CN110359009B - Multi-gas co-permeation strengthening system and process thereof - Google Patents
Multi-gas co-permeation strengthening system and process thereof Download PDFInfo
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- CN110359009B CN110359009B CN201910730149.8A CN201910730149A CN110359009B CN 110359009 B CN110359009 B CN 110359009B CN 201910730149 A CN201910730149 A CN 201910730149A CN 110359009 B CN110359009 B CN 110359009B
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- 238000000034 method Methods 0.000 title claims abstract description 21
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- 238000010438 heat treatment Methods 0.000 claims abstract description 54
- 239000007789 gas Substances 0.000 claims abstract description 40
- 238000001816 cooling Methods 0.000 claims abstract description 37
- 238000001764 infiltration Methods 0.000 claims abstract description 30
- 238000007599 discharging Methods 0.000 claims abstract description 25
- 230000001737 promoting effect Effects 0.000 claims abstract description 25
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000008595 infiltration Effects 0.000 claims abstract description 20
- BZEWSMSQJGHWKJ-UHFFFAOYSA-N [Cr].[S].[C] Chemical compound [Cr].[S].[C] BZEWSMSQJGHWKJ-UHFFFAOYSA-N 0.000 claims abstract description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000035515 penetration Effects 0.000 claims abstract description 10
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- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
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- 229910003472 fullerene Inorganic materials 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 6
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims description 6
- 239000002153 silicon-carbon composite material Substances 0.000 claims description 6
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- RAGLTCMTCZHYEJ-UHFFFAOYSA-K azanium;chromium(3+);disulfate Chemical compound [NH4+].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RAGLTCMTCZHYEJ-UHFFFAOYSA-K 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 238000010792 warming Methods 0.000 claims description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 229910021555 Chromium Chloride Inorganic materials 0.000 claims description 3
- QSWDMMVNRMROPK-UHFFFAOYSA-K chromium(3+) trichloride Chemical compound [Cl-].[Cl-].[Cl-].[Cr+3] QSWDMMVNRMROPK-UHFFFAOYSA-K 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000010790 dilution Methods 0.000 claims description 3
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- 230000007935 neutral effect Effects 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- QNEOJYVTULAMFR-UHFFFAOYSA-K C(=O)N.[Cr+3].S(=O)(=O)([O-])[O-].[NH4+].S(=O)(=O)([O-])[O-] Chemical compound C(=O)N.[Cr+3].S(=O)(=O)([O-])[O-].[NH4+].S(=O)(=O)([O-])[O-] QNEOJYVTULAMFR-UHFFFAOYSA-K 0.000 claims description 2
- 238000000643 oven drying Methods 0.000 claims 1
- 238000005121 nitriding Methods 0.000 abstract description 12
- 229910021529 ammonia Inorganic materials 0.000 abstract description 6
- 238000005254 chromizing Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 229910052717 sulfur Inorganic materials 0.000 abstract description 3
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- 238000005987 sulfurization reaction Methods 0.000 abstract description 3
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- 238000005255 carburizing Methods 0.000 abstract description 2
- 238000005536 corrosion prevention Methods 0.000 abstract 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
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- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
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- YYXHRUSBEPGBCD-UHFFFAOYSA-N azanylidyneiron Chemical compound [N].[Fe] YYXHRUSBEPGBCD-UHFFFAOYSA-N 0.000 description 1
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- 238000010000 carbonizing Methods 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C12/00—Solid state diffusion of at least one non-metal element other than silicon and at least one metal element or silicon into metallic material surfaces
- C23C12/02—Diffusion in one step
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Tunnel Furnaces (AREA)
- Furnace Details (AREA)
Abstract
The invention discloses a multi-gas co-permeation strengthening system and a process thereof, belongs to the technical field of workpiece heat treatment, solves the problems of poor environmental protection, poor permeation effect and single permeation layer of the traditional heat treatment, and comprises a feeding unit, a ventilation unit, a heating pre-permeation unit, a multi-gas co-permeation strengthening unit, a cooling protection unit and a discharging unit which are sequentially connected. The invention replaces the traditional acid corrosion prevention process by the matching of all units, improves the environmental protection property, utilizes the ventilation unit, avoids air participation, improves the sufficiency of polyatomic penetration, combines the heating up pre-infiltration unit with microwave radiation, changes the surface tissue structure of the lamp post, accelerates the penetration speed and the depth of subsequent nitrogen element, sulfur element and chromium element, adopts the nitriding treatment in the ammonia atmosphere and then adopts the permeation promoting ball B to release gaseous carbon-sulfur-chromium complex compound during the multi-element gas co-infiltration strengthening treatment, realizes the carburizing, sulfurization and chromizing co-infiltration treatment, realizes the compound diversification of the infiltrated layer tissue, and improves the surface hardness of the lamp post.
Description
Technical Field
The invention belongs to the technical field of workpiece heat treatment, and particularly relates to a multi-gas co-permeation strengthening system and a process thereof.
Background
The heat treatment industry relates to equipment or production lines of amino atmosphere, which are all box type or push rod type equipment or production lines, but the equipment or production lines cannot realize the heat treatment of large and ultra-large objects such as road lamp poles, communication towers and the like. Meanwhile, the low-temperature heat treatment usually adopts nitriding, soft nitriding, carbonizing and other methods, and the methods not only have single infiltration element, long infiltration time, shallow infiltration layer and poor comprehensiveness, but also easily cause poor corrosion resistance, wear resistance and hardness of treated parts.
