2014-2015 Полный каталог инструмента Mitsubishi (Митсубиси) EN

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THREADING DEPTH                                                                              Features

        V1 V1=V2                                               Advantages                                  Disadvantages

                                                V2  a	Easy to use.                           a	Long chips generated during the
                                                    	 (Standard programme for threading.)    	 final pass.

                                                    a	Superior resistance to vibration.      a	Complex calculation of cutting depth
                                                    	 (Constant cutting force.)              	 when changing the number of passes.

           Fixed cut area                           a	Reduced load on nose radius during    a	Subject to vibration in the later
                                                       the first half of the passes.            stages of cutting.
                           X1=X2
                                                    a	Easy chip control.                     	 (Increased cutting force)
X1                                                  	 (Optional setting of chip thickness)
                                                                                             a	In some cases, changing the NC
                                          X2        a	Easy to calculate cutting depth when     programme is necessary.
                                                       changing the number of passes.
                                                                                                                                     THREADING
Fixed cutting depth                                 a	Good chip control.

*	It is recommended to set the depth of cut of the final pass to 0.05mm  0.025mm.

	 Large cutting depths can cause vibration, leading to a poor surface finish.

a FORMULAE

y Formulae to calculate infeed for each pass in a reduced series.

          ap                                        (Example)
        nap  1
]apn =                        Xb                    External threading (ISO Metric)

                                                    Pitch	: 1.0mm

                                                    ap	 : 0.6mm

]apn :	Depth of cut                                 nap	 : 5 passes
n :	Actual pass
ap :	Total depth of cut                             1st Pass   ]ap1 =        0.60        X   0.3 = 0.16    0.16 (]ap1)
nap :	Number of passes                                                       51             2  1 = 0.3   0.14 (]ap2 ]ap1)
b :	1st pass	 0.3                                                                            3  1 = 0.42  0.12 (]ap3 ]ap2)
                                                    2nd Pass ]ap2 =          0.60        X   4  1 = 0.52  0.1 (]ap4 ]ap3)
       	 2nd pass	 2  1 = 1                                                 51             5  1 = 0.6   0.08 (]ap5 ]ap4)
       	 3rd pass	 3  1 = 2
       	•                                           3rd Pass ]ap3 =          0.60        X
       	•                                                                    51
       	 nth pass	 n  1
                                                    4th Pass ]ap4 =          0.60        X
                                                                             51

                                                    5th Pass ]ap5 =          0.60        X
                                                                             51

aNC PROGRAMME FOR MODIFIED FLANK INFEED

y Example) M121.0 5 passes modified 5°

External Threading                                  Internal Threading

G00 Z = 5.0                                         G00 Z = 5.0

      X = 14.0                                            X = 10.0
G92 U  4.34 Z  13.0 F1.0                          G92 U4.34 Z  13.0 F1.0
G00 W  0.07                                        G00 W  0.07
G92 U  4.64 Z  13.0 F1.0                          G92 U4.64 Z  13.0 F1.0
G00 W  0.06                                        G00 W  0.05
G92 U  4.88 Z  13.0 F1.0                          G92 U4.84 Z  13.0 F1.0
G00 W  0.05                                        G00 W  0.04
G92 U  5.08 Z  13.0 F1.0                          G92 U5.02 Z  13.0 F1.0
G00 W  0.03                                        G00 W  0.03
G92 U  5.20 Z  13.0 F1.0                          G92 U5.14 Z  13.0 F1.0

G00                                                 G00

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