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hot rolled pipes undergo about 30% elongation and plastic deformation through cold drawing. depending on the hydraulic cylinder's stress conditions, the outer diameter deformation is minimized, and the inner diameter deformation is maximized. this significantly increases the ultimate strength of the inner surface of the finished cylinder, which aligns with the circumferential stress distribution experienced under internal pressure, benefiting the cylinder's load capacity.
hot rolled pipes produced by boring do not improve mechanical properties, necessitating thicker wall designs. cold drawn pipes increase yield strength by over 30%, allowing a 20-30% reduction in design wall thickness for the same material.
using cold drawn pipes and honing to manufacture hydraulic cylinder barrels is more material-efficient, energy-saving, and cost-effective than traditional hot rolled pipe boring and honing methods. steel pipe manufacturers should establish high-precision cold drawn pipe and cylinder production lines, producing low-carbon steel, medium-carbon steel, and low-carbon alloy steel (e.g., 27simn, 16mn) for hydraulic cylinder manufacturers. this would support economic and technological advancement.
hot rolled pipe boring involves multiple, complex processes, including clamping, correcting, cutting, and various transitions, requiring many sets of high-precision boring or honing tools. these tools are complex and costly, making it inefficient for small batch production.
in contrast, the cold drawing process is simpler, involving initial chemical treatment, drawing through internal and external molds to the required size, and final honing. drawing efficiency is high, with speeds up to 1m/min. cold drawn pipe honing increases processing efficiency by over ten times compared to hot rolled pipe boring.
cold drawn steel products' longevity varies due to the quality of raw materials. the stability of cold drawn pipe quality is influenced by:
1. the quality of the steel used.
2. the expertise of the technicians producing the pipes.
using high-quality steel from centerway steel and strictly adhering to production processes ensures the stability of cold drawn pipe quality.
