CN113046684A - Methanol engine timing chain pin shaft vanadinizing agent and vanadinizing process - Google Patents
Methanol engine timing chain pin shaft vanadinizing agent and vanadinizing process Download PDFInfo
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- CN113046684A CN113046684A CN202110168240.2A CN202110168240A CN113046684A CN 113046684 A CN113046684 A CN 113046684A CN 202110168240 A CN202110168240 A CN 202110168240A CN 113046684 A CN113046684 A CN 113046684A
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- pin shaft
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 21
- -1 rare earth iodide Chemical class 0.000 claims abstract description 19
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910000628 Ferrovanadium Inorganic materials 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 8
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims abstract description 8
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 238000005498 polishing Methods 0.000 claims abstract description 6
- 238000010791 quenching Methods 0.000 claims abstract description 6
- 230000000171 quenching effect Effects 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 239000002904 solvent Substances 0.000 claims abstract description 4
- 238000005496 tempering Methods 0.000 claims abstract description 4
- 230000003746 surface roughness Effects 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000001493 electron microscopy Methods 0.000 claims 1
- 238000005254 chromizing Methods 0.000 abstract description 9
- 239000010410 layer Substances 0.000 description 28
- 230000035515 penetration Effects 0.000 description 8
- 239000003961 penetration enhancing agent Substances 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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Classifications
-
- 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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
- C23C10/34—Embedding in a powder mixture, i.e. pack cementation
- C23C10/36—Embedding in a powder mixture, i.e. pack cementation only one element being diffused
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
-
- 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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/60—After-treatment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a vanadizing agent for a timing chain pin shaft of a methanol engine, which comprises ferrovanadium powder, aluminum oxide, aluminum powder and rare earth iodide, wherein the mass percentages of the components are respectively as follows: 40-60% of ferrovanadium powder, 30-40% of aluminum oxide, 3-5% of aluminum powder and 3-5% of rare earth iodide. A process for vanadinizing the timing chain pin of methanol engine includes such steps as removing rust from the surface of pin, adding solvent oil, stirring, adding vanadinizing agent, stirring, sealing, heating to T1 deg.C, filling nitrogen, evacuating impurities, heating to T2 deg.C, holding temp for 1 hr, cooling to T3 deg.C, cooling to T4 deg.C, cooling in cooling hood, cooling to room temp, quenching at T5 deg.C, tempering at T6 deg.C, and slow polishing for 96 hr or more. The good surface vanadizing layer is obtained by the vanadizing process, and the requirement on wear resistance under the condition of long mileage is met; the problem that the service life of a methanol engine for a commercial vehicle is influenced due to the low hardness and poor wear resistance of a chromizing layer in the prior art is solved.
Description
Technical Field
The invention relates to the field of automobile part manufacturing, in particular to a vanadinizing agent for a timing chain pin shaft of a methanol engine and a vanadinizing process.
Background
Due to the rapid development of the chain industry and the continuous improvement of the requirements of the parts on the performances of wear resistance, corrosion resistance, high temperature oxidation resistance and the like, the development of the surface strengthening process of the parts is promoted. Among them, the diffusion of metals into the surface of parts is developed and applied very rapidly. In order to meet the increasingly rapidly growing high requirements for the special properties of the material surface, a number of new methods for surface treatment have been developed, among which the methods of vanadizing, niodizing, button-and chromizing, etc., in a borax bath, developed by the central research in Toyota, Japan. The principle is diffusion method, which makes the surface of steel form the vanadizing layer of carbide, chromium solid solution and boride of the metal to be infiltrated.
The existing mature surface strengthening process is surface chromizing strengthening, and although the surface performance of chromizing parts is improved, the performance of a vanadizing layer is still poor and has a plurality of defects. Although the high-temperature oxidation resistance of the chromizing layer is good, the chromizing layer has low hardness and poor wear resistance, is easy to deeply peel off, and is only suitable for workpieces working under light load because a low-carbon area is easily formed under the chromizing layer of low-carbon steel and a medium-carbon steel.
The use of a timing chain in a methanol engine, particularly in a taxi or other commercial vehicle, poses a high challenge to the requirements of the chain on corrosion resistance, methanol resistance, formic acid resistance, wear resistance and the like, wherein the commercial vehicle generally has mileage exceeding 75 kilometers, so the requirement on wear resistance reaches unprecedented height, particularly the methanol engine running in the taxi carried under the commercial condition. The timing chain manufactured by the traditional chromizing process has poor corrosion resistance, alcohol resistance, acid resistance and wear resistance, cannot meet the use requirements under a methanol environment and a long-mileage condition of over 75 kilometres, and is easy to generate abnormal wear elongation and breakage of the chain, so that the service life of an engine is influenced.
