Общий каталог Tungaloy 2020 - 2021 - страница 1628

Chipbreakers

Factors affecting chip control

• Of these, feed has the greatest eff ect Vc = 200 m/min

Vc = 100 m/min followed by depth of cut and cutting speed in order listed. (1) Cutting conditions

• Feed is proportionate to the thickness of

1 Feed chips.

• Depth of cut is proportionate to the width of

2 Depth of cut chips. Effective

• There are optimum values (eff ective range) in range

3 Cutting speed feed and depth of cut.

• Cutting speed is in inverse proportion to chip thickness. Eff ective range becomes narrow at high speed. Feed: f (mm/rev)

• These are related to thickness of chips and ease of curling. Mild steel Hard steel

(2) Workpiece material Mild steel chips are thicker than those of 1 Alloy element hard steel. 2 Hardness Hard steel chips are liable to curl more than those of mild steel. 3 Heat treatment

• Chips that do not curl are thin. As an

condition exception, in case of mild steel even if thick, may not curl. Feed: (mm/rev) f

• Side cutting edge angle is relative to chip thickness and width

• In fi nishing, small nose radius, whilst for rough cutting, large nose radius is better.

S.C.E.A: small S.C.E.A: large Nose radius: small Nose radius: large

Feed: f (mm/rev)

• Chipbreaker width is selected

• Chipbreaker depth is to be selected so as to be inversely proportionate to feed.
• Deep at low feed and shallow at high feed. Feed: f (mm/rev)

• Eff ective range is wider with wet cutting.
• Especially at low feed range is liable to Wet cutting

Dry cutting curl. (5) Coolant

Feed: f (mm/rev)

(6) Machine 1 Rigidity 2 Power limit

• The machine has enough power and mechanical strength.
• Select the machine consistent with the size of Workpiece material to be used.