unit mass casting mold was q
Casting mold=C
Casting moldΔ T, then the heat of casting mold absorption is Q
The type of hesitating=M
Casting moldq
Casting mold=M
Casting moldC
Casting moldΔ T, and the heat that foundry goods distributes is Q
Foundry goods=M
Foundry goods[C
Liquid(t
1-t
2)+L+C
Gu(t
3-t
4)].Foundry goods part heat can be dispersed in the air when considering casting, therefore when the foundry goods heat radiation was in thermal balance with the casting mold heat absorption, equation of heat balance was: M
Foundry goods[C
Liquid(t
1-t
2)+L+C
Gu(t
3-t
4)] η=M
Casting moldC
Casting moldΔ T is in the formula: M
Casting moldBe casting mold quality, M
Foundry goodsBe casting quality, t
1Be the pouring temperature of aluminium alloy, t
2Be the liquidus temperature of aluminium alloy, t
3Be the solidus temperature of alloy, t
4Be the calcining temperature of foundry goods, C
LiquidBe the average liquid specific heat appearance of alloy, L is the latent heat of fusion of alloy, C
GuBe the average solid-state specific heat capacity of alloy, C
Casting moldBe the solid-state specific heat capacity of casting mold, △ T is casting mold is elevated to maximum temperature from operating temperature temperature gap, i.e. △ T=T
Maximum temperature-T
The casting mold operating temperature, η is that the foundry goods heat dissipation capacity is cast the ratio that absorbs, and is generally 70%～80%.Can be found out by above-mentioned equation of heat balance, as high temperature physical parameter (the average solid-state specific heat capacity C of alloy of foundry goods and mold material
Gu, alloy average liquid specific heat hold C
Liquid, the latent heat of fusion L of alloy, the liquidus temperature t of alloy
2, alloy solidus temperature t
3, mold material solid-state specific heat capacity C
Casting moldAfter determining, just can calculate the temperature lift-off value △ T of centrifugal casting mould, thereby calculate the maximum temperature of casting mold.
But in actual applications, because kind and the trade mark of centrifugal casting are various, the high temperature physical property test of metal material implement relatively difficulty and Meteorological very high, if the high temperature physical property DATA REASONING of whole metal materials will be gone out, its Meteorological is that general researcher and enterprise is unaffordable.(the mechanical engineering society's foundry meeting of casting handbook, casting handbook the 3rd volume, the casting nonferrous alloy, China Machine Press's 2011 third editions) only record casting material the most commonly used and the high temperature physical property test data of mold material in, and it is not on the books for the high temperature physical data of common metal material, this just causes accurately estimating the casting mold maximum temperature, and the temperature foundation can not be provided for the strength check of casting mold.Present common processing method be treat that casting solidification, centrifuge are shut down after, open safety guard and observe the temperature that the rubescent color of casting mold is estimated casting mold, but at this moment the temperature of casting mold and casting mold maximum temperature differ greatly.
Summary of the invention
The evaluation method of casting mold maximum temperature when technical problem to be solved by this invention provides a kind of cheaply centrifugal casting, select by alloy materials classification and sample, high temperature physical data according to alloys in common use material incompleteness, to copper casting, ironcasting and carbon cast steel spare, in centrifugal casting process, the actual maximum temperature of casting mold is estimated.
For solving the problems of the technologies described above, technical scheme of the present invention is:
The evaluation method of casting mold maximum temperature comprises the steps: during a kind of centrifugal casting
According to the classification of casting material, select the sample trade mark of described casting material, with the average solid-state specific heat capacity C of the described sample trade mark
Gu, alloy average liquid specific heat hold C
Liquid, the latent heat of fusion L of alloy, the liquidus temperature t of alloy
2, alloy solidus temperature t
3High temperature physical data as described casting material;
Calculating the mold temperature lift-off value according to following mold temperature lift-off value formula is:
Get
Wherein, M
Casting moldBe casting mold quality, M
Foundry goodsBe casting quality, C
Casting moldSolid-state specific heat capacity for the casting quality type;
Mold temperature is divided into a plurality of temperature sampling points according to default temperature difference, calculates α value corresponding to each temperature sampling point temperature value;
Choose any one temperature sampling point temperature value as the first casting mold reduced temperature T
1, will with T
1Corresponding α value is brought in the formula (1), calculates the first mold temperature lift-off value △ T
1And the first casting mold maximum temperature T
2If, T
1With T
2The absolute value of difference is then chosen and T in the mold temperature scope greater than half of default temperature difference
2The temperature sampling point temperature value of temperature difference absolute value minimum is as the second casting mold reduced temperature, and the α value that the second casting mold reduced temperature is corresponding in the substitution formula (1), calculates the second mold temperature lift-off value △ T again
2And the second casting mold maximum temperature T
3, with T
3The maximum temperature of casting mold during as this centrifugal casting.
