CN113234914A - Gradient heat treatment furnace based on accurate temperature control of heating gas and heat treatment method - Google Patents
Gradient heat treatment furnace based on accurate temperature control of heating gas and heat treatment method Download PDFInfo
- Publication number
- CN113234914A CN113234914A CN202110410196.1A CN202110410196A CN113234914A CN 113234914 A CN113234914 A CN 113234914A CN 202110410196 A CN202110410196 A CN 202110410196A CN 113234914 A CN113234914 A CN 113234914A
- Authority
- CN
- China
- Prior art keywords
- air
- disc
- shaped workpiece
- heat treatment
- furnace body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 138
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 35
- 238000009413 insulation Methods 0.000 claims abstract description 24
- 238000005485 electric heating Methods 0.000 claims abstract description 23
- 238000005507 spraying Methods 0.000 claims description 18
- 230000006835 compression Effects 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 11
- -1 iron-chromium-aluminum Chemical compound 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 abstract description 2
- 230000000630 rising effect Effects 0.000 abstract 1
- 238000003825 pressing Methods 0.000 description 6
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/34—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tyres; for rims
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
Abstract
The application relates to a gradient heat treatment furnace and a heat treatment method based on accurate temperature control of heated gas, belonging to the technical field of heat treatment of metal materials, wherein the gradient heat treatment furnace comprises: the furnace comprises an upper furnace body, a lower furnace body, a hot air circulation assembly, a heat insulation assembly and an air cooling assembly; a hot air heating assembly is arranged in the upper cavity of the upper furnace body; an annular electric heating assembly for heating the wheel rim is arranged in the lower cavity of the lower furnace body; the heat insulation assembly separates the rim part and the hub part of the disc-shaped workpiece; the hot air circulation component outputs the air heated by the hot air heating component to the upper surface and the lower surface of the hub part of the disc-shaped workpiece for heating; the air cooling assembly sends cooling air into the hub heating area to adjust the heating temperature of the hub part; a plurality of thermocouples are arranged in the lower furnace body. The gradient heat treatment furnace has the advantages of high gradient interface and temperature control accuracy, high temperature rising speed and high temperature uniformity.
Description
Technical Field
The application relates to the technical field of metal material heat treatment, in particular to a gradient heat treatment furnace and a heat treatment method based on accurate temperature control of heating gas.
Background
In the service process of the high-temperature alloy turbine disk part, the hub part and the wheel rim part are required to have grain structures with different sizes due to the difference of temperature impact and stress load. The hub part is required to have a smaller grain size (the grain size of the hub is 10-11 grade) due to high stress and low temperature, so that high yield strength, tensile strength and low cycle fatigue performance are ensured; the wheel rim part bears low stress and high temperature, and is required to have a coarse grain size (the grain size of the wheel rim is 5-6) grade so as to ensure high durability, high creep strength and high damage tolerance capability, and thus, the optimal mechanical property is obtained.
The above-mentioned structural properties require a gradient heat treatment of the turbine disk, which is contrary to the conventional heat treatment furnace for obtaining a uniform temperature field, and requires different heat treatment processes for different portions of the disk-shaped workpiece, and also requires precise control of the transition interface between the gradient heat treatment of the rim portion and the hub portion. In the related art, the gradient heat treatment device for the disc-shaped workpiece is used for cooling by respectively arranging a cooling box on an upper furnace body and a lower furnace body and filling heat-conducting salt, and the furnace wall is provided with a resistance band for realizing heating, so that the gradient heat treatment device can only carry out heat treatment with large temperature gradient.
In view of the above related technologies, the inventor believes that the heat treatment process only can be performed on a disc-shaped workpiece with a large temperature gradient, and cannot meet the process requirements of the heat treatment process with a small temperature gradient, and for some disc-shaped workpieces, the large temperature gradient easily causes stress concentration and fracture of the disc-shaped workpieces.
Disclosure of Invention
In order to solve the problem of large temperature gradient in the gradient heat treatment process in the related technology, the application provides a gradient heat treatment furnace and a heat treatment method based on accurate temperature control of heating gas.
