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Since a period of time, the titanium metal with its excellent strength to weight ratio, become one of the preferred materials for aerospace industry. But it is this achievement aircraft designers dream attributes, to make it into a metal processing. However, with the launch of the CoroMill690 Sandvik Coromant, now have to bear the responsibility of special long edge of blade milling cutter.
Aerospace industry on titanium metal could be favored by further. In Boeing 787 dreams ( Dreamliner ) and the most advanced aircraft, the dosage of titanium has been compared to older models of increased exponentially, and in the future, titanium metal will account for 15% of the weight of the aircraft.
Ti-5553 is a new titanium alloy, its properties are even more outstanding, in the aerospace industry is becoming more and more popular, and is to replace the old strong material Ti6Al4V. Ti-5553 has excellent strength and high fracture toughness, is especially suitable for manufacturing must be under tremendous stress components, such as structural components and landing gear.
Titanium metal faces general challenges and Ti-5553 specific challenges (it even more difficult to machining ) is: for each procedure are established according to some general rules, meticulous planning and tool selection, these rules are : defining the cutting speed, excellent processing required high feed rate, the use of cooling liquid, to maintain a good chip removal rate, use a sharp tool and appears in the first sign of wear, replace, as well as the tool and the workpiece in the moving contact is avoided in the process of interrupting the feed.
Based on the above considerations, Sandvik Coromant designed a new type of cutter CoroMill690, specifically for high profile milling titanium parts.
The main characteristics of CoroMill690 is one of the new cone blade position, so it can withstand axial cutting force, while the axial cutting force is currently on the market other long blade concept weakness. The result is a reduction in the moving blade, thereby improving process safety, improve the feed, and prolongs the life of cutter body, because it is to prevent the bottom row of fault. The four cutting edge novel design to process the high production efficiency and economic benefit.
CoroMill690 is another feature of the optimized chip groove. This feature helps smooth chip removal, reduce the chip, thereby improving process safety, and improve the cutting parameters.
Because of its resistance to heat, cooling in the process is crucial, cooling is designed so that the cutting edge and the cutter surface does not overheat. CoroMill690 uses end cooling liquid, such as party, shoulder milling and face milling cavity, cavity or the groove, can achieve the best effect of removing chips.
Machining of titanium metal, chip very easily stick blade, causing the next round cutter rotating again cutting chip, tends to cause edge line tipping. Each kind of CoroMill690 blade cavity has the respective cooling hole / liquid injection, used to solve this problem, and to strengthen the constant blade performance.
Another clever solution is screw type cooling hole. There are many long blade cutter blade. For each hole exerts a cooling liquid with very high pumping volume and pressure. But CoroMill690 is different, it can according to need, no need to plug holes, thereby minimizing the need to increase the liquid flow hole.
In short, the introduction of a new type of CoroMill690 cutter to aerospace industry manufacturers to bring many benefits, all these factors together, can promote the process of safety, so that the cutter has a longer and predictable life. Coupled to the titanium alloy processing requirements of the exquisite understanding, the special tool solutions for increasing the use of titanium metal support, especially the Ti-5553 aerospace industry is important material.
Conclusion:
With the increasing of air transportation, low cost aviation passenger and cargo demand is also rising, this trend is expected to continue. At the same time, the consciousness of environmental protection have also been increasing, thus the company put forward to reduce pollution emissions requirements. Helps to reduce the weight of the aircraft titanium metal use has increased significantly. New titanium alloy Ti-5553 has more excellent properties, but also high processing difficulty. Sandvik Coromant has developed a special titanium mill CoroMill690, so as to solve many of the problems inherent in titanium processing.
Case analysis: processing Ti-5553 savings
For Ti-5553 titanium alloy manufacturing parts of the structure, the implementation of 2D profiling milling is a difficulty. The process of using CoroMill690. This is a Capto interface with Coromant ( model 8 ) long edge of blade milling cutter, milling cutter diameter of 84 mm, length 63 mm. Process of cutting conditions is: cutting speed of 22 meters per minute, each tooth is 0.13 mm, the radial cutting depth of 6 to 18 mm, the axial depth of cut is 20 ~ 40 mm. The blade is a grade GC1030. Using this solution, manufacturer of each leaf can be blade production time increased by 50%. At the same time, the CoroMill690 tool design can reduce noise and vibration.