CN117146580A - Eight-chamber vacuum continuous sintering furnace control method and eight-chamber vacuum continuous sintering furnace - Google Patents
Eight-chamber vacuum continuous sintering furnace control method and eight-chamber vacuum continuous sintering furnace Download PDFInfo
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- CN117146580A CN117146580A CN202311432660.2A CN202311432660A CN117146580A CN 117146580 A CN117146580 A CN 117146580A CN 202311432660 A CN202311432660 A CN 202311432660A CN 117146580 A CN117146580 A CN 117146580A
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- 238000005245 sintering Methods 0.000 title claims abstract description 175
- 238000000034 method Methods 0.000 title claims abstract description 69
- 239000000463 material Substances 0.000 claims description 104
- 238000002360 preparation method Methods 0.000 claims description 86
- 238000005086 pumping Methods 0.000 claims description 57
- 238000010438 heat treatment Methods 0.000 claims description 36
- 238000007872 degassing Methods 0.000 claims description 32
- 238000001816 cooling Methods 0.000 claims description 31
- 239000012535 impurity Substances 0.000 claims description 17
- 239000001993 wax Substances 0.000 claims description 17
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 239000012188 paraffin wax Substances 0.000 claims description 8
- 238000012546 transfer Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 2
- 238000004018 waxing Methods 0.000 claims description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical group [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- -1 electricity Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
- F27B5/18—Arrangement of controlling, monitoring, alarm or like devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/04—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated adapted for treating the charge in vacuum or special atmosphere
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/04—Sintering
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Powder Metallurgy (AREA)
Abstract
The application provides a control method of an eight-chamber vacuum continuous sintering furnace and the eight-chamber vacuum continuous sintering furnace, which belong to the technical field of vacuum continuous atmosphere sintering furnaces.
Description
Technical Field
The application belongs to the technical field of vacuum continuous atmosphere sintering furnaces, and particularly relates to a control method of an eight-chamber vacuum continuous sintering furnace and the eight-chamber vacuum continuous sintering furnace.
Background
The product performance can be greatly improved by atmosphere sintering, and different sintering atmospheres are required to be introduced into different materials in the sintering process, so that the product densification degree is improved, and the product with good performance is obtained. However, the process control of atmosphere sintering is complicated, the adaptability is poor, the product difference caused by different personnel and different machine types is large, the automatic production of various products is difficult to finish, and the product performance is affected.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art or related art.
Therefore, the application provides a control method of an eight-chamber vacuum continuous sintering furnace, which comprises the following steps:
the method comprises the steps of enabling the interior of a preparation chamber to be at standard atmospheric pressure, opening a first gate valve, conveying materials to the preparation chamber, closing the first gate valve, vacuumizing the preparation chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the preparation chamber, and preheating the materials at a first preset temperature;
vacuumizing the preparation chamber, opening a second gate valve, conveying the material to the dewaxing chamber, closing the second gate valve, vacuumizing the dewaxing chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the dewaxing chamber, and heating the material at a second preset temperature;
vacuumizing the dewaxing chamber, opening a third gate valve, conveying the material to the first degassing chamber, closing the third gate valve, vacuumizing the first degassing chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the first degassing chamber, and heating the material at a third preset temperature;
vacuumizing the first degassing chamber, opening a fourth gate valve, conveying the material to the second degassing chamber, closing the fourth gate valve, vacuumizing the second degassing chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the second degassing chamber, and heating the material at a fourth preset temperature;
vacuumizing the second degassing chamber, vacuumizing the first sintering chamber, opening a fifth gate valve, conveying the material to the first sintering chamber, closing the fifth gate valve, vacuumizing the first sintering chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the first sintering chamber, and heating the material at a fifth preset temperature;
vacuumizing the first sintering chamber, vacuumizing the second sintering chamber, opening a sixth gate valve, conveying the material to the second sintering chamber, closing the sixth gate valve, vacuumizing the second sintering chamber, selecting a proper atmosphere introducing valve according to the sintering process, introducing sintering atmosphere into the second sintering chamber, and heating the material at a sixth preset temperature;
vacuumizing the second sintering chamber, vacuumizing the third sintering chamber, opening a seventh gate valve, conveying the material to the third sintering chamber, closing the seventh gate valve, vacuumizing the third sintering chamber, selecting a proper atmosphere introducing valve according to the sintering process, introducing sintering atmosphere into the third sintering chamber, and heating the material at a seventh preset temperature;
vacuumizing the third sintering chamber, vacuumizing the cooling chamber, opening an eighth gate valve, conveying the material to the cooling chamber, closing the eighth gate valve, selecting a proper atmosphere introducing valve according to the sintering process, introducing cooling atmosphere into the cooling chamber, and cooling the material;
and vacuumizing the cooling chamber to make the cooling chamber in an atmospheric state, opening a ninth gate valve, and taking out the materials.
