CN108004383A - Method for transformation in reforming unit and workpiece high/low temperature stove in high/low temperature stove - Google Patents
Method for transformation in reforming unit and workpiece high/low temperature stove in high/low temperature stove Download PDFInfo
- Publication number
- CN108004383A CN108004383A CN201810062877.1A CN201810062877A CN108004383A CN 108004383 A CN108004383 A CN 108004383A CN 201810062877 A CN201810062877 A CN 201810062877A CN 108004383 A CN108004383 A CN 108004383A
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- Prior art keywords
- door body
- workpiece
- low temperature
- chamber
- chilling chamber
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Classifications
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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
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
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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 Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The present invention provides method for transformation in reforming unit in a kind of high/low temperature stove and workpiece high/low temperature stove, it is related to Workpiece treating apparatus technical field.Reforming unit in high/low temperature stove, including：Door body group, door body group include the first door body, the second door body, the 3rd door body and the 4th door body；Chilling chamber, chilling chamber are used to perform workpiece cryogenic technology, and the side of chilling chamber is provided with for the first door body for workpiece disengaging；Reversing chamber, reversing chamber are used to perform tempering process to workpiece, are realized with the common opening and closing of the 4th door body by the second door body, the 3rd door body between reversing chamber and chilling chamber and connect or separate；And driving mechanism, driving mechanism are used to drive workpiece to circulate between chilling chamber, reversing chamber.This method is realized by using reforming unit in high/low temperature stove carries out high/low temperature conversion in stove to workpiece, and workpiece can be caused to obtain required characteristic, ensure process quality.
Description
Technical field
The present invention relates to Workpiece treating apparatus technical field, in particular to reforming unit in a kind of high/low temperature stove and
Method for transformation in workpiece high/low temperature stove.
Background technology
One of equipment that vacuum drying oven is regenerated as heat treatment industry renewal of the equipment, its major reason are vacuum drying oven processing
Product parts surface-brightening, low or non oxidizing, performance are good, precision is high, easily realized in vacuum drying oven production run it is energy saving, lower consumption, subtract dirt,
Belong to clean manufacturing equipment, meet the requirement of current environmental protection.Gas molecule is few in vacuum, and the free path of molecule becomes larger, therefore
The light rare metal that can not be obtained under normal pressure, refractory metal, rare metal and other specialty alloy materials etc. can be produced.
Vacuum metallurgy has the advantages such as low energy consumption, the rate of recovery be high, pollution-free, good in economic efficiency compared with conventional metallurgical, therefore
Increasingly it is valued by people.
But the research of vacuum metallurgy process is largely dependent upon the exploitation of vacuum metling equipment.With vacuum metallurgy
The continuous development of technology, vacuum metling equipment needs are constantly perfect, improve the degree of automation, make vacuum metling equipment to intelligence
Change, integrated direction development.
Temperature is the important technical parameter of metal smelt, and during metal smelt, the accurate control to temperature is often determined
The quality of product is determined.With electronics, the development of computer and network technologies, automation control system experienced combination type analog
Control system, centralized numerical control system, dcs, develop into field bus control system and Ethernet system
Stage.The development of control system shows the direction to decentralized, networking, intelligent development.Wherein, especially with production process certainly
Dynamicization, instrument monitoring diagnosis etc. networking tendency are the most notable.Distributed AC servo system is exactly that local computer passes through network system
System is monitored and controls to remote equipment, includes data acquisition, monitoring and the maintenance of equipment.System distributed AC servo system is large-scale
One of key technology of equipment safety stable operation, and Mechatronic Systems work efficiency and reliability are improved, carry out Predictive Maintenance
And the basis of precognition management.
Workpiece drops to low temperature from high temperature, and the case hardness and uniformity of workpiece can be better, improve the metallographic quality of workpiece.It is existing
There is some shortcomings for some equipment, it is impossible to realize the rapid conversion of high/low temperature, therefore, in order to improve the metallographic quality of workpiece,
Need to effectively realize and high/low temperature conversion is carried out to workpiece in a short time.
The content of the invention
It is an object of the invention to provide reforming unit in a kind of high/low temperature stove, it can pass through chilling chamber, reversing chamber, door
The cooperation of body group and driving mechanism, high/low temperature conversion is carried out easy to workpiece in stove.
