CN115629103A - Method for measuring heating coefficient of metal material and application - Google Patents
Method for measuring heating coefficient of metal material and application Download PDFInfo
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- CN115629103A CN115629103A CN202211309066.XA CN202211309066A CN115629103A CN 115629103 A CN115629103 A CN 115629103A CN 202211309066 A CN202211309066 A CN 202211309066A CN 115629103 A CN115629103 A CN 115629103A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 118
- 239000007769 metal material Substances 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000000523 sample Substances 0.000 claims abstract description 63
- 238000004321 preservation Methods 0.000 claims abstract description 37
- 229910052751 metal Inorganic materials 0.000 claims description 68
- 239000002184 metal Substances 0.000 claims description 68
- 238000005553 drilling Methods 0.000 claims description 11
- 239000010425 asbestos Substances 0.000 claims description 7
- 229910052895 riebeckite Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- 230000000052 comparative effect Effects 0.000 description 9
- 239000002344 surface layer Substances 0.000 description 7
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- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
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- 239000000956 alloy Substances 0.000 description 1
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- 238000004364 calculation method Methods 0.000 description 1
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- 238000005242 forging Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
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Abstract
The invention provides a method for measuring the heating coefficient of a metal material, which comprises the following steps: preparing metal material samples with different specifications; measuring the core temperature of the metal material sample; measuring the time for the core of the metallic sample material to reach a target temperature; calculating the heating coefficients of the metal material samples with different specifications; and calculating the heating coefficients of other intermediate specification metal material samples. The invention provides a method for accurately measuring the heating coefficient of a metal material, and the air heat preservation time of a certain specification or a certain metal material with similar specification in a heating furnace with certain heating power can be accurately calculated according to an empirical formula (namely the air heat preservation time = the heating coefficient multiplied by the minimum heat treatment thickness).
Description
Technical Field
The invention belongs to the technical field of heating, and particularly relates to a method for measuring a heating coefficient of a metal material and application thereof
Background
At present, before metal hot working (including forging, extrusion, rolling and the like), heat preservation treatment (air heat preservation or metal heat preservation) is carried out at a certain temperature for a certain time, and the purpose is to enable the temperature of a surface layer and the temperature of a core part of a metal material to be uniform. The existing technical scheme for calculating the heat preservation time mainly comprises two types: firstly, embedding a thermocouple into the surface layer of the metal material or a position close to the surface layer, and starting to calculate the metal heat preservation time when the temperature of the metal surface layer reaches a target temperature; the method has the disadvantages that when the temperature of the metal surface layer reaches the target temperature, the metal core part of the metal surface layer does not actually reach the target temperature, so that the method has great error in calculating the heat preservation time, and great time, labor and thermocouple cost are required for embedding the thermocouple. Secondly, the air heat preservation time is calculated according to an empirical formula, namely the air heat preservation time = heating coefficient multiplied by minimum heat treatment thickness, while the heating coefficient is usually obtained according to the experience of skilled workers at present, but heating furnaces with different heating powers and alloys with different brands influence the height of the heating coefficient, so that the method can cause the insufficient heat preservation time or the overlong heat preservation time of the metal material.
Disclosure of Invention
In view of this, the present invention provides a method for measuring a heating coefficient of a metal material and an application thereof.
The invention provides a method for measuring the heating coefficient of a metal material, which comprises the following steps:
preparing metal material samples with different specifications;
measuring the core temperature of the metal material sample;
measuring the time for the core of the metallic sample material to reach a target temperature;
calculating the heating coefficients of the metal material samples with different specifications;
and calculating the heating coefficients of other intermediate specification metal material samples.
Preferably, the shape of the metal material sample is cylindrical;
the sizes of the metal material samples with different specifications are selected from phi 100 x 100mm, phi 200 x 200mm, phi 300 x 300mm, phi 400 x 400mm, phi 500 x 500mm, phi 600 x 600mm, phi 700 x 700mm, phi 800 x 800mm, phi 1000 x 1000mm, phi 1200 x 1200mm and phi 1350 x 1350mm.
