CN115094368B - Preparation method of spray-free plunger - Google Patents
Preparation method of spray-free plunger Download PDFInfo
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- CN115094368B CN115094368B CN202210766847.5A CN202210766847A CN115094368B CN 115094368 B CN115094368 B CN 115094368B CN 202210766847 A CN202210766847 A CN 202210766847A CN 115094368 B CN115094368 B CN 115094368B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000011265 semifinished product Substances 0.000 claims abstract description 28
- 239000011159 matrix material Substances 0.000 claims abstract description 24
- 238000005121 nitriding Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000000227 grinding Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000005496 tempering Methods 0.000 claims abstract description 9
- 238000003754 machining Methods 0.000 claims abstract description 8
- 238000007514 turning Methods 0.000 claims abstract description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 73
- 238000000354 decomposition reaction Methods 0.000 claims description 21
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 7
- 239000000956 alloy Substances 0.000 abstract description 12
- 229910045601 alloy Inorganic materials 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 4
- 238000003672 processing method Methods 0.000 abstract description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052804 chromium Inorganic materials 0.000 abstract description 3
- 239000011651 chromium Substances 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000007747 plating Methods 0.000 abstract description 3
- 239000007921 spray Substances 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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
- 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
- C23C8/26—Nitriding of ferrous surfaces
-
- 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
- C23C8/02—Pretreatment of the material to be coated
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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)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention belongs to the technical field of plungers on plunger pumps of fracturing trucks, and discloses a preparation method of a spraying-free plunger. The invention carries out turning on 38CrMoAlA material to obtain a plunger matrix; tempering the plunger matrix to 350-420 HV; carrying out finish machining on the quenched and tempered plunger matrix to obtain a finish machining semi-finished product; nitriding the finished semi-finished product to obtain a plunger semi-finished product; wherein the depth of the nitriding layer is more than or equal to 0.5mm, and the surface hardness is more than or equal to 1000HV; and (3) finely grinding the semi-finished plunger to 940-950 HV to obtain the spraying-free plunger. The plunger manufactured by the method has excellent corrosion resistance and wear resistance, high anti-impact performance and long service life, and can meet the use of complex well conditions. The processing method does not need to spray alloy coating or chromium plating, meets the green production requirement, and has higher market application prospect.
Description
Technical Field
The invention relates to the technical field of plungers on plunger pumps of fracturing trucks, in particular to a preparation method of a spraying-free plunger.
Background
The plunger pump of the fracturing truck is an important device in the oil exploitation fracturing process, the plunger is a key part in the plunger pump, and the plunger bears huge pressure during fracturing operation, so that strict requirements on the performance of the plunger exist. Currently, plungers used in plunger pumps of fracturing trucks are required to have excellent wear resistance, and alloy coatings are usually sprayed on the surfaces of the plungers, for example, patent 200610088966.0 discloses a manufacturing method of an oil pump plunger, wherein alloy powder is sprayed on the surfaces of plunger rod bodies, and the manufactured plunger has stronger corrosion resistance and wear resistance. However, with the wide application of the alloy spraying technology, the defects of the alloy spraying technology are gradually revealed, a large amount of alloy dust is generated in the alloy spraying process, and the alloy spraying technology has serious threat to the health of practitioners and environmental pollution and does not accord with the development of the currently advocated green industry. As another example, patent CN112025229a discloses a processing method of a plunger for an oil pump, which includes plating chromium and spraying a zirconium dioxide coating on the surface of the plunger after processing and forming, so that the wear resistance of the plunger is improved, and the service life is prolonged. However, chromium plating treatment generates a large amount of waste water and gas, which adds a new burden to the production of enterprises.
Therefore, how to provide a spray-free process for preparing the plunger and simultaneously having good wear resistance is of great significance to green production in the petroleum exploitation industry.
Disclosure of Invention
The invention aims to provide a preparation method of a spraying-free plunger, which solves the problems in the existing plunger processing process.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a spraying-free plunger, which comprises the following steps:
(1) Turning the 38CrMoAlA material to obtain a plunger matrix;
(2) Tempering the plunger matrix to 340-420 HV;
(3) Carrying out finish machining on the quenched and tempered plunger matrix to obtain a finish machining semi-finished product;
(4) Nitriding the finished semi-finished product to obtain a plunger semi-finished product; wherein the depth of the nitriding layer is more than or equal to 0.5mm, and the surface hardness is more than or equal to 1000HV;
(5) And (3) finely grinding the semi-finished plunger to 940-950 HV to obtain the spraying-free plunger.
Preferably, in the above method for preparing a spraying-free plunger, the finishing allowance in the step (3) is 0.05-0.08 mm.