Disclosure of Invention
The invention aims to provide a multi-gas co-permeation strengthening system and a process thereof, which have the advantages of strong environmental protection, good permeation effect and permeation layer compounding diversification.
In order to realize the technical purpose, the multi-element gas co-permeation strengthening system and the process thereof adopt the technical scheme that:
a multi-gas co-permeation strengthening system comprises a feeding unit, a ventilation unit, a heating pre-permeation unit, a multi-gas co-permeation strengthening unit, a cooling protection unit and a discharging unit which are sequentially connected;
the feeding unit comprises a feeding frame, a skip travelling mechanism arranged below the feeding frame and a plurality of conveying rollers which travel along the surface of the feeding frame and penetrate through each unit;
the air exchange unit comprises a front air exchange chamber arranged at the front part of the warming and pre-infiltrating unit and a rear air exchange chamber arranged at the rear part of the cooling protection unit;
the heating and pre-infiltrating unit comprises a heating furnace, the front end and the rear end of the heating furnace are respectively provided with a sealed heat-insulating middle door and a sealed heat-insulating middle door, a first explosion-proof port arranged on the surface of the heating furnace is arranged at a position close to the heat-insulating middle door, the heating furnace comprises a shell, a first heat-insulating layer arranged on the inner wall of the shell and first heating elements arranged at the upper end and the lower end in the shell, the surface of the shell is connected with a first microwave generator, a penetration promoting ball A is embedded on the surface of the first heat-insulating layer, the surface of the shell is communicated with a plurality of fans, and;
the multi-element gas co-permeation strengthening unit comprises a co-permeation chamber shell, the front end and the rear end of the co-permeation chamber shell are respectively connected with a middle door and a sealed middle door, a second explosion-proof opening is formed in the position close to the sealed middle door, the surface of the co-permeation chamber shell is connected with a second microwave generator, the inner wall of the co-permeation chamber shell is filled with a second heat insulation layer, a permeation promoting ball B is embedded in the surface of the second heat insulation layer and the bottom of the co-permeation chamber shell, a sliding rail is arranged at the bottom of the second heat insulation layer along the extending direction, a pulley is connected in the sliding rail in a sliding mode, a connecting rod is fixedly connected with the pulley through a connecting ring, a rack meshed with a transmission gear is laid on the surface of the connecting rod, a driven gear arranged on the surface of the rack is meshed at the bottom of the transmission gear, a steering transmission shaft, a plurality of second heating elements are uniformly distributed on the surface of the rotary vane, the bottom of the connecting rod is in threaded connection with a positioning seat, and a micro motor for driving the positioning seat to move along the surface of the connecting rod is arranged on the side part of the positioning seat;
the cooling protection unit comprises a third inner furnace door arranged at the rear end of the sealed middle door, a cooling chamber shell is arranged between the sealed middle door and the third inner furnace door, a heat insulation lining layer is filled at the bottom of the cooling chamber shell, the surface of the cooling chamber shell is connected with a shell-and-tube heat exchanger through a pipeline, and the shell-and-tube heat exchanger is respectively communicated with the heating furnace and the co-permeation chamber through pipelines;
the discharging unit comprises a discharging frame, a skip travelling mechanism arranged below the discharging frame, and a plurality of conveying rollers running through each unit and travelling along the surface of the discharging frame.
Preferably, the charging tray that bears the weight of the lamp member is laid on the transfer roller surface, the feeding frame is equipped with the grudging post with the lateral part of taking a breath the unit junction, grudging post upper portion is equipped with the lamp member inductor, and the surperficial embedded vertical servo module that has, servo module surface is equipped with the limiting plate that blocks the work piece and march, the limiting plate bottom is equipped with and arranges the magnet of the electromagnet looks actuation of feeding frame below in.
Preferably, the front ventilation chamber comprises a front furnace door arranged at the front end, a first inner furnace door arranged at the tail end and a front ventilation chamber shell connecting the front furnace door and the first inner furnace door, the conveying roller enters from the front furnace door and extends to the first inner furnace door along the interior of the front ventilation chamber shell, and a first vacuum ventilation system for promoting the interior of the front ventilation chamber shell to be in a vacuum state is arranged on the surface of the front ventilation chamber shell.
Preferably, the back ventilation chamber comprises a second inner oven door arranged at the back of the cooling protection unit, a back oven door arranged at the tail end and a back ventilation chamber shell connected with the second inner oven door and the back oven door, the conveying roller enters from the second inner oven door and extends to the back oven door along the inside of the back ventilation chamber shell, and a second vacuum ventilation system is arranged on the surface of the back ventilation chamber shell.
