Material

ZX-530CD3

Description of the application

The bushing is used as guiding of a vibration generating piston in pneumatic cylinders of grinders.This produces a cross- grinding on the work-pieces.The piston is driven by compressed air (oil and water free). The cylinder is fi tted with radial slots, so that the air can enter and exit through them. The system works, in principle, as a twostroke engine. The piston stroke is  36mm at a sliding speed of 350 m/min.

Problem

So far, a coated steel sleeve which was glued into a cylindrical aluminium body, was used. Unfortunately the adhesive was  dangerous to human health, the applying of the coating was laborious and had poor adhesion to the steel sleeve. The coating was also highly sensitive to shocks. Therefore, they were seeking for an easy solution in which even dry running would have  been possible. A service life from 5 up to 10 years was required.

Problem-solving

Instead of a glued and coated sleeve, now a bushing of ZX.530CD3 is used, which will be polished in the inner diameter after its tight fi t in order to improve its tribologiacal properties.

Advantages

Easy installation, thanks of the cooling system by the driving air, a very low guidance clearance of 0,019 – 0,023 mm is possible, hardly measurable wear.