CN113584423A - Gas nitriding process for multi-element alloy cast iron piston ring - Google Patents
Gas nitriding process for multi-element alloy cast iron piston ring Download PDFInfo
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- CN113584423A CN113584423A CN202110840761.8A CN202110840761A CN113584423A CN 113584423 A CN113584423 A CN 113584423A CN 202110840761 A CN202110840761 A CN 202110840761A CN 113584423 A CN113584423 A CN 113584423A
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- 238000005121 nitriding Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 25
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 17
- 229910001325 element alloy Inorganic materials 0.000 title claims abstract description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000011159 matrix material Substances 0.000 claims abstract description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 4
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims abstract description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 239000011651 chromium Substances 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 239000010949 copper Substances 0.000 claims abstract description 4
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 4
- 239000010439 graphite Substances 0.000 claims abstract description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 239000011733 molybdenum Substances 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 4
- 239000010955 niobium Substances 0.000 claims abstract description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 239000011574 phosphorus Substances 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 239000010703 silicon Substances 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 239000011593 sulfur Substances 0.000 claims abstract description 4
- 239000010936 titanium Substances 0.000 claims abstract description 4
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 4
- 239000010937 tungsten Substances 0.000 claims abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract 2
- 239000007789 gas Substances 0.000 claims description 25
- 239000000047 product Substances 0.000 claims description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 9
- 229910021529 ammonia Inorganic materials 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 6
- 238000000354 decomposition reaction Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000011265 semifinished product Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 150000004767 nitrides Chemical class 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 229910052729 chemical element Inorganic materials 0.000 abstract 1
- 150000002500 ions Chemical class 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 125000004433 nitrogen atom Chemical group N* 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- -1 nitrogen-containing compound Chemical class 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention relates to the technical field of piston ring gas nitriding, in particular to a gas nitriding process of a multi-element alloy cast iron piston ring, wherein the piston ring consists of chemical elements such as carbon, silicon, manganese, phosphorus, sulfur, chromium, molybdenum, copper, vanadium, titanium, tungsten, nickel and niobium, and the metallographic structure of graphite in the piston ring is fine, point-shaped, flaky and uniformly distributed; the metallographic structure of the matrix in the piston ring is a tempered sorbite, and the fine dispersed hard phase and the bar-shaped free carbide are less than or equal to 5 percent. The invention adopts the gas nitriding process, has the performances of simple equipment and convenient operation, the dimension of the product is stable in the nitriding process, the multi-element alloy cast iron piston ring material contains various nitride generating elements, and the process curve and the ammonia gas are matched to control parameters, so that the hardness of a nitrided layer is improved, the wear resistance of the product is improved, and the service life of the product is long.
Description
Technical Field
The invention relates to the technical field of piston ring gas nitriding, in particular to a gas nitriding process for a multi-element alloy cast iron piston ring.
Background
The nitriding treatment refers to a chemical heat treatment process for making nitrogen atoms penetrate into the surface layer of a workpiece in a certain medium at a certain temperature, and the current gas nitriding comprises the following steps:
decomposition of ammonia: 2NH3 → 2[ N ] +6[ H ] decomposed nitrogen is in atomic state, has larger activity, most of which is absorbed by the surface of the workpiece, and part of which is combined into nitrogen molecules;
absorption: after nitrogen atoms are adsorbed by the surface of the workpiece, ferrite with higher nitrogen content is formed;
diffusion: the nitrogen atoms are diffused inwards from the surface of the steel to generate a nitrogen-containing compound, and a nitride layer with a certain thickness is formed.
Ion nitriding
The metal workpiece is used as a cathode in a low vacuum furnace body filled with nitrogen-containing gas, the furnace body is used as an anode, nitrogen and hydrogen atoms in a medium are ionized under a high-voltage direct current electric field after electrification, a plasma region is formed between the cathode and the anode, positive ions of nitrogen and hydrogen are bombarded to the surface of the workpiece at high speed under the action of a strong electric field of the plasma region, the high kinetic energy of the ions is converted into heat energy, the surface of the workpiece is heated to a required temperature, atomic sputtering is generated on the surface of the workpiece due to the bombardment of the ions, and therefore the workpiece is purified, and meanwhile, due to the adsorption and diffusion effects, nitrogen permeates into the surface of the workpiece.