Preferably, in the above method for preparing a spraying-free plunger, the nitriding conditions in the step (4) are as follows:
heating to 300-350 deg.c, introducing ammonia gas at 3L/H and furnace pressure of 35-40 mm/H 2 O, preserving heat for 2h;
raising the furnace temperature to 400-450 ℃, regulating the flow rate of ammonia gas to 3.5-4L/H and the furnace pressure to 35-40 mm/H 2 O, preserving heat for 3h;
raising the furnace temperature to 480-505 ℃, preserving heat for 30min, and then adjusting the flow of ammonia gas to ensure that the ammonia gas decomposition rate is 20-25%, and the furnace pressure is 140-160 mm/H 2 O, preserving heat for 20-22 h;
raising the furnace temperature to 530 ℃, and adjusting the flow of ammonia gas to ensure that the ammonia gasThe gas decomposition rate is 50-55%, and the furnace pressure is 140-160 mm/H 2 O, preserving heat for 30h, then adjusting the flow of ammonia gas to ensure that the decomposition rate of the ammonia gas is 85%, and preserving heat for 2h;
stopping heating after heat preservation is finished, adjusting the flow rate of ammonia gas to be 1L/H and the furnace pressure to be 50-60 mm/H 2 O, simultaneously opening an air cooler for cooling;
when the furnace temperature is reduced to be less than or equal to 120 ℃, closing ammonia gas, opening a furnace cover, discharging, and air cooling to room temperature. Compared with the prior art, the invention has the following beneficial effects:
(1) The invention adopts 38CrMoAlA alloy structural steel as the raw material of the plunger, the material has higher surface hardness, fatigue strength, good heat resistance and corrosion resistance, the wear resistance after nitriding is greatly improved, and the problem that the traditional alloy material needs to be sprayed with an alloy coating to improve the wear resistance is solved. The plunger manufactured by the method has excellent corrosion resistance and wear resistance, high anti-impact performance and long service life, and can meet the use of complex well conditions.
(2) The plunger seal of the invention adopts flexible materials, such as rubber or polyurethane, and the like, so that the plunger is less scratched in the use process, even if slight scratches appear, the plunger can be reused after being repaired by fine grinding, and the service life is prolonged.
(3) The service cycle of the spray-free plunger is longer than 300 hours and is far longer than 200 hours of the traditional spray coating process. Moreover, because the plunger clamp is high in hardness and not easy to damage, the plunger clamp can be repeatedly installed and used on the same type equipment for many times, and even if the plunger reaches the service cycle, the plunger clamp can be recycled and reused for many times after being polished, so that the whole service life cycle of a single plunger is longer than 1000 hours.
(4) The 38CrMoAlA alloy structural steel adopted by the invention has higher self-value, and after the plunger piston exceeds the service cycle, the recycling value of the waste is still higher, so that the production cost of enterprises is reduced.
(5) The processing method of the invention has no spraying or chromeplating treatment, avoids the harm to the health of operators, and simultaneously does not generate a large amount of dust and waste gas, thereby fundamentally solving the problem of environmental pollution of spray type plungers. The processing method meets the requirements of green production, and has higher market application value and development prospect.
Detailed Description
The invention provides a preparation method of a spraying-free plunger, which comprises the following steps:
(1) Turning the 38CrMoAlA material to obtain a plunger matrix;
(2) Tempering the plunger matrix to 350-420 HV;
(3) Carrying out finish machining on the quenched and tempered plunger matrix to obtain a finish machining semi-finished product;
(4) Nitriding the finished semi-finished product to obtain a plunger semi-finished product; wherein the depth of the nitriding layer is more than or equal to 0.5mm, and the surface hardness is more than or equal to 1000HV;
(5) And (3) finely grinding the semi-finished plunger to 940-950 HV to obtain the spraying-free plunger.
In the present invention, the tempering in the step (2) is preferably 354 to 416HV, more preferably 367 to 402HV, and still more preferably 380HV.
In the present invention, the finishing allowance in the step (3) is preferably 0.06 to 0.08mm, more preferably 0.07 to 0.08mm, and still more preferably 0.08mm.
