spring , Iran

A compression spring is a helical elastic element designed to withstand axial compressive loads and store mechanical energy. Wire diameter typically ranges from 0.2 to 20 millimeters, while outer diameter varies between 2 and 200 millimeters. The spring index D over d is commonly maintained between 4 and 12 to ensure stability and uniform stress distribution. The spring rate is calculated using k equals Gd to the fourth power divided by 8nD to the third power. The shear modulus of spring steel is approximately 79 gigapascals, with allowable shear stress between 400 and 800 megapascals. Free pitch and active coil number are defined according to working stroke and a safety factor from 1.2 to 1.8.

The structure consists of concentric coils with closed or ground ends to provide uniform load transfer. Free length may range from 5 to 600 millimeters, and maximum allowable deflection is typically 30 to 40 percent of free length. Stress relief heat treatment is performed between 250 and 450 degrees Celsius to improve dimensional stability. Final hardness for carbon steel is adjusted between 42 and 52 HRC. Fatigue life within 10^5 to 10^7 operating cycles is achieved with a stress concentration factor below 1.6. Quality control includes load testing, permanent set evaluation, and dimensional inspection with 0.01 millimeter precision.You can order and buy spring from Iran by contacting us through whatsaap and email.
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