Basics of the Cylindrical Grinder 232

Basics of the Cylindrical Grinder provides a comprehensive introduction to different types and components of cylindrical grinding machines. The main methods of cylindrical grinding are plunge grinding and traverse grinding. The main types of cylindrical grinders are plain, universal, automated, and limited-purpose. Grinders may also be categorized by their method of workholding and method of control. Grinding wheels, maintenance, coolant, and grinding variables vary based on the operation.

Cylindrical grinding is a common operation performed to finish parts and bring them to tolerance. A cylindrical grinder operator must be familiar with the machine itself, as well as how to select and utilize wheels, workholding, and coolant, in order for the grinding operation to be successful. This foundational knowledge is necessary to reduce scrap, increase quality and production rates, and lower costs.

• Difficulty Intermediate

• Format Online

• Number of Lessons 18

• Language English

Grinding Process

The chip thickness and therefore the cutting force on the single grain are lower with creep feed grinding than with conventional traverse grinding. There are no recurring impact loads on the grinding wheel so that the abrasive grains can be held by the bond matrix longer before the grains break out. On the other hand, the thermal load and the total cutting forces are higher.

In creep feed grinding, the higher cutting forces require significantly higher static and dynamic rigidity and higher drive performance of the grinding machine than in conventional traverse grinding. The high thermal load during creep feed grinding not only represents a high load on the tool and grinding machine, but it can also damage the workpiece material and can lead to cracks and structural changes. Such structural changes do not occur, or only occur to a limited degree during conventional traverse grinding and are removed by the subsequent pass.

During conventional traverse grinding, the contact surface of the tool and the workpiece can be easily supplied with cooling lubricant due to the short length of the contact area. Creep-feed grinding requires the cooling of a much larger contact surface and the dissipation of more heat due to the higher friction. Therefore, the cooling lubricant must be supplied at high pressure and high flow rates through nozzles and supply lines with defined shapes.

• Difficulty Intermediate

• Format Online

• Number of Lessons 18

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• Language English

Grinding Process

The chip thickness and therefore the cutting force on the single grain are lower with creep feed grinding than with conventional traverse grinding. There are no recurring impact loads on the grinding wheel so that the abrasive grains can be held by the bond matrix longer before the grains break out. On the other hand, the thermal load and the total cutting forces are higher.

In creep feed grinding, the higher cutting forces require significantly higher static and dynamic rigidity and higher drive performance of the grinding machine than in conventional traverse grinding. The high thermal load during creep feed grinding not only represents a high load on the tool and grinding machine, but it can also damage the workpiece material and can lead to cracks and structural changes. Such structural changes do not occur, or only occur to a limited degree during conventional traverse grinding and are removed by the subsequent pass.

During conventional traverse grinding, the contact surface of the tool and the workpiece can be easily supplied with cooling lubricant due to the short length of the contact area. Creep-feed grinding requires the cooling of a much larger contact surface and the dissipation of more heat due to the higher friction. Therefore, the cooling lubricant must be supplied at high pressure and high flow rates through nozzles and supply lines with defined shapes.

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