CN113528780A - Method for controlling cooling speed of heat treatment furnace - Google Patents
Method for controlling cooling speed of heat treatment furnace Download PDFInfo
- Publication number
- CN113528780A CN113528780A CN202110114783.6A CN202110114783A CN113528780A CN 113528780 A CN113528780 A CN 113528780A CN 202110114783 A CN202110114783 A CN 202110114783A CN 113528780 A CN113528780 A CN 113528780A
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- furnace
- compressed air
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- temperature
- heating element
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 51
- 238000001816 cooling Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004321 preservation Methods 0.000 claims description 7
- 238000007669 thermal treatment Methods 0.000 claims description 6
- 238000011426 transformation method Methods 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000011324 bead Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
Abstract
The invention provides a method for controlling the cooling speed of a heat treatment furnace, which can control the cooling speed of the furnace by modifying a conventional heat treatment air furnace. Which comprises the following steps: firstly, a wind shield is additionally arranged at a position corresponding to a heating element in a hearth, a certain gap is reserved between the wind shield and the heating element to form a duct, the upper end and the lower end of the duct are communicated with the hearth, holes are drilled around a ventilation opening and are connected with a compressed air source through the drilled holes; secondly, putting a workpiece into the hearth for heat treatment, setting a furnace temperature curve according to a target furnace cooling speed value without closing the heating element when a furnace cooling program needs to be entered, simultaneously starting to introduce compressed air through the drilled holes, introducing the compressed air with 1/5-1/3 total flow rate, maintaining for 10-20 minutes, then adjusting the introduction amount of the compressed air to the maximum, and closing the compressed air after the temperature is reduced to a low temperature stage for 10-30 minutes, thus completing the furnace cooling program.
Description
Technical Field
The invention relates to the technical field of metal heat treatment, in particular to a method for controlling the cooling speed of a heat treatment furnace.
Background
The metal material is often heated and insulated in two stages in the heat treatment process, part of the material is insulated from a high-temperature stage to a low-temperature stage after being cooled, and the cooling speed is required to be within a certain range. For example, for GH4169 material, the specification requires that the aging heat treatment stage is carried out by keeping the temperature at 718 ℃ for 8 hours, then cooling the material to 621 ℃ at a furnace cooling rate of 55 +/-8 ℃ per hour, and keeping the temperature for 8 hours, and for a conventional heat treatment air furnace (the conventional heat treatment air furnace heats a hearth through a heating element and only dissipates heat through a fan), two options are available in the furnace cooling process: 1. closing the heating element to cool, wherein the heating element is not heated; 2. the furnace temperature profile is set to correspond to the furnace cooling rate without turning off the heating element. The first method relies on the heat dissipation of an air furnace to realize the cooling, the cooling speed is uncontrollable, the cooling is very slow, and the second method controls the temperature of a heating element, but the temperature change in a hearth is difficult to ensure to conform to the furnace temperature curve, the furnace cooling speed in the whole process is slower, and the hearth temperature is difficult to reach the required cooling speed. And in addition, purchasing a heat treatment air furnace meeting the requirement needs to consume manpower, material resources, financial resources and time cost.
Disclosure of Invention
Aiming at the problems that the furnace cooling speed of the conventional heat treatment air furnace is uncontrollable and cannot reach a target value, the invention provides a method for controlling the cooling speed of the heat treatment furnace, which can control the furnace cooling speed by modifying the conventional heat treatment air furnace.
The technical scheme is as follows: a method for controlling a cooling rate of a heat treatment furnace, comprising the steps of: the utility model provides a reform transform thermal treatment air furnace, thermal treatment air furnace includes furnace, and the furnace top is equipped with the vent, and vent department installs the fan, and the furnace lateral wall is equipped with heating element, and the transformation method is: the method comprises the following steps that a wind shield is additionally arranged at a position, corresponding to a heating element, in a hearth, a certain gap is reserved between the wind shield and the heating element to form a duct, the upper end and the lower end of the duct are communicated with the hearth, holes are drilled around an air vent and are connected with a compressed air source through the drilled holes, and compressed air is blown in towards the upper end of the duct after the compressed air is communicated;
and secondly, placing a workpiece in the hearth for heat treatment, wherein the heat treatment comprises a high-temperature stage, a high-temperature heat preservation stage, a cooling stage and a low-temperature stage, when a furnace cooling program is required to enter after the high-temperature heat preservation stage of the heat treatment is finished, setting a furnace temperature curve according to a target furnace cooling speed value without closing a heating element, simultaneously starting to introduce compressed air through a drilled hole, introducing compressed air with the total flow of 1/5-1/3 into the compressed air, maintaining for 10-20 minutes, adjusting the introduction amount of the compressed air to the maximum, and closing the compressed air after the temperature is reduced to the low-temperature stage for 10-30 minutes, thus finishing the furnace cooling program.
