This technical requirement specifies the technical requirements for the manufacturing, installation and inspection of the steel structure high-strength bolt auxiliary connectors of mobile machinery and equipment. The content not specified in this technical requirement shall be implemented in accordance with relevant national standards. This technical requirement applies to mobile mechanical steel structures that need to be connected by high-strength bolts.
Joint surface treatment
(1) Friction type high-strength bolt connection requires close contact with the joint surface at the joint and sufficient friction coefficient. When the design drawing does not specify the treatment requirements of the joint surface, the treatment shall be carried out according to the following regulations: sandblasting or shot blasting the high-strength bolt joint surface to remove rust, oil and other impurities on the surface to reach the Sa2.5 level standard , The roughness is 50~75μm, and the friction coefficient shall not be lower than 0.40. When there are provisions in the drawings, follow the provisions of the drawings.
(2) After treatment, the friction surface of the high-strength bolt connection should be protected from dirt and oil. It is strictly forbidden to make any mark on the friction surface of the high-strength bolt connection. It is necessary to prevent contamination of the connecting surface during storage in the factory, or during transportation or storage at the installation site. The installation unit should pay special attention to the cleanliness of the connection surface of the connection plate of the high-strength bolt and the parent body and the characteristics of the friction surface. It is not allowed to use a grinder to polish the connecting surface of the connecting plate and the connecting surface of the mother body.
The Ways Of Delivery CargosJune 30, 2022There are many ways to transport goods in foreign trade, mainly including ocean transport, railway transport, air transport, river transport, postal transport, road transport, pipeline transport, land...view
The Process of the Drum flangeMay 26, 2023The production process is mainly divided into forging, casting, cutting, rolling these four kinds. (1) Casting flange and forging flangeCasting out of the flange, blank shape size is accurate, process...view
The End Of National HolidayJune 30, 2022After our long National Holiday (form Oct, 1st to Oct, 7th), our sales person are already back to their work.Welcome to every customer send the inquries to us, we are pleasure to provide services.The ...view
How To Inspect The Thread Quality Of The Steel Drum Closure? Have You Done It?July 1, 2022If it is to detect the external thread, you need to use a ring gauge to measure it. The so-called ring gauge is just like a nut, but this ring gauge is a set of two, one larger and one smaller, to det...view
ICRA: China's Removal Of Export Tax Rebate Is Good For Indian Steel MillsJune 30, 2022China's export rebate cancellation on 126 steel products will slow the pace of Chinese steel exports and benefit Indian steel mills, says credit rating agency ICRA.China's steel exports rose 2...view
Issuing Of The Latest Standards For SprayingJuly 4, 2022Since February 1, 2021, will formally begin to implement the national standard "low volatile organic matter content coating product technical requirements", to the industrial protection of w...view
EN
ko 
fr 
de 
es 
it 
ru 
pt 
ar 
vi 
th 