In addition, the eight-chamber vacuum continuous sintering furnace control method in the technical scheme provided by the application can also have the following additional technical characteristics:
in one possible implementation mode, a first temperature zone, a second temperature zone and a third temperature zone are arranged in the dewaxing chamber, and meanwhile, heating devices in the first temperature zone, the second temperature zone and the third temperature zone are started to heat materials in the dewaxing chamber in a partitioning mode, so that the dewaxing chamber is heated uniformly and reaches a first preset temperature.
In one possible implementation, the preparation chamber is set to be at standard atmospheric pressure, the first gate valve is opened to transfer the material to the preparation chamber, the first gate valve is closed to vacuumize the preparation chamber, a proper atmosphere introducing valve is selected according to the sintering process to introduce sintering atmosphere into the preparation chamber, and after preheating the material at a first preset temperature, the method further comprises: after preheating the material for a first preset period of time, the preparation chamber is subjected to wax removal, and a second preset period of time is maintained.
In one possible embodiment, the preparation chamber includes a dewaxing system, the preparation chamber is set to a standard atmospheric pressure, the first gate valve is opened to transfer the material to the preparation chamber, the first gate valve is closed to vacuumize the preparation chamber, a proper atmosphere introduction valve is selected according to the sintering process to introduce a sintering atmosphere into the preparation chamber, and preheating the material at a first preset temperature includes:
confirming that the preparation room is free of materials;
confirming that the slide valve pump, the Roots pump, the rough pumping valves, the first gate valve and the second gate valve are in a closed state;
opening a first vacuum breaking valve to enable the interior of the preparation chamber to be at standard atmospheric pressure, opening a first gate valve to convey materials to the preparation chamber, and closing the first gate valve;
opening a slide valve pump, a first rough pumping valve and a second rough pumping valve, and pumping air to the preparation chamber to enable the preparation chamber to be in vacuum;
heating the preparation chamber and the dewaxing pipe heating wire to a first preset temperature, maintaining the first preset temperature, and discharging impurities into the dewaxing tank;
opening a third rough pumping valve, closing the first rough pumping valve, opening an atmosphere introducing valve and maintaining a first preset time period;
after a first preset time period, stopping heating the preparation chamber and the dewaxing pipe heating wire;
and closing the third rough pumping valve and the atmosphere introducing valve, opening the first rough pumping valve, and pumping the preparation chamber to vacuum the preparation chamber.
In one possible embodiment, de-waxing the preparation chamber and maintaining the second preset time period comprises:
confirming that no material exists in the preparation room;
closing the first rough pumping valve, the second rough pumping valve and the third rough pumping valve, and opening the fourth rough pumping valve to pump air out of the wax removing tank so as to enable the wax removing tank to be in vacuum;
closing the fourth rough pumping valve, opening the fifth rough pumping valve, discharging impurities in the dewaxing tank into the dewaxing tank, and maintaining the second preset time period;
after the second preset time period, closing a fifth rough pumping valve, opening a second vacuum breaking valve, and exhausting the paraffin removal tank to enable the inside of the paraffin removal tank to be at standard atmospheric pressure;
opening a sixth rough pumping valve to discharge impurities from the paraffin removal tank;
closing the sixth rough pumping valve and the second vacuum breaking valve, opening the fourth rough pumping valve, and pumping air to the wax removing tank to enable the wax removing tank to be in vacuum;
and closing the fourth rough pumping valve, opening the first rough pumping valve and the second rough pumping valve, and pumping the preparation chamber to enable the preparation chamber to be in vacuum.
