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non traditional machining notes 6th sem mechanical vtu notes pdf

When people hear the word "machining" they generally think of machines that utilize mechanical energy to remove material from the work piece. Milling machines, saws and lathes are some of the most common machines using mechanical energy to remove material. The tool makes contact with the work piece and the resulting shear causes the material to flow over the tool. All traditional forms of metal cutting use shear as the primary method of material removal. However, there are other sources of energy at work.

Chemical energy has a significant effect on every turning operation. Think of the effect that different kinds of coolants have on the cutting action of a tool. Some amount of chemical energy is being used in most metal cutting operations. All forms of manufacturing use more than one type of energy.

The category of nontraditional machining covers a broad range of technologies, including some that are used on a large scale, and others that are only used in unique or proprietary applications. These machining methods generally have higher energy requirements and slower throughputs than traditional machining, but have been developed for applications where traditional machining methods were impractical, incapable, or uneconomical.

Nontraditional machining can be thought of as operations that do not use shear as their primary source of energy. For example, abrasive water jet operations use mechanical energy, but material is removed by erosion.

Non traditional machining methods are typically divided into the following categories:

Mechanical - Ultrasonic Machining, Rotary Ultrasonic Machining, Ultrasonically Assisted Machining

Electrical - Electrochemical Discharge Grinding, Electrochemical Grinding, Electrochemical Honing,Hone-Forming, Electrochemical Machining, Electrochemical Turning, Shaped Tube Electrolytic Machining, Electro-Stream

Thermal - Electron Beam Machining, Electrical Discharge Machining, Electrical Discharge Wire Cutting, Electrical Discharge Grinding, Laser Beam Machining.

Chemical - Chemical Milling, Photochemical Machining
These machine tools were developed primarily to shape the ultrahard alloys used in heavy industry and in aerospace applications and to shape and etch the ultrathin materials used in such electronic devices as microprocessors.