CN110640135A - Powder metallurgy process - Google Patents
Powder metallurgy process Download PDFInfo
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- CN110640135A CN110640135A CN201910938369.XA CN201910938369A CN110640135A CN 110640135 A CN110640135 A CN 110640135A CN 201910938369 A CN201910938369 A CN 201910938369A CN 110640135 A CN110640135 A CN 110640135A
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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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
- B22F3/02—Compacting only
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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
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
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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
- B22F3/24—After-treatment of workpieces or articles
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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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/241—Chemical after-treatment on the surface
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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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
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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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
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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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The invention relates to a powder metallurgy process, which comprises the following steps: the method comprises the following steps of firstly, mixing materials, secondly, forming a blank, thirdly, degreasing, fourthly, sintering, fifthly, primarily shaping, sixthly, secondarily sintering, seventhly, shaping, eighthly, carrying out heat treatment, ninely, carrying out vacuum oil immersion, and tenthly, carrying out steam treatment. The invention has the effect of effectively improving the quality of the powder metallurgy product.
Description
Technical Field
The invention relates to the technical field of powder metallurgy, in particular to a powder metallurgy forming process.
Background
Powder metallurgy is a process technique for producing metal powder or metal powder (or a mixture of metal powder and nonmetal powder) as a raw material, and then forming and sintering the raw material to produce metal materials, composite materials and various products. The powder metallurgy method has similar places to the production of ceramics and belongs to the powder sintering technology, so a series of new powder metallurgy technologies can also be used for preparing ceramic materials. Due to the advantages of the powder metallurgy technology, the powder metallurgy technology becomes a key for solving the problem of new materials, and plays a significant role in the development of the new materials.
The prior Chinese patent with reference to the grant publication No. CN107790724A discloses a powder metallurgy process, which comprises the following steps: step one, extruding and crushing raw materials at 350-370 ℃, and adding a lubricant; step two, performing die casting in a die casting machine; step three, deburring the semi-finished product; and step four, obtaining a finished product. The invention has good performance and can be widely applied to high-strength structural parts, steel structure hard alloy and the like.
The above prior art solutions have the following drawbacks: in the production process, the quality of the powder metallurgy product is difficult to ensure in the preparation process of the powder metallurgy product only by adopting the powder metallurgy process.
Disclosure of Invention
The invention aims to provide a powder metallurgy process which can effectively improve the quality of powder metallurgy products.
The above object of the present invention is achieved by the following technical solutions:
a powder metallurgy process comprising the steps of:
step one, mixing materials, namely uniformly mixing metal powder and a lubricant according to a ratio to form raw material powder for later use;
step two, blank forming, namely putting the raw material powder mixed in the step one into a powder forming machine, sending the raw material powder into a preset product mold by the powder forming machine, pressing the raw material powder at normal temperature to form a blank of a product, and taking out the blank for later use;
step three, degreasing, namely heating the blank in the step two, keeping the heating temperature below 400 ℃, and keeping the heating time until all the lubricant in the blank is removed;
step four, sintering, namely rapidly putting the degreased workpiece in the step three into a high-temperature environment with a protective atmosphere at a temperature of more than 700 ℃ from a temperature of below 400 ℃ for sintering, enabling the blank to rapidly pass through the temperature range of 400-700 ℃, sintering for 2-3 hours, and forming a primary workpiece after sintering and cooling for later use;
step five, primary shaping, namely performing primary shaping on the sintered primary workpiece according to the shape of a finished workpiece, and picking out waste materials;
step six, secondary sintering, namely putting the shaped primary workpiece in the step five into a high-temperature environment of 1200 ℃, introducing protective atmosphere to sinter for 20-30min again, and sintering to obtain a semi-finished product for later use;
step seven, fine shaping, namely deburring the semi-finished product sintered in the step six, performing fine shaping according to product standards, and picking out unqualified products;
step eight, heat treatment, namely performing carburizing treatment and quenching treatment on the workpiece finished in the step seven,
step nine, vacuum oil immersion, namely cooling the workpiece which is processed in the step eight and performing vacuum oil immersion treatment;
step ten, steam treatment, namely cleaning the workpiece subjected to the vacuum oil immersion treatment in the step nine, and then performing steam treatment to form an anti-rust layer on the surface of the semi-finished product, wherein the finished product is obtained after the steam treatment is finished.
By adopting the technical scheme, the quality of the product is improved and the quality of the powder metallurgy product is effectively improved through multiple shaping, multiple sintering and heat treatment.