In a first aspect, the present application provides a gradient heat treatment furnace based on accurate temperature control of heated gas, which adopts the following technical scheme:
a gradient heat treatment furnace based on accurate temperature control of heating gas comprises:
the device comprises an upper furnace body, a lower furnace body, a hot air circulation assembly and an air cooling assembly;
an upper cavity is formed in the upper furnace body, and a hot air heating assembly for heating air is arranged in the upper cavity;
a lower cavity is formed in the lower furnace body, and an annular electric heating assembly for heating the rim part of the disc-shaped workpiece is arranged in the lower cavity;
the lower cavity is also internally provided with a heat insulation assembly which is used for isolating the rim part and the hub part of the disc-shaped workpiece;
the hot air circulation component can output air heated by the hot air heating component to the upper surface and the lower surface of the hub part of the disc-shaped workpiece for heating;
the air cooling assembly is used for sending cooling air into the hub heating area to adjust the heating temperature of the hub part;
a plurality of thermocouples are inserted into the lower furnace body and are used for measuring the temperature of the rim part and the hub part of the disc-shaped workpiece.
By adopting the technical scheme, the disc-shaped workpiece can be subjected to heat treatment with different temperature gradients according to the process requirements of the disc-shaped workpiece, the temperature rise speed of the disc-shaped workpiece is high, the temperature is uniform, and the temperature control precision is high.
Optionally, the hot air circulation assembly includes a plenum chamber disposed in the upper furnace body and located at the upper part of the upper furnace body, a high temperature circulation fan is disposed in the plenum chamber, an air inlet of the high temperature circulation fan is connected with an air suction barrel, and the air suction barrel penetrates through the upper furnace body and is communicated with the hub heating region;
the bottom wall of the air compression chamber is provided with a plurality of air outlet pipes communicated with the upper chamber, the lower end of the upper chamber is provided with a plurality of upper air spraying pipes communicated with the upper chamber, and air in the air compression chamber is sprayed to the upper surface of the hub part of the disc-shaped workpiece through the air outlet pipes, the upper chamber and the upper air spraying pipes;
the side wall of the air pressing chamber is connected with a circulating air pipe, the tail end of the circulating air pipe in the air flow direction is connected with a lower air spraying pipe, and air in the air pressing chamber is sprayed to the lower surface of the hub part of the disc-shaped workpiece through the circulating air pipe and the lower air spraying pipe.
By adopting the technical scheme, the upper surface and the lower surface of the hub part can be simultaneously heated, and the consistency of the heating speed and the uniformity of the temperature are improved.
Optionally, the upper air spraying pipe and the lower air spraying pipe are uniformly distributed along the radial direction and the circumferential direction relative to the surface of the disc-shaped workpiece by taking the axis of the air suction barrel as an axis.
By adopting the technical scheme, the temperature uniformity of the hub part of the disc-shaped workpiece can be improved.
Optionally, the circulating air duct includes an upper duct body located in the upper furnace body and connected to the side wall of the air-pressing chamber, and a lower duct body disposed in the lower furnace body, and the upper duct body is communicated with the lower duct body.
Optionally, the heat insulation assembly comprises an upper heat insulation cylinder and a lower heat insulation cylinder;
the upper heat insulation cylinder is positioned between the disc-shaped workpiece and the upper furnace body and sleeved outside the upper air spraying pipe;
the lower heat insulation cylinder is positioned between the disc-shaped workpiece and the inner surface of the bottom of the lower furnace body.
By adopting the technical scheme, the rim part and the hub part of the disc-shaped workpiece can be separated so as to realize gradient heat treatment of the rim part and the hub part.
Optionally, the hot air heating assembly includes a plurality of iron-chromium-aluminum heating belts uniformly distributed along the circumferential direction of the side wall of the upper cavity;
the annular electric heating assembly comprises a plurality of iron-chromium-aluminum heating belts which are uniformly distributed along the circumferential direction of the side wall of the lower cavity.
In a second aspect, the present application further provides a gradient heat treatment method using the aforementioned gradient heat treatment furnace, which adopts the following technical scheme:
a gradient heat treatment method comprising:
step S1: step S1, charging: separating the upper furnace body from the lower furnace body, placing the disc-shaped workpiece in the lower furnace body, and covering the upper furnace body on the lower furnace body;
step S2, gradient heat treatment: starting the annular electric heating assembly to heat the rim part of the disc-shaped workpiece, simultaneously starting the hot air circulation assembly and the hot air heating assembly to heat the hub part of the disc-shaped workpiece, and simultaneously heating the rim part and the hub part of the disc-shaped workpiece to a set temperature; starting the air cooling assembly, keeping the temperature of the rim part of the disc-shaped workpiece constant, continuously heating the rim part of the disc-shaped workpiece to a target temperature by the annular electric heating assembly, and keeping the temperature for reaching the heat treatment time;
step S3, discharging: and after the disc-shaped workpiece is naturally cooled to room temperature, separating the upper furnace body from the lower furnace body and taking out the disc-shaped workpiece.
