CN114322587B - Continuous sintering control method - Google Patents
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- CN114322587B CN114322587B CN202111623316.2A CN202111623316A CN114322587B CN 114322587 B CN114322587 B CN 114322587B CN 202111623316 A CN202111623316 A CN 202111623316A CN 114322587 B CN114322587 B CN 114322587B
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- 238000005245 sintering Methods 0.000 title claims abstract description 272
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 58
- 239000000463 material Substances 0.000 claims abstract description 45
- 230000001681 protective effect Effects 0.000 claims abstract description 38
- 238000009826 distribution Methods 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims description 106
- 238000004321 preservation Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 18
- 230000000630 rising effect Effects 0.000 claims description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 4
- 230000000977 initiatory effect Effects 0.000 claims description 4
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
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- 239000001307 helium Substances 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
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Abstract
The invention relates to a continuous sintering control method, wherein sintering control is carried out in a sintering furnace, the sintering furnace comprises a control system, a front gas replacement chamber, a sintering chamber, a rear gas replacement chamber and a material distribution transfer chamber, wherein the front gas replacement chamber, the sintering chamber, the rear gas replacement chamber and the material distribution transfer chamber are filled with protective gas and are sequentially sealed and connected, a door body is arranged between every two adjacent chambers, the opening degree of each door body is controlled by the control system, each chamber of the sintering furnace is effectively isolated, convection and diffusion are avoided between different heating sintering areas of the sintering furnace, the work piece to be sintered in the sintering furnace is prevented from being contacted with external pollutants in the sintering process, and meanwhile, the filling of the protective gas is effectively controlled by the control system, so that the environment and the temperature of the work piece to be sintered in the sintering process are effectively controlled. The continuous sintering is carried out in the atmosphere of the continuous shielding gas, so that the uniform atmosphere environment in the sintering chamber can be effectively maintained, the sintering quality of the workpiece is improved, the using amount of the atmosphere gas can be effectively reduced, and the temperature in the sintering chamber can be effectively regulated.
Description
Technical Field
The invention belongs to the technical field of powder metallurgy, and particularly relates to a continuous sintering control method.
Background
Related materials such as friction base materials, corrosion-resistant base materials, high-temperature-resistant base materials and the like are widely used in the fields of aviation, aerospace, ships, weapons, petrochemical industry, semiconductor devices and the like. The materials are mainly prepared by processing alloy matrixes, and the alloy matrixes are heterogeneous mixtures taking metal, nonmetal particles, whiskers or fibers as reinforcements, and have the advantages of low density, good electric conduction and thermal conductivity, high specific strength, high specific modulus, high temperature resistance, wear resistance, small thermal expansion coefficient, stable size and the like. The powder of the heterogeneous mixture is pressed into a green body and then conveyed to a sintering furnace for sintering. Sintering is one of the commonly used heat treatment processes, and can be performed continuously or basically continuously in a short time, so that a large number of green bodies needing sintering can be completed; because the inlet side and the outlet side of a traditional sintering furnace are open, and isolation of different areas of the sintering furnace is lacking, pollutants inside or outside the sintering furnace can pass through the openings, so that the environment and the temperature of a green body in the sintering production process in the sintering furnace are difficult to control, convection and/or diffusion are formed between different heating sintering areas of the sintering furnace, the surface of the green body reacts with the pollutants, the consistency of material performance is affected, the sintering strength is poor, and the yield and the utilization coefficient are also reduced.
