Medical titanium material 6AL-4V ELI is a standard product for making hip joint, bone screw, knee joint, plate bone or organ, denture and surgical equipment. However, cobalt chromium alloy will be used more and more frequently because of its firmness, tighter particle size and cleaner than titanium. The cutting force required for machining titanium alloy is only slightly larger than that for machining steel. However, the metallurgical properties of titanium alloy make it more difficult to machine than steel with proper hardness. Titanium has a titanium work hardening property, which eliminates the consolidated metal (curling) in front of the cutting tool. This helps to increase the shear angle during machining, so that thin chips can be formed and touch the surface of the cutting tool on an appropriate small area. Because of this workability, the feed should not be stopped when the tool and workpiece are in motion. In this way, the large supporting force in the processing, combined with the friction force generated by the chip in the touch area, results in a great increase of heat in the part of the tool area. The heat generated by cutting titanium will not be lost quickly because it is a bad conductor. Therefore, most of the heat is concentrated on the cutting edge and tool surface. The large bearing force and heat form crescent depression near the cutting edge, resulting in rapid tool damage. To make matters worse, titanium alloy has a strong tendency to melt into alloy or revive chemical changes with the products in the tool at the working temperature of the tool. Another trend is that when the chip is bonded to the cutting edge of the tool, the tool appearance will be damaged. When the tool starts to damage, these difficulties will be doubled. Therefore, the tool used for processing titanium and its alloy should be carefully supervised to ensure that the blade is sharp and replaced before blunt. The experience of processing titanium and titanium alloys is that if you see any change during processing, you should change the tool immediately, because the change means that the tool will become blunt. Another reason for sticking to sharp tools is that titanium may cause fire when cutting with damaged or damaged tools. When burning, the metal produces oxygen, so the fire will spontaneously ignite. Therefore, many titanium processing workshops do not report fire, and they are equipped with a rescue system on the machine tool.

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