CN109530685A - Vacuum degreasing sintered forming method - Google Patents
Vacuum degreasing sintered forming method Download PDFInfo
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- CN109530685A CN109530685A CN201811641712.6A CN201811641712A CN109530685A CN 109530685 A CN109530685 A CN 109530685A CN 201811641712 A CN201811641712 A CN 201811641712A CN 109530685 A CN109530685 A CN 109530685A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
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Abstract
The present invention provides a kind of vacuum-sintering forming methods, including feeding；It vacuumizes: degreasing: being passed through current-carrying gas into vacuum degreasing fritting furnace, it is heated up and is vacuumized according to preset degreasing heating curve, it detects the air pressure in the area Yi San and catches the air pressure of wax tank group, and by the vacuum degree that the flow of adjusting current-carrying gas and adjusting catch wax tank group the difference of the air pressure in the area Yi San and the air pressure for catching wax tank group being maintained in setting pressure differential range, the steam wax generated in effective heating area follows current-carrying gas to enter and catches in wax tank group；High temperature sintering and cooling.In the technical scheme, current-carrying gas flow is controlled according to the air pressure of the area Yi San and effective heating area and catches the vacuum degree of cured tank group, so that the steam wax in effective heating area can be directly entered without the inner wall of furnace tube and catch in wax tank, compared with prior art, steam wax collecting effect is more preferable, and pollution to furnace body can be effectively reduced, reduce the influence to blank sintering quality next time.
Description
Technical field
The present invention relates to industrial furnace technical field more particularly to a kind of vacuum degreasing sintered forming methods.
Background technique
Conventional dewaxing technique be arranged outside furnace body it is vertical or it is horizontal catch wax tank, horizontal wax tank of catching is directly connected to furnace wall lower part
And be connected with vertical wax tank of catching, vertical wax tank side of catching is connected to vacuum pump group.During the sintering process, vacuum pump is persistently to furnace body
It vacuumizes；Furnace body temperature rises, and binder and forming agent gradually gasify, and are extracted out by vacuum pump group, and pass through cooling system
It condenses in and catches in wax tank.
Although most binder or forming agent can be received into and catch in wax tank by traditional dewaxing device, due to binder
Or forming agent is to exist in gaseous form, but be provided with cooling waterproof layer on the inside of furnace wall in high-temperature furnace body, will lead to part
Binder or forming agent just solidify on furnace wall when being also not drawn into and catching in wax tank, not only pollute in this way to furnace body, and
And the quality that primary production is sintered under the influence of being possible to.
Summary of the invention
The main object of the present invention is to provide a kind of vacuum degreasing sintered forming method, it is intended to solve dewaxing when sintering process
The steam wax that stage generates, which is removed, is not thorough the caused furnace body pollution problem low with sintering quality.
To achieve the above object, vacuum degreasing sintered forming method proposed by the present invention is implemented described vacuum degreasing sintered
The vacuum degreasing sintered system of forming method includes vacuum degreasing fritting furnace and catches wax tank group, and the vacuum degreasing fritting furnace includes
Furnace tube is set to intracorporal enclosed by thermal insulation layer of the furnace tube and sets the effective heating area formed, by the thermal insulation layer and institute
It states the area Yi San that the inner wall of furnace tube is formed and catches ceratuba road through the thermal insulation layer and the furnace tube, it is described
The one end for catching ceratuba road is connected to the effective heating area, catches wax tank group described in the other end connection for catching ceratuba road, described true
Empty degreasing sintered forming method includes:
1) feeding: blank to be sintered is put into the effective heating area of the vacuum degreasing fritting furnace:
2) it vacuumizes: vacuumize process being carried out to the vacuum degreasing fritting furnace and the wax tank group of catching, is set until reaching
Level pressure force value；
3) degreasing: being passed through current-carrying gas in Xiang Suoshu vacuum degreasing fritting furnace, carries out according to preset degreasing heating curve
It heats up and vacuumizes, and detect the air pressure and the air pressure for catching wax tank group in the area Yi San, and according to the gas in the area Yi San
Pressure and the difference of the air pressure for catching wax tank group adjust the current-carrying gas flow and adjusting described in catch the vacuum degree of wax tank group,
So that the difference of the air pressure in the area Yi San and the air pressure for catching wax tank group is maintained in setting pressure differential range, it is described effective
The steam wax generated in heating zone is followed to catch described in the current-carrying gas warp described in the entrance of ceratuba road and be caught in wax tank group；
4) high temperature sintering；
5) cooling.
