This standard specifies the technical requirements, inspection methods, inspection rules and marking, packaging, transportation and storage of single-cylinder diesel engine flywheels. NY/T 511-2002 Single-cylinder diesel engine flywheel NY/T511-2002 Standard download decompression password: www.bzxz.net

Agricultural Industry Standard of the People's Republic of China
NY/T511-2002
Flywheel of single-cylinderdiesel engine
Flywheel of single-cylinderdiesel engine2002-01-04Promulgated
Implementation on 2002-02-01
Promulgated by the Ministry of Agriculture of the People's Republic of China
NY/T511—2002
This standard is proposed by the Agricultural Mechanization Management Department of the Ministry of Agriculture.
This standard is under the jurisdiction of the Agricultural Mechanization Sub-Technical Committee of the National Agricultural Machinery Standardization Technical Committee. The drafting units of this standard are: Agricultural Machinery Parts Quality Supervision, Inspection and Testing Center of the Ministry of Agriculture (Changchun), and Zhaiqiao Branch of Changchai Group. The main drafters of this standard are: Li Li, Huang Mei, Jia Junjie, Ren Quanping, Zhou Mingxin, and Li Longchun. 1 Scope
Agricultural Industry Standard of the People's Republic of China
Flywheel of single-cylinder diesel engineNY/T5112002
This standard specifies the technical requirements, inspection methods, inspection rules and marking, packaging, transportation and storage of flywheels of single-cylinder diesel engines. This standard applies to flywheels of single-cylinder diesel engines with a cylinder diameter less than or equal to 150mm (hereinafter referred to as flywheels). 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T197—1981
Tolerances and fits of common thread (diameter 1355mm)GB/T231--1984
GB/T1031—1995
Metal Brinell hardness test method
Surface roughness parameters and their values
GB/T1095-1979
Cross-sectional dimensions of flat keys and keyways
GB/T1184--1996
GB/T1801—1999
GB/T2828—1987
GB/T 6414-1999
GB/T7216—1987
GB/T7233—1987
GB/T 9439—1988
Tolerances of shape and positionUnmarked tolerance values
Limits and fitsTolerance bands and selection of fitsBatch inspectionCount sampling procedures and sampling tables (applicable to inspection of continuous batches)Dimensional tolerances and machining allowances of castings
Gray cast iron metallography
Ultrasonic flaw detection and quality rating standards for steel castingsGray cast iron parts
JB/T5184—1991wwW.bzxz.Net
Test method for overspeed of flywheels and clutches for tractorsJB/T 7945--1999
9Test method for mechanical properties of gray cast iron
3 Technical requirements
3.1 The flywheel shall be manufactured according to the product drawings and technical documents approved by the prescribed procedures. 3.2 The flywheel material shall be HT200 gray cast iron specified in GB/T9439. Other materials with mechanical properties not lower than HT200 are allowed to be used for manufacturing.
3.3 The hardness of the flywheel is 150~240HBS, and the hardness difference of the same flywheel should not exceed 40HBS. 3.4 Metallographic microstructure
3.4.1 The metallographic microstructure of HT200 gray cast iron material shall meet the following requirements specified in GB/T7216: a) The graphite distribution shape is type A, and type A, type B and a small amount of type C graphite distribution shapes are allowed to exist; b) The graphite length is 4 to 8 levels;
c) The number of pearlite is 1 to 4 levels;
d) The number of phosphorus eutectics is 1 to 2 levels.
Approved by the Ministry of Agriculture of the People's Republic of China on January 4, 2002, and implemented on February 1, 2002
NY/T511—2002
3.4.2 The metallographic microstructure of other materials shall meet the relevant standards. 3.5 The tolerance of the basic dimensions of the casting (including machining allowance and process addition) shall meet the tolerance grade 10 in GB/T6414. 3.6 Casting quality
3.6.1 The surface of the casting shall be free of sand, burrs, flash and seams. 3.6.2 The casting shall not have looseness, shrinkage, slag inclusions, cracks or other casting defects that reduce the structural strength of the casting or affect cutting and positioning clamping.