In one possible embodiment, the first preset temperature is less than 200 ℃, the first preset time period is 120 minutes, and the second preset time period is 5 minutes.
In one possible embodiment, the preparation chamber, the dewaxing chamber, the first degassing chamber, the second degassing chamber, the first sintering chamber, the second sintering chamber and the third sintering chamber are all communicated with a corresponding atmosphere regulating system, and a rough pumping valve and at least three atmosphere introducing valves are arranged in the atmosphere regulating system to regulate the components and the pressure of the sintering atmosphere in the chamber.
In one possible embodiment, adjusting the composition and pressure of the sintering atmosphere within the chamber comprises: firstly, the rough drawing valve is opened to exhaust the chamber, after the chamber is in a vacuum state, the atmosphere introducing valve is opened, sintering atmosphere is introduced into the chamber, and meanwhile, the rough drawing valve and the atmosphere introducing valve are regulated to carry out partial pressure so as to carry out different partial pressure atmosphere sintering on materials in the chamber.
In one possible embodiment, the second preset temperature is 500 ℃, the third preset temperature is 800 ℃, the fourth preset temperature is 800 ℃, the fifth preset temperature is 1050 ℃, the sixth preset temperature is 1050 ℃, and the seventh preset temperature is 1050 ℃.
In another aspect of the application, an eight-chamber vacuum continuous sintering furnace is provided, comprising the eight-chamber vacuum continuous sintering furnace control method.
The eight-chamber vacuum continuous sintering furnace control method and the eight-chamber vacuum continuous sintering furnace have the beneficial effects that compared with the prior art:
through carrying out pretreatment, dewaxing, twice degasification, three times sintering and cooling treatment to the material in succession, and when handling the material, through opening corresponding atmosphere introduction valve according to sintering technology is nimble, lets in suitable sintering atmosphere in the cavity fast, can accomplish the continuous production of multiple goods according to the technological setting, can satisfy the different sintering technology of different goods, reduce the goods difference that different personnel and different models brought, improve the production quality and the goods uniformity of goods.
Before the material gets into the dewaxing room, carry out preheating to the material, carry out preliminary dewaxing to the material, make additive and other impurity that the interior fusing point of material is low, carry to the dewaxing jar in along with the going on of third rough suction valve evacuation to store to make the dewaxing room can dewax completely, improve the product quality of follow-up sintering.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a flow chart of a method for controlling an eight-chamber vacuum continuous sintering furnace according to an embodiment of the present application;
FIG. 2 is a flowchart of step S102 in FIG. 1;
FIG. 3 is a schematic diagram of the operation of a preparation chamber according to an alternative embodiment of the application;
wherein, the correspondence between the reference numerals and the component names in fig. 1 to 3 is:
13. a dewaxing chamber; 14. a slide valve pump; 15. roots pump; 16. a first vacuum break valve; 17. a first rough pumping valve; 18. a second rough pumping valve; 19. a third rough pumping valve; 20. an atmosphere introduction valve; 21. a fourth rough pumping valve; 22. a fifth rough pumping valve; 23. a dewaxing tank; 24. a wax removing tank; 25. a second vacuum break valve; 26. and a sixth rough pumping valve.
Detailed Description
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
The preferred embodiments of the present application will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present application only, and are not intended to limit the present application.
Referring to fig. 1 in combination, according to an embodiment of the present application, a method for controlling an eight-chamber vacuum continuous sintering furnace includes:
step S101: the method comprises the steps of enabling the interior of a preparation chamber to be at standard atmospheric pressure, opening a first gate valve, conveying materials to the preparation chamber, closing the first gate valve, vacuumizing the preparation chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the preparation chamber, and preheating the materials at a first preset temperature.
In this step, the vacuum break valve is opened to bring the interior of the preparation chamber to a normal atmospheric state.
