CN112941272B - High-pressure oil pump plunger coupling piece with good dimensional stability and preparation method thereof - Google Patents
High-pressure oil pump plunger coupling piece with good dimensional stability and preparation method thereof Download PDFInfo
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- CN112941272B CN112941272B CN202110121541.XA CN202110121541A CN112941272B CN 112941272 B CN112941272 B CN 112941272B CN 202110121541 A CN202110121541 A CN 202110121541A CN 112941272 B CN112941272 B CN 112941272B
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- 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
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- 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
- C21D1/04—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering with simultaneous application of supersonic waves, magnetic or electric fields
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- 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
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/50—Oil baths
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- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/58—Oils
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- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
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- 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
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention provides a high-pressure oil pump plunger coupling piece with good dimensional stability and a preparation method thereof, wherein W6Mo5Cr4V2 high-speed steel is adopted as a raw material, tempering treatment is carried out in a high-magnetic field environment after specific salt bath and oil bath treatment, the chemical components on the surface of the plunger coupling piece are improved, so that the mechanical strength is improved, the internal metal crystal phase is changed, the purpose of reducing the high-temperature expansion coefficient is achieved, and the corresponding plunger coupling piece can still keep good surface performance and size after long-term working under the high-temperature condition, so that the frictional wear is reduced, the service life is prolonged, and the high-pressure oil pump plunger coupling piece has a good application prospect.
Description
Technical Field
The invention relates to the technical field of high-pressure oil pump equipment, in particular to a high-pressure oil pump plunger coupling piece with good dimensional stability and a preparation method thereof.
Background
The plunger and the plunger sleeve are a pile of precise coupling parts, the clearance is extremely small, the plunger and the plunger sleeve can be matched after being ground and matched and cannot be replaced mutually, the plunger is used for circulating oil supply of an engine, the plunger is driven by a cam to axially reciprocate in the working process, and the inclined groove at the end part and the central oil duct are selectively communicated with an oil inlet and return hole in the reciprocating process to realize the purpose of circulating oil supply.
Under high-speed reciprocating motion, the continuous friction between plunger and the plunger sleeve produces heat, and the plunger can expand because of being heated, thereby increase and the plunger sleeve between the frictional force, accelerate the wearing and tearing of plunger, plunger itself also can accelerate the friction loss of plunger self under high-speed reciprocating motion simultaneously, influence its life, generally adopt GCr15 bearing steel as the material of plunger among the prior art, GCr15 bearing steel has very good wearability and stand wear and tear fatigue strength, but the introduction of non-metallic debris can greatly influence its performance, simultaneously because work under the high temperature condition for a long time, work piece self need carry out direct contact with the oil that has certain corrosivity for a long time, consequently very easily lead to its surface properties to change, influence the dimensional stability of work piece, finally lead to wearing and tearing.
Disclosure of Invention
In view of this, the present invention provides a high-pressure oil pump plunger coupling capable of effectively improving dimensional stability and a method for manufacturing the same.
The technical scheme of the invention is realized as follows: the invention provides a preparation method of a high-pressure oil pump plunger coupling piece with good dimensional stability, which comprises the following steps:
firstly, machining a W6Mo5Cr4V2 high-speed steel bar according to the size requirement to obtain a crude plunger coupling piece;
Step two, soaking the crude plunger coupling part in absolute ethyl alcohol, performing ultrasonic cleaning treatment for 10-20min, and performing air drying in a nitrogen atmosphere after the treatment is finished;
thirdly, placing the crude plunger coupling part air-dried in the second step into a box-type furnace, heating to 400 ℃ for heat preservation treatment for 2-5min, heating to 900 ℃ for heat preservation treatment for 1-2min, transferring the crude plunger coupling part into a salt bath furnace, heating to 1250 ℃ for heat preservation treatment for 5-10min, after finishing heat preservation, placing the crude plunger coupling part into quenching oil for quenching treatment for 5-10s to obtain the crude plunger coupling part after quenching;
and step four, soaking the quenched crude plunger coupling piece in absolute ethyl alcohol for ultrasonic cleaning treatment for 10-20min, air-drying in a nitrogen atmosphere after the treatment is finished, then placing the air-dried crude plunger coupling piece in a vacuum heating furnace for tempering treatment, adding a magnetic field at the position of the crude plunger coupling piece during the tempering treatment, finishing the tempering treatment, and demagnetizing to obtain a finished plunger coupling piece.