Therefore, it is necessary to provide a vanadizing process that has good wear resistance and can increase the service life of methanol engines to solve the above technical problems.
Disclosure of Invention
In order to solve the technical problem, the invention provides a vanadinizing agent for a timing chain pin shaft of a methanol engine and a vanadinizing process. The problem that the service life of a methanol engine for a commercial vehicle is influenced due to the low hardness and poor wear resistance of a chromizing layer in the prior art is solved.
The technical effects of the invention are realized as follows:
a vanadinizing agent for a timing chain pin shaft of a methanol engine comprises ferrovanadium powder, aluminum oxide, aluminum powder and rare earth iodide, and the vanadinizing agent comprises the following components in percentage by mass: 40-60% of ferrovanadium powder, 30-40% of aluminum oxide, 3-5% of aluminum powder and 3-5% of rare earth iodide, wherein the rare earth iodide is used for promoting vanadization of the pin shaft. By using rare earth iodide as a penetration enhancer, rare earth chloride used as the penetration enhancer in the prior art is replaced, the surface penetration layer cracks of the pin shaft are reduced, the penetration layer thickness meeting the long-mileage requirement is achieved, the wear resistance of the pin shaft is improved, and the service life of the pin shaft is prolonged.
In addition, the process is realized based on the vanadizing agent, and comprises the following steps:
(1) removing rust on the surface of the pin shaft, adding solvent oil, fully stirring, adding the prepared vanadinizing agent, fully stirring, and sealing the tank;
(2) putting the sealed tank into a sealed furnace, heating to T1 ℃, filling nitrogen to evacuate impurity gas, heating to T2 ℃, preserving the heat for a preset time h1 hours, cooling to T3 ℃ along with the furnace, adding a cooling cover, forcibly cooling to T4 ℃, air-cooling to room temperature, and opening the furnace;
(3) quenching at T5 deg.C, tempering at T6 deg.C, and slowly polishing for 96 hr or more.
Further, in the step (1), the mass ratio of the vanadinizing agent to the pin roll is 1: 1.
further, in the step (2), when the heat preservation time is less than or equal to h1, the thickness of the vanadinizing layer on the surface of the pin shaft is in direct proportion to the heat preservation time.
Further, the quenching medium in the step (3) is water-based.
Further, the thickness of the vanadinizing layer on the surface of the pin shaft after the treatment of the vanadinizing process is more than or equal to 0.12 mm. The pin shaft is treated by the vanadinizing process, so that the thickness of the vanadinizing layer on the surface of the pin shaft is increased, the requirement on the long-distance running service life of the methanol engine under the operation condition is met, and the problem of chain abrasion, elongation or fracture is avoided.
Further, the surface hardness of the pin shaft after the treatment of the vanadinizing process is 2000-3600 HV 0.1. The pin shaft is treated by the vanadinizing process, so that the surface hardness of the pin shaft is greatly improved, and the wear resistance and the shearing resistance of the pin shaft are enhanced.
Further, the surface roughness of the pin shaft is less than Ra0.07 after the treatment of the vanadinizing process.
Furthermore, the surface of the pin shaft treated by the vanadizing process is free of pits which are peeled off and influence use under an optical microscope of 15 times. The pin shaft is treated by the vanadizing process, so that a vanadizing layer on the surface of the pin shaft is more uniform, the content of air holes and impurities is greatly reduced, and the pin shaft has better corrosion resistance.
Further, after the pin shaft is treated by the vanadizing process, the V + C weight ratio of the vanadized layer on the surface of the pin shaft is more than 95% through EDS test of an electron microscope.
As described above, the present invention has the following advantageous effects:
1) by using rare earth iodide as a penetration enhancer, rare earth chloride used as the penetration enhancer in the prior art is replaced, the surface penetration layer cracks of the pin shaft are reduced, the penetration layer thickness meeting the long-mileage requirement is achieved, the wear resistance of the pin shaft is improved, and the service life of the pin shaft is prolonged.
2) The pin shaft is processed by polishing at a low speed for more than or equal to 96 hours, so that a vanadium-impregnated layer on the surface of the pin shaft is more uniform, the content of air holes and impurities is greatly reduced, and the pin shaft has better corrosion resistance.
3) The pin shaft is treated by the vanadinizing process, so that the surface roughness of the pin shaft is less than Ra0.07, the surface roughness is low, and the wear resistance of the pin shaft is improved.
4) The pin shaft is treated by the vanadinizing process, so that the thickness of the vanadinizing layer on the surface of the pin shaft is increased, the requirement on the long-distance running service life of the methanol engine under the operation condition is met, and the problem of chain abrasion, elongation or fracture is avoided.
