CN106480276A - A kind of Controlled Atmosphere Protect heat treatment method - Google Patents
A kind of Controlled Atmosphere Protect heat treatment method Download PDFInfo
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- CN106480276A CN106480276A CN201610865431.3A CN201610865431A CN106480276A CN 106480276 A CN106480276 A CN 106480276A CN 201610865431 A CN201610865431 A CN 201610865431A CN 106480276 A CN106480276 A CN 106480276A
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- Prior art keywords
- heat treatment
- controlled atmosphere
- atmosphere
- treatment method
- protect heat
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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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
Abstract
The invention discloses a kind of Controlled Atmosphere Protect heat treatment method, belong to technical field of metal heat treatment.The method includes workpiece being preheated to design temperature and being incubated after 10～30min, sends into Controlled Atmosphere Protect Equipment for Heating Processing and carries out Controlled Atmosphere Protect heat treatment；Described design temperature is below 560 DEG C.The Controlled Atmosphere Protect heat treatment method of the present invention; under the premise of ensureing that parts are non-oxidizing; effectively reduce heat time heating time in controlled atmosphere equipment for the parts; thus reducing the protective gas consumption in heating up process; improve the utilization rate of Atmosphere controlling heat-treatment equipment simultaneously; and shorten parts in the dangerous temperature interval time of staying, improve safety.
Description
Technical field
The invention belongs to technical field of metal heat treatment is and in particular to a kind of Controlled Atmosphere Protect heat treatment method.
Background technology
Heat treatment refers to material in the solid state, by the means of heating, insulation and cooling, to obtain intended tissue and performance
A kind of metal heat processing technique.Metal heat treatmet is one of important process in machine-building, compared with other processing technique,
Heat treatment does not typically change the shape of workpiece and overall chemical composition, but the microscopic structure by change inside workpiece, or
Change the chemical composition of surface of the work, give or improve the serviceability of workpiece.
In order that surface of the work do not aoxidize, decarburization, burning phenomenon or thermo-chemical treatment is carried out to workpiece, logical into stove
So that the atmosphere of composition, referred to as Controlled Atmosphere Protect heat treatment can be controlled.Protective atmosphere can be neutral gas (N2) or lazy
Property gas (Ar) or reducibility gas (H2)；Most of protective atmospheres are (as CO, CO by multiple gases2、H2、CH4、
H2O、N2Deng) mixing composition.Workpiece heats not only achievable non-oxidation no decarburization heat treatment under protective atmosphere, improves at heat
Reason quality, can also carry out the special thermal treatment such as carburizing, decarburization；And can achieve mechanization and Automated condtrol, make productivity ratio
It is improved, labor condition is improved.
The superiority of Atmosphere controlling heat-treatment is as follows：1) realize non-oxidation no decarburization and carburetting heat treatment, thus improve work
The surface quality of part and mechanical performance, reduce the allowance of part and the scaling loss amount of steel, therefore can save man-hour and energy consumption,
Save metal material；2) realize controlled carburizing, phosphorus content, carbon profile and the carburized layer of piece surface can be accurately controlled
Thickness, thus improve the mechanical performance of carburized parts, stablize the quality of carburization process；3) realize special Technology for Heating Processing,
As the decarburizing annealing of stalloy, carbon restoration annealing of rolled steel etc.；4) realize mechanization and automatization, raise labour productivity,
Improve working conditions.
Atmosphere controllable multi-purpose furnace is a kind of advanced heat treatment process equipment being used widely at present, is mainly used in zero
The Controlled Atmosphere Protect quenching of part, normalizing, gas carburizing, dry cyaniding etc. are processed, and have few oxidation, the no processing such as decarburization
Feature.General operation method when carrying out heat treatment using atmosphere controllable multi-purpose furnace is both at home and abroad at present：By parts in heat
Put in process frock and be sent directly into heating in burner hearth after finishing, heat treatment produces after finishing.