Preferably, the method of measuring the core temperature of a metallic material sample includes:
drilling a hole in the center of the end face of the metal material sample, wherein the hole diameter is larger than the diameter of the adopted thermocouple, and the hole depth is half of the height of the metal material sample;
embedding the calibrated thermocouple into the hole to enable the end of the thermocouple to contact the metal of the core part of the metal material sample, and then plugging the hole with asbestos;
and (3) putting the metal material sample into a heating furnace, connecting a thermocouple into the calibrated polling instrument, and reading the temperature of the core part of the metal material sample.
Preferably, the furnace gas temperature is increased to a target temperature through furnace gas temperature control software, the time when the furnace gas temperature reaches the target temperature is used as a timing starting point, heat preservation is carried out, the time when the thermocouple of the core part of the metal sample material reaches the target temperature is recorded, and minutes are used as a timing unit; the heat preservation time is longer than the longest time for the thermocouple to reach the target temperature.
Preferably, the heating coefficient of the metal sample material is as follows:
k = time to target temperature of the core of the metal sample material/minimum heat treatment thickness.
Preferably, the heating coefficients of the other intermediate-specification metal sample materials are calculated by an interpolation method according to the obtained heating coefficients of the metal sample materials.
Preferably, the time for the core of metallic sample material to reach the target temperature is extended;
the extension time is 1 to 3 hours.
Preferably, the method for measuring the heating coefficient of the metal material comprises the following steps:
the first step is as follows: manufacturing metal material samples with specific specification and size, wherein the metal material samples comprise phi 100 x 100mm, phi 200 x 200mm, phi 300 x 300mm, phi 400 x 400mm, phi 500 x 500mm, phi 600 x 600mm, phi 700 x 700mm, phi 800 x 800mm, phi 1000 x 1000mm, phi 1200 x 1200mm and phi 1350 x 1350mm in different specifications;
the second step: drilling holes in the centers of the end faces of the metal round bar samples, wherein the hole diameter must be larger than the diameter of the embedded thermocouple, and the drilling depth is half of the height;
the third step: embedding the calibrated thermocouples into holes of all metal round bar samples to ensure that the ends of the thermocouples are in contact with the metal of the core part of the samples, and then fully plugging and plugging the holes with asbestos so as to reduce the influence of air heat transfer on the metal temperature of the core part;
the fourth step: putting the metal round bar sample into a heating furnace with certain heating power, and simultaneously connecting a thermocouple into a calibrated polling instrument so as to read the temperature of the core part of the metal round bar sample;
the fifth step: closing the furnace door, raising the temperature of the furnace gas to a certain target temperature through furnace gas temperature control software, taking the time when the temperature of the furnace gas reaches the target temperature as a timing starting point, preserving the temperature for a long time, and keeping the temperature for a time longer than the time from the last thermocouple to the temperature, respectively recording the time when the thermocouple of the sample core part reaches the target temperature, wherein the time is phi 100 x 100mm, phi 200 x 200mm, phi 300 x 300mm, phi 400 x 400mm, phi 500 x 500mm, phi 600 x 600mm, phi 700 x 700mm, phi 800 x 800mm, phi 1000 x 1000mm, phi 1200 x 0mm and phi 1350 x 1350mm, and taking the minute as a timing unit, wherein the time is t 1 、t 2 、t 3 、t 4 、t 5 、t 6 、t 7 、t 8 、t 9 、t 10 、t 11 ；
And a sixth step: calculating the heating coefficient k, k = heat preservation time/minimum heat treatment thickness, k, of the metal samples with different specifications 1 ＝t 1 /100、k 2 ＝t 2 /200、k 3 ＝t 3 /300、k 4 ＝t 4 /400、k 5 ＝t 5 /500、k 6 ＝t 6 /600、k 7 ＝t 7 /700、k 8 ＝t 8 /800、k 9 ＝t 9 /1000、k 10 ＝t 10 /1200、k 11 ＝t 11 /1350；
The seventh step: heating coefficient k of other intermediate specification metal materials x The heating coefficient can be calculated by interpolation.
