Summary: The main load when high speed milling cutter works is centrifugal force, centrifugal force can bring about cutter hub too broken and cause grave accident. Germany undertook to the security technology of cutting tool of high speed milling the system studies, put forward " high speed rotates the security of milling cutter asks " standard proposal, those who developed design of milling cutter structure is modular finite yuan (FME) computational model, improved milling cutter composition, the safe technology that is high speed milling cutter laid a foundation. Keyword: BingzhenAbstract of of Situation Of Safety Technology For HSC Milling ToolsZhao of technology of security of high speed milling cutter: A Very Serious Accident Could Result From The Milling Tools Used At Increased Peripheral Speeds Due To The Large Centrifugal Force. A Series Of Research Work On The Safety Has Been Carried Out In Germany And The Following Achievements Have Been Made: Drafting A Standard Proposal About Safety Requirements For Milling Tools, developing A Modular FME Model For Designing, then Putting Some Suggestions For Structure Improvements. Keywords: of HSC Milling Tool Safety Technology raises cutting rate is the objective that metallic cutting technology pursues for a long time, also be cutting treatment raises the efficiency, main measure that reduces cost. The history of machining proves, of cutting speed rose to bring enormous technical economic benefits for mechanical manufacturing industry, the rises to still reflecting level of technology of mechanical production whole progress of cutting speed. Begin from 80 time metaphase, production technology entered the new period of a full-scale development, its characteristic is with raising cutting speed and feed speed are a target, main content includes high speed main shaft unit, fast feed and add high (decrease) the machine tool structure of system of the drive system of speed, high-powered fast CNC control, tall tigidity, exceed material of strong cutting tool and coating engineering technology to wait. The comprehensive progress of production technology is promoting cutting technology to high speed cutting (HSC) new level. The photograph of cutting of alleged high speed when popularizing hard alloy cutting tool with 559 time is compared, this round high speed cutting not only cutting speed has twice rise, and can cooperate to use high feed rate and small cutting deepness, realizing tall productivity while make cutting force is reduced, still rose to machine quality thereby. Current, high speed cutting has been mixed in aviation industry, mould industry car industry is taken seriously, extending to wider applied field. The core of high speed cutting is high cutting rate, as a result of the diversity of cutting tool material, workpiece material and treatment craft, the rate target that defines impossibly to high speed cutting with will define. Wait for circumgyrate cutting tool to milling cutter, serve as with the rotate speed of cutting tool or main shaft normally measure a level, according to different cutting tool diameter, now level is average above of 10000 ～ 20000r /min regards a rotate speed as high speed cutting. Because be in above of limits of this rotate speed, drive of the main shaft to clip of cutting tool material, structure, outfit and machine tool, structure, feed and CNC system raised special requirement, need develops new technology, among them the problem of a technology that the security of milling cutter structure develops place of high speed cutting to must be solved namely. Milling is the main technology that at present high speed cutting uses, milling cutter is cutting tool of main high speed cutting, include face milling cutter, establish milling cutter and mould milling cutter. This kind of cutting tool wants to bear partly each when high speed rotates very great centrifugal power, its action exceeds the action of cutting force far, become the main load of cutting tool, too big from mental efforts enough brings about cutter hub broken. The graph shows the face milling cutter that is company of Walter of a Germany 1 times to explode when 36700r /min the condition after breaking. Graph the 2 milling cutter taking a power that are 12mm of a diameter arrive in turn up when 36000r /min bend, the case that rupture. Once this kind of damaged happens, handlers often has not enough time to adopt check measure or avoid, cutter hub explodes the shiver that fly or swing the part that give to be able to cause great harm to handlers, make workpiece of machine tool equipment, treatment damages badly, bring very big immediate pecuniary loss, cause shutdown stop production even, affect the delivery of the product, pose the legal issue between tool manufacturer and user. Accordingly, research the security technology of high speed milling cutter, prevent this kind of tool that causes by centrifugal force to damage, it is further progress and the necessary premise that apply high speed cutting, have important real sense. Graph 1 graph 2 Germany is at the beginning of 90 time the research that began technologies of pair of security of high speed milling cutter, in machine Manufacturers Association (VDMA) below support, in order to amount to Musidate (Darmstadt) university production technology and machine tool institute are core, formed the working group that joins by cutting tool manufactory, institute and user, pursue the research of technology of security of high speed milling cutter. Through job of nearly 10 years, obtained a series of level sex positive result, drove worldwide inside the development of technology of high speed cutting. Their main research achievement introduces below. Above all, the experiment proves the structure of common milling cutter and intensity cannot get used to the requirement of high speed cutting, because common milling cutter is not for high speed cutting design, fair without the course intensity consideration and safety examine. When machining aluminium alloy with this kind of cutting tool, had not achieved by treatment material the half of optimal cutting speed, the clamp system of cutter hub or razor blade with respect to