Disclosure of Invention
The invention aims to provide a continuous sintering control method, which is used for continuously sintering in a continuous atmosphere, so that the consistent atmosphere environment in a sintering furnace can be maintained, the sintering quality of a workpiece can be improved, and the temperature in the sintering furnace can be effectively regulated. In order to achieve the above purpose, the present invention adopts the following technical scheme:
according to one aspect of the invention, there is provided a continuous sintering control method, which is performed in a sintering furnace, the sintering furnace comprising a control system and a front gas replacement chamber, a sintering chamber, a rear gas replacement chamber and a material distribution transfer chamber which are filled with a protective gas and are sequentially sealed and connected, wherein a door body is arranged between every two adjacent chambers, and the control system is respectively and electrically connected with each door body so as to control the opening degree of each door body; the continuous sintering control method comprises the following steps:
providing a workpiece to be sintered and a material tray, and loading the workpiece to be sintered into the material tray to obtain the material tray loaded with the workpiece to be sintered;
after the control system controls the door body between the front gas replacement chamber and the sintering chamber to be closed, the tray loaded with the workpiece to be sintered is sent to the front gas replacement chamber, and protective gas is continuously filled in the tray to remove the air physically adsorbed on the workpiece to be sintered and the tray;
the control system controls the door body between the front gas replacement chamber and the sintering chamber to be opened, and the work piece to be sintered, with the air removed, and the work piece to be sintered and the material tray are sent to the sintering chamber to be subjected to low-temperature initial sintering, temperature rising sintering and heat preservation sintering in sequence, so that the material tray loaded with the sintering work piece is obtained;
the control system controls a door body between the sintering chamber and the rear gas replacement chamber to be opened, and the tray loaded with the sintering workpiece is sent to the rear gas replacement chamber for cooling;
and the control system controls a door body between the rear gas replacement chamber and the material distribution transfer chamber to be opened, the cooled sintered workpieces and the material trays are conveyed to the material distribution transfer chamber for separation, the separated sintered workpieces are conveyed to the next working procedure, and the separated material trays are conveyed to the loading position of the workpieces to be sintered for recycling.
In the above scheme, the oxygen content of the front gas replacement chamber, the sintering chamber, the material distribution transfer chamber and the rear gas replacement chamber filled with the protective gas is less than or equal to 0.5 percent.
The above scheme is further preferable, the door body between the front gas replacement chamber and the sintering chamber is opened to form the feed inlet of the sintering chamber, the door body between the sintering chamber and the rear gas replacement chamber is opened to form the discharge outlet of the sintering chamber, the top of the sintering chamber close to the feed inlet is provided with a protective gas inlet, the sintering chamber is also provided with a protective gas conveying pipe, the protective gas conveying pipe vertically stretches into the sintering chamber downwards along the protective gas inlet and extends to the discharge outlet along the conveying direction of the workpiece to be sintered in the sintering chamber, the protective gas conveying pipe is provided with a plurality of air spraying valves, and the control system is electrically connected with the air spraying valves and is used for controlling the opening and closing of the air spraying valves according to the oxygen content and the temperature feedback in the sintering chamber.
According to the scheme, the sintering chamber is further preferably provided with a plurality of sections of heating sintering areas, at least one section of controllable cooling area and a plurality of sections of heat preservation sintering areas for controlling the tapping temperature of the sintered workpiece along the conveying direction of the workpiece to be sintered, the heating sintering areas, the controllable cooling areas and the heat preservation sintering areas are respectively provided with thermocouples, the bottom of each section of heating sintering area is further provided with an exhaust port, and the control system is electrically connected with the thermocouples and is used for controlling the opening and closing of the thermocouples according to the temperature feedback of each area.
The above scheme is further preferable, the low-temperature initial sintering and the temperature-rising sintering are performed in the heating sintering zone, and the specific steps include:
controlling the temperature of the first section heating sintering zone to be 200-300 ℃, and then heating each section heating sintering zone to be 30-60 ℃ until the temperature of the last section heating sintering zone is 900-1450 ℃;
and (3) feeding the workpiece to be sintered, from which the air is removed, into the first-stage heating sintering zone for low-temperature initial sintering for 15-20 min, and then feeding the workpiece to be sintered into the next-stage heating sintering zone for temperature rising sintering until the temperature rising sintering in the final-stage heating sintering zone is completed, wherein the time of each stage of temperature rising sintering is 30-60 min.
The above scheme is further preferable, the process control of the low-temperature initial sintering and the temperature-rising sintering comprises the following steps:
step S61: determining the sintering initial temperature T of each section of heating sintering zone 0 And sintering end temperature T n Acquiring the real-time sintering temperature T of the current heating sintering zone 1 Judging the real-time sintering temperature T 1 And sintering initiation temperature T 0 And sintering end temperature T n Is a relationship of (2);
step S62:according to the real-time sintering temperature T 1 Acquiring the pressure value variation delta P and the gas inflow Q of the shielding gas fed into the sintering chamber i The pressure value variation delta P is the pressure difference between the protective gas inlet and the current heating sintering zone exhaust port;
step S63: calculating and adjusting the gas inflow and gas discharge Q of the current heating sintering zone according to the pressure value variation delta P O 。
In the above scheme, the cooling and sintering time is preferably 20-30 min.