3.6.3 The taper hole, screw hole and key shall not have any casting defects. The remaining surfaces are allowed to have a single pore, with a hole diameter of no more than 3mm, a hole depth of no more than 2mm, a hole spacing of no less than 10mm, and a hole margin of no less than 5mm. The number of pores on the machined surface shall not exceed 6, and the number of pores on the unmachined surface shall not exceed 9.
3.7 Appearance quality
3.7.1 The machined surface shall not have any scratches, bruises or rust. 3.7.2 After the casting is shot blasted or sandblasted and inspected, anti-rust paint shall be evenly applied on the non-machined surface in time. The paint layer shall not have flow marks or exposed bottom.
3.8 Dimensional tolerances of the main machined parts of the flywheel 3.8.1 The dimensional tolerances of the flywheel generator shall comply with the 8th grade precision specified in GB/T1801. 3.8.2 The dimensional tolerances of the pulley shall comply with the 9th grade precision specified in GB/T1801. 3.8.3
The dimensional tolerances of the keyway width shall comply with the 9th grade precision specified in GB/T1095. 3.9 The thread precision of the connection with the pulley shall comply with the 6th grade precision specified in GB/T197. 0 The dimensional accuracy of the flywheel taper hole shall comply with the requirements of the product drawing, and the degree of fit of the taper hole fitting surface shall not be less than 70%. 3.10
The shape and position tolerances of the flywheel shall comply with the provisions of GB/T1184. The position tolerances of its main processing parts are shown in Table 1. Table 1 Shape and position tolerances
Coaxiality of the axis of the rotating surface of the flywheel generator inner hole to the axis of the tapered holeCoaxiality of the axis of the rotating surface of the pulley to the axis of the tapered holeCircular runout of the two ends of the flywheel rim facing the axis of the tapered holeCircular runout of the outer circle of the flywheel to the axis of the tapered hole
Symmetry of the keyway to the axis of the tapered hole
Tolerance grade
The surface roughness parameter values ​​of various parts of the flywheel shall comply with the provisions of GB/T1031. Surface roughness parameter R, value see Table 2.3.12
Table 2 Surface roughness
Conical hole surface
Keyway side
Flywheel end face
External cylindrical surface matching with flywheel generator
Spigot inner hole surface matching with flywheel pulleyNon-machined surface
Surface with factory trademark
3.13 The flywheel shall be subjected to static balance test, and the unbalanced torque shall comply with the provisions of the product drawing. Surface roughness parameter R. Value
3.14 The flywheel shall be marked with the top dead center, valve timing, oil supply angle and rotation direction, etc. Each mark shall be clear and its position shall comply with the provisions of the product drawing.
NY/T511-2002
3.15 When the flywheel is subjected to the overspeed test, the overspeed safety factor shall not be less than 2.5.4 Inspection method
4.1 Tensile strength
4.1.1 The test bar for inspection shall be selected from the same cast batch as the flywheel, and the single cast test bar with a diameter of 30mm shall be used and cut before the tensile strength test. If necessary, the sample can be cut from the flywheel body for tensile strength test. 4.1.2 The test method shall be in accordance with JB/T7945. 4.2 Hardness
4.2.1 The hardness test shall be carried out on the flywheel body. 4.2.2 The test method shall be in accordance with GB/T231. 4.3 Metallographic microstructure
4.3.1 The sampling position shall be in accordance with GB/T7216 and the test shall be carried out on the tensile test sample. 4.3.2 Inspection methods shall be in accordance with GB/T7216. 4.4 Cracks
Ultrasonic inspection shall be carried out in accordance with GB/T7233. 4.5 Casting quality and appearance quality shall be inspected by visual inspection. 4.6 Dimensional accuracy shall be measured by general and special measuring tools. 4.79
Thread accuracy shall be checked by thread gauge.
