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Processing of Copper Sleeve Parts

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Processing of Copper Sleeve Parts

Release date:2019-09-23 15:54 source:Original click:

 Types and structures of sleeve parts: According to their structural characteristics, sleeve parts can be divided into two types: integral and split.

  Technical requirements for sets of parts:

  1) inner hole

  Inner Kongshi sleeve parts play the most important role in supporting the fire guiding surface. The dimension tolerance grade of inner hole diameter is IT7, sometimes IT6 is used for precision sleeve, IT8 is used for inner hole of hydraulic cylinder, and IT9 can be reduced to IT9 if there is a sealing ring on the piston matching with it. Surface roughness is generally Ra 1.6~0.1; high requirements are generally: Ra 0.04

  2) outer circle

  External diameter tolerance grade is usually IT6~IT7; surface roughness is Ra3.2~0.4.

  3) Coaxality between inner and outer circles

  When the final processing of the inner hole is to press the sleeve into the box or the base, the coaxiality requirement of the inner and outer shoulders of the sleeve is lower; if the final processing of the sleeve is completed before assembly, the coaxiality requirement of the inner and outer circles is higher, generally 0.01-0.05.

  4) Verticality of hole axis and end face

  If the end face of the sleeve bears the axial load or acts as the positioning datum in the processing, the verticality requirement between the end face and the hole axis is higher, generally 0.02-0.05.

  Material and blank of sleeve parts:

  Material: Sleeve parts are usually made of steel, cast iron, bronze or brass. Some sliding bearings adopt bimetallic structure, i.e. casting tin bronze, lead bronze or bar alloy on the inner wall of steel coat by centrifugal casting method, which can improve the bearing capacity and service life.

  Roughcast: Sleeve with smaller aperture, usually hot-rolled or cold-drawn bars, but also solid castings. Castings and forgings with holes or seamless steel pipes are often used when the aperture is large. Some thin-walled bushes can be bent by bimetallic materials. In mass production, advanced manufacturing processes such as cold extrusion and powder metallurgy can be adopted.

  Major Technological Problems in the Machining of Kit Parts

  "Achieve the requirements of machining accuracy and surface roughness of inner holes, and ensure the mutual position accuracy between inner holes and outer surface"

  There are two schemes for the processing sequence of sleeve parts: the first is to take the outer circle as the final processing scheme, starting with the rough processing of the outer circle, then roughing and finishing the inner hole, and finally finishing the outer circle. This scheme is suitable for the sleeve parts whose outer surface is the most important surface. The second scheme is to take the inner hole as the final processing scheme, starting with the rough processing of the inner hole, then roughing and finishing the outer circle, and finally finishing the inner hole. This scheme is suitable for inner hole surface, which is the most important set of parts.

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