# Aluminium alloy accumulates the generation of bits tumour in turning process

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153mm/r, quantity of back penetration of a cutting tool is 2.

5mm. In experiment process, assured the consistency of cutting tool material and cutting tool angle basically. Cutting temperature is to point to cutting area temperature, but because measure difficulty, the measurement that a cut experiments when so this experiment machines an end with each knife temperature is cutting temperature. Although with actual temperature (cutting instant temperature is met sometimes tower above 30 ～ 50 ℃ , and have the influencing factor such as aluminium alloy oxidation) somewhat difference, but a kind of rule that changes as temperature, should be desirable. In the experiment, the instrument that measures temperature uses a kind to be able to adjust according to different material the SL-305 of emissive rate infrared ray measures Wen Yi, span for - 500 ℃ of 40 ～ . To avoid to transmit the influence of rate, the different data that provides according to manufacturer launched rate correspondence watch to have logical choice, emissive rate is choice aluminium alloy 0.

3. Environmental temperature is 21.

5 ℃ . In the meantime, to check higher rate cutting when, whether does the tumour that accumulate bits produce the situation that reachs generation, undertake the cutting below the condition such as rotate speed 560r /min experiments. 2 tests result and analysis accumulate the relation between speed of bulk of bits tumour and cutting temperature, treatment, cutting to because cutting diameter reduces 2 × with every cutting,accumulate the relation between bits tumour and cutting temperature 2.

The attenuate of geometric ratio exemple of 5mm=5mm, and it is certain that rotate speed is, cutting speed is so degressive. Although carry penetration of a cutting tool on the back,at the same time the quantity is 2.

