With the continuous development of high-speed cutting, the structural rigidity of the traditional tandem mechanism construction platform and the high speed of the mobile platform have gradually become the bottleneck of technological development, and the parallel platform has become the best candidate. Compared with the tandem machine tool, The parallel working platform has the following features and advantages:
(1) Simple structure and low price
The number of mechanical parts of the machine tool is greatly reduced compared with that of the series structure platform. It is mainly composed of general components such as ball screws, Hook hinges, ball hinges, and servo motors. These general components can be produced by specialized manufacturers, so the manufacturing and inventory cost ratio of this machine tool is the same. Traditional machine tools are much lower in functionality and easier to assemble and handle.
(2) High structural rigidity
Due to the closed-loop structure, it has the advantages of high rigidity and high speed, the structural load streamline is short, and the tension and pressure of load decomposition are simultaneously borne by six connecting rods. From a viewpoint, when the external force is constant, the stress and deformation of the cantilever are the largest, followed by the build-in at both ends, then simply-supported at both ends, followed by the two-force structure under compression, The two-force structure under tension has the smallest stress and deformation, so it has high rigidity. Its stiffness to weight ratio is higher than that of traditional CNC machine tools.
(3) High processing speed and low inertia
If the force on the structure were to change direction, (between tension and compression), the two-force member would be the most material-efficient structure, with minimal moving parts and driven by six actuators simultaneously , so the machine is easy to speed up and has low inertia.
(4) High machining accuracy
Because it is composed of a multi-axis parallel mechanism, the lengths of the six retractable rods all act independently on the position and attitude of the tool, so there is no accumulation and amplification of geometric errors of traditional machine tools (ie, tandem machine tools), and even average It has the thermal symmetry structure design, so the thermal deformation is small; so it has the advantage of high precision.
(5) Multifunctional and flexible
Due to the simple and convenient control of the machine tool mechanism, it is easier to design it as a special machine tool according to the processing object, and it can also be developed into a general-purpose machine tool for milling, boring, grinding and other processing, and can also be equipped with necessary measurement The tool composes it into a measuring machine to realize the multi-function of the machine tool. This will bring great application and market prospects, and has a very broad application prospect in national defense and civilian use.