Centreless Grinding

With centreless grinding, the piece is held by a support and control guide between a wheel that drives the piece and the component. Unlike traditional methods, when the piece is not fixed, it does not require connections at the ends. Instead, the piece rests on a support rail and the control wheel. 

Extra information about centreless grinding


The piece rotates between the rapidly rotating grinding wheel and the slower rotating disk, which is generally smaller. The support bar of the grinder is usually positioned so that the centre of the workpiece axis is located on the line connecting the centre of the adjustment component and the grinding wheel.


The control wheel is composed of a soft material, such as a rubber mixture that can contain the hard grains to ensure adhesion between the piece and the adjustment of the wheels.


Roundness


Grinding without technical centres capable of producing softness. Due to the preservation and simultaneous processing of the workpiece surface, it can also occur during grinding roundness type of process.


The correct adjustment of the grinding machine and the gap adjustment geometry is very important. If a high point of the piece touches the wheel, it adjusts a low point in the piece is ground on the opposite side.


This low point cannot be exactly in front of the highest point. The grinding machine must be set so that a polygon structure on the ground with many curves and the piece is therefore almost round.


Techniques


The piece can have different thicknesses and is neither a part of the piece or ground with the grindstone rectified the whole piece. Cylindrical pieces can be treated with this procedure. The piece may be longer, the grindstone and polished is still its entire length.


Even small pieces can be treated while running. There are then often simultaneously in different parts of the grinding machine and high rectified capacities can be achieved.


Benefits of centreless grinding


With the continuous support of the piece, it can be machined flexurally and treated for fragility (low flexion/torsion). The piece does not require any preparation for stretching or for transferring the rotation motion (no error is eliminated). Changing of the piece is simple and easy to automate.


Workpiece change time is spent in the continuous grinding crossbar. With the crossbar grinding, extremely long pieces with the machine of small workable size. Very large peripheral speed grinding wheels are reachable.


A number of brands offer centreless grinding machine product lines. In order to always meet new customer needs, they leverage years of experience in grinding technology and control electronics.


The results are exceptional in terms of precision machines, efficiency, sturdiness, rigidity and stability. Automation is always adapted to customer needs and allows optional fully automatic operation with minimum effort.


All spindles have ball bearings. Some modeld have a new, symmetrical grinding bed structure. The piece is firmly fixed to the centre of the grinding bed to obtain maximum static and thermal stability. The spindle motor with direct drive for vibration reduction and low energy costs.