DMG Precision

Machining Accuracy of Machine Tools

Productivity and accuracy of machine tools are important competition aspects. Rapidly changing operating conditions for machine tools, however, make it difficult to increase productivity and accuracy. In the manufacture of parts, increasingly small batch sizes have to be produced economically, and yet accurately. In the aerospace industry, maximum cutting capacity is needed for the roughing processes, whereas the subsequent finishing processes must be executed with maximum precision. For milling high-quality molds, high material removal rates are required during roughing and excellent surface quality must be obtained after finishing. At the same time, maximum contouring feed rates are necessary to realize the required minimum distances between the paths within acceptable machining times.

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		Task: Machine tools must achieve high accuracy even under changing operational and ambient conditions.
		Problem: Feed drives generate heat, which leads to thermal deviation in Semiclosed Loop.
Semiclosed Loop (position measurement via ball screw/rotary encoder) - Pitch error, - elastic deformations, - thermal expansion of the ball screw limit the accuracy of the machine.		Closed Loop (position measurement via linear encoder) Errors of the ball screw are compensated.
Linear and angle encoders for position measurement (close-loop control) are a prerequisite for high manufacturing accuracy from the very first part. DMG has committed itself to high-precision measuring systems from HEIDENHAIN.