CN115306580B - Method for improving quality of engine oil ring scraping blade - Google Patents
Method for improving quality of engine oil ring scraping blade Download PDFInfo
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- CN115306580B CN115306580B CN202211041413.5A CN202211041413A CN115306580B CN 115306580 B CN115306580 B CN 115306580B CN 202211041413 A CN202211041413 A CN 202211041413A CN 115306580 B CN115306580 B CN 115306580B
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- oil ring
- scraping blade
- nitriding layer
- depth
- fracture
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- 238000007790 scraping Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000010705 motor oil Substances 0.000 title claims abstract description 13
- 239000003921 oil Substances 0.000 claims abstract description 110
- 238000005121 nitriding Methods 0.000 claims abstract description 93
- 238000012360 testing method Methods 0.000 claims abstract description 34
- 238000005452 bending Methods 0.000 claims abstract description 17
- 238000012795 verification Methods 0.000 claims abstract description 12
- 239000011159 matrix material Substances 0.000 claims abstract description 10
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 claims abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 15
- 238000005336 cracking Methods 0.000 claims description 12
- 238000007689 inspection Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 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 description 4
- 238000011049 filling Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- OXNIZHLAWKMVMX-UHFFFAOYSA-N picric acid Chemical compound OC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O OXNIZHLAWKMVMX-UHFFFAOYSA-N 0.000 claims description 3
- 238000012876 topography Methods 0.000 claims description 2
- 229910021529 ammonia Inorganic materials 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- F16J9/12—Details
- F16J9/20—Rings with special cross-section; Oil-scraping rings
Abstract
The invention discloses a method for improving the quality of an engine oil ring scraping blade, which comprises the following steps: analyzing the surface state and the microscopic morphology of the fracture position of the oil ring scraping blade; sampling and checking the depth of the outer cylindrical nitriding layer near the breaking position of the oil ring scraping pieces, and counting the depth range of the outer cylindrical nitriding layer of all broken oil ring scraping pieces; the depth of an outer cylindrical nitriding layer during the preparation of the oil ring scraping piece is reduced; testing or observing the matrix hardness, metallographic structure, outer circle nitriding layer depth, nitriding layer brittleness and surface state of fracture after bending of the oil ring scraping blade after the outer circle nitriding layer depth is reduced, and then carrying out bench verification; determining the depth range of the outer cylindrical nitriding layer capable of meeting the use requirement according to the result of the steps; when the oil ring scraping blade is prepared, the depth of an excircle nitriding layer of the oil ring scraping blade is controlled to be within a determined range; the method can obviously improve the quality of the oil ring scraping blade, so that the oil ring scraping blade can meet the use requirement of an F-type engine.
Description
Technical Field
The invention belongs to the field of oil ring scraping blade quality control, and particularly relates to a method for improving the quality of an engine oil ring scraping blade.
Background
The oil ring scraping blade (with an upper scraping blade and a lower scraping blade) is an important part of the engine, when the piston moves upwards, the round surface of the upper scraping blade is slightly inclined, the upper edge surface slides with the cylinder hole, and the cylinder Kong Youmo keeps a sliding state; the lower scraping blade does not incline in the moving process, the center of the outer circular surface is contacted with the cylinder hole, and oil can be effectively scraped, so that an oil film on the cylinder hole is thin enough.
With the improvement of the performance of the engine such as power and torque, the requirements on the wear resistance of the oil ring scraping blade are improved so as to ensure the normal operation of the engine, and the material mark commonly used for the oil ring scraping blade at present is A661 mark.
