Efficient cutting starts the application on machine manufacturing industry in aviation

Time:2023-06-21 12:30:55
Click:64
source:PURELIFE CNC Machining

One, theory of cutting of foreword high speed is 20 centuries the concept of the cutting of concerned high speed that 30 time put forward first by German Dr. Carl Salomon. Its think heat in metal cutting just is inside limits of traditional cutting speed namely in a word theoretically is with cutting speed is become drab add function to concern. And after breaking through certain limit when cutting speed, cutting temperature increases along with the addition of cutting speed no longer, can reduce along with the addition of cutting speed instead, become inside the limits of higher rate with cutting speed namely drab decrease function. This theory passes research of a few years and application, already made the trend that contemporary and efficient cutting machines and development way gradually. 80 time end and begin to apply at the beginning of 90 time and develop to apply extensively at manufacturing industry of aerospace, car, mould to machine quickly aluminous, magnesium alloy, steel, cast-iron reach its alloy, super alloy and carbon fiber increase plastic wait for composite material, machine among them cast-iron with aluminium alloy most general. In metallic cutting process, choose very high cutting rate, not be the only method that improves treatment efficiency certainly. A lot of program of this kind of cutting is subsistent problems, among them the biggest question is: Main purpose is the high speed cutting that produces efficiency with Yudigaosheng, did not improve manufacturing efficiency actually. It asks the machine tool issues cutting in high rotate speed, but will raise cutting rate to increase rotate speed of machine tool main shaft, often reduce cutting deepness in order to reduce feed ﹑ to be cost. Excision rate is very so low, manufacturing efficiency is not tall. Of course, the main shaft power of this opportunity bed is OK very small. The finish machining that this reach the part with exterior integrality very high demand to surface roughness of those dimension precision, surface (requirement spare parts is changeless form, the cutting power that produces in cutting consequently wants small the treatment) that waits for a series of extremely slashing conditions to fall, it is very advantageous truly. The quality that the efficient treatment on real significance should be spare parts of the treatment in cutting treatment rises jointly with what manufacture efficiency. 2, the component stuff of the characteristic of aviation motor manufacturing industry and engine of current situation aviation is very old one part is alloy of Ni radical high temperature, belong to the processes very hard data in difficult treatment material, and the treatment of major part is machined for turning, its are less than relative to cutting function 0.

The opposite processability of steel of 45# of 2(normalizing condition can be 1) . Its are difficult the main characteristic of treatment is: Cutting muscularity. The cutting force of high temperature alloy is the double above of medium carbon steel. Cutting temperature is high. When alloy of cutting high temperature, because be out of shape,fight muscularity, knife face and cut the attrition between bits and workpiece acuteness, unit cutting power is great, the power that consume is much. Cutting tool wears away acuteness. Its reason remains cutting temperature tall, material hardness is tall, felt wears away serious, easy generation accumulates bits tumour and arris thorn. As a result of a lot of reason of above, at present the current situation of alloy of domestic treatment high temperature is cutting speed low, control generally in 35m/min, feed is low, for 0.

05-0.

2mm/r, cause cutting to machine efficiency extremely low, and cutting tool wears away serious still. How to improve treatment efficiency, in the treatment that introduces efficient cutting aviation motor industry, it is the problem that be being discussed all the time and a lot of people study for long. 3, the structure of research cutting tool of efficient cutting reachs high temperature alloy the choice of material is in the treatment of high temperature alloy is very important. Bit material asks to have very tall fight oxidisability, red rigid, wearability; Choose pure W-Go alloy, the YD101(YT that is like Inc. of cutting tool of cutting of diamond of individual plant continent kind purer W-Go alloy differs hard alloy bending strength and thermal conductivity, diffuse each other to avoid the Ti in the Ti in hard alloy material and material of high temperature alloy at the same time) , YBG102 coating ply is very thin, only 0.

002 ～ 0.

