The titanium alloy material has a tendency to fill the grinding wheel, which brings difficulties to the grinding of titanium alloy rods and TC4 titanium alloys.When grinding, the higher temperature rise generated at the interface between the metal and the grinding wheel causes the grinding surface to produce Higher residual stress, and at the same time, the surface finish is not ideal.
The following methods can basically solve these difficulties:
- Select the appropriate grinding wheel, such as silicon carbide grinding wheel, the sand size is medium (60 ~ 80), the hardness is medium (J ~ M), the surface speed is 700 ~ 1200m / min, alumina (aluminum oxide powder or corundum) The grinding wheel should be used at a lower speed, for example 550 ~ 600min. Also requires medium granularity.
- The use of lower wheel speed and feed speed; due to the low wheel speed, less sparks are generated.
- Cooling with buffer or cutting fluid coolant, and using ceramic binder and chlorinated or vulcanized cutting oil, you can get good results. No matter what type of coolant is used, it must be well filtered to eliminate the “fish tail” stains caused by the recycling of titanium particles.
- Titan Mars may ignite when encountering oil mist, but completely immersing the workpiece with oil can reduce this danger. The antirust type ammonium nitrite aqueous solution can completely eliminate the risk of fire.
But even the best grinding conditions will reduce the fatigue performance of the workpiece.