The invention provides a method for testing air heat preservation time of a metal material, which comprises the following steps:
t＝k x *L；
k x testing the heating coefficient of the obtained metal material by the method in the technical scheme;
and L is the minimum heat treatment thickness of the metal material.
Preferably, the metal material is an aluminum alloy.
The invention can accurately measure the heating coefficient of the metal material sample with specific specification and size by manufacturing some metal materials with specific specification and size (namely different minimum heat treatment thickness), and accurately obtain the heating coefficients of the other metal materials with intermediate specification and size by an interpolation method, namely, the air heat preservation time of a certain metal material with certain specification or approximate specification in a heating furnace with certain heating power can be accurately calculated according to an empirical formula (namely the air heat preservation time = heating coefficient multiplied by minimum heat treatment thickness).
The invention provides a method for accurately measuring the heating coefficient of a metal material, and meanwhile, the air heat preservation time required when the core part of the metal material reaches the target temperature when the metal material with a certain specification is heated in a heating furnace with a certain power, namely the air heat preservation time = the heating coefficient multiplied by the minimum heat treatment thickness, can be accurately calculated.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for measuring the heating coefficient of a metal material, which comprises the following steps:
preparing metal material samples with different specifications;
measuring the core temperature of the metal material sample;
measuring the time for the core of the metallic sample material to reach a target temperature;
calculating the heating coefficients of the metal material samples with different specifications;
and calculating the heating coefficients of other intermediate specification metal material samples.
The composition of the metallic material sample according to the present invention is not particularly limited, and a metallic material known to those skilled in the art may be used, and preferably an aluminum alloy, such as 2219 aluminum alloy.
In the present invention, the shape of the metallic material sample is preferably cylindrical; the dimensions of the metallic material samples of different specifications are preferably selected from Φ 100 × 100mm (diameter × height), Φ 200 × 200mm, Φ 300 × 300mm, Φ 400 × 400mm, Φ 500 × 500mm, Φ 600 × 600mm, Φ 700 × 700mm, Φ 800 × 800mm, Φ 1000 × 1000mm, Φ 1200 × 1200mm, Φ 1350 Φ 1350mm.
In the present invention, the method of measuring the core temperature of a metallic material sample preferably includes:
drilling a hole in the center of the end face of the metal material sample, wherein the hole diameter is larger than the diameter of the adopted thermocouple, and the hole depth is half of the height of the metal material sample;
embedding the calibrated thermocouple into the hole, enabling the end of the thermocouple to contact the metal of the core part of the metal material sample, and then plugging the hole with asbestos to reduce the influence of air heat transfer on the temperature of the metal of the core part;
a metal material sample method such as a heating furnace is connected to a calibrated polling instrument, and the temperature of the core part of the metal material sample is read.
In the invention, preferably, the furnace gas temperature is increased to the target temperature through furnace gas temperature control software, the time when the furnace gas temperature reaches the target temperature is taken as a timing starting point, the temperature is preserved, the time when the thermocouple at the core part of the metal sample material reaches the target temperature is recorded, and minutes are taken as a timing unit; the time for the incubation needs to be longer than the maximum time for the thermocouple to reach the target temperature.
In the present invention, the heating coefficient refers to the total heating time required for heating a unit thickness of a metal material to a certain temperature, and is expressed in units of "minutes per millimeter", i.e., "min/mm". In the present invention, the heating coefficient of the metal sample material is:
k = time to target temperature of the metal sample material core/minimum heat treatment thickness.