A multi-element gas co-permeation strengthening process comprises the following steps:
(1) after sand blasting is carried out on the lamp post to be processed, the lamp post to be processed is overlapped and placed in a material tray and is conveyed to each unit through a conveying roller;
(2) the lamp pole piece is conveyed into the front ventilation chamber by the conveying roller, the sensor of the lamp pole piece emits laser, the total outer diameter sum of the lamp pole pieces is calculated according to the comparison between the laser return time and the blank return time, the number of the lamp pole pieces is calculated by utilizing the historical data of the outer diameter of a single lamp pole piece, signals are transmitted to the electromagnet, when a set value is reached, the vertical servo module moves downwards, the bottom magnet is attracted with the electromagnet, the limiting plate is enabled to move downwards rapidly to block the conveying of the lamp pole pieces, the lamp pole pieces are stopped to be put in, then the magnet and the electromagnet repel each other, the limiting plate moves upwards, and;
(3) starting a first vacuum ventilation system to extract air from the front ventilation chamber, so as to avoid the air from participating in processing;
(4) when the temperature in the heating furnace reaches 400-460 ℃, the fullerene in the permeation promoting ball A is oxidized at high temperature to generate CO2C gas is permeated, meanwhile, tufftride is promoted, the lamp pole is conveyed to the heating furnace by the conveying roller, and microwave radiation is carried out for 20 min;
(5) when the temperature in the co-infiltration chamber rises to 470-570 ℃, introducing ammonia gas, performing heat preservation and microwave radiation for 30min, and then when the temperature rises to 570-590 ℃, gradually releasing gaseous carbon-sulfur-chromium complex in the permeation promoting ball B to form a mixed infiltration layer on the surface of the lamp post, wherein the tissue thickness reaches 20-50 um;
(6) conveying the permeated lamp pole piece into a cooling chamber shell by a conveying roller, filling nitrogen into the cooling chamber shell to protect the lamp pole piece, starting a fan to quickly reduce the temperature in the cooling chamber shell to be below 540 ℃, and then gradually cooling by air;
(7) starting a second vacuum ventilation system, carrying out air extraction on the rear ventilation chamber to enable the rear ventilation chamber to be in a vacuum state, and conveying the cooled lamp post to the rear ventilation chamber by using a conveying roller to prepare for discharging;
(8) and the lamp rod piece after the seepage layer is cooled is conveyed to a discharging frame by the conveying roller, and is collected and stored.
Preferably, the preparation method of the penetration-promoting ball A in the step (4) comprises the following steps: 1) dissolving a proper amount of oxide fibers and fullerene in a carbon tetrachloride solution, and soaking for 20-30 min; 2) taking out the soaked mixture and placing in CO2Cold drying in the atmosphere; 3) coating silica sol liquid on the surface of the mixture, vacuum-drying, and repeating for multiple times until the surface of the mixture is covered with a silica gel layer; 4) and (5) drying in an oven.
Preferably, the preparation method of the penetration-promoting ball B in the step (5) comprises the following steps: 1) dissolving potassium dichromate in concentrated sulfuric acid, adding deionized water for dilution, adding graphite, fully stirring, centrifuging, washing to be neutral, and preserving heat and drying to obtain expanded graphite; 2) adding silicon monoxide and expanded graphite into a phenolic resin solvent, dispersing, and pyrolyzing at high temperature to obtain an expanded graphite/silicon-silicon dioxide/carbon composite material; 3) filling the carbon-sulfur-chromium complex into the expanded graphite/silicon-silicon dioxide/carbon composite material, and performing high-temperature heat treatment to obtain the permeation-promoting ball B capable of slowly releasing the gaseous carbon-sulfur-chromium complex.
Preferably, the gaseous carbon sulfur chromium complex is a combined complex formed by one or two of carbon disulfide solution of chromium ammonium sulfate and formamide solution of chromium ammonium sulfate and chromium chloride.
Compared with the prior art, the invention has the beneficial effects that:
1. the system replaces the traditional process for preparing the anticorrosive coating by soaking through the matching of all units, thereby avoiding the generation of a large amount of waste acid and waste liquid and causing environmental pollution;
2. according to the invention, the ventilation units are respectively arranged at the front end and the rear end of the whole system, and the vacuum ventilation system is utilized, so that the multi-element permeation process of the lamp post is free from air participation, the sufficiency of polyatomic permeation is improved, and meanwhile, toxic gas generated in the ammonia nitriding process is extracted and centralized, so that the harm to workers is avoided, and the environmental protection performance is improved;
3. according to the invention, the temperature-rising pre-permeation unit is provided with the permeation promoting ball A, and the microwave radiation is combined to change the surface structure of the lamp post, so that a micro C layer is formed on the surface, the permeation speed and the permeation depth of subsequent nitrogen, sulfur and chromium elements are accelerated, and the problem that the surface of the lamp post is blackened due to the lack of a buffer stage caused by overhigh nitriding temperature is solved;
4. according to the invention, the link rod is arranged in the multi-element gas co-permeation strengthening unit, slides axially along the co-permeation chamber shell and is matched with the rotary vane to rotate, so that heat generated by the heating element is spirally and uniformly distributed in the co-permeation chamber, ammonia gas is uniformly absorbed and then is uniformly distributed on the surface of the lamp post, uniform distribution of a permeation layer tissue is realized, and the quality of the lamp post is improved;
5. when the multi-element gas co-permeation strengthening treatment is carried out, firstly, ammonia gas atmosphere nitriding treatment is adopted, and then the permeation promoting ball B is adopted to release the gaseous carbon-sulfur-chromium complex, so that carburizing, sulfurizing and chromizing treatment are realized, the carburized layer tissue is compounded and diversified, the surface hardness of the lamp rod piece is greatly improved, the friction coefficient is reduced, and the fatigue resistance is improved.
Drawings
FIG. 1 is a schematic view of the overall arrangement of the present invention;
FIG. 2 is a schematic view of the structure of a feed unit in the present invention;
FIG. 3 is a schematic diagram of the configuration of the front ventilation chamber of the present invention;
FIG. 4 is a schematic structural view of a temperature-elevating pre-infiltration unit according to the present invention;
FIG. 5 is a schematic structural diagram of a multi-component gas permeation enhancing unit according to the present invention;
FIG. 6 is a schematic view of the structure of the cooling protection unit according to the present invention;
FIG. 7 is a schematic diagram of the configuration of the rear ventilation chamber of the present invention;
FIG. 8 is a schematic view of the structure of the discharging unit of the present invention.