Preferably, the average liquid specific heat of described alloy holds C
LiquidBe average solid-state specific heat capacity C
Gu1.25～1.65 times.
Preferably, described casting mold specific heat capacity C
Casting moldData adopt linear regression method or curve-fitting method to calculate.
Preferably, when described preset temperature is poor when being 100 ℃, mold temperature is divided into a plurality of temperature sampling points according to 100 ℃ temperature difference, calculates the mold temperature scope with the α value in the time of 100 ℃; Choose any one temperature sampling point temperature value as the first casting mold reduced temperature, will with T
1Corresponding α value is brought in the formula (1), calculates the first mold temperature lift-off value △ T
1And the first casting mold maximum temperature T
2If, T
1With T
2The absolute value of difference is then chosen and T in the mold temperature scope greater than 50 ℃
2The temperature sampling point temperature value of temperature difference absolute value minimum is as the second casting mold reduced temperature, and the α value that the second casting mold reduced temperature is corresponding in the substitution formula (1), calculates the second mold temperature lift-off value △ T again
2And the second casting mold maximum temperature T
3, with T
3The maximum temperature of casting mold during as this centrifugal casting.
Preferably, when described preset temperature is poor when being 50 ℃, mold temperature is divided into a plurality of temperature sampling points according to 50 ℃ temperature difference, calculates the mold temperature scope with the α value in the time of 50 ℃; Choose any one temperature sampling point temperature value as the first casting mold reduced temperature T
1, will with T
1Corresponding α value is brought in the formula (1), calculates the first mold temperature lift-off value △ T
1And the first casting mold maximum temperature T
2If, T
1With T
2The absolute value of difference is then chosen and T in the mold temperature scope greater than 25 ℃
2The temperature sampling point temperature value of temperature difference absolute value minimum is as the second casting mold reduced temperature, and the α value that the second casting mold reduced temperature is corresponding in the substitution formula (1), calculates the second mold temperature lift-off value △ T again
2And the second casting mold maximum temperature T
3, with T
3The maximum temperature of casting mold during as this centrifugal casting.
Preferably, described mold temperature scope is 300 ℃～800 ℃ when described mold material is cast iron and carbon cast steel, and described mold temperature scope is 300 ℃～900 ℃ when described mold material is chromium molybdenum steel.
The invention has the beneficial effects as follows can be according to the high temperature physical data of existing foundry goods and mold material, estimates the actual maximum temperature of foundry goods centrifugal casting mould commonly used in mode cheaply; Thereby can be able to pour into a mould specific foundry goods to specific centrifugal casting mould judges; Also can provide the temperature foundation at the strength check to casting mold when the centrifugal casting mould generation is broken.
The specific embodiment
Embodiment 1:
Step a: the casting mold material that the present embodiment is selected is Gray Cast HT200, the mass M casting mold=2283kg of casting pig casting mold, and the operating temperature of casting pig casting mold is set as 70 ℃; The tin bronze casting calcining temperature is set as 350 ℃, and tin bronze casting is of a size of Ф 1358 ∕ Ф 1095 * 240mm, the mass M of tin bronze casting
Foundry goods=1095kg.Can find from the casting handbook: 8 trades mark are arranged in the tin bronze kind the GB, and the solid-state specific heat capacity peak of alloy is 396kJ/ (kg ℃), and minimum is 360kJ/ (kg ℃); The liquidus temperature t of aluminium alloy
2, peak is 1004 ℃, minimum is 976 ℃; The solidus temperature t of alloy
3, peak is 854 ℃, minimum is 837 ℃.Tin bronze ZCuSn10Zn2 is chosen as the sample trade mark, its average solid-state specific heat capacity C
Gu=0.376kJ ∕ (kg ℃), liquidus temperature t
2=1000 ℃, solidus temperature t
3=854 ℃, and can from other data (Zhang Yizhong, the casting of copper sheathing [J]. Special Processes of Metal Castings and non-ferrous alloy .1992(4)) in check in ZCuSn10Zn2 average liquid specific heat hold C
Liquid=0.607kJ ∕ (kg ℃), latent heat of fusion L=205kJ ∕ kg, so the high temperature physical data that the present embodiment is chosen tin bronze ZCuSn10Zn2 is the sample data of tin bronze kind.