It is further characterized in that:
the pressure of the compressed air is 6-8 kg.f/cm2；
The number of the drilled holes is 1-4.
The invention has the beneficial effects that: 1. the conventional heat treatment furnace is transformed to the minimum degree, so that a large amount of cost is saved;
2. the method of the invention can obtain controllable, stable and satisfactory furnace cooling speed, and the furnace cooling curve is smooth and straight.
Drawings
FIG. 1 is a schematic view of the gas flow direction;
fig. 2 is a schematic view of the position of the opening.
Detailed Description
A method for controlling a cooling rate of a heat treatment furnace, comprising the steps of: firstly, a thermal treatment air furnace is improved, as shown in a combined figure 1, the thermal treatment air furnace comprises a hearth 1, a vent 7 is arranged above the hearth 1, a fan 2 is arranged at the vent 7, a heating element 3 is arranged on the side wall of the hearth 1, and the improvement method comprises the following steps: install vertical deep bead 4 additional in furnace 1 corresponding heating element 3's position, leave certain clearance between deep bead 4 and the heating element 3 and form duct 5, duct 5 upper and lower end and furnace 1 intercommunication, combine fig. 2, 4 (for example drill on 2 casings of fan) in fan 2 drilling, drilled hole 6 is located around vent 7 to be connected with the compressed air supply through drilled hole 6, make compressed air blow in towards duct 5 upper end opening after the switch-on compressed air.
Secondly, putting the workpiece into the hearth 1 for heat treatment, wherein the heat treatment comprises a high-temperature stage, a high-temperature heat preservation stage, a cooling stage, a low-temperature stage and a low-temperature heat preservation stage, and the high-temperature heat preservation stage of the heat treatmentAfter the furnace cooling program is finished, when the furnace cooling program needs to be started, the furnace temperature curve is set according to the target furnace cooling speed value without closing the heating element, and meanwhile compressed air begins to be introduced through the drilled holes, wherein the pressure of the compressed air is 6-8 kg.f/cm2。
In the scheme, after the compressed air enters the fan, the fan pumps the air in the hearth through the vent 7, and the holes 6 are positioned around the vent, so that the compressed air flows in from the top to the duct formed between the air guide plate and the hearth, enters the hearth after being subjected to sufficient heat exchange with the heating element, and then flows back from the top vent, and the reciprocating circulation is carried out, so that the furnace temperature tends to be uniform and is consistent with the set value, namely the temperature of the heating element, and the aim of uniformly and controllably controlling the furnace temperature is fulfilled.
When compressed air is introduced at the beginning, firstly introducing the compressed air with the total flow of 1/5-1/3 into the compressed air to prevent the temperature of the furnace from being cooled too fast, maintaining the temperature for 10-20 minutes, then adjusting the introduction amount of the compressed air to the maximum, waiting for 10-30 minutes after the temperature is cooled to a low temperature stage, then closing the compressed air to prevent the temperature dissipated by a workpiece from causing the temperature of the furnace to rise again, stably and uniformly reducing the temperature of the furnace according to a target value in the whole process, and avoiding the phenomena of slow temperature reduction or temperature flushing after temperature reduction.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A method for controlling a cooling rate of a heat treatment furnace, comprising the steps of: the utility model provides a reform transform thermal treatment air furnace, thermal treatment air furnace includes furnace, and the furnace top is equipped with the vent, and vent department installs the fan, and the furnace lateral wall is equipped with heating element, and the transformation method is: the method comprises the following steps that a wind shield is additionally arranged at a position, corresponding to a heating element, in a hearth, a certain gap is reserved between the wind shield and the heating element to form a duct, the upper end and the lower end of the duct are communicated with the hearth, holes are drilled around an air vent and are connected with a compressed air source through the drilled holes, and compressed air is blown in towards the upper end of the duct after the compressed air is communicated;
and secondly, placing a workpiece in the hearth for heat treatment, wherein the heat treatment comprises a high-temperature stage, a high-temperature heat preservation stage, a cooling stage and a low-temperature stage, when a furnace cooling program is required to enter after the high-temperature heat preservation stage of the heat treatment is finished, setting a furnace temperature curve according to a target furnace cooling speed value without closing a heating element, simultaneously starting to introduce compressed air through a drilled hole, introducing compressed air with the total flow of 1/5-1/3 into the compressed air, maintaining for 10-20 minutes, adjusting the introduction amount of the compressed air to the maximum, and closing the compressed air after the temperature is reduced to the low-temperature stage for 10-30 minutes, thus finishing the furnace cooling program.