In the figure: 1. a feeding frame; 2. a skip car travelling mechanism; 3. a conveying roller; 4. a pre-ventilation chamber; 5. a rear ventilation chamber; 6. a heat-insulating middle door; 7. a middle door; 8. a first explosion-proof port; 9. a housing; 10. a first insulating layer; 11. a first heating element; 12. a first microwave generator; 13. a fan; 14. a thermocouple; 15. a co-permeation chamber housing; 16. sealing the middle door; 17. a second explosion-proof port; 18. a second microwave generator; 19. a second insulating layer; 20. a slide rail; 21. a pulley; 22. a connecting ring; 23. a link rod; 24. a transmission gear; 25. a rack; 26. a driven gear; 27. a steering transmission shaft; 28. a coupling; 29. rotating leaves; 30. a second heating element; 31. positioning seats; 32. a micro motor; 33. a third inner oven door; 34. a cooling chamber housing; 35. a thermal insulation lining layer; 36. a shell-and-tube heat exchanger; 37. a discharging frame; 38. a material tray; 39. erecting a frame; 40. a lamp rod member sensor; 41. a servo module; 42. a limiting plate; 43. an electromagnet; 44. a magnet; 401. a front oven door; 402. a first inner oven door; 403. a front plenum housing; 404. a first vacuum ventilation system; 501. a second inner oven door; 502. a rear oven door; 503. a rear plenum housing; 504. a second vacuum ventilation system.
Detailed Description
The invention will be further described with reference to the following drawings and detailed description:
as shown in fig. 1-8, a multi-gas co-permeation strengthening system includes a feeding unit, a ventilation unit, a temperature-raising pre-permeation unit, a multi-gas co-permeation strengthening unit, a cooling protection unit and a discharging unit, which are connected in sequence;
the feeding unit comprises a feeding frame 1, a skip car travelling mechanism 2 arranged below the feeding frame 1 and a plurality of conveying rollers 3 which travel along the surface of the feeding frame 1 and penetrate through each unit;
the ventilation unit comprises a front ventilation chamber 4 arranged at the front part of the warming and pre-infiltrating unit and a rear ventilation chamber 5 arranged at the rear part of the cooling protection unit;
the heating and pre-infiltrating unit comprises a heating furnace, the front end and the rear end of the heating furnace are respectively provided with a sealed heat-insulating middle door 6 and a sealed heat-insulating middle door 7, a first explosion-proof port 8 arranged on the surface of the heating furnace is arranged at a position close to the heat-insulating middle door 6, the heating furnace comprises a shell 9, a first heat-insulating layer 10 arranged on the inner wall of the shell 9 and first heating elements 11 arranged at the upper end and the lower end in the shell 9, the surface of the shell 9 is connected with a first microwave generator 12, an infiltration promoting ball A is embedded in the surface of the first heat-insulating layer 10, the surface of the shell 9 is communicated with a plurality of fans 13, and thermocouples 14;
the multi-element gas co-permeation strengthening unit comprises a co-permeation chamber shell 15, the front end and the rear end of the co-permeation chamber shell 15 are respectively connected with a middle door 7 and a sealed middle door 16, a second explosion-proof port 17 is arranged at the position close to the sealed middle door 16, the surface of the co-permeation chamber shell 15 is connected with a second microwave generator 18, a second heat-insulating layer 19 is filled on the inner wall of the co-permeation chamber shell 15, a permeation promoting ball B is embedded on the surface of the second heat-insulating layer 19 and the bottom of the co-permeation chamber shell 15, a sliding rail 20 is arranged at the bottom of the second heat-insulating layer 19 along the extending direction, a pulley 21 is connected in the sliding rail 20 in a sliding manner, a connecting rod 23 is fixedly connected with the pulley through a connecting ring 22, a rack 25 meshed with a transmission gear 24 is laid on the surface of the connecting rod 23, a driven gear 26 arranged on the surface of the rack 25, the two ends of the coupler 28 are respectively provided with an eccentric rotary vane 29 with an opening deviating from each other, the surface of the rotary vane 29 is uniformly distributed with a plurality of second heating elements 30, the bottom of the link rod 23 is in threaded connection with a positioning seat 31, and the side part of the positioning seat 31 is provided with a micro motor 32 for driving the positioning seat to move along the surface of the link rod;
the cooling protection unit comprises a third inner furnace door 33 arranged at the rear end of the sealed middle door 16, a cooling chamber shell 34 is arranged between the sealed middle door 16 and the third inner furnace door 33, a heat insulation lining 35 is filled at the bottom of the cooling chamber shell 34, the surface of the cooling chamber shell 34 is connected with a shell-and-tube heat exchanger 36 through a pipeline, and the shell-and-tube heat exchanger 36 is respectively communicated with the heating furnace and the co-permeation chamber through pipelines;
the discharging unit comprises a discharging frame 37, a skip travelling mechanism 2 arranged below the discharging frame 37 and a plurality of conveying rollers 3 which travel along the surface of the discharging frame 37 and penetrate through each unit.
