Hydraulic Cylinder Processing

Date： 1970-01-01

Cylinder cylinder as a hydraulic cylinder, mining monomer pillars, hydraulic support, guns and other products, the main components, the quality of its processing a direct impact on the product's life and reliability. Cylinder processing requirements, the internal surface roughness requirements Ra0.4 ~ 0.8μm, concentricity, wear resistance requirements. The basic characteristics of the cylinder is deep hole processing, its processing has been plagued by processing staff.

Rolling process, because the surface layer left residual compressive stress, the surface will help the closure of small cracks, hinder the expansion of erosion. Thereby improving the surface corrosion resistance, and can delay the generation or expansion of fatigue crack, thereby increasing the cylinder fatigue strength. By roll forming, rolling the surface to form a layer of cold hardened layer, reducing the grinding contact surface of the elastic and plastic deformation, thereby enhancing the wear resistance of the cylinder wall, while avoiding the burn caused by grinding. Rolling, the surface roughness value decreases, can improve the coordination properties.

Cylinder is the most important parts of construction machinery, the traditional processing methods are: broaching cylinder - fine boring cylinder - grinding cylinder. Rolling method is: broaching cylinder - fine boring cylinder - rolling cylinder, the process is 3 parts, but the time contrast: grinding cylinder 1 meter about 1-2 days, rolling Cylinder 1 meter about 10-30 minutes of time. Investment comparison: grinder or quilting mill (tens of thousands - millions), rolling knife (1 thousand - tens of thousands). After rolling, the surface roughness of the hole is reduced from Ra3.2 ~ 6.3μm to Ra0.4 ~ 0.8μm, the surface hardness of the hole is increased by about 30%, and the inner surface fatigue strength of the cylinder is increased by 25%. Cylinder life if only consider the impact of cylinder to improve 2 to 3 times, boring and rolling technology than grinding process efficiency by 3 times. The above data shows that the rolling process is highly efficient, can greatly improve the surface quality of the cylinder.

Cylinder after rolling, the surface is not sharp little edge, a long period of friction will not damage the movement of seals or seals, which is particularly important in the hydraulic industry.

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