Step b: from the casting handbook, can find Gray Cast HT200 at the solid-state specific heat capacity C of following each temperature and casting mold
Casting moldCorresponding relation between (kJ ∕ (kg ℃)) is: 300 ℃, and 0.557; 400 ℃, 0.565; 500 ℃, 0.586; 600 ℃, 0.607; 700 ℃, 0.641; 800 ℃, 0.691, the temperature interval difference is 100 ℃.
Step c: the heat dissipation capacity of establishing foundry goods 80% be cast absorb pouring temperature t
1=1080 ℃, casting mold calcining temperature t
4=350 ℃; Mold temperature is divided into five temperature sampling points according to 100 ℃ temperature difference, calculates α value corresponding to each temperature sampling point temperature value.Mold material is that cast iron mold temperature scope is 300 ℃～800 ℃, selects the casting mold maximum temperature to be 500 ℃ and makes a temperature sampling point, at this moment the solid-state specific heat capacity C of casting pig casting mold
Casting mold=0.586kJ ∕ (kg ℃) can try to achieve the temperature sampling point when being 500 ℃, the α value of tin bronze casting and the collocation of casting pig casting mold:
In like manner, when the temperature sampling point is 400 ℃, the α value of tin bronze casting and the collocation of casting pig casting mold:
In like manner, the corresponding relation that can calculate following each reduced temperature and α value is: 300 ℃, and 636.36; 600 ℃, 583.94; 700 ℃, 552.97; 800 ℃, 512.96.
When temperature sampling point difference is 100 ℃, accuracy is not high enough, further chooses the temperature sampling point in the mold temperature scope, and every adjacent temperature sampling point difference is 50 ℃, simultaneously with described α value interpolation processing every 100 ℃ time the, the α value of accounting temperature sampled point in the time of 50 ℃.The α value that can calculate the temperature sampling point and be 550 ℃ be 500 ℃ with 600 ℃ mean value 594.41, by that analogy, the temperature sampling point that obtains newly increasing with the corresponding relation of α value is: 350 ℃, 631.86; 450 ℃, 616.11; 550 ℃, 594.41; 650 ℃, 568.46; 750 ℃, 532.97.
Steps d: because the solid-state specific heat capacity of casting mold when different temperatures is different, therefore selecting the α value need to choose 500 ℃ of first casting mold reduced temperature of temperature sampling point T
1, α=604.87 were brought formula (1) into and can be calculated the first casting mold rising temperature value △ T when tin bronze casting and cast iron casting mold were arranged in pairs or groups during with 500 ℃
1:
For tin bronze casting, the work temperature of casting mold
The casting mold operating temperatureIt is 70 ℃, therefore the first casting mold maximum temperature T
2For
T
2=△ T
1+ T
The casting mold operating temperature=290+70=360 ℃
The the first casting mold maximum temperature T that calculates
2With the first casting mold reduced temperature T
1The phase difference is 140 ℃, greater than 25 ℃, then chooses and T in the casting mold operating temperature range
2The temperature sampling point value of temperature difference minimum namely 350 ℃ as the second casting mold reduced temperature, the α value 631.86 substitution formula (1) that the second casting mold reduced temperature is corresponding recomputate the second casting mold rising temperature value △ T
2:
The second casting mold maximum temperature T then
3=△ T
2+ T
The casting mold operating temperature=303+70=373 ℃, the second casting mold maximum temperature T that calculates
3Be 350 ℃ with the second casting mold reduced temperature and differ less than 25 ℃, then the casting mold maximum temperature is 373 ℃.
