Although low speed treatment won't replace high speed treatment, company of Dan Bo news thinks it can regard higher rotate speed as a kind of practical compensatory process instrumentation in the machine tool. In the milling treatment that makes plane part in aluminium, use new cutting tool and technology, can make the machining center of inferior rotate speed of a workshop develops bigger potential production efficiency. In " high speed is machined " in this phrase, outstanding those who emphasize is " speed " this vocabulary, but the high speed of main shaft moves is not its first goal. Contrary, the purpose that high speed machines, it is to balance the speed of main shaft only -- very high metallic cutting rate achieves in onefold milling treatment cycle, make as far as possible an original work, treatment is adjacent at a perfect spare parts. Perfect spare parts and rate of tall metal cutting are two different goals. Speed is a kind of method only -- but speed is not the only measure that achieves these two goals. In a few years of in the past, because the technology of cutting cutting tool is improved ceaselessly, make thereby job shops also can with inferior main shaft speed, achieve very high metallic cutting rate, accordingly, group of Boeing firm work teachs our company suppliers high speed processing technique, the processing technique that also teachs them inferior rotate speed now (graph 1) -- basically be the workshop that lacks high speed process capability in the light of those. To Boeing company, this one newer technology is dozen of move " low speed is machined " banner popularizes, actually, in " low speed is machined " in this term, must include manufacturing efficiency of Gao Shuiping. Graph 1 " high speed feed " the purpose that the dominant position that milling cutter uses axial to cut bits to attenuate will come to achieve tall feed to lead, even if relatively inferior main shaft speed also is such among them a spare parts can show this issue adequately. Pursue for example 2 shown aluminium make a part, it machines production through high speed on a when be in Boeing company large machining center, the rotate speed of this machining center can amount to 24000r/min. But the workload of that machine tool already exceeded scheduling, from go up somehow for, to the treatment of that spare parts production created constant pressure. But the machining center that this company still just has 4000r/min of a turn up (graph 3) . The work that the graph shows in 2 graphs, former the graph that is the treatment of milling of machine tool high speed that is 24000r/min through a rotate speed 3 machine through low speed, the working group that a rotate speed is the machine tool of 4000r/min to be able to machine company of Boeing of a spare parts with taller manufacturing efficiency milling almost now developed a kind of new treatment technology, with using the machine tool process capability of this inferior rotate speed to the greastest extent, result, this machine tool can machine production effectively these 10. To achieve this one goal, this work group still optimized low speed to machine a method further, help each supplier also use method of this one party. The rough machining that this one craft involves tall feed to lead milling cutter, and integral hard alloy establishs milling cutter the deepness cutting of the heavy load that cut bits. This craft still has the characteristic of fast finish machining that uses high amount to cut bits chamfer to establish milling cutter. The moving handling time of this spare parts is 61min all the time. This is the actual run time with high speed periodic treatment, include cutting tool change and add / slowdown time. When using new low speed to machine craft, the moving handling time of same part is identical almost -- it is 67min about. Engineer Mr Eric Stern of Boeing company is a member in team of treatment of st. louis factory, this working group is the one part of company research and technology. He emphasizes saying, high speed treatment remains desirable. Generally speaking, the manufacturing efficiency that high speed machines is taller, and its efficiency often very apparent. If if its process designing reachs his,craft obtained what what obtain finally like craft of low speed treatment to be analysed more in that way, afore-mentioned high speed machines periodic time to perhaps be met under 61min, even under 1h. However, serve as for a short while with this acceptability fiducial, so low speed treatment already approached this one level quite. This to a lot of suppliers, have very great sense. A lot of manufacturer do not have machining center of a high rotate speed, whether does prep let alone have enough work to be able to machine production. Still have other a lot of manufacturers are faced with high speed machine tool exceed a plan to run a problem, and the machine tool of inferior speed inside the workshop is in unused condition however. Manufacture efficiency to help job shops rise with all sorts of speed levels, the working group of Boeing company hopes through the supply of this company catenary enlarges its productivity. Achieve taller manufacturing efficiency to make low speed is machined, the working group of this company was offerred a few more the following manufacturing secret of success consults for everybody. Nextpage returns rough machining to be in the high speed treatment of aircraft spare parts, differentiate rough machining production and finish machining production can say is to do not have necessary, because the treatment of workpiece is,achieve final measure through the puissant and accurate cutting to material. However, low speed treatment needs to return rough machining and finish machining, boeing company says so. Because rough machining may need the cutting treatment of great horse power,this is, and the size of ultimate noncombatant duty that should reach a part, using high power cutting to machine is improper. In rough machining, its key is to want to use the great horse power of the machine tool to machine a characteristic as far as possible. On a machine tool that does not have high speed main shaft, use a kind when high power is machined even if provide high production efficiency to replace a method. Want to produce the major power of a machine tool, involve pair of different cutting tool possibly choose an experiment. In the treatment of that spare parts that mentions in front, the working group of Boeing company, the rough machining that applied a standard at first establishs milling cutter, use at machining aluminium to make a part. The rate of highest metal cutting that place of this cutting tool permits is 6. 3in3/min, the power that its use is 2hp(1hp=735 only.
