What are the manufacturing technologies of the cylinder rod shaft?

Processing Technology of the cylinder rod shaft

The manufacturing process used for the cylinder rod is a crucial aspect that significantly impacts its quality and lifespan. The processing technique employed directly determines the quality of the cylinder rod. Typically, the piston rod undergoes rolling during processing, as this method enhances the corrosion resistance of its surface, thereby delaying the onset and spread of fatigue cracks. This, in turn, improves the fatigue strength of the piston rod. The cylinder rod, also known as the shaft, is usually coated with a layer of chrome plating, predominantly Hard chrome plated shaft.

Considering the design idea, the chrome plated shaft does not want to bear radial force, but due to the limitation of the actual structure, the chrome plated shaft of the hydraulic cylinder inevitably bears a considerable part of the radial external force. To this end, the length of the hydraulic cylinder piston must be appropriate, generally taking 0.7 to 1.0 times the outer diameter of the cylinder shaft. In order to increase its guiding effect and increase the bearing surface area, so as to achieve the purpose of reducing wear and improving the service life of the hydraulic cylinder.

The quality of the hydraulic cylinder depends to a large depends on the quality of the hydraulic cylinder tube and the cylinder piston rod, so the machining of the piston rod should require sufficient geometric tolerances. Generally speaking, the error of the outer diameter of the piston, the roundness of the inner hole and the cylindricity should not be greater than half of its dimensional tolerance; the tolerance of the outer diameter of the chrome plated piston rod to the inner hole and the concentricity of the sealing groove should be within 0.02mm. It is generally required that the verticality tolerance of the end of the hydraulic cylinder to the axis of the hydraulic cylinder should be less than 0.04mm/100mm.

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