Краткий справочник по резанию материалов на металлообрабатывающих станках TECHNICAL DATA

Краткий справочник по резанию материалов на металлообрабатывающих станках TECHNICAL DATA

Краткий справочник по резанию материалов на металлообрабатывающих станках TECHNICAL DATA _ TECHNIC THREADING DEPTH Features Advantages Disadvantages 9 Easy to use. (Standard programme for threading.) 9 Superior resistance to vibration. (Constant cutting force.) 9 Long chips generated during the final pass. 9 Complex calculation of cutting depth when changing the number of passes. 9 Reduced load on corner radius during the first half of the passes. 9 Easy chip control. (Optional setting of chip thickness) 9 Easy to calculate cutting depth when changing the number of passes. 9 Good chip control. 9 Subject to vibration in the later stages of cutting. (Increased cutting force) 9 in some cases, changing the NC programme is necessary. 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. FORMULAE Formulae to calculate infeed for each pass in a reduced series. Aapr ap = X I "V nap 1 Aapn Depth of cut n Actual pass ap Total depth of cut nap Number of passes b 1st pass 0.3 2nd pass 2 1 = 1 3rd pass 3 1=2 nth pass n 1 (Example) External threading (ISO Metric) Pitch 1.0mm ap 0.6mm nap 5 passes 1st Pass Aapi 2st Pass Aap2 3st Pass Aaps 4st Pass Aap 5st Pass Aaps 0.60 a/5-1 0.60 a/ 5 1 0.60 a/ 5 1 0.60 V 5-1 0.60 a/ 5 1 x V 0.3 =0.16 >0.16(AapO x - 2 1 =0.3 > 0.14 (Aap2 Aapi) x 3 1 = 0.42 > 0.12 (Aaps Aap2> x a/4 1 = 0.52 > 0.1 (Aap4 Aaps) x a/5 1 = 0.6 > 0.08 (Aaps Aap4> NC PROGRAMME FOR MODIFIED FLANK INFEED Example) M12x1.0 5 passes modified 5° External Threading Internal Threading GOO Z = 5.0 GOO Z = 5.0 X= 14.0 X= 10.0 G92U-4.34 Z 13.0 F1.0 G92U4.34 Z 13.0 F1.0 GOO W 0.07 GOO W 0.07 G92U-4.64 Z 13.0 F1.0 G92U4.64 Z 13.0F1.0 GOO W 0.06 GOO W 0.05 G92 U 4.88 Z 13.0 F1.0 G92U4.84 Z 13.0 F1.0 GOO W 0.05 GOO W 0.04 G92U-5.08 Z 13.0 F1.0 G92U5.02 Z 13.0 F1.0 GOO W 0.03 GOO W 0.03 G92 U 5.20 Z 13.0 F1.0 G92U5.14 Z 13.0 F1.0 GOO GOO 1984 Mitsubishi Materials