CN112831634B - Negative pressure gas quenching device of tube furnace - Google Patents
Negative pressure gas quenching device of tube furnace Download PDFInfo
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- CN112831634B CN112831634B CN202110009928.6A CN202110009928A CN112831634B CN 112831634 B CN112831634 B CN 112831634B CN 202110009928 A CN202110009928 A CN 202110009928A CN 112831634 B CN112831634 B CN 112831634B
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- furnace
- air outlet
- air inlet
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- 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
- C21D1/62—Quenching devices
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- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/613—Gases; Liquefied or solidified normally gaseous material
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Abstract
The invention relates to a negative pressure gas quenching device of a tube furnace, belonging to the technical field of metal heat treatment. The device comprises a stainless steel flange plate, a bottom support, an air inlet pipe and an air outlet pipe, wherein the bottom support is fixed on the stainless steel flange plate, a sample table is arranged on the surface of the bottom support, and the air inlet pipe and the air outlet pipe are symmetrically distributed on two sides of the sample table; in the heat treatment process, the sample is placed on the sample table and is at the same height with the air inlet pipe and the air outlet pipe. The furnace tube keeps a negative pressure state in the whole experiment process, and the cooling strength can be regulated and controlled to meet the experiment requirements of different materials and different heat treatment processes by regulating the argon flow of the air inlet tube during gas quenching. The negative pressure gas quenching method adopted by the invention has no oxidation risk in the whole process, the operation process is simple, convenient and quick, and the cooling efficiency of the negative pressure gas quenching is far higher than that of other cooling modes; meanwhile, the device provided by the invention is convenient to refit and maintain, can be applied to tubular furnaces of different models/pipe diameters, does not need to additionally modify equipment, and greatly improves the experimental efficiency and operability.
Description
The technical field is as follows:
the invention relates to the technical field of metal heat treatment, in particular to a negative pressure gas quenching device of a tubular furnace.
Background art:
quenching is one of the most widely used processes in the heat treatment of steel by heating the steel to Ac3(hypoeutectoid steel) or Ac1The steel is cooled at a temperature not lower than the temperature of the hypereutectoid steel and at a temperature higher than the critical cooling rate, thereby obtaining a room-temperature structure mainly containing martensite. However, quartz or corundum is often used as a furnace tube material in the conventional tube furnace, so that the thermal shock resistance is poor, and the furnace tube cannot be rapidly cooled. When the traditional liquid quenching method is adopted to realize high-temperature quenching of the sample, the sample needs to be taken out from a high-temperature hearth for quenching treatment, so that the potential safety hazard exists, and the surface of the sample can be cooled and oxidized in the taking and placing process, thereby influencing the experimental effect.
The gas quenching method is the most ideal rapid quenching process at present due to the characteristics of no oxidation, cleanness and high efficiency. Chinese patent CN 209162140U discloses a heat treatment annealing furnace based on multi-furnace gas pipeline, which carries out rapid gas cooling quenching on samples by arranging an inert gas inlet pipe and a gas nozzle in the furnace tube. However, the annealing furnace to which this patent relates has various drawbacks: 1. the furnace body of the annealing furnace is not provided with a gas outlet, and the internal gas pressure of the furnace tube possibly exceeds the bearing limit of the sealing device during ventilation and cooling so as to cause safety accidents; 2. when the flow of the cooling gas is large, the gas jet formed along the direction of the gas nozzle may cause the local cooling rate of the furnace tube to exceed the bearing limit, resulting in the breakage of the furnace tube; 3. at present, most tube furnace tubes of the tube furnace are not provided with a gas inlet channel, so that the modification cost is too high.
The invention content is as follows:
in order to solve the problems of the technology and the equipment, the invention provides a safe and efficient tubular furnace negative pressure gas quenching device, which has the following specific technical scheme:
the device designed by the invention comprises: comprises a stainless steel flange plate, a bottom support, an air inlet pipe and an air outlet pipe;
the stainless steel flange plate is provided with an observation window, and an air inlet channel and an air outlet channel which are used for communicating the gas pipelines inside and outside the furnace tube; the collet is fixed on the stainless steel flange plate, and a sample table is arranged on the surface of the collet.
