From Ceramic Technology and Processing

1.0 THE GRINDING PROCESS

The scope of this chapter is limited. Grinding is by itself a skilled or semiskilled craft. The intent is not to teach how to grind a ceramic part. In-stead, the intent is to describe the process and offer some insight about how this affects the ceramic.

Ceramics are usually ground with bonded-diamond abrasives. There are two types of bonds in common use, metal and resinoid. Metal is rougher and lasts longer. Resinoid is gentler and wears out faster. Always use resinoid for finish grinding of fine-grained, dense ceramics as there is less surface damage to the part.

Tool Type and Grit Size

There are two types of metal-bonded, diamond-cutting tools. The sintered-powder, metallurgical type with included diamond grit and the surface bonded type with electroplated Ni on sedimented diamond grit. The latter is common in metallographic grinding and polishing. The powder-metal, bonded type is more common in the machine shop and is used for percision shaping of a part. Resin-bonded and diamond-bonded cutting tools also come in these two forms for similar uses. Abrasive points protrude from the surface of the grinding wheel, as schematically shown in Figure 9.1.


Figure 9.1: The Grinding Process. Abrasives damage the ceramic surface to an appreciable depth. Rubbing of the wheel on the surface can cause heating.

Grinding is a scratching process, leaving jagged scratch roots and sub surface cracks. In Figure 9.1, not all the abrasive grains stick out from the wheel surface the same distance, so the longest...


Products & Services
Wheel Dressers and Dressing Tools
Wheel dressers and dressing tools  are used to condition, true and dress grinding wheels. Dressing is the process of re-sharpening the tiny cutting edges on a grinding wheel’s surface.
Abrasive Files
Abrasive files are small stick or stone made of bonded abrasives or superabrasive coatings for deburring, finishing, lapping and polishing in hard to reach places and recesses.
Cutoff Wheels and Abrasive Saw Blades
Cut-off wheels and abrasive saw blades are used to cut bars, stock, pipes and other materials that are made of metal, concrete, or masonry.
Grinding Wheels
Grinding wheels are used for metal removal, dimensioning, and finishing. They consist of an integral shank, pin, shaft, or mandrel that drives a mounted wheel or blades.
Superabrasives and Diamond Tools
Superabrasives and diamond tools include grinding wheels, abrasive saw blades, wheel dressers, single-point tools, and other products that use diamond or cubic boron nitride (CBM) abrasive grains.

Topics of Interest

1.0 INTRODUCTION Crafting a ceramic is similar to building a pyramid. It starts with a base, which, in this case, is the starting grain or powders. Everything depends on the base, and when it is...

2.1 INTRODUCTION Grinding wheels and abrasive segments fall under the general category of 'bonded abrasive tools'. Such tools consist of hard abrasive grains or grits, which do the cutting, held in a...

5.5 GRINDING MECHANISMS: CBN WHEELS The analysis of grinding mechanisms for metallic materials in the previous section was for conventional abrasive wheels. With wheels containing CBN abrasives, the...

9.1 INTRODUCTION Most grinding operations are performed with the aid of a grinding fluid. Grinding fluids are generally considered to have two main roles: lubrication and cooling. Grinding fluids can...

5.8 HEAVY-DUTY GRINDING The objective in heavy-duty grinding is rapid material removal with only secondary concern for surface quality. Removal rates may be so big that the chips are readily visible...

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