However, in actual production, after the oil ring wiper blade made of a material with the brand A661 is used for an engine with the model F, the oil ring wiper blade often has a fracture failure quality problem in assembly of a production line.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for improving the quality of an oil ring scraping blade of an engine, which can obviously improve the quality of the oil ring scraping blade and enable the oil ring scraping blade to meet the use requirement of an F-type engine.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method of improving the quality of an engine oil ring wiper, the method comprising the steps of:
(1) Analyzing the surface state and the microscopic morphology of the fracture position of the oil ring scraping blade, and judging whether the oil ring scraping blade belongs to brittle fracture;
(2) If the oil ring is brittle, sampling and checking the depth of the outer cylindrical nitriding layer in the range of 0.3-0.5 cm of the breaking position of the oil ring scraping blade, and counting the depth range of the outer cylindrical nitriding layer of all broken oil ring scraping blades;
(3) Reducing the depth of the outer cylindrical nitriding layer of the oil ring scraping blade during preparation on the basis of the depth range of the outer cylindrical nitriding layer of the oil ring scraping blade counted in the step (2);
(4) Testing or observing the matrix hardness, metallographic structure, outer circle nitriding layer depth, nitriding layer brittleness and surface state of fracture after bending of the oil ring scraping blade after the outer circle nitriding layer depth is reduced, and then carrying out bench verification;
(5) Determining the depth range of the outer cylindrical nitriding layer which can meet the use requirement of the oil ring scraping blade according to the test and verification results in the step (4);
(6) And (3) controlling the depth of the outer circle nitriding layer within the depth range of the outer circle nitriding layer determined in the step (5) when the oil ring scraping blade is manufactured.
In the step (1), if the fracture of the oil ring wiper originates from the outside, the fracture surface is flush, and the surface microscopic morphology is along the crystal, the fracture belongs to brittle fracture.
In the steps (2) and (4), the method for testing the depth of the outer cylindrical nitriding layer is carried out according to the specification in GB/T11354-2005 steel part nitriding layer depth determination and metallographic structure inspection.
In the step (4), the hardness test of the matrix is carried out by referring to the method in GB/T4340.1-2009 first part test method for Vickers hardness of metals.
In the step (4), during metallographic structure test, the etchant adopts a mixed solution consisting of 3.5-4.5 g picric acid, 4.5-5.5 mL hydrochloric acid and 90-110 mL ethanol; the etching time is 20-30 seconds.
In the step (4), the method for testing the brittleness of the nitriding layer is carried out according to the specification in GB/T11354-2005 steel part nitriding layer depth determination and metallographic structure inspection, and grade 1-2 is qualified.
In the step (4), the method for testing or observing the surface state of the fracture after bending is as follows: broken at 180 ° of the opening of the oil ring wiper blade, and the surface state near the broken portion was observed under a magnifying glass.
In the step (4), the bench verification method comprises the following steps: and (3) assembling the oil ring scraping blade on an F-type engine, carrying out a 500-hour rated power bench test, disassembling the engine after the test, and observing whether the oil ring scraping blade is normal or not and whether a fracture phenomenon occurs or not.
In the step (5), the hardness of a matrix of the oil ring scraping blade capable of meeting the use requirement is 312 HV-320 HV, a metallographic structure is tempered sorbite and granular carbide, the depth of an excircle nitriding layer is 0.01-0.03 mm, the brittleness level of the nitriding layer is 1-2, no obvious crack is generated near a fracture after bending, and the oil ring scraping blade is verified by a bench to be normal and has no fracture phenomenon.
In the steps (3) and (6), the nitriding treatment method for preparing the oil ring scraping blade comprises the following steps: and (3) filling cracking ammonia gas into an ammonia gas cracking control system for nitriding treatment.
The process flow of the oil ring scraping blade during preparation is as follows: raw material inspection, ring winding, nitriding treatment, manganese phosphating, outer circle grinding, demagnetizing, cutting-off, heat qualitative treatment, demagnetizing, coating, polishing, color mark coating, final inspection and packaging.
In the step (6), an ammonia gas cracking control system is adopted, cracking ammonia gas is filled in to carry out nitriding treatment at the temperature of 540+/-10 ℃, and the nitriding treatment time is controlled to be 85-95 min, so that the depth of the nitriding layer of the excircle of the oil ring scraping blade can be controlled to be 0.01-0.03 mm.
According to the method for improving the quality of the oil ring scraping blade of the engine, provided by the invention, the matrix hardness, metallographic structure, depth of an outer cylindrical nitriding layer, brittleness of the nitriding layer, surface state of a fracture after bending and bench verification result of the oil ring scraping blade meeting the use requirement are determined, and quality evaluation standards and quality assurance are provided for the production of the oil ring scraping blade meeting the use requirement of an F-type engine, so that the problem of fracture failure quality of the oil ring scraping blade in assembly of a production line is solved.