On the basis of the technical scheme, preferably, the quenching oil comprises 70-90 parts of base oil, 2-6 parts of cooling catalyst, 1-2 parts of brightener and 1-4 parts of antioxidant by mass.
Based on the above technical scheme, preferably, the base oil is 250N or 500N base oil.
On the basis of the technical scheme, preferably, the cooling accelerator is polyisobutylene, the brightening agent is petroleum sulfonate, and the antioxidant is p-methylphenol.
Still more preferably, in the third step, the salt bath used in the salt bath furnace includes, by mass, 5 to 8 parts of lithium carbonate, 72 to 85 parts of sodium nitrate, and 2 to 5 parts of sodium hydroxide.
On the basis of the above technical scheme, preferably, in the fourth step, argon is flushed into the vacuum heating furnace as a protective atmosphere during operation.
On the basis of the above technical solution, preferably, in step four, the tempering treatment includes the following steps:
step one, heating a vacuum heating furnace to 250-300 ℃, adjusting the magnetic field intensity at the position of the crude product of the plunger coupling part to be 2-5T, carrying out heating treatment for 50-70min, taking out and air-cooling to room temperature;
secondly, putting the plunger coupling part after air cooling in the first step into a vacuum heating furnace again, heating the vacuum heating furnace to 450-500 ℃, adjusting the magnetic field intensity at the position of the crude product of the plunger coupling part to be 4-8T, carrying out heating treatment for 50-70min, and taking out and air cooling to room temperature;
and thirdly, demagnetizing the plunger coupling piece obtained in the second step to obtain the plunger coupling piece.
On the basis of the above technical scheme, preferably, the first step can be repeated for 2 times.
On the basis of the above technical scheme, preferably, the second step can be repeated for 2 times.
The invention also provides a plunger coupling part prepared by the preparation method.
Compared with the prior art, the high-pressure oil pump plunger coupling piece with good dimensional stability and the preparation method have the following beneficial effects:
(1) the invention adopts W6Mo5Cr4V2 high-speed steel to replace the prior GCr15 bearing steel, simultaneously adopts specific quenching oil to carry out quenching treatment in the processing treatment process, so that the surface hardness of the bearing steel is higher, and before carrying out oil bath, salt bath treatment is carried out through a salt bath furnace, so that trace sodium, lithium and nitrogen are permeated into the surface of the bearing steel, and the mechanical property is enhanced;
(2) furthermore, the invention also adopts a specific tempering process, adds a magnetic field for auxiliary treatment in the tempering process, improves the internal metal crystalline phase structure, achieves the purpose of improving the high-temperature dimensional stability, and prevents the expansion of the steel plate when the steel plate works in a high-temperature environment, thereby increasing the friction and accelerating the abrasion;
(3) the plunger coupling piece prepared by the preparation method has good high-temperature dimensional stability and mechanical strength, can better adapt to the working environment of the plunger in the high-pressure oil pump, and has good application prospect.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.
Preparing quenching oil:
weighing 7kg of 250N base oil, 200g of polyisobutene, 100g of petroleum sulfonate and 100g of p-methylphenol, mixing and uniformly stirring to obtain the quenching oil.
Salt bath for preparing salt bath furnace:
5kg of lithium carbonate, 72kg of sodium nitrate and 2kg of sodium hydroxide are respectively weighed, uniformly mixed and heated to be molten to obtain a salt bath.
