Analyze CBN inserts cracking phenomenon

Summary

CBN Cutting tools abnormal cracking is what customers most boring,which will increase Processing cost,work piece scrap or reworking,lower the processing efficiency and other problems.Especially CBN insert with high price,cracking phenomenon will cause lots of waste,so it is so important to choose the most suitable CBN inserts.

Halnn superhard material summarized some chipping reasons as following:

1.CBN inserts itself performance

The overall sintering between main CBN granule and suited binder will exit a high tensile strength,which is the advantages of common CBN inserts when rough machining work piece.Except the high purity require when producing CBN inserts,the CBN(cubic boron nitride) micro powder also need deoxidized and other many process,and test its bulk density,this is just the most important reason for different  quality CBN inserts in the market.In addition,the synthesis process directly decide the dimension and size of the poly-crystalline grain when processing CBN inserts.

2.The selection of CBN inserts

The cutting depth of soldering CBN inserts should be controlled within 0.3mm or even less to ensure using safety, any manufacturers compound CBN inserts can not make sure there is no chipping when facing interrupted turning condition,this condition must choose Solid CBN inserts.

3.The selection of the CBN inserts type

The impact resistances comparison with the same grade CBN inserts:round insert,commonly 25°,45°,75°,83°,90°(the inserts angle after install ),and the width and angle of CBN inserts itself negative chamfer also affect the CBN cutting tools strength.

4.Cutting parameter influence

Reduce the feed rate is the most reliable method from the cutting force;we need turn down the revolving speed when interrupted turning or machining both long and thin shaft.

5.CNC lathe reason

The machinery overall system rigidity must be high,In order to avoid shaking during machining;we also need avoid the jammed when rough machining.

6.The extend length of the inserts arbor

If the inserts arbor extend long length,it will have the  risks on shaking and chipping,the extend length need within the arbor size.

7.The inserts arbors quality reason

Good quality inserts arbor has a excellent heat-conducting property, high machine rigidity, seismic performance;although the price is a little higher,but the total processing cost will not have a big change,and it will reduce the inserts unnecessary waste.

8.The cutting fluid

Cooling liquid can be used when rough machining gray cast iron or other materials,but the thermal stress will cause CBN inserts cracking risk.

In some conditions,CBN inserts own impact resistance and heat-conducting property are not contradictory.For example,YG series cutting tools have a good impact resistance,but there are a strong cutting resistance will also make the inserts cracked,this condition will mislead the researchers and customer thinking that the inserts doesn't have a good impact resistance,but the actually reason is the cutting tools was not good wear resistant.

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