Drawings
FIG. 1 is a schematic view of a broken oil ring wiper in a production line assembly;
FIG. 2 is a topographical view of an oil ring wiper break;
FIG. 3 is a surface micro-topography of an oil ring wiper break;
FIG. 4 is a schematic illustration of nitriding process adopted in the embodiment for improving the quality of the oil ring wiper;
FIG. 5 is a metallographic view of a base body of an improved oil ring wiper in an example;
FIG. 6 is a graph of the depth measurement of the outer nitrided layer of the improved oil ring wiper in the examples;
FIG. 7 is a graph showing the results of the nitriding layer brittleness test of the oil ring wiper after the improvement in the example;
FIG. 8 is a bending test schematic of an oil ring wiper;
FIG. 9 is a schematic diagram showing a fracture state after a bending test of the modified oil ring wiper in the example;
FIG. 10 is a schematic view of nitriding process of the oil ring wiper in the comparative example;
FIG. 11 is a graph of the outer nitrided layer depth measurement of the oil ring wiper in the comparative example;
FIG. 12 is a graph showing the results of nitriding layer brittleness test of the oil ring wiper in the comparative example;
fig. 13 is a schematic diagram showing a fracture state after the oil ring wiper bending test in the comparative example.
Detailed Description
The material of the oil ring wiper in the embodiment is A661, and the process flow of the oil ring wiper in preparation is as follows: raw material inspection, ring winding, nitriding treatment, manganese phosphating, outer circle grinding, demagnetizing, cutting-off, heat qualitative treatment, demagnetizing, coating, polishing, color mark coating, final inspection and packaging.
The chemical elements and weight percentages of the material of the oil ring wiper, brand A661, meet the specifications in Table 1, and the balance is iron and unavoidable impurities.
TABLE 1
The present invention will be described in detail with reference to examples.
Examples
The invention provides a method for improving the quality of an engine oil ring scraping blade, which comprises the following steps:
(1) Analyzing the surface state and the microscopic morphology of the fracture position of the oil ring scraping blade, and judging whether the oil ring scraping blade belongs to brittle fracture; the broken oil ring wiper is shown in figure 1; the fracture was found to originate from the outside and the section was flush, see figure 2;
the surface micro-morphology has edge crystals, see fig. 3; the visible oil ring wiper fracture property is brittle fracture;
(2) If the steel part is brittle fracture, sampling in a range of 0.3-0.5 cm from the fracture position of the oil ring scraping blade, checking the depth of an outer cylindrical nitriding layer according to GB/T11354-2005 steel part nitriding layer depth determination and metallographic structure inspection, and counting the depth range of the outer cylindrical nitriding layer of all the broken oil ring scraping blades; finding that the depth range of the excircle nitriding layer of all broken oil ring scraping pieces is distributed above 0.03 mm; the comprehensive analysis shows that: the oil ring scraping blade has high brittleness after the nitriding process due to the design structure of the thin ring height (0.35+/-0.1 mm), and is greatly influenced by the depth of the nitriding layer; once the depth value of the outer cylindrical nitriding layer is large, the brittleness of the oil ring scraping piece is larger, and brittle fracture is easy to occur under the action of an assembly external force;
(3) Reducing the depth of the outer cylindrical nitriding layer of the oil ring scraping blade during preparation on the basis of the depth range of the outer cylindrical nitriding layer of the oil ring scraping blade counted in the step (2); filling cracking ammonia gas to carry out nitriding treatment by adopting an ammonia gas cracking control system, and controlling the nitriding treatment time to control the depth of the outer cylindrical nitriding layer;
(4) Testing or observing the matrix hardness, metallographic structure, outer circle nitriding layer depth, nitriding layer brittleness and surface state of fracture after bending of the oil ring scraping blade after the outer circle nitriding layer depth is reduced, and then carrying out bench verification;
(5) Determining the depth range of the outer cylindrical nitriding layer which can meet the use requirement of the oil ring scraping blade according to the test and verification results in the step (4);
(6) And (3) controlling the depth of the outer circle nitriding layer within the depth range of the outer circle nitriding layer determined in the step (5) when the oil ring scraping blade is manufactured.
