Grinding and advanced machining review questions: 1.What is creep feed grinding?
ID: 1717207 • Letter: G
Question
Grinding and advanced machining review questions:
1.What is creep feed grinding?
2.How is the shape of grinding wheels maintained?
3.What is the difference between honing and lapping?
4.Name one good reason to use thermal deburring.
5.Name one super handy feature of chemical blanking?
6.What process would you use to shape an extrusion die made from heat treated high hardness steel?
7.Name two methods of cutting relatively high accuracy custom spur gears
. 8.Which advanced machining processes can cut stone and ceramics?
Explanation / Answer
1. Creep Feed Grinding:
Creep-feed grinding is an abrasive machining process mainly used to produce slots or intricate forms in difficult-to-grind materials such as prehardened tool steels and high- temperature nickel-base aerospace alloys. The process utilizes a grinding wheel to impart forms previously associated with milling or broaching operations into a workpiece in one pass, at full depth of cut and very slow table speeds. Creep-feed grinding increases productivity and has greater production efficiencies.
2. Truing and dressing are main processes to maintain the shape of grinding wheel.
Truing is the process of making a grinding wheel round and concentric with the grinding wheel spindle axis. Truing is also the process of forming a specific shape on the face of the wheel. Dressing is the process of conditioning the surface of a trued wheel to expose the grain for efficient grinding action.
3.Both lapping and honing are a kind of grinding process used to maintain surface finish. In both cases, an abrasive material is used for better surface finish.
Lapping is a final abrasive finishing operation that produces extreme dimensional accuracy, corrects minor imperfections, refines surface finish and produces close fit between mating surfaces. Honing is a low-velocity abrading process. It uses spring loaded abrasive stones as the cutting tool. The stone may be composed of aluminum oxide, silicon oxide, or in some cases diamond grains held together by a vitrified or organic bond.
4. Benifits of thermal deburring( thermal energy method)
5. Chemical blanking is a milling process which uses the chemical to do the machining operation. Used for pockets, contours and overall metal removal. Shallow cavities are etched on the surface of a metal workpiece -most commonly, on large aerospace structures.
6. Casting, sintering, heat treating can be used to shape an extrusion die at high temperature and pressure.
7. High accuracy spur gears can be cut easily by cnc milling, and also by some NT machining like invomilling
8. Water jet matching, laser cutting, ultra sonic machining etc. can be used to machine ceramincs and stone.
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