CN111257368A - Testing arrangement of quenching medium thermal stability - Google Patents
Testing arrangement of quenching medium thermal stability Download PDFInfo
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- CN111257368A CN111257368A CN202010123010.XA CN202010123010A CN111257368A CN 111257368 A CN111257368 A CN 111257368A CN 202010123010 A CN202010123010 A CN 202010123010A CN 111257368 A CN111257368 A CN 111257368A
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- quenching medium
- thermal stability
- quenching
- induction coil
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention discloses a device for testing the thermal stability of a quenching medium, which comprises an experimental container, the quenching medium to be tested arranged in the experimental container and a cooling device for cooling the experimental container; the quenching medium quenching device also comprises a measuring sensor arranged in the quenching medium to be measured, wherein the measuring sensor consists of an induction coil and a standard probe arranged at the geometric center of the induction coil; the device also comprises an induction power supply electrically connected with the induction coil and a control unit connected with the standard probe through a cable, and the control unit is connected with the induction power supply through the cable. The testing device controls the induction power supply to be turned on and off by acquiring the temperature of the standard probe, thereby realizing multiple high-temperature thermal shock on the quenching medium.
Description
Technical Field
The invention relates to a device for testing the thermal stability of a quenching medium, belonging to the technical field of metal processing oil.
Background
In the field of industrial quenching, additives are often added to the quenching medium in order to meet different cooling rate requirements. Under the continuous cycle quenching working condition, the temperature of the workpiece contacted with the quenching medium instantly can reach 850 ℃ or even higher. Under such thermal shock, part of the additive may be consumed by heat, thereby failing to secure the cooling rate requirement. In addition, quenching oil is used as a quenching medium for a large number of applications, and the main component of the quenching oil is that base oil is oxidized and aged when the base oil is contacted with a high-temperature workpiece. Therefore, the test evaluation of the stability of the quenching medium under the thermal shock condition and the tracking of the change condition of each relevant index of the quenching medium under the thermal shock condition have important significance for the development and application of the quenching medium.
The existing quenching oil thermal stability test method mainly comprises a thermal oxidation stabilizer test method, a rotary oxygen bomb method and the like. The methods are different from the actual use working condition of thermal shock of a quenching oil high-temperature workpiece, and the aging condition of a quenching medium at a high-temperature stage (above 850 ℃) cannot be simulated. Meanwhile, the methods cannot feed back the cooling characteristics of the quenching oil in real time. In addition, for the heating mode of the workpiece, the power of the common resistance heating mode is low, so that the quenching medium is easily overheated and boiled in the test process, the workpiece cannot reach high temperature, and certain potential safety hazard exists. If high-temperature workpiece drop-out impact is adopted, the requirement of automatic circulation is difficult to meet, and hundreds of thermal shock experiments of quenching media are difficult to simulate.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems in the prior art, the invention provides a device for testing the thermal stability of a quenching medium, which can simulate multiple high-temperature thermal shock to the quenching medium in actual industrial and mining, so that the thermal stability of the quenching medium to be tested is evaluated by measuring the cooling characteristics and the viscosity of the quenching medium to be tested in each stage before, during and after heating.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a test device for the thermal stability of a quenching medium comprises an experimental container, the quenching medium to be tested arranged in the experimental container and a cooling device used for cooling the experimental container; the quenching medium quenching device also comprises a measuring sensor arranged in the quenching medium to be measured, wherein the measuring sensor consists of an induction coil and a standard probe arranged at the geometric center of the induction coil; the device also comprises an induction power supply electrically connected with the induction coil and a control unit connected with the standard probe through a cable, and the control unit is connected with the induction power supply through the cable.
Wherein, the experimental container is a stainless steel beaker with an opening at the top, is used for placing a quenching medium to be detected, and is connected with the plate heat exchanger through a pagoda head and a hose.
Wherein, cooling device includes water chiller and plate heat exchanger, and the water chiller carries out the heat exchange through plate heat exchanger and experiment container, is equipped with the booster pump at plate heat exchanger and experiment container's connecting line, forms the circulative cooling return circuit through the booster pump.
Wherein, the standard probe is a probe specified by GB/T30823 standard or SH/T0220 standard.
The diameter of the cross section of the wire used by the induction coil is 3-8 mm, the inner diameter of the coil is 15-25 mm, the number of turns of the coil is 6-12, and the height of the coil is 80-150 mm.