Before the step, whether public configurations such as water, electricity, gas and the like meet production requirements or not needs to be checked, valves, motors, transmission points and the like are at initial positions, then valves and pumps of the chambers are started, preliminary vacuumizing and oxygen discharge are carried out, and the vacuum degree, the pressure rise rate and the like are ensured to meet the production requirements. The material is then placed on an insertion side trolley and transported into each chamber by means of a motor roller.
Step S102: vacuumizing the preparation chamber, opening a second gate valve, conveying the material to the dewaxing chamber, closing the second gate valve, vacuumizing the dewaxing chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the dewaxing chamber, and heating the material at a second preset temperature.
In the step, when the product is heated at a second preset temperature, the product is in a physical deflation stage, so that oil impurities such as wax and grease in the product can be removed.
In a specific application, the dewaxing chamber is generally heated to 500-600 ℃, the heating temperature of the piping of the dewaxing chamber is 180 ℃, and the dewaxing chamber is insulated for about 180 minutes.
Step S103: vacuumizing the dewaxing chamber, opening a third gate valve, conveying the material to the first degassing chamber, closing the third gate valve, vacuumizing the first degassing chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the first degassing chamber, and heating the material at a third preset temperature.
In the step, when the product is heated at a third preset temperature, the product is in a chemical deflation stage, so that the pyrolysis impurities in the product can be primarily removed.
Step S104: vacuumizing the first degassing chamber, opening a fourth gate valve, conveying the material to the second degassing chamber, closing the fourth gate valve, vacuumizing the second degassing chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the second degassing chamber, and heating the material at a fourth preset temperature.
In this step, when the product is heated at the fourth preset temperature, the product is in a chemical gassing stage, and the pyrolysis impurities in the product can be further removed.
Step S105: vacuumizing the second degassing chamber, vacuumizing the first sintering chamber, opening a fifth gate valve, conveying the material to the first sintering chamber, closing the fifth gate valve, vacuumizing the first sintering chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the first sintering chamber, and heating the material at a fifth preset temperature.
Step S106: vacuumizing the first sintering chamber, vacuumizing the second sintering chamber, opening a sixth gate valve, conveying the material to the second sintering chamber, closing the sixth gate valve, vacuumizing the second sintering chamber, selecting a proper atmosphere introducing valve according to the sintering process, introducing sintering atmosphere into the second sintering chamber, and heating the material at a sixth preset temperature.
Step S107: vacuumizing the second sintering chamber, vacuumizing the third sintering chamber, opening a seventh gate valve, conveying the material to the third sintering chamber, closing the seventh gate valve, vacuumizing the third sintering chamber, selecting a proper atmosphere introducing valve according to the sintering process, introducing sintering atmosphere into the third sintering chamber, and heating the material at a seventh preset temperature.
In steps S105, S106 and S107, when the product is heated at the fifth preset temperature, the sixth preset temperature and the seventh preset temperature in sequence, the product sintering heat treatment stage can reach the alloy material standard after three times of high-temperature sintering molding, and the product quality is ensured.
Step S108: and vacuumizing the third sintering chamber, vacuumizing the cooling chamber, opening an eighth gate valve, conveying the material to the cooling chamber, closing the eighth gate valve, selecting a proper atmosphere introducing valve according to the sintering process, introducing cooling atmosphere into the cooling chamber, and cooling the material.
In this step, the product is subjected to a cooling stage, and the product is cooled in a manner similar to rapid cooling and quenching, thus completing the final shaping.
In the specific application, the cooling atmosphere is flushed to the air cooling process requirement, the cooling fan is started, the cooling fan is operated to the process time, and the cooling temperature of the process requirement is reached.
Specifically, the cooling atmosphere is argon.
Step S109: and vacuumizing the cooling chamber to make the cooling chamber in an atmospheric state, opening a ninth gate valve, and taking out the materials.
In a specific application, after the ninth gate valve is opened, the material is conveyed to the take-out side trolley through the motor roller, and the production is completed.
Wherein the second preset temperature is 500 ℃, the third preset temperature is 800 ℃, the fourth preset temperature is 800 ℃, the fifth preset temperature is 1050 ℃, the sixth preset temperature is 1050 ℃, and the seventh preset temperature is 1050 ℃.