The Controlled Atmosphere Protect heat treatment heating means using at present have following defect：
1. in the low-temperature heat stage, hardly there is oxidation and decarburization in parts, now carry out atmosphere protection and belong to waste,
Improve the heat treatment process cost of parts；
2. in use, the atmosphere within burner hearth is flammable atmosphere to atmosphere controllable multi-purpose furnace, when below 750 DEG C,
If fuel gas reaches certain limit it may occur that exploding with the mixed proportion of air；And when more than 750 DEG C, no matter mixing
Ratio is how many, all will not explode, so 750 DEG C of safe temperatures being to ensure that atmosphere controllable multi-purpose furnace safe operation.Adopt
Carry out atmosphere controllable multi-purpose furnace operation with existing heating means, when parts useful load is larger, because parts temperature is low, hot
Capacity is big, the temperature in burner hearth can be made to be down to less than 750 DEG C, and stop for a long time below safe temperature, there is larger peace
Full hidden danger.
Content of the invention
It is an object of the invention to provide a kind of Controlled Atmosphere Protect heat treatment method, solve existing Atmosphere controlling heat-treatment and add
Work high cost, there is larger potential safety hazard.
In order to realize object above, the technical solution adopted in the present invention is：
A kind of Controlled Atmosphere Protect heat treatment method, including workpiece being preheated to design temperature and is incubated after 10～30min,
Send into Controlled Atmosphere Protect Equipment for Heating Processing and carry out Controlled Atmosphere Protect heat treatment；Described design temperature is below 560 DEG C.
When heating below 560 DEG C, general iron and steel parts hardly aoxidize, the also very faint (decarburization of skin decarburization
Degree is very faint, negligible, and simultaneously in follow-up heat treatment insulating process, the carbon potential that protective atmosphere is provided can very easily
The slight decarburization of supplementary surface of the work), so when heating below 560 DEG C, can use common tempering furnace preheating to replace directly use
Atmosphere controllable multi-purpose furnace is heated.After preheating by truck system by preheat after Workpiece transfer to atmosphere controllable multi-purpose furnace in
Carry out heat treatment.
The Controlled Atmosphere Protect heat treatment method of the present invention, is workpiece to be preheated to design temperature (less than 560 DEG C) and protects
After warm 10～30min, send into Controlled Atmosphere Protect Equipment for Heating Processing and carry out Controlled Atmosphere Protect heat treatment；The method has as follows
Beneficial effect：
1. save：By warm-up operation, significantly shorten parts on the basis of hardly increasing heating energy consumption can
Heating-up time in control atmosphere multipurpose furnace, and then the consumption of atmosphere cracked gas is greatly reduced, decrease controlled gas simultaneously
The electric energy loss of atmosphere multipurpose furnace circulating cooling system；
2. improve the utilization rate of expensive equipment：The one-time investment of atmosphere controllable multi-purpose furnace will be far longer than common tempering
Stove, and its a lot of working ability has irreplaceability, using the method for common tempering furnace preheating, can significantly shorten parts
The time of staying in atmosphere controllable multi-purpose furnace, improve the production efficiency of atmosphere controllable multi-purpose furnace, greatly having played can
The value of control atmosphere multipurpose furnace；
3. safety：Using this programme, workpiece is preheated, can significantly shorten atmosphere controllable multi-purpose furnace in 750 DEG C of safety
Temperature residence times below, improves the safety producing.
Described design temperature is less than 540 DEG C.In view of heat treatment furnace temperature fluctuating factor, highest preheating temperature is adjusted to slightly
Theoretical temperatures less than 560 DEG C, to avoid oxidation, decarburization.
Preferably, described design temperature is 500～540 DEG C.
Preheating time determines according to batch size, is incubated 10～30min after stove reaches design temperature again.
Described preheating is carried out in air atmosphere.Warm does not need Controlled Atmosphere Protect.
Preferably, described preheating is carried out in tempering furnace.
Described Controlled Atmosphere Protect Equipment for Heating Processing is atmosphere controllable multi-purpose furnace.
The Controlled Atmosphere Protect heat treatment method of the present invention, is tempered using common under the design temperature less than 540 DEG C
Stove preheats to workpiece, the workpiece after preheating is delivered to carry out in atmosphere controllable multi-purpose furnace quenching, normalizing, carburizing etc. are processed；
The method, under the premise of ensureing that parts are non-oxidizing, effectively reduces heat time heating time in controlled atmosphere equipment for the parts,
Thus reducing the protective gas consumption in heating up process, improve the utilization rate of Atmosphere controlling heat-treatment equipment simultaneously, and
Shorten parts in the dangerous temperature interval time of staying, improve safety.
