Throughfeed grinding

Throughfeed grinding

Centerless throughfeed grinding, also called traverse grinding, is one of the most economical grinding techniques for mass production. The workpieces run continuously with an axial feed through the grinding zone. This is possible by tilting the regulating wheel along its rotational axis. To ensure contact with all workpieces along the entire width of the wheel despite that tilt, the regulating wheel has a hyperbolic shape. The speed and inclination angle of the regulating wheel together determine the feed rate of the workpiece.

The workpieces are in contact along their top surfaces until they pass through the last section of the grinding zone. At this point, the circumference velocity of the regulating wheel disc is at its highest, as the circumference is highest here.

The machining process is extremely economical as the machine can be loaded while grinding is underway. The workpieces may pass through the grinding machine at over 20 m/min, and for example chain bolts with a length of 20 mm can be ground at up to 17 bolts per second. In conventional grinding procedures, the handling systems are often unable to keep up with this level of output.

General functionality

The workpieces are fed into the grinding zone axially by a handling system. Inside the grinding zone, the regulating wheel is responsible for the progress of the workpieces. To achieve this, it is often tilted by αR and rotated by rotational speed nR. The workpieces are machined as they pass continuously through the grinding gap.

Guideways guide the workpieces to the infeed and run-out. Material is removed as soon as the workpiece enters the grinding zone. Profiled workpieces are possible if they are to be machined only at the largest point of their diameter. It is also possible to process parts that significantly exceed the grinding zone length.

Fundamentals of Centerless Grinding - Other Topics

Fundamentals of Centerless Grinding

Centerless grinding or centerless cylindrical grinding is a special form of external cylindrical grinding. Unlike conventional cylindrical grounding, the workpiece does not require double sided centering and is ground "centerlessly."

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Plunge grinding

For centerless plunge grinding, the workpiece is ground using a plunge method, whereby the grinding wheel is fed along the workpiece. For this reason, the grinding and regulating wheel have a negative profile of the workpiece, provided with the help of a dressing tool.

More about plunge grinding
Advantages and disadvantages of the centerless grinding

Each grinding process has its advantages and disadvantages. You can learn more here about the concrete benefits of centerless external cylindrical grinding vs. traditional external cylindrical grinding.

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