Optionally, in step S2, the annular electric heating assembly heats the rim portion of the disc-shaped workpiece with a temperature deviation of no more than 10 ℃ in a direction of inward transition of the rim portion.
Optionally, the rim portion and the hub portion of the disc-shaped workpiece are heated simultaneously for a time period of 3-6 h.
Optionally, the temperature difference between the upper and lower surfaces of the disc-shaped workpiece is ± 20 ℃ during heating.
In summary, the present application has at least one of the following advantages:
1. the gradient heat treatment furnace provided by the application can meet the heat treatment requirements of large temperature gradient and small temperature gradient of the disc-shaped workpiece at the same time, and is high in applicability;
2. the temperature rise speed of the disc-shaped workpiece is high, the temperature consistency of the upper surface and the lower surface is strong and more uniform, and the temperature control precision is high;
3. the control precision of the gradient heat treatment interface is high.
Drawings
FIG. 1 is a schematic three-dimensional structure of a gradient heat treatment furnace according to the present application;
FIG. 2 is a schematic sectional view of a gradient heat treatment furnace according to the present invention;
fig. 3 is a partially enlarged view of a portion a in fig. 2.
Description of reference numerals: 1. an upper furnace body; 11. an upper cavity; 2. a lower furnace body; 21. a lower cavity; 3. a support platform; 4. a hot air heating assembly; 5. an annular electric heating assembly; 61. A wind compression chamber; 62. a high temperature circulating fan; 63. an air suction cylinder; 64. an air outlet pipe; 65. a support plate; 66. an upper air spraying pipe; 67. a circulating air duct; 671. a pipe body is arranged; 672. a lower pipe body; 68. an air outlet chamber; 69. a lower air spraying pipe; 71. an upper heat insulation cylinder; 72. a lower heat insulation cylinder; 8. an air-cooling assembly; 81. a cooling fan; 82. cooling the air pipe; 83. adjusting a valve; 9. a disc-shaped workpiece; 100. and a thermocouple.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
Referring to fig. 1 and 2, the embodiment of the present application discloses a gradient heat treatment furnace based on precise temperature control of heated gas, which comprises a cylindrical upper furnace body 1 and a cylindrical lower furnace body 2. Wherein, the lower furnace body 2 is supported by the supporting platform 3, the upper furnace body 1 and the lower furnace body 2 are arranged in a split way, and the upper furnace body 1 can be lifted by a hoisting device to be separated from the lower furnace body 2 or cover the lower furnace body 2 in the charging and discharging processes of the disc-shaped workpiece 9.
Referring to fig. 2, an upper chamber 11 is formed inside the upper furnace body 1, a hot air heating assembly 4 is annularly arranged inside the upper chamber 11, and the hot air heating assembly 4 is used for heating air so as to further heat the hub portion of the disc-shaped workpiece 9 by using the heated air. The hot air heating component 4 comprises a plurality of iron-chromium-aluminum heating belts which are uniformly distributed along the circumferential direction of the side wall of the upper cavity 11, and absorbs heat to heat up when air flows through the iron-chromium-aluminum heating belts under the condition that the iron-chromium-aluminum heating belts are electrified.
Referring to fig. 2, the gradient heat treatment furnace provided by the present application further comprises a hot air circulation assembly, wherein the hot air circulation assembly drives air in the furnace to circulate and output to the upper surface and the lower surface of the hub part of the disc-shaped workpiece 9 for heating. Specifically, the hot air circulation assembly comprises an air compression chamber 61 formed in the upper furnace body 1 and located at the upper part of the upper cavity 11, a high temperature circulating fan 62 is arranged at the center of the air compression chamber 61, an air inlet of the high temperature circulating fan 62 is formed downwards along the vertical direction, and the air inlet is connected with an air suction barrel 63. The air suction barrel 63 penetrates through the hot air heating assembly 4, and the axes of the air suction barrel and the hot air heating assembly are coincident.