Another object of the present invention is to provide method for transformation in a kind of workpiece high/low temperature stove, it uses above-mentioned height
Reforming unit in low temperature oven, by the use to all parts, it can realize the high/low temperature conversion to workpiece in stove.
What the embodiment of the present invention was realized in：
The embodiment provides reforming unit in a kind of high/low temperature stove, including：
Door body group, the door body group include the first door body, the second door body, the 3rd door body and the 4th door body；
Chilling chamber, the chilling chamber are used to perform workpiece cryogenic technology, and the side of the chilling chamber is provided with for supplying
First door body of workpiece disengaging；
Reversing chamber, the reversing chamber are used to perform tempering process to workpiece, lead between the reversing chamber and the chilling chamber
Cross second door body, the 3rd door body is realized with the common opening and closing of the 4th door body and connects or separate；With
Driving mechanism, the driving mechanism are used to drive workpiece to circulate between the chilling chamber, the reversing chamber.
In addition, reforming unit in the high/low temperature stove provided according to an embodiment of the invention, can also have what is added as follows
Technical characteristic：
In the alternative embodiment of the present invention, second door body is every unexpected winner.
In the alternative embodiment of the present invention, the 3rd door body is vacuum sealing door.
In the alternative embodiment of the present invention, the 4th door body is insulated door.
In the alternative embodiment of the present invention, the 3rd door body be arranged at second door body and the 4th door body it
Between, second door body is adjacent with the chilling chamber, and the 4th door body is adjacent with the reversing chamber.
In the alternative embodiment of the present invention, the driving mechanism includes driving motor, driving member and for carrying workpiece
Transmission parts, the transmission parts are spread to the reversing chamber from the chilling chamber, and the driving motor is driven by the driving member
Move the transmission parts.
The embodiment provides method for transformation in a kind of workpiece high/low temperature stove, use described in any of the above-described
Reforming unit in high/low temperature stove, the described method includes：
Cryogenic technology is performed to workpiece in chilling chamber；
The second door body, the 3rd door body and the 4th door body are opened, and workpiece is sent into reversing chamber from chilling chamber, turns off the 4th
Door body, the 3rd door body and the second door body；
Tempering process is performed to workpiece in reversing chamber.
In the alternative embodiment of the present invention, when performing cryogenic technology, it is passed through liquid nitrogen cooling to chilling chamber and keeps the temperature, deep cooling
Chilling chamber is heated to after technique to be then turned on the second door body, the 3rd door body and the 4th door body after room temperature.
In the alternative embodiment of the present invention, when performing tempering process, reversing chamber is vacuumized, temperature is heated up and protected
Temperature, then cools down again.
In the alternative embodiment of the present invention, when being passed through liquid nitrogen cooling to chilling chamber, -110 DEG C are cooled to；
When reversing chamber heats up temperature, 650 DEG C are warming up to.
The beneficial effects of the invention are as follows：
Reforming unit coordinates door body group to close or open by setting chilling chamber, reversing chamber in high/low temperature stove, then auxiliary
Workpiece is transported with driving mechanism so that workpiece can realize the conversion that high/low temperature is carried out in stove, be greatly reduced at deep cooling
Time interval between reason and temper, so that workpiece can have good process quality.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore be not construed as pair
The restriction of scope, for those of ordinary skill in the art, without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the schematic diagram of reforming unit in the high/low temperature stove of the embodiment of the present invention offer.
Icon：1- chilling chambers；The first door body of 2-；The second door body of 3-；The 3rd door body of 4-；The 4th door body of 5-；6- reversing chambers；7-
Driving mechanism.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.The present invention implementation being usually described and illustrated herein in the accompanying drawings
The component of example can be arranged and designed with a variety of configurations.
Therefore, below the detailed description of the embodiment of the present invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiments of the present invention, this area is common
Technical staff's all other embodiments obtained without creative efforts, belong to the model that the present invention protects
Enclose.
It should be noted that：Similar label and letter represents similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
In the description of the present invention, it is necessary to which explanation, the orientation or position relationship of " preceding " instruction of term are based on attached drawing
Shown orientation or position relationship, or the invention product using when the orientation usually put or position relationship, merely to
Easy to describe the present invention and simplify description, rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second " etc.