In the present invention, the nitriding conditions in the step (4) are preferably:
heating to 300-350 deg.c, introducing ammonia gas at 3L/H and furnace pressure of 35-40 mm/H 2 O, preserving heat for 2h;
raising the furnace temperature to 400-450 ℃, regulating the flow rate of ammonia gas to 3.5-4L/H and the furnace pressure to 35-40 mm/H 2 O, preserving heat for 3h;
raising the furnace temperature to 480-505 ℃, preserving heat for 30min, and then adjusting the flow of ammonia gas to ensure that the ammonia gas decomposition rate is 20-25%, and the furnace pressure is 140-160 mm/H 2 O, preserving heat for 20-22 h;
raising the furnace temperature to 530 ℃, regulating the flow of ammonia gas to ensure that the ammonia gas decomposition rate is 50-55%, and the furnace pressure is 140-160 mm/H 2 O, preserving heat for 30h, then adjusting the flow of ammonia gas to ensure that the decomposition rate of the ammonia gas is 85%, and preserving heat for 2h;
stopping heating after heat preservation is finished, adjusting the flow rate of ammonia gas to be 1L/H and the furnace pressure to be 50-60 mm/H 2 O, simultaneously opening an air cooler for cooling;
when the furnace temperature is reduced to be less than or equal to 120 ℃, closing ammonia gas, opening a furnace cover, discharging, and air cooling to room temperature.
In the invention, the depth of the nitriding layer in the step (4) is preferably more than or equal to 0.5mm, and more preferably more than or equal to 0.6mm; the surface hardness is preferably not less than 1005HV, more preferably not less than 1010HV, and still more preferably not less than 1015HV.
In the present invention, the fine grinding in the step (5) is preferably performed to 941 to 950HV, more preferably 944 to 950HV, and still more preferably 950HV. After nitriding treatment, the surface hardness of the workpiece is greatly improved, but after the surface hardness is too high, two defects exist: firstly, the brittleness is larger, the brittleness of an important workpiece is required to reach 1-2 levels, and the brittleness is increased after nitriding treatment, so that the performance is difficult to realize; secondly, the hardness is too high, so that adhesive wear is easy to generate in the use process, abrasive particle wear and surface fatigue wear are generated, and finally corrosive wear is generated. Therefore, the control of the hardness of the test piece after nitriding treatment is critical for the wear resistance, corrosion resistance and service life of the plunger.
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment provides a preparation method of a spraying-free plunger, which comprises the following steps:
(1) Turning the 38CrMoAlA material to obtain a plunger matrix;
(2) Tempering the plunger matrix to 370HV;
(3) Finishing the quenched and tempered plunger matrix, wherein the finishing allowance is 0.06mm, and a finished semi-finished product is obtained;
(4) Finishing the semi-finished productNitriding to obtain a semi-finished plunger; wherein, the nitriding conditions are as follows: heating to 350 deg.C, introducing ammonia gas at 3L/H and 40mm/H furnace pressure 2 O, preserving heat for 2h; raising the furnace temperature to 450 ℃, regulating the flow rate of ammonia gas to 4L/H, and regulating the furnace pressure to 40mm/H 2 O, preserving heat for 3h; raising the furnace temperature to 505 ℃, preserving heat for 30min, and then adjusting the flow of ammonia gas to ensure that the ammonia gas decomposition rate is 20 percent and the furnace pressure is 140mm/H 2 O, preserving heat for 22h; raising the furnace temperature to 530 ℃, regulating the flow of ammonia gas to ensure that the ammonia gas decomposition rate is 55%, and the furnace pressure is 140mm/H 2 O, preserving heat for 30h, then adjusting the flow of ammonia gas to ensure that the decomposition rate of the ammonia gas is 85%, and preserving heat for 2h; stopping heating after heat preservation is finished, adjusting the flow rate of ammonia gas to be 1L/H and the furnace pressure to be 50mm/H 2 O, simultaneously opening an air cooler for cooling; when the furnace temperature is reduced to be less than or equal to 120 ℃, closing ammonia gas, opening a furnace cover, discharging the finished semi-finished product, and air-cooling to room temperature;
the depth of the nitrided layer of the semi-finished plunger product is more than or equal to 0.5mm, the surface hardness is 1050HV, the thickness is 1010HV from the surface, the thickness is 930HV from the surface 0.2mm, the thickness is 850HV from the surface 0.3mm, the thickness is 550HV from the surface 0.4mm, the thickness is 430HV from the surface 0.5mm, and the thickness is 300HV from the surface 0.6mm;
(5) And (3) finely grinding the semi-finished plunger to 950HV to obtain the spraying-free plunger.