However, the traditional nitriding process of the multi-element alloy cast iron piston ring is ion nitriding, the ion nitriding equipment is complex, the operation requirement is strict, a workpiece is easy to deform, the local temperature is too high, the workpiece substrate is decomposed, and the product is scrapped. Accordingly, those skilled in the art have provided a gas nitriding process for multi-alloy cast iron piston rings to solve the problems set forth in the background art described above.
Disclosure of Invention
The invention aims to provide a gas nitriding process for a multi-element alloy cast iron piston ring, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the gas nitriding process for the multi-element alloy cast iron piston ring comprises the following components in percentage by weight: 2.00 to 3.30 percent of carbon, 3.30 to 4.60 percent of silicon, 0.70 to 1.20 percent of manganese, less than or equal to 0.35 percent of phosphorus, less than or equal to 0.15 percent of sulfur, 0.10 to 0.60 percent of chromium, 0.40 to 1.00 percent of molybdenum, 0.40 to 1.00 percent of copper, 0.20 to 0.70 percent of vanadium, less than or equal to 0.30 percent of titanium, 0.70 to 1.20 percent of tungsten, 0.40 to 1.00 percent of nickel and less than or equal to 0.40 percent of niobium;
the metallographic structure of the graphite in the piston ring is fine in point and sheet shape and is uniformly distributed;
the metallographic structure of the matrix in the piston ring is a tempered sorbite, and the fine dispersed hard phase and the bar-shaped free carbide are less than or equal to 5 percent;
the mechanical properties of the piston ring are as follows:
hardness: HRB 109-116;
bending strength: not less than 650N/mm2；
Modulus of elasticity: 130000-160000N/mm2；
The gas nitriding process of the piston ring comprises the following steps:
s1: device inspection
S2: nitriding operation
S21, selecting a corresponding clamp according to the diameter of the piston ring, and orderly installing the piston ring, pressing and hanging the piston ring on a hanging basket;
s22, hanging the hanging basket into the nitriding furnace, sealing a furnace cover, and starting a heating switch, circulating cooling water and a circulating fan;
and S23, adjusting the temperature according to the parameters of the description attached figures 1 and 2, and starting heat preservation and nitridation when the temperature is raised to 505 ℃.
And S24, closing the control switch after the temperature is reduced to 150 ℃, and opening the furnace cover to take out the product.
And S25, after cooling, detaching the product from the clamp, placing the product on a trolley, registering the number of points, and sending the product to a semi-finished product warehouse after inspection.
As a further aspect of the invention: the specific steps in S1 are as follows:
s11, checking whether the nitriding furnace, the electric system, the ammonia gas decomposer and the pressure pipeline are normal;
s12, checking whether the water pump works normally and whether cooling water circulates;
s13, checking whether the valve of the gas cylinder leaks gas or not and whether the vent pipe is blocked or not;
s14, checking whether the nitriding basket and the clamp are clean and firm;
and S15, checking whether the product is sandblasted before processing.
As a further aspect of the invention: the conditions for the thermal nitridation in S23 are as follows: keeping the flow of ammonia gas at 0.6-1.2m3The pressure is 500 +/-100 mm, the ammonia decomposition rate is 25-40%, the nitriding heat preservation time H of the piston ring is determined according to the requirements of a nitrided layer and is generally 300-420 minutes, the temperature is raised to 520 ℃ after the heat preservation is finished, the nitrogen is removed by ammonia for 180 minutes, then the temperature is reduced, and the record is made.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts a gas nitriding process, has the performances of simple equipment and convenient operation, and the product dimension is stable in the nitriding process;
the multi-element alloy cast iron piston ring material contains various nitride generating elements, and is matched with a process curve and ammonia gas control parameters, so that the hardness of a nitride layer is improved, the wear resistance of a product is improved, the service life of the product is long, and the problems that a workpiece is easy to deform, the local temperature is too high, the workpiece matrix is decomposed and the product is scrapped in the traditional process are solved.