In the present invention, the minimum heat treatment thickness means the shortest heat transfer distance of a metal material in order to heat the core portion of the metal material through, and if the specification size of a certain metal material is 300mm × 200mm × 100mm (length × width × height), the minimum heat treatment thickness is 100mm.
In the present invention, the heating coefficient of the other intermediate specification metal sample material can be calculated by interpolation, such as the metal material with the minimum heat treatment thickness of 750mm (the heating coefficient of the metal material with the specification is defined as k) x ) The heating coefficient (k) of phi 700 x 700mm and phi 800 x 800mm metal samples can be determined 7 、k 8 ) The following formula is obtained by interpolation:
k is obtained from the above formula x ＝(k 7 +k 8 )/2。
The invention provides a method for testing air heat preservation time of a metal material, which comprises the following steps:
t＝k x *L；
k x testing the heating coefficient of the obtained metal material by the method in the technical scheme;
and L is the minimum heat treatment thickness of the metal material.
In the present invention, the method for measuring the heating coefficient and the air insulation time of the metal material preferably comprises:
the first step is as follows: preparing metal material samples with specific specification and size, such as phi 100 × 100mm (diameter × height), phi 200 × 200mm, phi 300 × 300mm, phi 400 × 400mm, phi 500 × 500mm, phi 600 × 600mm, phi 700 × 700mm, phi 800 × 800mm, phi 1000 × 1000mm, phi 1200 × 1200mm, and phi 1350 × 1350mm;
the second step: respectively drilling holes in the centers of the end faces of the metal round bar samples, wherein the hole diameter must be larger than the diameter of the embedded thermocouple, and the drilling depth is half of the height;
the third step: embedding the calibrated thermocouples into the holes of the metal round bar samples to ensure that the ends of the thermocouples contact the metal of the core part of the sample, and fully plugging and tightly plugging the holes by using asbestos so as to reduce the influence of air heat transfer on the temperature of the metal of the core part;
the fourth step: putting the metal round bar sample into a heating furnace with certain heating power, and simultaneously connecting a thermocouple into a calibrated polling instrument so as to read the temperature of the core part of the metal round bar sample;
the fifth step: closing the furnace door, raising the temperature of the furnace gas to a certain target temperature (such as 510 ℃) through furnace gas temperature control software, taking the time when the temperature of the furnace gas reaches the target temperature as a timing starting point, preserving the temperature for a long time (the time is longer than the time when the temperature reaches the last thermocouple), and respectively recording the time when the thermocouple cores of the samples of phi 100 x 100mm (diameter x height), phi 200 x 200mm, phi 300 x 300mm, phi 400 x 400mm, phi 500 x 500mm, phi 600 x 600mm, phi 700 x 700mm, phi 800 x 800mm, phi 1000 x 1000mm, phi 1200 x 0mm and phi 1350 x 1350mm reach the target temperature (taking minutes as timing units), wherein the time is t 1 、t 2 、t 3 、t 4 、t 5 、t 6 、t 7 、t 8 、t 9 、t 10 、t 11 ；
And a sixth step: calculating the heating coefficient (k, unit is minute per millimeter, namely min/mm) of the metal samples with different specifications (different minimum heat treatment thicknesses), and k = the holding time/the minimum heat treatment thickness, namely k 1 ＝t 1 100 (it)Middle k 1 Heating coefficient of phi 100 x 100mm metal sample, and so on), k 2 ＝t 2 /200、k 3 ＝t 3 /300、k 4 ＝t 4 /400、k 5 ＝t 5 /500、k 6 ＝t 6 /600、k 7 ＝t 7 /700、k 8 ＝t 8 /800、k 9 ＝t 9 /1000、k 10 ＝t 10 /1200、k 11 ＝t 11 /1350；
The seventh step: heating coefficient k of other intermediate specification metal materials x Can be calculated by interpolation based on the above heating coefficients, such as the minimum heat treatment thickness of 750mm (defining the heating coefficient of the metal material of the specification as k) x ) The heating coefficient (k) of phi 700 x 700mm and phi 800 x 800mm metal samples can be determined 7 、k 8 ) The following formula is obtained by interpolation:
k is obtained from the above formula x ＝(k 7 +k 8 )/2。
Eighth step: on the premise of not damaging the metal material, the air heat preservation time of the metal material with the same minimum heat treatment thickness in the heating furnace is deduced to be t = k x * l, wherein l is the minimum heat treatment thickness of the metal material.
