Kyocera - Основной каталог 2011-2012 ENG

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Guide for External Machining

Guide for External Machining

Point               Longitudinal turning after Grooving

Grooving Depth Over 0.5mm: For roughing (Refer to Fig. 1)

Before longitudinal turning, pull the tool back about 0.1mm after grooving,

instead of longitudinal turning subsequent to grooving.

(Failure to pull the tool back before traverse cutting will result in an unbalanced

load applied on only one side of the cutting edge.)                                                        Before Longitudinal turning, pull the
                                                                                                          tool back about 0.1mm after grooving,

                                                                                                               instead of Longitudinal turning
                                                                                                           subsequent to grooving. Grooving

                                                                                                             Depth Over 0.5mm: At roughing
                                                                                                                            Fig.1

Grooving Depth under 0.5mm: For finishing (Refer to Fig. 2)
Longitudinal turning subsequent to grooving is possible because shallow groove
depths relate a small load on the cutting edge.
(Dwell-motion is not necessary.)

                                                                                                                                                                                                         G

 Point                                                                                                    Traversing subsequent to grooving                                                              Grooving
                                                                                                           Grooving Depth under 0.5mm: At
     When widening the groove width (Refer to Fig. 3)                                                                      finishing
     Apply the “Step Turning”.                                                                                               Fig.2
     Then perform finishing.
     (For better chip control, over 0.5 mm ap is
     recommended.)
Note If machining is made toward the center but the center is
     not pressed, lower the feed rate.

                                                                                                          Fig.3

Case Studies

    17Cr3 SCr420H                 Grooving                           20CrMo5 SCM420                                  Grooving
                                                                                                                     Traversing
Gear                                     10                     Gear
Vc=113 164 m/min                                                Vc=170m/min
f=0.06 mm/rev                                                   f=0.15 mm/rev Roughing
Wet
GDM4020N-040GM                                                    0.10 mm/rev Finishing
                                                                ap=0.2mm Finishing
                        (PR1225)                                Wet
KGDL2525X-3T10S                                                 GDM4020N-040GM

                                                                                        (PR1215)
                                                                KGDR2525X-4T20S
                                                24
                                                           35
                                                                                                                                            73

                                                                                                                                                                                              38
                                                                                                                                                                                                    54

GM Chipbreaker                1500 pcs/C                        GM Chipbreaker                            250 pcs/C
      PR1225                                                         PR1215
                                            x6 longer life
    Competitor K    250 pcs/C                                          Competitor L                       200 pcs/C
PVD Coated Carbide                                              (Raughing: PVD Coated Carbide)

                                                                  (Finishing: Cermet)

Result                                                          Result

KGD type grooving toolholder + GM chipbreaker (PR1225) showed   GM chipbreaker reduced occurrence rate of tangle of chips (occurrence
6 times longer tool life than that of Competitor K.             rate 80% => 10%). The problem was persistent with Competitor L.
                                                                Machining productivity is improved.
Good chip control without burned chips.

                                  Competitor K  GM Chipbreaker

                                  (Evaluation by the user       Chips easily tangled Competitor I (Finishing) Smooth chip control GM Chipbreaker Finishing

                                                                                                                                Evaluation by the user

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