5W) . As contrary as this, when using different cutting tool, pursue for example 4 show cutting tool of SwiftCarb rough machining, the part with same cutting, the power that can make the machine tool is used is achieved 14.
5hp -- the space cutting bits that the drossy effect place that due to of its part reason cuts bits chamfer to design provides. The rate of corresponding metal cutting when using this one cutting tool to machine is 45in3/min. Graph when 4 pairs of aluminous material undertake rough machining, the clearance cutting bits of this one cutting tool makes it can achieve higher than standard cutting tool metallic cutting rate. And more important is, main shaft of low rotate speed can have a test with rough machining cutting tool, so that find a kind to be able to make full use of the appropriate cutting tool of machine tool power (right go up) the end that uses the chamfer that cut bits to obtain precision work to finish machining, the best cutting tool that its choose is different. When low speed main shaft is machined, use to contain the very much chamfer that cut bits establish milling cutter treatment, can raise minutely feed rate, achieve very tall production efficiency. Like the graph 5 shown milling cutter contain 10 chamfer that cut bits, it is the cutting tool of a standard. Boeing company recommends this cutting tool to apply at the finish machining of titanium metal. This cutting tool is very tall also to the finish machining efficiency of aluminous metal. In fact, when machining aluminous metal, 1in(1in=25.
The cutting tool of 4mm) diameter can arrive deep 0.
The cutting on the radial deepness of 3in moves, deepness of its axial cutting is 1in -- but these parameter need not consider when machining titanium metal. Graph the 5 cutting tool that contain a large number of chamfer that cut bits can allow to use very high feed rate, no matter whether its are main shaft of low rotate speed. Boeing company uses a cutting tool that contains 10 chamfer that cut bits so, use at the finish machining cutting of reinforcement, the depth range of its axial and radial cutting is mixed for 1in respectively 0.
3in. Round part of interior of treatment of this cutting tool is not good, before using this cutting tool accordingly, should use other cutting tool to machine inner circle horn above all (left below) what bring to sb's attention answers when using this one cutting tool to machine is (generally speaking, aircraft spare parts uses low speed to machine) : Must machine the inner circle horn of the spare parts above all. A lot of inner circle part are contained in plane structural member, this is very typical, because this structural member often is comprised by a lot of recess. If use finish machining cutting tool to undertake with spending radial cutting deepness gently milling is machined, so when cutting tool enters round horn, force of cutting of its radial clench the teeth can rise substantially. Accordingly, to protect the security of cutting tool and workpiece, must go in these fast finish machining before the knife moves, the material inside treatment purify round horn (the cutting tool) that uses different type. Cutting tool of other rough machining is other the cutting tool of the type appears very valuable also. Boeing company claims, among them main cutting tool is the milling cutter that has tall feed rate. "Tall feed is led " the figure of cutting blade geometry that cutting tool place uses, use axial to cut the dominant position that bits attenuates, will achieve than having more the taller feed rate that the place of corresponding cutting tool of standard geometry appearance can achieve. Measure when rough machining enough big and when allowing to use this kind of cutting tool, mr Stern says tall feed leads milling cutter to be able to become a kind of reliable treatment method, make machine speed to achieve 50~60in3/min, although main shaft rotate speed is below very low circumstance,also be such. Last kinds of cutting tool that is worth to consider to use is cutting tool of devoted type rough machining. Job shops won't consider to use a kind of such cutting tool process aluminium alloy data commonly. Most person regards devoted type rough machining the treatment method that is metal of a kind of horniness. However, when machining craft as a kind of controlled controlled when main shaft of low rotate speed, devoted type rough machining may become the treatment method with manufacturing highest efficiency, even if the data with weaker treatment. Choose specificly depend on the appearance of recess, the basis plays the need that machines together, should understand particularly need to leave amount of how many abundant after all. If offer,have high speed main shaft, so talk about devoted type rough machining to appear no point, boeing company says so. However, assuming is machine tool of treatment of a low speed, so this one technology may become a when realize highest productivity main factor. The explains a rotate speed is 4000r/min machining center that machines about low speed can be the machine tool of type of production that a milling processes aluminous material. The machine of factory of Boeing company st. louis machines research and technical group to say, when main shaft rotate speed is restrained, the productivity with these highest to obtaining technologies is very crucial. Can make the power of the machine tool is achieved the biggest change! In rough machining when, answer to use the power dominant position of main shaft as far as possible. Can make deepness of cutting of the main shaft speed of the machine tool, axial and radial cutting deepness are achieved the biggest change. Try to make all highest performance that these parameter achieve cutting to machine place to allow. When rough machining, use cut bits negative charge high. When using integral hard alloy to establish milling cutter to process aluminous material, the relatively actual negative charge that cut bits should achieve every tine at least 0.
010in. Gao Jin can allow to cut bits bear to amount to every tine to the milling cutter of rate 0.
050in. When finish machining, although speed is inferior, but the cutting tool that contains a large number of chamfer that cut bits can achieve very high feed rate. Inner circle horn needs to have machine treatment before in the finish machining of reinforcement. CNC Milling
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