Referring to fig. 3, a plurality of air outlet pipes 64 communicated with the upper cavity 11 are uniformly distributed on the bottom wall of the air pressing chamber 61, and the air in the air pressing chamber 61 flows out of the air outlet pipes 64, enters the upper cavity 11 and absorbs the heat of the hot air heating assembly 4 to heat. The air outlet pipe 64 is positioned in the upper cavity 11.
Referring to fig. 2, a support plate 65 fixedly connected to the lower surface of the upper furnace body 1 is disposed at an end of the upper chamber 11 away from the plenum 61, and the air suction tube 63 penetrates the support plate 65. On the lower surface of the supporting plate 65, a plurality of upper air spraying pipes 66 are uniformly arranged along the radial direction and the circumferential direction by taking the axis of the air suction barrel 63 as an axis, the upper air spraying pipes 66 are communicated with the upper cavity 11, and air entering the upper cavity 11 from the air pressing chamber 61 can be further sprayed to the upper surface of the hub part of the disc-shaped workpiece 9 along the upper air spraying pipes 66. The number of the upper blowing pipes 66 in the radial direction and the circumferential direction can be selected by those skilled in the art according to the heating requirement, and is not particularly limited herein.
The inner surface of the upper chamber 11 may be machined to form an angle with the vertical, with the upper portion having a larger diameter than the lower portion, thereby facilitating the flow of air from the upper chamber 11 into the upper plenum 66.
Referring to fig. 2, the side wall of the air compression chamber 61 is provided with a circulation duct 67 symmetrically with respect to the axis of the air suction pipe 63, and an air outlet chamber 68 is connected to the end of the circulation duct 67 along the air flow direction. On the top wall of the air outlet chamber 68, which is close to the side surface of the upper furnace body 1, a plurality of lower air spraying pipes 69 are uniformly distributed in the radial direction and the circumferential direction by taking the axis of the air suction barrel 63 as an axis, and the lower air spraying pipes 69 are communicated with the air outlet chamber 68. Thus, the air in the compressed air chamber 61 can be ejected to the lower surface of the hub portion of the disc-shaped workpiece 9 along the circulation duct 67, the air outlet chamber 68, and the lower air ejection duct 69 and heated. The number of the lower blowing pipes 69 in the radial direction and the circumferential direction may be selected by those skilled in the art according to the heating requirement, and is not particularly limited herein.
It is easily understood that, since the upper furnace body 1 and the lower furnace body 2 are separately provided, the circulation duct 67 may include an upper duct body 671 and a lower duct body 672. The upper pipe 671 is disposed inside the upper furnace body 1 and connected to the sidewall of the air compression chamber 61, and the lower pipe 672 is disposed inside the lower furnace body 2 and communicated with the air outlet chamber 68. When the upper furnace body 1 is covered on the lower furnace body 2, the upper pipe 671 and the lower pipe 672 are just in close butt joint.
Since the gradient heat treatment requires different temperatures to be applied to the rim portion and the hub portion of the disc-shaped workpiece 9, respectively, in order to realize the process of the gradient heat treatment, the rim portion and the hub portion of the disc-shaped workpiece 9 are isolated using the heat insulating assembly. Specifically, the insulation assembly includes an upper insulation drum 71 and a lower insulation drum 72. Wherein, the upper heat insulation cylinder 71 is arranged above the disc-shaped workpiece 9, one end of the upper heat insulation cylinder 71 is abutted against the upper surface of the disc-shaped workpiece 9, and the other end is sleeved outside the upper air spraying pipe 66 and is fixedly connected with the lower surface of the supporting plate 65. The lower heat insulating cylinder 72 is provided below the disc-shaped workpiece 9, and one end of the lower heat insulating cylinder 72 abuts against the lower surface of the disc-shaped workpiece 9 and the other end abuts against the inner surface of the bottom wall of the lower furnace body 2.
The inner and outer diameters of the upper and lower heat-insulating cylinders 71 and 72 can be designed according to the sizes of the rim portion and the hub portion of the disc-shaped workpiece 9. Further, since the gas circulates in the furnace, the temperatures of the gas injected onto the upper surface and the lower surface of the hub portion do not differ greatly, and the temperature uniformity of the upper surface and the lower surface of the hub portion can be ensured.
In the present application, the workpiece support structure is located inside the lower heat insulation cylinder 72, and may adopt a sleeve structure sleeved outside the lower air injection pipe 79, a structure of a plurality of split columns, or other forms of support structures, which may be selected as needed in the art, and is not specifically limited herein.
