How Is Steel Shot Manufactured?

- Sep 05, 2017 -

Types

Steel shot may be manufactured in two ways. The first way involves using a mold with round impressions, while pouring molten steel into the top. Once the steel cools, the shot is removed. The mold leaves a piece of extruded metal on the top of the shot, which is removed during the finishing process. Using molds to manufacture steel shot has largely given way to a newer method, known as cut wire steel shot.

Process

A process known as cold heading. With cold heading, a ring of excess metal, known as a flashing, is left around the middle of the shot.

Considerations

The shot then runs through grooves between two iron disks, which strip the flashing from the steel shot. Shots go through this machine several times, until they reach a rough size. After this point, the steel shots enter a heat treatment machine, which increases the strength of the metal. After heating, the shots enter another machine, which grinds them down to within 0.02 centimeters of their final size.

Finishing

After going through a rough grinding machine, steel shots must be run through a lapping machine. This machine contains abrasive compounds, which remove the final layer of steel, giving the shots a smooth appearance. The lapping machine works on a batch for up to 10 hours, with the length of finishing depending on the precision of the shot.

Size

Steel shots vary widely in size, depending on their application. While the ball bearings in a swivel office chair are BB-sized, helicopter rotors use large steel shots. Common sizes, listed by Pellets LLC, range from 0.30 to 3.2 mm in diameter. 



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