According to the invention, the feeding unit adopts the skip travelling mechanism 2 to drive the surface conveying roller 3 to travel, so that the long lamp rod piece is driven to be conveyed, and the conveying efficiency is improved. The ventilation unit is arranged at the front part of the warming pre-infiltration unit, and furnace gas ventilation treatment is carried out, so that the purity of the subsequent infiltration treatment atmosphere is ensured, the leakage of the front-end atmosphere is avoided, and the overall safety performance is improved. Surface pretreatment is carried out on the lamp post by utilizing the temperature-rising pre-infiltration unit, and CO is generated at the same time2As a catalyst for the soft nitriding treatment in the later period, the surface structure of the lamp post is softened in advance, so that the nitrogen element, the sulfur element and the chromium element can be conveniently infiltrated in the later period. The multi-element gas co-permeation strengthening unit slides along the axial direction of the slide rail 20 through the connecting rod 23, and meanwhile, the multi-element gas co-permeation strengthening unit is matched with the circular motion of the coupler 28, so that the heat of the second heating element is uniformly transferred, the ammonia atmosphere is uniformly dispersed, the thickness and the depth of a nitriding layer on the surface of the lamp pole piece tend to be consistent, the multi-element gas co-permeation strengthening unit is nitrided in advance by using the ammonia atmosphere, and then the sulfurization and the chromizing are realized by using the permeation promoting ball B, so that the surface permeating layer is compounded, and the surface corrosion resistance, the hardness and the like.
3 surperficial charging trays 38 of bearing lamp member of having laid of transfer roller, feeding frame 1 is equipped with grudging post 39 with the lateral part of taking a breath the unit junction, grudging post 39 upper portion is equipped with lamp pole inductor 40, and the surperficial embedded vertical servo module 41 that has, servo module 41 surface is equipped with the limiting plate 42 that blocks the work piece and march, limiting plate 42 bottom is equipped with and arranges the magnet 44 of the electro-magnet 43 looks actuation of feeding frame 1 below in. The lamp pole sensor 40 is used for accurately calculating the putting quantity of the lamp pole, so that the periodic processing of the lamp pole is realized, the orderly proceeding of the permeation process is ensured, and the attraction between the electromagnet 43 and the magnet 44 is used for realizing the freedom and the accuracy of the up-and-down movement of the servo module 41.
The front air exchange chamber 4 comprises a front furnace door 401 arranged at the front end, a first inner furnace door 402 arranged at the rear end and a front air exchange chamber shell 403 connecting the front furnace door 401 and the first inner furnace door 402, the conveying roller 3 enters from the front furnace door 401 and extends to the first inner furnace door 402 along the inside of the front air exchange chamber shell 403, and a first vacuum air exchange system 404 for promoting the inside of the front air exchange chamber shell 403 to be in a vacuum state is arranged on the surface of the front air exchange chamber shell 403. Utilize vacuum ventilation system 404 to extract the interior air of preceding scavenging air room 4, avoid the air to get into the rear end, influence follow-up nitriding, sulfurization and chromizing effect, simultaneously through setting up preceding scavenging air room 4, avoid lamp member spare heat treatment business turn over in and out the time toxic gas excessive, improve the feature of environmental protection.
The back air exchange chamber 5 comprises a second inner oven door 501 arranged at the back of the cooling protection unit, a back oven door 502 arranged at the tail end and a back air exchange chamber shell 503 connecting the second inner oven door 501 and the back oven door 502, the conveying roller 3 enters from the second inner oven door 501 and extends to the back oven door 502 along the inside of the back air exchange chamber shell 503, and the surface of the back air exchange chamber shell 503 is provided with a second vacuum air exchange system 504. Through setting up back scavenge chamber 5, when avoiding the lamp pole piece to carry to the rear end through transfer roller 3, toxic gas escapes, causes the problem of personnel's injury.
When the invention works, the lamp pole piece to be processed is overlapped and placed in the material tray 38, the first vacuum ventilation system 404 is started, the air in the front ventilation chamber 4 is extracted, the front ventilation chamber 4 is in a vacuum state, the skip car travelling mechanism 2 is started, the lamp pole piece is transmitted into the front ventilation chamber 4 through the transmission roller 3, the lamp pole piece sensor 40 emits laser, the total outer diameter sum of the lamp pole pieces is calculated according to the comparison between the laser return time and the blank return time, the number of the lamp pole pieces is calculated by using the historical data of the outer diameter of a single lamp pole piece, a signal is transmitted to the electromagnet 43, when a set value is reached, the vertical servo module 41 moves downwards, the bottom magnet 44 is attracted with the electromagnet 43, the limiting plate 42 is promoted to rapidly move downwards to block the transmission of the lamp pole piece, the throwing of the lamp pole piece is stopped, then the magnet 44 is repelled with the electromagnet 43, the limiting plate 42 moves upwards, the transmission, heating the heating element 11 of the temperature-rising pre-infiltration unit to a process temperature, simultaneously performing microwave radiation for 20min to oxidize fullerene in the infiltration promoting ball A into carbon dioxide, performing primary infiltration C treatment on the surface of the lamp post, forming a later-stage nitriding catalyst, opening the middle door 7, and allowing part of the carbon dioxide to enter a co-infiltration chamber; the micro motor 32 in the co-permeation chamber is driven to drive the positioning seat 31 to move downwards to the surface of the conveying roller 3 while the heating furnace is heated, the connecting rod 23 is driven to slide along the slide rail 20 along with the operation of the conveying roller 3, the rotary vane 29 is driven by the coupler 8 to rotate, the second heating element 30 on the surface of the rotary vane is heated to ensure that the temperature in the whole co-permeation chamber is uniform and consistent, the surface of the co-permeation chamber is provided with an air inlet pipeline, ammonia gas is introduced from the air inlet pipeline to uniformly diffuse ammonia gas to form stable and uniform ammonia gas atmosphere, after the process temperature is reached, the micro motor 32 is reversely started, the positioning seat 31 is driven by the micro motor 32 to move upwards along the connecting rod 23, the steering transmission shaft 27 is started to drive the driven gear 26 to rotate, the transmission gear 24 is driven to move along the rack 25 to integrally move upwards to the upper part, thereby facilitating the, gradually releasing the medium-state carbon-sulfur-chromium complex of the penetration promoting ball B, and performing microwave radiation for 30min to realize rapid vulcanization and chromizing so as to diversify the structure of a penetration layer; after multi-element co-permeation, the lamp rod pieces are conveyed to a cooling chamber through a conveying roller 3 to be cooled, and a shell-and-tube heat exchanger 36 absorbs waste heat and then transfers the heat to a front-end heating furnace and a co-permeation chamber, so that not only is energy effectively utilized, but also the loss of a heating element 11 is reduced; and then the lamp rod is conveyed into the rear ventilation chamber 5 extracted by the second vacuum ventilation system 504, further cooled and conveyed to the discharging frame 37 for collection and storage.
