The research of efficient milling cutting tool and production

R.

L) held water 1952, it is one of manufacturer of production of world main cutting tool, set manufacturing machining center in the main industry country such as Italy, Spain, France, Switzerland, Germany and area. Production of limited company major uses Kaerbida at cutting the top-ranking cutting tool of the material such as special metal, hard alloy, razor blade, the product is applied at aerospace, car to make widely, the industry such as machinery of mould, turbine. Milling cutter and contrast of traditional milling cutter block Kaerbida material of parameter of the structure that the research that Er comparing tower adopts qualitative to workpiece material, structure ceaselessly will come to to improve calorie of Er to compare tower cutting tool, geometry, cutting tool, achieve the goal that improves cutting efficiency thereby. In order to block Er newester than the tower the Silmax milling cutter that roll out is exemple, this milling cutter is used at major to machine alloy of the stainless steel with aerospace commonly used industry, nickel radical and titanium alloy. Traditional milling cutter is A=b normally on geometrical design, but in B of ≠ of the A in Silmax milling cutter, l ≠ L1, this kind of new-style 4 blade geometry is designed, dispersed effectively cutting force, reduced the vibration of cutting tool in use, improved manufacturing efficiency thereby, achieved lengthen the cutting tool life, goal that reduces cost. When traditional milling cutter is machining alloy of stainless steel, nickel radical and titanium alloy, normally its are cut deep can achieve only 0.

1mm, when the milling cutter after improving a composition is machining afore-mentioned material to pledge, cut deep can achieve 1D. It is with the milling cutter of D10 exemple, if want the material of mill ream 10mm, traditional milling cutter needs a knife 10 times to just can complete treatment, and it is OK that milling cutter of this kind of Silmax needs a knife 1 times only. Place laying a plan shows milling cutter to have the following and clear advantage: Radial and axial are cut add greatly greatly big, improve manufacturing efficiency thereby; Before the successive gradual change of horn and helix angle angle reduced Dao Zhen effectively; Use design of this kind of geometry, action the pressure at cutting blade is very little, reduce cutting tool effectively to wear away thereby, prolong cutting tool life; Design of new-style the chamfer that break bits makes a bits more easy. Annulus the undee parameter of blade of mode of groovy thick milling cutter (Mm) undee parameter the first group deepness of the 2nd group of the 3rd group of weaveform 0.

260.

360.

46 undee pitch 1.

41.

561.

7 undee radius 0.

430.

510.

65 below introduce card Er to be in than milling cutter of tower christmas tree rotor annulus chamfer is efficient the application that processes a respect. The trade is made in turbine, turbine rotor annulus groovy treatment is a complex and important working procedure. The rotor of large steamer aircrew annulus even if cultivate form annulus chamfer,groove all is, its form tolerancepublic errand demand is very high. Normally treatment craft is rough machining, semifinishing machining, finish machining to wait. Current, domestic turbine makes a trade the rough machining of rotor annulus chamfer and semifinishing machining use common helix taper thick milling cutter and common half essence milling cutter normally. In machining a process, as a result of cutting tool and be accumulated by the interface of surface of treatment spare parts bigger, produced very big friction, also produced very great cutting power and very tall heat in metal cutting thereby. Cut bits more also, cannot eliminate as soon as possible, produce very big effect to the cutting efficiency of cutting tool and service life. In recent years, national power facilities develops quickly, the manufacturing task amount of turbine production industry is very large, the treatment that ensures the qualitative ground that maintain a volume to finish rotor annulus chamfer on time made an urgent task, annulus the efficient sex that groovy milling cutter machines became urgent matter. The structure of round of Kaerbida's new-style groove thick milling cutter is wait for structure of blade of helix angle mode, annulus half essence milling cutter is groove mode blade structure. Annulus the experiment of groovy milling cutter studies to rotor annulus groovy treatment, the respect such as dosage of material of parameter of the structure that we are aimed at round of groove milling cutter, geometry, cutting tool and processing of aggrandizement of cutting tool surface, cutting undertook study contrast. The research of cutting tool structure ever was opposite the following 3 kinds of chamfer had undertaken study: The first kind is circular arc form: Machine easily, but two sharp drop quantity of heat center cutting blade ministry, medicinal powder heat is slower, intensity is poorer, easy wear away. The 2nd kind is echelon: Two needles nod cutting blade ministry strength is better. But cutting tool produces stress concentration easily in the bottom land in use process, made collapse blade. When blade grinds this chamfer, two needles nod emery wheel to threshing easily, groovy form assures not easily. The 3rd kind is circular arc echelon: It has the characteristic with higher intensity of echelon chamfer point of a knife, have bottom land circular arc to generate the profit that stress centers easy treatment, not easily again. 3 kinds of chamfer contrast passes experiment analysis, we chose chamfer of echelon of the 3rd kind of circular arc model, apply at production. Chamfer of circular arc echelon although the effect is better, but the problem with still exist particular. Above all, cutting tool blade grinds quality to be not stabilized, treatment efficiency is low; Next, ministry of blade of the chamfer that divide bits has inflection point (namely blade pointed) , concentration of quantity of heat, easy wear away. Mode blade annulus of groovy thick milling cutter introduce the blemish that solved afore-mentioned chamfer existence. Alleged mode blade also is a kind of the chamfer that divide bits actually, just blade differ somewhat, the formal blade that mode blade grinds the milling cutter cutting blade on the machine tool to press curve of similar sine wave in numerical control blade namely is ground come out, blade ministry curve is pliable join. The wave crest trough on every cutting blade is mutual and complementary, make machine the level off of spare parts surface that come out. It has blade pointed strength tall, medicinal powder heat wears away quickly, not easily, platoon bits force of smooth, cutting small, durability is advanced characteristic. Between research process, we are thick to round of chamfer of 3 groups of data the blade of blade of milling cutter mode undertook an analysis. Experiment analysis makes clear, the choice of the dimension of wave blade, appearance also has certain effect to the performance characteristics of cutting tool, if undee pitch is too small, intensity of point of a knife is low, heat in metal cutting can be centered on point of a knife, cutting tool is easy wear away, the service life of cutting tool is reduced. Undee pitch is too big, cutting blade and workpiece contact area are large, can produce force of very big friction, cutting and very tall heat in metal cutting, also have very big effect to the service life of cutting tool. 2396-1005 annulus dosage of cutting of groovy thick milling cutter cutting dosage rotate speed of the first group of main shaft of the 2nd group of the 3rd group of quadruplet (R/min)300360400470 feed speed (Mm/min) 22304545 contrasts through the experiment, the 2nd group data is when undee deepness namely 0.

