Design of single point cutting tool

By:Sonu SinghCollege of Engineering,Bbsr (1301219123)

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2 Introduction Types of tools Tool geometry Tool designation

ASA System ORS System

Effects of back rake angle on machining Effect of side rake angle Effect of relief angle Effect of cutting edge angle Effect of nose radius on machining Tool material Conclusion References Thank you

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3Introduction©

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Design of single point cutting tool is an important aspect of tool engineering. This unit deals with the design of tool shank, design of single point cutting tool, and various forces involved during machining of the workpiece. Strength and rigidity of tool is also taken into account while designing single point cutting tool.

4Types of tool Single point cutting tool

One cutting tip is available e.g. lathe machine tools, shaping tools, planning tools, etc.

Multi-point cutting tool More than one tip is available e.g. milling cutter, grinding wheel, drill, etc.

MULTIPOINT CUTTING TOOLS

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5Tool Geometry©

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Both material and geometry of the cutting tools play very important roles on their performances in achieving effectiveness, efficiency and overall economy of machining

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Tool Designation

1. ASA System (American Standard Association)

2. ORS System (Orthogonal Rake System)

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ASA System

Angles are measured with reference to 3 mutually perpendicular planes.

Understanding is easy.

Measurements of angles is also easy.

Analysis of machining is difficult.

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ORS System

Angles measured with reference to major cutting edge.

Analysis is easy.

Understanding is difficult.

For measurement of angles, we require special fixtures.

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9Effect of Back rake angle on machining

As back rake angle increases,• Strength of tool increases.• Forces on tool decreases.• Power required for machining is decreases.• Tool life increases.

Maximum +ve rake angle used is 45 degree.0 degree rake angle used for brass workpieces.Also for thread cutting 0 degree rake angle is used. -ve rake angle is used carbide cutting tool. -ve rake angle used is 10 degree only.

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10Effect of side rake angle on machining

As side rake angle increases,

• Strength of tool increases.

• Forces are decreases but in small amount.

• Power is also decreases but in small amount.

• Tool life is increases.

Generally side rake angle is in between 5 to 15 degree.

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11Effect of relief angle Provided to avoid rubbing between tool and workpiece. As relief angle increases,

o Strength decreases.o Forces are slightly decreases.o Tool life is slightly increases.

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12Effect of cutting edge angle

Mainly influence the surface finish of component.By reducing end cutting angle or by increasing side cutting

angle, nose size increases and surface finish also increases.

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13Effect of nose radius on Machining

Mainly influence the surface finish.With increase in nose radius, surface finish increases.

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14Tool material High carbon steel High speed steel Stellite Cemented carbide+ Ceramics Cermets Diamond CBN (Cubic Boron Nitrite) or Borozone Ucon Sialon

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15Conclusion

There are many advantages of single point cutting tool, but there also many disadvantages.

Many disadvantages of single point cutting tool are reduced by multi point cutting tool.

In this we see geometry of cutting tool, material of cutting tool, etc.

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16References©

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http://www.design of single point cutting tools.com

http://en.wikipedia.org/wiki/http://www.slideshare.net

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Thank you!

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