A multi-element gas co-permeation strengthening process comprises the following steps:
(1) after sand blasting is carried out on the lamp post to be processed, the lamp post to be processed is overlapped and placed in a material tray and is conveyed to each unit through a conveying roller;
(2) the lamp pole piece is conveyed into the front ventilation chamber by the conveying roller, the sensor of the lamp pole piece emits laser, the total outer diameter sum of the lamp pole pieces is calculated according to the comparison between the laser return time and the blank return time, the number of the lamp pole pieces is calculated by utilizing the historical data of the outer diameter of a single lamp pole piece, signals are transmitted to the electromagnet, when a set value is reached, the vertical servo module moves downwards, the bottom magnet is attracted with the electromagnet, the limiting plate is enabled to move downwards rapidly to block the conveying of the lamp pole pieces, the lamp pole pieces are stopped to be put in, then the magnet and the electromagnet repel each other, the limiting plate moves upwards, and;
(3) starting a first vacuum ventilation system to extract air from the front ventilation chamber, so as to avoid the air from participating in processing;
(4) when the temperature in the heating furnace reaches 400-460 ℃, the fullerene in the permeation promoting ball A is oxidized at high temperature to generate CO 2C permeation gas, meanwhile, the tufftriding is promoted, the lamp post is conveyed to the heating furnace by a conveying roller, and the microwave radiation is carried out for 20 min;
(5) when the temperature in the co-infiltration chamber rises to 470-570 ℃, introducing ammonia gas, performing heat preservation and microwave radiation for 30min, and then when the temperature rises to 570-590 ℃, gradually releasing gaseous carbon-sulfur-chromium complex in the permeation promoting ball B to form a mixed infiltration layer on the surface of the lamp post, wherein the tissue thickness reaches 20-50 um;
(6) conveying the permeated lamp pole piece into a cooling chamber shell by a conveying roller, filling nitrogen into the cooling chamber shell to protect the lamp pole piece, starting a fan to quickly reduce the temperature in the cooling chamber shell to be below 540 ℃, and then gradually cooling by air;
(7) starting a second vacuum ventilation system, carrying out air extraction on the rear ventilation chamber to enable the rear ventilation chamber to be in a vacuum state, and conveying the cooled lamp post to the rear ventilation chamber by using a conveying roller to prepare for discharging;
(8) and the lamp rod piece after the seepage layer is cooled is conveyed to a discharging frame by the conveying roller, and is collected and stored.
In the temperature-rising pre-infiltration unit of the invention,oxidation to CO using permeation-promoting ball A2Then the lamp pole is treated by the preliminary C infiltration, CO2 gas is transmitted to a multielement gas CO-infiltration strengthening unit, the ammonia nitriding process is catalyzed, nitriding, sulfurizing and chromizing processes are carried out in the multielement gas CO-infiltration strengthening unit, the input amount of ammonia is reduced due to the arrangement of the infiltration promoting ball B, the problem that black spots are generated on the surface of the lamp pole is avoided due to overhigh nitrogen potential at the initial stage, meanwhile, the multielement gas CO-infiltration is carried out, the infiltrated layer tissue of the lamp pole is compounded, the hardness and the corrosion resistance are obviously improved, and by the sectional infiltration mode, the multi-element competition infiltration during the multielement gas CO-infiltration is avoided, so that the infiltrated layer thickness is inconsistent, and the product quality is reduced.
The preparation method of the penetration-promoting ball A in the step (4) comprises the following steps: 1) dissolving a proper amount of oxide fibers and fullerene in a carbon tetrachloride solution, and soaking for 20-30 min; 2) taking out the soaked mixture and placing in CO2Cold drying in the atmosphere; 3) coating silica sol liquid on the surface of the mixture, vacuum-drying, and repeating for multiple times until the surface of the mixture is covered with a silica gel layer; 4) and (5) drying in an oven.
The invention arranges the penetration-promoting ball A in the temperature-rising pre-penetration unit to replace the direct introduction of CO2Avoid CO2The introduction amount of the multi-element gas co-permeation strengthening unit is not controllable in the later period.
