Production for an ABMA Grade 24 standard domestically produced steel ball.
Ball blanks are cold or hot headed from rolls of wire or bar stock depending on their size and the material. The heading machine cuts off a short cylinder of the material and a moving die with a concave spherical cup drives the cylinder into a matching cup in a fixed die. The result is a spherical shape which is the ball blank.
The flashing operation removes the slight belt and small protrusions left on the surface faces by rolling them between the two hard alloy plates under high pressure.
The balls are hardened, if required, by heating them to a high temperature (over 1500 degrees Fahrenheit) in an atmospherically controlled furnace and then quenching them into a liquid bath. They are then tempered to reduce their brittleness by heating them to a low temperature (around 325 Fahrenheit). Samples are checked for hardness. The grain size and metallurgical structure are inspected under a high power microscope
The hardened balls are precision ground by rolling them between the faces of a fixed iron plate and a very hard fine-grit grinding wheel.
The next step is the lapping operation. The hardened ground balls are rolled between two cast iron plates. One plate is fixed while the other is rotated at a very low speed. The real secret of the extreme quality of precision balls happens here. At this stage the sphericity and size have been established and are carefully inspected by ABMA customer requirements. The final production operation is polishing which adds the shiny luster to the finished ball. The balls are then inspected visually and / or mechanically inspected.
Please note that the material information provided on our website is for informational purposes only. The properties listed per product type are typical and can vary based on suppliers of raw materials and customer specific needs. Please contact customer service for verification prior to ordering. Price and delivery may be subject to change based on specific requirements.