According to the eight-chamber vacuum continuous sintering furnace control method provided by the embodiment of the application, the materials are subjected to pretreatment, dewaxing, twice degassing, three-time sintering and cooling treatment continuously, and when the materials are treated, the corresponding atmosphere introducing valve is flexibly opened according to the sintering process, and the proper sintering atmosphere is rapidly introduced into the chamber, so that continuous production of various products can be completed according to the process setting, different sintering processes of different products can be satisfied, product differences caused by different personnel and different models are reduced, and the production quality and product consistency of the products are improved.
Further, before the gate valve is opened each time to convey materials, vacuum degree inspection and material detection are required to be carried out on the front cavity and the rear cavity corresponding to the gate valve, and when the front cavity and the rear cavity are in a vacuum state and no materials exist in the rear cavity, the gate valve between the two vacuum cavities can be opened to convey materials backwards.
Specifically, in the above embodiment, as shown in fig. 2 and 3, step S102 specifically includes:
s102.1: confirming that the preparation chamber is free of material.
S102.2: the slide valve pump 14, the roots pump 15, the rough drawing valves, the first gate valve and the second gate valve were confirmed to be in the closed state.
S102.3: the first vacuum break valve 16 is opened to bring the interior of the preparation chamber to normal atmospheric pressure, the first gate valve is opened to transfer material to the preparation chamber, and the first gate valve is closed.
S102.4: the slide valve pump 14, the first rough pump valve 17, and the second rough pump valve 18 are opened to pump the preparation chamber, and the preparation chamber is evacuated.
S102.5: the preparation chamber and dewaxing pipe heating wire are heated to and maintained at a first preset temperature, and impurities are discharged into the dewaxing tank 23.
S102.6: the third roughing valve 19 is opened, the first roughing valve 17 is closed, the atmosphere introduction valve is opened and maintained for a first preset period of time.
S102.7: after a first preset period of time, heating of the preparation chamber and dewaxing pipe heating wires is stopped.
Furthermore, the atmosphere introducing valve is used for introducing argon into the preparation chamber, and the material is not oxidized on the premise of ensuring that the temperature is more uniform and carrying impurities are more rapid by utilizing the characteristic of inert gas of the argon, so that the subsequent sintering quality of the material is ensured.
S102.8: the third rough pump valve 19 and the atmosphere introducing valve are closed, the first rough pump valve 17 is opened, and the preparation chamber is evacuated.
Specifically, in the above embodiment, as shown in fig. 2 and 3, step S102 specifically further includes:
s102.9: confirming that no material is in the preparation room.
S102.10: the first rough pump valve 17, the second rough pump valve 18 and the third rough pump valve 19 are closed, and the fourth rough pump valve 21 is opened to pump the wax removing tank 24, so that the wax removing tank 24 is vacuumized.
S102.11: the fourth roughing valve 21 is closed, the fifth roughing valve 22 is opened, impurities in the dewaxing tank 23 are discharged into the dewaxing tank 24, and the second preset time period is maintained.
In a specific application, the dewaxing tank 23 and the dewaxing tank 24 are placed in physical position to be communicated up and down, so that impurities are quickly discharged into the dewaxing tank 24 under the action of gravity.
S102.12: after a second preset period of time, the fifth rough pumping valve 22 is closed, the second vacuum breaking valve 25 is opened, and the wax removing tank 24 is exhausted, so that the interior of the wax removing tank 24 is at the standard atmospheric pressure.
S102.13: the sixth roughing valve 26 is opened to allow contaminants to drain from the wax drain tank 24.
Further, the impurities are collected and disposed of intensively after being discharged from the wax removing tank 24.
S102.14: the sixth rough suction valve 26 and the second vacuum break valve 25 are closed, the fourth rough suction valve 21 is opened, and the drain tank 24 is evacuated to vacuum the drain tank 24.
S102.15: the fourth rough pump valve 21 is closed, the first rough pump valve 17 and the second rough pump valve 18 are opened, and the preparation chamber is evacuated.
Wherein the first preset temperature is less than 200 ℃, the first preset time is 120 minutes, and the second preset time is 5 minutes.