The preparation method of the penetration-promoting ball B in the step (5) comprises the following steps: 1) dissolving potassium dichromate in concentrated sulfuric acid, adding deionized water for dilution, adding graphite, fully stirring, centrifuging, washing to be neutral, and preserving heat and drying to obtain expanded graphite; 2) adding silicon monoxide and expanded graphite into a phenolic resin solvent, dispersing, and pyrolyzing at high temperature to obtain an expanded graphite/silicon-silicon dioxide/carbon composite material; 3) filling the carbon-sulfur-chromium complex into the expanded graphite/silicon-silicon dioxide/carbon composite material, and performing high-temperature heat treatment to obtain the permeation-promoting ball B capable of slowly releasing the gaseous carbon-sulfur-chromium complex.
The penetration promoting ball B is arranged on the multi-element gas co-penetration strengthening unit to form a composite anticorrosive compound layer which takes the iron-nitrogen compound as a matrix and dissolves other atoms inside, so that the competitive penetration among multiple atoms is avoided, and the tissue quality of the penetrated layer of the lamp post is improved.
The gaseous carbon sulfur chromium complex is a combined complex formed by one or two of a carbon disulfide solution of chromium ammonium sulfate and a chromium ammonium sulfate formamide solution and chromium chloride.
Therefore, the invention is not to be limited to the specific embodiments, but rather, all equivalent changes and modifications in the shapes, structures, characteristics and spirit of the invention are intended to be included within the scope of the appended claims.
Claims (6)
1. A multi-element gas co-permeation strengthening system is characterized in that: comprises a feeding unit, a ventilation unit, a heating pre-permeation unit, a multi-element gas co-permeation strengthening unit, a cooling protection unit and a discharging unit which are connected in sequence;
the feeding unit comprises a feeding frame, a skip travelling mechanism arranged below the feeding frame and a plurality of conveying rollers which travel along the surface of the feeding frame and penetrate through each unit;
the air exchange unit comprises a front air exchange chamber arranged at the front part of the warming and pre-infiltrating unit and a rear air exchange chamber arranged at the rear part of the cooling protection unit;
the heating and pre-infiltrating unit comprises a heating furnace, the front end and the rear end of the heating furnace are respectively provided with a sealed heat-insulating middle door and a sealed heat-insulating middle door, a first explosion-proof port arranged on the surface of the heating furnace is arranged at a position close to the heat-insulating middle door, the heating furnace comprises a shell, a first heat-insulating layer arranged on the inner wall of the shell and first heating elements arranged at the upper end and the lower end in the shell, the surface of the shell is connected with a first microwave generator, a penetration promoting ball A is embedded on the surface of the first heat-insulating layer, the surface of the shell is communicated with a plurality of fans, and;
the preparation method of the penetration-promoting ball A comprises the following steps: 1) dissolving a proper amount of oxide fibers and fullerene in a carbon tetrachloride solution, and soaking for 20-30 min; 2) taking out the soaked mixture and placing in CO2Cold drying in the atmosphere; 3) coating silica sol liquid on the surface of the mixture, vacuum-drying, and repeating for multiple times until the surface of the mixture is covered with a silica gel layer; 4) drying by ovenDrying to obtain a penetration promoting ball A;
the multi-element gas co-permeation strengthening unit comprises a co-permeation chamber shell, the front end and the rear end of the co-permeation chamber shell are respectively connected with a middle door and a sealed middle door, a second explosion-proof opening is formed in the position close to the sealed middle door, the surface of the co-permeation chamber shell is connected with a second microwave generator, the inner wall of the co-permeation chamber shell is filled with a second heat insulation layer, a permeation promoting ball B is embedded in the surface of the second heat insulation layer and the bottom of the co-permeation chamber shell, a sliding rail is arranged at the bottom of the second heat insulation layer along the extending direction, a pulley is connected in the sliding rail in a sliding mode, a connecting rod is fixedly connected with the pulley through a connecting ring, a rack meshed with a transmission gear is laid on the surface of the connecting rod, a driven gear arranged on the surface of the rack is meshed at the bottom of the transmission gear, a steering transmission shaft, a plurality of second heating elements are uniformly distributed on the surface of the rotary vane, the bottom of the connecting rod is in threaded connection with a positioning seat, and a micro motor for driving the positioning seat to move along the surface of the connecting rod is arranged on the side part of the positioning seat;
the preparation method of the penetration-promoting ball B comprises the following steps: 1) dissolving potassium dichromate in concentrated sulfuric acid, adding deionized water for dilution, adding graphite, fully stirring, centrifuging, washing to be neutral, and preserving heat and drying to obtain expanded graphite; 2) adding silicon monoxide and expanded graphite into a phenolic resin solvent, dispersing, and pyrolyzing at high temperature to obtain an expanded graphite/silicon-silicon dioxide/carbon composite material; 3) filling the carbon-sulfur-chromium complex into an expanded graphite/silicon-silicon dioxide/carbon composite material, and performing high-temperature heat treatment to obtain a permeation promoting ball B capable of slowly releasing the gaseous carbon-sulfur-chromium complex;
the cooling protection unit comprises a third inner furnace door arranged at the rear end of the sealed middle door, a cooling chamber shell is arranged between the sealed middle door and the third inner furnace door, a heat insulation lining layer is filled at the bottom of the cooling chamber shell, the surface of the cooling chamber shell is connected with a shell-and-tube heat exchanger through a pipeline, and the shell-and-tube heat exchanger is respectively communicated with the heating furnace and the co-permeation chamber through pipelines;
the discharging unit comprises a discharging frame, a skip travelling mechanism arranged below the discharging frame, and a plurality of conveying rollers running through each unit and travelling along the surface of the discharging frame.