It is only used for distinguishing description, and it is not intended that instruction or hint relative importance.
In the description of the present invention, it is also necessary to explanation, unless otherwise clearly defined and limited, term " setting ",
" connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can be
Mechanically connect or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can be two
Connection inside element.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood in the present invention
In concrete meaning.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with or below second feature
Directly contacted including the first and second features, can also include the first and second features not be direct contact but by them it
Between other characterisation contact.Moreover, fisrt feature is on second feature, top and above to include fisrt feature special second
Directly over sign and oblique upper, or be merely representative of fisrt feature level height and be higher than second feature.Fisrt feature second feature it
Under, lower section and fisrt feature included below are immediately below second feature and obliquely downward, or be merely representative of fisrt feature level height
Less than second feature.
Embodiment
Fig. 1 is refer to, present embodiments provides reforming unit in a kind of high/low temperature stove, including：
Door body group, door body group include the first door body 2, the second door body 3, the 3rd door body 4 and the 4th door body 5；
Chilling chamber 1, chilling chamber 1 are used to perform workpiece cryogenic technology, the side of chilling chamber 1 be provided with for for workpiece into
The first door body 2 gone out；
Reversing chamber 6, reversing chamber 6 are used to perform tempering process to workpiece, pass through second between reversing chamber 6 and chilling chamber 1
Body 3, the 3rd door body 4 are realized with the common opening and closing of the 4th door body 5 and connect or separate；With
Driving mechanism 7, driving mechanism 7 are used to drive workpiece to circulate between chilling chamber 1, reversing chamber 6.
On door body group, particularly：
Second door body 3 is every unexpected winner.
3rd door body 4 is vacuum sealing door.
4th door body 5 is insulated door.
3rd door body 4 is arranged between the second door body 3 and the 4th door body 5, and the second door body 3 is adjacent with chilling chamber 1, the 4th
Body 5 is adjacent with reversing chamber 6.
First door body 2 is due to being in the position of workpiece disengaging, so also referred to as front door.
In addition, for each door body of door body group, be required for ensureing leakproofness, i.e., after door body is closed, deep cooling
Room 1 or reversing chamber 6 are required for certain leakproofness guarantee, could so ensure the quality of the high/low temperature conversion of workpiece.
On driving mechanism 7：
Driving mechanism 7 includes driving motor, driving member and the transmission parts for carrying workpiece, transmission parts and is spread from chilling chamber 1
Exhibition to reversing chamber 6, driving motor drives transmission parts by driving member.
Driving motor via reducer is slowed down, and may then pass through driving-chain or transmission belt as driving member, will
Driving force passes to transmission parts so that transmission parts can drive workpiece to carry out reciprocal movement in chilling chamber 1 and reversing chamber 6.
Transmission parts can be two rows of roller bearings being arranged side by side, and the same side of roller bearing has the tooth of fluted disc, then multiple roller bearings
Disk is driven by chain, so that workpiece can be moved with the rotation of roller bearing.
In addition, driving mechanism 7 can also include car locking and move back pull head, the power output position of car locking and driving member connects
And can be rotated with the work of driving motor, pull head and the assembling of unhook cylinder are moved back, can band by the work of unhook cylinder
The dynamic pull head that moves back is caught in or away from car locking, when being caught in car locking, transmission parts can be made to stop transmission so that workpiece is maintained at needs
Position, when away from car locking when, then driving member can continue to drive workpiece move as desired.
Except unhook cylinder, other devices that can realize straight reciprocating motion, such as oil cylinder, hydraulic cylinder can also be
It is this kind of.
It is using method for transformation in the workpiece high/low temperature stove of reforming unit in the high/low temperature stove：
Cryogenic technology is performed to workpiece in chilling chamber 1；
The second door body 3, the 3rd door body 4 and the 4th door body 5 are opened, and workpiece is sent into reversing chamber 6 from chilling chamber 1, then is closed
Close the 4th door body 5, the 3rd door body 4 and the second door body 3；
Tempering process is performed to workpiece in reversing chamber 6.