2. A method for controlling a cooling rate of a heat treatment furnace according to claim 1, wherein: the pressure of the compressed air is 6-8 kg.f/cm2。
3. A method for controlling a cooling rate of a heat treatment furnace according to claim 1, wherein: the number of the drilled holes is 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110114783.6A CN113528780A (en) | 2021-01-28 | 2021-01-28 | Method for controlling cooling speed of heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110114783.6A CN113528780A (en) | 2021-01-28 | 2021-01-28 | Method for controlling cooling speed of heat treatment furnace |
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| Publication Number | Publication Date |
|---|---|
| CN113528780A true CN113528780A (en) | 2021-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110114783.6A Pending CN113528780A (en) | 2021-01-28 | 2021-01-28 | Method for controlling cooling speed of heat treatment furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114733916A (en) * | 2022-03-04 | 2022-07-12 | 贵州捷盛钻具股份有限公司 | Hollow steel hot rolling method for drill rod, hollow steel, heat insulation box and hot rolling mill |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4610435A (en) * | 1983-12-23 | 1986-09-09 | Ipsen Industries International Gmbh | Industrial furnace for the thermal treatment of metal workpieces |
| CN1807661A (en) * | 2005-12-29 | 2006-07-26 | 上海交通大学 | Heat treatment furnace employing heat pipe to quickly lower temperature |
| CN202063966U (en) * | 2011-03-29 | 2011-12-07 | 浙江约特工具有限公司 | Continuous tempering furnace of saw blade |
| CN103276170A (en) * | 2013-06-03 | 2013-09-04 | 艾伯纳工业炉(太仓)有限公司 | Air circulation system of aging furnace |
| CN203320063U (en) * | 2013-06-03 | 2013-12-04 | 艾伯纳工业炉(太仓)有限公司 | Air circulation system of aging furnace |
| CN104531957A (en) * | 2015-01-05 | 2015-04-22 | 江苏博能炉业有限公司 | Rapid cooling device for heat treatment furnace |
| CN111996355A (en) * | 2020-09-18 | 2020-11-27 | 湘潭华宇电炉制造有限公司 | Heat treatment heating furnace and heat treatment method |
-
2021
- 2021-01-28 CN CN202110114783.6A patent/CN113528780A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4610435A (en) * | 1983-12-23 | 1986-09-09 | Ipsen Industries International Gmbh | Industrial furnace for the thermal treatment of metal workpieces |
| CN1807661A (en) * | 2005-12-29 | 2006-07-26 | 上海交通大学 | Heat treatment furnace employing heat pipe to quickly lower temperature |
| CN202063966U (en) * | 2011-03-29 | 2011-12-07 | 浙江约特工具有限公司 | Continuous tempering furnace of saw blade |
| CN103276170A (en) * | 2013-06-03 | 2013-09-04 | 艾伯纳工业炉(太仓)有限公司 | Air circulation system of aging furnace |
| CN203320063U (en) * | 2013-06-03 | 2013-12-04 | 艾伯纳工业炉(太仓)有限公司 | Air circulation system of aging furnace |
| CN104531957A (en) * | 2015-01-05 | 2015-04-22 | 江苏博能炉业有限公司 | Rapid cooling device for heat treatment furnace |
| CN111996355A (en) * | 2020-09-18 | 2020-11-27 | 湘潭华宇电炉制造有限公司 | Heat treatment heating furnace and heat treatment method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114733916A (en) * | 2022-03-04 | 2022-07-12 | 贵州捷盛钻具股份有限公司 | Hollow steel hot rolling method for drill rod, hollow steel, heat insulation box and hot rolling mill |
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Application publication date: 20211022 |
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