Preparation of the plunger coupling piece:
machining a W6Mo5Cr4V2 high-speed steel bar according to the size requirement to obtain a plunger coupling piece crude product, soaking the crude product in absolute ethyl alcohol for ultrasonic cleaning, wherein the cleaning treatment time is 10min, taking out the plunger coupling piece crude product after the treatment is finished, drying the plunger coupling piece crude product in nitrogen atmosphere, placing the dried plunger coupling piece crude product in a box-type furnace, heating to 300 ℃, performing heat preservation treatment for 2min, then heating to 800 ℃, performing heat preservation for 1min, quickly transferring the plunger coupling piece crude product into a salt bath furnace, heating to 1200 ℃, performing heat preservation treatment for 5min, performing heat preservation, placing the plunger coupling piece crude product in quenching oil for quenching treatment for 5s to obtain a quenched plunger coupling piece crude product, soaking the quenched plunger coupling piece crude product in absolute ethyl alcohol for ultrasonic cleaning for 10min, performing air drying in nitrogen atmosphere after the cleaning is finished, placing the air-dried plunger coupling piece in a vacuum heating furnace, keeping the atmosphere of argon in the vacuum heating furnace, meanwhile, the position of the crude plunger coupling piece has the magnetic field intensity of 2T, the temperature is raised to 250 ℃, the heating treatment is carried out for 50min, and after the heating is finished, the crude plunger coupling piece is taken out and then is air-cooled to the room temperature in the nitrogen atmosphere; and after air cooling, transferring the crude plunger coupling piece into a vacuum heating furnace, keeping the atmosphere in the vacuum heating furnace at argon gas, simultaneously enabling the crude plunger coupling piece to have a magnetic field intensity of 4T at the position, heating to 450 ℃, carrying out heating treatment for 50min, after heating, taking out, carrying out air cooling to room temperature in a nitrogen atmosphere, and removing magnetism attached to the crude plunger coupling piece by adopting alternating current demagnetization to obtain a finished plunger coupling piece.
Example 2
Preparing quenching oil:
weighing 7.5kg of 250N base oil, 300g of polyisobutylene, 200g of petroleum sulfonate and 200g of p-methyl phenol, mixing and uniformly stirring to obtain the quenching oil.
Salt bath for salt bath preparation:
6kg of lithium carbonate, 75kg of sodium nitrate and 3kg of sodium hydroxide are respectively weighed, mixed uniformly and heated to be molten to obtain a salt bath.
Preparation of the plunger coupling piece:
machining a W6Mo5Cr4V2 high-speed steel bar according to the size requirement to obtain a crude plunger coupling piece, soaking the crude plunger coupling piece in absolute ethyl alcohol for ultrasonic cleaning, wherein the cleaning treatment time is 12min, taking out the crude plunger coupling piece after the treatment is finished, drying the crude plunger coupling piece in nitrogen atmosphere, placing the dried crude plunger coupling piece in a box-type furnace, heating to 320 ℃, performing heat preservation treatment for 3min, then heating to 820 ℃, performing heat preservation for 2min, quickly transferring the crude plunger coupling piece into a salt bath furnace, heating to 1210 ℃, performing heat preservation treatment for 6min, performing heat preservation, placing the crude plunger coupling piece in quenching oil for quenching treatment for 6s to obtain a quenched crude plunger coupling piece, soaking the quenched crude plunger coupling piece in absolute ethyl alcohol for ultrasonic cleaning for 12min, performing air drying in nitrogen atmosphere after the cleaning is finished, placing the air-dried crude plunger coupling piece in a vacuum heating furnace, keeping the atmosphere of argon in the vacuum heating furnace, meanwhile, the crude plunger coupling piece is located at a position with a magnetic field intensity of 3T, the temperature is raised to 260 ℃, the heating treatment is carried out for 55min, and after the heating is finished, the crude plunger coupling piece is taken out and then is air-cooled to the room temperature in a nitrogen atmosphere; and after air cooling, transferring the crude plunger coupling piece into a vacuum heating furnace, keeping the atmosphere in the vacuum heating furnace at argon gas, simultaneously keeping the crude plunger coupling piece at a position with a magnetic field intensity of 5T, heating to 460 ℃, performing heating treatment for 55min, after heating, taking out, performing air cooling to room temperature in a nitrogen atmosphere, and removing magnetism attached to the plunger coupling piece by adopting alternating current demagnetization to obtain a finished plunger coupling piece.
Example 3
Preparing quenching oil:
8kg of 250N base oil, 400g of polyisobutylene, 100g of petroleum sulfonate and 300g of p-methyl phenol are weighed, mixed and stirred uniformly to obtain the quenching oil.
Salt bath for preparing salt bath furnace:
weighing 7kg of lithium carbonate, 78kg of sodium nitrate and 4kg of sodium hydroxide respectively, uniformly mixing, and heating until the mixture is molten to obtain a salt bath.