In the above embodiment, the temperature of the post gas substitution chamber is preferably 120 to 200 ℃.
The above scheme is further preferable, wherein the shielding gas is nitrogen, argon or helium.
The above scheme is further preferable, the heat preservation sintering is performed while extrusion molding is performed, the pressure of the extrusion molding is 50 MPa-70 MPa, and the time is 5 min-10 min.
In summary, the invention adopts the technical scheme, and has the following technical effects:
according to the invention, the opening degree of each door body is controlled by the control system, each chamber of the sintering furnace is effectively isolated, convection and diffusion between different heating sintering areas of the sintering furnace are avoided, the workpiece to be sintered in the sintering furnace is ensured not to be in contact with external pollutants in the sintering process, and meanwhile, the filling of the protective gas is effectively controlled by the control system, so that the environment and the temperature of the workpiece to be sintered in the sintering process are effectively controlled. The continuous sintering is carried out in the atmosphere of the continuous shielding gas, so that the uniform atmosphere environment in the sintering chamber can be effectively maintained, the sintering quality of the workpiece is improved, the using amount of the atmosphere gas can be effectively reduced, and the temperature in the sintering chamber can be effectively regulated.
Drawings
FIG. 1 is a schematic view of a sintering furnace according to the present invention;
in the drawing, a front gas replacement chamber 1, a sintering chamber 2, a rear gas replacement chamber 3, a material distribution transfer chamber 4, a protective gas inlet 10a, a first door 12, a fourth door 11, a second door 23, a third door 34, a fifth door 41, a sixth door 42, a workpiece to be sintered 100, a tray 101, a heating sintering area 201, a controllable cooling area 202, a thermal insulation sintering area 203
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below by referring to the accompanying drawings and by illustrating preferred embodiments. It should be noted, however, that many of the details set forth in the description are merely provided to provide a thorough understanding of one or more aspects of the invention, and that these aspects of the invention may be practiced without these specific details.
As shown in fig. 1, a continuous sintering control method is performed in a sintering furnace, the sintering furnace comprises a control system (not shown) and a front gas replacement chamber 1, a sintering chamber 2, a rear gas replacement chamber 3 and a material distribution transfer chamber 4 which are filled with protective gas and are sequentially sealed and connected, door bodies are arranged between every two adjacent chambers, and the control system is respectively and electrically connected with each door body so as to control the opening degree of each door body. The door body between the front gas replacement chamber 1 and the sintering chamber 2 is opened to form a feed inlet, and the door body between the sintering chamber 2 and the rear gas replacement chamber 3 is opened to form a discharge outlet.
In the invention, before continuous sintering, a workpiece 100 to be sintered and a tray 101 are provided, the workpiece 100 to be sintered is loaded in the tray 101, after a control system controls a door body between a front gas replacement chamber 1 and a sintering chamber 2 to be closed, the workpiece 100 to be sintered and the tray 101 are conveyed to the front gas replacement chamber 1, protective gas is continuously filled into the front gas replacement chamber 1 to remove air physically adsorbed on the workpiece 100 to be sintered and the tray 101, the control system controls the door body between the front gas replacement chamber 1 and the sintering chamber 2 to be opened, the workpiece 100 to be sintered and the tray 101 to be conveyed to the sintering chamber 2 after the removal of the air are sequentially subjected to low-temperature initial sintering, temperature rising sintering and heat preservation sintering, the tray loaded with the workpiece to be sintered is obtained, the control system controls the door body between the sintering chamber 2 and a rear gas replacement chamber 3 to be opened, the tray loaded with the workpiece to be sintered is conveyed to the rear gas replacement chamber 3 to be cooled, the control system controls the door body between the rear gas replacement chamber 3 and a branch transfer chamber 4 to be opened, the cooled workpiece to be conveyed to the branch transfer chamber 4 to be separated, and the workpiece to be conveyed to the next separated workpiece to be conveyed to the position for recycling sintering.
In the invention, as shown in fig. 1, the door bodies arranged between adjacent chambers respectively comprise a first door body 12, a second door body 23, a third door body 34, a fourth door body 11, a fifth door body 41 and a sixth door body 42, the specific positions of the door bodies which can be adjusted in opening degree are as follows, the door bodies between the front gas replacement chamber 1 and the sintering chamber 2 are the first door body 12, the door bodies between the sintering chamber 2 and the rear gas replacement chamber 3 are the second door body 23, the door bodies between the rear gas replacement chamber 3 and the material distribution transfer chamber 4 are the third door body 34, in addition, the fourth door body 11 is arranged at the inlet of the front gas replacement chamber 1, and the fifth door body 41 and the sixth door body 42 are also arranged at the outlet of the material distribution transfer chamber 4.