Wherein, when performing cryogenic technology, it is passed through liquid nitrogen cooling to chilling chamber 1 and keeps the temperature, by deep cooling after cryogenic technology
Room 1 is then turned on the second door body 3, the 3rd door body 4 and the 4th door body 5 after being heated to room temperature.Then again by driving mechanism 7 by workpiece
Move into reversing chamber 6.
Wherein, when performing tempering process, reversing chamber 6 is vacuumized, temperature is heated up and kept the temperature, is then cooled down again.
More specifically, when being passed through liquid nitrogen cooling to chilling chamber 1, -110 DEG C are cooled to；
When reversing chamber 6 heats up temperature, 650 DEG C are warming up to.
Insulated door, vacuum sealing door are opened after technique whole, every unexpected winner and the first door body 2, pass through driving mechanism 7
By workpiece transport apparatus.
The principle of the present invention is：
Cryogenic technology refers to using liquid nitrogen as refrigerant, in the method that the temperature less than -130 DEG C handles workpiece.It is deep
Cold treatment in the case where not reducing workpiece strength and hardness, can significantly improve the toughness of workpiece.
Cryogenic treating process is divided into two kinds of liquid processes and gas method., can rapidly by putting the workpiece in chilling chamber 1
Reduce the temperature of workpiece.
And chilling chamber 1 is heated into room temperature also after cryogenic technology, can so prevent the temperature mistake in chilling chamber 1
It is low, avoid opening something unexpected happened after the second door body 3, the 3rd door body 4 and the 4th door body 5.
After subzero treatment is completed, workpiece can be sent directly into reversing chamber 6 by driving mechanism 7, and without in addition taking
Other places carry out temper, can so greatly reduce the time interval between subzero treatment and temper so that workpiece
Metallographic quality can be more preferable.
And after completing all techniques, driving mechanism 7 easily can be sent out workpiece again, easy to be carried out to next workpiece
The conversion of high/low temperature.
And front door, the presence every unexpected winner, vacuum sealing door and insulated door, also so that chilling chamber 1 and reversing chamber 6 are performing
During respective process, there is the guarantee of an environment, also avoid chilling chamber 1 and reversing chamber 6 from having interference between each other.
The present invention have devised reforming unit in the high/low temperature stove and coordinate workpiece height by the observation to existing demand
Method for transformation operates in low temperature oven so that the high/low temperature conversion of workpiece can realize in stove, without handling a place
In addition it is separately provided, reduces the stand-by period of centre, workpiece can be caused to have better performance and metallographic quality.
In conclusion reforming unit coordinates door body group by setting chilling chamber 1, reversing chamber 6 in the high/low temperature stove of the present invention
To close or open, then it is aided with driving mechanism 7 to transport workpiece so that workpiece can be realized carries out turning for high/low temperature in stove
Change, the time interval between subzero treatment and temper is greatly reduced, so that workpiece can have at good technique
Manage quality.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this area
For art personnel, the invention may be variously modified and varied.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
- A kind of 1. reforming unit in high/low temperature stove, it is characterised in that including：Door body group, the door body group include the first door body, the second door body, the 3rd door body and the 4th door body；Chilling chamber, the chilling chamber are used to perform workpiece cryogenic technology, and the side of the chilling chamber is provided with for supplying workpiece First door body of disengaging；Reversing chamber, the reversing chamber are used to perform tempering process to workpiece, pass through institute between the reversing chamber and the chilling chamber State the second door body, the 3rd door body is realized with the common opening and closing of the 4th door body and connects or separate；WithDriving mechanism, the driving mechanism are used to drive workpiece to circulate between the chilling chamber, the reversing chamber.
- 2. reforming unit in high/low temperature stove according to claim 1, it is characterised in that second door body is every unexpected winner.
- 3. reforming unit in high/low temperature stove according to claim 1, it is characterised in that the 3rd door body is vacuum sealing Door.
- 4. reforming unit in high/low temperature stove according to claim 1, it is characterised in that the 4th door body is insulated door.
- 5. reforming unit in high/low temperature stove according to claim 1, it is characterised in that the 3rd door body is arranged at described Between second door body and the 4th door body, second door body is adjacent with the chilling chamber, the 4th door body with described time Fiery room is adjacent.
