This standard specifies the terms, symbols, product classification, technical requirements, test methods, acceptance rules and marking, packaging, storage and transportation requirements for cast iron piston rings for reciprocating piston compressors. This standard applies to piston rings with a basic diameter of less than 30 mm and 210 to 1000 mm. Piston rings with a basic diameter of 30 to 200 mm use internal combustion engine piston rings (GB 1149). JB/T 5447-1991 Cast Iron Piston Rings for Reciprocating Piston Compressors JB/T5447-1991 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 5447-1991
Cast iron piston rings for reciprocating piston compressors
Issued on July 22, 1991
Implemented on July 1, 1992 by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Subject content and scope of application
Cited standards
Terms and symbols
Product classification
Technical requirements
Test methods
Inspection rules
Marking, packaging, transportation, storage
Appendix A
Rectangular rings (R rings) with a basic diameter of less than 30 mm and 210~1000 mm (supplement) Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Conical rings (M rings) with a basic diameter of 210~400 mm (supplement) Nose ring (N ring) with a basic diameter of 210~400mm (supplement): Slotted oil ring (S ring) with a basic diameter of 210~400mm (supplement) 13
Oil ring (D ring) and oil ring (G ring) with a basic diameter of 210~400mm (supplement)......17 Helical spring oil ring (GSF ring) with a basic diameter of 210~400mm (supplement):?20
Mechanical Industry Standard of the People's Republic of China
Cast Iron Piston Ring for Reciprocating Piston Compressor
1 Subject Content and Scope of Application
JB/T54471991
This standard specifies the terminology, symbols, product classification, technical requirements, test methods, acceptance rules and marking, packaging, storage and transportation requirements for cast iron piston rings for reciprocating piston compressors (hereinafter referred to as "piston rings or rings"). This standard applies to piston rings with a basic diameter of less than 30mm and 210~1000mm. Piston rings with a basic diameter of 30-200mm use internal combustion engine piston rings (GB1149). 2
Reference standard
GB1149
GB 1182~1184
GB1800~1804
GB2828
GB5612
GB7216
3 Terms and symbols
1 Piston ring terms
Metal Rockwell hardness test method
Metal Brinell hardness test method
Mechanical property test method of gray cast iron parts
Internal combustion engine piston ring
Shape and position tolerance
Tolerance and fit
Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection) Cast iron grade representation method
Gray cast iron metallography
Piston ring: An elastic ring with a large outward expansion deformation, which is assembled into the piston ring groove corresponding to the cross section, and plays the role of sealing and controlling lubricating oil. Piston rings are divided into gas rings and oil rings according to their functions. 3.1.1 Gas ring
Piston ring mainly used to prevent gas leakage through the piston. It forms a seal between the outer surface of the ring and the inner surface of the cylinder, the side of the ring and the ring groove by relying on the pressure difference of the gas during reciprocating motion. 3.1.1.1 Rectangular ring
Gas ring with simple geometric shape and rectangular cross section. It has effective sealing performance under normal working conditions. Conical ring
A rectangular ring with a small angle between the outer surface of the piston ring and the axis. It can achieve the effect of immediate sealing and quick start. Nose ring
Piston ring with a nose-shaped cutter with oil scraping function on the lower edge of the outer surface. It can play the role of a gas ring, but the sealing performance is poor. 3.1.2 Oil ring
Piston ring with oil return hole or equivalent structure to control the lubricating oil on the cylinder wall. 3.1.2.1 Slotted oil ring
An oil ring with parallel sides, two contact ring banks and oil return holes. Due to the narrow ring bank, a high specific pressure can be obtained. Approved by the Ministry of Machinery and Electronics Industry on July 22, 1991 and implemented on July 1, 1992
3.1.2.2 Oil ring with different chamfers
JB/T5447-1991
The outer edges of the outer cylindrical surfaces of the two ring banks are slotted oil rings with different chamfers. To further increase the specific pressure, thereby achieving a better oil scraping effect. 3.1.2.3 Oil ring with same chamfers
The outer edges of the outer cylindrical surfaces of the two ring banks are slotted oil rings with same chamfers. It has a better oil scraping effect. 3.1.2.4 Spiral spring oil ring
Add a spiral spring to the slotted oil ring similar to 3.1.2.1, 3.1.2.2, and 3.1.2.3 to increase the specific pressure of the oil ring. The spring has an equal force on the surface of the ring body.
3.2 Terms and symbols for various parts of piston ring
3.2.1 Free state (non-stress state) (see Figure 1)
3.2.2 Closed state (see Figure 2)
3.2.3 Assembly state of piston ring and ring groove (see Figure 3) 3.2.4 Edge, surface, side (see Figure 4) 3.2.5 Rectangular ring section (see Figure 5)
3.2.6 Nose ring surface (see Figure 6)
3.2.7 Slotted oil ring (see Figure 7)
3.3 Characteristic terms and symbols for piston ring
3.3.1 Elastic force
The tangential force or radial force required to close the piston ring to the specified state (see Figure 8). 2
Yanyi Spotted Cow
Ear Carrying Fence
Renan Room
Basic Link and 4
American Panel Station
JB/T 5447-1991
Korean travel without Kangqi
and the city
demolished the sea and then moved
Victory ceremony Haiti
come to the mouth to welcome the song
open the design product for you
dance Jiangyu
Xinhong acid
open the day on the foreign stable edge
opening ticket report
foreign marriage seat product
in the young
sexual knife diameter d
same oil hole
physical part
oil return hole width C,
fillet radius production
ring rate high h.
3.3.1.1 Tangential elastic force F (N)
JB/T 54471991
The tangential force applied when the ring is tightened with a steel band to make the open end reach the closed gap. 3.3.1.2 Radial elastic force F. (N)
Closed.Home
The radial force applied in the diameter direction at 90° to the open end to keep the ring in the direction of the basic diameter. 3.3.1.3 The conversion formula of tangential elastic force F and radial elastic force F. is: F,=0.465Fa
3.3.2 Light tightness
It is the ability of the outer surface of the piston ring to prevent light from passing through when the piston ring is installed in a cylinder or inspection ring gauge with a diameter equal to the basic diameter of the ring. It is expressed as the percentage of the light-proof length to the circumference of the outer surface of the piston ring. 3.3.3 Average specific pressure
Radial pressure exerted by piston ring on cylinder wall. Calculation formula: 2F
Where: P
Average specific pressure, N/mm:
F—tangential elastic force, N;
h—contact height between piston ring and cylinder inner wall, mm: d—basic diameter of piston ring, mm.
3.3.4 Side surface flatness
When piston ring is placed on the test platform, under the specified test conditions, the maximum axial distance between its lower side and the test platform. 4 Product classification
4.1 See Table 1 for the types of piston rings.
4.2 Rectangular ring cuts have oblique cuts (A type) and straight cuts (B type). Oblique cuts are divided into right oblique cuts (A right) and left oblique cuts (A left) according to their direction.
Other rings only use straight cuts.
Rectangular ring
Conical ring
Nose ring
Slotted oil ring
Opposite chamfer oil ring
Same direction chamfer oil ring
Same direction chamfer
Spiral spring oil ring
JB/T5447-1991
Structural code
Mark "up"
Mark. Up\
1Mark "up"
Mark "up"
4.3 The marking method of piston ring shall comply with the following provisions (marking examples are shown in Appendix A to Appendix E). Piston ring
5 Technical requirements
5.1 General
Standard code
Basic diameter
210~1000
210-400
210~400
210~400
210-400
210-400
Material code: as specified in Table 2. Class I may not mark structural drawings and dimensions
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Appendix E
Appendix F
Cut type: rectangular rings are in accordance with the provisions of Article 4.2, and other rings are not marked. Main dimensions: basic diameter × radial thickness × ring height. Structural code: in accordance with the provisions of Table 1
Piston rings shall be manufactured and accepted in accordance with the provisions of this standard and the product drawings approved by the prescribed procedures. If there are special requirements, they can be negotiated and decided by both the supply and demand parties.
5.2 Materials
5.2.1 The piston ring material is wear-resistant cast iron. Its grade representation method is in accordance with the provisions of GB5612, and the strength index is expressed in bending strength. Example: MTCuMoCr-400
means: wear-resistant cast iron, containing trace amounts of copper (Cu), molybdenum (Mo), chromium (Cr) alloy elements, with a bending strength of 400N/mm2. 5
JB/T 5447-1991
Chemical composition is as specified in the product drawing, and the sulfur content is not more than 0.12%. The classification and performance of piston ring materials shall comply with the provisions of Table 2. The hardness difference on the same ring shall not exceed 4 HRB units, Table 2
Basic diameter
≤600
≤600
≤600
Class 1 materials are sand mold simplified castings,
Average elastic modulus
1.15×105
Not heat treated.
The metallographic structure of the piston ring shall comply with the provisions of Table 3. Table 3
Basic diameter
210~600
250 (Grade 4)
500 (Grade 3)
Structural dimensions and tolerances
Distribution shape
Type A or B
Type and a small amount of E
Type, dispersion
large, uniform
Type E graphite
≤10%
Flexural strength ≥
≤40% (Grade 3)
Number of common product groups
> 520 pieces/cm2
<6% (Grade 4)
Number of product clusters
>390 pieces/cm
Intermittent network
Phosphorus products and ferns
complexes
Small pieces of phosphorus products
complexes are allowed, complex
(mesh diameter
≤600μm)
or evenly distributed
The structural dimensions and tolerances of piston rings shall comply with the provisions of Appendix A ~ Appendix F (supplement) respectively. 5.4 Tangential elastic force The area of ​​carbides in the composite is ≤500um. The length of carbides is not greater than 50μm. Basic structure Pearlite should be trochosite or fine flakes. The spacing between medium flakes should not be greater than level 3, and the ferrite content should not be greater than the area. Free cementite and lysite are not allowed to exist. 5.4.1 When the average elastic modulus E of the piston ring material is 1.0×10'N/mm2, the tangential elastic force shall comply with the requirements of Appendix A to Appendix F (supplement).
When the average elastic modulus E of the piston ring material is 1.10×10° and 1.15X×10°N/mm2, the tangential elastic force shall be 1.1 and 1.15 times the values ​​specified in 5.4.1 and 5.4.2
, respectively.
5.4.3 The limit deviation of the tangential elastic force of the piston ring is 20%. 5.5 Light sealing
The light sealing of the rectangular ring shall not be less than 90%.
The light sealing of the nose ring and the oil ring shall not be less than 85%. Conical rings and
No light leakage is allowed within 15° from the mouth end. 5.6
Surface roughness
The surface roughness of the piston ring shall comply with the provisions of Table 4. 6
Piston ring surface
Surface roughness R value
Side flatness
Inner cylindrical surface
JB/T 5447-1991
Outer cylindrical surface
The side flatness of the piston ring shall meet the 8th grade accuracy of Appendix 1 of GB1184. 5.8
Appearance quality
5.8.1Rust is not allowed on the piston ring surface. Axial scratches are not allowed on both
d,≤600mm
Outer cylindrical surfaces, and radial scratches are not allowed on both sides. wwW.bzxz.Net
d,>600mm
Outer cylindrical edges are not allowed to have gaps, damage or burns. The chipping of the inner cylindrical edges and the oil return hole is not allowed to exceed 0.25mm, and no easy-to-fall-off particles are allowed.
5.9 Casting defects
Casting defects such as cracks, inclusions, and looseness are not allowed on piston rings. The piston ring surface is not allowed to have pores and shrinkage holes exceeding the requirements of Table 5. The range division in the table is shown in Figure 9. Table 5
Basic diameter d,
Pore and shrinkage hole diameter
Outer cylindrical surface
Inner cylindrical surface
Pore and shrinkage hole depth
Number of pores and shrinkage holes
Minimum spacing
Residual magnetism is not allowed on piston rings.
Repair piston rings
210-300
>300~450
>450~650
Not greater than the radius of pores or shrinkage holes
The enlarged value of the basic diameter of repair piston rings shall comply with the requirements of Table 6. 20
>650~1000
The distance between the hole and the edge shall not be less than 0.5mm, and the basic diameter d
210-500
>500~800
>800~1000
Warranty period
JB/T5447-1991
The warranty period of piston rings shall not be less than the replacement period of piston rings specified in the matching compressor. Under normal use, if the user causes damage due to manufacturing quality during the warranty period, the manufacturer shall be responsible for replacement. 6
Test method
6.1 Material
Cutting.
The preparation and test method of bending specimens shall comply with the provisions of GB977. The cutting, preparation and evaluation of metallographic samples shall be in accordance with the provisions of GB7216. The samples can also be made on the processed piston rings. The hardness test shall be carried out on the finished piston rings. The test method shall comply with the provisions of GB230 and GB231. 6.2 Structural dimensions
6.2.1 The ring height and radial thickness shall be measured with an outside micrometer at four evenly distributed positions of the piston ring. The probe of the micrometer used to measure the radial thickness shall be a spherical probe.
6.2.2 Other dimensions shall be measured with a vernier caliper. 6.3 Light tightness and closed gap
6.3.1 Light tightness The piston ring is installed in the inspection ring gauge, the light source is placed 100mm behind the ring, and visual inspection is performed in the direction parallel to the axis (Figure 10). The piston ring is allowed to rotate in the ring gauge to eliminate any slight surface roughness on the outer cylindrical surface of the ring. The illumination of the light source shall be 400~1500Lx higher than the ambient conditions. Point-shaped and blurred light is still considered to be light-tight. Figure 10
Closed gap Install the piston ring into the inspection ring gauge and check with a feeler gauge. The inner diameter tolerance of the inspection ring gauge is H6 of GB1801~1802, and the roundness tolerance is Grade 6 of Appendix 2 of GB1184. Surface roughness of the inner circle: when d,≤600mm, it is R.0.8um; when d,>600mm, it is R,1.6μm. 6.4 Tangential elastic force
JB/T5447-1991
Wrap the piston ring with a flexible steel belt with a thickness of 0.08~0.10mm and a width not greater than the ring height. The two ends of the steel belt are each wound around a roller with a distance of 20mm and a diameter of 10mm. Tighten the steel belt to shrink the piston ring until the open end contacts, and then loosen it to the closed gap. Read the tangential elastic force value from the precision dynamometer. The center of the open end of the piston ring should be at the symmetric center of the two rollers (Figure 11). The radial elastic force Fa can also be measured on a special instrument for measuring radial elastic force and converted according to formula (1). 6.5 Side surface flatness
6.5.1 Place the piston ring on the inspection platform, evenly add 10 piston rings of the same specification on it, and use a feeler gauge or other instrument to measure the gap between the lower side of the piston ring and the inspection platform. 6.5.2 The flatness accuracy of the inspection platform should be 2 levels higher than that of the inspected piston ring. Inspection rules
7.1 Each piston ring must be inspected and qualified by the inspection department of the manufacturer before it can be shipped. 7.2 Material inspection
7.2.1 The inspection of piston ring materials should be carried out in batches. Castings of the same heat (or the same package) and the same specification are a batch, and each batch of bending specimens shall not be less than 3 pieces.
7.2.2 During the inspection, first take one bending specimen for bending test and metallographic test, and take one piston ring for hardness test. If one item does not meet the requirements, take another two specimens to repeat the same test. If one still does not meet the requirements, the batch of castings is unqualified. 7.2.3 For piston rings with a basic diameter greater than or equal to 400mm, the hardness test can be carried out on three bending specimens. If the requirements are met, the hardness is qualified. If the requirements are not met, take the piston ring body as a sample and re-test it according to the provisions of Article 7.2.2. 7.3 When the ordering unit accepts the product quality, it shall be carried out in accordance with the provisions of GB2828. The sampling frequency plan and the quality inspection level AQL value shall be negotiated and determined by the supply and demand parties.
8 Marking, packaging, transportation, storage
8.1 Each piston ring must be cleaned and coated with rust inhibitor before packaging, wrapped with impermeable materials, and grouped with strong materials, and then labeled.
8.2 Each group of products shall be accompanied by a product certificate signed and stamped by the manufacturer's technical inspector. 8.3 The label shall indicate:
Manufacturer name, trademark and address:
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