Preferably, in the degreasing stage, the air pressure in the area Yi San is greater than the air pressure for catching wax tank group, and described sets
Determining pressure differential range is 10K pa~30K pa.
Preferably, the vacuum degreasing sintered system includes vacuum pump group, and wax is caught with described in one end of the vacuum pump group
Tank group connection, and catch wax tank group by described vacuumize process carried out to the furnace tube, the other end of the vacuum pump group with
The furnace tube connection, and it is passed through gas into the furnace tube, the valve size by adjusting the vacuum pump group adjusts institute
State the vacuum degree for catching wax tank group.
Preferably, the degreasing heating curve are as follows: be heated to 500~600 from room temperature with the heating rate of 1~5 DEG C/min
DEG C, and keep the temperature 1~2 hour.
Preferably, in the vacuumizing phase, the setup pressure value is 5 pas~20 pas.
Preferably, in the high temperature sintering stage, after terminating in the degreasing stage, with the heating of 5~20 DEG C/min
1100~1500 DEG C of rate, keep the temperature 1~2 hour.
It preferably, further include that after terminating in the degreasing stage, stopping is passed through current-carrying gas in the high temperature sintering stage
Body, and after being evacuated to target pressure value, it is passed through the protective gas of preset flow.
Preferably, the current-carrying gas is a kind of in inert gas, hydrogen or nitrogen.
In the degreasing stage of the vacuum degreasing sintered forming method of the present invention, heat up according to preset degreasing heating curve
And vacuumize, detect the air pressure in the area Yi San and catch the air pressure of wax tank group, when the area Yi San air pressure and catch wax tank group air pressure difference
When value reaches setting value, current-carrying gas is passed through into vacuum degreasing fritting furnace, the steam wax generated in effective heating area follows load
Gas body is caught the entrance of ceratuba road and is caught in wax tank group.In the technical scheme, the gas packet within the degreasing stage, effective heating area
It includes current-carrying gas and steam is cured, since the generation of steam wax is so that effective heating area is caught the pressure in wax tank group and constantly changed,
By control the area Yi San and effective heating area air pressure difference in a certain range, enable to the steam in effective heating area
Wax can be directly entered without the inner wall of furnace tube and catch in wax tank, and compared with prior art, steam wax collecting effect is more preferable, and into
One step reduces steam wax and is set in probability on the inner wall of furnace tube, can effectively reduce the pollution to furnace body, reduces to next
The influence of secondary blank sintering quality.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the flow chart of vacuum degreasing sintered forming method in the embodiment of the present invention；
Fig. 2 is the schematic diagram of vacuum degreasing sintered system in the embodiment of the present invention；
Fig. 3 is the cross-sectional view of vacuum degreasing fritting furnace in the embodiment of the present invention.
Drawing reference numeral explanation:
| Label | Title | Label | Title |
| 100 | Vacuum degreasing fritting furnace | 201 | It is horizontal to catch wax tank |
| 110 | Furnace tube | 202 | It is vertical to catch wax tank |
| 111 | Thermal insulation layer | 300 | Vacuum pump group |
| 112 | Effective heating area | 400 | Pressure difference control device |
| 113 | The area Yi San | 500 | Cooling device |
| 114 | Catch ceratuba road | 600 | Transformer |
| 200 | Catch wax tank group | 700 | Control cabinet |
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should
When particular pose changes, then directionality instruction also correspondingly changes correspondingly.
In addition, the description for being such as related to " first ", " second " in the present invention is used for description purposes only, and should not be understood as
Its relative importance of indication or suggestion or the quantity for implicitly indicating indicated technical characteristic.Define as a result, " first ",
The feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple " contain
Justice is at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " connection ", " fixation " etc. shall be understood in a broad sense,
For example, " fixation " may be a fixed connection, it may be a detachable connection, or integral；It can be mechanical connection, be also possible to
Electrical connection；It can be directly connected, the connection inside two elements or two can also be can be indirectly connected through an intermediary
The interaction relationship of a element, unless otherwise restricted clearly.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
It in addition, the technical solution between each embodiment of the present invention can be combined with each other, but must be general with this field
Based on logical technical staff can be realized, it will be understood that when the combination of technical solution appearance is conflicting or cannot achieve this
The combination of technical solution is not present, also not the present invention claims protection scope within.