Embodiment 2
Step a: the casting mold material that the present embodiment is selected is chromium molybdenum steel ZG20CrMo, the mass M of chromium molybdenum steel casting mold
Casting mold=2810kg, the operating temperature of casting mold is set as 230 ℃.Choosing castings material carbon steel ZG230-450 is the sample trade mark, and the foundry goods calcining temperature is set as 820 ℃, and the ZG230-450 foundry goods is of a size of Ф 620 ∕ Ф 496 * 1300mm, the mass M of foundry goods
Foundry goods=1100kg.
The latent heat of fusion L=251.2kJ ∕ kg of carbon cast steel, liquidus temperature t
2=1525 ℃, solidus temperature t
3=1490 ℃.Get pouring temperature t
1=1580 ℃, foundry goods calcining temperature t
4=820 ℃.Can find on the handbook from casting, below the solid-state specific heat capacity C of each temperature and carbon cast steel ZG230-450 mold material
Casting mold(corresponding relation of kJ ∕ (kg ℃) is: 300 ℃, and 0.557; 350 ℃, 0.574; 400 ℃, 0.599; 450 ℃, 0.624; 500 ℃, 0.662; 550 ℃, 0.706; 600 ℃, 0.749; 650 ℃, 0.798; 700 ℃, 0.846; 750 ℃, 0.898; 800 ℃, 0.950.In the time of 800 ℃, the solid-state specific heat capacity C=0.950kJ ∕ (kg ℃) of ZG230-450 can think the average solid-state specific heat capacity of ZG230-450.The liquid specific heat that lacks in addition carbon cast steel holds C
Liquid, according to C
Liquid=(1.3～1.6) C
Gu, desirable C
Liquid=1.3 * 0.950=1.235kJ ∕ (kg ℃) is because C
Liquid(t
1-t
2) in (t
1-t
2) value little, even if C
LiquidEstimation has deviation, but also little on the impact of mold temperature T calculating.
Step b: the trade mark of chromium molybdenum steel casting mold is ZG20CrMo, but can't find relevant high temperature physical data on the cast steel handbook, from electromechanical engineering metal material handbook (Wan Jiali chief editor. Shanghai science tech publishing house, 1990. the 3rd edition) in can find the part high temperature physical data of chromium molybdenum steel ZG22CrMo, 7 temperature and solid-state specific heat capacity C are only arranged
Casting moldThe data of (kJ ∕ (kg ℃)) relation: 25 ℃, 0.419; 150 ℃, 0.496; 205 ℃, 0.477; 315 ℃, 0.507; 425 ℃, 0.536; 540 ℃, 0.557; 650 ℃, 0.586.Since optional without other data, can only select the solid-state specific heat capacity of ZG22CrMo as sample data.For find the solid-state specific heat capacity C of chromium molybdenum steel at handbook
Casting moldIncomplete data, can by analyzing, find out the regularity that data with existing shows, solid-state specific heat capacity C
Casting moldIncrease along with the rising of temperature, namely be very strong positive correlation, can pass through regression analysis, solve equation of linear regression, thus the completion data.Find the solid-state specific heat capacity C of 7 ZG22CrMo from handbook
Casting moldData because we needed be mold temperature T and solid-state specific heat capacity C more than 300 ℃
Casting moldRelation, adopt 205 ℃ and 5 above points to carry out linear regression analysis, the degree of accuracy is higher like this, tries to achieve solid-state specific heat capacity C
Casting TypeEquation of linear regression is
C
Casting mold=0.0002T+0.43
At this moment, R
209959, coefficient R=0.9980, correlation is very high.According to solid-state specific heat capacity CC
Casting moldEquation of linear regression can be calculated in 300 ℃～900 ℃ scopes solid-state specific heat capacity C:300 ℃ every 50 ℃ chromium molybdenum steel casting mold, 0.490; 350 ℃, 0.500; 400 ℃, 0.510; 450 ℃, 0.520; 500 ℃, 0.530; 550 ℃, 0.540; 600 ℃, 0.550; 650 ℃, 0.560; 700 ℃, 0.570; 750 ℃, 0.580; 800 ℃, 0.590; 850 ℃, 0.600; 900 ℃, 0.610.