Described Controlled Atmosphere Protect heat treatment be quenching, normalizing, annealing, carburizing or carbonitriding process.The inventive method
It is applied to Controlled Atmosphere Protect Field of Heat-treatment, be primarily adapted for use in and Controlled Atmosphere Protect is carried out using atmosphere controllable multi-purpose furnace quench
The heat treatment processes such as fire, normalizing, gas carburizing, dry cyaniding.
Specific embodiment
With reference to specific embodiment, the present invention is further illustrated.
Embodiment 1
The Controlled Atmosphere Protect heat treatment method of the present embodiment, is first workpiece to be delivered to common tempering furnace (air atmosphere) to enter
Row preheating, after being preheated to 540 DEG C of design temperature and being incubated 10min, sends into Controlled Atmosphere Protect Equipment for Heating Processing and carries out controlled gas
Atmosphere protects Quenching Treatment.
Embodiment 2
The Controlled Atmosphere Protect heat treatment method of the present embodiment, is first workpiece to be delivered to common tempering furnace (air atmosphere) to enter
Row preheating, after being preheated to 520 DEG C of design temperature and being incubated 20min, sends into Controlled Atmosphere Protect Equipment for Heating Processing and carries out controlled gas
Atmosphere protects normalized treatment.
Embodiment 3
The Controlled Atmosphere Protect heat treatment method of the present embodiment, is first workpiece to be delivered to common tempering furnace (air atmosphere) to enter
Row preheating, after being preheated to 500 DEG C of design temperature and being incubated 30min, sends into Controlled Atmosphere Protect Equipment for Heating Processing and carries out controlled gas
Atmosphere protective gas Carburization Treatment.
Embodiment 4
The Controlled Atmosphere Protect heat treatment method of the present embodiment, is first workpiece to be delivered to common tempering furnace (air atmosphere) to enter
Row preheating, after being preheated to 530 DEG C of design temperature and being incubated 15min, sends into Controlled Atmosphere Protect Equipment for Heating Processing and carries out controlled gas
Atmosphere protective gas carbo-nitriding is processed.
Compared with prior art, the Controlled Atmosphere Protect heat treatment method of embodiment has the advantage that：
1) reduce the protective gas consumption in Controlled Atmosphere Protect heat treatment；
2) improve the service efficiency of Atmosphere controlling heat-treatment equipment；
3) shorten the time of staying in dangerous temperature interval, improve the safety that Atmosphere controlling heat-treatment produces.
Verified by embodiment, the Controlled Atmosphere Protect heat treatment method introducing the present invention mainly has the receipts of three aspects
Benefit：
1. consume the income that the minimizing of articles for use usage amount brings：
Protective gas is saved：Using the pre-heating mean of the present invention, taking single stove useful load 500kg as a example, can reduce controlled
Intensification 1～1.5h heat time heating time in atmosphere multipurpose furnace, can be greatly reduced the usage amount in heat temperature raising stage protective gas
And in this process due to power consumption produced by recirculated cooling water motor rotation (as long as atmosphere controllable multi-purpose furnace open,
Hot cell fan is just in starting state；When furnace temperature is more than 150 DEG C, just must start up cooling recirculation system).
2. utilization rate of equipment and installations improves the income producing：
The one-time investment of atmosphere controllable multi-purpose furnace will be far longer than common tempering furnace, and its a lot of function aborning
Can not be substituted by conventional equipment, using the method for common tempering furnace preheating, can significantly shorten parts multiplex in controlled atmosphere
The time of staying in stove, improve the production efficiency of atmosphere controllable multi-purpose furnace.