The control system controls each door body to rotate and open along the conveying direction of the workpiece to be sintered, so that the tray loaded with the workpiece to be sintered is conveyed to the next sintering process, and controls the opening degree of each door body through the temperature of each region in the sintering chamber and the content of oxygen in each chamber fed back in real time, so that the loss of the temperature in the sintering chamber and the drift range of protective gas are reduced while the tray loaded with the workpiece to be sintered is ensured to be conveyed smoothly between the chambers, and the problem that the workpiece to be sintered is oxidized due to low purity of the protective gas in the sintering process is solved, and the sintering quality is ensured.
In the invention, a protective gas inlet 10a is arranged at the top end of a sintering chamber 2 close to a feed inlet, a protective gas conveying pipe (not shown) is further arranged in the sintering chamber 2, the protective gas conveying pipe vertically extends downwards into the sintering chamber 2 along the protective gas inlet 10a and extends to a discharge outlet along the conveying direction of a workpiece to be sintered in the sintering chamber, a plurality of air injection valves are arranged on the protective gas conveying pipe and are electrically connected with a control system, and the air injection valves are used for controlling the opening and closing of the air injection valves according to the oxygen content and the temperature feedback in the sintering chamber 2.
In the invention, the front gas replacement chamber 1 and the rear gas replacement chamber 3 are respectively filled with the protective gas, so that the air outside the furnace can be effectively prevented from being mixed into the sintering chamber, the uniform atmosphere environment in the sintering chamber 2 can be maintained, the sintering quality of the workpiece can be improved, and the subsequent treatment is convenient.
In the continuous sintering process, the work piece 100 to be sintered, from which air is removed, is conveyed to the sintering chamber 2 together with the material tray 101 to sequentially perform low-temperature initial sintering, temperature rising sintering and heat preservation sintering, the low-temperature initial sintering enables the release agent in the work piece to be sintered to gradually escape along with the temperature rising, the temperature rising sintering enables the work piece to be sintered to enter a deoxidization presintering and sintering densification stage, argon or nitrogen protective gas with the pressure of 5MPa is introduced into a furnace at the later stage of the sintering stage, and heat preservation sintering is performed for a period of time, so that defects such as pores and cracks of the work piece can be eliminated, after the heat preservation sintering is finished, the work piece is conveyed to the rear gas replacement chamber 3 to be cooled to 120-200 ℃, and then conveyed to the material distribution transfer chamber 4 to be separated, and continuous sintering is completed.
In the invention, the control system executes the opening degree of the door body corresponding to the outlet side according to the heat preservation sintering temperature in the heat preservation sintering zone, the content of the protective gas filled in the front gas replacement chamber 1, the rear gas replacement chamber 3 and the material distribution transfer chamber 4, and can effectively maintain the atmosphere environment with consistent protective gas of the front gas replacement chamber, the sintering chamber, the rear gas replacement chamber and the material distribution transfer chamber, thereby ensuring the sintering quality.
In the invention, a plurality of sections of heating sintering areas 201, at least one section of controllable cooling area 202 and a plurality of sections of heat preservation sintering areas 203 for controlling the tapping temperature of the sintered workpiece are respectively arranged in the sintering chamber 2 along the conveying direction of the workpiece to be sintered, thermocouples (not shown) are respectively arranged in the heating sintering areas 201, the controllable cooling areas 202 and the heat preservation sintering areas 203, wherein the bottom of each section of heating sintering area is also provided with an exhaust port, and a control system is electrically connected with the thermocouples and is used for controlling the opening and the closing of the thermocouples according to the temperature feedback of each area.
In the present invention, the above-mentioned low-temperature initial sintering and temperature-rising sintering are performed in the heated sintering zone 201, and specific steps include: controlling the temperature of the first section heating sintering zone to be 200-300 ℃, and then heating each section heating sintering zone to be 30-60 ℃ until the temperature of the last section heating sintering zone is 900-1450 ℃; and then sending the work piece to be sintered, which is deprived of air, together with the material tray into a first-stage heating sintering zone for low-temperature initial sintering for 15-20 min, and then sending the work piece to be sintered into a next-stage heating sintering zone for heating sintering until the heating sintering in the final-stage heating sintering zone is completed, wherein the time of each stage of heating sintering is 30-60 min.