Step c: the heat dissipation capacity of establishing foundry goods 80% be cast absorb pouring temperature t
1=1580 ℃, casting mold calcining temperature t
4=820 ℃; Choose the temperature sampling point in the mold temperature scope, difference is 50 ℃ between every temperature sampling point, calculates α value corresponding to each temperature sampling point.Temperature range was 300 ℃～900 ℃ when mold material was chromium molybdenum steel, take 500 ℃ of temperature sampling points as example, and the specific heat capacity C of chromium molybdenum steel casting mold
Casting moldKg ℃ of=0.530kJ ∕ can try to achieve in the time of 500 ℃, the α value of steel casting iron and the collocation of chromium molybdenum steel casting mold:
From calculate, can find out the liquid heat dissipation capacity C of foundry goods
Liquid(t
1-t
2)=67.93kJ ∕ kg is with respect to the solid-state heat dissipation capacity C of latent heat of fusion L=251.2kJ ∕ kg and foundry goods
Gu(t
3-t
4)=636.5kJ ∕ kg affects very little.
Equally, when 400 ℃ of temperature sampling points, the α value of steel casting iron and the collocation of chromium molybdenum steel casting mold:
In like manner, can calculate the corresponding relation of each temperature sampling point temperature and α value: 300 ℃, 1560.20; 350 ℃, 1529.00; 450 ℃, 1470.19; 550 ℃, 1415.74; 600 ℃, 1390.00; 650 ℃, 1365.18; 700 ℃, 1341.23; 750 ℃, 1318.10; 800 ℃, 1295.76; 850 ℃, 1274.16; 900 ℃, 1253.28.
Steps d: because the solid-state specific heat capacity of casting mold when different temperatures is different, therefore selecting the α value need to choose in advance 600 ℃ of temperature sampling points as the first casting mold reduced temperature T
1, α=1399.00 were brought formula (1) into and can be calculated the first casting mold rising temperature value △ T when tin bronze casting and cast iron casting mold were arranged in pairs or groups during with 600 ℃
1:
For steel casting iron, the work temperature of casting mold
The casting mold operating temperatureIt is 230 ℃, therefore the first casting mold maximum temperature T
2For
T
2=△ T
1+ T
The casting mold operating temperature=544+230=774(℃)
The the first casting mold maximum temperature T that calculates
2With the first casting mold reduced temperature T
1The phase difference is 174 ℃, differs by more than 25 ℃, then chooses and T in the casting mold operating temperature range
2The temperature sampling point value of temperature difference minimum namely 750 ℃ as the second casting mold reduced temperature, the α value 1318.10 that the second casting mold reduced temperature is corresponding again substitution formula (1) recomputates the second casting mold rising temperature value △ T
2:
The second casting mold maximum temperature T then
3=△ T
2+ T
The casting mold operating temperature=516+230=746 ℃, the second casting mold maximum temperature T that calculates
3Be 750 ℃ with the second casting mold reduced temperature and differ less than 25 ℃, then the casting mold maximum temperature is 746 ℃.
Certainly, adopt other different casting materials among the present invention, its corresponding casting mold operating temperature is desirable following value respectively:
For aluminium brone casting, the operating temperature of casting mold is generally 140 ℃～200 ℃; For brassing, the operating temperature of casting mold is generally 120 ℃～160 ℃.
For iron casting, when thermodyn process (being metal coating) was produced, the operating temperature of casting mold was generally 180 ℃～350 ℃.
For other different casting materials, corresponding foundry goods calcining temperature is also different among the present invention:
The calcining temperature of aluminium bronze, brassing is generally 400 ℃～600 ℃.
The calcining temperature of iron casting is generally 700 ℃～850 ℃.
Aluminium bronze, brass are got latent heat of fusion L=205kJ ∕ kg among the present invention;
Casting pig and spheroidal graphite cast-iron are got latent heat of fusion L=219.81kJ ∕ kg;
Mild steel, medium carbon steel are got latent heat of fusion L=251.2kJ ∕ kg.
The embodiment of the invention can be according to the high temperature physical data of existing foundry goods and mold material, estimates the actual maximum temperature of foundry goods centrifugal casting mould commonly used in mode cheaply; Thereby can be able to pour into a mould specific foundry goods to specific centrifugal casting mould judges; Also can provide the temperature foundation at the strength check to casting mold when the centrifugal casting mould generation is broken.