Example 2
The embodiment provides a preparation method of a spraying-free plunger, which comprises the following steps:
(1) Turning the 38CrMoAlA material to obtain a plunger matrix;
(2) Tempering the plunger matrix to 400HV;
(3) Finishing the quenched and tempered plunger matrix, wherein the finishing allowance is 0.08mm, and a finished semi-finished product is obtained;
(4) Nitriding the finished semi-finished product to obtain a plunger semi-finished product; wherein, the nitriding conditions are as follows: heating to 320 deg.C, introducing ammonia gas at flow rate of 3L/H and furnace pressure of 37mm/H 2 O, preserving heat for 2h; raising the furnace temperature to 420 ℃, regulating the flow rate of ammonia gas to 3.5L/H and the furnace pressure to 37mm/H 2 O, preserving heat for 3h; raising the furnace temperature to 500 ℃, and preserving the heat for 30miAfter n, the ammonia flow is regulated to ensure that the ammonia decomposition rate is 21 percent and the furnace pressure is 150mm/H 2 O, preserving heat for 20h; raising the furnace temperature to 530 ℃, regulating the flow of ammonia gas to ensure that the ammonia gas decomposition rate is 52%, and the furnace pressure is 150mm/H 2 O, preserving heat for 30h, then adjusting the flow of ammonia gas to ensure that the decomposition rate of the ammonia gas is 85%, and preserving heat for 2h; stopping heating after heat preservation is finished, adjusting the flow of ammonia gas to be 1L/H and the furnace pressure to be 55mm/H 2 O, simultaneously opening an air cooler for cooling; when the furnace temperature is reduced to be less than or equal to 120 ℃, closing ammonia gas, opening a furnace cover, discharging the finished semi-finished product, and air-cooling to room temperature;
the depth of the nitrided layer of the plunger semi-finished product is more than or equal to 0.5mm, the surface hardness is 1030HV, the surface hardness is 1000HV, the surface hardness is 0.1mm, the surface hardness is 930HV, the surface hardness is 0.2mm, the surface hardness is 840HV, the surface hardness is 0.3mm, the surface hardness is 530HV, the surface hardness is 0.4mm, the surface hardness is 420HV, and the surface hardness is 0.6mm and is 300HV;
(5) And (3) finely grinding the semi-finished plunger to 940HV to obtain the spraying-free plunger.
Example 3
The embodiment provides a preparation method of a spraying-free plunger, which comprises the following steps:
(1) Turning the 38CrMoAlA material to obtain a plunger matrix;
(2) Tempering the plunger matrix to 420HV;
(3) Finishing the quenched and tempered plunger matrix, wherein the finishing allowance is 0.07mm, and a finished semi-finished product is obtained;
(4) Nitriding the finished semi-finished product to obtain a plunger semi-finished product; wherein, the nitriding conditions are as follows: heating to 330 deg.C, introducing ammonia gas at flow rate of 3L/H and furnace pressure of 35mm/H 2 O, preserving heat for 2h; raising the furnace temperature to 400 ℃, regulating the flow rate of ammonia gas to 3.5L/H, and regulating the furnace pressure to 35mm/H 2 O, preserving heat for 3h; raising the furnace temperature to 490 ℃, preserving heat for 30min, and then adjusting the flow of ammonia gas to ensure that the ammonia gas decomposition rate is 25 percent and the furnace pressure is 140mm/H 2 O, preserving heat for 21h; raising the furnace temperature to 530 ℃, regulating the flow of ammonia gas to ensure that the ammonia gas decomposition rate is 50%, and the furnace pressure is 140mm/H 2 O, preserving heat for 30h, then adjusting the flow of ammonia gas to ensure that the decomposition rate of the ammonia gas is 85%, and preserving heat for 2h; stopping heating after heat preservation is finishedRegulating the flow of ammonia gas to be 1L/H and the furnace pressure to be 55mm/H 2 O, simultaneously opening an air cooler for cooling; when the furnace temperature is reduced to be less than or equal to 120 ℃, closing ammonia gas, opening a furnace cover, discharging the finished semi-finished product, and air-cooling to room temperature;
the depth of the nitrided layer of the plunger semi-finished product is more than or equal to 0.5mm, the surface hardness is 1020HV, the thickness is 990HV from the surface, the thickness is 910HV from the surface, the thickness is 820HV from the surface, the thickness is 490HV from the surface, the thickness is 370HV from the surface, and the thickness is 250HV from the surface, the thickness is 0.6mm;
(5) And (5) finely grinding the semi-finished plunger to 945HV to obtain the spraying-free plunger.
