Centerless Grinding and Precision Machining

Posted on Dec 9, 2019

Centerless Grinding and Precision Machining

In the field of grinding, centerless grinding is a processing program that uses abrasive cutting to remove material from a workpiece.

Centerless Grinder

The difference between centerless grinding and centered grinding is that no spindle or fixture is used to locate and secure the workpiece, and the workpiece is only fixed between two rotating grinding wheels, while their relative rotation speed determines the rate from the workpiece Where to remove material.

In short, for operations that must process many parts in a short time, centerless grinding is usually preferred over other grinding processes.

:: Read more : The centerless grinders are unique


Grinding Wheel Matters

In the grinding machine, each abrasive on the surface of the grinding wheel cuts a small piece from the workpiece by the shear deformation method. Due to the different uses and applications, the mechanical inventory in grinding machinery is huge, and the classification is also very complicated. Some of the most well-known grinder stocks are: belt grinder, bench grinder, cylindrical grinder, surface grinder, tool and cutter grinder, jig grinder, gear grinder, die grinder, angle grinder, and roll grinder.

In centerless grinding, the workpiece is clamped between two wheels rotating at different speeds in the same direction, and a workpiece fixed platform, such as an electromagnetic chuck. One wheel is on a fixed shaft and rotates so that the force applied to the workpiece points downwards to the workpiece holding platform.

According to the design, the wheel usually performs the grinding action by the contact time and the tangential speed of the side being higher than the tangential speed of the workpiece. The other wheel, called the regulating wheel, is movable. The grinding wheel is positioned to apply lateral pressure to the workpiece, and the grinding wheel usually has very rough or rubber-bonded abrasive to trap the workpiece.


Wheel Speed

The speed of the two wheels relative to each other provides an abrasive effect and determines the rate at which material is removed from the workpiece. During operation, the working part rotates with the regulating wheel, has the same linear velocity at the contact point, and does not slip.

Therefore, the grinding wheel rotates faster, slips over the surface of the workpiece at the point of contact, and eventually removes material chips as it passes.


Custom Made

Centerless grinding utilizes a dedicated centerless grinding machine. Such a machine will always include some key components, such as grinding wheel, regulating wheel, and some means of supporting a workpiece. Modern machines may involve computer numerical control (CNC) to achieve automation and improve accuracy.

The grinding wheel is interchangeable for the operator, so the design goal is to allow different grit and shape according to the task. Machines designed for feed grinding operations will allow the angle of the regulating wheel to be adjusted to accommodate parts of different sizes and materials.


Mechanism: End-Feed and In Feed

With regard to end-feed centerless grinding, the workpiece part is axially fed into the machine in one direction and rests on the end stop. Perform the grinding operation in this way, and then feed the workpiece on the other side in the opposite direction to exit the machine. In summary, the end-feed grinding is most suitable for tapered workpieces.

In contrast, in-feed centerless grinding is suitable for grinding workpieces with relatively complex profiles and shapes, such as hourglass shape, curved cylinders, bent-like tubes, etc. Before the process starts, the workpiece is first loaded by the worker and manually placed on the grinding machine, and then the regulating wheel is moved to the correct position. The complexity of the part shape and the shape of the grinding wheel requires precise grinding, which will prevent the workpiece from being fed axially through an inappropriate machine.


Centerless and Cylindrical

When comparing centerless grinding machines and cylindrical grinding machines, it is important that the difference between centerless grinding and center grinding operations, such as cylindrical grinding and internal grinding procedures, is that no spindle or fixture is used to position and fix the workpiece, so the workpiece only It is fixed between two rotating grinding wheels, and their rotational speed relative to each other will determine the speed at which the material (workpiece) is removed from the machining axis.

:: Read more : Cylindrical Grinding and Great Productivity


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