Основной каталог Kyocera 2021 - 2022 - страница 985

Bolt countersink (Hexagon socket head cap screw)

Other applicationsOther applications Bolt countersink end millBolt countersink end mill

Recommended cutting conditions

★: 1st Recommendation ✩: 2nd Recommendation

Points at bolt countersinking

1. Carbon steel Increase the feed rate to fz=0.1 ~ 0.15 (mm/t) for preventing long chips at low feed rates. Chip control is good when setting (Vc=80m/min) for MEF11~MEF25, and (Vc=120m/min) for MEF26~MEF48.

2. Sticky materials Step feed is recommended for good chip control Increase the feed rate to fz=0.1 ~ 0.15 (mm/t) for preventing long chips at low feed rate (fz=0.05mm/t). Use cover to prevent accidents or injury by thick chips at higher feed rates.

3. Stainless steel Use a lower cutting speed. high cutting speeds cause chattering.

Cutting performance when shouldering

MEF bolt countersink end mill is also recommended of shouldering. ae Vc=80~120m/min S55C Dry Overhang length: Same as LH in the dimension table

• When shouldering, both side edge and bottom edges function.
• Both edges wear at the same time depending on ap. The insert uses 2 edges instead of 4. (Fig. 1)
• MEF type's side edge is designed to have a slight clearance for the countersinking. Therefore, worked side wall is approx. 1˚ inclined against the vertical face.

(Fig. 2)

approx. 1˚approx. 1˚approx. 1˚約approx. 1˚1˚

(89˚)(89˚)(89˚)(89˚)(89˚)

2 edges function Fig. 1 Fig. 2

JIS standard of T-slot (Extracted from B0952) (Unit: mm) A H B C

(Nominal size) Max. Min.

Description Cutting range

MEF11-S12 ~ MEF14-S12 MEF17-S16 MEF18-S16

DCX/6 DCX/3 DCX/2 Cutting width: ae(mm)

MEF20-S16 MEF22-S20 MEF25-S20

MEF39-S32 MEF43-S32 MEF48-S32

DCX/6 DCX/3 DCX/2 Cutting width: ae(mm)

A

B

Previous milling groove does not affect.