The induction coil is rolled in a mode that two ends are dense and the middle is sparse, namely, the interval between adjacent turns at two ends of the induction coil is 0.1-0.2 mm, and the interval between adjacent turns in the middle of the induction coil is 3-5 mm.
Wherein, the induction heating power supply is connected with 380V three-phase alternating current.
The control unit comprises a central processing chip, a display module and a data acquisition module, wherein the display module and the data acquisition module are connected with the central processing chip; the control unit is connected with the display screen through a cable.
The working principle of the quenching medium thermal stability testing device is as follows: when a stainless steel beaker is used for testing the thermal stability of a quenching medium to be tested in a laboratory, a measuring sensor is placed in the quenching medium, a control unit controls an induction power supply to start heating, a stable steam film (the heat conduction of the steam film is slow, and the heat conduction rate is not a heating rate block, so that the standard probe can be integrally heated to 850 ℃ under the existence of the steam film) is formed on the surface of the standard probe within a short time when the induction power supply is switched on (the input power of the induction power supply is more than 8KW at the moment) through a specific induction coil structure, and finally the standard probe is cooled when the integral temperature of the standard probe in the quenching medium reaches 850 ℃ (a workpiece generally contacts the quenching medium to start quenching from 850 ℃ in the quenching process), the control unit controls the induction power supply to stop heating, and the quenching medium cools the standard probe, the control unit collects the real-time temperature of the standard probe and displays the corresponding data on the display screen.
The testing device controls the on and off of the induction power supply by collecting the temperature of the standard probe, thereby realizing multiple high-temperature thermal shock to the quenching medium (simulating actual industrial and mining).
The quenching medium subjected to multiple high-temperature thermal shocks is subjected to cooling performance detection by a cooling characteristic tester, and the viscosity of the quenching medium is sampled and detected, so that the thermal stability of the quenching medium is evaluated by measuring the cooling characteristics and the viscosity of the quenching medium at each stage before, during and after heating. Therefore, the device can simulate real industrial and mining thermal shock for the quenching medium, and further obtain the thermal stability of the quenching medium under the thermal shock condition and track the change condition of each relevant index of the quenching medium under the thermal shock condition.
Has the advantages that: the device for testing the thermal stability of the quenching medium can realize the rapid temperature rise of a heating workpiece (a standard probe) through the induction heating of high specific surface power, thereby realizing the high-temperature thermal shock to the quenching medium, realizing the multiple high-temperature thermal shock to the quenching medium through repeated heating, and evaluating the thermal stability of the quenching medium through the cooling characteristic and the viscosity of the quenching medium under the obtained high-temperature thermal shock; the testing device for the thermal stability of the quenching medium can simulate the actual working condition of high-temperature thermal shock of the quenching medium, so that the application risk of the quenching medium is effectively reduced.
Drawings
FIG. 1 is a system schematic diagram of the quenching medium thermal stability testing device of the invention;
FIG. 2 is a schematic diagram of a control unit;
fig. 3 is a schematic structural diagram of the induction coil.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the specific embodiment.
As shown in fig. 1 to 3, the device for testing the thermal stability of the quenching medium comprises an experimental container 1 and a quenching medium 11 to be tested, which is arranged in the experimental container 1; the experimental container 1 is an open stainless steel beaker with the volume of 2L and is used for placing a quenching medium 11 to be measured, the shell is fixedly connected with a pagoda head 8, the pagoda head 8 is connected with a hose 14, the experimental container 1 is connected with a plate heat exchanger 9 through the pagoda head 8 and the hose 14, a booster pump 10 is arranged on a connecting pipeline between the plate heat exchanger 9 and the experimental container 1, and a circulation loop is formed between the plate heat exchanger 9 and the experimental container 1 through the booster pump 10; the test device for the thermal stability of the quenching medium also comprises a cooling device, wherein the cooling device comprises a water cooler 12 and a plate type heat exchanger 9, and the water cooler 12 exchanges heat with the experimental container 1 through the plate type heat exchanger 9; the water cooler 12 cools the quenching medium through the plate heat exchanger 9, and meanwhile, the booster pump 10 is utilized to ensure the active circulation of a quenching medium cooling loop, so that the use amount of the quenching medium is reduced under the condition of ensuring the full heat exchange of the quenching medium; the device for testing the thermal stability of the quenching medium also comprises a measuring sensor 2 arranged in the quenching medium 11 to be tested, wherein the measuring sensor 2 consists of an induction coil 3 and a standard probe 4 arranged at the geometric center of the induction coil 3, namely the standard probe 4 and the induction coil 3 are fixed together to form the measuring sensor 2 which is immersed in the quenching medium 11 to be tested; the device for testing the thermal stability of the quenching medium further comprises an induction power supply 5 electrically connected with the induction coil 3 and a control unit 6 connected with the standard probe 4 through a cable, wherein the control unit 6 is simultaneously connected with the induction power supply 5 through the cable; wherein, the standard probe 4 used by the invention is a nickel alloy probe specified by the GB/T30823 standard.