Preparation of the plunger coupling piece:
machining a W6Mo5Cr4V2 high-speed steel bar according to the size requirement to obtain a plunger coupling piece crude product, soaking the crude product in absolute ethyl alcohol for ultrasonic cleaning, wherein the cleaning treatment time is 14min, taking out the plunger coupling piece crude product after the treatment is finished, drying the plunger coupling piece crude product in nitrogen atmosphere, placing the dried plunger coupling piece crude product in a box-type furnace, heating to 340 ℃, performing heat preservation treatment for 4min, then heating to 840 ℃, performing heat preservation for 1min, then quickly transferring the plunger coupling piece crude product into a salt bath furnace, heating to 1220 ℃, performing heat preservation treatment for 7min, finishing the heat preservation, placing the plunger coupling piece crude product in quenching oil for quenching treatment for 7s to obtain a quenched plunger coupling piece crude product, soaking the quenched plunger coupling piece crude product in absolute ethyl alcohol for ultrasonic cleaning for 14min, drying in nitrogen atmosphere after the cleaning is finished, placing the air-dried plunger coupling piece in a vacuum heating furnace, keeping the atmosphere of argon in the vacuum heating furnace, meanwhile, the crude plunger coupling piece is located with a 4T magnetic field intensity, the temperature is increased to 270 ℃, the heating treatment is carried out for 60min, and after the heating is finished, the crude plunger coupling piece is taken out and then is air-cooled to the room temperature in the nitrogen atmosphere; and after air cooling, transferring the crude plunger coupling piece into a vacuum heating furnace, keeping the atmosphere in the vacuum heating furnace at argon gas, simultaneously enabling the crude plunger coupling piece to have a magnetic field intensity of 6T at the position, heating to 470 ℃, carrying out heating treatment for 60min, after heating, taking out, carrying out air cooling to room temperature in a nitrogen atmosphere, and removing magnetism attached to the crude plunger coupling piece by adopting alternating current demagnetization to obtain a finished plunger coupling piece.
Example 4
Preparing quenching oil:
8.5kg of 250N base oil, 500g of polyisobutylene, 200g of petroleum sulfonate and 400g of p-methyl phenol are weighed, mixed and stirred uniformly to obtain the quenching oil.
Salt bath for salt bath preparation:
8kg of lithium carbonate, 82kg of sodium nitrate and 5kg of sodium hydroxide are respectively weighed, uniformly mixed and heated to be molten to obtain a salt bath.
Preparation of the plunger coupling piece:
machining a W6Mo5Cr4V2 high-speed steel bar according to the size requirement to obtain a crude plunger coupling piece, soaking the crude plunger coupling piece in absolute ethyl alcohol for ultrasonic cleaning, wherein the cleaning treatment time is 17min, taking out the crude plunger coupling piece after the treatment is finished, drying the crude plunger coupling piece in nitrogen atmosphere, placing the dried crude plunger coupling piece in a box-type furnace, heating to 370 ℃, carrying out heat preservation treatment for 5min, then heating to 870 ℃, carrying out heat preservation for 2min, rapidly transferring the crude plunger coupling piece into a salt bath furnace, heating to 1240 ℃, carrying out heat preservation treatment for 8min, carrying out heat preservation, placing the crude plunger coupling piece in quenching oil for quenching treatment for 8s to obtain a quenched crude plunger coupling piece, soaking the quenched crude plunger coupling piece in absolute ethyl alcohol for ultrasonic cleaning for 17min, carrying out air drying in nitrogen atmosphere after the cleaning is finished, placing the air-dried crude plunger coupling piece in a vacuum heating furnace, keeping the atmosphere of argon in the vacuum heating furnace, meanwhile, the crude plunger coupling piece is located with a magnetic field intensity of 5T, the temperature is increased to 270 ℃, the heating treatment is carried out for 65min, and after the heating is finished, the crude plunger coupling piece is taken out and then is air-cooled to the room temperature in the nitrogen atmosphere; and after air cooling, transferring the crude plunger coupling piece into a vacuum heating furnace, keeping the atmosphere in the vacuum heating furnace at argon gas, simultaneously enabling the crude plunger coupling piece to have a magnetic field intensity of 7T at the position, heating to 480 ℃, carrying out heating treatment for 65min, after heating, taking out, carrying out air cooling to room temperature in a nitrogen atmosphere, and removing magnetism attached to the crude plunger coupling piece by adopting alternating current demagnetization to obtain a finished plunger coupling piece.
Example 5
Preparing quenching oil:
9kg of 250N base oil, 600g of polyisobutylene, 100g of petroleum sulfonate and 400g of p-methyl phenol are weighed, mixed and stirred uniformly to obtain the quenching oil.
