The spring is mounted in a jig to ensure the correct orientation during grinding, and it is held against a rotating abrasive wheel until the desired degree of flatness is obtained. When highly automated equipment is used, the spring is held in a sleeve while both ends are ground simultaneously, first by coarse wheels and then by finer wheels. An appropriate fluid (water or an oil-based substance) may be used to cool the spring, lubricate the grinding wheel, and carry away particles during the grinding.
II. Shot peening. This process strengthens the steel to resist metal fatigue and cracking during its lifetime of repeated flexing. The entire surface of the spring is exposed to a barrage of tiny steel balls that hammer it smooth and compress the steel that lies just below the surface.
III. Coating. To prevent corrosion, the entire surface of the spring is protected by painting it.
Design.
Design of the spring varies greatly on the type of usage. Considerations such as the load of the, type of road it uses and spring constant plays an important role in the design. A good absorber should withstand load shock and return to its original length efficiently. Below are the general specifications of the shock absorber. However care should be taken to produce a spring with a high spring constant in order to withstand stress load upon it.
Type of spring.
A coil spring will be created with resemblance of the diagram above. This spring is circular in cross section. The diameter of the spring is fixed according to the stiffness needed before the manufacturing process.
Dimension of the spring.
Material: Alloy spring steel .
Modulus of rigidity, G = 4100.
Mean diameter of a coil, D= 62mm.
Diameter of wire, d = 8mm.
Outer diameter of spring coil, D0 = D +d = 70mm.
Total no of coils, n1= 18.
Height, h = 220mm.
No of active turns n= 14.
The dimension of spring is fixed according to the research done by ;.
Associate Professor Dr.