2014-2015 Полный каталог инструмента Mitsubishi (Митсубиси) EN
для заказа - info@mitsubishitools.ru
THREADING
SELECTING CUTTING CONDITIONS
Priority
Tool Life Cutting Force Surface Finish Precision of Thread Chips Discharge Efficiency
(Reduced Passes)
u u
Threading Radial (] : Modified) uu u
Methods Flank
(] : Modified) u
Cutting Fixed Cutting Depth u
Depth Fixed Cut Area u u u u u
Tool life and surface finish accuracy can be increased by changing the threading method from flank infeed to modified flank infeed.
** Chip control can be improved by increasing the cutting depth in the later half of passes.
THREADING CUTTING DEPTH AND THE NUMBER OF PASSES FEATURES AND BENEFITS OF MITSUBISHI PRODUCTS
y Selection of the appropriate cutting depth • Insert grades with high wear and plastic deformation
and the right number of passes is vital for resistance, specially produced for threading tools, ensure
threading. highly efficient cutting by enabling high-speed machining
and a reduced number of passes.
• For most threading, use a "threading cycle program,"
which has originally been installed on machines, and Machining Cost
specify "total cutting depth" and "cutting depth in the first Reduction
or final pass."
• Cutting depth and the number of passes are easy to
change for the radial infeed method, thus making it easy
to determine the appropriate cutting conditions.
ADVICE ON IMPROVED THREADING y Preventing vibration
y Increasing tool life • Change to flank or modified infeed.
• When using radial infeed, reduce cutting depth in the later
• To prevent damage to the nose radius -
Recommended method - Modified flank infeed half of passes and lower the cutting speed.
• To have uniform flank wear on both sides of a cutting edge -
Recommended method - Radial infeed y Increased surface finish accuracy
• To prevent crater wear -
Recommended method - Flank infeed • A final wiping pass should be performed at the same depth
of cut as the last regular pass.
y Preventing chip problems
• When using the flank infeed method, change to radial
• Change to flank or modified infeed. infeed only during the final pass.
• During radial infeed cutting, use an inverted holder and
change the coolant supply to a downward direction.
• When using the radial infeed method, set the minimum
cutting depth at around 0.2mm to make the chips thicker.
y To achieve highly efficient machining
• Increase cutting speed. (Dependant on the maximum
revolution and rigidity of the machine.)
• Reduce the number of passes. (Reduce by 30-40%.)
• A reduced number of passes can improve chip discharge
because of the thicker chips generated.
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