Fig. 1, Fig. 2 and Fig. 3 are please referred to, the vacuum degreasing sintered system of the vacuum degreasing sintered forming method of the present invention is implemented,
Including vacuum degreasing fritting furnace 100 and wax tank group 200 is caught, vacuum degreasing fritting furnace 100 includes furnace tube 110, is set to furnace tube
Interior being enclosed by thermal insulation layer 111 sets the effective heating area 112 formed, forms excessive dissipate by the inner wall of thermal insulation layer 111 and furnace tube 110
Area 113 and ceratuba road 114 is caught through thermal insulation layer 111 and furnace tube 110, catches one end connection effectively heating in ceratuba road 114
Wax tank group 200 is caught in area 112, the other end connection for catching ceratuba road 114, and referring to Fig. 1, vacuum degreasing sintered forming method includes:
1) feeding: blank to be sintered is put into the effective heating area 112 of vacuum degreasing fritting furnace 100:
It should be noted that the material of thermal insulation layer 111 be preferably carbon felt or other high temperature insulating materials such as polycrystalline not
Come mineral wool and corundum.By setting thermal insulation layer 111 in furnace tube 110, the space in furnace tube can be divided to form effective add
Heater and the bracket for bearing blank to be sintered is arranged in hot-zone 112 and the area Yi San 113 in effective heating area 112.Furnace tube
It is provided with inlet channel on body 110, the gas entered through inlet channel, which overflows to dissipate through the area Yi San 113, reaches effective heating area 112.Every
The setting of thermosphere 111 can be by shield heat away in effective heating area 112, and the setting in the area Yi San 113, which can will enter, effectively to be added
The gas equalization of hot-zone 112.It is understood that thermal insulation layer 111 has certain hole, it can be used in the disengaging of gas,
Simultaneously as the presence of thermal insulation layer 111 to can have certain pressure difference between the area Yi San 113 and effective heating area 112.
2) it vacuumizes: to vacuum degreasing fritting furnace 100 and the progress vacuumize process of wax tank group 200 is caught, until reaching setting
Pressure value；
Vacuum degreasing sintered system further includes vacuum pump group 300, and one end of vacuum pump group 300 is connected to wax tank group 200 is caught,
And vacuumize process is carried out to furnace tube 110 by catching wax tank group 200, until reaching setup pressure value, it is preferable that setting pressure
Value is 5 pas~20 pas, such as 8 pas, 10 pas, 15 pas, 18 pas etc..
It should be noted that catch wax tank group 200 include it is sequentially connected it is horizontal catch wax tank 201 and it is vertical catch wax tank 202, and
Horizontal wax tank 201 of catching is arranged close to vacuum degreasing fritting furnace 100, and is located at the lower section of vacuum degreasing fritting furnace 100, pressure difference control
Device 400 detects the horizontal air pressure caught in wax tank 201, and vertical wax tank 202 of catching is connect with vacuum pump group 300.When vacuumizing, close
The inlet channel of vacuum degreasing fritting furnace 100 simultaneously starts vacuum pump group 300, and vacuum pump group 300 is vertical to catch wax tank 202, horizontal
It catches wax tank 201 and vacuum degreasing fritting furnace 100 carries out vacuumize process.It is understood that when vacuumizing, effective heating area
Air in 112 is exhausted prior to the air in the area Yi San 113, i.e., effective heating area 112 reaches negative pressure prior to the area Yi San 113.
