The Development Of Brazed CBN Wheel With Addition Of Rare-earth In Brazing Alloy

There are several distinguished properties in Cubic boron nitride (CBN) abrasive, such as extremely high hardness, superior thermal stability, large chemical inertia and excellent thermal conductivity. CBN wheels have been utilized widely and good effects were found in grinding difficult-to-machine materials like titanium alloy. The most extensive and steadily used in the brazing of CBN grain was Ag-Cu-Ti alloy, it's working temperature can not exceed 600℃though good performance in brazing joint can be gained in room temperature. Rare earth element can improve the activity of the exterior in grain while the percentage of Ti in the brazing alloy at a lower level, these caused enough interface chemical reaction and moisten effect between brazing alloy and grain. Furthermore, the addition of certain RE (Rare earth) with certain percentage can keep the sharpness of the abrasive. These provided excellent grinding performance in titanium alloy grinding using RE additional brazed CBN wheel.The main contents in this paper are as follows:(1) Explore the brazing process which can provide substance jointing among RE additional brazed alloy,CBN abrasive and steel, discovered that 0.5 wt% La can get the most favorite brazing quality;(2) Grinding force comparable experiments were measured using two integral type mono-layer brazed CBN. Evaluate the grinding ability of the two wheels by tracing the surface quality under certain material removal;(3) Design and fabricate the interrupted type mono-layer brazed CBN wheel according to the requirements of titanium alloy component with complex contour, to exert the potential of this new type tool by the application in the profile grinding of titanium alloy.