004mm, fight felt ability strong, those who fit stuff of high temperature alloy is efficient treatment. Additional, by cutting the experiment can be seen, with same kind of chamfer Jigaowengejinbi machines bit treatment nickel the cutting force of 45 ﹟ steel should be gotten greatly much. In the meantime, we still can see, when machining alloy of nickel radical high temperature, use different bit chamfer model can gain different cutting strength. Chamfer of DNEG150608-NF /YBG102 razor blade very important in whole cutting process, involve bits, guide those who discharge bits is bits, smooth, still involve overcome treatment sclerosis effectively, reduce cutting resistance as far as possible, and control of all kinds tatty to expand conciously, prolong cutting tool life, improve workpiece surface quality, and raise cutting speed to wait. Accordingly, the bit chamfer that asks to machine high temperature alloy have solid and sharp bit point of a knife, smooth before knife face, there still must be reasonable blade inclination in finish machining product; Still need to choose reasonable airframe capable person to pledge with coating, still have reasonable finishing and point processing. Establishment of form a complete set should choose power the machine tool with big, good tigidity, use the cutting liquid with cooling good effect, recommend choose extremely press cutting fluid, do not contain sulfur. In metallic cutting process, choose very high cutting rate, not be the only method that improves treatment efficiency certainly. Especially when the cutting of high temperature alloy, too rely on to raise cutting rate, will improve treatment efficiency, it is not actual apparently, it can increase cutting tool to spend cost greatly already, cannot complete machine program at all even at the same time. Do not ignore the treatment program that increases feed below medium cutting speed right now, this is the conclusion that reachs by many cutting practice. High temperature alloy all is formed in very wide cutting speed range dentate cut bits, follow cutting rate rise, toothed turn degree raise, till form separate unit,cut bits. V=35m/min, f=0.

The V=60m/min of 15 that cut bits, f=0.

The V=80m/min of 15 that cut bits, f=0.

The V=120m/min of 15 that cut bits, f=0.

The V=180m/min of 15 that cut bits, f=0.

The V=250m/min of 15 that cut bits, f=0.

The unit of 15 that because bits position is cut when high speed cutting,cuts bits is changed, the treatment of alloy of Ni radical high temperature is in difficult treatment material completely likely high speed of the implementation below existing cutting speed is changed. The cutting condition all through the ages of difficult treatment material set must be compared low, as cutting tool function rise, the occurrence of machine tool of CNC of high speed high accuracy, and of means of high speed cutting introduce etc, current, the cutting of difficult treatment material already entered the period that life of long life of high speed treatment, cutting tool spends. Now, use small cut deep in order to reduce negative charge of blade of cutting tool cutting, can raise the treatment kind of cutting speed and feed speed thereby, already made the optimal way of material of cutting difficult treatment. Of course, the choice gets used to difficult treatment material the cutting tool material of peculiar function and figure of cutting tool geometry are very important also, and the maximize that stress begs contrail of cutting tool cutting. In farther cutting experiment, we send rate of same now cutting (the state cutting bits that different feed leaves V=80m/min) : F=0.

15mm/r F=0.

25mm/r F=0.

4mm/r is visible, below same cutting speed, as the accretion of feed, the trend that cuts bits form to cut bits into separate unit is clearer. So, why planting below cutting speed, cutting treatment can achieve optimal efficiency, and can the cost of cutting tool fall lowest? The cutting tool that we see fall in different cutting speed again wears away state: Experimental data: Homebred close high 4133, cutting function more under import data Incon718. 80m/min cutting rate falls handling time 6min, of face of bit around knife wear away the handling time below speed of condition 120m/min cutting 25 ″ of 1 ′ , of face of bit around knife wear away condition is informed by much cutting experimentation, in the turning treatment of high temperature alloy, when cutting speed achieves 80-100m/min, the function of YBG102 coating razor blade can satisfy treatment completely to ask, make cutting tool life and workpiece condition are achieved optimal. When cutting speed is more than 120m/min, because cutting tool has worn away fast, had lost the sense of treatment. Want to improve manufacturing efficiency, must raise excision rate. By cutting principle knowable, the excision rate in metallic cutting and feed of cutting speed ﹑ and cutting deepness are having close relationship. Rate of visible excision of excision rate V=1000*ap*fn*v (mm3/min) and feed of cutting speed ﹑ and cutting deepness are existing simple linear increases by degrees relation, but the excision rate with simple high pursuit, in processing application actually, do not hold water, because be below current cutting tool condition, cannot use feed of exorbitant cutting speed ﹑ and cutting deepness. Accordingly, the efficient treatment on real significance must be high excision rate and the optimal union that tall excision measures. Excision measures Q =1000*ap*fn*v*T (mm3)=V*T (mm3)T, handling time, namely cutting tool life. The experiment makes clear excision between rate and excision quantity, the contain that exists as follows figures a relationship: Much cutting experimentation makes clear, homebred YBG102 is in of high temperature alloy when turning is machined, quantity of the biggest excision is 40000-45000mm3/ blade, can need according to what machine actually from this, according to above concerns, feed of ﹑ of speed of reasonable arrangement cutting and cutting deepness. Among them feed takes a value to be in 0.

1-0.

4mm/r, cutting speed can amount to 80-100m/min. 4, the treatment of alloy of conclusion high temperature can realize high speed cutting completely, but machine function specially as a result of high temperature alloy, achieve when turning speed > when 120m/min, lost the real sense of treatment. 2, the optimal union that the efficient treatment of high temperature alloy must be high excision rate and high excision volume. CNC Milling