Structure And Standard Of Sleeve Roller Chain For CNC Machine Tools


1.The structure of the sleeve roller chain of the CNC machine tool

The structure of the sleeve roller chain of the CNC machine tool is composed of an inner chain plate 1, an outer chain plate 2, a pin shaft 3, a sleeve 4, and a roller 5. The cooperation relationship between CNC machine tool parts is: interference fit between the inner chain plate and the sleeve, between the outer chain plate and the pin; between the roller and the sleeve, between the sleeve and the pin, using clearance fit , which constitutes a hinge, so that the inner and outer chain plates can rotate relative to each other. The roller looper of the CNC machine tool can reduce the friction and wear between the chain and the sprocket and improve the service life. In order to reduce the wear of gear teeth in CNC machine tools, there is a small gap between the inner and outer chain plates, so that the lubricating oil can penetrate into the friction surface between the sleeve and the pin shaft. In order to reduce the mass of the chain and make the tensile strength of each cross-section of the chain approximately equal, the inner and outer chain plates are usually made into a “…

The center distance of two adjacent pin shafts on the CNC machine tool chain is called the pitch of the chain, which is represented by p, which is one of the main parameters of the chain drive. When the transmission power of the CNC machine tool is large, a chain with a larger pitch or a multi-row chain can be used. The more the number of rows, the stronger the bearing capacity, but if the number of rows is too large, the higher the requirements for manufacturing accuracy and assembly accuracy, and the load of each chain row is not easy to be evenly distributed. Therefore, in practical applications, there are generally 4 rows at most, and double-row chains are more commonly used.
When the number of chain links is even, the two ends of the chain are just connected with the outer chain plate and the inner chain plate, which can be fixed by spring card or cotter pin here. CNC machine tools generally use journals and pitches for the former, and the latter for large pitches; when the number of chain links is odd, transition links are required, and the chain plates of the transition links are subject to additional short bends and should be avoided as much as possible.

2 Standard of CNC Machine Tool Sleeve Roller Chain

CNC machine tool sleeve roller chains are standardized. According to the national standard GB1243.1-83, it is divided into two series, A and B, and the A series is commonly used. The chain number in the table is multiplied by 25.4/16mm, which is the pitch value of the chain. It can be seen from the table that the larger the number of chains, the larger the size of the chain and the higher its carrying capacity.

The marking of the sleeve roller chain consists of the chain number, the number of rows, the number of links in the entire chain, and the standard number. For example, the chain mark 16A-1×68GB/T1243-1997 indicates that the pitch is 25.4mm, A series, single row, 68-section roller chain.

 


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