The invention is further configured to: and step three, heating by adopting natural gas or propane during degreasing and heating, and keeping the degreasing temperature at 250-400 ℃.
By adopting the technical scheme, the lubricating oil in the blank piece can be completely removed before high-temperature sintering.
The invention is further configured to: and step three, when the workpiece is degreased and heated, introducing heat-release gas.
By adopting the technical scheme, the proportion of natural gas or propane to air is reduced, the proportion is closer to the proportion of complete combustion, carbon in the gas is less after combustion, and the probability of carbon deposition on the surface of a blank piece is reduced
The invention is further configured to: and step three, introducing the heat-release gas into water, outputting the heat-release gas from the water and introducing the heat-release gas into a workpiece degreasing heat treatment position.
By adopting the technical scheme, the heat release gas is output after passing through water, so that the heat release gas contains water vapor, and then the water vapor is introduced into a workpiece degreasing treatment part, so that carbon black can be reduced.
The invention is further configured to: and step four, controlling the sintering temperature of the workpiece to be 950-1150 ℃.
The invention is further configured to: and step four, introducing liquid ammonia into the high-temperature sintering environment to generate a protective atmosphere of nitrogen-hydrogen mixed gas.
By adopting the technical scheme, the adopted nitrogen can protect the workpiece in the sintering process, the external oxygen is isolated from entering, and the adopted hydrogen can reduce oxygen to avoid oxidation of the blank.
The invention is further configured to: the firing equipment who adopts in step three and step four is continuous heating furnace, continuous heating furnace includes the support body, the support body sets gradually degreasing zone heated warehouses, sintering heated warehouses and the water cooling storehouse of mutual intercommunication along its length direction, the water cooling storehouse includes the fixed water-cooling jacket that communicates with the sintering heated warehouses and connects in the circulating water-cooling jacket of fixed water-cooling jacket one end, the support body still is provided with and wears to establish degreasing heated warehouses, sintering heated warehouses and water cooling storehouse steel mesh conveyer belt in proper order, fixed water-cooling jacket includes the cold water district and sets up in the exhaust area of cold water district upside, the rigid coupling of the exhaust area of fixed water-cooling jacket has the intake pipe that the lower extreme extends to the cold water district, the other end of fixed water-cooling jacket still rigid coupling has the blast pipe that the intercommunication was gone in the exhaust, blast pipe and.
By adopting the technical scheme, the blank can enter the degreasing heating bin to be heated along with the steel mesh conveyor belt in sequence, then enters the sintering heating bin to be heated, finally enters the water cooling bin to be cooled, and the discharging is finished, in addition, the heat release type gas can be input into the fixed water cooling jacket through the air inlet pipe, so that the heat release type gas is sent into the degreasing bin, on one hand, the proportion of natural gas or propane and air is reduced, the proportion is close to the proportion of complete combustion, the carbon content of the gas is less after the combustion, and the probability of carbon deposition on the surface of the blank is reduced, on the other hand, the heat release type gas contains water vapor and is introduced into the workpiece degreasing treatment position, so that the carbon black can be reduced, and then the fixed water cooling jacket is arranged secondarily, the workpiece just conveyed out of the sintering bin can be cooled slowly, and the workpiece just conveyed out of the sintering heating bin is prevented from directly, and protecting the workpiece.
The invention is further configured to: one side rigid coupling of sintering heating storehouse has the blast pipe with sintering heating storehouse intercommunication, the one end of blast pipe is provided with the ammonia liquid storage jar that can communicate with the blast pipe.
Through adopting above-mentioned technical scheme, can send the ammonia to the sintering heated warehouses in through the air feed pipe to make the ammonia decompose and generate hydrogen and nitrogen gas in heated warehouses in high temperature environment, thereby make nitrogen gas protect the work piece of sintering in-process, isolated external oxygen's entering makes hydrogen reduction oxygen avoid blank oxidation.
The invention is further configured to: and one end of the fixed water-cooling jacket, which is far away from the sintering heating bin, is obliquely and downwards arranged.
By adopting the technical scheme, the nitrogen can flow downwards from one end of the fixed water-cooling jacket due to the large specific gravity of the nitrogen, so that the workpieces in the fixed water-cooling jacket and the circulating water-cooling jacket are protected, and the gas for protecting the workpieces is filled in the fixed water-cooling jacket and the circulating water-cooling jacket.
The invention is further configured to: one end of the circulating water-cooling jacket, which is far away from the fixed water-cooling jacket, is provided with a flexible curtain.
