Ceramic Vs Carbide Lathe

Carbide inserts as opposed to ceramic post by pkane thu jul 03 2003 3 24 am we ran approx.

Ceramic vs carbide lathe.

Hard turning and milling turning is an almost ideal operation for ceramics. High pressures are also used. Knowledge of when and how to use ceramic grades is important for success. The specific properties of each ceramic grade enable high productivity when applied correctly.

Because ceramics do not bond as easily as other materials much higher temperatures must be used during sintering. Ceramic s melting point 3 700 f is higher than sintered carbide which means it can be driven through the cut faster. Silicon carbide sic whiskers are often used to provide additional strength in ceramic inserts. Inserts used a ceramic.

As for hardness tungsten carbide is measured in the vickers scale well beyond the range of the rockwell c scale. 1000sfm at around 004 ipr we used tngn 454 wg300 greenleaf insert with a t land i forget what size it was. If carbide is around 2 600 vickers hv think of it as roughly. Ceramic inserts are created in a process very similar to that used for cemented carbide.

Ceramic grades can be applied in a broad range of applications and materials most often in high speed turning operations but also in grooving and milling operations. Properties of tungsten carbide and ceramic tools properties tungsten carbide ceramic hardness ra 90 95 91 95 compressive strength mpa 4100 5850 2750 4500 transverse rupture strength mpa 1050 2600 345 950 impact strength j 0 34 1 35 0 1. You are probably on the low end of speeds for a ceramic insert at 600 sfm. Ceramic and carbide are very similar in the fact they are both sintered materials just the base and binder are different depending on their application or use.

There are grades of carbide that will do 600 sfm and you re going to negatively affect the life of the insert by machining too slowly. It is common for a programmer to make a hole with an indexable drill and then step off center and cut the hole to a larger diameter which can eliminate the need for a boring bar. So too can carbide and ceramic cutting tools achieve higher speeds regardless of the workpiece material than do ones made of high speed steel hss which is positively turtlelike compared to its harder more wear resistant brethren. B carbide table 2.

In addition applying indexable drills on a lathe provides some distinct advantages over traditional solid hss or carbide twist drills. Whisker ceramic inserts are for moderate hardness machining at high surface speeds. Tungsten carbide is heavier than ceramic when compared to a ring of the same size. In general it is a continuous machining process that allows a single insert to be engaged in the cut for relatively long periods of time.