manufacturing processes
DESCRIPTION
Manufacturing Processes. Dr. Apiwat Muttamara. Milling. Cutting Speed. Where: N = Spindle Speed (RPM) CS = Cutting Speed of Metal (m/min) d = Diameter of Workpiece. Cutting Speed. Feed. - PowerPoint PPT PresentationTRANSCRIPT
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Manufacturing Processes
• Dr. Apiwat Muttamara
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Milling
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Cutting Speed
• • Where:
N = Spindle Speed (RPM)CS = Cutting Speed of Metal (m/min)d = Diameter of Workpiece
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Cutting Speed
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Feed
• The term `feed' is used to describe the distance the tool moves per revolution of the workpiece and depends largely on the surface finish required. For roughing out a soft material a feed
of up to 0.25 mm per revolution may be used. With tougher materials this should be reduced to
a maximum of 0.10 mm/rev. Finishing requires a finer feed then what is recommended.
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Types of Milling Machine
• Horizontal Vertical
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End mill
• Cutting tools for Vertical Milling a. End Mills
Rough Cut End MillsFor rapid metal removal.
• End Mill
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Slot Drill
Face Milling Cutters
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INSERT ENDMILL
• INSERT ENDMILL
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Ballnose
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Spindle Speed
• Spindle speed in (R.P.M.)
where -- N = R.P.M. of the cutterCS = Linear Cutting Speed of the material in m/min. ( see table 1 ) d = Diameter of cutter in mm
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Feed Rate
• Feed rate (F) is defined as the rate of travel of the workpiece in mm/min.
• where -- F = table feed in mm/min f = movement per tooth of cutter in mm ( see table 1 ) u = number of teeth of cutter N = R.P.M. of the cutter
•F = f . u . N
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Table 1
•F = f . u . N
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Depth of Cut
• Depth of cut is directly related to the efficiency of the cutting process.
• For a certain type of cutter, a typical range of cut will be recommended by the supplier.
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Down Cut,Climb MillingUp Cut• direction opposite to the
table. • conventional milling
Feed Direction
• Backlash• CNC milling machine. • Require less power in feeding the table • Give a better surface finish on the
workpiece.
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