Ceramic Vs Carbide Lathe

Ceramic inserts are created in a process very similar to that used for cemented carbide.

Ceramic vs carbide lathe.

Whisker ceramic inserts are for moderate hardness machining at high surface speeds. Inserts used a ceramic. As for hardness tungsten carbide is measured in the vickers scale well beyond the range of the rockwell c scale. 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.

B carbide table 2. Carbide inserts as opposed to ceramic post by pkane thu jul 03 2003 3 24 am we ran approx. 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. 1000sfm at around 004 ipr we used tngn 454 wg300 greenleaf insert with a t land i forget what size it was.

Tungsten carbide is heavier than ceramic when compared to a ring of the same size. 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. In addition applying indexable drills on a lathe provides some distinct advantages over traditional solid hss or carbide twist drills. Hard turning and milling turning is an almost ideal operation for ceramics.

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. You are probably on the low end of speeds for a ceramic insert at 600 sfm. Lathes are a bit smarter but also more complicated. High pressures are also used.

If carbide is around 2 600 vickers hv think of it as roughly. Because ceramics do not bond as easily as other materials much higher temperatures must be used during sintering. In comparison ceramic is quite the opposite and is considered to be very lightweight. 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.

Silicon carbide sic whiskers are often used to provide additional strength in ceramic inserts. 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. Knowledge of when and how to use ceramic grades is important for success. 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.