CN103484657A - Water quenching time correction method at different initial water temperatures - Google Patents
Water quenching time correction method at different initial water temperatures Download PDFInfo
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Abstract
The invention provides a water quenching time correction method at different initial water temperatures. The method comprises the following concrete steps: (1) determining a water quenching technology or a water-air alternative quenching technology at a standard temperature; (2) determining a correction coefficient of the water quenching time, wherein the correction coefficient changes along with a change of the initial water temperature; (3) calculating the corrected water quenching time according to the formula, t[correction]=K*t[standard]; (4) executing quenching process according to the corrected technology; (5) carrying out performance detection and statistical estimation on the product processed according to the corrected quenching technology, and then correcting the temperature correction coefficient according to the estimation result. The water quenching time correction method at different initial water temperatures disclosed by the invention has important significance on avoidance of water quenching cracking and reduction of product performance fluctuation.
Description
Technical field
The present invention relates to a kind of quench cooled technique, particularly, relate to the shrend time correcting method under the initial water temperature of a kind of difference.
Background technology
Quenching is that quenching part is heated to austenitic temperature, then is cooled fast to certain temperature following to obtain the process of martensite or bainite structure.For fear of producing quenching crack, steel alloy generally adopts oil quenching, and less employing shrend.The steel alloy shrend generally adopts martemper or water-sky alternately to quench and avoids the generation of cracking.Therefore, the key problem in technology of steel alloy shrend is the time of controlling shrend and air cooling, namely accurately carries out alternately time quenching process for cooling of water-sky.
Through the prior art literature search is found, Chen Nailu, Zuo Xunwei, Xu Jun, Zhang Weimin. the research of digitally timed quenching process for cooling and equipment and application. metal heat treatmet, 2009,34 (3): the 37-42 article proposes alternately time quenching process for cooling of water-sky.Concrete grammar is to divide three phases to carry out quench cooled, and the first stage is the precooling stage, and subordinate phase is that water-sky replaces the quench cooled stage, and the phase III is the natural air cooling stage.In the precooling stage, alloy steel piece takes the mode of air cooling to carry out Slow cooling, until the alloy steel piece surface cool to A1 above or following a certain temperature range, consequently reduced the thermal capacity of alloy steel piece, the cooling performance that has accelerated subordinate phase.Replace the quench cooled stage at water-sky, adopt cold (water-cooled) soon to carry out with the mode that slow cooling (air cooling) replaces, alloy steel piece is in shrend process for the first time, and the alloy steel piece top layer obtains partial martensite after being as cold as soon the following a certain temperature of Ms point and keeping certain hour on top layer; Alloy steel piece is in process air cooler for the first time, the heat on inferior top layer passes to top layer, the temperature on top layer is raise, and result is that the martensite generation self-tempering that top layer has just changed is adjusted the toughness on top layer and stressed condition, has avoided the top layer martensitic stucture to produce cracking.And then the alternately quench cooled of repetition water and air, until the temperature at a certain position of alloy steel piece or tissue reach requirement.After completing the subordinate phase quench cooled, alloy steel piece is placed in air and carries out naturally cooling, until the heart section temperature of alloy steel piece is carried out tempering after lower than a certain value.Document technology is for avoiding the alloy steel piece cracking that positive effect is arranged, but, the document does not relate to the initial water temperature of shrend to shrend time effects content, and initial water temperature has significant impact to the cooling intensity of water, consider that this factor of initial water temperature has important meaning to avoiding steel alloy shrend cracking and reducing the product performance fluctuation.
Summary of the invention
For the prior art above shortcomings, the object of the present invention is to provide the shrend time correcting method under the initial water temperature of a kind of difference, the method is accurately to formulate alternately quench cooled technique of water quenching technology, particularly water-sky, significant.
For realizing above purpose, the invention provides the shrend time correcting method under the initial water temperature of a kind of difference, the concrete steps of described method are as follows:
(1) the alternately quench cooled technique of water quenching technology at temperature or water-sky that settles the standard, described standard temperature is the predefined initial water temperature value (it can be 20 ℃, can be also 10 ℃, or other temperature) of quenching;
(2) determine the correction factor of shrend time, this correction factor changes with initial water temperature: when initial water temperature during higher than standard temperature correction factor be greater than 1, when initial water temperature during lower than standard temperature correction factor be less than 1;
(3) calculate revised shrend time, t according to formula
revise=K*t
standard
In formula: t
revisefor the revised shrend time, K is temperature correction coefficient, t
standardfor the shrend time under standard temperature;
(4) carry out the quench cooled process according to revised technique;
(5) product of processing according to revised quenching technology is carried out to Performance Detection, statistical estimation, then again temperature correction coefficient is revised according to assessment result.