4.8 Dimensional accuracy of dimensional holes and taper hole fitting surface shall be measured by special plug gauge and coloring method. 4.9 Surface roughness inspection shall be carried out by surface roughness measuring instrument or surface roughness comparison sample. 4.10
Static balance test shall be carried out on static balance test machine or mechanical balance frame. 4.11
Overspeed test shall be carried out in accordance with JB/T5184. 5 Inspection rules
5.1 Flywheel shall be inspected and qualified by the quality inspection department of the manufacturer before it can be shipped out of the factory. 5.2 Product inspection is divided into factory inspection and type inspection. 5.3 Factory Inspection
5.3.1 Each batch of products shall be subject to factory inspection, and the factory inspection items shall be carried out in accordance with the contents of 3.2 to 3.14. 5.3.2 The sampling inspection plan for flywheels shall comply with the provisions of GB/T2828. 5.3.3 Classification of non-conformities
Any quality characteristic of the inspected product that does not meet the requirements of the standard or drawing is called non-conformity. Generally, non-conformities are divided into Class A non-conformity, Class B non-conformity, and Class C non-conformity according to the severity of the non-conformity of the quality characteristics. Class A non-conformity: The extremely important quality characteristics of the product do not meet the requirements. Class B non-conformity: The important quality characteristics of the product do not meet the requirements. Class C non-conformity: The general quality characteristics of the product do not meet the requirements. The non-conformity classification of flywheel products is shown in Table 3.
5.3.4 AQL value of qualified quality level
AQL values ​​are specified for flywheel products according to the non-conformity classification (see Table 4). If the user has other requirements for the AQL value, it shall be determined by negotiation between the supply and demand parties.
5.3.5 Sampling method
A normal inspection sampling plan is adopted (see Table 4). The values ​​of A. (qualified judgment number) and R. (unqualified judgment number) in the table are calculated by the point method.
Unqualified classification
Unqualified classification
Number of items
Inspection level
Sample code
Number of samples (n)
Qualified judgment
NY/T511—2002
Table 3 Flywheel product quality characteristics Unqualified item classification Quality characteristics
Tensile strength
Metallographic microstructure
Hardness and hardness difference
Static balance test
Thread accuracy
Accuracy of tapered hole size and degree of fit of tapered hole fitting surface Keyway width dimensional tolerance
Symmetry of keyway to tapered hole axis
Surface roughness of tapered hole
Flywheel mark
Matching dimensional tolerance with flywheel generator|| tt||Coaxiality of the axis of the rotating surface matching the inner hole of the flywheel generator with the axis of the tapered holeCircular runout of the two end surfaces of the flywheel rim with the axis of the tapered holeCircular runout of the outer circle of the flywheel with the axis of the tapered hole
Dimensional tolerance for matching with the pulley
Coaxiality of the axis of the rotating surface matching the pulley with the axis of the tapered holeSurface roughness of the keyway
Surface roughness of the two end surfaces of the flywheel
Surface roughness of the non-machined surface
Quality of castings
Appearance quality
Table 4 Sampling plan for normal inspection of flywheel productsA
5.3.6 Inspection batch
NY/T511—2002
Specifies that the inspection batch n is 51 to 90 pieces. The products to be inspected are divided into several batches of 51 to 90 pieces, and one batch is randomly selected for sampling inspection. 5.3.7 Inspection level
Special inspection level S-1 shall be adopted for A1 and B1 non-conformities, and general inspection level I shall be adopted for A2, B2 and C non-conformities. 5.3.8 Implementation of sampling plan
Samples shall be drawn from the recent qualified products in the human library or the self-inspection on the production line, and the provisions of 5.3.6 shall be implemented. If they are drawn from the user unit or the distribution department, they may not be restricted by the lower limit of the batch range. Samples are randomly drawn. 5.3.9 Determination of qualified batches
Samples shall be classified according to the non-conformity in Table 3 and inspected according to the provisions of Chapters 3 and 4. After all samples are inspected, if the number of non-conformities in the sample is less than or equal to the A value, the class is judged as qualified: when the number of non-conformities is greater than or equal to the R value, the class is judged as unqualified. When all customer classes are judged as qualified, the batch of products is judged as qualified. When any of the classes is judged as unqualified, the batch of products is judged as unqualified. 5.4 Type inspection
5.4.1 Type inspection shall be conducted in the following cases: - new product testing (identification);
product design, process, important structure, material, etc. have major changes that affect product performance; - periodic inspection after batch production;
