spring , Iran

A helical compression spring is an elastic mechanical element for storing and releasing energy. These springs are typically made from high-carbon steel wire per ASTM A227 or A229 standards. The wire diameter d ranges from 0.5 to 20 mm, and the mean coil diameter D varies from 3 to 200 mm. The spring index C = D/d is usually chosen between 4 and 12 for optimal strength-flexibility balance. The shear modulus of steel G is approximately 79 GPa. The spring rate or constant k is calculated between 0.1 and 100 N/mm. The allowable design shear stress is typically up to 450 MPa for hardened steel. These springs undergo a stress-relief heat treatment at around 250 degrees Celsius.

The spring structure is defined by precise geometric parameters: number of active coils n, pitch p, and helix angle α. The spring ends are usually ground flat for uniform load distribution. The manufacturing process involves coiling, heat treatment, and often shot peening. This process increases fatigue life by up to 50%. The solid length must be less than 80% of the free length. Special-purpose springs may be made from non-ferrous materials like beryllium copper or Inconel. Quality control tests include verifying load at solid height and fatigue testing under alternating cycles. They are often packaged with protective oil or phosphate coating.You can order and buy spring from Iran by contacting us through whatsaap and email.
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