Example 4
The embodiment provides a preparation method of a spraying-free plunger, which comprises the following steps:
(1) Turning the 38CrMoAlA material to obtain a plunger matrix;
(2) Tempering the plunger matrix to 350HV;
(3) Finishing the quenched and tempered plunger matrix, wherein the finishing allowance is 0.08mm, and a finished semi-finished product is obtained;
(4) Nitriding the finished semi-finished product to obtain a plunger semi-finished product; wherein, the nitriding conditions are as follows: heating to 340 deg.C, introducing ammonia gas with flow rate of 3L/H and furnace pressure of 38mm/H 2 O, preserving heat for 2h; raising the furnace temperature to 430 ℃, regulating the flow rate of ammonia gas to 4L/H, and regulating the furnace pressure to 38mm/H 2 O, preserving heat for 3h; raising the furnace temperature to 495 ℃, preserving heat for 30min, and then adjusting the flow of ammonia gas to ensure that the ammonia gas decomposition rate is 25%, and the furnace pressure is 160mm/H 2 O, preserving heat for 22h; raising the furnace temperature to 530 ℃, regulating the flow of ammonia gas to ensure that the ammonia gas decomposition rate is 55%, and the furnace pressure is 160mm/H 2 O, preserving heat for 30h, then adjusting the flow of ammonia gas to ensure that the decomposition rate of the ammonia gas is 85%, and preserving heat for 2h; stopping heating after heat preservation is finished, adjusting the flow rate of ammonia gas to be 1L/H and the furnace pressure to be 60mm/H 2 O, simultaneously opening an air cooler for cooling; when the furnace temperature is reduced to be less than or equal to 120 ℃, closing ammonia gas, opening a furnace cover, discharging the finished semi-finished product, and air-cooling to room temperature;
the depth of the nitrided layer of the semi-finished plunger product is more than or equal to 0.5mm, the surface hardness is 1040HV, the thickness is 1005HV from the surface, the thickness is 920HV from the surface, the thickness is 830HV from the surface, the thickness is 0.3mm, the thickness is 510HV from the surface, the thickness is 400HV from the surface, the thickness is 0.5mm, and the thickness is 280HV from the surface;
(5) And (3) finely grinding the semi-finished plunger to 950HV to obtain the spraying-free plunger.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (2)
1. The preparation method of the spraying-free plunger is characterized by comprising the following steps of:
(1) Turning the 38CrMoAlA material to obtain a plunger matrix;
(2) Tempering the plunger matrix to 340-420 HV;
(3) Carrying out finish machining on the quenched and tempered plunger matrix to obtain a finish machining semi-finished product;
(4) Nitriding the finished semi-finished product to obtain a plunger semi-finished product; wherein the depth of the nitriding layer is more than or equal to 0.5mm, and the surface hardness is more than or equal to 1000HV;
(5) Fine grinding the semi-finished plunger to 940-950 HV to obtain a spraying-free plunger;
wherein, the nitriding conditions in the step (4) are as follows:
heating to 300-350 deg.c, introducing ammonia gas at 3L/H and furnace pressure of 35-40 mm/H 2 O, preserving heat for 2h;
raising the furnace temperature to 400-450 ℃, regulating the flow rate of ammonia gas to 3.5-4L/H and the furnace pressure to 35-40 mm/H 2 O, preserving heat for 3h;
raising the furnace temperature to 480-505 ℃, preserving heat for 30min, and then adjusting the flow of ammonia gas to ensure that the ammonia gas decomposition rate is 20-25%, and the furnace pressure is 140-160 mm/H 2 O, preserving heat for 20-22 h;
raising the furnace temperature to 530 ℃, regulating the flow of ammonia gas to ensure that the ammonia gas decomposition rate is 50-55%, and the furnace pressure is 140-160 mm/H 2 O, preserving heat for 30h, and then adjusting the flow of ammonia gas to ensure that the ammonia gas decomposition rate is as follows85%, and preserving heat for 2h;
stopping heating after heat preservation is finished, adjusting the flow rate of ammonia gas to be 1L/H and the furnace pressure to be 50-60 mm/H 2 O, simultaneously opening an air cooler for cooling;
when the furnace temperature is reduced to be less than or equal to 120 ℃, closing ammonia gas, opening a furnace cover, discharging, and air cooling to room temperature.
2. The method for preparing a spray-free plunger according to claim 1, wherein the finishing allowance in the step (3) is 0.05-0.08 mm.
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| CN202210766847.5A CN115094368B (en) | 2022-06-30 | 2022-06-30 | Preparation method of spray-free plunger |
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| CN202210766847.5A CN115094368B (en) | 2022-06-30 | 2022-06-30 | Preparation method of spray-free plunger |
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| CN115094368B true CN115094368B (en) | 2024-02-09 |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011032514A (en) * | 2009-07-31 | 2011-02-17 | Nippon Parkerizing Co Ltd | Steel member having nitrogen compound layer and process of producing the same |
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| CN115094368A (en) | 2022-09-23 |
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