This standard specifies the main dimensions, technical requirements, test methods, inspection rules, packaging, transportation and storage of wetland bulldozer track shoes (hereinafter referred to as track shoes). This standard is applicable to wetland bulldozer track shoes with rated power 74^-173kW <100-230 horsepower). Other wetland crawler engineering machinery track shoes can also be used for reference. JB/T 7312-1994 Wetland Bulldozer Track Shoes JB/T7312-1994 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T7312-94
Track Shoes for Wetland Bulldozers
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implemented on July 1, 1995
Mechanical Industry Standard of the People's Republic of China
Track Shoes for Wetland Bulldozers
Subject Content and Scope of Application
JB/T7312-94
This standard specifies the main dimensions, technical requirements, test methods, inspection rules, packaging, transportation and storage of track shoes for wetland bulldozers (hereinafter referred to as track shoes).
This standard is applicable to track shoes for wetland bulldozers with rated power of 74 to 173 kW (100 to 230 horsepower), and other crawler-type engineering machinery track shoes can also be used for reference. Cited standards
JB/T5939
JB/T5936
JB/T5944
JB/T5946
Main dimensions
Metal tensile test method
Metal Charpy (U-notch) impact test methodMetal Brinell hardness test method
Microscopic determination method of non-metallic inclusions in steel
General technical conditions for steel castings for engineering machinery
Engineering machinery
Engineering machinery
Engineering machinery
General technical conditions for machined parts
General technical conditions for heat treated parts
General technical conditions for painting
The main dimensions of the track shoe shall comply with the requirements of Figure 1 and Table 1. Impact test parts
Micro and hardness test by the Ministry
Approved by the Ministry of Machinery Industry on July 18, 1994
Main dimensions and test parts of wetland bulldozer track shoes Implemented on July 1, 1995
4 Technical requirements
JB/T 731294
Main dimensions of track shoes
Track shoes should be manufactured in accordance with the product drawings, technical documents approved by the prescribed procedures and the provisions of this standard. 4.1
4.2 ZG43SiMnH material is recommended for track shoe steel, and other materials with mechanical properties not lower than those of the above grade are also allowed to be used as substitutes. 4.3 The carbon content of track shoe steel should be in the range of 0.35%~0.50%, its silicon content should be 0.3%~0.8%, and its manganese content should be 0.7%~1.4%. The sulfur and phosphorus contents should be less than 0.04%. The content of non-metallic inclusions, pickled and plastic inclusions in dyed steel shall comply with the relevant provisions of YB25.
4.4 The mechanical properties and heat treatment requirements of the track plate shall comply with the provisions of Table 2. Table 2 Mechanical properties and heat treatment requirements of track plates Tensile strength.
Yield strength.
N/rnma
Impact toughness α
4.5 The casting of the track plate shall comply with the relevant provisions of JB/T5939, surface hardness
201~341
Hard depth
4.6 The machining of the track plate shall comply with the relevant provisions of JB/T5936, and the symmetry of its dimensions D, E, F to the datum A and B shall comply with the drawing tolerance requirements.
4.7 The heat treatment of the track plate shall comply with the relevant provisions of JB/T5944. 4.8 The painting of the track plate shall comply with the relevant provisions of JB/T5946. 4.9 The unfilled corners of the track plate are R3~5mm. The casting surface is not allowed to have sand holes, shrinkage, cracks and any defects that affect the strength. The flatness error of the two main outer sides of the V-shaped should be within 3mm. Annealing should be performed after casting. The finished track plate should be inspected by flaw detection and cracks are not allowed. 4.10
5 Test method
5.1 Tensile test
The tensile test of the finished track plate shall be carried out in accordance with the provisions of GB228. The sample size is 22×150mm (the middle section is 14×50mm), and it is allowed to make another sample with the same furnace and heat treatment material. 5.2 Impact test
The impact test of the finished track plate shall be carried out in accordance with the provisions of GB229. The sampling position is shown in Figure 1. The sample size is 10mmX10mmX55mm), the U-shaped cut is in the center of 55mm, and the secondary mouth direction is downward. When the size of the finished product sampling area is not enough, it is allowed to make another sample with the same furnace and heat treatment material.
5.3 Hardness test
The hardness test of the track shoe shall be carried out in accordance with the provisions of GB231. The test area of ​​the surface hardness is shown in Figure 1, and the hard layer depth is tested on the M-M section.
5.4 Microscopic test
The non-metallic inclusion test of the track shoe shall be carried out in accordance with the regulations of YB25. The sample surface size is 15mm×20mm, and the location is shown in Figure 2
1. It is allowed to make another sample with the same furnace and heat treatment material. 5.5 Flaw detection test
JB/T 7312-94
The finished track plate is not allowed to have any cracks. It should be subjected to explicit magnetic particle flaw detection and demagnetization treatment. 6 Inspection rules
6.1 The dimensional accuracy, surface roughness and appearance quality of the track plate shall be inspected by the quality inspection department of the manufacturer in accordance with the product drawings and the provisions of this standard, and a certificate of conformity shall be issued.
6.2 The surface heat treatment hardness of the track plate is specified to be randomly sampled for 7 pieces per batch, and 4 points of each piece shall be randomly measured in the measuring point area within 30mm of the center line. If at least 3 of the 4 points are within the specified range, the hardness of the piece is evaluated as qualified; if more than 6 of the 7 pieces sampled meet the qualified requirements, the batch of hardness is judged to be qualified. If the sampling results do not meet the requirements, it will be changed to piece by piece inspection, and those that do not meet the indicators will be judged as scrap. The depth of the hard layer is checked at random every 3 months. The depth must be qualified. If it is unqualified, double sampling is conducted. All the indicators must be qualified, otherwise the batch will be treated as scrap.
6.3 The finished product tensile, impact and microscopic tests are randomly sampled once a year, and all indicators must be qualified. 6.4 The finished product flaw detection test should be carried out piece by piece, and cracks are judged as scrap. 6.5 The instruments and measuring tools used for various inspections should be calibrated regularly. 7 Packaging, transportation and storage
7.1 Before packaging, dirt and chips should be removed, the surface should be painted, and after being tied firmly, it should be packed in a packaging box with moisture-proof paper, and it is required that the crawler plate will not be damaged during normal transportation. The weight of a single box shall generally not exceed 60kg. 7.2 The packaging box should be accompanied by a certificate signed by the quality inspector of the manufacturer, and the name and model of the product should be indicated. 7.3 The following information should be marked on the packing box: wwW.bzxz.Net
Product name and model;
Manufacturer name or trademark;
Product specifications and quantity:
Net weight:
Date of export.
7.4 Track shoes should be placed in a dry and ventilated warehouse after packing. Under normal circumstances, they should not rust within one year from the date of shipment. Additional remarks:
This standard was proposed and managed by Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Tianjin Engineering Machinery Research Institute. The main drafter of this standard is Li Mingxiang.
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