Establish machining process is similar to the ordinary lathes machining process when using CNC lathe to machining, the CNC lathe is clamp one time to complete all the turning process with continuous automatic machining, so we need pay more attention to choosing the right insert and cutting parameters.
Part 1 The principle of choosing cutting tools for CNC lathe
1. There are lots of different requirements on CNC lathe insert than ordinary lathe insert, such as:
a. High rigidity (especially cbn insert for rough machining), high precision, anti-vibration and little thermal deformation;
b. Have a good inter operability, easily change;
c. Has a long tool life, a stable and cutting performance;
d. It is convenient to adjust the insert size, for saving time of change cutting tools;
e. Should chip breaking for excluding the chip;
f. Serialization, standard, good for program and manage tools.
2. Choose the right insert material:
a.High-speed steel insert;
b.Carbide insert;
c.Diamond insert;
d.Other material insert, such as CBN (Cubic Boron Nitride)insert, ceramic insert, etc.
Classification by the cutting technology: hard turning inserts: cylindrical, inner bore, threading screw, cutting tools, etc.
Part 2 The steps to choose the CNC lathe cutting tools
1.Confirm the CNC cutting tools angle first:
Choose the insert angle according to the work piece shape and machining technology, this step is same as the ordinary cutting tools choosing step.
2. Match the right CNC insert according to the chosen turning tools type:
(1)Choose the insert material according to the work piece material first, you need pay more attention on: as many insert material is universal, such as high-speed steel insert, carbide insert and coated carbide insert are all be well for machining the 45 steel, you need to choose the insert material according to the production rate.
For example, CBN(Cubic Boron Nitride)insert is usually used for turning the HT250 material;BN-S30 grade CBN insert efficiency is 2-5 times than carbide insert when machining the gray casting work piece.
With the development of insert technology, high performance insert material appeared, it can improve both machining efficiency and machining quality.
For example,BN-S30 solid CBN(Cubic Boron Nitride)insert from Halnn, its tool life is 10 times more than Mitsubishi UC5115 grade coated carbide insert when rough machining Cast iron HT250;and the gray cast iron roughness can reach Ra1.6 when finish machining.
(2)Choose the insert tip arc angle and groove according to the process technology require. You can reference catalogue to get the details.
Part 3 The three cutting key points for choosing insert
Three key points of cutting parameter: Cutting depth, feed rate and linear speed. The cut depth was usually confirmed according to the machining margin, the roughing feed rate according to the lathe machine power, finishing feed rate based on surface roughness; the linear speed was confirmed according to the insert material and rotate speed of lathe machining main shaft.
Increase cutting depth is a method which was worth to consider to improving the machining efficiency. When the cutting depth is 10 times than feed rate, the insert durability almost won’t change if increase the cut 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 the high production rate, but also won’t increase the insert cost.
Detail Application case, you can send me email info@halnntools.com or leave message for me Whatsapp:+8615617635382