- factory inspection results are significantly different from the last type inspection. 5.4.2 During type inspection, first conduct inspection according to the provisions of 5.3. After passing the inspection, four flywheels are selected, two of which are tested for reliability with the main engine, and the other two are tested for overspeed. If one of the reliability assessment and overspeed test fails, the type inspection is judged to be unqualified. 6 Marking, packaging, transportation, storage
6.1 Each flywheel shall be marked with the factory mark, and the location, size and method of marking shall be in accordance with the product drawings. 6.2 The flywheel shall be accompanied by the manufacturer's product quality certificate when leaving the factory. The product quality certificate should indicate: a) manufacturer name and address; b) product name and model; c) inspector's signature; d) inspection date; e) implementation standard code. 6.3 The flywheel cone hole and other parts should be oil-sealed or treated with other anti-rust treatments, and packed in a packaging box. Other packaging methods can also be used after consultation with the user. 6.4 The outer surface of the packaging box should at least indicate: a) manufacturer name and address; b) product name and model; c) quantity, net weight, gross weight, and overall dimensions; d) packing date; e) "handle with care" and "moisture-proof" signs. 6.5 The flywheel should be protected from strong collisions during transportation and loading and unloading. 6.6 The flywheel should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the flywheel will not rust within 12 months from the date of leaving the factory.1 Type inspection should be carried out when the following situations occur: - New product testing and finalization (identification);
Product design, process, important structure, materials, etc. have major changes that affect product performance; - Periodic inspection after batch production;
- Factory inspection results are significantly different from the last type inspection. 5.4.2 During type inspection, first conduct inspection according to the provisions of 5.3. After passing the inspection, four flywheels are selected, two of which are tested for reliability with the main engine, and the other two are tested for overspeed. If one of the reliability assessment and overspeed test fails, the type inspection is judged to be unqualified. 6 Marking, packaging, transportation, storage
6.1 Each flywheel should be marked with the factory mark, and the location, size and method of marking shall be as specified in the product drawing. 6.2 The flywheel should be accompanied by the manufacturer's product quality certificate when leaving the factory. The product quality certificate should indicate: a) manufacturer name and address; b) product name and model; c) inspector's signature; d) inspection date; e) implementation standard code. 6.3 The flywheel cone hole and other parts should be oil-sealed or treated with other anti-rust treatments, and packed in a packaging box. Other packaging methods can also be used after consultation with the user. 6.4 The outer surface of the packaging box should at least indicate: a) manufacturer name and address; b) product name and model; c) quantity, net weight, gross weight, and overall dimensions; d) packing date; e) "handle with care" and "moisture-proof" signs. 6.5 The flywheel should be protected from strong collisions during transportation and loading and unloading. 6.6 The flywheel should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the flywheel will not rust within 12 months from the date of leaving the factory.1 Type inspection should be carried out when the following situations occur: - New product testing and finalization (identification);
Product design, process, important structure, materials, etc. have major changes that affect product performance; - Periodic inspection after batch production;
- Factory inspection results are significantly different from the last type inspection. 5.4.2 During type inspection, first conduct inspection according to the provisions of 5.3. After passing the inspection, four flywheels are selected, two of which are tested for reliability with the main engine, and the other two are tested for overspeed. If one of the reliability assessment and overspeed test fails, the type inspection is judged to be unqualified. 6 Marking, packaging, transportation, storage
6.1 Each flywheel should be marked with the factory mark, and the location, size and method of marking shall be as specified in the product drawing. 6.2 The flywheel should be accompanied by the manufacturer's product quality certificate when leaving the factory. The product quality certificate should indicate: a) manufacturer name and address; b) product name and model; c) inspector's signature; d) inspection date; e) implementation standard code. 6.3 The flywheel cone hole and other parts should be oil-sealed or treated with other anti-rust treatments, and packed in a packaging box. Other packaging methods can also be used after consultation with the user. 6.4 The outer surface of the packaging box should at least indicate: a) manufacturer name and address; b) product name and model; c) quantity, net weight, gross weight, and overall dimensions; d) packing date; e) "handle with care" and "moisture-proof" signs. 6.5 The flywheel should be protected from strong collisions during transportation and loading and unloading. 6.6 The flywheel should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the flywheel will not rust within 12 months from the date of leaving the factory.
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