Furthermore, the stainless steel flange plate is matched with the furnace tube of the tube furnace in size and is fixedly connected on the furnace tube through threads or a clamping hook, so that the air tightness in the furnace tube can be kept good in the heating process.
Furthermore, the gas inlet channel is provided with a gas flow regulating valve outside the furnace tube and is connected with an argon source through a valve; and the air outlet channel is provided with a vacuum valve outside the furnace tube and is connected with a vacuum pump through a valve.
Furthermore, the air inlet pipe and the air outlet pipe are connected with the air inlet channel and the air outlet channel through threads.
Furthermore, the air inlet pipe and the air outlet pipe are symmetrically distributed on two sides of the sample table, and pipe openings are all arranged on the middle line of the sample table and keep the same height with the sample.
Further, the bottom support is made of heat-resistant quartz or high-temperature-resistant stainless steel, and the air inlet pipe and the air outlet pipe are made of high-temperature-resistant stainless steel.
The negative pressure gas quenching device for the tube furnace provided by the invention has the following beneficial effects:
(1) the invention has simple equipment, convenient operation and easy maintenance, can be applied to the tubular furnaces with different types/pipe diameters, and does not need to additionally reform the furnace body of the tubular furnace; meanwhile, gas jet flow pointing to the pipe wall cannot be generated in the negative pressure gas quenching process, and the safety is high.
(2) The cooling strength of the negative pressure gas quenching method adopted by the invention is far higher than that of the conventional cooling method, and the cooling speed of the sample can be adjusted by adjusting experimental variables such as argon gas flow, outlet pressure and the like, so that the requirements of different materials and different heat treatment experimental processes are met.
Description of the drawings:
the patent is further described with reference to the following figures and specific examples.
FIG. 1 is a schematic structural view of a stainless steel flange of a gas quenching device of a tube furnace.
FIG. 2 is a schematic structural diagram of a gas quenching device of a tube furnace.
FIG. 3 is a schematic diagram of the practical application effect of the gas quenching device of the tube furnace.
In the figure: 1-stainless steel flange plate, 2-bottom support, 3-air inlet pipe, 4-air outlet pipe, 5-glass observation window, 6-air inlet channel, 7-air outlet channel, 8-sample table, 9-air flow regulating valve, 10-vacuum valve, 11-furnace body, 12-electric heating body, 13-furnace tube, 14-guide rail, 15-support, 16-base and 17-heat treatment sample.
The specific implementation mode is as follows:
the principles and features of this invention are described below in conjunction with the following drawings, the examples of which are set forth to illustrate the invention and are not intended to limit the scope of the invention.
As shown in attached figures 1 and 2, the invention relates to a negative pressure gas quenching device of a tube furnace, which comprises a stainless steel flange plate 1, a bottom support 2, an air inlet pipe 3 and an air outlet pipe 4;
the stainless steel flange plate 1 is provided with a glass observation window 5, and an air inlet channel 6 and an air outlet channel 7 which are used for communicating the gas pipelines inside and outside the furnace tube; the collet 2 is fixed on the stainless steel flange plate 1, and a sample table 8 is arranged on the surface of the stainless steel flange plate.
The stainless steel flange plate 1 is matched with the furnace tube of the tube furnace in size and is fixedly connected on the furnace tube through threads or a clamping hook, and the air tightness in the furnace tube can be kept good in the heating process.
The gas inlet channel 6 is provided with a gas flow regulating valve 9 on the outer side of the tube furnace tube and is connected with an argon source through a valve; and the air outlet channel 7 is provided with a vacuum valve 10 on the outer side of the tube furnace and is connected with a vacuum pump through a valve.
The air inlet pipe 3 and the air outlet pipe 4 are connected with the air inlet channel 6 and the air outlet channel 7 through threads.
The air inlet pipe 3 and the air outlet pipe 4 are symmetrically distributed on two sides of the sample table 8, and the air outlet end of the air inlet pipe 3 and the air inlet end of the air outlet pipe 4 are both arranged on the central line of the sample table 8 and keep the same height with the sample.
The base support 2 is made of heat-resistant glass or high-temperature-resistant stainless steel, and the air inlet pipe 3 and the air outlet pipe 4 are made of high-temperature-resistant stainless steel.