Referring to fig. 2, the air cooling module 8 includes a cooling fan 81 and a cooling duct 82 connected to the cooling fan 81. The cooling fan 81 is arranged outside the furnace body, one end of the cooling air pipe 82 is connected with the air outlet of the cooling fan 81, and the other end of the cooling air pipe 82 penetrates through the center of the bottom of the lower furnace body 2 and extends into the hub heating area. In the embodiment of the present application, the cooling air pipe 82 passes through the central hole of the disc-shaped workpiece 9 and enters the upper heat insulation cylinder 71 for a certain distance, and the person skilled in the art can also determine the position where the end of the cooling air pipe 82 extends to the hub heating area according to the requirement, for example, the end of the cooling air pipe 82 can be located in the lower heat insulation cylinder 72 or in the central hole of the disc-shaped workpiece 9. The top end face and the side face of the cooling air pipe 82 can be further provided with a plurality of uniformly distributed air dispersing holes so as to improve the uniformity of the cooling air flow in the hub heating area.
The cooling air duct 82 may further be provided with an adjusting valve 83 to control the speed and flow rate of the cooling air flow, thereby improving the accuracy of temperature control of the hub portion of the disc-shaped workpiece 9. By providing the air cooling assembly 8, the temperature of the hub portion of the disc-shaped workpiece 9 can be precisely adjusted to meet the process requirements of the gradient heat treatment.
Referring to fig. 2, a plurality of thermocouples 100 are provided through the bottom of the lower furnace body 2, wherein one thermocouple 100 abuts against the rim portion of the disc-shaped workpiece 9, and the other thermocouple 100 abuts against the hub portion of the disc-shaped workpiece 9. The thermocouples 100 are connected with external signal processing and control equipment such as a PLC (programmable logic controller) and the like, so that the heat treatment process of the disc-shaped workpiece 9 can be monitored in real time.
Based on the gradient heat treatment furnace, the application provides a gradient heat treatment method, which comprises the following steps:
and step S1, charging.
In step S1, the upper furnace body 1 is first hoisted and moved to another position by using a hoisting device such as a crane, and then the disk-shaped workpiece 9 to be heat-treated is placed on the workpiece support structure, and the upper furnace body 1 is hoisted and covered on the lower furnace body 2. At this time, the upper heat insulating cylinder 71 abuts the upper surface of the disc-shaped workpiece 9, and the lower heat insulating cylinder 72 abuts the lower surface of the disc-shaped workpiece 9.
Step S2, gradient heat treatment.
In step S2, the annular electric heating assembly 5 is first activated to heat the rim portion of the disc-shaped workpiece 9, during which the rim portion of the disc-shaped workpiece 9 has a temperature deviation of no more than 10 ℃ in the direction of the inward transition, i.e., a temperature deviation from the edge of the rim portion to the portion of the rim portion close to the heat insulating assembly of no more than 10 ℃, thereby enabling the rim portion to have good temperature uniformity and a fast temperature rise rate. The heating power of the annular electric heating assembly 5 is calculated according to the weight of the rim portion and the heat treatment process requirements.
The hot air heating unit 4 and the hot air circulating unit are started while the annular electric heating unit 5 heats the rim portion. The circularly heated gas is sprayed to the upper surface and the lower surface of the hub part under the driving of the hot air circulation assembly, so that the upper surface and the lower surface of the hub part are heated and heated simultaneously. Therefore, the temperature of the upper surface and the lower surface of the hub part can be rapidly and synchronously raised, and the hub part has good temperature uniformity.
During the gradient heat treatment, the rim portion and the hub portion of the disc-shaped workpiece 9 are simultaneously heated up to the set temperature, which is a simultaneous heating process for 3 to 6 hours. Then, the air-cooling unit 8 is activated and the speed and flow rate of the cooling air flow are adjusted to supply the cooling air flow to the hub heating area so that the temperature of the hub portion is maintained at the set temperature. Meanwhile, the annular electric heating assembly 5 continuously heats the rim part and rapidly heats the rim part to a target temperature, and the power of the annular electric heating assembly 5 is adjusted to keep the rim part at the target temperature for a heat treatment time meeting the requirement.
Here, a heat treatment process of the disc-shaped workpiece 9 of the nickel-base superalloy with a nominal composition GH720Li will be described as an example.
