Ceramic cold hardening phenomenon is serious: due to the high chemical activity of titanium, it is easy to absorb oxygen and nitrogen in the air to form a hard and brittle skin at high cutting temperatures; at the same time, plastic deformation during cutting will also cause surface hardening. Chilling phenomenon not only reduces White Zirconia Ceramic the fatigue strength of parts, but also aggravates tool wear, which is a very important feature when cutting titanium alloys.
Ceramic tools are easy to wear: After the blank is processed by stamping, forging, hot rolling and other methods, it will form a hard and brittle uneven skin, which is easy to cause chipping, making the removal of the hard skin the most difficult process in titanium alloy processing. In addition, due to the strong chemical affinity of titanium alloy to the tool material, the tool is prone to bond wear under the conditions of high cutting temperature and high cutting force per unit area. When turning titanium alloy, sometimes the wear of the rake face is even more serious than that of the flank; when the feed rate f<0.1 mm/r, the wear mainly occurs on the flank; when f>0.2 mm/r, the front The tool face will be worn; when using carbide tools for fine turning and semi-finishing, the wear of the White Zirconia Ceramic flank face should be less than 0.4 mm for VBmax.
In the milling process, due to the low thermal conductivity of the titanium alloy material and the extremely short contact length between the chips and the rake face, the heat generated during cutting is not easily transmitted, and it is concentrated in a small range near the cutting deformation zone and the cutting edge. Extremely high cutting temperature will be generated at the cutting edge during machining, which will greatly shorten the tool life. For the titanium alloy Ti6Al4V, the cutting temperature is a key factor that affects the life of the tool, White Zirconia Ceramic not the size of the cutting force, under the conditions of tool strength and machine power permitting.
Are ceramic materials wear-resistant?
2021 09/13