Wherein, the process control of the low-temperature initial sintering and the temperature-rising sintering comprises the following steps:
step S61: determining the sintering initial temperature T of each section of heating sintering zone 0 And sintering end temperature T n Acquiring the real-time sintering temperature T of the current heating sintering zone 1 Judging the real-time sintering temperature T 1 And T is 0 、T n Is a relationship of (2); wherein, the sintering initiation temperature T 0 At 200-300 deg.c and at real-time sintering temperature T 1 < sintering initiation temperature T 0 When the temperature T is the real-time sintering temperature T, the control system controls the thermocouple to continuously heat the current heating sintering zone 1 Not less than sintering end temperature T n And when the sintering zone is heated currently, the control system controls the air injection valve to open so as to charge the protective gas into the sintering zone.
Step S62: according to the real-time sintering temperature T 1 Acquiring a pressure value variation delta P (which is the pressure difference between a protective gas inlet and an exhaust port of a sintering zone which is currently heated) and a gas inflow Q of protective gas fed into a sintering chamber i 。
Step S63: according to the pressure value variation delta P, calculating and adjusting the gas inflow and gas discharge Q of the current heating sintering zone O The current heating section is cooled by adjusting the discharge amount of the shielding gas of the current heating section through the bottom exhaust port of the heating sintering zone 201, and for this purpose, the pressure change of the current heating sintering zone 201 and the gas inflow amount Q are obtained through the change of the current heating temperature i Thereby the gas is discharged from the sintering chamber to achieve the purpose of adjusting the internal temperature.
In the invention, after the temperature rising sintering of the workpiece to be sintered carried by the material tray is completed, the workpiece to be sintered is firstly sent into a controllable cooling area 202 for cooling sintering for 20-30 min, then is cooled in a post gas replacement chamber 3 at 120-200 ℃, and finally is separated in a material separation transfer chamber 4. The top of the controllable cooling zone 202 is provided with an upper exhaust port for exhaust cooling adjustment, the top of the heat preservation sintering zone 203, which is close to the discharge end, is provided with an air inlet pipe for carrying out air charging temperature adjustment and adjusting oxygen content and internal pressure on the heat preservation sintering zone, the controllable cooling zone 202 and the three-section heat preservation sintering zone 203 are used for controlling the discharging temperature of sintered workpieces, the sintering discharging temperature is too high, cooling is carried out in the controllable cooling zone, the temperature is continuously increased in the three-section heat preservation sintering zone 203 when the temperature is too low for controlling the controllable cooling zone 202, the sintered workpieces enter the material distribution transfer chamber 4 together with a material tray, and the oxygen content in the material distribution transfer chamber 4 is less than or equal to 0.2%.
According to the invention, through continuous heating sintering, the temperature deviation in the sintering chamber is reduced, the uniformity of the sintering temperature is ensured, the performance and consistency of the sintered workpiece are improved, and the productivity can be improved.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (5)
1. A continuous sintering control method, characterized in that: the continuous sintering control method is carried out in a sintering furnace, the sintering furnace comprises a control system, a front gas replacement chamber, a sintering chamber, a rear gas replacement chamber and a material distribution transfer chamber, wherein the front gas replacement chamber, the sintering chamber, the rear gas replacement chamber and the material distribution transfer chamber are filled with protective gas and are sequentially sealed and connected, a door body is arranged between every two adjacent chambers, and the control system is respectively and electrically connected with each door body so as to control the opening degree of each door body; the continuous sintering control method comprises the following steps:
providing a workpiece to be sintered and a material tray, and loading the workpiece to be sintered into the material tray to obtain the material tray loaded with the workpiece to be sintered;
after the control system controls the door body between the front gas replacement chamber and the sintering chamber to be closed, the tray loaded with the workpiece to be sintered is sent to the front gas replacement chamber, and protective gas is continuously filled in the tray to remove the air physically adsorbed on the workpiece to be sintered and the tray;
the control system controls the door body between the front gas replacement chamber and the sintering chamber to be opened, and the work piece to be sintered, with the air removed, and the work piece to be sintered and the material tray are sent to the sintering chamber to be subjected to low-temperature initial sintering, temperature rising sintering and heat preservation sintering in sequence, so that the material tray loaded with the sintering work piece is obtained;
