Due to the tendency of titanium alloy materials to fill the grinding wheel, it brings difficulties to the grinding of titanium alloy rods and TC4 titanium alloy. During grinding, a higher temperature rise is generated at the interface between the metal and the grinding wheel, causing the grinding surface to be produced. Higher residual stress, at the same time, the surface finish is not ideal.
The following methods can basically solve these difficulties:
(1) Choose a suitable grinding wheel, such as a silicon carbide grinding wheel, the size of the grit is medium (60~80), the hardness is a 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, such as 550~600min. It also requires medium granularity.
(2) Use lower grinding wheel speed and feed speed; due to low grinding wheel speed, less sparks are generated.
(3) Cool with buffer or cutting fluid coolant, use ceramic bond and chlorinated or sulfided cutting oil to obtain good results. No matter what type of coolant is used, it must be well filtered to eliminate the "fishtail"-like stains caused by the recycling of titanium particles.
(4) Titanium sparks may catch fire when encountering oil mist, but immersing the workpiece with oil can reduce this danger. The rust-proof 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
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