Tool Materials and Carbide Inserts Tool materials high

Tool Materials and Carbide Inserts

Tool materials - high carbon steels - high speed steel - carbide - ceramic - diamond

High carbon tool steels used for hand tools such as files and chisels l sometimes for drilling and turning etc. l

High speed steels l may be used at higher speeds (100 sfpm - in mild steel)

Cemented carbides products of the powder metallurgy process l small particles of tungsten and carbon powders mixed together with a metal of lower melting point (usually cobalt) l

Cemented carbides (Cont. ) mixture is compressed l heated to around 2600 deg F. to complete the sintering process where the cobalt melts and forms a binder or matrix around the tungsten and carbon particles l

Carbide tools most widely used tool materials in the machining industry l insert is normally brazed or clamped to the tool holder l or the entire tool is made of carbide (small mill cutters) l

Tool setup cutting tool should be exactly on center l use heaviest depth of cut possible l never stop the machine while feed is engaged l

l Insert uses

Insert wear and damage

Identification and selection of indexible inserts and tool holders

ANSI Standard identification system l Indexible Inserts

Insert Shape (Position 1)

Clearance Angle (Position 2)

Dimensional Tolerances (Position 3) inscribed circle l thickness l

Chip Breaker and Type (Position 4)

Inscribed Circle Size (Position 5)

Insert Thickness (Position 6)

Tool Nose Radius (Position 7)

ANSI Standard identification system l Tool Holders (Lathe)

Clamping Method (Position 1)

Insert Shape (Position 2)

Holder Style (Position 3)

l holder styles

holder styles l continued l

Rake Angle (Position 4)

Hand of Tool (Position 5) l Right, Neutral (Straight), Left

Shank Size (Positions 6 & 7) l in 16 ths of an inch

Insert I. C. Size (Position 8) l in 1/8 ths of an inch

Qualified Condition (Position 9)