the control system controls a door body between the sintering chamber and the rear gas replacement chamber to be opened, and the tray loaded with the sintering workpiece is sent to the rear gas replacement chamber for cooling;
the control system controls a door body between the rear gas replacement chamber and the material distribution transfer chamber to be opened, the cooled sintered workpieces and the material trays are sent to the material distribution transfer chamber for separation, the separated sintered workpieces are sent to the next working procedure, and the separated material trays are sent to the loading position of the workpieces to be sintered for recycling;
the door body between the front gas replacement chamber and the sintering chamber is opened to form a feed port of the sintering chamber, the door body between the sintering chamber and the rear gas replacement chamber is opened to form a discharge port of the sintering chamber, a protective gas inlet is formed in the top of the sintering chamber, which is close to the feed port, a protective gas conveying pipe is further arranged in the sintering chamber, and extends into the sintering chamber vertically downwards along the protective gas inlet and extends to the discharge port along the conveying direction of the workpiece to be sintered in the sintering chamber, a plurality of air injection valves are arranged on the protective gas conveying pipe, and the control system is electrically connected with the air injection valves and is used for controlling the opening and the closing of the air injection valves according to the oxygen content and the temperature feedback in the sintering chamber;
the sintering chamber is internally provided with a plurality of sections of heating sintering areas, at least one section of controllable cooling area and a plurality of sections of heat preservation sintering areas for controlling the tapping temperature of the sintering workpiece along the conveying direction of the workpiece to be sintered, the heating sintering areas, the controllable cooling areas and the heat preservation sintering areas are respectively provided with thermocouples, the bottom of each section of heating sintering area is also provided with an exhaust port, and the control system is electrically connected with the thermocouples and is used for controlling the opening and closing of the thermocouples according to the temperature feedback of each area;
the low-temperature initial sintering and the temperature-rising sintering are carried out in the heating sintering area, and the specific steps comprise:
controlling the temperature of the first section heating sintering zone to be 200-300 ℃, and then heating each section heating sintering zone to be 30-60 ℃ until the temperature of the last section heating sintering zone is 900-1450 ℃;
sending the work piece to be sintered, from which air is removed, into the first-stage heating sintering zone for low-temperature initial sintering for 15-20 min, and then sending the work piece to be sintered into the next-stage heating sintering zone for temperature rising sintering until the temperature rising sintering in the final-stage heating sintering zone is completed, wherein the time of each stage of temperature rising sintering is 30-60 min; the process control of the low-temperature initial sintering and the temperature-rising sintering comprises the following steps:
step S61: determining the sintering initial temperature T of each section of heating sintering zone 0 And sintering end temperature T n Acquiring the real-time sintering temperature T of the current heating sintering zone 1 Judging the real-time sintering temperature T 1 And sintering initiation temperature T 0 And sintering end temperature T n Is a relationship of (2);
step S62: according to the real-time sintering temperature T 1 Acquiring the pressure value variation delta P and the gas inflow Q of the shielding gas fed into the sintering chamber i The pressure value variation delta P is the pressure difference between the protective gas inlet and the current heating sintering zone exhaust port;
step S63: calculating and adjusting the gas inflow and gas discharge Q of the current heating sintering zone according to the pressure value variation delta P O 。
2. A continuous sintering control method according to claim 1, characterized in that: the oxygen content of the front gas replacement chamber, the sintering chamber, the material distribution transfer chamber and the rear gas replacement chamber filled with the protective gas is less than or equal to 0.5 percent.
3. The continuous sintering control method according to claim 1, wherein the temperature of the post gas substitution chamber is 120 ℃ to 200 ℃.
4. A continuous sintering control method according to any one of claims 1 to 3, characterized in that: the protective gas is nitrogen, argon or helium.
5. A continuous sintering control method according to claim 1, characterized in that: and (3) carrying out extrusion molding while carrying out heat preservation sintering, wherein the extrusion molding pressure is 50-70 MPa, and the time is 5-10 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111623316.2A CN114322587B (en) | 2021-12-28 | 2021-12-28 | Continuous sintering control method |
Applications Claiming Priority (1)
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| CN101965495A (en) * | 2008-01-05 | 2011-02-02 | Fl史密斯公司 | Apparatus and method for cooling kiln exhaust gases in a kiln bypass |
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