3. security gain：
In use, the atmosphere within burner hearth is flammable atmosphere to atmosphere controllable multi-purpose furnace, when below 750 DEG C, such as
Fruit fuel gas reaches certain limit it may occur that exploding with the mixed proportion of air, and when more than 750 DEG C, no matter mixing ratio
Example be how many, all will not explode, thus 750 DEG C be atmosphere controllable multi-purpose furnace safe operation safe temperature.Do not preheating
In the case of when in high volume loading parts, because parts temperature is low, thermal capacity big, the temperature in burner hearth can be made to be down to 750
Below DEG C, and stop for a long time below safe temperature, there is very strong potential safety hazard.Using this programme, workpiece is carried out pre-
Heat, can significantly shorten atmosphere controllable multi-purpose furnace in 750 DEG C of safe temperature residence times below, improve the safety producing.
Claims (7)
1. a kind of Controlled Atmosphere Protect heat treatment method it is characterised in that：Including workpiece being preheated to design temperature and is incubated 10
After～30min, send into Controlled Atmosphere Protect Equipment for Heating Processing and carry out Controlled Atmosphere Protect heat treatment；Described design temperature is 560
Below DEG C.
2. Controlled Atmosphere Protect heat treatment method according to claim 1 it is characterised in that：Described design temperature is less than
540℃.
3. Controlled Atmosphere Protect heat treatment method according to claim 2 it is characterised in that：Described design temperature is 500
～540 DEG C.
4. Controlled Atmosphere Protect heat treatment method according to claim 1 it is characterised in that：Described preheating is in air gas
Carry out under atmosphere.
5. the Controlled Atmosphere Protect heat treatment method according to claim 1 or 4 it is characterised in that：Described preheating is to return
Carry out in stove.
6. Controlled Atmosphere Protect heat treatment method according to claim 1 it is characterised in that：Described Controlled Atmosphere Protect heat
Processing equipment is atmosphere controllable multi-purpose furnace.
7. the Controlled Atmosphere Protect heat treatment method according to claim 1 or 6 it is characterised in that：Described controlled atmosphere is protected
Shield heat treatment be quenching, normalizing, annealing, carburizing or carbonitriding process.
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| CN201610865431.3A CN106480276A (en) | 2016-09-29 | 2016-09-29 | A kind of Controlled Atmosphere Protect heat treatment method |
Applications Claiming Priority (1)
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| CN201610865431.3A CN106480276A (en) | 2016-09-29 | 2016-09-29 | A kind of Controlled Atmosphere Protect heat treatment method |
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| CN106480276A true CN106480276A (en) | 2017-03-08 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101570819A (en) * | 2009-06-18 | 2009-11-04 | 柳州金茂机械有限公司 | Heating processing technology for wear-resistant cutting board |
| CN102586583A (en) * | 2012-03-20 | 2012-07-18 | 中国重汽集团济南动力有限公司 | Heat treatment process for free forging die for medium carbon steel |
| CN202465814U (en) * | 2012-02-07 | 2012-10-03 | 北京机电研究所 | Double-metal band-saw nitrogen spray-quenching heat treatment production line |
| CN103834911A (en) * | 2012-11-27 | 2014-06-04 | 大连经济技术开发区圣洁真空技术开发有限公司 | New workpiece surface low-temperature carbonitriding method |
| CN103849723A (en) * | 2012-11-29 | 2014-06-11 | 宣中光 | Production line equipment for enhancing physical property of steel member |
-
2016
- 2016-09-29 CN CN201610865431.3A patent/CN106480276A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101570819A (en) * | 2009-06-18 | 2009-11-04 | 柳州金茂机械有限公司 | Heating processing technology for wear-resistant cutting board |
| CN202465814U (en) * | 2012-02-07 | 2012-10-03 | 北京机电研究所 | Double-metal band-saw nitrogen spray-quenching heat treatment production line |
| CN102586583A (en) * | 2012-03-20 | 2012-07-18 | 中国重汽集团济南动力有限公司 | Heat treatment process for free forging die for medium carbon steel |
| CN103834911A (en) * | 2012-11-27 | 2014-06-04 | 大连经济技术开发区圣洁真空技术开发有限公司 | New workpiece surface low-temperature carbonitriding method |
| CN103849723A (en) * | 2012-11-29 | 2014-06-11 | 宣中光 | Production line equipment for enhancing physical property of steel member |
Non-Patent Citations (1)
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| 田长生 主编: "《金属材料及热处理》", 31 May 1987, 西北工业大学出版社 * |
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