In one heat treatment, the rim portion and the hub portion of the disc-shaped workpiece 9 are first simultaneously heated to a set temperature of 850 ℃, this heating process being 4 hours. The hub portion is then maintained at 850 ℃ by operation of the air-cooled assembly 9, and the rim portion is continuously and rapidly warmed to a target temperature of 1150 ℃ by the annular electric heating assembly 5 and maintained for 4 hours for heat treatment. Thus, the disc-shaped workpiece 9 can be subjected to heat treatment at a large temperature gradient of 300 ℃, and the temperature difference between the upper and lower surfaces of the hub portion of the disc-shaped workpiece 9 can be limited to the range of ± 20 ℃.
In another heat treatment, the rim portion and the hub portion of the disc-shaped workpiece 9 are first simultaneously warmed to a set temperature of 1000 c, which is 5.5 hours. The hub portion is then maintained at 1000 ℃ by operation of the air-cooled assembly 8, and the rim portion is continuously and rapidly warmed to a target temperature of 1100 ℃ by the annular electric heating assembly 5 and maintained for 4 hours for heat treatment. Thereby, the disc-shaped workpiece 9 can be subjected to the heat treatment at a small temperature gradient of 100 ℃, and the temperature difference of the upper and lower surfaces of the hub portion of the disc-shaped workpiece 9 can be limited to the range of ± 12 ℃.
In the present application, the high temperature uniformity of the upper and lower surfaces of the hub portion enables effective control of the tissue distribution at the gradient temperature interface of the disc-shaped workpiece 9.
And step S3, discharging.
In step S3, after the disk-shaped workpiece 9 is subjected to gradient heat treatment, the disk-shaped workpiece 9 is naturally cooled to room temperature, the upper furnace body 1 is lifted and separated from the lower furnace body 2, and the disk-shaped workpiece 9 is taken out.
The above is a preferred embodiment of the present application, and the scope of protection of the present application is not limited by the above, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A gradient heat treatment furnace based on accurate temperature control of heated gas is characterized by comprising: the furnace comprises an upper furnace body (1), a lower furnace body (2), a hot air circulation assembly and an air cooling assembly (8);
an upper cavity (11) is formed in the upper furnace body (1), and a hot air heating assembly (4) for heating air is arranged in the upper cavity (11);
a lower cavity (21) is formed in the lower furnace body (2), and an annular electric heating component (5) for heating the rim part of the disc-shaped workpiece (9) is arranged in the lower cavity (21);
the lower cavity (21) is also internally provided with a heat insulation assembly which is used for isolating the rim part and the hub part of the disc-shaped workpiece (9);
the hot air circulation assembly can output the air heated by the hot air heating assembly (4) to the upper surface and the lower surface of the hub part of the disc-shaped workpiece (9) for heating;
the air cooling component (8) is used for sending cooling air into the hub heating area to adjust the heating temperature of the hub part;
a plurality of thermocouples (100) are inserted into the lower furnace body (2), and the thermocouples (100) are used for measuring the temperature of the rim part and the hub part of the disc-shaped workpiece (9).
2. The gradient heat treatment furnace according to claim 1, wherein the hot air circulation assembly comprises a pressure air chamber (61) arranged in the upper furnace body (1) and positioned at the upper part of the upper cavity (11), a high-temperature circulating fan (62) is arranged in the pressure air chamber (61), an air inlet of the high-temperature circulating fan (62) is connected with an air suction barrel (63), and the air suction barrel (63) penetrates through the upper cavity (11) and is communicated with the hub heating area;
the bottom wall of the air compression chamber (61) is provided with a plurality of air outlet pipes (64) communicated with the upper cavity (11), the lower end of the upper cavity (11) is provided with a plurality of upper air spraying pipes (66) communicated with the upper cavity (11), and air in the air compression chamber (61) is sprayed to the upper surface of the hub part of the disc-shaped workpiece (9) through the air outlet pipes (64), the upper cavity (11) and the upper air spraying pipes (66);
the side wall of the air compression chamber (61) is connected with a circulating air pipe (67), the tail end of the circulating air pipe (67) along the air flow direction is connected with a lower air injection pipe (69), and air in the air compression chamber (61) is injected to the lower surface of the hub part of the disc-shaped workpiece (9) through the circulating air pipe (67) and the lower air injection pipe (69).
3. The gradient heat treatment furnace according to claim 2, wherein the upper and lower blast ducts (66, 69) are uniformly arranged in a radial and circumferential direction with respect to the surface of the disc-shaped workpiece (9) with the axis of the suction drum (63) as an axis.