Through adopting above-mentioned technical scheme, the flexible check curtain of adoption can shelter from the end that the cooling jacket was pressed from both sides to the circulation water-cooling to avoid external wind to flow backward from the cooling jacket of circulation water to the cooling jacket of circulation water in.
In conclusion, the beneficial technical effects of the invention are as follows:
1. after multiple shaping, multiple sintering and heat treatment, the quality of the product is improved, and the quality of the powder metallurgy product is effectively improved;
2. the proportion of natural gas or propane and air is reduced, the proportion is closer to the proportion of complete combustion, carbon contained in the gas is less after combustion, and the probability of carbon deposition on the surface of a blank piece is reduced;
3. the adopted nitrogen can protect the workpiece in the sintering process and isolate the external oxygen from entering, and the adopted hydrogen can reduce the oxygen to avoid the oxidation of the blank.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
FIG. 2 is a schematic view of the structure of the continuous heating furnace of the present invention.
FIG. 3 is a schematic view of the structure of the fixed water-cooling jacket of the present invention.
In the figure, 1, a furnace frame; 2. a degreasing heating bin; 3. sintering and heating the bin; 31. an air supply pipe; 32. an ammonia liquid storage tank; 4. a water cooling bin; 41. fixing a water-cooling jacket; 411. a cold water region; 412. an exhaust area; 413. sealing the cover plate; 414. an air inlet pipe; 415. an exhaust pipe; 42. a circulating water cooling jacket; 421. a flexible curtain.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the powder metallurgy process disclosed by the invention comprises the following steps:
step one, mixing materials, namely uniformly mixing metal powder and a lubricant according to a ratio to form raw material powder for later use;
step two, blank forming, namely putting the raw material powder mixed in the step one into a powder forming machine, sending the raw material powder into a preset product mold by the powder forming machine, pressing the raw material powder at normal temperature to form a blank of a product, and taking out the blank for later use;
step three, degreasing, namely heating the blank in the step two by adopting natural gas or propane, keeping the heating temperature below 400 ℃, preferably 250-400 ℃, keeping the heating time for ensuring that all lubricants in the blank are removed, introducing heat-release gas when the workpiece is degreased and heated, reducing the proportion of the natural gas or propane and air to enable the natural gas or propane and air to be closer to the proportion of complete combustion, reducing the carbon content of the gas after combustion, reducing the probability of carbon deposition on the surface of the blank, introducing the heat-release gas into water, outputting the heat-release gas from the water, introducing the heat-release gas into a workpiece degreasing heat treatment part, enabling the heat-release gas to contain water vapor, and introducing the water vapor into the workpiece degreasing heat treatment part to reduce carbon black;
step four, sintering, namely rapidly putting the degreased workpiece in the step three into an environment above 700 ℃ from below 400 ℃ for sintering, preferably controlling the sintering temperature to be 950-1150 ℃, enabling the blank to rapidly pass through the temperature range of 400-700 ℃, sintering for 2-3 hours, meanwhile, introducing ammonia gas into the high-temperature sintering environment to generate a protective atmosphere of mixed gas of nitrogen and hydrogen, enabling the nitrogen gas to protect the workpiece in the sintering process, isolating the external oxygen from entering, enabling the hydrogen gas to reduce oxygen to avoid the blank from being oxidized, and forming a primary workpiece after sintering and cooling for later use;
step five, primary shaping, namely performing primary shaping on the sintered primary workpiece according to the shape of a finished workpiece, and picking out waste materials;
step six, secondary sintering, namely putting the shaped primary workpiece in the step five into a high-temperature environment of 1200 ℃, introducing protective atmosphere to sinter for 20-30min again, and sintering to obtain a semi-finished product for later use;
step seven, fine shaping, namely deburring the semi-finished product sintered in the step six, performing fine shaping according to product standards, and picking out unqualified products;
step eight, heat treatment, namely performing carburizing treatment and quenching treatment on the workpiece finished in the step seven,
step nine, vacuum oil immersion, namely cooling the workpiece which is processed in the step eight and performing vacuum oil immersion treatment;
step ten, steam treatment, namely cleaning the workpiece subjected to the vacuum oil immersion treatment in the step nine, and then performing steam treatment to form an anti-rust layer on the surface of the semi-finished product, wherein the finished product is obtained after the steam treatment is finished.
