The technology of mill coming back of economy, actual effect, unifinication by more and more apply widely, in order to replace car, mill, grind wait for a tradition to machine craft. The hi-tech function index of machine of mill coming back reflects the high spirit of the tall tigidity in the machine tool and process to be spent definitely, in addition consider to equip to whether deserve to the torque driven type that measures system and CBN tool directly comes back even milling head. Machine of mill coming back can complete the good treatment to workpiece directly, the burnish working procedure in saving a tradition to machine a method (graph 1) . The another advantage that nots allow to ignore is: When mill coming back, because workpiece rotate speed is very slow, operation personnel can detect at any time in machining a process already machined the cochlea shank diameter that go out. "Combination 90 " the machine tool is Germany person · holds limited company of technology of thunder person production and German thunder in the palm graceful the new generation that limited company develops development together comes back mill machine, can machine the EPS screw with an exterior extremely high quality directly, do not need any follow-up nap working procedure. Graph the PW series machine tool that 1 Germany Lei Shigong manages grows workpiece in the light of big diameter, undertake efficient the German Lei Shisheng that mill coming back has 400 stuff produces technical limited company (Lei Shi of Germany of the following abbreviation) major servicing is machine of mill of responsible complete set coming back (use at producing to have whorl and the component that are like whorl structure) the production with the machine that play slot. In addition, the company still provides the tool of milling He Xuanxi that develops development completely by oneself. German Lei Shi is the machine of mill coming back that is famous in the whole world and business of production of the engine that play slot, its product is applied to wet, dry, hard a variety of treatment craft. The machinery of German Lei Shi that person be subordinate to belongs to German thunder to be given priority to in order to produce turbine blade creates joint-stock company, this company was born 1905 to build by Lei Shixian of Bao Er · . Nowadays, the machinery of German Lei Shi that still is household company makes joint-stock company already became the technical partner that tradition and innovation have both in a lot of advanced technique domains, involves production manages a domain to include aerospace, the sources of energy, shipping, mechanical equipment to make, imitation data industry and auto industry. Client of benefit of technical innovation, benefit all the time, it is Germany the service tenet that Leishisheng produces technical limited company. In last few years, the company is especially inside development, processing technique respect acquired outward turning mill a series of progress. Through this treatment craft accurately treatment gives ball guide screw to reach its the main shaft of nut, pump, prejudicial screw, whorl shape that changes screw, EPS screw, gear screw, bone to hammer and domain of other and special application product. The company is returned with in the German thunder with famed domain of scroll science and technology person · is held in the palm graceful limited company together, provide the client's most advanced technology and the most excellent service together. What is mill coming back? From treatment tool and respect of mechanical movement principle are told, mill coming back is a kind of of milling craft special form. It is with craft of outward turning mill exemple, treatment tool is one inside file tine rotates bit body, namely milling cutter is located in bit body inside. When treatment centrifugal bit body rotates around workpiece with tall revolution, workpiece circles axes roll with slower rate. Bit body decided the rake of whorl for axial corner with X line, the trend of the tangent plane that assures milling cutter at the same time and whorl is consistent. The fluctuation radial feed of axis of X of bit body edge decided the deepness of whorl. The engine of mill coming back that by Germany Leishisheng produces can machine a different rake, the or so two-way whorl of different deepness. According to diverse treatment demand, bit body and add workpiece to be able to be retrorse roll along same way or each other (graph 2) . Graph sketch map of craft of treatment of 2 mill coming back machines craft this kind to have two big distinct advantages: The first, revolution of the workpiece when treatment is very low, have 20r/min only, avoided to machine the blame counterbalance negative effect to workpiece itself so, improved completely machining longer when workpiece, the Yi She that often appears bends a phenomenon easily; The 2nd, the mechanical movement characteristic of this kind of craft makes what be dropped by even mill drossy the quantity of heat of the generation when taking away treatment, avoided the effect of this kind of heat energy to workpiece completely. Differ with machine of common thread milling, what machine of mill coming back drops in the mill in machining a process is drossy, similar comma appearance, this kind flexible the advantage that machines a characteristic depends on managing mechanical kinetic energy while, raised cutting speed and feed rate, improved manufacturing efficiency greatly. At the same time perfect exterior quality can be rivalled with burnish craft photograph. The cutting tool material of machine of mill coming back has pottery and porcelain and hard alloy two kinds, the high content of the carbide in these two kinds of material, nitride raised the durability of the tool greatly, prolonged the service life of the tool. Additional, what drop as a result of the mill in machining a process is drossy the quantity of heat of the generation when taking away major treatment (80% ～ 90% ) , workpiece itself does not suffer his to affect, so most circumstance falls to be able to undertake working machining to workpiece, saved a good deal of expenditure that is used at cooling lubricant and clean job so. The specific requirement of German Lei Shike according to the client, offer the opportunity of mill coming back of all sorts of norms and configuration, from the mainest 5 axes machine tool (A axis, C axis, X axis, Z axis, numerical control operates tailstock) , to the machine tool that contains a back to maintain bracket, built-in bracket and system of automatic outfit discharge to wait to be able to deserve to have 15 axes at most. Allow to design through holding the Gao Shui that accuses system and gearing, leishidi offerred Germany to represent most the machine tool of mill coming back of the advanced technique. The manufacturing efficiency of machine of Lei Shixuan mill compares Germany tower above of general fore-and-aft turning machine is severalfold, because general fore-and-aft turning aircraft can undertake only way is machined only, the production of spare parts of very inaccessible high level asks. Current, the machine of mill coming back of German Lei Shi already applied extensively all over the world, advocate if produce main shaft of ball guide screw and its nut, pump, model with a future life,change the screw, worm that changes screw, EPS screw and other and special application to the domain. The pinpoint accuracy that manufactures technology and batch productivity decided manufacturing economic benefits. CNC Milling