In this technical scheme, before the material gets into the dewaxing room, carry out preheating to the material, carry out preliminary dewaxing to the material, make low additive of fusing point and other impurity in the material, carry to dewaxing jar 23 in along with the going on of third rough suction valve 19 evacuation, store to make the dewaxing room can dewax completely, improve the product quality of follow-up sintering.
In one possible implementation mode, a first temperature zone, a second temperature zone and a third temperature zone are arranged in the dewaxing chamber, and meanwhile, heating devices in the first temperature zone, the second temperature zone and the third temperature zone are started to heat materials in the dewaxing chamber in a partitioning mode, so that the dewaxing chamber is heated uniformly and reaches a first preset temperature.
In the technical scheme, the dewaxing chamber is subjected to temperature control in three areas, so that the temperature uniformity of the dewaxing chamber is greatly improved, and the temperature error value delta of the dewaxing chamber is less than or equal to 6 ℃.
Furthermore, except that the preparation room adopts single-area temperature control, other rooms adopt 1 main temperature control instrument and 2 auxiliary temperature control instruments to perform three-area temperature control, so that the uniformity of the temperature of each room in the whole process of heating treatment is ensured, and the quality of products is improved.
In one possible implementation, the preparation chamber is set to be at standard atmospheric pressure, the first gate valve is opened to transfer the material to the preparation chamber, the first gate valve is closed to vacuumize the preparation chamber, a proper atmosphere introducing valve is selected according to the sintering process to introduce sintering atmosphere into the preparation chamber, and after preheating the material at a first preset temperature, the method further comprises: after preheating the material for a first preset period of time, the preparation chamber is subjected to wax removal, and a second preset period of time is maintained.
In this technical scheme, utilize the preparation room to dewax the material before the material gets into dewaxing room to carry out preliminary dewaxing to the material through the supplementary dewaxing room of preparation room, improve continuous processing's convenience and treatment effeciency, then discharge the impurity in the preparation room, guarantee the continuity of lower wall material processing.
In one possible embodiment, the preparation chamber, the dewaxing chamber, the first degassing chamber, the second degassing chamber, the first sintering chamber, the second sintering chamber and the third sintering chamber are all communicated with a corresponding atmosphere regulating system, and a rough pumping valve and at least three atmosphere introducing valves are arranged in the atmosphere regulating system to regulate the components and the pressure of the sintering atmosphere in the chamber.
In one possible implementation mode, when the components and the pressure of the sintering atmosphere in the cavity are regulated, the rough drawing valve is firstly opened to exhaust the cavity, after the cavity is in a vacuum state, the atmosphere introducing valve is opened to introduce the sintering atmosphere into the cavity, and meanwhile, the rough drawing valve and the atmosphere introducing valve are regulated to carry out partial pressure so as to carry out different partial pressure atmosphere sintering on the materials in the cavity.
In the specific application, each chamber is provided with three atmosphere introduction valves, the pipeline calibers of the three atmosphere introduction valves are different, the adjustable range of partial pressure is improved, and the method is more suitable for different processes of partial pressure atmosphere sintering.
According to a second aspect of the present application, there is provided an eight-chamber vacuum continuous sintering furnace, applied to the eight-chamber vacuum continuous sintering furnace control method according to any one of the above-described technical solutions.
The eight-chamber vacuum continuous sintering furnace provided by the application adopts the eight-chamber vacuum continuous sintering furnace control method in any one of the technical schemes, so that the eight-chamber vacuum continuous sintering furnace comprises all the beneficial effects of the eight-chamber vacuum continuous sintering furnace control method, and the detailed description is omitted.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application. The foregoing is merely a preferred embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the application.
