Aviation industry anew the treatment of spare parts of aluminium alloy of industry of aviation of the benefit in development of cutting cutting tool has very high demand to the knife, cutting tool is in have the demand that high quality still must satisfy to machine while tall sex price is compared. Because knife of integral hard alloy has very sharp cutting,blade is mixed groove, in aluminium alloy finish machining cutting force is small, and have look bits space bits of big, platoon is smooth wait for an advantage, because cutting tool of this whole hard alloy replaced traditional high-speed steel cutting tool gradually. In addition, the stretch model of hard alloy measures 3 times be steel about, this is meant fall in laden and same situation, the deflection of cutting tool of integral hard alloy is only but 1/3 of dislocation cutting tool. It is OK still that integral hard alloy establishs milling cutter blade of make it helix, undertake smoothly be cuttinged mixing be cuttinged so, platoon bits is very smooth also smooth, these conduce to the wave motion that reduces cutting force restraining the oscillatory tendency that brings from this thereby. But the rough machining that system of cutting tool of dislocation razor blade can be aluminium and finish machining bring potential advantage, what using 25 ～ 100mm especially is medium to big diameter cutting tool when. Be used at aluminium alloy treatment but dislocation establishs milling cutter to need not be ground again, have better security, versatility and higher metallic purify rate, have unapproachable property. However, the finish machining below a lot of circumstances cannot reach requires level. But, shanteweikekeleman's CoroMill 790 passes brand-new cutting blade, razor blade, razor blade now and clamp technology can come true this a little bit. What the improvement of CoroMill 790 uses at aluminium alloy to machine in research and development is new-style when establishing milling cutter concept, can use through revising a series of parameter to obtain when dislocation razor blade undertakes radial milling, can break through decisively. Main technical difficult point includes: Smooth cutting action, good cut bits to form, extremely high material purify rate, low power comsumption, very good surface surface roughness and the smallest mark that receive a knife, security that ensures high rotate speed lays cutting tool. When machining aluminium alloy, when the finish machining that measures cutting in Xiaoyu especially, but dislocation blade point appears blunter normally, often can bring about " plow cut " the generation of effect, cutting blade cuts work easily also abruptly, cause cutting force to increase suddenly. Increase suddenly of cutting force bring about make a knife too big and power demand is exorbitant. Afore-mentioned problems become because of the demand of cutting blade more complex, must use when finish machining sharp before horny cutting blade, and to ensure metallic purify is led when rough machining, requirement cutting cutting tool has enough strength. Accordingly, cut considering blade of cutting force, cutting, cut bits to form, stability and bit fixed position and clamp, need a kind of new method to use but dislocation razor blade. The cutting power that produces on cutting blade cuts work when the cutting blade of milling cutting tool when, abruptly bump the vibration that will cause cutting tool. The cutting power that produces basically depends on the ply that cut bits, this ply and feed become certain proportion. The cutting tool vibration that causes at first will change the follow-up ply that cut bits, when change when cutting force subsequently and causing the oscillatory aggravate that processes a system conversely, this ply still can continue possibly to increase. The direction of cutting force and fluctuant extent decided oscillatory trend greatly. Vibration of this kind of second birth also calls flutter, if do not try to restrain, the metabolic extent of cutting force can increase, make the exterior surface roughness after cutting drops thereby, generation receives a knife, cause cutting blade and cutting tool damage even, still can produce adverse effect to machine tool main shaft in addition. For this, what must control cutting power in the begining in cutting is acuteness and fluctuant, restrain oscillatory tendency thereby, this also is the main reason that uses vibration isolation cutting tool. Fall in a lot of circumstances nevertheless, this is through undertaking optimizing to bit structure parameter implementation. Build the model accord with the requirement (can accurate computation and forecast cutting strength) one of main basises that are form of chamfer of development new razor blade. Subsequently, advanced FEM is emulated showed a lot of results, involve blade line, before horn and break bits implement the development of the cutting blade new character on face of the knife after combined-type design and razor blade and optimize. This is based on the oscillatory weaveform that through determining mode parameter computation gives greatly. The element of first flank is well-known, when milling is cast-iron, hind of knife face wear away the oscillatory damp that can form certain level. Hind of knife face wear away area and already machined attrition, draw oscillatory energy, bring about amplitude attenuation thereby. Tell from logic, this effect also should the milling that can be used at restraining other type is oscillatory. The difficulty that this technology place faces is how will design technically reasonably hind knife face wears away belt with face of the knife after deciding. To achieve correct damp effect, its position on bit, angle, width and the range that are used on cutting blade need to comparative