Cutting tool collet is controlled with what cutting tool diameter jumps

The diameter of 0127mm jumps to won't affect treatment function and cutting tool life possibly. However, for smaller to the diameter cutting tool, the likelihood needs smaller way to jump value ability satisfies treatment to ask. Cutting tool material is crucial also. For example, broach of integral hard alloy can reach longer than high-speed steel broach cutting tool life, but premise condition is must control diameter strictly to jump. In investigation of when in BIG Kaiser nicety cutting tool company undertakes informal user, everybody is accepted, 0.

0127mm is the way that can accept jumps value. This company decides to have a test to different cutting tool, in order to evaluate this one standard reasonable. Japanese big clear and center of technology of company of aircraft of essence of life undertook getting cutting an experiment (cutting condition sees a table 1) , every kinds of broach has a test below same condition, evaluate a consideration diameter to jump every time change. Watch 1 auger cut material of experiment condition test specimen: Speed of cutting of 1055 steel surface (hard alloy) : Speed of 76m/min surface cutting (high-speed steel) : 27m/min feed leads: 0.

1mm/r bore deepness (3D) : 12mm bore deepness (5D) : 15mm broach diameter: 3mm the diameter of the broach of integral hard alloy of 3mm of the first diameter jumps the value is 0.

002mm, in advocate cutting blade appears 0.

Of 2mm wear away (can think right now be over of life of this cutting tool) before, machined 148 deepness to be the aperture of 3 times aperture in all. The diameter of broach of integral hard alloy of 3mm of the 2nd diameter jumps the value is 0.

005mm, below same cutting condition and standard of cutting tool life, machined 125 aperture only. After this, jump with diameter again the value is 0.

01mm and 0.

The hard alloy broach of 015mm undertook twice getting cutting an experiment, the result makes clear, cutting tool life jumps as diameter the accretion of the value and shorten. The 2nd experiment is used jump with 4 kinds of afore-mentioned same way the aperture that the high-speed steel broach of 3mm of value, diameter machines hole depth to be 3 times aperture. The 3rd experiment and condition of before two experiments are same, just use diametical 3mm inside the aperture that broach of cooling high-speed steel machines hole depth to be 5 times aperture. Assaying result, can reach the following at 2 o'clock conclusion: (1) the susceptibility that because diameter jumps,hard alloy cutting tool is opposite and causes cutting tool loss of life is highest. Jump when diameter value from 0.

015mm is reduced 0.

When 002mm, the cutting tool life of broach of integral hard alloy raised 2 times. Need attention, in our investigation, cutting tool user thinks, 0.

The diameter of 0127mm jumps the value is OK accept (average) . (2) the susceptibility that because diameter jumps,high-speed steel cutting tool is opposite and causes cutting tool loss of life slightly under hard alloy cutting tool. Jump when diameter value from 0.

015mm is reduced 0.

When 002mm, life of high-speed steel cutting tool rose 1.

3 times. The susceptibility that cutting tool of cooling high-speed steel jumps to diameter inside is lower, jump when diameter when the value is reduced, life of its cutting tool rose only 60% . If the roll of broach and its center line are diverse heart, can produce greater radial cutting power on its highest first flank, cause broach unilateral wear extent to increase. Be based on the average result that undertakes to hard alloy and high-speed steel cutting tool cutting experiments, data of this one wear extent is used at deciding efficiency of cutting tool life. Use this data, can jump according to diameter the value will decide efficiency of cutting tool life. Accordingly, diameter jumps for " 0 " (theoretic) be equal to efficiency of cutting tool life for 100% . Jump when diameter the value is " acceptability average " 0.

When 0127mm, cutting tool life reduced an in part. The cutting tool collet that a lot of job shops use (if 3 claw get collet) make broach diameter jumps the value exceeded 0.

025mm. Computation of test data extrapolate is narrated before the basis, diameter jumps the value is 0.

The Kong Shu that the broach of integral hard alloy of 025mm can machine still is less than 25. And service mass is taller (of course the price is more expensive also) get collet, can prolong cutting tool life considerably. Can be versed in with every Kong Jia cost will measure the cost that saves from this. The bit of integral hard alloy that uses in afore-mentioned experiments (diametical 3mm) average every price is 40 dollars, jump in diameter the value is 0.

148 aperture can be machined when 002mm, namely finished cost is every aperture 0.

27 dollars. Accordingly, manufacturer is willing to accept 0.