3) degreasing: being passed through current-carrying gas into vacuum degreasing fritting furnace 100, is risen according to preset degreasing heating curve
Temperature simultaneously vacuumizes, and detects the air pressure in the area Yi San 113 and catches the air pressure of wax tank group 200, and according to the air pressure in the area Yi San 113 and catches wax
The difference of the air pressure of tank group 200 adjusts the flow of current-carrying gas and catches the vacuum degree of cured tank group 200, so that the area Yi San 113
The difference of air pressure and the air pressure for catching wax tank group 200 is maintained in setting pressure differential range, the steam wax generated in effective heating area 112
It follows current-carrying gas to be caught the entrance of ceratuba road 114 to catch in wax tank group 200；
Vacuum degreasing sintered system further includes pressure difference control device 400, and pressure difference control device 400 is connect with furnace tube 110
And the air pressure in the area Yi San 113 is detected, pressure difference control device 400 also catches the gas of wax tank group 200 with catching wax tank group 200 and connect and detect
Pressure.One end of vacuum pump group 300 is connected to wax tank group 200 is caught, and the other end of vacuum pump group 300 is connect with furnace tube 110, and to
It is passed through in furnace tube 110 after gas vacuumizes, the degreasing of the side Bian Shengwen.Current-carrying is passed through into vacuum degreasing fritting furnace 100 first
Gas, and heat up according to preset degreasing heating curve, it vacuumizes simultaneously.With the temperature liter in effective heating area 112
Height, forming agent or bonding agent in blank to be sintered etc. are overflowed from blank to be sintered to form steam wax.The generation of steam wax
So that the air pressure in effective heating area 112 increases, when there is the air pressure in effective heating area 112 greater than the gas in the area Yi San 113
When pressure, it may appear that steam wax adverse current to the situation in the area Yi San 113, thus occur that steam is cured to be set on furnace tube 111, pollution
Furnace body.Therefore, it is necessary to which the air pressure in the area Yi San 113 is maintained to be greater than the air pressure in effective heating area 112.Specifically, detection, which is overflow, dissipates
The air pressure in area 113 and the air pressure for catching wax tank group 200, and according to the difference of the air pressure in the area Yi San 113 and the air pressure for catching wax tank group 200
The flow and/or adjusting for adjusting current-carrying gas catch the vacuum degree of wax tank group 200, so that the air pressure in the area Yi San 113 and catching wax tank
The difference of the air pressure of group 200 is maintained in setting pressure differential range.It can be caught by adjusting the valve size adjusting of vacuum pump group 300
The vacuum degree of wax tank group 200.
When the air pressure in the area Yi San 113 is excessive, that is, illustrate the long-range gas for crossing effective heating area 112 of the air pressure in the area Yi San 113
Pressure, the diffusion velocity in the area Yi San 113 in current-carrying gas is fast at this time, and current-carrying gas enters effective heating area 112 through thermal insulation layer 111
Afterwards, steam wax is driven quickly to be caught ceratuba road 114 into catching in wax tank group 200, at this time since the flow velocity of current-carrying gas crosses ambassador
The utilization rate for obtaining current-carrying gas reduces, and causes the waste of current-carrying gas, catches in requisition for the flow and reduction for reducing current-carrying gas
The vacuum degree of wax tank group 200.When the air pressure in the area Yi San 113 is too small, i.e. when the air pressure of effective heating area 112 is excessive, at this time may
It will appear that current-carrying gas cannot diffuse in effective heating area 112 or diffusion velocity is very slow, or even steam wax occur and diffuse to
The case where area Yi San 113, causes to dewax insufficient, catches wax tank group 200 in requisition for the flow and raising for increasing current-carrying gas
Vacuum degree.Therefore, the difference between the air pressure in the area Ying Jiangyisan 113 and the air pressure for catching wax tank group 200 is in zone of reasonableness.?
In the present embodiment, pressure differential range is set as 10K pa~30K pa.
Preferably, vacuum pump group 300 is Roots vacuum pump group 300, and pressure difference control device 400 includes first pressure detection dress
It sets and detects the air pressure in the area Yi San 113 with second pressure detection device, first pressure detection device, second pressure detection device is used for
The air pressure of wax tank group 200 is caught in detection.Further, first pressure detection device is electric contact pressure vacuum ga(u)ge, second pressure
Detection device is differential pressure transmitter.In addition, pressure difference control device 400 further includes controller, controller and first pressure detection are filled
It sets and is connected with second pressure detection device, and obtain the measured value of first pressure detection device and second pressure detection device, sentence
Both disconnected size of the difference, and the flow for controlling current-carrying gas makes first pressure detection dress with the vacuum degree for catching wax tank group 200
It sets and meets setting pressure differential range with the difference of the measured value of second pressure detection device.