Referring to fig. 2 and 3, the heating device adopted in the third step and the fourth step is a continuous heating furnace, the continuous heating furnace comprises a frame body, the frame body is sequentially provided with a degreasing area heating bin, a sintering heating bin 3 and a water cooling bin 4 which are communicated with each other along the length direction of the frame body, and the frame body is further provided with a steel mesh conveyor belt which can sequentially penetrate through the degreasing heating bin 2, the sintering heating bin 3 and the water cooling bin 4. Degreasing zone heating storehouse, all be provided with heating device in the sintering heating storehouse 3, heating device can be for the flame gun (no longer giving details for prior art here), one side rigid coupling of sintering heating storehouse 3 has the blast pipe 31 with sintering heating storehouse 3 intercommunication, the one end of blast pipe 31 is provided with the ammoniacal liquor storage jar 32 that can communicate with blast pipe 31, the one end slope that sintering heating storehouse 3 was kept away from to fixed water-cooling jacket 41 sets up downwards, the one end that keeps away from fixed water-cooling jacket 41 of circulation water-cooling jacket 42 is provided with the flexible curtain 421 that can shelter from circulation water-cooling jacket 42 and keep away from fixed water-cooling jacket 41 one end.
The water cooling bin 4 comprises a fixed water cooling jacket 41 communicated with the sintering heating bin 3 and a circulating water cooling jacket 42 connected to one end of the fixed water cooling jacket 41, the fixed water cooling jacket 41 comprises a cold water area 411 and an exhaust area 412 arranged on the upper side of the cold water area 411, and a sealing cover plate 413 capable of opening the exhaust area 412 is further arranged on the upper side of the fixed water cooling jacket 41. An air inlet pipe 414 with the lower end extending to the cold water area 411 is fixedly connected to the exhaust area 412 of the fixed water-cooling jacket 41, an exhaust pipe 415 for exhaust communication is also fixedly connected to the other end of the fixed water-cooling jacket 41, and the exhaust pipe 415 is communicated with the degreasing heating bin 2.
Blank can get into and get into degrease heated warehouses 2 along with the steel mesh conveyer belt in proper order and heat, then get into sintering heated warehouses 3 and heat and get into the cooling of water cooling storehouse 4 at last, accomplish the ejection of compact, in addition, can deliver to sintering heated warehouses 3 in with the ammonia through air feed pipe 31, thereby make the ammonia be in high temperature environment in the heated warehouses and decompose formation hydrogen and nitrogen gas, thereby make nitrogen gas protect the work piece of sintering in-process, the entering of isolated external oxygen, make hydrogen reduction oxygen avoid the blank oxidation. The nitrogen gas has a high specific gravity, and therefore, the nitrogen gas can flow downward from one end of the fixed water-cooling jacket 41, and protects the workpieces in the fixed water-cooling jacket 41 and the circulating water-cooling jacket 42, and the fixed water-cooling jacket 41 and the circulating water-cooling jacket 42 are filled with the gas for protecting the workpieces. The adopted flexible curtain 421 can shield the tail end of the circulating water cooling jacket 42, so as to prevent outside air from flowing backwards from the circulating water cooling jacket 42 into the circulating water cooling jacket 42.
Secondly, the exothermic gas is input into the fixed water-cooling jacket 41 through the air inlet pipe 414, so that the exothermic gas is sent into the degreasing bin, on one hand, the proportion of natural gas or propane and air is reduced, the proportion is closer to the proportion of complete combustion, the carbon content of the gas is less after combustion, and the probability of carbon deposition on the surface of a blank piece is reduced, on the other hand, the exothermic gas contains water vapor and is introduced into a workpiece degreasing treatment part, so that the carbon deposition can be reduced, and then the next fixed water-cooling jacket 41 is arranged, so that the workpiece which is just conveyed out of the sintering bin can be slowly cooled, the workpiece which is just conveyed out of the sintering heating bin 3 is prevented from directly entering a circulating cold water jacket with lower temperature, and the workpiece is protected.