The invention relates to a device for testing the thermal stability of a quenching medium, which is used for testing the thermal stability of the quenching medium, wherein electric wire turns at two ends of an induction coil 3 are very dense (namely the vertical distance between adjacent electric wires at the two ends of the coil is 0.1-0.2 mm), electric wire turns at the middle part of the induction coil are sparse (namely the vertical distance between adjacent electric wires at the middle part of the coil is 3-5 mm), the induction coil 2 is bound in such a way that the upper part and the lower part of the coil are compensated, so that the two ends of a standard probe 4 have larger specific surface power, the problem of uneven heating temperature caused by high cooling speed at the two ends is compensated, the induction coil 3 requires that the section diameter A of the electric wire is 3-8 mm, the inner diameter B of the coil (a circle surrounded by the electric wire) is 15-25 mm, the number of turns of the coil is 6-12, and the height C of the coil is 80-150 mm, the larger and more complete steam film formed on the surface of the standard probe 3 is, so that the heating temperature at each position is more balanced, and the thermocouple reaction in the standard probe is the integral temperature of the standard probe (rather than the local temperature at the thermocouple), so that the temperature transmitted by the thermocouple to the data acquisition module is more real and reliable.
The induction power supply 5 is connected with 380V three-phase alternating current, the effective output power is more than 8Kw, high-frequency oscillation current can be output, and the working frequency range is 30KHz-100 KHz. The specific surface power of the surface of the standard probe 4 can be ensured by the induction power supply 5, the output oscillation power of the induction power supply 5 is greater than 20Kw, and the effective output power is greater than 8 Kw. Meanwhile, the induction power supply 5 is provided with a cooling unit, and the cooling unit adopts double-channel water cooling or oil cooling to cool the induction power supply 5, so that the IGBT driver and the related devices are prevented from being damaged by overheating. The data acquisition module in the control unit 6 acquires the temperature of the standard probe 4, controls the induction power supply 5 to be switched on and off through the temperature of the standard probe 4, and displays the temperature on the display screen 7. The control unit 6 is connected with the induction power supply 5, the control unit 6 judges the temperature of the current standard probe 4 according to the input thermocouple signal, the induction power supply 5 is closed when the temperature of the standard probe 4 is higher than the set upper limit, and the induction power supply 5 is started when the temperature of the standard probe 4 is lower than the set lower limit, so that automatic cycle thermal shock is realized.
The control unit 6 of the invention comprises a central processing chip, a display module and a data acquisition module which are connected with the central processing chip; the control unit is connected with the display screen 7 through a cable, and the display screen 7 can display the monitored temperature of the quenching medium in real time.
The test device of the invention is adopted to evaluate the thermal stability of the quenching medium: the quenching medium cooling characteristic and the viscosity change before and after the experiment are used as reference bases for thermal stability evaluation.
In order to compare the same quick quenching oil, one antioxidant component A is switched into the same type of additive B, and under the condition that the addition proportion and other components are not changed, the thermal stability of the oil product is changed. The experimental process parameters were as follows: the lower limit of the temperature of the power switch is set as 80 ℃ according to the common working condition, the upper limit is set as 850 ℃ which is the typical value of the heating temperature of the workpiece, the experimental condition is 8 hours, and the cooling characteristic and the viscosity of the quenching medium are detected once every two hours before, after and during the experiment. The results are shown in Table 1.
TABLE 1 test results
Through the experiment, the viscosity, the maximum cooling speed and the upper characteristic temperature of the oil containing the additive A are reduced faster than those of the oil containing the additive B along with continuous thermal shock, and the cooling speed at 300 ℃ is increased faster, so that the thermal stability of the oil by the additive A is not good as that of the additive B. Meanwhile, in order to verify the accuracy of the testing device, the oil product used in the production field is supplemented with the additive B according to the result, and the cold speed maintaining period is obviously longer than that of the oil product added with the additive A through tracking confirmation.