- 6. reforming unit in high/low temperature stove according to claim 1, it is characterised in that the driving mechanism includes driving electricity Machine, driving member and the transmission parts for carrying workpiece, the transmission parts are spread to the reversing chamber, the drive from the chilling chamber Dynamic motor drives the transmission parts by the driving member.
- 7. method for transformation in a kind of workpiece high/low temperature stove, it is characterised in that used claim 1-6 any one of them height Reforming unit in warm stove, the described method includes：Cryogenic technology is performed to workpiece in chilling chamber；The second door body, the 3rd door body and the 4th door body are opened, and workpiece is sent into reversing chamber from chilling chamber, turns off the 4th Body, the 3rd door body and the second door body；Tempering process is performed to workpiece in reversing chamber.
- 8. method for transformation in workpiece high/low temperature stove according to claim 7, it is characterised in that when performing cryogenic technology, to Chilling chamber is passed through liquid nitrogen cooling and keeps the temperature, and is heated to chilling chamber after cryogenic technology to be then turned on the second door body, after room temperature Three door body and the 4th door body.
- 9. method for transformation in workpiece high/low temperature stove according to claim 8, it is characterised in that right when performing tempering process Reversing chamber vacuumizes, and temperature is heated up and kept the temperature, is then cooled down again.
- 10. method for transformation in workpiece high/low temperature stove according to claim 9, it is characterised in that be passed through liquid nitrogen to chilling chamber During cooling, -110 DEG C are cooled to；When reversing chamber heats up temperature, 650 DEG C are warming up to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810062877.1A CN108004383A (en) | 2018-01-23 | 2018-01-23 | Method for transformation in reforming unit and workpiece high/low temperature stove in high/low temperature stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810062877.1A CN108004383A (en) | 2018-01-23 | 2018-01-23 | Method for transformation in reforming unit and workpiece high/low temperature stove in high/low temperature stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108004383A true CN108004383A (en) | 2018-05-08 |
Family
ID=62066407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810062877.1A Pending CN108004383A (en) | 2018-01-23 | 2018-01-23 | Method for transformation in reforming unit and workpiece high/low temperature stove in high/low temperature stove |
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| Country | Link |
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| CN (1) | CN108004383A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113621901A (en) * | 2021-08-09 | 2021-11-09 | 中国航空制造技术研究院 | Cryogenic heat treatment device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5868871A (en) * | 1996-06-06 | 1999-02-09 | Dowa Mining Co., Ltd. | Method and apparatus for carburizing, quenching and tempering |
| CN202220190U (en) * | 2011-08-05 | 2012-05-16 | 上海汇森益发工业炉有限公司 | Continuous type cryogenic treatment and tempering equipment |
| CN103031418A (en) * | 2011-10-10 | 2013-04-10 | 上海汇森益发工业炉有限公司 | Continuous cryogenic treating and tempering equipment |
| CN103525997A (en) * | 2013-09-29 | 2014-01-22 | 三明学院 | High-speed steel cryogenic treatment process |
| CN207918916U (en) * | 2018-01-23 | 2018-09-28 | 江苏石川岛丰东真空技术有限公司 | Reforming unit in high/low temperature stove |
-
2018
- 2018-01-23 CN CN201810062877.1A patent/CN108004383A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5868871A (en) * | 1996-06-06 | 1999-02-09 | Dowa Mining Co., Ltd. | Method and apparatus for carburizing, quenching and tempering |
| CN202220190U (en) * | 2011-08-05 | 2012-05-16 | 上海汇森益发工业炉有限公司 | Continuous type cryogenic treatment and tempering equipment |
| CN103031418A (en) * | 2011-10-10 | 2013-04-10 | 上海汇森益发工业炉有限公司 | Continuous cryogenic treating and tempering equipment |
| CN103525997A (en) * | 2013-09-29 | 2014-01-22 | 三明学院 | High-speed steel cryogenic treatment process |
| CN207918916U (en) * | 2018-01-23 | 2018-09-28 | 江苏石川岛丰东真空技术有限公司 | Reforming unit in high/low temperature stove |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113621901A (en) * | 2021-08-09 | 2021-11-09 | 中国航空制造技术研究院 | Cryogenic heat treatment device |
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