The main demand of material of milling cutter cutting part:

1)Tall hardness and wearability: Below normal temperature, cutting part material must have enough hardness talent to cut work; Have tall wearability, cutting tool just does not wear away, prolong service life. 2)Good hear resistance: Cutting tool can produce much quantity of heat in cutting process, it is especially when cutting rate is higher, temperature will be very high, accordingly, cutting tool material should have good hear resistance, still can maintain taller hardness below high temperature already, have can the function of proceed cutting, this kind has the quality of high temperature hardness, call hot rigid or red rigid again. 3)The tenacity of tall intensity become reconciled: In cutting process, cutting tool should bear very big wallop, so cutting tool material should have higher strength, otherwise easy rupture and damage. Because milling cutter can get concussion and vibration, accordingly, milling cutter material still should have good tenacity, just die not easily blade, disintegrate.

Milling cutter is commonly used material:

(1)Steel of high speed tool(abbreviation high-speed steel, high speed steel) , component is general with special purpose high-speed steel two kinds. Its have the following characteristic: The content of tungsten of A, alloying element, chromic, molybdenum, vanadium is higher, quench hardness can amount to HRC62, 70. Below 6000C high temperature, still can maintain taller hardness. Intensity of B, point and tenacity are good, fight Zhen Xingjiang, can use at making the cutting tool with cutting average rate, poorer to steel sex machine tool, use high-speed steel milling cutter, still can successful cutting. C, technical properties is good, forging, it is easier that treatment and blade are ground, still can make the cutting tool with more complex form. D, compare with phase of hard alloy data, still have hardness inferior, red rigid and wearability are poorer wait for defect. (2)Hard alloy: Titanium of tungsten of metallic carbide, carbonization, carbonization and the metallic binder that give priority to with cobalt did not seductively dressed or made up to golden craft is made and be become via pink. Its are main the characteristic is as follows: Can high temperature resistant, be in 800, the cutting property that 10000C left and right sides still can hold good, can choose when cutting taller than high-speed steel 4, the cutting speed of 8 times. Normal temperature hardness is tall, wearability is good. Bending strength is low, concussion tenacity is poor, what edge grinds not easily is very sharp. Commonly used hard alloy can be 3 kinds big commonly: ① tungsten is cobaltic kind of hard alloy (YG)YG3 of commonly used brand, YG6, YG8, among them the percentage that the number represents to contain cobaltic amount, the quantity that contain cobalt heals much, tenacity has healed, more impulse withstand with vibration, but can reduce hardness and wearability. Accordingly, this alloy applies to cutting cast-iron reach nonferrous metal, the steel that still can use cutting to pound the semifinished product with old sex and classics to quench with stainless steel. ② titanium is cobaltic kind of hard alloy (YT)Commonly used brand has YT5, YT15, YT30, the number represents the percentage of carbonization titanium. After hard alloy contains carbonization titanium, can raise the sticking temperature of steel, reduce grind coefficient, can make hardness and wearability rise somewhat, but reduced bending strength and tenacity, make property becomes fragile, accordingly, this kinds of alloy gets used to cutting steel kind spare parts. ③ is general hard alloyRight amount rare metal carbide is joined in two kinds of afore-mentioned hard alloy, wait like carbonization Tantalum and carbonization niobium, make its grain is refined, raise its normal temperature hardness and high temperature hardness, wearability, stick receive temperature and fight oxidisability, can make the tenacity of alloy increases somewhat, accordingly, cutting tool of this kind of hard alloy has better integrated cutting performance and versatility, its brand has: YW1, YW2 and YA6, because its price is more expensive, basically use at difficult treatment material, wait like high strenth steel, refractory steel, stainless steel.

The sort of milling cutter reachs mark

1, the sort of milling cutter:

Press the material cent of milling cutter cutting part: Milling cutter of A, high-speed steel: More complex cutting tool uses milling cutter of this kind of B, hard alloy: It is to use mostly solder or body of the mechanical Yu Dao that place firmPress the utility cent of milling cutter:

The A, milling cutter that machines plane: Groove of the B such as columnar milling cutter, upright milling cutter, treatment (or rank stage) milling cutter: Establish milling cutter, dish form milling cutter, curium the C such as a milling cutter, special the milling cutter that shape face uses: Figuration milling cutterPress the tectonic cent of milling cutter: A. Pointed tine milling cutter: The cut form of tooth back is linear or broken line, make and it is easy that blade is ground, point is sharper. B. Shovel tine milling cutter: The cut form of tooth back is an Archimedes corkscrewed yarn, after blade of this kind of milling cutter is ground, the horn before wanting only is changeless, tooth form is changeless also, appropriate figuration milling cutter2, the mark of milling cutter (Material uses W18Cr4V commonly) measurement standards mark: 3 columnar milling cutter, blade, curium a milling cutter with the aperture inside X of width of external diameter X (X angle or circular arc radius) , diameter of the circle outside establishing milling cutter and keyway milling cutter to be tagged only commonly.