Salt bath for preparing salt bath furnace:
weighing 7kg of lithium carbonate, 85kg of sodium nitrate and 4kg of sodium hydroxide respectively, uniformly mixing, and heating until the mixture is molten to obtain a salt bath.
Preparation of the plunger coupling piece:
machining a W6Mo5Cr4V2 high-speed steel bar according to the size requirement to obtain a crude plunger coupling piece, soaking the crude plunger coupling piece in absolute ethyl alcohol for ultrasonic cleaning, wherein the cleaning treatment time is 20min, taking out the crude plunger coupling piece after the treatment is finished, drying the crude plunger coupling piece in nitrogen atmosphere, placing the dried crude plunger coupling piece in a box-type furnace, heating to 400 ℃, performing heat preservation treatment for 5min, then heating to 900 ℃, performing heat preservation for 1min, then quickly transferring the crude plunger coupling piece into a salt bath furnace, heating to 1250 ℃, performing heat preservation treatment for 10min, after the heat preservation is finished, placing the crude plunger coupling piece in quenching oil for quenching treatment for 10s to obtain a quenched crude plunger coupling piece, soaking the quenched crude plunger coupling piece in absolute ethyl alcohol for ultrasonic cleaning for 20min, performing air drying in nitrogen atmosphere after the cleaning is finished, placing the air-dried crude plunger coupling piece in a vacuum heating furnace, keeping the atmosphere of argon in the vacuum heating furnace, meanwhile, the crude plunger coupling piece is located with a magnetic field intensity of 4T, the temperature is raised to 300 ℃, the heating treatment is carried out for 70min, and after the heating is finished, the crude plunger coupling piece is taken out and then is air-cooled to the room temperature in the nitrogen atmosphere; and after air cooling, transferring the crude plunger coupling piece into a vacuum heating furnace, keeping the atmosphere in the vacuum heating furnace at argon gas, simultaneously enabling the crude plunger coupling piece to have the magnetic field intensity of 8T at the position, heating to 500 ℃, carrying out heating treatment for 70min, after heating, taking out, carrying out air cooling to room temperature in the nitrogen atmosphere, and removing magnetism attached to the crude plunger coupling piece by adopting alternating current demagnetization to obtain the finished plunger coupling piece.
Comparative example
The resulting plunger coupling was prepared using GCr15 bearing steel.
The plunger couplings obtained in examples 1 to 5 and the comparative example were subjected to the mechanical property test related to dimensional stability, the test items include hardness and thermal dimensional stability tests, and the test results are as follows:
compared with the plunger coupling piece prepared from GCr15 bearing steel, the high-pressure oil pump plunger coupling piece prepared by the preparation method disclosed by the invention has better mechanical properties and better dimensional stability at high temperature.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A preparation method of a high-pressure oil pump plunger coupling piece with good dimensional stability is characterized by comprising the following steps:
firstly, machining a W6Mo5Cr4V2 high-speed steel bar according to the size requirement to obtain a crude plunger coupling piece;
soaking the crude plunger coupling piece in absolute ethyl alcohol, performing ultrasonic cleaning treatment for 10-20min, and drying in a nitrogen atmosphere after the treatment is finished;
thirdly, placing the crude plunger coupling part air-dried in the second step into a box-type furnace, heating to 400 ℃ for heat preservation treatment for 2-5min, heating to 900 ℃ for heat preservation treatment for 1-2min, transferring the crude plunger coupling part into a salt bath furnace, heating to 1250 ℃ for heat preservation treatment for 5-10min, after finishing heat preservation, placing the crude plunger coupling part into quenching oil for quenching treatment for 5-10s to obtain the crude plunger coupling part after quenching;
And step four, soaking the quenched crude plunger coupling piece in absolute ethyl alcohol for ultrasonic cleaning for 10-20min, drying the quenched crude plunger coupling piece in nitrogen atmosphere after the treatment is finished, then placing the dried crude plunger coupling piece in a vacuum heating furnace for tempering treatment, adding a magnetic field at the position of the crude plunger coupling piece during the tempering treatment, finishing the tempering treatment, and demagnetizing to obtain a finished plunger coupling piece.
2. The method of claim 1 wherein said quenching oil comprises 7kg of 250N base oil, 200g of polyisobutylene, 100g of petroleum sulfonate and 100g of p-methyl phenol in parts by weight.