In the step (4), the method for testing the depth of the outer cylindrical nitriding layer is carried out according to the specification in GB/T11354-2005 steel part nitriding layer depth determination and metallographic structure inspection.
In the step (4), the hardness test of the matrix is carried out by referring to the method in GB/T4340.1-2009 first part test method for Vickers hardness of metals.
In the step (4), during metallographic structure test, the etchant adopts a mixed solution consisting of 3.5-4.5 g picric acid, 4.5-5.5 mL hydrochloric acid and 90-110 m L ethanol; the etching time is 20-30 seconds.
In the step (4), the method for testing the brittleness of the nitriding layer is carried out according to the specification in GB/T11354-2005 steel part nitriding layer depth determination and metallographic structure inspection, and grade 1-2 is qualified.
In the step (4), the method for testing or observing the surface state of the fracture after bending is as follows: broken at 180 ° of the opening of the oil ring wiper blade, and the surface state near the broken portion was observed under a magnifying glass.
In the step (4), the bench verification method comprises the following steps: and (3) assembling the oil ring scraping blade on an F-type engine, carrying out a 500-hour rated power bench test, disassembling the engine after the test, and observing whether the oil ring scraping blade is normal or not and whether a fracture phenomenon occurs or not.
In the step (5), the hardness of a matrix of the oil ring scraping blade capable of meeting the use requirement is 312 HV-320 HV, a metallographic structure is tempered sorbite and granular carbide, the depth of an excircle nitriding layer is 0.01-0.03 mm, the brittleness level of the nitriding layer is 1-2, no obvious crack is generated near a fracture after bending, and the oil ring scraping blade is verified by a bench to be normal and has no fracture phenomenon.
In the step (6), an ammonia gas cracking control system is adopted, cracking ammonia gas is filled in to carry out nitriding treatment at the temperature of 540+/-10 ℃, the nitriding treatment time is controlled to be 85-95 min, and the depth of the nitriding layer of the excircle of the oil ring scraping blade can be controlled to be 0.01-0.03 mm, and the nitriding process is shown in figure 4; under this condition, 6 batches of oil ring scraping pieces are produced according to the processes of ring winding, nitriding treatment, manganese phosphating, outer circle grinding, demagnetizing, cutting-off, heat qualitative treatment, demagnetizing, coating, polishing, color marking, final inspection and packaging, and the depths of outer circle nitrided layers of the obtained oil ring scraping pieces are shown in table 2.
TABLE 2
The actual measured value of the matrix hardness of the obtained oil ring scraping blade is in the range of 312 HV-320 HV; the metallographic structures are tempered sorbite and granular carbide, and are shown in figure 5; the detection result of the brittleness of the nitride layer is shown in fig. 7, and the perfect defect of the indentation corners is shown in the graph, and the evaluation is 1 grade; the bending position label of the on-site bending test is shown in fig. 8, the result is shown in fig. 9, no obvious crack is found near the fracture, and the fact that the depth value of the nitriding layer is small and the brittleness is not large is indicated.
In actual production, after the oil ring wiper blade made of A661-grade materials is used for an F-type engine, the oil ring wiper blade often has fracture failure quality problems in assembly of a production line.
The nitriding process adopted by the oil ring wiper having such a problem in comparison with the step (6) in example 1 is: directly taking ammonia gas as nitriding treatment gas, nitriding for 140min at 540+/-10 ℃, wherein the nitriding process is shown in figure 10; the depth of the outer nitrided layer of the oil ring wiper thus obtained is shown in fig. 11; the detection result of the brittleness of the nitride layer is shown in fig. 12, and the three sides of the indentation are provided with cracks, and the quality is rated as 4 grades and is unqualified; the results of the in-situ bending test are shown in fig. 13, and the situation that a plurality of dominant and invisible cracks appear near the fracture shows that the depth value of the nitriding layer is large and the brittleness is large.
Therefore, before the quality of the oil ring scraping blade is improved by the method, the oil ring scraping blade is always broken and loses quality in the assembly of a production line, and the use requirement cannot be met.
The above detailed description of a method of improving the quality of an engine oil ring wiper with reference to the embodiments is illustrative and not limiting, and several embodiments can be listed according to the defined scope, thus variations and modifications without departing from the general inventive concept shall fall within the scope of protection of the present invention.