Further, vacuum degreasing sintered system further includes transformer 600 and control cabinet 700, and transformer 600 is for stablizing
And the voltage of whole system is controlled, control cabinet 700 is used to control the operation of whole system, power on/off etc..Current-carrying gas is
It is one or more in inert gas, hydrogen or nitrogen.
It should be noted that steam wax refers to the organic substances such as forming agent and bonding agent in blank to be sintered at high temperature
Volatilize the gaseous material formed.Further, since effective heating area 112 with catch wax tank group 200 and be connected to by catching wax channel, therefore catch
Air pressure in wax tank is suitable with the air pressure of effective heating area 112.
4) high temperature sintering；
In the degreasing stage, blank to be sintered forming agent and bonding agent be condensate in the condensation caught in wax tank group 200
On stick.At this point, according to the sintering heating curve of setting, after the degreasing stage, with the heating rate 1100 of 5~20 DEG C/min
~1500 DEG C, keep the temperature 1~2 hour.Also, after terminating in the degreasing stage, stopping is passed through current-carrying gas, and is evacuated to certain
After negative pressure value, it is passed through the protective gas of preset flow, to prevent blank to be sintered to be oxidized.Protective gas can be nitrogen.
5) cooling.
Vacuum degreasing sintered system further includes cooling device 500, the inner wall of furnace tube 110, catch wax tank group 200 catch wax tank
Inner wall on be provided with coolant flow channel, coolant liquid is provided in coolant flow channel, coolant liquid is under the action of cooling device 500 in furnace
500 internal circulation flow of the inner wall of cylinder 110, the inner wall for catching wax tank and cooling device.After to the end of the high temperature sintering stage, to
It is sintered blank densified sintering product and forms shaping blank.Shaping blank is cooled down, to take out shaping blank.In a specific embodiment
In, it is cold with furnace after shaping blank molding, it is cooled down by cooling device 500.It in other embodiments, can also be in furnace tube
Gas circulation channel and heat exchanger are set on 110, by the gas extraction in furnace tube 110 and through leading to again after heat exchanger
Enter in furnace tube 110, to accelerate distributing for heat.
In the technical solution of the present embodiment, in the degreasing stage, the gas in effective heating area 112 includes current-carrying gas and steaming
Gas is cured, since the generation of steam wax is so that effective heating area 112 is caught the air pressure in wax tank group 200 and constantly changed, passes through control
The difference of the air pressure in the area Yi San 113 and effective heating area 112 in a certain range, enables to the steaming in effective heating area 112
Gas wax, which countercurrently can not catch ceratuba road 114 in the area Yi San 113 but directly mirror and enter, catches in wax tank group 200, compares existing skill
Art, steam wax collecting effect is more preferable, and further reduced steam wax and be set in probability on the inner wall of furnace tube, can effectively subtract
The small pollution to furnace body reduces the influence to blank sintering quality next time.
The specific embodiment of vacuum degreasing sintered forming method in the embodiment of the present invention is provided below.
Specific embodiment 1:
1) feeding: aluminum alloy blank to be sintered is put into the effective heating area 112 of vacuum degreasing fritting furnace 100:
2) it vacuumizes: to vacuum degreasing fritting furnace 100 and the progress vacuumize process of wax tank group 200 is caught, until pressure value is 6
Pa；
3) degreasing: being passed through inert gas into vacuum degreasing fritting furnace 100, according to the heating rate of 2 DEG C/min from room temperature
500 DEG C are heated to, and keeps the temperature 1 hour, is vacuumized simultaneously.It detects the air pressure in the area Yi San 113 and catches the air pressure of wax tank group 200, and
The flow and adjusting for adjusting inert gas catch the vacuum degree of wax tank group so that the air pressure in the area Yi San 113 and catching wax tank group 200
The difference of air pressure is maintained at 15 kPas, the steam wax generated in effective heating area 112 follow inert gas caught ceratuba road 114 into
Enter to catch in wax tank group 200；
4) high temperature sintering；
1300 DEG C are continuously heating to the heating rate of 5 DEG C/min, and keeps the temperature 1 hour.
5) cooling.
