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Cutting Technology

Cutting Technology. chip removing the largest class of manufacturing activities in engineering production ~1.87 million machine tools ~$168 billion - the total value of the machining operation numerical control of machine tools flexible manufacturing. Single point tool operations

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Cutting Technology

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  1. Cutting Technology • chip removing • the largest class of manufacturing activities in engineering production • ~1.87 million machine tools • ~$168 billion - the total value of the machining operation • numerical control of machine tools • flexible manufacturing

  2. Single point tool operations • turning, boring, planing, and shaping

  3. the peripheral speed of the workpiece - the cutting speed • the mean value • the depth of cut is • the metal removal rate is • b- chip width • h- chip thickness • fr - feed per revolution

  4. Tool geometry •  - the side cutting edge angle • the tool consists of a cutting insert and a tool holder

  5. The tools

  6. boring tools

  7. classical system

  8. 7 - turn a taper • 8 - rough turn a tapered thread • 9 - finish the thread • 10 - drill a short hole • 11 - bore the hole to a larger and more accurate diameter • 12 - cut an internal groove • 13 - cut a short thread in the end of the hole

  9. Automated machine tools • lead, set, clamp, and change tools • control the path of the tool relative to the workpiece • carry out measurements

  10. Drilling operations

  11. the metal removal rate: • d - hole diameter • fr - feed rate (feed per revolution) • n - rotational speed • the chip area for each edge: • ft = fr/2 = feed per tooth • the tangential force in the direction of the cutting speed v is: • the torque is: • the power is: • Ks - specific force

  12. Drilling Machines

  13. the positioning of the spindle relative to the workpiece for the proper location of the hole • if the location is specified to a close tolerance, this cannot be accomplished manually without additional aids

  14. jig boring machines • accurately positioned x, y coordinate motions to drill and bore holes in jigs with precise positions • economical for medium size series of workpieces • small-lot production on NC drilling machines • mass production - use multispindle drilling machines as a part of a transfer line

  15. Multipoint tool operations

  16. the tooth period: • the mean metal removal rate is: • ar - the radial depth of cut • aa - the axial depth of cut • f - feed rate • the mean power is:

  17. Ways of clamping milling cutters

  18. Broaching • motion: rectilinear • no feed motion • the teeth on the tool are so arranged that they increase in height • the operation is carried out in one pass • suited to mass production of surfaces that are straight in at lease one direction • for machining internal and external surfaces • gears

  19. the geometry of the broach completely determines the whole operation • the machine supplies one linear cutting motion • pull • push type machine • specialized (workpiece moves while the tool is stationary)

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