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In the list of grinding machines, there are some very well-known types, even those in the industry are not familiar. For example, cylindrical grinder, surface grinder, roller grinder, etc. However, today we will discuss the so-called another grinder, which is also very popular in a sense, but the concept is ambiguous. In the metalworking industry, other grinding machines usually mean centerless grinding and electrochemical grinding.
Regarding centerless grinding, this is a machining process that uses abrasive cutting to remove material from the workpiece. The difference between CNC centerless grinding and traditional centering grinding operations is that no spindle or fixture is used to position and fix the workpiece. The workpiece is fixed between two rotating grinding wheels, and their rotational speed also relatively determines the rate at which material is ultimately removed from the workpiece.
In general, centerless grinding is usually preferred over other grinding processes for operations where many parts must be machined in a short cycle. As we discussed earlier, CNC type centerless grinding differs from traditional centering grinding operations in that it does not involve a spindle or fixture, and the workpiece is fixed by another method different from the traditional centering grinding method.
After turning, roughing, milling, drilling, boring or other mechanical processing, the processed surface should be finally processed to a certain degree. This allows the workpiece to be used correctly, and this principle also applies to the wood processing industry and the plastics and rubber industries. As a result, in the metalworking industry, all forgings are machined and processed, and then the grinding process waits here to solve quality problems. In order to grind the workpiece, the grinding wheel is a tool wheel composed of abrasive composite materials, and is used for various abrasive cutting and abrasive machining operations.
In addition, tool grinding wheels and other components such as key components are also used in the grinding machine, so the grinding wheels are usually made of composite materials. The composite material is composed of coarse-grained aggregate and is pressed and bonded together by a cemented matrix to form a solid, round shape under normal circumstances. In fact, depending on the goal of the wheel, there can be various profiles and cross-sections. They can also be made of metal, such as solid steel or aluminum discs, and bind their particles to the surface.
Today, most grinding wheels are artificial composite materials made of artificial aggregates, but the history of grinding wheels in the past started with natural composite stone. In the past, these kind of tools were difficult to manufacture. For example, the tools used for grindstones are ancient examples. In grinding wheels and corresponding processes, the vertical grinding method is the most common of all other options, while PLC vertical grinding is a finishing process that uses rotating grinding wheels to smooth the surface of metallic or non-metallic materials.
Generally speaking, in the centerless grinding process, the workpiece is fixed between two wheels rotating in the same direction at different speeds, and is fixed on a workpiece fixed platform. A grinding wheel called a grinding wheel rotates on a fixed shaft so that the force exerted on the workpiece to be ground is directed downwards at the workpiece fixing platform itself. The grinding wheel usually performs a grinding action on the workpiece at the contact point at a tangential speed higher than the tangential speed. The other wheel, called the adjusting wheel, is movable, its position is set to apply lateral pressure to the workpiece, and it usually has very rough or rubber-bonded abrasive to capture the workpiece.
With these premises, this is why in the field of grinding, sometimes people also call centerless grinders as other grinders. There are basically three main types of centerless grinders, namely straight feed, end feed and centerless grinder feed types. For the linear feed mode, during the operation, the workpiece is completely fed by the grinding wheel, which enters on one side and exits on the other side. Therefore, the adjustment wheel entered through the feed grinding will deviate from the plane of the grinding wheel to provide an axial force component to feed the workpiece between the two grinding wheels. The other two methods are different methods, and we may have the opportunity to discuss them further in the future.
Due to the design of workpieces in engineering drawings, centerless grinding has become increasingly common in industrial applications. It can be expected that in the future, centerless grinding may also be fully developed like surface grinding and cylindrical grinding models.
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