5) The pin shaft is treated by the vanadinizing process, so that the surface hardness of the pin shaft is greatly improved, and the wear resistance and the shearing resistance of the pin shaft are enhanced.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art it is also possible to derive other drawings from these drawings without inventive effort.
FIG. 1 is a flow chart of a vanadizing process according to an embodiment of the present application;
FIG. 2 is a graph of wear rate versus data for the 720h special endurance test.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1:
a vanadinizing agent for a timing chain pin shaft of a methanol engine comprises ferrovanadium powder, aluminum oxide, aluminum powder and rare earth iodide, and the vanadinizing agent comprises the following components in percentage by mass: 40-60% of ferrovanadium powder, 30-40% of aluminum oxide, 3-5% of aluminum powder and 3-5% of rare earth iodide, wherein the rare earth iodide is used for promoting vanadization of the pin shaft. By using rare earth iodide as a penetration enhancer, rare earth chloride used as the penetration enhancer in the prior art is replaced, the surface penetration layer cracks of the pin shaft are reduced, the penetration layer thickness meeting the long-mileage requirement is achieved, the wear resistance of the pin shaft is improved, and the service life of the pin shaft is prolonged.
Example 2:
as shown in fig. 1, a process for vanadinizing a timing chain pin shaft of a methanol engine is realized based on the vanadinizing agent in embodiment 1, and the process flow comprises the following steps:
s101, carrying out rust removal treatment on the pin shaft;
s102, adding solvent oil, and fully stirring (preventing the vanadinizing agent from being adhered to the pin shaft);
s103, mixing the vanadinizing agent and the pin shaft according to the mass ratio of 1: 1, adding the prepared vanadinizing agent, fully stirring for 6 times, sealing the tank and sealing;
s104, placing the sealed tank into a sealed furnace, heating to T1 ℃, filling nitrogen and exhausting impurity gas; the set value range of T1 is 180-200 ℃, and preferably 200 ℃.
S105, heating to T2 ℃, and preserving heat for 10 hours; the set value range of T2 is 950-1000 ℃, and preferably 970 ℃.
S106, cooling to T3 ℃ along with the furnace, adding a cooling cover, forcibly cooling to T4 ℃, air cooling to room temperature, and opening the furnace; the set value range of T3 is 750-800 ℃, preferably 780 ℃, and the set value range of T4 is 250-300 ℃, preferably 300 ℃.
S107, tempering for 3.5 hours at T6 ℃ after quenching at T5 ℃; the set value of T5 is 800-900 ℃, preferably 850 ℃, and the set value of T4 is 300-500 ℃, preferably 400 ℃.
And S108, polishing for 96 hours at a slow speed.
The steps S101-S103 are pin surface pretreatment processes; S104-S106 are vanadinizing treatment processes; and S107-S108 pin shaft cleaning process.
In this embodiment, the thickness of the vanadinizing layer in the step (5) is in direct proportion to the heat preservation time, and the heat preservation time needs to be controlled within a preset time, because when the heat preservation time exceeds the preset time, cracks appear in the vanadinizing layer, and the preset time is 12 hours.
In the embodiment, after the treatment of the vanadinizing process, the thickness of the vanadinizing layer on the surface of the pin shaft is more than or equal to 0.12mm, the surface hardness is 2000-3600 HV0.1, the surface roughness is less than Ra0.07, preferably less than or equal to Ra0.05, and the surface roughness has great influence on the service performance of mechanical parts. The surface roughness Ra means a small pitch and minute peak-valley unevenness of the worked surface, and the distance between two peaks or two valleys (pitch) thereof is small (below 1 mm) and is difficult to distinguish with the naked eye, so that it belongs to a microscopic geometric error. The smaller the surface roughness, the smoother the surface. The surface of the vanadium-doped surface has no pits which are peeled off and influence the use under an optical microscope of 15 times, and the V + C weight ratio of the vanadium-doped surface layer is more than 95 percent through EDS test of the electron microscope. The pin shaft is treated by the vanadinizing process, so that the thickness of the vanadinizing layer on the surface of the pin shaft is increased, the requirement on the long-distance running service life of the methanol engine under the operation condition is met, and the problem of chain abrasion, elongation or fracture is avoided. The pin shaft is treated by the vanadinizing process, so that the surface hardness of the pin shaft is greatly improved, and the wear resistance and scratch resistance of the pin shaft are enhanced. The pin shaft is treated by the vanadizing process, so that a vanadizing layer on the surface of the pin shaft is more uniform, the content of air holes and impurities is greatly reduced, and the pin shaft has better corrosion resistance.
Compared with the prior art, the invention has the advantages that the pin shaft treated by the vanadinizing process has stronger wear resistance compared with the pin shaft treated by the vanadinizing process commonly used in the industry at present as shown in figure 1.