Preferably, described temperature correction coefficient obtains by following one or more method synthesis:
Method one, cooling characteristic curve method
The method is according to ISO9950 (Standard Test Method for Determination of Cooling Characteristics of Quench Oils by Cooling Curve Analysis) international standard or the cooling characteristic curve of other standard test under different water temperatures, then to measuring sonde, the cooling rate curve in a certain temperature range carries out integration respectively, draw the area value under a certain temperature range cooling rate, draw respectively in this way the area value under different water temps; Using the area value of standard temperature as molecule, the area value under different water temperatures is made denominator, draws the temperature correction coefficient under different water temperatures.
Method two: coefficient of heat transfer method
The method is similar to method one, and difference is the described cooling rate curve of method one to be changed into to the coefficient of heat transfer curve of present method.
Method three: Method for Numerical
At first obtain the coefficient of heat transfer under different water temperatures by measurements and calculations, then for a certain concrete water temperature, specific product and concrete position, carry out the numerical simulation in temperature field, draw the time that is reduced to a certain temperature, this asynchronism(-nization) under different water temperatures; Time under standard temperature is done to denominator, and the time molecule under different water temperatures, draw the temperature correction coefficient under different water temperatures.
Method four: experience estimation method
For the product of batch production, the performance statistics according to quenching product under different water temperatures, draw temperature correction coefficient.
Preferably: described modification method is applicable to water, salt solution and all kinds of water-soluble medium.
Preferably: described modification method is applicable to traditional shrend, water-sky alternately quench cooled and all kinds of intermittent type quench cooled.
Compared with prior art, the present invention has following beneficial effect:
Shrend time correcting method under the initial water temperature of a kind of difference of the present invention, the method is accurately to formulate alternately quench cooled technique of water quenching technology, particularly water-sky, to avoiding the shrend cracking and reducing the product performance fluctuation, important meaning is arranged.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
Embodiment 1
Certain alloy steel piece shrend draws by test: when water temperature is 20 ℃, when soaking time is 240s, can obtain the product performance that meet the demands; Now water temperature is 30 ℃, in order to guarantee alloy steel piece acquisition and the 20 ℃ of water temperatures identical performance of quenching of quenching under the water temperature of 30 ℃, need to be adjusted soaking time.
The temperature correction coefficient obtained by the cooling characteristic curve method is 1.10, according to shrend Time Calculation formula: t after revising
revise=K*t
standardcalculate, the soaking time when water temperature is 30 ℃ should be 264s; According to this time alloy steel part, soaked cooling, i.e. 20 ℃ of product performance close with soaking time 240s of acquisition and water temperature.
Embodiment 2
Certain alloy steel piece adopts the alternately quench cooled technique quenching of water-sky, and technique when water temperature is 20 ℃ is: water-cooled 120s+ air cooling 150s+ water-cooled 180s+ air cooling 200s+ water-cooled 150s.Technique when requirement provides water temperature and is 15 ℃.
The temperature correction coefficient obtained by coefficient of heat transfer method is 0.95, according to shrend Time Calculation formula: t after revising
revise=K*t
standardcalculate, the technique when water temperature is 15 ℃ is: water-cooled 114s+ air cooling 150s+ water-cooled 171s+ air cooling 200s+ water-cooled 143s; Carry out quench cooled according to this technique alloy steel part, obtaining with water temperature is the product performance that in 20 ℃ of situations, art breading is close.
Embodiment 3
Certain alloy steel piece adopts the polymer class water-soluble medium to quench, and by test, draws: when medium temperature is 20 ℃, when the immersion liquid time is 320s, can obtain the product performance that meet the demands; Now medium temperature is 40 ℃, in order to guarantee alloy steel piece acquisition and the 20 ℃ of medium temperatures identical performance of quenching of quenching under the medium temperature of 40 ℃, need to be adjusted the immersion liquid time.