accurate, and with bit the other that go up is designed the element also should have correct concern. If this kind of technology application is proper, have amortize effect hind the addition that knife face first flank can restrain cutting tool deflection, command the ply that cut bits and radial cutting force thereby. The secret that Shanteweikekeleman already obtained patent new-style razor blade to design depends on, when bit has the tendency of deviate workpiece, its first flank will begin what form accordingly on recurvate instant and workpiece to already machined curved surface to contact in cutting tool -- during preventing to be being machined thereby of cutting tool amplitude increase. This means this razor blade to have persistent stable effect, this effect also is the one part of cutting action. Design technically advocate hind brief now and then contact is very gentle between horny first flank and workpiece, won't right function of cutting tool cutting, wear away development or burr form generation any influences, its are as a result: The change of radial cutting force is quite little. The key with this successful technique depends on advocate hind horny first flank is opposite at bit geometry the compose dimension with cutting tool diameter is mixed the position. Next, what emulate through having cutting process is finite yuan the analysis will evaluate cutting join forces, cut bits to form and of level of the stress in bit distributing. Diametical element for the influence to radial cutting force, small to tigidity of medium diameter cutting tool bad, happen more easily deflective, and big diameter cutting tool is stabler, they are different also to the requirement of vibration isolation. In addition return discovery, feed rate is not the main factor that affects radial cutting force, between the different feed in cutting tool (normally every tine feed is 0. 25mm and 0.
35mm) , the size of radial cutting force has a few change only. Establish milling cutter to typical diametical 25mm aluminium alloy, the first flank on its razor blade shows 1 ° , 0.
1mm is wide, and match completely with blade of curvilinear form cutting. Aluminium alloy is a kind of stuff that has good machinability, 1/3 what force of cutting of its data unit is steel about, melting point is 625 ° . No matter cutting speed has many,this kind of low melting point is meant tall, the temperature of cutting area won't exceed 625 ° . Appearing excessive wear away, before was not being affected to the intensity of cutting blade, hard alloy razor blade can bear very high temperature. Higher cutting rate rises subsequently to the requirement of power. In fact, a when aluminium alloy high speed is machined common problem is the machine tool power with very great need, this often can bring about purify of the metal below unit power comsumption to lead on the low side. Accordingly, normally requirement machine tool still can be offerred below high rotate speed output power greatly as far as possible -- when high speed machines aluminium alloy, as a result of cutting tool improve and making what need power to reduce is very beneficial. From the point of the viewpoint of cutting tool, advocate cutting force has conclusive effect to power demand. The power that reduces unit material purify to measure place to need is having apparent openly effect to application of aluminium alloy milling, the incorporate production in every working procedure efficiency is taller, and machine tool process capability is stronger also. Before horn besides the decision cutting is light besides, also can affect advocate cutting force. Design of new-style razor blade carries the part before increasing, at the same time with bit geometry compose model others matchs each other, can reduce cutting force as far as possible, used design of new-style CoroMill 790 razor blade to reduce power demand greatly. Cut easily man-hour is added in milling, increase quickly of force to prevent initiative cutting, cutting blade need cuts work as far as possible stage by stage (if establish the corkscrewed yarn of milling cutter to be cut stage by stage along integral hard alloy,enter) , this will affect the size of radial cutting force, direction and increase rate, affect cutting tool to be out of shape from this and the size of workpiece appearance error. Shanteweikekeleman discovers through be opposite form of chamfer of razor blade of new-style CoroMill 790 undertakes designing, make its can undertake cutting with older rate and deepness, can arise to be cut advantageously lengthen effect -- the concussion effect when remarkable slow down is entered, make the error receiving a knife of face of milling of spare parts radial the smallest thereby change. In addition, also can reduce axial cutting force greatly, this means treatment apparently the pressure decrescent that brings to bear on by cutting tool, this is the element that needs a consideration when machining thin wall spare parts. Through deepening the chamfer breaking bits on face of the knife before bit, reduced cutting force, optimize the figuration that cut bits and platoon bits -- fly off and be far from cutting area and workpiece surface. The knife of form of this kind of chamfer, bits interface is smaller, have smaller attrition force and smoother cutting effect, can use bigger cutting deepness. Although because its are more sharp,the cutting blade of bit looks,mix bits chamfer is deeper and appear flimsier, but actually its stress level won't prep above is opposite blunter cutting blade. Have the aid of more the designs method, more perfect nicety computation of systematization, emulate and check an instrument, can develop more reasonable bit structure, cutting performance is more superior, and enough security. CNC Milling