TEST STUDY OF A NEW TYPE NON-SEAL SLIDING BEARING CONE BIT

The sealing washer of cone bit with sliding bearings worked in bad condition,it is easyto be damaged.Large space is occupied by the washer that reduced the load-bearing capacity and the bit life.Through the analysis about the bearing failure,it is put forward that is should use higher hardness and good temperature stability material in the bearing surface of the non-seal sliding bearing cone bit.The hard to hard model should be used in the bearing frictional part.Through the machanics and friction ability analysis about the WC-Co materal,the brittleness problem has been solved with a new bearing structure and developped a new type cone bit with non-seal hard metal slippage bearing.It is shown through the tests the carbide has good wearability and can be used on the sliding surface of non-seal sliding bearings.It has also been proven through the field test that the new type cone bit has good application prospects and is a effective way to develop high speed and slim size sliding bearing cone bit.