The temperature correction coefficient obtained by experience estimation method is 1.25, according to cool time calculation formula: t after revising
revise=K*t
standardcalculate, the immersion liquid time when medium temperature is 40 ℃ should be 400s; Carry out immersion liquid according to this time alloy steel part cooling, obtaining with medium temperature is that 20 ℃ of situation immersion liquid times are the product performance that 320s is close.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (4)
1. the shrend time correcting method under the initial water temperature of difference, is characterized in that, the concrete steps of described method comprise:
(1) the alternately quench cooled technique of water quenching technology at temperature or water-sky that settles the standard, described standard temperature is the predefined initial water temperature value of quenching;
(2) determine the correction factor of shrend time, this correction factor changes with initial water temperature: when initial water temperature during higher than standard temperature correction factor be greater than 1, when initial water temperature during lower than standard temperature correction factor be less than 1;
(3) calculate revised shrend time, t according to formula
revise=K*t
standard
In formula: t
revisefor the revised shrend time; K is temperature correction coefficient; t
standardfor the shrend time under standard temperature;
(4) carry out the quench cooled process according to revised technique;
(5) product of processing according to revised quenching technology is carried out to Performance Detection, statistical estimation, then again temperature correction coefficient is revised according to assessment result.
2. the shrend time correcting method under the initial water temperature of a kind of difference according to claim 1, is characterized in that, described temperature correction coefficient obtains by following one or more method synthesis:
Method one, cooling characteristic curve method
The method is that establishing criteria is determined at the cooling characteristic curve under different water temperatures, then to measuring sonde, the cooling rate curve in a certain temperature range carries out integration respectively, draw the area value under a certain temperature range cooling rate, draw respectively in this way the area value under different water temps; Using the area value of standard temperature as molecule, the area value under different water temperatures is made denominator, draws the temperature correction coefficient under different water temperatures;
Method two, coefficient of heat transfer method
The method is similar to method one, and difference is to change the described cooling rate curve of method one into coefficient of heat transfer curve;
Method three, Method for Numerical
At first obtain the coefficient of heat transfer under different water temperatures by measurements and calculations, then for a certain concrete water temperature, specific product and concrete position, carry out the numerical simulation in temperature field, draw the time that is reduced to a certain temperature, this asynchronism(-nization) under different water temperatures; Time under standard temperature is done to denominator, and the time molecule under different water temperatures, draw the temperature correction coefficient under different water temperatures;
Method four, experience estimation method
For the product of batch production, the performance statistics according to quenching product under different water temperatures, draw temperature correction coefficient.
3. according to the shrend time correcting method under the initial water temperature of the described a kind of difference of claim 1 or 2, it is characterized in that, described modification method is applicable to water, salt solution and all kinds of water-soluble medium.
4. according to the shrend time correcting method under the initial water temperature of the described a kind of difference of claim 1 or 2, it is characterized in that, described modification method is applicable to traditional shrend, water-sky alternately quench cooled and all kinds of intermittent type quench cooled.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108315534A (en) * | 2018-05-10 | 2018-07-24 | 二重（德阳）重型装备有限公司 | Liquid air alternately quenches control method |
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| US20060213588A1 (en) * | 2005-03-23 | 2006-09-28 | Ntn Corporation | Induction heat treatment method, induction heat treatment installation and induction-heat-treated product |
| CN102344998A (en) * | 2011-07-21 | 2012-02-08 | 南京迪威尔重型锻造股份有限公司 | Method for determining quenching soaking time of shaft parts |
| CN102605145A (en) * | 2012-04-12 | 2012-07-25 | 王长文 | Steel isothermal quenching-tempering cooling technology |
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| US20060213588A1 (en) * | 2005-03-23 | 2006-09-28 | Ntn Corporation | Induction heat treatment method, induction heat treatment installation and induction-heat-treated product |
| CN102344998A (en) * | 2011-07-21 | 2012-02-08 | 南京迪威尔重型锻造股份有限公司 | Method for determining quenching soaking time of shaft parts |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108315534A (en) * | 2018-05-10 | 2018-07-24 | 二重（德阳）重型装备有限公司 | Liquid air alternately quenches control method |
| CN108315534B (en) * | 2018-05-10 | 2019-08-23 | 二重（德阳）重型装备有限公司 | Liquid air alternately quenches control method |
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