Drawings
FIG. 1 is a schematic diagram of a gas nitriding process for a piston ring made of a multi-element alloy cast iron;
FIG. 2 is a diagram of the parameters of ammonia control in the gas nitriding process of the multi-element alloy cast iron piston ring;
Detailed Description
Referring to fig. 1-2, in the embodiment of the present invention, a gas nitriding process for a multi-element alloy cast iron piston ring comprises the following components by weight: 2.00 to 3.30 percent of carbon, 3.30 to 4.60 percent of silicon, 0.70 to 1.20 percent of manganese, less than or equal to 0.35 percent of phosphorus, less than or equal to 0.15 percent of sulfur, 0.10 to 0.60 percent of chromium, 0.40 to 1.00 percent of molybdenum, 0.40 to 1.00 percent of copper, 0.20 to 0.70 percent of vanadium, less than or equal to 0.30 percent of titanium, 0.70 to 1.20 percent of tungsten, 0.40 to 1.00 percent of nickel and less than or equal to 0.40 percent of niobium;
the metallographic structure of the graphite in the piston ring is fine in point and sheet shape and is uniformly distributed;
the metallographic structure of the matrix in the piston ring is a tempered sorbite, and the fine dispersed hard phase and the bar-shaped free carbide are less than or equal to 5 percent;
the mechanical properties of the piston ring are as follows:
hardness: HRB 109-116;
bending strength: not less than 650N/mm2；
Modulus of elasticity: 130000-160000N/mm2；
The gas nitriding process of the piston ring comprises the following steps:
s1: device inspection
S2: nitriding operation
S21, selecting a corresponding clamp according to the diameter of the piston ring, and orderly installing the piston ring, pressing and hanging the piston ring on a hanging basket;
s22, hanging the hanging basket into the nitriding furnace, sealing a furnace cover, and starting a heating switch, circulating cooling water and a circulating fan;
and S23, adjusting the temperature according to the parameters of the description attached figures 1 and 2, and starting heat preservation and nitridation when the temperature is raised to 505 ℃.
And S24, closing the control switch after the temperature is reduced to 150 ℃, and opening the furnace cover to take out the product.
And S25, after cooling, detaching the product from the clamp, placing the product on a trolley, registering the number of points, and sending the product to a semi-finished product warehouse after inspection.
Further, the specific steps in S1 are as follows:
s11, checking whether the nitriding furnace, the electric system, the ammonia gas decomposer and the pressure pipeline are normal;
s12, checking whether the water pump works normally and whether cooling water circulates;
s13, checking whether the valve of the gas cylinder leaks gas or not and whether the vent pipe is blocked or not;
s14, checking whether the nitriding basket and the clamp are clean and firm;
and S15, checking whether the product is sandblasted before processing.
Further, the conditions for the thermal nitridation in S23 are as follows: keeping the flow of ammonia gas at 0.6-1.2m3The pressure is 500 +/-100 mm, the ammonia decomposition rate is 25-40%, and the nitriding heat preservation time H of the piston ring is determined according to the requirements of a nitrided layer, and is generallyAnd (5) keeping the temperature for 420 minutes, heating to 520 ℃ after the heat preservation is finished, removing nitrogen by ammonia gas for 180 minutes, cooling, and recording.