4. The gradient heat treatment furnace according to claim 2, wherein the circulating air duct (67) comprises an upper duct body (671) located in the upper furnace body (1) and connected to a side wall of the plenum chamber (61) and a lower duct body (672) located in the lower furnace body (2), the upper duct body (671) and the lower duct body (672) communicating.
5. The gradient heat treatment furnace according to claim 2, wherein the heat insulation assembly comprises an upper heat insulation cylinder (71) and a lower heat insulation cylinder (72);
the upper heat insulation cylinder (71) is positioned between the disc-shaped workpiece (9) and the upper furnace body (1) and sleeved outside the upper air spraying pipe (66);
the lower heat insulation cylinder (72) is positioned between the disc-shaped workpiece (9) and the bottom inner surface of the lower furnace body (2).
6. The gradient heat treatment furnace according to claim 1, wherein the hot air heating assembly (4) comprises a plurality of iron-chromium-aluminum heating belts which are uniformly distributed along the circumferential direction of the side wall of the upper cavity (11);
the annular electric heating assembly (5) comprises a plurality of iron-chromium-aluminum heating belts which are uniformly distributed along the circumferential direction of the side wall of the lower cavity (21).
7. A gradient heat treatment method using the gradient heat treatment furnace according to any one of claims 1 to 6, comprising:
step S1, charging: separating the upper furnace body (1) and the lower furnace body (2), placing the disc-shaped workpiece (9) in the lower furnace body (2), and covering the upper furnace body (1) on the lower furnace body (2);
step S2, gradient heat treatment: starting the annular electric heating assembly (5) to heat the rim part of the disc-shaped workpiece (9), simultaneously starting the hot air circulation assembly and the hot air heating assembly (4) to heat the hub part of the disc-shaped workpiece (9), and simultaneously heating the rim part and the hub part of the disc-shaped workpiece (9) to a set temperature; starting an air cooling assembly (8), keeping the temperature of the rim part of the disc-shaped workpiece (9) constant, and continuously heating the rim part of the disc-shaped workpiece (9) to a target temperature by the annular electric heating assembly (5) and keeping the temperature for a heat treatment time;
step S3, discharging: and after the disc-shaped workpiece (9) is naturally cooled to room temperature, separating the upper furnace body (1) and the lower furnace body (2) and taking out the disc-shaped workpiece (9).
8. The heat treatment method according to claim 7, wherein in step S2, the annular electric heating element (5) heats the rim portion of the disc-shaped workpiece (9) with a temperature deviation of not more than 10 ℃ in a direction of inward transition of the rim portion.
9. The heat treatment method according to claim 7, wherein the rim portion and the hub portion of the disc-shaped workpiece (9) are simultaneously heated for 3 to 6 hours.
10. A heat treatment method according to claim 7, wherein the difference in temperature between the upper surface and the lower surface of the disc-shaped workpiece (9) during heating is ± 20 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110410196.1A CN113234914B (en) | 2021-04-16 | 2021-04-16 | Gradient heat treatment furnace based on accurate temperature control of heating gas and heat treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110410196.1A CN113234914B (en) | 2021-04-16 | 2021-04-16 | Gradient heat treatment furnace based on accurate temperature control of heating gas and heat treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113234914A true CN113234914A (en) | 2021-08-10 |
| CN113234914B CN113234914B (en) | 2022-07-19 |
Family
ID=77129622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110410196.1A Active CN113234914B (en) | 2021-04-16 | 2021-04-16 | Gradient heat treatment furnace based on accurate temperature control of heating gas and heat treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113234914B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115948704A (en) * | 2022-12-29 | 2023-04-11 | 北京钢研高纳科技股份有限公司 | Heat treatment method of high-temperature alloy case forging and case forging manufactured by same |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7037797B1 (en) * | 2000-03-17 | 2006-05-02 | Mattson Technology, Inc. | Localized heating and cooling of substrates |
| CN102643958A (en) * | 2012-04-26 | 2012-08-22 | 西北工业大学 | Heat treatment device for gradient of disk component |