Claims (10)
1. A powder metallurgy process, characterized by: the method comprises the following steps:
step one, mixing materials, namely uniformly mixing metal powder and a lubricant according to a ratio to form raw material powder for later use;
step two, blank forming, namely putting the raw material powder mixed in the step one into a powder forming machine, sending the raw material powder into a preset product mold by the powder forming machine, pressing the raw material powder at normal temperature to form a blank of a product, and taking out the blank for later use;
step three, degreasing, namely heating the blank in the step two, keeping the heating temperature below 400 ℃, and keeping the heating time until all the lubricant in the blank is removed;
step four, sintering, namely rapidly putting the degreased workpiece in the step three into a high-temperature environment with a protective atmosphere at a temperature of more than 700 ℃ from a temperature of below 400 ℃ for sintering, enabling the blank to rapidly pass through the temperature range of 400-700 ℃, sintering for 2-3 hours, and forming a primary workpiece after sintering and cooling for later use;
step five, primary shaping, namely performing primary shaping on the sintered primary workpiece according to the shape of a finished workpiece, and picking out waste materials;
step six, secondary sintering, namely putting the shaped primary workpiece in the step five into a high-temperature environment of 1200 ℃, introducing protective atmosphere to sinter for 20-30min again, and sintering to obtain a semi-finished product for later use;
step seven, fine shaping, namely deburring the semi-finished product sintered in the step six, performing fine shaping according to product standards, and picking out unqualified products;
step eight, heat treatment, namely performing carburizing treatment and quenching treatment on the workpiece finished in the step seven,
step nine, vacuum oil immersion, namely cooling the workpiece which is processed in the step eight and performing vacuum oil immersion treatment;
step ten, steam treatment, namely cleaning the workpiece subjected to the vacuum oil immersion treatment in the step nine, and then performing steam treatment to form an anti-rust layer on the surface of the semi-finished product, wherein the finished product is obtained after the steam treatment is finished.
2. A powder metallurgy process according to claim 1, wherein: and step three, heating by adopting natural gas or propane during degreasing and heating, and keeping the degreasing temperature at 250-400 ℃.
3. A powder metallurgy process according to claim 1, wherein: and step three, when the workpiece is degreased and heated, introducing heat-release gas.
4. A powder metallurgy process according to claim 3, wherein: and step three, introducing the heat-release gas into water, outputting the heat-release gas from the water and introducing the heat-release gas into a workpiece degreasing heat treatment position.
5. A powder metallurgy process according to claim 1, wherein: and step four, controlling the sintering temperature of the workpiece to be 950-1150 ℃.
6. A powder metallurgy process according to claim 1, wherein: and step four, introducing liquid ammonia into the high-temperature sintering environment to generate a protective atmosphere of nitrogen-hydrogen mixed gas.
7. A powder metallurgy process according to claim 1, wherein: the heating equipment adopted in the third step and the fourth step is a continuous heating furnace, the continuous heating furnace comprises a frame body, the frame body is sequentially provided with a degreasing area heating bin, a sintering heating bin (3) and a water cooling bin (4) which are communicated with each other along the length direction of the frame body, the water cooling bin (4) comprises a fixed water cooling jacket (41) communicated with the sintering heating bin (3) and a circulating water cooling jacket (42) connected to one end of the fixed water cooling jacket (41), the frame body is further provided with a steel mesh conveying belt capable of sequentially penetrating through the degreasing heating bin (2), the sintering heating bin (3) and the water cooling bin (4), the fixed water cooling jacket (41) comprises a cold water area (411) and an exhaust area (412) arranged on the upper side of the cold water area (411), and an air inlet pipe (414) with the lower end extending to the cold water area (411) is fixedly connected to the exhaust area (412) of the fixed water cooling, the other end of the fixed water-cooling jacket (41) is also fixedly connected with an exhaust pipe (415) for communicating exhaust gas, and the exhaust pipe (415) is communicated with the degreasing heating bin (2).
8. A powder metallurgy process according to claim 7, wherein: one side rigid coupling of sintering heating storehouse (3) has with sintering heating storehouse (3) intercommunication air feed pipe (31), the one end of air feed pipe (31) is provided with ammonia liquid storage jar (32) that can communicate with air feed pipe (31).
9. A powder metallurgy process according to claim 8, wherein: and one end of the fixed water-cooling jacket (41) far away from the sintering heating bin (3) is obliquely and downwards arranged.
10. A powder metallurgy process according to claim 9, wherein: one end of the circulating water cooling jacket (42) far away from the fixed water cooling jacket (41) is provided with a flexible curtain (421).
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| CN112518940A (en) * | 2020-11-18 | 2021-03-19 | 袁文强 | Bamboo long handle strainer burr removing equipment |
| CN112985052A (en) * | 2021-04-09 | 2021-06-18 | 江西科技学院 | Tunnel type continuous sintering furnace and sintering method thereof |
| CN115156534A (en) * | 2022-07-05 | 2022-10-11 | 广东华于科技股份有限公司 | Stamping process and equipment for powder metallurgy |
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