As shown in fig. 3, the horizontal tube furnace used in this embodiment is composed of a furnace body 11, an electric heater 12, a furnace tube 13, a guide rail 14, a support 15, and a base 16. The stainless steel flange plate 1 is connected with the tube furnace tube 13 of the tube furnace through a clamping hook. The tube furnace body 11 can be moved by means of guide rails 14 in order to perform maintenance on the furnace tubes 13.
In the heat treatment experiment process, the sample 17 is fixed on the surface of the sample table 8 and is at the same height with the air inlet pipe 3 and the air outlet pipe 4. Before heating, the vacuum pump and the vacuum valve 10 are opened, and after the vacuum degree meets the experimental requirement, the electric heating body 12 is controlled by the numerical control heating device to heat. After the sample is heated to the designated temperature and kept warm for a sufficient time, the gas flow regulating valve 9 is opened, and the sample 17 is cooled under the negative pressure condition. The cooling strength is changed by adjusting the argon flow so as to meet the experimental requirements of different samples.
According to the invention, the gas inlet pipe and the gas outlet pipe are symmetrically arranged on two sides of the sample table, so that the rapid negative pressure gas quenching of the tubular furnace sample is realized, compared with the traditional liquid quenching method, the negative pressure gas quenching method adopted by the invention has no oxidation risk in the whole process, the cooling strength is much higher than that of other cooling modes, the sample cooling speed can be adjusted by adjusting experimental variables such as argon gas flow, outlet pressure and the like, and the requirements of different materials and different heat treatment experimental processes are met. Meanwhile, the device provided by the invention is convenient to refit and maintain, does not generate gas jet flow pointing to the pipe wall in the negative pressure gas quenching process, has high safety, can be applied to pipe furnaces of different models/pipe diameters, does not need to additionally modify equipment, and greatly improves the experimental efficiency and operability.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (4)
1. The utility model provides a tube furnace negative pressure gas quenching device which characterized in that: comprises a stainless steel flange plate (1), a bottom support (2), an air inlet pipe (3) and an air outlet pipe (4);
the stainless steel flange plate (1) is provided with an observation window (5), and an air inlet channel (6) and an air outlet channel (7) which are used for communicating the gas pipelines inside and outside the furnace tube; the bottom support (2) is fixed on the stainless steel flange plate (1), a sample table (8) is arranged on the surface of the bottom support, and the air inlet pipe (3) and the air outlet pipe (4) are symmetrically distributed on two sides of the sample table (8);
the stainless steel flange plate (1) is adaptive to the furnace tube of the tube furnace in size and is fixedly connected on the furnace tube through threads or a clamping hook, and the air tightness in the furnace tube is kept good in the heating process;
the gas inlet channel (6) is provided with a gas flow regulating valve (9) on the outer side of the furnace tube and is connected with an argon source through a valve; and the air outlet channel (7) is provided with a vacuum valve (10) on the outer side of the furnace tube and is connected with a vacuum pump through a valve.
2. The tube furnace negative pressure gas quenching device of claim 1, wherein: the air inlet pipe (3) and the air outlet pipe (4) are connected with the air inlet channel (6) and the air outlet channel (7) through threads.
3. The tube furnace negative pressure gas quenching device of claim 1, wherein: and the openings of the air inlet pipe (3) and the air outlet pipe (4) are arranged on the middle line of the sample table and keep the same height with the sample.
4. The tube furnace negative pressure gas quenching device of claim 1, wherein: the base (2) is made of heat-resistant quartz or high-temperature-resistant stainless steel, and the air inlet pipe (3) and the air outlet pipe (4) are made of high-temperature-resistant stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110009928.6A CN112831634B (en) | 2021-01-05 | 2021-01-05 | Negative pressure gas quenching device of tube furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110009928.6A CN112831634B (en) | 2021-01-05 | 2021-01-05 | Negative pressure gas quenching device of tube furnace |
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| Publication Number | Publication Date |
|---|---|
| CN112831634A CN112831634A (en) | 2021-05-25 |
| CN112831634B true CN112831634B (en) | 2022-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110009928.6A Active CN112831634B (en) | 2021-01-05 | 2021-01-05 | Negative pressure gas quenching device of tube furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112129914A (en) * | 2019-06-24 | 2020-12-25 | 上海宝信软件股份有限公司 | Rapid cooling device of strip steel heat treatment process simulation experiment device and working method |
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