This standard is based on the JB/T 3823-1984 "Automotive Coil Spring Technical Conditions", JB/T 3824-1984 "Automotive Coil Spring Bench Test Method" based on the re-enactment. The above two standards were repealed in 1999. This standard compared with JB/T 3823-1984 "Automobile coil spring technical conditions", JB/T 3824-1984 "Automobile coil spring bench test method" compared to the main changes are as follows:
Reference Standard:
Hardness and decarburization were specified:
The specific provisions for the surface corrosion test were as follows:
The product sampling method was specified:
Description of verticality:
The pitch uniformity was specified:
End ring diameter tolerance.
This standard was proposed by the China National Machinery Industry Federation. This standard was drafted by the National Spring Standardization Technical Committee (SAC/TC235). This standard was drafted by: China Spring Factory, Guangzhou Huade Automobile Spring Co., Ltd., Shandong Lianmei Automobile Spring Co., Ltd., Zhuji Jinbao Automobile Spring Manufacturing Plant The main drafters of this standard are: Jiang Yan, Long Aihua, Yang Weiming, Liu Cuiling, and Jin Guoxiang.
Reference Standard:
Hardness and decarburization were specified:
The specific provisions for the surface corrosion test were as follows:
The product sampling method was specified:
Description of verticality:
The pitch uniformity was specified:
End ring diameter tolerance.
This standard was proposed by the China National Machinery Industry Federation. This standard was drafted by the National Spring Standardization Technical Committee (SAC/TC235). This standard was drafted by: China Spring Factory, Guangzhou Huade Automobile Spring Co., Ltd., Shandong Lianmei Automobile Spring Co., Ltd., Zhuji Jinbao Automobile Spring Manufacturing Plant The main drafters of this standard are: Jiang Yan, Long Aihua, Yang Weiming, Liu Cuiling, and Jin Guoxiang.
Downhole tools for oil rigs include: stabilizers, scrapers, centralizers, etc.
The replaceable sleeve stabilizer are available with two-piece and three-piece construction. The three-piece construction stabilizer is made of a body and a centralizing body(refer to sleeve replaceable). The advantage is that the sleeve can be changed quickly and easily after sleeve hardfacing is worn-out. This kind of stabilizer is especially suitable for working in directional well .
Downhole Drilling Tools,Drilling Tools,Oil Production Tools,Downhole Auxiliary Tools
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