The each share tag of milling cutter

① tool reference plane: Go up through cutting knife a bit more aleatoric nod the planar ② with cutting perpendicular speed with this tool cutting edge plane: Adopt range of the knife before the planar ③ with cutting as perpendicular as tool reference plane blade: Cut area of the knife after the planar ④ that bits pours out of: With the side with treatment opposite surfaceThe main geometry angle of columnar milling cutter reachs action

γ of the horn before ① 0: Before the included angle between knife face and tool reference plane. Action is to make the crucial point sharp, the metal when cutting is out of shape reduce, cut bits easy eduction, make thereby cutting save labour; α of the horn after ② 0: Hind the included angle between knife face and tool cutting edge plane. Its main effect is the friction between face of the knife after decreasing and tool cutting edge plane, reduce the exterior surface roughness of workpiece; ③ horn coming back 0: The included angle between the tangent on helix tine edge and milling cutter axes. Action is to make progressively ground cuts tooth to mix cut from workpiece, raise cutting to make the same score stability. In the meantime, to columnar milling cutter, still have the effect that makes cut bits to be poured out of smoothly from end panelCarry the main geometry angle of milling cutter and action

The knife that carry mill blade of many deputy cutting, accordingly besides before horn, hind still have outside horn: Kr of ① tool cutting edge angle: Advocate cutting blade and the included angle that already machined the surface. Its change is affected advocate the length that cutting blade attends cutting, the width that the change cuts bits and ply ② deputy slant horny Kr ˊ : Deputy cutting blade and the included angle that already machined the surface. Action is to reduce deputy cutting blade and the friction that already machined the surface, affect deputy cutting blade to be opposite the blade of ③ of the action that repair light that already machined the surface is obliquitous λ S: Advocate the included angle between cutting blade and tool reference plane. Basically have the effect of inclined blade cut

Figuration milling cutter

Figuration milling cutter is the special milling cutter that is used at machining figuration surface, its edge profile needs a basis to be made design computation by treatment workpiece profile, the surface with complex form can be machined on general milling machine, can make sure appearance agrees basically, and efficiency is tall, be being produced group by group and mass-produced in be applied extensively. 1, the basic idea that shovels tine: Figuration milling cutter can divide the tine that it is a needle and shovel tine two kinds. The milling of tine figuration milling cutter mixes the needle to grind need again special profiling, make and it is more difficult that blade is ground. Tooth back of milling cutter of the figuration that shovel tine is be cut in the shovel on relieving lathe and become, weigh face of the knife before when grinding, be being ground only, because before knife face is planar, so blade is ground more convenient, at present figuration milling cutter basically uses structure of the tooth back that shovel tine. The tooth back that shovel tine should satisfy two requirements: Appearance of blade of the cutting after ① is ground again is changeless; ② acquires the part after needing. 2, tooth back curve and equation: The upright section plane that orders line of cutter shaft of perpendicular Yu Xi through the random on blade of milling cutter cutting, the hands in a line to call milling cutter tooth back curve of it and tooth back surface. Tooth back curve basically should satisfy two requirements: It is milling cutter after be being ground again every time hind horn is basic and changeless; Another it is to make simple. The curve with the changeless horn after can be being satisfied has logarithm corkscrewed yarn only, but make hard. The horn after Archimedes corkscrewed yarn can be contented is basic and changeless, make simple, come true easily. Use Archimedes corkscrewed yarn extensively on production to regard tooth back of figuration milling cutter as the curve so. By geometric knowledge, the vector radius ρ that nods each on Archimedes corkscrewed yarn is worth, wait for scale ground increase and decrease along with the increase and decrease that the corner θ of vector radius is worth. . Accordingly, as long as by wait fast of whirligig and edge radius direction etc fast sharp movement is both combination, can obtain Archimedes corkscrewed yarn. Will express with polar coordinates: When θ =00, ρ =R, (R is milling cutter radius) , when θ > 00 when, ρ <r, <p=""></r, is the general equation of tooth back of: milling cutter? Moldboard of ˇ ?R-CQ hypothesis not go back, criterion milling cutter every had turned π of =2 of ε of the horn between a tine / Z, the quantity shovelling tine of moldboard is K, suit with this photograph, the elevatory quantity of cam also should be K. To make moldboard can wait for fast shift, the curve on cam should be Archimedes corkscrewed yarn, reason is made easily. In addition, cam dimension decides to be worth at shovelling sales volume K only, the horn after aging with milling cutter diameter number is reached has nothing to do. Should produce sales volume only equal, cam can general. This also is the reason that at present the shovel ages tooth back of figuration milling cutter uses Archimedes corkscrewed yarn extensively. When R of milling cutter radius and shovel the K that cut an amount is foregone when, can get C already: When θ =2 π / =R-K of the ρ when Z criterion π of C= Kz/2 of ∴ of R-K=R-2 π C /z

The phenomenon that can appear after milling cutter passivation

1, look from the appearance that cut bits, cut bits to become bulky, submit a form, because cut bits temperature to lift, the color that cut bits empurples fumy. 2, the surface roughness of workpiece treatment surface is very poor, workpiece surface occurrence window has the trace that gnaw a knife or ripple. 3, the vibration with milling process very serious generation, and have abnormal noise. 4, look from blade appearance, blade has splendent white spot. 5, should use steel of mill of hard alloy milling cutter when, chang Fei gives much fire mist. 6, with steel of mill of high-speed steel milling cutter, if use oil kind when lubricant refrigeration, can produce a large number of smoke. When milling cutter passivation later, should jockey in time wear out condition of examination milling cutter, if tatty is slighter, usable oilstone is repaired grind cutting blade, next reoccupy; If wear away againer, must undertake blade is ground, wear away in order to prevent milling cutter exceeding.