Claims (10)
1. The eight-chamber vacuum continuous sintering furnace control method is characterized by comprising the following steps of:
the method comprises the steps of enabling the interior of a preparation chamber to be at standard atmospheric pressure, opening a first gate valve, conveying materials to the preparation chamber, closing the first gate valve, vacuumizing the preparation chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the preparation chamber, and preheating the materials at a first preset temperature;
vacuumizing the preparation chamber, opening a second gate valve, conveying the material to the dewaxing chamber, closing the second gate valve, vacuumizing the dewaxing chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the dewaxing chamber, and heating the material at a second preset temperature;
vacuumizing the dewaxing chamber, opening a third gate valve, conveying the material to a first degassing chamber, closing the third gate valve, vacuumizing the first degassing chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the first degassing chamber, and heating the material at a third preset temperature;
vacuumizing the first degassing chamber, opening a fourth gate valve, conveying the material to a second degassing chamber, closing the fourth gate valve, vacuumizing the second degassing chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the second degassing chamber, and heating the material at a fourth preset temperature;
vacuumizing the second degassing chamber, vacuumizing the first sintering chamber, opening a fifth gate valve, conveying the material to the first sintering chamber, closing the fifth gate valve, vacuumizing the first sintering chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the first sintering chamber, and heating the material at a fifth preset temperature;
vacuumizing the first sintering chamber, vacuumizing the second sintering chamber, opening a sixth gate valve, conveying the material to the second sintering chamber, closing the sixth gate valve, vacuumizing the second sintering chamber, selecting a proper atmosphere introduction valve according to a sintering process, introducing sintering atmosphere into the second sintering chamber, and heating the material at a sixth preset temperature;
vacuumizing the second sintering chamber, vacuumizing the third sintering chamber, opening a seventh gate valve, conveying the material to the third sintering chamber, closing the seventh gate valve, vacuumizing the third sintering chamber, selecting a proper atmosphere introducing valve according to a sintering process, introducing sintering atmosphere into the third sintering chamber, and heating the material at a seventh preset temperature;
vacuumizing the third sintering chamber, vacuumizing the cooling chamber, opening an eighth gate valve, conveying the material to the cooling chamber, closing the eighth gate valve, selecting a proper atmosphere introducing valve according to the sintering process, introducing cooling atmosphere into the cooling chamber, and cooling the material;
and vacuumizing the cooling chamber to enable the cooling chamber to be in an atmospheric state, opening a ninth gate valve, and taking out the materials.
2. The eight-chamber vacuum continuous sintering furnace control method according to claim 1, wherein a first temperature zone, a second temperature zone and a third temperature zone are arranged in the dewaxing chamber, and heating devices in the first temperature zone, the second temperature zone and the third temperature zone are started at the same time to carry out zone heating on materials in the dewaxing chamber, so that the dewaxing chamber is heated uniformly and reaches the first preset temperature.
3. The eight-chamber vacuum continuous sintering furnace control method according to claim 1, wherein the preparation chamber is set to a standard atmospheric pressure, the first gate valve is opened to transfer the material to the preparation chamber, the first gate valve is closed to vacuumize the preparation chamber, a proper atmosphere introduction valve is selected according to the sintering process to introduce sintering atmosphere into the preparation chamber, and the method further comprises, after preheating the material at the first preset temperature:
and after preheating the materials for a first preset time period, performing wax removal on the preparation chamber, and maintaining a second preset time period.
4. The eight-chamber vacuum continuous sintering furnace control method according to claim 3, wherein the preparation chamber comprises a dewaxing system, wherein the interior of the preparation chamber is set to be at standard atmospheric pressure, the first gate valve is opened to transfer materials to the preparation chamber, the first gate valve is closed to vacuumize the preparation chamber, a proper atmosphere introducing valve is selected according to a sintering process to introduce sintering atmosphere into the preparation chamber, and preheating the materials at the first preset temperature comprises:
confirming that the preparation chamber is free of material;
confirming that a slide valve pump, a Roots pump, each rough pumping valve, the first gate valve and the second gate valve are in a closed state;
opening a first vacuum breaking valve to enable the interior of the preparation chamber to be at standard atmospheric pressure, opening a first gate valve to convey materials to the preparation chamber, and closing the first gate valve;
opening the slide valve pump, the first rough pumping valve and the second rough pumping valve, and pumping the preparation chamber to enable the preparation chamber to be in vacuum;
heating the preparation chamber and the dewaxing pipe heating wire to the first preset temperature, maintaining the first preset temperature, and discharging impurities into a dewaxing tank;
opening a third rough pumping valve, closing the first rough pumping valve, opening an atmosphere introducing valve and maintaining the first preset time period;
stopping heating the preparation chamber and the dewaxing pipe heating wire after the first preset time period;
and closing the third rough pumping valve and the atmosphere introducing valve, opening the first rough pumping valve, and pumping the preparation chamber to enable the preparation chamber to be in vacuum.
