Общий каталог Mitsubishi 2020 - 2021 - страница 1725

EFFECTS OF CUTTING

CONDITIONS FOR TURNING

y FEED

In cutting with a general holder, feed is the distance a holder moves per work material revolution. In milling, feed is the distance a machine table moves per cutter revolution divided by number of inserts. Thus, it is indicated as feed per tooth. Feed rate relates to finished surface roughness.

a Effects of Feed

1. Decreasing feed rate results in flank wear and shortens tool life. 2. Increasing feed rate increases cutting temperature and flank wear. However, effects on the tool life is minimal compared to cutting speed. 3. Increasing feed rate improves machining efficiency. Feed (IPR)

Cutting Conditions Work Material : AISI 4340 Grade : P10

Insert : 0-0-5-5-35-35-0.3 mm Depth of Cut ap=.040 inch Cutting Speed vc=660 SFM Cutting Time Tc=10 min Feed and Flank Wear Relationship in Steel Turning

y DEPTH OF CUT

Depth of cut is determined according to the required stock removal, shape of work material, power and rigidity of the machine and tool rigidity.

a Effects of Depth of Cut

1. Changing depth of cut doesn't affect tool life greatly. 2. Small depths of cut result in friction when cutting the hardened layer of a work material. Thus tool life is shortened. 3. When cutting uncut or cast iron surfaces, the depth of Depth of Cut (inch)

Cutting Time Tc=10 min tip of cutting edge which prevents chipping and Depth of Cut and Flank Wear Relationship in Steel Turning abnormal wear.

Depth of Cut

Uncut Surface

P

Roughing of Surface Layer that Includes Uncut Surface