2. The multi-element gas co-permeation strengthening system according to claim 1, wherein: the utility model discloses a lamp pole piece, including conveyer roller, feeding frame, stand, servo module, limiting plate, magnet, stand, conveyer roller surface, the charging tray that bears the weight of the lamp pole piece has been laid on the conveyer roller surface, the feeding frame is equipped with the grudging post with the lateral part of taking a breath unit junction, grudging post upper portion is equipped with the lamp pole piece inductor, and the surperficial embedded vertical servo module that has, servo module surface is equipped with the limiting plate that blocks the work piece and march.
3. The multi-element gas co-permeation strengthening system according to claim 1, wherein: the front scavenging chamber comprises a front furnace door arranged at the front end, a first inner furnace door arranged at the tail end and a front scavenging chamber shell connected with the front furnace door and the first inner furnace door, the conveying roller enters from the front furnace door and extends to the first inner furnace door along the inside of the front scavenging chamber shell, and a first vacuum scavenging system for promoting the inside of the front scavenging chamber shell to be in a vacuum state is arranged on the surface of the front scavenging chamber shell.
4. The multi-element gas co-permeation strengthening system according to claim 1, wherein: the rear air exchange chamber comprises a second inner furnace door arranged at the rear part of the cooling protection unit, a rear furnace door arranged at the tail end and a rear air exchange chamber shell connected with the second inner furnace door and the rear furnace door, the conveying roller enters from the second inner furnace door and extends to the rear furnace door along the inner part of the rear air exchange chamber shell, and a second vacuum air exchange system is arranged on the surface of the rear air exchange chamber shell.
5. A multi-element gas co-permeation strengthening process is characterized in that: the method comprises the following steps: (1) after sand blasting is carried out on the lamp post to be processed, the lamp post to be processed is overlapped and placed in a material tray and is conveyed to each unit through a conveying roller;
(2) the lamp pole piece is conveyed into the front ventilation chamber by the conveying roller, the sensor of the lamp pole piece emits laser, the total outer diameter sum of the lamp pole pieces is calculated according to the comparison between the laser return time and the blank return time, the number of the lamp pole pieces is calculated by utilizing the historical data of the outer diameter of a single lamp pole piece, signals are transmitted to the electromagnet, when a set value is reached, the vertical servo module moves downwards, the bottom magnet is attracted with the electromagnet, the limiting plate is enabled to move downwards rapidly to block the conveying of the lamp pole pieces, the lamp pole pieces are stopped to be put in, then the magnet and the electromagnet repel each other, the limiting plate moves upwards, and;
(3) starting a first vacuum ventilation system to extract air from the front ventilation chamber, so as to avoid the air from participating in processing;
(4) when the temperature in the heating furnace reaches 400-460 ℃, the fullerene in the permeation promoting ball A is oxidized at high temperature to generate CO2C gas is permeated, meanwhile, tufftride is promoted, the lamp pole is conveyed to the heating furnace by the conveying roller, and microwave radiation is carried out for 20 min;
(5) when the temperature in the co-infiltration chamber rises to 470-570 ℃, introducing ammonia gas, performing heat preservation and microwave radiation for 30min, and then when the temperature rises to 570-590 ℃, gradually releasing gaseous carbon-sulfur-chromium complex in the permeation promoting ball B to form a mixed infiltration layer on the surface of the lamp post, wherein the tissue thickness reaches 20-50 um;
(6) conveying the permeated lamp pole piece into a cooling chamber shell by a conveying roller, filling nitrogen into the cooling chamber shell to protect the lamp pole piece, starting a fan to quickly reduce the temperature in the cooling chamber shell to be below 540 ℃, and then gradually cooling by air;
(7) starting a vacuum ventilation system, carrying out air extraction on a rear ventilation chamber to enable the rear ventilation chamber to be in a vacuum state, conveying the cooled lamp post to the rear ventilation chamber by a conveying roller, and preparing for discharging;
(8) and the lamp rod piece after the seepage layer is cooled is conveyed to a discharging frame by the conveying roller, and is collected and stored.
6. The multi-element gas co-permeation strengthening process according to claim 5, wherein: the gaseous carbon sulfur chromium complex is a combined complex formed by one or two of a carbon disulfide solution of chromium ammonium sulfate and a chromium ammonium sulfate formamide solution and chromium chloride.
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| CN110835722B (en) * | 2019-11-27 | 2023-08-25 | 特诺恩技术（天津）有限公司 | Sliding sealing furnace door for gear carburizing heat treatment |
| CN110906734B (en) * | 2019-11-28 | 2021-10-08 | 山东道普安制动材料有限公司 | Brake disc continuous siliconizing furnace and working method thereof |
| CN111172492B (en) * | 2020-01-03 | 2021-01-19 | 燕山大学 | Device and method for gear surface carburization |
| CN111850460A (en) * | 2020-07-24 | 2020-10-30 | 江苏良川科技发展有限公司 | Multi-gas co-permeation strengthening system and process thereof |
| CN111962016A (en) * | 2020-09-03 | 2020-11-20 | 江苏良川科技发展有限公司 | Preparation method of steel lamp pole |
| CN114774839B (en) * | 2021-10-15 | 2023-07-25 | 谢喜 | Heat treatment equipment for stainless electric cooker liner of iron casting and manufacturing method |
| CN117512500B (en) * | 2024-01-08 | 2024-03-26 | 江苏丰东热技术有限公司 | Carbonitriding heating device |
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