In the present invention, the holding time is preferably a time taken for the core of the metal sample material to reach the target temperature and then extended by a certain time as a calculation time of the heating coefficient, the extended time is preferably 1 to 3 hours, and more preferably 2 hours, and the temperature uniformity of the metal core and the surface layer can be improved by extending the certain time.
The invention provides a method for accurately measuring the heating coefficient of a metal material, and the air heat preservation time of a certain specification or a certain metal material with similar specification in a heating furnace with certain heating power can be accurately calculated according to an empirical formula (namely the air heat preservation time = the heating coefficient multiplied by the minimum heat treatment thickness).
The invention obtains the heating coefficients of the metal materials with different specifications by a comparison method and an interpolation method, manufactures the metal material samples with different specifications, forms an analogy with the same specification and the same type of metal materials with the same specification charged in the future, and the heating coefficients are reasonably the same; interpolation method: the heating coefficient of the metal material with the specific specification is obtained by manufacturing a metal material sample with a certain specific specification and testing, and the heating coefficient of the metal material with the intermediate specification can be deduced by a mathematical method (namely an interpolation method) by covering other intermediate specification sizes with two adjacent specific specification sizes. The method provided by the invention can calculate the air heat preservation time of the same type of metal materials in the same type of heating furnace without damaging the metal materials by only measuring the heating coefficients of the metal materials with different specifications for the first time.
In the following examples and comparative examples of the present invention, 2219 aluminum alloy metal samples of Φ 100 × 100mm (diameter × height), Φ 200 × 200mm, Φ 300 × 300mm, Φ 400 × 400mm, Φ 500 × 500mm, Φ 600 × 600mm, Φ 700 × 700mm, Φ 800 × 800mm, Φ 1000 × 1000mm, Φ 1200 × 1200mm, and Φ 1350 × 1350mm specifications were prepared, respectively, and the target temperatures were heated to 510 ± 5 ℃.
Example 1
And respectively drilling holes in the centers of the end faces of the metal samples, wherein the hole diameter must be larger than the diameter of the embedded thermocouple, the drilling depth is half of the height, the calibrated thermocouple is embedded into the hole of each metal sample, the end of the thermocouple is ensured to be in contact with the metal of the core part of the sample, and the hole is fully plugged and plugged by asbestos so as to reduce the influence of air heat transfer on the metal temperature of the core part. When the heating furnace is heated, the air heat preservation time when the temperature of each core thermocouple reaches the target temperature is respectively recorded, and the corresponding heating coefficient is calculated according to the air heat preservation time.
The detection result is as follows:
comparative example 1
Taking the minimum value of 1.5min/mm according to the empirical heating coefficient (usually 1.5-3.0 min/mm), calculating the air heat preservation time required by each specification of metal samples to be respectively 150min, 300min, 450min, 600min, 750min, 900min, 1050min, 1200min, 1500min, 1800min and 2025min, and respectively recording the temperature reading of the core thermocouple when the corresponding heat preservation time is reached.
The detection result is as follows:
comparative example 2
When the maximum value of 3.0min/mm is taken according to the empirical heating coefficient (usually 1.5-3.0 min/mm), the air heat preservation time required by each specification of the metal sample is respectively 300min, 600min, 900min, 1200min, 1500min, 1800min, 2100min, 2400min, 3000min, 3600min and 4050min, and when the corresponding heat preservation time is reached, the temperature reading of the thermocouple at the core part of the metal sample is respectively recorded.
