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Posted on Apr 20, 2021
The universal elements of a grinder machine include the base without or with fixtures that can grip and guide the metal parts, the powered grinding wheel(s) which rotates at desired speed under control. Three classic power sources include manual operation, Numerical Control (NC), or Computer Numerical Control (CNC) systems.
A centerless grinder is popular in the modern market for effective abrasive cutting in order to remove the metal materials from the surface of workpieces. If you intend to procure one, this article will give you a basic understanding of the machine.
A Centerless grinder machine is one common type of grinding machine, a common counterpart to the centered type grinding machines. These units are used to create various profiles including cylinder, cam, crankshaft, and also an ellipse. There might be more than one grinding wheel that is mounted on a grinder machine to shave the material. After the metal pieces are automatically fed into the grinding wheels, a wide variety of metal products can be produced, for example, tubes, bearings, rods, and also some high precision components used in the automotive industry.
In most grinding machines, the workpieces are placed on the central axis and processed under rotation. However, centerless grinder machines, different from the typical centered style, require no spindle and fixture to position and secure the metal parts. The metal parts are held between two spinning grinding wheels. The rotating rate during the centerless grinding process can determine how efficiently the materials are removed from the surfaces of metal parts. A centerless grinder is generally preferred by operators who need to complete high volume production in a short time.
The universal elements of a grinder machine include the base without or with fixtures that can grip and guide the metal parts, the powered grinding wheel(s) which rotates at desired speed under control. Three classic power sources include manual operation, Numerical Control (NC), or Computer Numerical Control (CNC) systems. CNC grinder machines are increasingly popular in the market since the operation is reliable and efficient.
The condition and materials of the grinding wheel can determine the efficiency of centerless grinding and other grinding operations. Typical metal materials of grinding wheels include silicon carbide, diamond, aluminum oxide, and also cubic boron nitride. Among these wheel materials, aluminum oxide is the most inexpensive and common choice. Cubic boron nitride and diamond grinding wheels, because of the higher price, are sometimes produced with other metals in the core of the wheel which is surrounded by a layer of diamond or cubic boron nitride. Strong grinding wheels made from cubic boron nitride and diamond are ideal for cutting ceramics and carbides and other difficult materials.
:: Read More: How to Take Centerless Grinder Machine to the Next Level
In centerless grinders, the metal parts are placed at the holding platform between two grinding wheels. The two rotary wheels spin in the same direction but with different rotation rates during centerless grinding. The two grinding wheels are known as the grinding wheel and the regulating wheel respectively. The grinding wheel is stationary and is installed on a fixed axis to apply the force downward onto metal parts. At the contacting point, the grinding wheel in the centerless grinder has a higher tangential speed than the metal parts. As for the regulating wheel, it is the movable wheel that can apply lateral pressure to the metal parts. During centerless grinding, the metal parts will spin with the regulating wheel while the grinding wheel spins faster. The grinding wheel will slip past the surface of the metal part at the contacting point, removing metal chips as the material passes.
The centerless grinding process can be divided into three styles which are characterized by how metal parts are fed into the machines:
In through-feed centerless grinding, the metal parts are fully fed through the grinding wheels in centerless grinder machines. This means the material comes into the wheel on one side and exits on the opposite side. On the other hand, the regulating wheel through-feed centerless grinding is responsible for providing axial force by the movement when it is canted away from the surface of the grinding wheel. Through feed centerless grinding in grinder machines is generally very efficient since the process eliminates the separate feed mechanism prior to the grinding. However, this type of centerless grinding is only suitable for relatively simple profiles like the cylindrical shape of metal components.
Different from through feed form of grinding, end feed type of centerless grinding process feeds the metal parts axially into the working area on one side. The material will rest against an end stop subsequently. As the centerless grinding operation is completed, the metal parts will be fed in the opposite direction in order to remove them from the grinder. The end feed type of centerless grinding is greatly suitable for producing metal components with a tapered profile.
The third form of centerless grinding is in-feed centerless grinding. This style is commonly utilized to produce products with relatively complex profiles like an hourglass shape. Different from previous feeding methods that might pair with automatic systems, the metal parts require to be manually placed into the grinder machine. In addition, the regulating wheel is also adjusted into the desired place before the centerless grinding operation starts. Since the metal parts need to be shaped with complex and sophisticated contours accurately, the in-feed type of centerless grinding is more ideal than the methods of axially fed the materials through the machines.
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