The feeds and cutting speeds of drilling determine the cost the drilling operation, like productive, hole quality and tools cost etc.  To choose the suitable feeds and cutting speeds parameters, we have to understand the effects of cutting speed and feed of the drilling operation.

The relationship of VC (cutting speed) and Fn (Feed rate)

The relationship of VC (cutting speed) and Fn (Feed rate)

The relationship of VC (cutting speed) and Fn (Feed rate)

1.Effects of cutting speed – vc (m/min(ft/min))

Cutting speed is the main factor, along with material hardness, that affects tool life and power consumption. Firstly, according to the past study of Sandvik, Cutting speed is the largest factor determining tool life, which is affected by the power (kW) and torque (Nm) of the driling Machine. Normally Higher speed generates higher temperature and increased flank wear, especially on the peripheral corner. Higher speed is also beneficial for chip formation in certain soft, long-chipping materials, i.e. low carbon steel

The features of high cutting speeds and low cutting speed of the drilling

  • Too high cutting speed:
    – Rapid flank wear
    – Plastic deformation
    – Poor hole quality and bad hole tolerance

Too low cutting speed:
– Built-up edge
– Bad chip evacuation
– Longer time in cut

 

2. Effects of feeds of drilling fn (mm/r(in/r))

Besides cutting speeds, feeds of drilling fn (mm/r(in/r)) is another key factor that affects tool life and power consumption, which Influences chip formation, surface finish and hole quality which is also affected by the power (kW) and torque (Nm) of the drilling Machine. High feed affects the feed force Ff (N), to be considered when conditions are unstable, which also contributes to mechanical and thermal stress

The features of high feed rate and feed rate of the drilling

  • High feed rate:
    – Harder chip breaking
    – Less time in cutting
    – Less tool wear but increased risk for drill breakages
    – lowhole quality
  • Low feed rate:
    – Longer, thinner chips
    – Quality improvementof hole
    – Accelerated drills wear
    – Longer time in cutting

 

When drilling a thin/weak/small component, which it is difficult to be firmly fixed, the feed rate should be kept low. For the sample below, for the thin Aluminum part below, the feed rate have to be kept low to get good quality hole.

aluminium parts drilling

 

To sum up, when we decide the cutting parameters, we have to consider the features of cutting speed and feed rate. If you need more advice, please contact fidelity tools.  sales@fidelitytools.cn

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