BROACHING

Broaching is a metalworking process wherein a tooth-like tool is sued to remove metals from the inner or outer part of the specific work piece, based upon the machines positioning. Broaching machines may be either horizontal or vertically aligned and they can push/ pull the broaches from the work piece, again depending on the positioning. The broaching process brings about a smooth surface finish, but can also make surfaces of dimensional structures if necessary. Broaching machines are normally very expensive, but they are still preferred over other functions whenever there is a large quantity of production units to work on.

The broaching process involves 4 different types of operations; they are surface broaching, pull down broaching, push broaching, and pot broaching. The broaching machines are designed a specific format. The parts are clamped up tightly into the machine, there can be no sharp edges, dovetailed spines or even blinded holes on the surface, and rounded corners are replaced by chamfers. Broaching is also used for cutting square keyways or even round splines, out of articles like pulleys, gears and drive shafts. The broaching tool can remove metal differently on different metals. Therefore, these are designed according to specifications.

A Rotary broach or a wobble broach is a kind of broaching tool that can create the irregular holing or the outer contour of a broach. It is used most often in machines like screw machines, lathes, and other Swiss running machines. These broaching tools need 2 elements- the broach and of course the tool holder. The butting edge of the broach consists of a shape that is designed to give the final product its structure, and it is always much wider than its body. The broaching tool moves free of its edges inside of the toll holder, but however, is inclined towards the structures rotation axis.