Основной каталог Kyocera 2021 - 2022 - страница 980

Guide for pecking

Depth of pecking X Refer to max. cutting depth (Pd) shown in the lower table of previous page. (Pd Shows the maximum plunge depth.) When traversing after pecking 1. Reduce the table feed by 50% until the center core part (do not forget to grind) is completely cut off. (The internal cutting edge's radial rake angle is large in the negative direction)

2. The min. cutting length “X” for flat bottom surface is as follows. Center core DC

Guide for ramping (Slant milling) L

• Ramping angle should be RMPX (Maximum ramping angle) or under in the above cutting conditions.
• Feed rate should be 70% or under of the

above cutting conditions. Formula of the cutting length “L” at max. ramping angle ap RMPX L = tan RMPX ap

Guide for helical milling

• Sinking depth (h) per revolution when helical milling should be max. ap or under in the above cutting conditions. [When cutting dia. øDh1≤øDh<øDh2] Ramping angle (with trajectory of the center line of tool) should be RMPX (Maximum ramping angle) or under in the above cutting conditions. Dh

ø Center core part

• Feed rate should be 70% or under of the above cutting conditions.

remains after machining.

• Down-cut machining is recommended.

(Not removable with the same cutter)

Helical milling factors

DC DC (Cutting dia.) [When cutting dia. øDh2≤øDh≤øDh3] Center core part øDh øDs (How to find diameter of trajectory remains after machining. of tool's center line) (Removable by traversing

πxøDs Formula for sinking depth (h) DC

α h=πxøDsxtanα Ramping angle (h should be ap or under) (α should be RMPX or under) Please refer to previous page the list for øDh1 ~ Dh3. Max. ap and usable edges

(mm) Insert corner-R Usable edges

R4 R5 R6 R8

Case studies SUS304 SKD61(47~49HRC)

• Nozzle parts
• Mold part Slant face
• Vc = 113m/min
• Vc = 125m/min
• ap x ae = 1.0 x 65mm
• ap x ae = 1.0~
• fz = 0.14mm/t 2.0x 10mm
• Dry 110
• fz = 0.25mm/t
• MRX100R-12-9T-M
• Dry 380 230

(9 flutes) 65 MRX20-S20-08-2T

• RPGT1204M0ER-SM (2 flutes)

(PR1535) 4.5 times longer RDGT0803M0ER-GM More than double

tool life (PR1525) tool life

1 pc unstable tool life

• High cost efficiency with 4.5 times longer tool life and 1.5 times more insert edges.
• MRX prevented burr formation and improved surface finish.
• Conventional tool machined only 1 pc of workpiece due to unstable tool life, but MRX doubled the tool life with stable machining.