Current, die manufacturer faces the pressure with insufficient order, need seeks additional treatment job. To mould job shops, another can the treatment that the domain of foot of fist of put to good use may be aviation spare parts. A lot of mature techniques that the mould processes also can be used at the cutting treatment of material of difficult treatment aviation. The titanium alloy that machines with the need on plane and military airplane as business, Inconel alloy and component of high temperature alloy increasingly grow in quantity, need uses more advanced cutting processing technique. Come for years, a lot of aviation machined new technology to also win wide application in mould manufacturing industry. It is identical that the control cutting of heat in metal cutting machines temper by dipping in water to be versed in a lot of difficult problem of mould steel process aviation data as hard as cutting forcedly. Among them the control that a main general character problem is heat in metal cutting. A kind of when control heat in metal cutting efficient way is the radial width that reduces cutting. Cutting radial width is to point to be in line by line when cutting, the distance between the central line of every two parallel cutting. Normally, the 2 ％ that cutting radial width should be equal to cutting tool diameter - 10 ％ . The radial width of cutting (step pitch) the accident that decided every tooth participates in cutting time, and it is in enter the next time the cooling time before cutting, also decided to be able to accumulation of how many heat in metal cutting is in in cutting tool and workpiece thereby. Come for years, to create a pattern successfully, tool manufacturer used the method that controls step pitch of cutting tool cutting. Recently, this kind of technology also won application in treatment of aviation spare parts. If cutting step pitch is too big, because tooth participates in cutting time to grow too, and the cooling time before cutting work again is insufficient, heat in metal cutting can accumulate more more. And use lesser cutting step pitch, can make tooth arises to cool continuously effect, control the generation of heat in metal cutting thereby. Cool continuously through using effect will adjust the generation of heat in metal cutting, can use higher main shaft rotate speed to undertake machining, and won't achieve can make the high temperature of invalidation of cutting tool coating. And once reach coating invalidation temperature, the cutting blade of cutting tool can wear away quickly, make cutting force increases, cutting tool and workpiece temperature are elevatory. If used right treatment technology, heat in metal cutting won't build up in workpiece. Cutting tool coating is passed choose correct coating, can be in the security that cutting temperature won't endanger cutting tool below taller treatment condition. For example, the top job temperature of TiCN coating is 400 ℃ ; Compare to it, the top job temperature of AlTiN coating is 800 ℃ . Because AlTiN coating has admirable hear resistance, the coating of first selection cutting tool that accordingly it is material of strong pattern of temper by dipping in water of high speed treatment and material of difficult treatment aviation normally. Use the tall hear resistance of AlTiN coating, can use higher main shaft rotate speed and won't damage cutting tool. A when process aviation alloy and mould data main distinction is, the treatment of most aviation alloy uses pouring and cooling means. Nowadays, in difficult treatment material (the alloy that be like titanium) in treatment, high-pressured refrigeration technique is becoming increasingly popular, improved cutting tool life effectively. Feed and cutting speed use appropriate cutting rate and feed to build up to controlling quantity of heat crucial. Should cut bits when negative charge is bigger, major heat in metal cutting is cut bits is taken away, because this won't be accumulative,be in cutting tool and workpiece. If cut bits negative charge too small, grind with respect to meeting generation or grinding effect, bring about accumulation of quantity of heat thereby. Accordingly, in won't damage the condition of cutting tool or workpiece falls, it is very important to prolonging cutting tool life to collect the negative charge that cut bits. For example, if reasonable every tine cuts bits negative charge,should be 0. 127mm, and the bear cutting bits that uses actually is 0.
0635mm, a work that needs 20 minutes to be able to be machined only originally is about to cost 40 minutes, this is meant, cutting tool cost the time on cutting to increase one times than real need. The design of appearance of geometry of cutting tool of appearance of cutting tool geometry is mixed to control heat in metal cutting lengthen cutting tool life to also producing main effect. Although mould treatment and treatment of aviation spare parts used similar technology, but the cutting tool that both place uses is not identical. These two kinds of cutting tool have similar place possibly on the appearance, but be designed in geometrical appearance and is bigger difference however on hard alloy brand. Mould of treatment process designing machines process designing personnel to will discover, if they turn to aviation spare parts to machine process designing, the likelihood is not a very difficult issue. Treatment process designing decided cutting tool cuts the way of workpiece material, and the cutting force kind that action has at the knife. Accordingly, the crucial essential factor that machining process designing is alloy of steel of mould of high speed cutting, titanium, Inconel alloy and alloy of high temperature aviation. When treatment antrum or sunken antrum, cut workpiece to should use helix to interpolation moves or be gotten beforehand the means of aperture, with reducing the loss of pair of cutting tool heads as far as possible. Machine program should avoid to insert mill directly (insert mill in Z axis direction only) . The value of cutting radial width has discussed in front, but also may appear cutting axial deepness (Z axis direction) too big case. Normally, if use typical mould processing technique, walk along a knife to be able to be used every time 1.
The cutting deepness of diameter of 5 times cutting tool. In temper by dipping in water the treatment on strong pattern steel and material of difficult treatment aviation opens slot is a kind of quite difficult cutting task. Nevertheless, use process designing of cycloidal knife course, OK and fast, relaxed, reliable ground realizes mill chamfer treatment. Cycloidal knife course is used at sunken antrum of mill chamfer and milling, can use a diameter to need groove for place normally wide 50 ％ - the cutting tool of 62 ％ will undertake machining. For example, if need treatment,width is 25.
The chamfer of 4mm, can use a diameter for 12.
7 - 15.
Of 9mm establish milling cutter. Choose cutting tool according to this one scale, OK utmost ground reduces accumulation of quantity of heat and exterior contact. OK still according to before the radial width that narrates a specification to choose cutting (the 2 ％ of cutting tool diameter - 5 ％ ) with axial deepness (1 of cutting tool diameter.
5 times) . Most CAD/CAM system offerred cycloidal knife course, but be applied rarely however, even not quite humanness place knows. Brief summary machines a domain in aviation spare parts, seasoned die manufacturer has very large dominant position really. Use technology of high speed cutting to machine die of alloy of difficult treatment aviation and cutting treatment temper by dipping in water to provide a spare parts to have a lot of collective place on craft. Choose speed of appearance of cutting tool geometry, cutting and feed and technology of treatment process designing correctly, meet to machining spare parts of mould spare parts and aviation alloy successfully have main effect. Once all these craft element are applied correctly, treatment will become simple and can forecast. CNC Milling