Test examples
The gas nitriding test result of the multi-element alloy cast iron piston ring is as follows:
combining the above data: can learn this application nitrogenize technology nitride layer hardness height, increased product wear resistance, product long service life has solved the yielding of work piece among the traditional handicraft, and local high temperature causes the decomposition of work piece base member, the condemned problem of product.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (3)
1. The gas nitriding process of the multi-element alloy cast iron piston ring is characterized in that the piston ring consists of the following components in percentage by weight: 2.00 to 3.30 percent of carbon, 3.30 to 4.60 percent of silicon, 0.70 to 1.20 percent of manganese, less than or equal to 0.35 percent of phosphorus, less than or equal to 0.15 percent of sulfur, 0.10 to 0.60 percent of chromium, 0.40 to 1.00 percent of molybdenum, 0.40 to 1.00 percent of copper, 0.20 to 0.70 percent of vanadium, less than or equal to 0.30 percent of titanium, 0.70 to 1.20 percent of tungsten, 0.40 to 1.00 percent of nickel and less than or equal to 0.40 percent of niobium;
the metallographic structure of the graphite in the piston ring is fine in point and sheet shape and is uniformly distributed;
the metallographic structure of the matrix in the piston ring is a tempered sorbite, and the fine dispersed hard phase and the bar-shaped free carbide are less than or equal to 5 percent;
the mechanical properties of the piston ring are as follows:
hardness: HRB 109-116;
bending strength: not less than 650N/mm2；
Modulus of elasticity: 130000-160000N/mm2；
The gas nitriding process of the piston ring comprises the following steps:
s1: device inspection
S2: nitriding operation
S21, selecting a corresponding clamp according to the diameter of the piston ring, and orderly installing the piston ring, pressing and hanging the piston ring on a hanging basket;
s22, hanging the hanging basket into the nitriding furnace, sealing a furnace cover, and starting a heating switch, circulating cooling water and a circulating fan;
and S23, adjusting the temperature according to the parameters of the description attached figures 1 and 2, and starting heat preservation and nitridation when the temperature is raised to 505 ℃.
And S24, closing the control switch after the temperature is reduced to 150 ℃, and opening the furnace cover to take out the product.
And S25, after cooling, detaching the product from the clamp, placing the product on a trolley, registering the number of points, and sending the product to a semi-finished product warehouse after inspection.
2. The gas nitriding process for a multi-alloy cast iron piston ring according to claim 1, wherein the specific steps in S1 are as follows:
s11, checking whether the nitriding furnace, the electric system, the ammonia gas decomposer and the pressure pipeline are normal;
s12, checking whether the water pump works normally and whether cooling water circulates;
s13, checking whether the valve of the gas cylinder leaks gas or not and whether the vent pipe is blocked or not;
s14, checking whether the nitriding basket and the clamp are clean and firm;
and S15, checking whether the product is sandblasted before processing.
3. The gas nitriding process for a piston ring of multi-alloy cast iron according to claim 1, wherein the conditions for the heat-preserving nitriding in S23 are as follows: keeping the flow of ammonia gas at 0.6-1.2m3The pressure is 500 +/-100 mm, the ammonia decomposition rate is 25-40 percent, and the activity is highThe nitriding heat preservation time H of the plug ring is determined according to the requirements of a nitrided layer, generally 300-420 minutes, the temperature is raised to 520 ℃ after the heat preservation is finished, the nitrogen is removed by ammonia gas for 180 minutes, then the temperature is reduced, and the record is made.
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| CN202110840761.8A CN113584423A (en) | 2021-07-25 | 2021-07-25 | Gas nitriding process for multi-element alloy cast iron piston ring |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1176315A (en) * | 1996-07-25 | 1998-03-18 | Ae格策有限公司 | Iron casting alloy for producing piston ring of internal-combustion engine |
| JP2002194500A (en) * | 2000-12-26 | 2002-07-10 | Nippon Piston Ring Co Ltd | Piston ring |
| CN101403087A (en) * | 2008-11-10 | 2009-04-08 | 南平华闽汽车配件工业有限公司 | Nitridation apparatus and process for cast iron piston ring |
-
2021
- 2021-07-25 CN CN202110840761.8A patent/CN113584423A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1176315A (en) * | 1996-07-25 | 1998-03-18 | Ae格策有限公司 | Iron casting alloy for producing piston ring of internal-combustion engine |
| JP2002194500A (en) * | 2000-12-26 | 2002-07-10 | Nippon Piston Ring Co Ltd | Piston ring |
| CN101403087A (en) * | 2008-11-10 | 2009-04-08 | 南平华闽汽车配件工业有限公司 | Nitridation apparatus and process for cast iron piston ring |
Non-Patent Citations (3)
| Title |
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