Combination Rolling increase spindle speed

In order to meet the rapid development of the machine tool industry, as well as photovoltaic industry micro machining needs, ultra high-speed aerostatic bearing speed now exceeds 3x10e6DN, equivalent shaft surface faster than 150m / s. However, since the bearing clearance between the range 5-20um, at that speed, the air film must have to withstand particularly high shear rate capability. The resulting viscous forces on the bearing thermal and dynamic characteristics have a deadly effect. Loadpoint new design a successful combination with groove rolling series of aerospace bearings overcome this problem.

This new design has been improved so that high-speed operation, it is possible to increase the speed limit and a hard resistance and reduce operating temperatures. Loadpoint new design effectively overcome the main limitation factor that makes aerostatic bearings achieve faster speeds. The aerodynamics and static mechanics combine

Loadpoint combination of the grooved ball bearing - a spiral groove roll neck bearings and a spiral groove thrust bearing, the bearing can be rotated to the center the air squeezed. At high speed, the grooves change this effect can be largely inside the bearing pressure distribution and improve the load capacity and rigidity. Helical groove can also change the speed of the air film inside the bearing and gradient, while reducing the viscosity of the bearing wear. Since the viscosity of air bearing wear and inversely proportional to the area and voids in the same minimum clearance under the combined grooved rolling friction smaller than conventional bearings. The higher the speed, this advantage is more obvious. Rolling and groove combination with traditional aerial bearing performance difference can illustrate this point. . With the increase in speed and the shaft, the bearing lower minimum gap from 28um to 16um. At low speed, the results similar to conventional bearings.

However, when the speed of up to 120,000 rev / min, the band groove bearings have a clear advantage, but also may reach higher speeds. Importantly, the combination of grooved rolling thrust bearing and thrust bearing as conventional, with a static stiffness. However, the function of the groove,

It consumes less energy. Furthermore, the influence of the air force, the hardness increases as the speed increases. However, the conventional thrust bearing not this functionality. That with the combination of the first rolling groove is advantageously within the bore of the grinding spindle with the rotating body. Use of proven, and conventional aviation bearings, rolling bearings with groove combination allows the rotation speed increased by 25% and the current consumption is also reduced by 10%. People also will design a high-speed micro-devices so that the machine spindle diameter is reduced to 50um. Of course, high speed and accuracy as well as running slow calorie reduction are inseparable.