5. The eight chamber vacuum continuous sintering furnace control method according to claim 3, wherein the step of de-waxing the preparation chamber and maintaining the second preset time period comprises:
confirming that no material exists in the preparation room;
closing the first rough pumping valve, the second rough pumping valve and the third rough pumping valve, and opening the fourth rough pumping valve to pump air out of the wax removing tank so as to enable the wax removing tank to be in vacuum;
closing the fourth rough pumping valve, opening the fifth rough pumping valve, discharging impurities in the dewaxing tank into the dewaxing tank, and maintaining the second preset time period;
after the second preset time period, closing a fifth rough pumping valve, opening a second vacuum breaking valve, and exhausting the paraffin removal tank to enable the inside of the paraffin removal tank to be at standard atmospheric pressure;
opening a sixth rough pumping valve to discharge impurities from the paraffin removal tank;
closing the sixth rough pumping valve and the second vacuum breaking valve, opening the fourth rough pumping valve, and pumping the paraffin removal tank to enable the paraffin removal tank to be in vacuum;
and closing the fourth rough pumping valve, opening the first rough pumping valve and the second rough pumping valve, and pumping the preparation chamber to enable the preparation chamber to be in vacuum.
6. The eight-chamber vacuum continuous sintering furnace control method according to claim 5, wherein:
the first preset temperature is less than 200 ℃, the first preset time period is 120 minutes, and the second preset time period is 5 minutes.
7. The eight-chamber vacuum continuous sintering furnace control method according to claim 1, wherein the preparation chamber, the dewaxing chamber, the first degassing chamber, the second degassing chamber, the first sintering chamber, the second sintering chamber and the third sintering chamber are all communicated with corresponding atmosphere regulating systems, and rough drawing valves and at least three atmosphere introducing valves are arranged in the atmosphere regulating systems to regulate the components and the pressure of the sintering atmosphere in the chambers.
8. The eight chamber vacuum continuous sintering furnace control method of claim 7, wherein adjusting the composition and pressure of the sintering atmosphere in the chamber comprises:
firstly, the rough drawing valve is opened to exhaust the chamber, after the chamber is in a vacuum state, the atmosphere introducing valve is opened, sintering atmosphere is introduced into the chamber, and meanwhile, the rough drawing valve and the atmosphere introducing valve are regulated to carry out partial pressure so as to carry out different partial pressure atmosphere sintering on materials in the chamber.
9. The eight-chamber vacuum continuous sintering furnace control method according to claim 1, wherein:
the second preset temperature is 500 ℃, the third preset temperature is 800 ℃, the fourth preset temperature is 800 ℃, the fifth preset temperature is 1050 ℃, the sixth preset temperature is 1050 ℃, and the seventh preset temperature is 1050 ℃.
10. An eight-chamber vacuum continuous sintering furnace characterized by being applied to the eight-chamber vacuum continuous sintering furnace control method according to any one of claims 1 to 9.
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| CN104616880A (en) * | 2013-11-04 | 2015-05-13 | 三环瓦克华（北京）磁性器件有限公司 | Method for producing sintered NdFeB magnets |
| US20150243434A1 (en) * | 2014-05-11 | 2015-08-27 | Shenyang General Magnetic Co., Ltd. | Method and apparatus for sintering NdFeB Rare Earth Permanent Magnet |
| CN111283189A (en) * | 2020-03-26 | 2020-06-16 | 宁波恒普真空技术有限公司 | Vacuum degreasing sintering furnace with double internal pumping down pipelines |
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| JPS6277401A (en) * | 1985-09-30 | 1987-04-09 | Hitachi Condenser Co Ltd | Sintering device |
| US20010050212A1 (en) * | 2000-02-10 | 2001-12-13 | Shimadzu Mectem, Inc. | Continuous treatment apparatus |
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