36mm, undee pitch is 1.

56mm, undee radius is 0.

When 51mm, the durability of cutting tool is best, and cutting effect is optimal. Mode blade annulus groovy thick milling cutter is taper milling cutter, diameter of place of point of a knife is lesser, not easy blade grinds mode blade, blade is ground badly to can affect cutting tool intensity. The first undee chamfer should be in blade ministry be apart from point of a knife place of 2 ～ 3mm is ground piece. Additional, half essence milling cutter also chose round of introduced chamfer mode blade, reduced cutting force thereby, reduced heat in metal cutting, make cut bits area decrescent, platoon bits is smooth, improved the cutting efficiency of cutting tool and service life. The affirmatory geometry parameter of geometrical parameter chooses whether reasonably, can affect the service life of cutting tool directly. To assure the accuracy of molded lines of rotor annulus chamfer and integrality, annulus of groovy essence milling cutter before horn and helix angle all choose to be 0 ° , annulus groove of half essence milling cutter before horn and helix angle can be in 0 ° ～ are chosen between 5 ° . Current, annulus helix angle of groovy thick milling cutter has " wait for lead " and " wait for helix angle " 2 kinds of forms, using these 2 kinds of forms is for cutting smooth, light, reduce impact, raise cutting tool durability. As a result of annulus groovy thick milling cutter is taper milling cutter, around diameter six to one, the geometrical angle change of cutting tool is very so big, the production that gives cutting tool, long grind bring very big trouble, the service life of cutting tool also will be affected. Wait for lead milling cutter to be in the position with large diameter, helix angle is controlled in 40 ° , and in the part of point of a knife with small diameter, helix angle has 2 ° ～ only 3 ° . In part of point of a knife, because the diameter is small, helix angle is small, want to produce greater cutting power necessarily, cause cutting tool damage very easily. The helix angle that waits for helix angle milling cutter is changeless, it does not change along with the change of cutting tool diameter. In the part of point of a knife with small diameter, have stable helix angle, can reduce cutting force, cutting is light, assured the durability of cutting tool thereby, and make, long it is very easy to grind. The course analyses contrast, mode blade annulus groovy thick milling cutter was used wait for helix angle form. Helix angle chooses to be 30 ° , horn is 10 ° ～ before 12 ° , the first hind horn is 12 ° , the 2nd hind horn is 25 ° , the durability of cutting tool and cutting efficiency are right now optimal. Cutting tool material and processing of aggrandizement of cutting tool surface analyse content of round of technology of groovy milling cutter tall, bring about its to create difficulty, the price is high. To raise cutting tool durability, prolong cutting tool service life, milling cutter used round of our chamfer a integral performance is better kind of special talent is qualitative, and use exterior aggrandizement entirely handle a technology. The method that exterior aggrandizement handles is very much, exterior coating, surface is for instance multivariate in all ooze, deep cold treatment. What at present we use is technology of exterior coating processing. In applying actually, we are planted to TiN, TiC and TiCN 3 coating undertook contrast, the effect of application of coating cutting tool that discovers TiCN as a result is better. The dosage of logical choice cutting of cutting dosage is the crucial factor that affects cutting efficiency and cutting tool service life. A few groups of data chose to undertake cutting contrast experiments in studying a process. Now with 2396-1005 annulus groovy thick milling cutter is exemple try to explain. The comparative experiment through data makes clear, the 3rd group of data namely main shaft rotate speed is 40Or/min, when feed speed is 45mm/min, the durability of cutting tool and cutting effect are the idealest. The correct and reasonable use cutting tool of cutting tool is used whether correctly reasonable, be whether develop its efficient the key of cutting character. Use correctly can obtain favorable economic result, will cause cutting tool to damage otherwise even the consequence that workpiece discards as useless. Outside be being installed except correct cutting tool, differ according to rotor even the treatment that will make every cutting tool grows round of groove size of level degree, make its are in reasonable treatment is used inside length limits, usually annulus groovy thick milling cutter is being machined 3.

5 ～ 4 after lengthening rice, annulus half essence milling cutter machines groove 4 ～ 4.

5 after lengthening rice, annulus groovy essence milling cutter machines 8 ～ 8.

5 after lengthening rice, must undertake be repairinged afresh grinding, cutting tool exceeds period excess load uses the estimate that can lower Dao Er to use life. CNC Milling