The detection result is as follows:
comparative example 3
Respectively pressing a thermocouple on the surface of a metal sample by using a metal pressing block or a heat-resistant brick to enable the tip of the thermocouple to be tightly attached to the metal, wherein the temperature measured by the thermocouple is the surface temperature of the metal; when the furnace is heated, when the temperature of the thermocouple on the surface of each metal sample reaches the target temperature, the temperature reading of the thermocouple at the core part of the metal sample is respectively recorded, the air heat preservation time at the time is recorded, and then the heating coefficient is calculated.
The detection result is as follows:
as can be seen from the examples and comparative examples, the air-holding time in the comparative example was deviated to some extent from the actual core-warming time.
The empirical heating coefficient of comparative example 1 was too low (except for Φ 100 × 100 ingot), resulting in insufficient heating time of the metal material, lack of core heat penetration, and failure of the metal core to reach the target temperature at the end of the hold. The experimental heating coefficient of comparative example 2 is too large, which results in too long heat preservation time of the metal material, and the core part reaches the target temperature early, thus causing energy waste. Comparative example 3 is a case where the core temperature is actually regarded as the surface temperature of the metal in order to prevent the metal material from being damaged during the actual operation, which results in the core not being heated through, and the core not reaching the target temperature at the end of the heat retention.
The method provided by the invention can accurately measure the heating coefficient and calculate the accurate air heat preservation time. Can save energy or avoid insufficient heating of metal materials. The metal material is destroyed only for the first time, and the metal material charged in the furnace is not destroyed in the future.
While the invention has been described and illustrated with reference to specific embodiments thereof, such description and illustration are not intended to limit the invention. It will be clearly understood by those skilled in the art that various changes may be made to adapt a particular situation, material, composition of matter, substance, method or process to the objective, spirit and scope of this application without departing from the true spirit and scope of the invention as defined by the appended claims. All such modifications are intended to be within the scope of the claims appended hereto. Although the methods disclosed herein have been described with reference to particular operations performed in a particular order, it should be understood that these operations may be combined, sub-divided, or reordered to form equivalent methods without departing from the teachings of the present disclosure. Accordingly, unless specifically indicated herein, the order and grouping of the operations is not a limitation of the present application.
Claims (10)
1. A method of measuring the heating coefficient of a metallic material, comprising:
preparing metal material samples with different specifications;
measuring the core temperature of the metal material sample;
measuring the time for the core of the metallic sample material to reach a target temperature;
calculating the heating coefficients of the metal material samples with different specifications;
and calculating the heating coefficients of other intermediate specification metal material samples.
2. The method according to claim 1, wherein the metallic material specimen is cylindrical in shape;
the sizes of the metal material samples with different specifications are selected from phi 100 x 100mm, phi 200 x 200mm, phi 300 x 300mm, phi 400 x 400mm, phi 500 x 500mm, phi 600 x 600mm, phi 700 x 700mm, phi 800 x 800mm, phi 1000 x 1000mm, phi 1200 x 1200mm and phi 1350 x 1350mm.
3. The method of claim 1, wherein the method of measuring the core temperature of the metallic material sample comprises:
drilling a hole in the center of the end face of the metal material sample, wherein the hole diameter is larger than the diameter of the adopted thermocouple, and the hole depth is half of the height of the metal material sample;
embedding the calibrated thermocouple into the hole to enable the end of the thermocouple to contact the metal of the core part of the metal material sample, and then plugging the hole with asbestos;
and (3) putting the metal material sample into a heating furnace, connecting a thermocouple into the calibrated polling instrument, and reading the temperature of the core part of the metal material sample.