It cools to room temperature with the furnace, takes out aluminium alloy molded part.
Specific embodiment 2:
1) feeding: aluminium oxide blank to be sintered is put into the effective heating area 112 of vacuum degreasing fritting furnace 100:
2) it vacuumizes: to vacuum degreasing fritting furnace 100 and the progress vacuumize process of wax tank group 200 is caught, until pressure value is
10 pas；
3) degreasing: being passed through nitrogen gas into vacuum degreasing fritting furnace 100, according to the heating rate of 4 DEG C/min from room temperature
600 DEG C are heated to, and keeps the temperature 1.5 hours, is vacuumized simultaneously.It detects the air pressure in the area Yi San 113 and catches the air pressure of wax tank group 200,
And adjust nitrogen flow and adjusting catch wax tank group vacuum degree so that the air pressure in the area Yi San 113 with catch the gas of wax tank group 200
The difference of pressure is maintained at 20 kPas, and the steam wax generated in effective heating area 112 follows nitrogen to be caught the entrance of ceratuba road 114 and catches wax
In tank group 200；
4) high temperature sintering；
1450 DEG C are continuously heating to the heating rate of 10 DEG C/min, and keeps the temperature 2 hours.
5) cooling.
It cools to room temperature with the furnace, takes out aluminium oxide molded part.
Specific embodiment 3:
1) feeding: stainless steel blank to be sintered is put into the effective heating area 112 of vacuum degreasing fritting furnace 100:
2) it vacuumizes: to vacuum degreasing fritting furnace 100 and the progress vacuumize process of wax tank group 200 is caught, until pressure value is
15 pas；
3) degreasing: being passed through inert gas into vacuum degreasing fritting furnace 100, according to the heating rate of 2 DEG C/min from room temperature
500 DEG C are heated to, and keeps the temperature 1 hour, is vacuumized simultaneously, the air pressure in the area Yi San 113 is detected and catches the air pressure of wax tank group 200, and
The flow and adjusting for adjusting inert gas catch the vacuum degree of wax tank group so that the air pressure in the area Yi San 113 and catching wax tank group 200
The difference of air pressure is maintained at 25 kPas, and the steam wax generated in effective heating area 112 follows nitrogen to be caught the entrance of ceratuba road 114 and catches
In wax tank group 200；
4) high temperature sintering；
1200 DEG C are continuously heating to the heating rate of 15 DEG C/min, and keeps the temperature 1 hour.
5) cooling.
It cools to room temperature with the furnace, takes out stainless steel molded part.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all in the present invention
Inventive concept under, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/be used in it indirectly
He is included in scope of patent protection of the invention relevant technical field.
Claims (8)
1. a kind of vacuum degreasing sintered forming method, which is characterized in that implement the vacuum of the vacuum degreasing sintered forming method
Degreasing sintered system includes vacuum degreasing fritting furnace and catches wax tank group, and the vacuum degreasing fritting furnace includes furnace tube, is set to
Intracorporal enclosed by thermal insulation layer of the furnace tube sets the effective heating area formed, is formed by the inner wall of the thermal insulation layer and the furnace tube
The area Yi San and catch ceratuba road through the thermal insulation layer and the furnace tube, described in one end connection for catching ceratuba road
Effective heating area, it is described catch ceratuba road the other end connection described in catch wax tank group, the vacuum degreasing sintered forming method includes:
1) feeding: blank to be sintered is put into the effective heating area of the vacuum degreasing fritting furnace:
2) it vacuumizes: vacuumize process being carried out to the vacuum degreasing fritting furnace and the wax tank group of catching, until reaching setting pressure
Force value；
3) degreasing: being passed through current-carrying gas in Xiang Suoshu vacuum degreasing fritting furnace, heats up according to preset degreasing heating curve
And vacuumize, and detect the air pressure and the air pressure for catching wax tank group in the area Yi San, and according to the air pressure in the area Yi San with
The difference of the air pressure for catching wax tank group adjust the current-carrying gas flow and adjusting described in catch the vacuum degree of wax tank group so that
The difference of the air pressure and the air pressure for catching wax tank group that obtain the area Yi San is maintained in setting pressure differential range, effective heating
The steam wax generated in area is followed to catch described in the current-carrying gas warp described in the entrance of ceratuba road and be caught in wax tank group；
4) high temperature sintering；
5) cooling.
