Halnn Superhard Materials Co.,Ltd
Analyze the CBN inserts cracking phenomenon Cutting tools abnormal cracking is the customers most boring trouble, that will increase the machining cost, work piece scrap or rework, low the machining efficiency and other problem. Especially the CBN insert is a little expensive, cracking phenomenon will case lots of waste, so it is so important to choose the right CBN inserts. Halnn Superhard material company summarize some chipping reason as following: 1.The CBN inserts own performance, the overall sintering between the major CBN granule and suited binder will exit a high tensile strength, this is commonly CBN inserts advantages during roughing. Except the high purity require during producing the 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 important reason for different CBN inserts quality in the market. In addition, the synthesis process directly decide the shape and size of the polycrystalline grain when process the CBN inserts. 2.The selection of the CBN inserts, the cut depth of soldering compound CBN inserts should control within 0.3mm or even more less to ensure using safety, any manufacturers soldering compound CBN inserts can not make sure there is no chipping when facing interrupted machining, this condition must choose the solid CBN insert. 3.The selection of the CBN inserts type, the impact resistances comparision with the same grade CBN insert: round insert, commonly 25°,45°,75°,83°,90°(the inserts angle after install ),and the of width and angle of the inserts chamfering also effect the cutting tools strength. 4.Cutting parameter influence, reduce the feed rate is the most reliable way for the cutting force; we need turn down the revolving speed when interrupted turning or machine the long and thin shaft. 5.The CNC lathe reason, the machinery overall system rigidity must be high, for avoiding shaking during machining; we also need avoid the jammed when roughing. 6.The extend length of the cutter arbor, overlong length has the shaking and chipping risk, the extend length need within the arbor size. 7.The cutter arbors quality reason, the good quality cutter bar has a excellent heat-conducting property, a high machine rigidity, seismic performance; although the price is a little higher, but the machining total cost will not happen a big change, and will reduce the cutters unnecessary waste. 8.The cutting fluid: Cooling liquid can be used when roughing the gray cast iron or other materials, but the thermal stress will make the CBN inserts cracking risk. 9.In some case, The cutter own impact resistance and heat-conducting property are not contradictory. For example, YG series turning tools has a good impact resistance, but there are a www.halnntools.com