Claims (10)
1. A method of improving the quality of an engine oil ring wiper, the method comprising the steps of:
(1) Analyzing the surface state and the microscopic morphology of the fracture position of the oil ring scraping blade, and judging whether the oil ring scraping blade belongs to brittle fracture;
(2) If the oil ring is brittle, sampling and checking the depth of the outer cylindrical nitriding layer in the range of 0.3-0.5 cm of the breaking position of the oil ring scraping blade, and counting the depth range of the outer cylindrical nitriding layer of all broken oil ring scraping blades;
(3) Reducing the depth of the outer cylindrical nitriding layer of the oil ring scraping blade during preparation on the basis of the depth range of the outer cylindrical nitriding layer of the oil ring scraping blade counted in the step (2);
(4) Testing or observing the matrix hardness, metallographic structure, outer circle nitriding layer depth, nitriding layer brittleness and surface state of fracture after bending of the oil ring scraping blade after the outer circle nitriding layer depth is reduced, and then carrying out bench verification;
(5) Determining the depth range of the outer cylindrical nitriding layer which can meet the use requirement of the oil ring scraping blade according to the test and verification results in the step (4);
(6) And (3) controlling the depth of the outer circle nitriding layer within the depth range of the outer circle nitriding layer determined in the step (5) when the oil ring scraping blade is manufactured.
2. The method of improving the quality of an oil ring wiper blade for an engine of claim 1, wherein in step (1), if the fracture of the oil ring wiper blade originates from the outside, the fracture is flush in section, and the surface micro-topography is edged, the fracture belongs to brittle fracture.
3. The method for improving the quality of the engine oil ring wiper blade according to claim 1, wherein the method for testing the depth of the outer cylindrical nitriding layer is carried out according to the specification in GB/T11354-2005 steel part nitriding layer depth determination and metallographic structure inspection.
4. The method for improving the quality of the engine oil ring scraping blade according to claim 1, wherein in the step (4), a mixed solution consisting of 3.5-4.5 g picric acid, 4.5-5.5 ml hydrochloric acid and 90-110 ml ethanol is adopted as an etchant in a metallographic structure test.
5. The method for improving the quality of the engine oil ring scraping blade according to claim 1, wherein in the step (4), the testing method of the brittleness of the nitriding layer is carried out according to the specification in GB/T11354-2005 steel part nitriding layer depth determination and metallographic structure inspection, and the grade 1-2 is qualified.
6. The method for improving the quality of an engine oil ring wiper according to claim 1, wherein in the step (4), the method for testing or observing the surface state of the fracture after bending is as follows: broken at 180 ° of the opening of the oil ring wiper blade, and the surface state near the broken portion was observed under a magnifying glass.
7. The method of upgrading an engine oil ring wiper according to claim 1, wherein in step (4), the method of stand verification is: and (3) assembling the oil ring scraping blade on an F-type engine, carrying out a 500-hour rated power bench test, disassembling the engine after the test, and observing whether the oil ring scraping blade is normal or not and whether a fracture phenomenon occurs or not.
8. The method for improving the quality of the oil ring wiper of the engine according to claim 1, wherein in the step (5), the hardness of a base body of the oil ring wiper capable of meeting the use requirement is 312 HV-320 HV, a metallographic structure is tempered sorbite and granular carbide, the depth of an outer circle nitriding layer is 0.1-0.3 mm, the brittleness level of the nitriding layer is 1-2, the surface state of a fracture after bending is that no obvious crack exists near the fracture, and the oil ring wiper is not broken normally after bench verification.
9. The method for improving the quality of an oil ring wiper blade of an engine according to claim 1, wherein in the step (3) and the step (6), the nitriding treatment method in the preparation of the oil ring wiper blade is as follows: and (3) filling cracking ammonia gas into an ammonia gas cracking control system for nitriding treatment.
10. The method for improving the quality of the oil ring scraping blade of the engine according to claim 8, wherein in the step (6), an ammonia cracking control system is adopted, cracking ammonia is filled for nitriding treatment at 540+/-10 ℃, and the nitriding treatment time is controlled to be 85-95 min, so that the depth of the nitriding layer of the excircle of the oil ring scraping blade can be controlled to be 0.1-0.3 mm.
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