The testing device can automatically and continuously carry out high-temperature thermal shock on the quenching medium, is convenient for detecting the viscosity and the cooling characteristic of the quenching medium before, during and after the experiment, so as to obtain the aging process of the quenching medium close to the practical working condition and the performance change trend in the process, and further evaluate the thermal stability of the quenching medium more suitable for practical use. Therefore, the device can be used for testing and evaluating the thermal stability condition of the quenching medium under the continuous high-temperature thermal shock condition.
Claims (8)
1. A testing arrangement of quenching medium thermal stability which characterized in that: comprises an experimental container, a quenching medium to be tested and a cooling device, wherein the quenching medium to be tested is arranged in the experimental container; the quenching medium quenching device also comprises a measuring sensor arranged in the quenching medium to be measured, wherein the measuring sensor consists of an induction coil and a standard probe arranged at the geometric center of the induction coil; the device also comprises an induction power supply electrically connected with the induction coil and a control unit connected with the standard probe through a cable, and the control unit is connected with the induction power supply through the cable.
2. The quenching medium thermal stability test device according to claim 1, wherein: the experimental container is a stainless steel beaker with an opening at the top.
3. The quenching medium thermal stability test device according to claim 1, wherein: the cooling device comprises a water cooler and a plate heat exchanger, the water cooler exchanges heat with the experimental container through the plate heat exchanger, and a booster pump is arranged on a connecting pipeline of the plate heat exchanger and the experimental container.
4. The quenching medium thermal stability test device according to claim 1, wherein: the standard probe is a probe specified by GB/T30823 standard or SH/T0220 standard.
5. The quenching medium thermal stability test device according to claim 1, wherein: the diameter of the cross section of the wire used by the induction coil is 3-8 mm, the inner diameter of the coil is 15-25 mm, the number of turns of the coil is 6-12, and the height of the coil is 80-150 mm.
6. The quenching medium thermal stability test device according to claim 1, wherein: the interval between adjacent turns at two ends of the induction coil is 0.1-0.2 mm, and the interval between adjacent turns in the middle of the induction coil is 3-5 mm.
7. The quenching medium thermal stability test device according to claim 1, wherein: the induction heating power supply is connected with 380V three-phase alternating current.
8. The quenching medium thermal stability test device according to claim 1, wherein: the control unit comprises a central processing chip, a display module and a data acquisition module, wherein the display module and the data acquisition module are connected with the central processing chip; the control unit is connected with the display screen through a cable.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010123010.XA CN111257368A (en) | 2020-02-27 | 2020-02-27 | Testing arrangement of quenching medium thermal stability |
| PCT/CN2020/081333 WO2021168961A1 (en) | 2020-02-27 | 2020-03-26 | Test device for thermal stability of quenching medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010123010.XA CN111257368A (en) | 2020-02-27 | 2020-02-27 | Testing arrangement of quenching medium thermal stability |
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| CN111257368A true CN111257368A (en) | 2020-06-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114354680A (en) * | 2021-12-08 | 2022-04-15 | 东风汽车集团股份有限公司 | PAG quenching medium cooling performance analysis method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS60107563A (en) * | 1983-11-16 | 1985-06-13 | Idemitsu Kosan Co Ltd | Method and device for evaluating cooling performance of heat treating agent |
| JP3124506B2 (en) * | 1997-03-14 | 2001-01-15 | 白光株式会社 | Heater / sensor complex |
| CN104597080A (en) * | 2015-01-27 | 2015-05-06 | 河海大学常州校区 | System and method for testing cooling performance of quenching medium based on ZigBee |
| CN204514891U (en) * | 2015-03-12 | 2015-07-29 | 郑州科慧科技股份有限公司 | A kind of for hardening media cooling performance determination data pen recorder |
| CN204882428U (en) * | 2015-07-08 | 2015-12-16 | 天津市热处理研究所有限公司 | A detecting system for hardening media |
| CN106566919A (en) * | 2015-10-10 | 2017-04-19 | 十堰双齐科技有限公司 | Device for monitoring PAG water base quenching medium cooling performance on line |
| CN206291973U (en) * | 2016-12-27 | 2017-06-30 | 南京科润新材料技术有限公司 | A kind of wireless hardening media temperature acquisition system of high frequency |
| CN207650133U (en) * | 2017-12-28 | 2018-07-24 | 南京科润新材料技术有限公司 | A kind of cooling characteristics test device based under Android system |
| CN208736822U (en) * | 2018-09-06 | 2019-04-12 | 王晓民 | A kind of cooling ability of quenchants analyzer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114354680A (en) * | 2021-12-08 | 2022-04-15 | 东风汽车集团股份有限公司 | PAG quenching medium cooling performance analysis method |
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