B10-WHL_EU-EN

BORING | Inserts Boring Insert Wear PaƩerns

A

Comb Cracks

Built-up Edge

PotenƟal Problem • Machined material adheres to the cuƫng edge of insert. • When it breaks, the edge becomes briƩle and cracks. • This can negaƟvely affect machined surface. Possible SoluƟon • Increase temperature by increasing speed or feed. • Use an insert with higher lubricity coaƟng. • Choose a freer cuƫng insert geometry. PotenƟal Problem • Caused by fricƟon between the insert and machined material. • It cannot be fully eliminated, but it can be reduced. Possible SoluƟon • Use a more wear-resistant grade. • Reduce cuƫng speed. • Use coolant or increase coolant flow to the cuƫng edge. Flank Wear

PotenƟal Problem • Caused by high stress on the cuƫng edge during interrupted cuts.

B

Possible SoluƟon • Switch off coolant or increase coolant flow to obtain an even temperature level. • Reduce cuƫng speed. • Use tougher insert grade.

C

D

PlasƟc DeformaƟon

PotenƟal Problem • Caused by high thermal stress on the cuƫng edge from excessive feed rate and cuƫng speed.

E

Possible SoluƟon • Use a more wear-resistant grade. • Reduce cuƫng speed. • Reduce feed rate. • Use coolant or increase coolant flow to the cuƫng edge. Chipping of Cuƫng Edge (Out of Cut) PotenƟal Problem • Caused by poor chip control. • Can damage the porƟon of the cuƫng edge that might not be engaged in the cut. Possible SoluƟon • Change feed rate to gain chip control. • Select a tool with a different approach angle. • Use an insert with a different geometry. • Use a tougher grade of carbide.

F

Cratering

G

PotenƟal Problem • Appears when the geometry is too neutral or material is too hard for the substrate.

H

Possible SoluƟon • Use a more wear-resistant grade. • Reduce cuƫng speed or feed. • Use coolant or increase coolant flow to the cuƫng edge. Notch Wear PotenƟal Problem • Occurs when cuƫng edge of insert comes in contact with surface of machined material. • Caused by hardening of surface layer of material and burrs. • OŌen appears on stainless austeniƟc steels and other high-temperature alloy steels. Possible SoluƟon • Use a more wear-resistant grade (Al 2 O 3 ). • Select a tool with a smaller approach angle. • Vary the radial depth of cut. • Use coolant or increase coolant flow to the cuƫng edge.

I

Insert Fracture

J

PotenƟal Problem • Caused by workpiece material, grade, condiƟon, the rigidity of the machine-tool workpiece, extent of wear, and cuƫng condiƟons.

K

Possible SoluƟon • Use a tougher grade of carbide. • Reduce the feed and depth of cut.

L

• Use an insert with a stronger chip breaker. • Use an insert with a bigger corner radius.

M

INDEX

B10-H: 42

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