Kyocera - Каталог Сверление 2013 ENG

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Drilling & Core Drilling Basic Formulas

                                                                                                                                  Technical
                                                                                                                                     Information

SURFACE SPEED PER MINUTE                                                HORSEPOWER REQUIRED AT THE SPINDLE                        Drilling
SFM = 0.262 x DIA x RPM                                                 HPS = Q x UHP

REVOLUTIONS PER MINUTE                                                  HORSEPOWER REQUIRED AT THE MOTOR

RPM=  3.82 x SFM                                                        HPM=     HPS
           DIA                                                                   EFF

FEEDRATE (inches per minute)                                            TIME IN CUT
IPM = IPR x RPM
                                                                        T=  15.7 x DIA x LOC
FEEDRATE (inches per revolution)                                                SFM x IPR
IPR=IPT x N
                                                                        	 or

METAL REMOVAL RATE (in3 per minute)                                     T=    60 x LOC
DRILL: Q=3 x DIA x IPR x SFM                                                     IPM
COREDRILL: Q=12 x DOC x IPR x SFM

 Definition of Terms                                      N = NUMBER OF EFFECTIVE FLUTES
                                                           	 N = 1 FOR DRILLS
            DIA = DIAMETER OF THE DRILL (INCHES)           	 N = 2 FOR COREDRILLS
            DOC = DEPTH OF CUT (INCHES)                    Q = METAL REMOVAL RATE (CUBIC INCHES PER MINUTE)
            EFF = MACHINE EFFICIENCY                       RPM = REVOLUTIONS PER MINUTE
            HPM = HORSEPOWER AT MOTOR                      SFM = SURFACE SPEED (FEET PER MINUTE)
            HPS = HORSEPOWER AT SPINDLE                    T = TIME (SECONDS)
            IPM = FEEDRATE (INCHES PER MINUTE)             UHP = UNIT HORSEPOWER (SEE TABLE BELOW)
            IPR = FEEDRATE (INCHES PER REVOLUTION)
            IPT = CHIPLOAD (INCHES PER TOOTH)
            LOC = LENGTH OF CUT (INCHES)

                                            UNIT HORSEPOWER FACTORS

      Material        Hardness (BHN)  UHP Factor (HP/in3/min) Material      Hardness (BHN)               UHP Factor (HP/in3/min)
      Aluminum        ---                                                                                0.80
      Brass           ---             0.25          1050                    225                          0.70
      Copper          ---                                                                                0.67
      Gray Cast Iron  200             0.25          4140                    275                          1.30
      Nodular Iron    225                                                                                0.62
      Inconel 700     330             0.30          52100                   225                          0.73
      1020            165
                                      0.33          6150                    375

                                      0.54          Cast Steel              225

                                      1.10          Stainless Steel         225

                                      0.58

                                            kyocera@kyocera-tools.ru                                                              98
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