5mm, but decrease successively as a result of cutting diameter, cutting area is so degressive, plus every time cutting treatment length also is reduced somewhat subsequently, so time of cutting bulk, cutting also drop off. Because of this cutting tool wear away, calorific reach heat in metal cutting to will differ somewhat. These will differ level land is formed to accumulating the size of bits tumour to reach affect somewhat. Graph the relation between size of the 2 lump that accumulate bits and cutting temperature pursues the relation between size of the 3 lump that accumulate bits and cutting speed pursues the concern plan between size of the 4 lump that accumulate bits and cutting bulk is shown 2 times to accumulate the relation between bits lump size and cutting temperature, the relation between the volume of the tumour that accumulate bits that showed LY12, 7009A and stuff of 3 kinds of 6061 aluminium alloy and cutting temperature. The height of the tumour that accumulate bits on face of the knife before the size of the lump that accumulate bits here is. Visible, although graph line is a little fluctuant, but the relation curve that divides 7009A has outside dropping, size of the lump that accumulate bits as cutting temperature elevatory increase somewhat. LY12 is more than on 6061 whole, sticky knife is relatively serious, form the tumour that accumulate bits easily. And 7009A, the tumour that accumulate bits increases as temperature show reduce a current, because its are outspread,be rate is older, bits is cut to break bits difficulty in cutting process, bits is cut to had been twined when diametical Ø30 fall off somewhat at causing the tumor that accumulate bits badly be caused by. The tumour that accumulate bits and cutting speed, relation that processes volume pursues 3, the graph shows the concern that is size of the lump that accumulate bits and cutting speed and cutting bulk respectively 4 times. Although the circumstance of 3 kinds of material has each,differ, but be in on the whole, the size of tumour of bits of every kinds of material accumulating all increases as the addition of cutting speed and bulk, reduce as the addition of cutting speed and bulk again next, intermediate part cost is higher. This kind of phenomenon and afore-mentioned cutting area temperature namely heat in metal cutting is concerned, when cutting rate is high, because platoon bit is good, cut bits to take away a large number of heat in metal cutting; When cutting rate is low, calorific quantity is opposite less, tumour of reason accumulating bits slants small. The relationship of size of the lump that accumulate bits and cutting bulk also presents similar case, the reason is same, because be in this cutting experiment,this is, diameter of the cutting when cutting volume is large is big also, cutting rate is high also, conversely low. Aluminium alloy the LY12 of prep above of size of the lump that accumulate bits of 6061, inside very big range the tumour that accumulate bits indicates greater numerical value. This is the cause as a result of 6061 extremely rich stickiness. Stickiness is big, cutting treatment attrition is big, temperature of the cutting in machining a process so all the time very tall, and be reduced hard, because this accumulates bits tumour big. The situation of 7009A is special, the tumour that accumulate bits is big, but have fall off phenomenon. Because cut bits to twine serious be caused by,this is. Additional, use 7009A to undertake rotate speed falls for 560r/min condition relatively high speed cutting experiments, the result discovers here the circumstance falls, the tumour that accumulate bits arises not easily. Because,this is, arrive high when rotate speed when certain level above, although cutting diameter decrescent, cutting speed still holds higher numerical value, platoon bits keeps good, cutting area temperature lifts not easily, the cohere that cuts bits gets assuasive reason. Get verdict by afore-mentioned analysises: In rotate speed penetration of a cutting tool of certain, back measures particular case to fall, bulk of the diameter of the main reason that affects size of the lump that accumulate bits and workpiece, treatment is concerned, concern with cutting linear velocity, mainer is with cutting temperature is concerned, as the addition of cutting temperature, size of the lump that accumulate bits increases, and increase the tumour that accumulate bits as cutting speed criterion by small greaten again by big decrescent, should increase peak value hind to be reduced as the addition of cutting speed again namely. What the cutting speed of correspondence of place of its peak value follows stuff is different and different. Be worth certainly when cutting speed prep above namely when, the tumour that accumulate bits will arise not easily, because when cutting the heat in metal cutting when rate is higher is cut for the most part,this is bits is taken away, accelerate as a result of speed at the same time, face of the knife before cutting tool stops with the bottom that cut bits the reason with the attrition less power between the layer. And when low speed, it is certain that as a result of the back penetration of a cutting tool is measured and not quite, the metallic cutting bulk inside unit time is little, calorific quantity is so little also, accordingly, generation of the tumour that accumulate bits is relatively young also. Although material of a few kinds of material differs somewhat character, semifinished product diameter also differs somewhat, but in light of the rule from them, more consistent still. The 6 7009A of graph of the tumour that accumulate bits when the C)7079A-Ø15 of the tumour that accumulate bits when the 5 LY12 of graph of the tumour that accumulate bits when the C)LY12-Ø15 of the tumour that accumulate bits when A)LY12-Ø40 cuts bits B)LY12-Ø15 accumulates A)7009A-Ø50 of bits tumour graph cuts bits B)7009A-Ø15 accumulates bits tumour graph to machine the tumour accumulating bits in the process to pursue 5, pursue, the state of the tumour that accumulate bits that includes to machine level individually among them and each machine the state cutting bits of level. The condition of the tumor that accumulate bits when 5b of graph 5a, graph is aluminium alloy LY12 to be Ø40 and Ø15 in treatment diameter respectively pursues. From the graph 5 visible, when workpiece diameter is lesser, the tumour that accumulate bits is more apparent. According to afore-mentioned explanations, accumulating bits lump size to differ somewhat is the different be caused by as a result of cutting bulk and cutting temperature, experiment when treatment when a diameter is big, criterion cutting rate is high, platoon bits is opposite better, the tumour that accumulate bits is formed relatively slow, conversely the diameter is lesser, cutting rate is minor, platoon bits is poorer, cutting area temperature is higher, the tumour that accumulate bits is formed more easily. From the graph 6 can see apparently, workpiece diameter hour, the tumour that accumulate bits is apparent bigger. In fact, as diametical decrescent, cut bits by compressed become curly, cut bits to break bits difficulty from beginning to end, bring about cutting area temperature to rise, form the tumour that accumulate bits easily, as outspread as its rate concerns this result. The graph is shown 7 times is aluminium alloy the graph of the tumour that accumulate bits of 6061. Graph 7 can see, the tumour that accumulate bits contains a bit tail, showed the true course of overlay of cohere of the tumour that accumulate bits, state. No matter the diameter is big small still, the tumour that accumulate bits is formed. 3 epilogue this second experiment basically is to pass pair of aluminium alloy material to undertake cutting is machined, understanding accumulates the course that bits tumour produces and influencing factor; Pass the test that relapses for many times, obtained a few experimental data. Omnibus above content, reach the conclusion of this second experiment is as follows. A)6061-Ø60 accumulates bits tumour B)6061-Ø45 to accumulate bits tumour A)6061-Ø15 to accumulate 7 6061 of bits tumour graph to accumulate bits tumour graph to accumulate bits lump size and cutting area temperature to become direct ratio. With cutting steel similar, when cutting aluminium alloy, rotate speed produces the tumor that accumulate bits more not easily higher, and extremely easy below medium speed circumstance generation accumulates bits tumour, the generation that accumulates bits tumour namely and rotate speed are concerned. Because quantity of heat of generation of low rotate speed is little,this is, and high rotate speed takes away quantity of heat through cutting bits much, temperature of area of medium speed cutting is only so easy elevatory, accumulate bits tumour easy generation. The on any account that defines rotate speed and every kinds of material is concerned. The size of the tumour that accumulate bits and treatment bulk are concerned. Above conclusion basically with before the knowledge that consider or introduces in schoolbook is consistent. Additional, the generation of the tumour that accumulate bits and attrition are concerned, and the attrition force of material follows stuff each are not identical, be like aluminium alloy 7009A, its outspread rate is 8% , 2% of prep above LY12, and intensity and hardness under LY12, tenacity is tall, the quantity of heat that produces as a result of attrition when cutting is machined is more, tumour of reason accumulating bits is big also. Reach thereby, LY12 is relatively other material of two kinds of aluminium alloy, the tumour accumulating bits of the generation below similar requirement is lesser, cutting performance is better. CNC Milling CNC Machining