The milled parts available in our shop are produced using 3-axis or 5-axis milling machines. Milling is a machining process used to produce block-shaped workpieces. Like all machining processes, CNC machines remove material from a raw part, and the resulting chips are recyclable.
Milling belongs to the group of machining processes with a geometrically defined cutting edge. Material is removed during milling by rotating the milling tool at high speed while either the tool traces the contour to be produced or the workpiece is moved accordingly.
In milling, the feed movement occurs perpendicular, oblique, or circular to the rotation axis of the tool. In contrast, drilling occurs in the direction of the rotation axis.
Milling is mainly used to produce flat surfaces, such as grooves or guides for moving machine parts.
However, modern milling machines can also create complex three-dimensional shapes such as turbine blades or dies.
A large portion of all gears is produced by hobbing, which uses specialized hobbing tools.
Special processes include hard milling and high-speed milling, which are variants of hard machining and high-speed machining, respectively.
Milling has some distinctive features compared to other machining processes.
In milling, the individual cutting edges do not have continuous contact with the workpiece. During one rotation, they penetrate the material, remove chips, and then disengage from the workpiece.
This characteristic is referred to in technical literature as interrupted cutting. This leads to a shock-like, fluctuating course of the cutting force, which also affects the tool.
The chip thickness changes during rotation and is not constant, unlike most other processes. Additionally, during one tool rotation, the angle between the cutting movement and the feed movement, known as the feed direction angle, continuously changes.
However, the cutting edges can cool down while they are not in contact with the workpiece. Moreover, the machine can automatically eject the short, comma-shaped chips. Measures for chip breaking are therefore not necessary.
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