Correct
selection of CNC machining cuttings is a major part of the CNC machining part
cutting principle course. Metal machining has three basic principles:
1. CNCmachining feed rate
F mainly
depends on the surface roughness requirements of the workpiece. When finishing,
the surface requirements are high, and the amount of the cutter is small:
0.06-0.12mm/spindle per revolution. When roughing, it can be larger. It is
mainly determined by the tool strength, generally 0.3 or more. When the tool
main back angle is large, the tool strength is poor, and the feed amount cannot
be too large. Also consider the power of the machine, the rigidity of the workpiece
and the tool. The NC program uses two types of feeds: mm/min, mm/spindle per
revolution, and the units used above are mm/spindle per revolution. If mm/min
is used, the formula can be converted: the feed per minute = each Turning tool
amount * Spindle revolutions per minute.
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cnc machining |
2,
cutting speed
To
select the spindle revolutions per minute, you must first know what the cutting
line speed V should take. Selection of V: depends on tool material, workpiece
material, processing conditions, etc.
Processing
conditions: roughing, V is lower; finishing, V is higher. The rigidity of the
machine tool, workpiece, and tool is poor, and V is low. If the S used by the
NC program is the number of spindle revolutions per minute, then S:S (spindle
revolutions per minute) = V (cutting line speed) * 1000 / (3.1416 * workpiece)
should be calculated according to the workpiece diameter and the cutting line
speed V Diameter) If the NC program uses a constant line speed, then S can
directly use the cutting line speed V (m/min)
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cnc machining |
3,
eating knife depth
For cnc
finishing, it is generally possible to take 0.5 (radius value) or less. When
roughing, depending on the workpiece, tool, and machine condition, the general
small lathe (maximum machining diameter is 400mm or less) is turned on the 45th
steel in the normalized state, and the depth of the cutter in the radial
direction is generally not more than 5mm. In addition, it should be noted that
if the spindle shifting of the lathe is using ordinary variable frequency speed
regulation, when the spindle rotates at a very low speed per minute (less than
100-200 rpm), the motor output power will be significantly reduced. Depth and
feed can only be achieved very small.cnc machining.
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