Three cutting factors and machining efficiency of CBN inserts

As we all know,Improve three cutting elements(linear speed,cutting depth,feed rate) is the most simple,direct method to enhance machining efficiency.But the method usually was limited by the lathe machine conditions,so the best way is to choose the suitable insert material.

Confirmed rules of the three cutting elements:cutting depth,feed rate and linear speed.The cutting depth was usually confirmed based on machining allowance,rough machining feed rate confirmed according to the lathe machine power,finish turning feed rate confirmed based on the surface roughness;linear speed confirmed by the insert material and lathe machines main shaft rotating speed.

Add cutting depth is a method which was worth to consider to improve the machining efficiency.The experiment shows that when cutting depth is 10 times of feed rate,the insert durability almost won’t change if increase the cutting depth continuous.While Change the cutting speed,the insert durability will also change with two times;the insert durability will also change with the feed rate change.So increase the cutting depth can not only realize a high production rate,but also won’t increase the insert cost.

People thought CBN(Cubic Boron Nitride) insert just can finish turning with high cutting speed.Actually CBN insert also can be used in roughing industry,such as following case:

1.Machining Gray cast iron

BN-S30 grade CBN inserts won’t crack when machining gray cast iron with sand,white.The cut depth is 2-3.5mm,its lifetime is 15 times longer than carbide insert of one Japan brand,efficiency improved 1 time.

2.High manganese steel,High-chromium cast iron,chilled cast iron and other difficult to machining castings.

Casting surface has some sand,pore.Chipping will happened easily with carbide insert ,caused insert serious loss,high machining cost and reduce the machining efficiency.

BN-S20 grade CBN inserts machining this type casting,cutting parameter:

Cutting depth ,ap=2-3.5mm ;feed rate=0.25mm/r;linear speed Vc=85m/min. Insert durability:3 hours per corner/cutting edge

With the research on CBN inserts,this cutting tools was used from the previous high-speed finish turning to interrupted turning,it also can rough machining,semi-finishing,also can used in the common lathe machine;has a more economical using cost.

More information,http://www.halnntools.com/,or contact with us halnntools@gmail.com,whatsapp:+8615036165377,skype:cbn_inserts_angels