invalidation. Working group above all " high speed rotates to milling cutter is designed and experiment directive opinion " undertook study, on this foundation, drafted 1994 " high speed rotates the security of milling cutter asks " DIN standard, from legal angle standard manufacturer and user are in the design, behavior when make and using high speed milling cutter and responsibility, the design of high speed milling cutter, directive opinion that make and uses offerred on the technology, set standard of uniform security check proved recipe, in order to raise the safe consciousness of tool manufacturer and user, assure the safety of high speed milling. Draft standard set its suitable scope, namely the speed limit of high speed cutting, exceed this one limit, centrifugal force becomes the main load of milling cutter, must use safe technology. If the graph is shown 3 times, music (fold) the limits of high speed cutting that the milling cutter that the area of line above sets for the standard must examine through safety: The sheet to 32mm of diametical D1 ≤ cutting tool (integral cutting tool or solder cutting tool) , limits of high speed cutting is 1000m/min of cutting speed ≥ , namely the area of above of line segment AB; To the assembly of 32mm of diametical D1 ＞ type engine places cutting tool, limits of high speed cutting is the area of above of line segment BC. The security that the standard provides detects include a form to examine to experiment with the centrifugal force of sample cutting tool. The content that the form examines includes the data of pair of blueprint paper, computation, dimension, examination that assembles condition and exterior. The centrifugal force experiment of sample cutting tool divides kind of case: To cutting tool of machine clip type, in 1. 6 times at the biggest use rotate speed (Np ＝ 1. 6nmax) next experiments, of cutting tool permanent be out of shape or the displacement of the spare parts does not exceed 0. 05mm, perhaps be in 2 times at the biggest use rotate speed (Np ＝ 2nmax) next experiments, cutting tool does not happen explode broken; Must be to integral type cutting tool below condition of Np ＝ 2nmax experiment and do not happen to bend or rupture. Standard requirement manufacturer should the biggest use rotate speed cutting tool (Nmax) with clarity of concerned feature parameter, brand the ground, permanent designation is on cutting tool, provide necessary proof file and safe service instruction to the user along with cutting tool. The standard still offerred the directive opinion that high speed milling cutter designs. The guidance of the security technology that provides in the standard and supervise below, the high speed milling cutter that at present Germany produces has achieved very high security. Graph 4 it is an example that destroys experiment income data by centrifugal force, the milling cutter of diametical 80mm and 200mm parts to explode when 35000r/min and 25000r/min about broken, consideration safety factor 2, the oldest use rate that permits can achieve 4000m/min and 7800m/min respectively. The series of milling cutter of PCD high speed of Mapal company was considering safety factor 4 later, recommends permission is the biggest cutting speed is 6700m/min respectively (80mm of milling cutter diameter) with 8400m/min (200mm of milling cutter diameter) . Leave the need that mental efforts experiments to satisfy cutting tool sample, the university introduced the Sidate that amount to Mu a test facilities, top rotate speed can amount to 210000r/min, test range is: 250mm of cutting tool length, 200mm of cutting tool diameter, 10kg of cutting tool weight, established test program of the standard. This draft standard suggests to refer Europe to standardize committee as German DIN standard later, was adopted 1995, the corresponding period also regards the international standard of ISO as the opinion of proposal consult member state, the security that indicates high speed milling cutter gained extensive consensus in the world. Graph 3 graphs 4 to accelerate the development process of high speed milling cutter, the working group still undertook study with respect to the intensity computation of high speed milling cutter. The strength that points out those who prevent to be caused from mental efforts to destroy a key to depend on cutter hub is enough, the spare parts clamp of machine clip knife is reliable. When should regarding intensity of cutter hub of main load computation as centrifugal force, as a result of the complexity of cutter hub appearance, the result that reachs with classical and mechanical theoretical calculation has very big error, cannot satisfy the requirement that security designs. For this, university and Si Maer card ascend the Sidate that amount to Mu (Schmalkalden) joint development of company of production technology development what be used technically at high speed milling cutter is finite yuan of calculation method, this method is OK the bulk that imitate leaves cutting tool stress in different rotate speed and distributing (like the graph 5 are shown) , developed the computational module of bolt of cutter hub, blade holder, razor blade, clamp respectively, the combination that passes these module realizes the computation of whole cutting tool. This method is returned can imitate razor blade is in those who screw with the job load falls to be out of shape in the nailhead of slip, snail in blade holder. Computation shows, when rotate speed achieves 30000 ～ 35000r /min, bolt already amounted to critical stress and appear drawing is out of shape, before achieving critical rate, bolt arises above all bend, clamping force drops, bit produces displacement. In applying actually, the union of test and verify of centrifugal force experiment that designs imitate computation and sample rises, obtain cutting tool to be out of shape from experiment place, the attrib border condition that obtains establishing model institute needing in the data of bit displacement. Use finite yuan of computation model is OK the structure that analyses cutting tool in design phase, forecast the position of invalidation, the iteration that can reduce sample to experiment