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Cutting Tools

1993 Edition, January 1, 1993

Complete Document



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Active, Most Current

EN
Additional Comments:
B0583 * ISBN: 9780901716484
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Product Details:

  • Revision: 1993 Edition, January 1, 1993
  • Published Date: January 1993
  • Status: Active, Most Current
  • Document Language: English
  • Published By: Maney Publishing (MANEY)
  • Page Count: 214
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

INTRODUCTION

This book does not deal with cutting theory. It is intended to be of help to people who know how to operate machine tools but often find it difficult to understand the recommendations for tool selection, particularly in the case of hardmetal.

The range of materials which one can use for cutting has been in a continuous state of development since the 1920s. We are now faced with the possibility of choosing from some nine classes of cutting material and then, having decided on the class of material we will use, we often have to make a further choice from within that group.

Once the cutting material has been selected cutting edge geometry comes into the equation. The rake angle, the corner radius, the clearance angle, the condition of the cutting edge itself (e.g. sharp, slight radius etc.) all playa part in optimising the performance of the chosen cutting material.

So called 'long chipping' workpiece materials (this covers almost all steels) need to have special grooves either ground or formed into the rake face of the cutting tool immediately behind the cutting edge ..These grooves control the way the chip flows. Carefully designed grooves make the chip turn over on itself causing it to break into small individual pieces shaped like a figure '6' or '9'. Such pieces are ideal from the operator safety aspect and also ensure good swarf clearance and transportation. This is a vital factor with CNC machines, machining centres and flexible machining systems.

The acceptance of indexable insert tooling by the market during the 1960s has brought tremendous benefits to machine tool users. It has enabled the production of highly sophisticated chipgrooves in the indexable inserts by direct pressing techniques. It is impossible to reproduce such grooves by grinding which in any case is far too expensive. It has also resulted in the setting up of an international standard designation system for both inserts and toolholders.

Edited by: R. Edwards