It should be noted last that, the above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. the evaluation method of casting mold maximum temperature during a centrifugal casting is characterized in that, comprises the steps:
According to the classification of casting material, select the sample trade mark of described casting material, with the average solid-state specific heat capacity C of the described sample trade mark
Gu, alloy average liquid specific heat hold C
Liquid, the latent heat of fusion L of alloy, the liquidus temperature t of alloy
2, alloy solidus temperature t
3High temperature physical data as described casting material;
Calculating the mold temperature lift-off value according to following mold temperature lift-off value formula is:
Get
Wherein, M
Casting moldBe casting mold quality, M
Foundry goodsBe casting quality, C
Casting moldSolid-state specific heat capacity for the casting quality type;
Mold temperature is divided into a plurality of temperature sampling points according to default temperature difference, calculates α value corresponding to each temperature sampling point temperature value;
Choose any one temperature sampling point temperature value as the first casting mold reduced temperature T
1, will with T
1Corresponding α value is brought in the formula (1), calculates the first mold temperature lift-off value △ T
1And the first casting mold maximum temperature T
2If, T
1With T
2The absolute value of difference is then chosen and T in the mold temperature scope greater than half of default temperature difference
2The temperature sampling point temperature value of temperature difference absolute value minimum is as the second casting mold reduced temperature, and the α value that the second casting mold reduced temperature is corresponding in the substitution formula (1), calculates the second mold temperature lift-off value △ T again
2And the second casting mold maximum temperature T
3, with T
3The maximum temperature of casting mold during as this centrifugal casting.
2. the evaluation method of casting mold maximum temperature during centrifugal casting according to claim 1 is characterized in that, the average liquid specific heat of described alloy holds C
LiquidBe average solid-state specific heat capacity C
Gu1.25～1.65 times.
3. the evaluation method of casting mold maximum temperature during centrifugal casting according to claim 1 is characterized in that described casting mold specific heat capacity C
Casting moldData adopt linear regression method or curve-fitting method to calculate.
4. the evaluation method of casting mold maximum temperature during centrifugal casting according to claim 1, it is characterized in that, when described preset temperature is poor when being 100 ℃, mold temperature is divided into a plurality of temperature sampling points according to 100 ℃ temperature difference, calculate the mold temperature scope with the α value in the time of 100 ℃; Choose any one temperature sampling point temperature value as the first casting mold reduced temperature T
1, will with T
1Corresponding α value is brought in the formula (1), calculates the first mold temperature lift-off value △ T
1And the first casting mold maximum temperature T
2If, T
1With T
2The absolute value of difference is then chosen and T in the mold temperature scope greater than 50 ℃
2The temperature sampling point temperature value of temperature difference absolute value minimum is as the second casting mold reduced temperature, and the α value that the second casting mold reduced temperature is corresponding in the substitution formula (1), calculates the second mold temperature lift-off value △ T again
2And the second casting mold maximum temperature T
3, with T
3The maximum temperature of casting mold during as this centrifugal casting.
5. the evaluation method of casting mold maximum temperature during centrifugal casting according to claim 1, it is characterized in that, when described preset temperature is poor when being 50 ℃, mold temperature is divided into a plurality of temperature sampling points according to 50 ℃ temperature difference, calculate the mold temperature scope with the α value in the time of 50 ℃; Choose any one temperature sampling point temperature value as the first casting mold reduced temperature T
1, will with T
1Corresponding α value is brought in the formula (1), calculates the first mold temperature lift-off value △ T
1And the first casting mold maximum temperature T
2If, T
1With T
2The absolute value of difference is then chosen and T in the mold temperature scope greater than 25 ℃
2The temperature sampling point temperature value of temperature difference absolute value minimum is as the second casting mold reduced temperature, and the α value that the second casting mold reduced temperature is corresponding in the substitution formula (1), calculates the second mold temperature lift-off value △ T again
2And the second casting mold maximum temperature T
3, with T
3The maximum temperature of casting mold during as this centrifugal casting.
6. the evaluation method of casting mold maximum temperature during centrifugal casting according to claim 1 and 2,
It is characterized in that, described mold temperature scope is 300 ℃～800 ℃ when described mold material is cast iron and carbon cast steel, and described mold temperature scope is 300 ℃～900 ℃ when described mold material is chromium molybdenum steel.
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| CN106040981A (en) * | 2016-08-16 | 2016-10-26 | 辽源市福源重型矿山机械制造有限公司 | Pouring system for sand casting |
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