3. The method for preparing a high-pressure oil pump plunger coupling piece with good dimensional stability according to claim 1, wherein in step three, the salt bath used in the salt bath furnace comprises, by mass, 5-8 parts of lithium carbonate, 72-85 parts of sodium nitrate and 2-5 parts of sodium hydroxide.
4. The method for manufacturing a high-pressure oil pump plunger coupling with good dimensional stability as set forth in claim 1, wherein in the fourth step, the vacuum heating furnace is flushed with argon gas as a protective atmosphere during operation.
5. The method for manufacturing a high-pressure oil pump plunger coupling with good dimensional stability as set forth in claim 1, wherein in the fourth step, the tempering treatment comprises the steps of:
Step one, heating a vacuum heating furnace to 250-300 ℃, adjusting the magnetic field intensity at the position of the crude product of the plunger coupling part to be 2-5T, carrying out heating treatment for 50-70min, taking out and air-cooling to room temperature;
secondly, putting the plunger coupling part after air cooling in the first step into a vacuum heating furnace again, heating the vacuum heating furnace to 450-500 ℃, adjusting the magnetic field intensity at the position of the crude product of the plunger coupling part to be 4-8T, carrying out heating treatment for 50-70min, and taking out and air cooling to room temperature;
and thirdly, demagnetizing the plunger coupling piece obtained in the second step to obtain the plunger coupling piece.
6. The method of claim 5 wherein said steps are repeated 2 times.
7. The method for manufacturing a high-pressure oil pump plunger coupling with good dimensional stability as set forth in claim 5, wherein the second step is repeated 2 times.
8. The plunger coupling piece prepared by the method for preparing the high-pressure oil pump plunger coupling piece with good dimensional stability as claimed in any one of claims 1 to 7.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5837117A (en) * | 1981-08-27 | 1983-03-04 | High Frequency Heattreat Co Ltd | Quenching method in liquid and its device |
| JP2002003989A (en) * | 2000-06-27 | 2002-01-09 | Nippon Koshuha Steel Co Ltd | High wear resistant alloy steel and its manufacturing method |
| CN101126387A (en) * | 2007-09-07 | 2008-02-20 | 无锡鹰贝机械有限公司 | Production process of high-purity plunger piston |
| CN101838774A (en) * | 2010-05-10 | 2010-09-22 | 金文平 | High speed steel and productive technology thereof |
| JP2011027056A (en) * | 2009-07-28 | 2011-02-10 | Daishin Seiki Kk | Pump for high pressure washer |
| CN102329940A (en) * | 2011-09-13 | 2012-01-25 | 龙工（上海）桥箱有限公司 | Thermal treatment process for plunger of axial plunger pump |
| CN102534385A (en) * | 2012-02-16 | 2012-07-04 | 无锡市万邦机械制造厂 | Method for manufacturing plunger by processing and forming GCr15 steel material |
| CN109439856A (en) * | 2018-11-16 | 2019-03-08 | 中国航发西安动力控制科技有限公司 | It can be improved the heat treatment process of 50CrVA plunger spring fatigue strength |
-
2021
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5837117A (en) * | 1981-08-27 | 1983-03-04 | High Frequency Heattreat Co Ltd | Quenching method in liquid and its device |
| JP2002003989A (en) * | 2000-06-27 | 2002-01-09 | Nippon Koshuha Steel Co Ltd | High wear resistant alloy steel and its manufacturing method |
| CN101126387A (en) * | 2007-09-07 | 2008-02-20 | 无锡鹰贝机械有限公司 | Production process of high-purity plunger piston |
| JP2011027056A (en) * | 2009-07-28 | 2011-02-10 | Daishin Seiki Kk | Pump for high pressure washer |
| CN101838774A (en) * | 2010-05-10 | 2010-09-22 | 金文平 | High speed steel and productive technology thereof |
| CN102329940A (en) * | 2011-09-13 | 2012-01-25 | 龙工（上海）桥箱有限公司 | Thermal treatment process for plunger of axial plunger pump |
| CN102534385A (en) * | 2012-02-16 | 2012-07-04 | 无锡市万邦机械制造厂 | Method for manufacturing plunger by processing and forming GCr15 steel material |
| CN109439856A (en) * | 2018-11-16 | 2019-03-08 | 中国航发西安动力控制科技有限公司 | It can be improved the heat treatment process of 50CrVA plunger spring fatigue strength |
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