As described above, the present invention has the following advantageous effects:
1) by using rare earth iodide as a penetration enhancer, rare earth chloride used as the penetration enhancer in the prior art is replaced, the surface penetration layer cracks of the pin shaft are reduced, the penetration layer thickness meeting the long-mileage requirement is achieved, the wear resistance of the pin shaft is improved, and the service life of the pin shaft is prolonged.
2) The pin shaft is processed by polishing at a low speed for more than or equal to 96 hours, so that a vanadium-impregnated layer on the surface of the pin shaft is more uniform, the content of air holes and impurities is greatly reduced, and the pin shaft has better corrosion resistance.
3) The pin shaft is treated by the vanadinizing process, so that the surface roughness of the pin shaft is less than Ra0.07, the surface roughness is low, and the wear resistance of the pin shaft is improved.
4) The pin shaft is treated by the vanadinizing process, so that the thickness of the vanadinizing layer on the surface of the pin shaft is increased, the requirement on the long-distance running service life of the methanol engine under the operation condition is met, and the problem of chain abrasion, elongation or fracture is avoided.
5) The pin shaft is treated by the vanadinizing process, so that the surface hardness of the pin shaft is greatly improved, and the wear resistance and the shearing resistance of the pin shaft are enhanced. The invention is not limited to the process parameters in the above embodiments, and how to adjust the process parameters will fall within the scope of the invention.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. The vanadizing agent for the timing chain pin shaft of the methanol engine is characterized by comprising ferrovanadium powder, aluminum oxide, aluminum powder and rare earth iodide, wherein the mass percentages of the components are as follows: 40-60% of ferrovanadium powder, 30-40% of aluminum oxide, 3-5% of aluminum powder and 3-5% of rare earth iodide, wherein the rare earth iodide is used for promoting vanadization of the pin shaft.
2. A process for vanadinizing a timing chain pin shaft of a methanol engine, which is realized based on the vanadinizing agent of claim 1, is characterized by comprising the following steps:
(1) removing rust on the surface of the pin shaft, adding solvent oil, fully stirring, adding the prepared vanadinizing agent, fully stirring, and sealing the tank;
(2) putting the sealed tank into a sealed furnace, heating to T1 ℃, filling nitrogen to evacuate impurity gas, heating to T2 ℃, preserving the heat for a preset time h1 hours, cooling to T3 ℃ along with the furnace, adding a cooling cover, forcibly cooling to T4 ℃, air-cooling to room temperature, and opening the furnace;
(3) quenching at T5 deg.C, tempering at T6 deg.C, and slowly polishing for 96 hr or more.
3. The process of claim 2, wherein the mass ratio of the vanadizing agent to the pin shaft in the step (1) is 1: 1.
4. the process of claim 2, wherein in the step (2), when the heat preservation time is less than or equal to h1, the thickness of the vanadized layer on the surface of the pin shaft is in direct proportion to the heat preservation time.
5. The process of claim 2, wherein the quenching medium in step (3) is water-based.
6. The process of claim 2, wherein the thickness of the vanadizing layer on the surface of the pin shaft is greater than or equal to 0.12mm after the vanadizing treatment.
7. The process of claim 2, wherein the surface hardness of the pin shaft after the vanadizing treatment is 2000-3600 HV 0.1.
8. The process of claim 2, wherein the surface roughness of the pin shaft is less than Ra0.07 after the treatment of the vanadizing process.
9. The process of claim 2, wherein the surface of the pin is free of pits which are peeled off and affect use under an optical microscope of 15 times.
10. The process of claim 2, wherein the vanadizing layer on the surface of the pin shaft after the vanadizing treatment is 95% or more in V + C weight ratio as measured by electron microscopy EDS.
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| CN202110168240.2A CN113046684B (en) | 2021-02-07 | 2021-02-07 | Methanol engine timing chain pin shaft vanadinizing agent and vanadinizing process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114836596A (en) * | 2022-04-22 | 2022-08-02 | 辽宁工业大学 | Powder vanadinizing agent and laser remelting composite vanadinizing strengthening method for tool and die cutter |
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|---|---|---|---|---|
| CN101033554A (en) * | 2007-04-19 | 2007-09-12 | 宣碧华 | High-carbon steel pin roll vanadizing composite treatment process |
| CN105239037A (en) * | 2015-11-02 | 2016-01-13 | 杭州持正科技股份有限公司 | Chain pin shaft surface vanadinizing strengthening process |
| CN109468581A (en) * | 2018-11-26 | 2019-03-15 | 广东省新材料研究所 | A kind of solid powder multiple elements design penetration enhancer and compound cementation process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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