Blog

Example of copper and ceramic machining with PCD spiral flute end mill

Example of copper and ceramic machining with PCD spiral flute end mill

Machining of hardened steel with cBN end mill

Endurance data – Cutting test using cBN radius end mill

Purpose of test
A cBN radius end mill was tested for slot machining in hard materials, which is a difficult process with conventional carbide end mills due to their machining inefficiency and limited tool life.

Test environment
Machine YBM-640V
Work material SLD(HRC60)
Cutting fluid Oil mist
Tool used cBN radius end mill (φ1 × R 0.1 × 6 (effective length)), manufactured by Kyowa

Test description
Cut slots 1 mm wide by 6 mm deep in a block measuring 80×60×30 mm, followed by visual evaluation at 200× magnification.

Machining conditions
Spindle rotational frequency :18,000rpm(56.5m/min)
Feed speed :500mm/min(0.013mm/tooth)
Cutting :10 μm × 600 strokes per slot
Cutting length :80 mm × 600 strokes = 48000 mm (48 m) per slot
Machining time :1 h 42 min per slot

Test results
A cBN radius end mill was able to cut ten slots 1 mm wide by 6 mm deep by 80 mm long in a hard material. However, beginning with the fifth slot, traces of wear or chipping can be seen at the corners. The total cutting length attempted in this test was 48 mm × 10 slots = 480 mm, but a practical length is 48 mm × 4 slots = 192 mm. (Only one slot can be cut with a carbide end mill.) However, increasing the cutting speed (1.5 to 2 times faster) would provide more favorable conditions.

Data on fine machining of glass with ball end mill

Table 1 Cutting conditions
Workpiece Pyrex
Tool cBN, R0.2mm
Feed rate 0.24mm/min
Axial depth of cut 20μm
Rotation rate 20000rpm, 40000rpm, 60000rpm
Effects of rotational frequency and cutting oil on machined surfaces
Rotational frequency Machined edge Machined surface
20000rpm ti02_img01 ti02_img02
40000rpm ti02_img03 ti02_img04
60000rpm ti02_img05 ti02_img06

Related post

PRESS RELEASE

  1. Single-flute” and “double-flute
    Successful development of “solid single-crystal di...

RECOMMENDED ARTICLES

  1. Single-flute” and “double-flute
    Successful development of “solid single-crystal di...
  2. Advantages of cBN tools in hardened steel machining
    Advantages of cBN tools in hardened steel machin...
  3. Advantages of PCD tools in aluminum (non-ferrous metal) processing
    Advantages of PCD tools in aluminum (non-ferrous...
Return Top