Abstract
Machine tools are built based on cast-iron bodies. Cast iron well dumps down vibrations and is dimensionally stable. Therefore, many conventional machine tools are modernized and modified into CNC machine tools based on the seasoned old bodies of those machine tools. Nevertheless, CNC machine tools are also manufactured based on polymer concrete, which vibration damping ability is even better. On the other hand, attempts made in the past by leading machine tool manufacturers to use welded frames in CNC machine tools failed. The revival of interest in welded frames was spurred by economic considerations, as steel systems are much thinner compared to cast-iron ones. They are able to carry the same loads. The construction of CNC machine tools with a welded steel frame undertaken at the Institute of Mechanical Technologies (ITM) of the Czestochowa University of Technology is an attempt to solve this constructional problem. The machine tool frame was designed with use of CAD solid works system. The ultimate success of using the welded frame is determined not only by the frame itself, but also generally the design of the machine tool and its operation parameters. The welded frame was used for a high-accuracy three-axis milling machine. In this respect, it is equal of professional machine tools manufactured by reputed companies. It can be either a production machine tool or a test stand.
Highlights
Conventional machine tools and, generally, CNC (Computer Numerical Control) machine tools are manufactured based on cast frames of either grey engineering cast iron or modified cast iron [1]
CNC machine tools are manufactured based on polymer concrete frames, whose vibration damping capability is even better [2] – Table I
Polymer concrete may provide a filling of cast iron or steel machine tool frames as a vibration damping mass
Summary
Conventional machine tools and, generally, CNC (Computer Numerical Control) machine tools are manufactured based on cast frames of either grey engineering cast iron or modified (malleable or nodular) cast iron [1]. CNC machine tools are manufactured based on polymer concrete frames, whose vibration damping capability is even better [2] – Table I. By contrast, welded frame machine tools may be different in terms of the table size and the magnitude of displacements along individual axes, as needed, which can be an asset of this technology. This is important especially in the automation of production and building of production lines composed of several specially designed machine tools
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