Grinding - Creep Feed and Surface
The creep-feed process allows high stock removal rates in difficult-to-grind materials such as high-performance alloys and hardened metals. This full-depth, single-pass grinding removes large amounts of stock from soft or hard materials while slowing the table feed. CNC-controlled machines operate in reciprocating or creep-feed modes to provide consistent results to tolerances within 0.0002".
Surface grinding is applied to straight flat work, yielding tolerances within 0.0002". Surface profile grinding is used for gear racks and turbines. The metallic materials processed with these grinding methods are steel alloys, Inconel, titanium and carbides. Nonmetallics handled are Kevlar, fiberglass and plastics. Ceramic compounds also are ground.
Vitrified, aluminum oxide and silicone wheels are used in creep-feed grinding at speeds measured in meters per second. With creep-feed grinding it takes less time to finish a part and imparts less stress on the part while grinding. A drawback of creep-feed grinding is that something in the surface finish is sacrificed, but even with that, the resulting finish is better than that of a milled or conventionally machined surface.
The fully equipped grinding shop will include superabrasive and surface profile grinders, surface grinders, optical profile grinders and universal cylindrical grinders. The toolroom should include lathes, milling machines, drill presses, saws and small tools.
To effect a significant level of quality in these operations it is necessary to inspect with comparators, height and gage blocks, sine plates, hardness testers, micrometers, indicators and CAD equipment.
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