2. vacuum degreasing sintered forming method as described in claim 1, which is characterized in that described to overflow in the degreasing stage
The air pressure for dissipating area is greater than the air pressure for catching wax tank group, and the pressure differential range that sets is 10K pa~30K pa.
3. vacuum degreasing sintered forming method as claimed in claim 2, which is characterized in that the vacuum degreasing sintered system packet
Vacuum pump group is included, one end of the vacuum pump group is connected to the wax tank group of catching, and catches wax tank group to the furnace tube by described
Body carries out vacuumize process, and the other end of the vacuum pump group is connect with the furnace tube, and is passed through gas into the furnace tube
Body catches the vacuum degree of wax tank group by adjusting described in the valve size adjusting of the vacuum pump group.
4. vacuum degreasing sintered forming method as claimed any one in claims 1 to 3, which is characterized in that the degreasing liter
Warm curve are as follows: be heated to 500~600 DEG C from room temperature with the heating rate of 1~5 DEG C/min, and keep the temperature 1~2 hour.
5. vacuum degreasing sintered forming method as claimed any one in claims 1 to 3, which is characterized in that taken out very described
Empty stage, the setup pressure value are 5 pas~20 pas.
6. vacuum degreasing sintered forming method as claimed any one in claims 1 to 3, which is characterized in that in the high temperature
Sintering stage, after terminating in the degreasing stage, with 1100~1500 DEG C of heating rate of 5~20 DEG C/min, heat preservation 1~2
Hour.
7. vacuum degreasing sintered forming method as claimed in claim 6, which is characterized in that also wrapped in the high temperature sintering stage
It includes, after terminating in the degreasing stage, stopping is passed through current-carrying gas, and after being evacuated to target pressure value, is passed through default stream
The protective gas of amount.
8. vacuum degreasing sintered forming method as claimed any one in claims 1 to 3, which is characterized in that the current-carrying gas
Body is a kind of in inert gas, hydrogen or nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811641712.6A CN109530685B (en) | 2018-12-29 | 2018-12-29 | Vacuum degreasing sintering forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811641712.6A CN109530685B (en) | 2018-12-29 | 2018-12-29 | Vacuum degreasing sintering forming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109530685A true CN109530685A (en) | 2019-03-29 |
| CN109530685B CN109530685B (en) | 2021-01-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111451498A (en) * | 2020-02-28 | 2020-07-28 | 福建省长汀金龙稀土有限公司 | Degreasing method for powder metallurgy sintering |
| CN117232283A (en) * | 2023-11-15 | 2023-12-15 | 湘潭新大粉末冶金技术有限公司 | Automatic start-stop system of intelligent vacuum dewaxing sintering furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111451498A (en) * | 2020-02-28 | 2020-07-28 | 福建省长汀金龙稀土有限公司 | Degreasing method for powder metallurgy sintering |
| CN117232283A (en) * | 2023-11-15 | 2023-12-15 | 湘潭新大粉末冶金技术有限公司 | Automatic start-stop system of intelligent vacuum dewaxing sintering furnace |
| CN117232283B (en) * | 2023-11-15 | 2024-01-19 | 湘潭新大粉末冶金技术有限公司 | Automatic start-stop system of intelligent vacuum dewaxing sintering furnace |
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| CN109530685B (en) | 2021-01-15 |
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Effective date of registration: 20210129 Address after: 412000 workshop C-6, 9 Zhongda Road, Tianyuan District, Zhuzhou City, Hunan Province Patentee after: ZHUZHOU XINRONGLI INDUSTRY Co.,Ltd. Address before: 412000 R & D plant a, phase 2.1, Xinma power innovation park, 899 Xianyue Ring Road, Tianyuan District, Zhuzhou City, Hunan Province Patentee before: ZHUZHOU WANRONG NEW MATERIAL TECHNOLOGY Co.,Ltd. |