| CN104711403A (en) * | 2015-03-03 | 2015-06-17 | 西北工业大学 | Split inductive heating gradient heat treatment device |
| CN206692689U (en) * | 2017-04-01 | 2017-12-01 | 天龙科技炉业(无锡)有限公司 | Rotary hub type furnace treatment manages automatic assembly line |
| CN109680137A (en) * | 2019-01-18 | 2019-04-26 | 东北大学 | A kind of oblate steel heat treatment furnace of open-type |
| CN112080622A (en) * | 2020-09-26 | 2020-12-15 | 陕西科技大学 | Gradient heat treatment device and gradient heat treatment method for disc-type workpiece |
| CN112143872A (en) * | 2020-09-16 | 2020-12-29 | 西北工业大学 | Turbine disc gradient temperature field regulation and control device and method |
-
2021
- 2021-04-16 CN CN202110410196.1A patent/CN113234914B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7037797B1 (en) * | 2000-03-17 | 2006-05-02 | Mattson Technology, Inc. | Localized heating and cooling of substrates |
| CN102643958A (en) * | 2012-04-26 | 2012-08-22 | 西北工业大学 | Heat treatment device for gradient of disk component |
| CN104711403A (en) * | 2015-03-03 | 2015-06-17 | 西北工业大学 | Split inductive heating gradient heat treatment device |
| CN206692689U (en) * | 2017-04-01 | 2017-12-01 | 天龙科技炉业(无锡)有限公司 | Rotary hub type furnace treatment manages automatic assembly line |
| CN109680137A (en) * | 2019-01-18 | 2019-04-26 | 东北大学 | A kind of oblate steel heat treatment furnace of open-type |
| CN112143872A (en) * | 2020-09-16 | 2020-12-29 | 西北工业大学 | Turbine disc gradient temperature field regulation and control device and method |
| CN112080622A (en) * | 2020-09-26 | 2020-12-15 | 陕西科技大学 | Gradient heat treatment device and gradient heat treatment method for disc-type workpiece |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115948704A (en) * | 2022-12-29 | 2023-04-11 | 北京钢研高纳科技股份有限公司 | Heat treatment method of high-temperature alloy case forging and case forging manufactured by same |
| CN115948704B (en) * | 2022-12-29 | 2024-03-01 | 北京钢研高纳科技股份有限公司 | Heat treatment method of high-temperature alloy casing forging and prepared casing forging |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113234914B (en) | 2022-07-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107695137A (en) | Straightening method and fixture are deformed after a kind of annular flame tube high temperature enamel paint | |
| CA2452896C (en) | Method and apparatus for performing welding at elevated temperature | |
| CN113234914B (en) | Gradient heat treatment furnace based on accurate temperature control of heating gas and heat treatment method | |
| US11319605B2 (en) | Heat treatment apparatus and heat treatment method | |
| JPH0374503A (en) | Methods and apparatuses for centering ring and for uniformly heating shaft | |
| US20140367898A1 (en) | Cooling systems for heat-treated parts and methods of use | |
| CN102389758A (en) | New glass-lined reactor and manufacturing method thereof | |
| CN105886746A (en) | Induction shape correcting and die quenching and tempering technological method and equipment for annular parts | |
| CN105798560A (en) | Integral forging technique for blind hole flange type cardan joint | |
| KR19980072267A (en) | Heating and cooling methods of non-alloyed steel and apparatus | |
| EP3466633B1 (en) | High-performance workpiece heating system and method | |
| CN106480298A (en) | The process for quenching of annular work piece | |
| CN113061709B (en) | Design method of gradient heat treatment furnace with accurately controllable temperature gradient and double-tissue disc piece | |
| US9709099B2 (en) | Bearing ring and rolling bearing | |
| CN111500954B (en) | Heat treatment process for large high-strength magnesium alloy thin-wall casting | |
| CN107723436A (en) | A kind of device and method for preventing heat treatment of workpieces deformation | |
| CN107340332B (en) | Cylinder block inspection method and system | |
| JP2019157166A (en) | Work tempering process, and machine part obtained by said process | |
| CN111979538B (en) | Device and method for improving defects of cladding layer based on eddy current induction technology | |
| CN107436038B (en) | Heating control method and heating control system for annular part | |
| JP2018009208A (en) | Method for quenching annular workpiece | |
| CN105344752B (en) | A kind of conical thin-wall part school shape mould | |
| CN112779382B (en) | Heat treatment method for hot work die steel | |
| JP2019157272A (en) | Work tempering process, and machine part obtained by said process | |
| CN112642504B (en) | Heating device capable of continuously realizing radial gradient temperature difference of wheel disc |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |