This standard specifies the structural dimensions, technical requirements, test methods, inspection rules, packaging and transportation of sealed crawler track links for crawler bulldozers. This standard applies to combined sealed crawlers of JB/T 5932.1. JB/T 5932.2-1991 Crawler bulldozer sealed crawler track links JB/T5932.2-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Crawler Bulldozer
Sealed Track Link
Subject Content and Scope of Application
JB/T5932.291
This standard specifies the structural dimensions, technical requirements, test method inspection rules, packaging and transportation of the sealed track link (referred to as track link) for crawler bulldozers.
This standard applies to the combined sealed crawler track of JB/T5932.1. 2 Reference standards
Sealed crawler track assembly of crawler bulldozer
JB/T5932.1
GB5617
JB2641
ZBJ04006
GB3077
3 Structural dimensions
3.1 Structural dimensions
Metal Brinell hardness test method
Metal Rockwell hardness test method
Determination of effective hardened layer depth after induction quenching or flame quenching of steelMetallographic inspection of induction quenching parts of automobiles
Metal tensile test method
Metal Charpy (U-notch) impact test methodMagnetic particle inspection method for steel materials
Technical conditions for alloy structural steel
The main dimensions of the track section shall comply with the requirements of Figure 1 and Table 1. Hunter Special Vehicle
3, right track link
1991-12-17 approved by the Ministry of Machinery and Electronics Industry 8
5 as the moving width of the media
b, in the track link
1992-07-01 implementation
Marking Example
Right track link with pitch t=228.6mm:
JB/T5932.2—91
Right track link 228.6JB/T5932.2—91
Note: The names in the mark are divided into left track link and right track link. 4 Technical requirements and test methods
(reference)
The track link is made of 40Mn2H or 35GMoA of GB3077, or other materials that meet the requirements of Table 2. The heat treatment requirements and mechanical properties of the track link shall comply with the provisions of Table 2. Table 2
Core hardness
Surface hardness
Effective rail surface
Deep hardened layer
Surface hardness
BB, CC, DD
AA, EE
AA, BB,bZxz.net
CD-D, EE
Metallurgical structure of rail surface hardened layer
Tensile strength
Use strength
Elongation
Impact toughness|| tt||≥225HB
Technical requirements
Test method
≥255HB
331~375HB
50~58HRC
≥285HB
Grade 3~7 (no free ferrite)
≥932N/mm
≥785N/mm
≥29J/cm2
≥34 J/em
GB5617
JB2641
Measurement location
See Figure 3
See Figure 2× on the rail surface (11 measuring points)
See Figure 2
0.5~3mm away from the rail surface
See Figure 3
JB/T5932.2-91
Tensile test specimen
Strike test specimen (sampling size 11×1×55) Figure 3
Core hardness measurement location
Degree measurement location
4.3 There shall be no cracks in the chain rail section, and the magnetic particle inspection method (ZBJ04006) or other methods can be used for inspection. 4.4. The surface roughness parameter R. of the sealing groove is 3.2um; the surface roughness parameter R. of the track shoe mounting contact surface, pin shaft hole and pin sleeve hole is 6.3μm.
5 Inspection rules, packaging and transportation
3B/T5932.2-91
5.1 The date, classification and qualified quality level (AQL) of the factory sampling inspection items shall be in accordance with the provisions of Table 3. The sampling inspection plan shall be in accordance with Article 6.1.2 of JB/T5932.1. The type inspection rules shall be in accordance with Article 6.2 of JB/T5932.1. Table 3
Surface hardness
Aperture D
Screw hole position size
Other dimensions
5.2 The chain track section shall be firmly tied when shipped, and measures shall be taken to prevent rust and collision of each hole. Other packaging and transportation requirements shall comply with the provisions of Articles 7.2 to 7.6 of JB/T5932.1.
Additional Notes:
This standard was proposed and managed by Tianjin Engineering Machinery Research Institute. This standard was drafted by Tianjin Engineering Machinery Research Institute. The main drafter of this standard was Hao Runcai.
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