Manufacturering comproses the following steps.
The wire rod is drawn to the required size,in closer tolerances so that it can be used in cold forging.
.......The wire rod is drawn to the required size,in closer tolerances so that it can be used in cold forging.
The second production step is the rolling between plates with concentric grooves in order to eliminate the heading witness marks and to increase the precision of the ball In this operation the spheres are ground between two concentric pressure plates to correct the sherical shape and remove the seam formed in the cold forging.
The balls are heat treated, i.e. Hardened and tempered to attain the desired level of hardness and microstructure The heat treatment, when necessary, gives the maximum possible hardness and the desired microstructure to the ball and therefore the best obtainable technical features in compliance with materials used.
Here the hardened balls are ground to improve suface finish and geometrical parameters. Several careful grinding processes with ceramic wheels lead to a higher size precision preparing the balls for the next final lapping operation.
The final lapping operation gives the ball a perfect bright, compact surface, without any defect, with a very low surface roughness, very low deviations from spherical form, very low roughness values, very low waviness values and total lack of surface defects assured by optical control machines, are the four basic parameters which guarantee final customer an extremely qualified product for its relevant use.
The final lapping operation gives the ball a perfect bright, compact surface, without any defect, with a very low surface roughness, very low deviations from spherical form, very low roughness values, very low waviness values and total lack of surface defects assured by optical control machines, are the four basic parameters which guarantee final customer an extremely qualified product for its relevant use.
To ensure the highest quality each and every parameter of the balls is throughly inspected before packing and dispatch. All precision, hardness, material features, etc. are tested at every stage of the production and again before shipping, at the end of the manufacturing process, in order to assure and guarantee the quality. Each lot of balls is inspected with optical machines effecting a surface visual test, where the defective ball gets rejected At the same time a test of physical integrity of balls is effected by Eddy current probes, if required. These are 100% checks by skilled personnel.
Finally steel balls can be shipped in various drums and different sized corrugated boxes depending on the contents.