4. The method according to claim 1, characterized in that the furnace gas temperature is raised to a target temperature through furnace gas temperature control software, when the furnace gas temperature reaches the target temperature, the furnace gas temperature is kept as a timing starting point, the time for the thermocouple at the core part of the metal sample material to reach the target temperature is recorded, and minutes are taken as a timing unit; the heat preservation time is longer than the longest time for the thermocouple to reach the target temperature.
5. The method of claim 1, wherein the metal coupon material has a heating coefficient of:
k = time to target temperature of the metal sample material core/minimum heat treatment thickness.
6. The method of claim 1, wherein the heating coefficients of the other intermediate gauge metal sample materials are calculated by interpolation from the heating coefficients of the already obtained metal sample materials.
7. The method of claim 5, wherein the metal sample material core reaches a target temperature for an extended period of time;
the extension time is 1 to 3 hours.
8. The method of claim 1, wherein the method of measuring the heating coefficient of a metallic material comprises:
the first step is as follows: preparing metal material samples with specific specification and size, wherein the metal material samples comprise different specifications of phi 100 x 100mm, phi 200 x 200mm, phi 300 x 300mm, phi 400 x 400mm, phi 500 x 500mm, phi 600 x 600mm, phi 700 x 700mm, phi 800 x 800mm, phi 1000 x 1000mm, phi 1200 x 1200mm and phi 1350 x 1350mm;
the second step is that: drilling holes in the centers of the end faces of the metal round bar samples, wherein the hole diameter must be larger than the diameter of the embedded thermocouple, and the drilling depth is half of the height;
the third step: embedding the calibrated thermocouples into holes of all metal round bar samples to ensure that the ends of the thermocouples are in contact with the metal of the core part of the samples, and then fully plugging and plugging the holes with asbestos so as to reduce the influence of air heat transfer on the metal temperature of the core part;
the fourth step: putting the metal round bar sample into a heating furnace with certain heating power, and simultaneously connecting a thermocouple into a calibrated polling instrument so as to read the temperature of the core part of the metal round bar sample;
the fifth step: closing the furnace door, raising the temperature of the furnace gas to a certain target temperature through furnace gas temperature control software, taking the time when the temperature of the furnace gas reaches the target temperature as a timing starting point, preserving the temperature for a long time, and recording the temperature time of the furnace gas which is greater than the temperature time of the last thermocouple, wherein the temperature time of the furnace gas is 100 x 100mm, 200 x 200mm, 300 x 300mm, 400 x 400mm, 500 x 500mm, 600 x 600mm and 700 x 70The time for the core thermocouples of 0mm, Φ 800 × 800mm, Φ 1000 × 1000mm, Φ 1200 × 1200mm, Φ 1350 × 1350mm to reach the target temperature is represented by t in minutes as a timing unit 1 、t 2 、t 3 、t 4 、t 5 、t 6 、t 7 、t 8 、t 9 、t 10 、t 11 ；
And a sixth step: calculating the heating coefficient k, k = heat preservation time/minimum heat treatment thickness, k, of the metal samples with different specifications 1 ＝t 1 /100、k 2 ＝t 2 /200、k 3 ＝t 3 /300、k 4 ＝t 4 /400、k 5 ＝t 5 /500、k 6 ＝t 6 /600、k 7 ＝t 7 /700、k 8 ＝t 8 /800、k 9 ＝t 9 /1000、k 10 ＝t 10 /1200、k 11 ＝t 11 /1350；
The seventh step: heating coefficient k of other intermediate specification metal materials x The heating coefficient can be calculated by interpolation.
9. A method for testing air heat preservation time of a metal material comprises the following steps:
t＝k x *L；
k x testing the resulting metallic material for the heating coefficient according to the method of claim 1;
and L is the minimum heat treatment thickness of the metal material.
10. The method of claim 1 or claim 9, wherein the metallic material is an aluminum alloy.
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| CN111474204A (en) * | 2020-04-28 | 2020-07-31 | 西安工业大学 | Method for testing heat conductivity coefficient of cylindrical sample by punching method |
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