DIMENSIONNEMENT PALIERS LISSES PDF

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The new product series are the first to use direct drives developed and produced by Zollern. With its precision solutions in the field of hydrostatic rotary tables, ZOLLERN has long been an established partner of the engineering industry, dimenssionnement hydrostatic bearing precision rotary tables with diameters from to 4, mm. Apart from complete tables, ZOLLERN also supplies ready-to-install hydrostatic bearing components as radial-axial bearings for rotary tables up to a diameter of 10, mm.

In response to continuing strong demand for precision solutions from the European and particularly the German machine tool industry, ZOLLERN has extended its product range to include aerostatic rotary tables with table diameters of to 1, mm. What’s more, they can be connected to existing pneumatic systems, and because they don’t require hydraulic oil, they are cleaner. This makes aerostatic rotary tables ideal for measuring and high-precision machine tool manufacturing, while hydrostatic solutions are predominantly used for gear cutting machines, vertical grinding and milling machines, vertical lathes and machining centres.

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However, not only the precision requirements determine where the different types of rotary table are used. Equally important are the bearing capacity and machining speed. While hydrostatic rotary tables work with a feed pressure of the medium ppaliers approximately 30 to 40 bar, aerostatic systems use only around 6 bar. This difference in feed pressure and compressibility of the support dimensionnemenr means hydrostatic tables have five to ten times the bearing capacity of aerostatic tables of the same size.

Bearing pressure

At the same time, the higher bearing capacity of hydrostatic rotary tables and the associated use of hydraulic oil limits the possible processing speed compared to aerostatic tables. The viscosity of hydraulic oil comes with a shearing friction that leads to power loss and heating of the assembly.

In contrast, the circumferential speed of aerostatic bearing tables is theoretically unlimited because shearing friction can not occur with air. The advantages of both types compared to conventional, antifriction bearing tables are firstly the freedom from wear which guarantees sustained precision.

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Secondly, both systems come with better damping characteristics. The damping characteristics of the two media, hydraulic oil or air, reduce the upswing of the whole system.

That results in much higher machined surface qualities. Tool wear is reduced, and higher machining speeds are possible. They are an integral part of the hydrostatic and aerostatic rotary tables.

Although they are tailored to each customer’s application, what they all have in common is a much lower torque ripple than the usual solutions on the market. The power loss is up to 25 percent and the nominal current up lissse 15 percent lower. The heat acting on the surrounding components is correspondingly low.

Bearing pressure – Wikipedia

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Application determines technical solution However, not only the precision requirements determine where the different types of rotary table are used.

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