In the grinding field of small mechanical inventories, small centerless grinding is a fast processing procedure that uses abrasive cutting to remove material from the workpiece. The difference between small centerless grinding and centering grinding is that no spindle or fixture is used to position and fix the workpiece, and the workpiece is only fixed between two rotating grinding wheels, while the speed of their rotation relative to each other determines the rate where material is removed from the work piece. In short, centerless grinding is generally preferred over other grinding processes for operations in which many parts must be processed in a short period of processing.
In the field of grinding wheels, each abrasive on the surface of the grinding wheel cuts a small chip from the workpiece by the shear deformation method. Due to the different uses and applications, the mechanical inventory of grinding machinery is huge and the classification is also very complicated. Some of the most well-known grinder inventories are: belt grinder, bench grinder, cylindrical grinder, surface grinder, tool & 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 the fixed axis and rotates so that the force applied to the workpiece is directed downward to the workpiece holding platform unit. 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, can be moved with good sportiness.
In addition, the wheel is positioned to apply lateral pressure to the workpiece, and usually has very rough or rubber-bonded abrasive to capture the workpiece. 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 workpiece rotates together with the adjusting 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 debris as it passes by. It is the design of the small grinding machine designed.
Small centerless grinding uses a dedicated centerless grinding machine. Such a machine will always include some of the critical components, such as the grinding wheel, regulating wheel, and some means of supporting a work piece. 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 adjustment wheel to be adjusted to accommodate parts of different sizes and materials. 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 face feed grinding is most suitable for tapered workpiece units.
At the same time, in-feed centerless grinding is used to grind 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 adjusting 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 tool. 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. This is that the spindle or fixture is not used to position and fix the workpiece, so the workpiece only It is fixed between two rotating grinding wheels. Their rotational speed relative to each other will determine the speed at which the material (workpiece) is removed from the machining axis.
Although the size of the grinder may limit its working capacity to a certain extent, the working capacity in the defined area is still very good for most small centerless grinding machines, and the same principle is also applicable to small cylindrical grinding machines and surface grinding machines.
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