thereby frequency, accelerate high speed milling cutter to develop a process, reduce development cost, and can make the function of cutting tool rises further. The geometrical deflection of the orthogonal milling cutter that develops by this method can reduce 20 ％ , invalidation rotate speed can raise 10 ％ . Graph of standard of safety of milling cutter of 5 high speed make and finite the development of yuan of computation model, put forward to improve an opinion below to design and using of high speed milling cutter: (1) the action that cutter hub material leaves mental efforts to reduce and bear, the proportion of material of requirement cutter hub wants small, intensity wants tall, some high speed milling cutter already used high strenth aluminium alloy to make cutter hub now. Standard proposal, the choice of cutter hub material should depend on the rotate speed limits of the ratio of data tensile strength and density and application. Graph the 6 ultimate cutting speed that are the DIN8030 series milling cutter that makes with material of different cutter hub are compared. Because titanium alloy is unfavorable to the sensitivity of cut use at making cutter hub. (2) the chamfer on cutter hub of cutting tool structure (include the blade holder chamfer, chamfer that hold bit, key seat) can cause stress to center, reduce the intensity of cutter hub, because this should avoid a chamfer and bottom land as far as possible,take pointed part. The structure of cutter hub is answered say at rotor, make centre of gravity passes the axes of milling cutter. The clamp of bit and blade holder, adjust a structure to should eliminate windage as far as possible, it is good to and ask repeat polarization. Need to use the connection such as handle of contact, lengthen when also should avoid windage and rise repeat polarization. Actually, high speed milling cutter uses HSK knife handle and connection of machine tool main shaft mostly even construction of type of make it whole, repeat fixed position precision in order to raise tigidity and installation. In addition, the diametical hasten of milling cutter of high speed of machine clip type is small, height increases, tooth is counted also hasten is little, some has two tooth only, this kind of structure facilitates those who adjust tooth is jumpy, improve treatment quality. Graph 6 (3) cutting tool (piece) the join appropriate of clamp means cutting tool and main shaft uses HSK awl power or similar awl power structure. But dislocation razor blade is due central bolt Kong Huo has the empty knife check that can get stuck. For example one is plant but dislocation razor blade, bit underside has a round empty knife check, the raised photograph that can go up with cutter hub cooperates, action is uninstalled since the centrifugal force that goes up in clamp bolt to action. The clamping force direction of blade holder, razor blade is best agree with centrifugal force direction, control bolt even tighten force beforehand, prevent bolt to shift to an earlier date because of overload damage. To the milling cutter taking a power of small diameter, there is the clamp method of two kinds of high accuracies, tall tigidity now: Hydraulic pressure collet and heat are cold bilge shrink collet. Both quite, latter clip holds precision taller, delivered torque is compared former big 1. 5 ～ 2 times, radial tigidity is tall 2 ～ 3 times, can bear greater centrifugal power, more agree with the pattern with strong temper by dipping in water of milling of high speed of milling cutter of integral hard alloy. Japan and heart national capital developed what add hot device accordingly to be provided with Yu Dao to assemble and unassemble. The defect of this kind of collet is applicable diametical limits small, when cutting tool loading/discharging charges. (4) the dynamic balancing of cutting tool rotates in high speed when, the lopsided meeting of cutting tool produces to main shaft system additional radial load, its size and rotate speed concern into square, bring adverse effect to the security of cutting tool and treatment quality thereby. Accordingly " high speed rotates the security of milling cutter asks " standard regulation, the milling cutter that is used at high speed cutting must check through dynamic balancing, the G40 that should achieve ISO1940/1 to set balances quality grade, namely the unit weight of milling cutter allows lopsided quantity E not to exceed 3. 8197 × 105/nmax (Mm × G/kg) , the Nmax in type is the biggest use rotate speed. For this, the seat of setting adjustment dynamic balancing wants on the structure of machine clip milling cutter. Actually, milling cutter of high speed of current and certain precision work (or boring cutter) lopsided quality already achieved G2. 5 class (E ＝ 0. 23873 × 105/nmax) , balance sex is better than G40 class much, and dynamic balancing machine can go to the cutting tool that company of American balance technology rolls out evenly even G1. 0 class. Milling cutter installs precision to also can affect the lopsided result when milling cutter rotates in the repetition on machine tool main shaft, use HSK knife handle can make sure very tall repetition installs precision. Apparent, when undertaking dynamic balancing to milling cutter, be worth E (make an unit with μ M right now) adjust the repetition that is less than cutting tool installs precision (μ M) it is infructuous. Current, security technology already was made by the famous tool on the world manufacturer place is used, outside the high speed milling cutter that rolls out except the company such as German Walter, Mapal, the DIA9000 treatment aluminium alloy of company of Japanese Toshiba Tungaloy uses the milling cutter, special SUMIDIA diamond that stays in friendly electrical engineering company milling cutter made on the structure improve, in order to get used to the need that high speed machines, commendatory cutting rate is 3000 ～ 5000m/min. American Valenite company rolls out the high speed milling cutter that the diameter reachs 12 inches from 3 inches, cutter hub of its aluminium alloy amounts to 60HRC via the hardness after finishing, raised the wearability of cutter hub. CNC Milling