The diameter of 0127mm jumps value, was equivalent to abandoning will be being gotten cut cost to reduce the chance of 66% . Big clear and machine of essence of life still experiment through similar cutting (cutting condition sees a table 2) , hard alloy establishs the 4 blade that will decide 10mm of a diameter the milling length of milling cutter. Jump when diameter value from 0.

015mm is reduced 0.

When 002mm, length of cutting tool milling increases 211m from 161m, namely cutting tool life was lengthened 30% . The reason is very clear, jump to be only when diameter 0.

When 002mm, cutting force distributings to go up in every cutting blade equably; Conversely, jump when diameter for 0.

When 015mm, too great cutting power will action is in mere on blade of a cutting. Lesser diameter jumps conduce to make of every cutting blade cut deep keep stable, the appearance with be obtained better is bright and clean degree. Express material of test specimen of condition of 2 milling experiment: Speed of cutting of 1055 steel surface: Rotate speed of 90m/min main shaft: 2, 900r/min feed leads: 0.

Speed of feed of 1mm/ every blade: 1, 180mm/min axial cuts deep: 15mm radial condition is chief: 0.

The diameter that 1mm should allow certainly according to the different diameter of cutting tool jumps the error is worth (TIR) . Cutting tool diameter and diameter jump the function that the relation between the value is the bear that cut bits. This data 0.

0127mm serves as a diameter 12.

7mm cutting tool allows diameter to jump the error is worth (TIR) start, can calculate those who give the cutting tool with smaller diameter to reach its to cut bits bear correspondence to allow TIR to be worth accordingly. For example, if use a diameter 1.

The 3 blade of 588mm establish milling cutter to undertake figuration milling to mould steel, its cut bits negative charge effectively for 0.

005mm/ every blade, this is meant, jump when diameter the value is 0.

When 0127mm, cutting tool will overbalance. Be in old old past the appointed time or already on main shaft of tatty machine tool, even if the bedspring collet with best quality also develops good performance hard. Job shops should undertake detecting to machine tool main shaft regularly, with discovering potential problem in time, can shorten treatment assists time, reduce the maintenance to main shaft. Detect diameter jumps a kind of of the error commonly used simple method is the straight measuring staff that expresses with accurate lever lean in main shaft on circumferential face, next slow and rotational main shaft, the diameter that the quantity of the biggest change of the indication that measure a watch gives priority to an axis namely jumps error. Dynamic diameter jumps measurement unit is very useful to high speed treatment. When main shaft low speed rotates, centrifugal force jumps to do not have an influence almost to diameter or affect minimum. But, increase as main shaft rotate speed, centrifugal force also is met with exponential progression twice increases, cause huge diameter possibly to jump error. Typical dynamic way jumps measurement unit has a precise spot, can undertake to cutting tool on X axis and Y axis laser alignment nicety is measured. Big clear and opportunity of essence of life are a few righter recently the test of high speed main shaft makes clear, although a lot of machine tools are in when the low rotate speed of 500r/min precision is very tall, but in 30, the diameter when the high rotate speed of 000r/min jumps the error exceeded 0.

025mm. If job shops hopes to improve cutting tool life, so the diameter that a lot of workshops think to be able to be accepted jumps the error is not acceptability actually. What will buy cutting tool collet is decision-making and mere build the manufacturer on product value basis, final likelihood needs a basis cutting tool life and every aperture () finished cost, select the price the cutting tool collet with taller, better quality. Link: Controallable a few characteristics that the job shops that the bedspring collet that cutting tool diameter jumps hopes to control diameter to jump should pay close attention to cutting tool collet closely, if cone angle of awl surface contact, collet and corresponding clip hold range. In the pinchcock head system in a model, collet cone angle is 16 ° , clip holds limits to be 1mm. But, obtaining this one clip to support the price of limits was to reduce diameter to jump control and clip hold power. For example, the collet of bedspring of BIG Mega New Baby of big clear and machine of essence of life used the collet cone angle of 12 ° , corresponding clip holds limits to be only 0.

5mm, but as older as cone angle collet photograph is compared, it has better way to jump control and clip hold power. The collet of bedspring of BIG Mega E of another kind of product of this company is held with Yu Ga establish milling cutter, its collet cone angle is 8 ° only, because this has bigger clip to hold force, better tigidity and smaller way to jump, can realize stable high speed milling. The collet of bedspring of BIG Mega Micro that holds miniature cutting tool with Yu Ga also used lesser collet cone angle, jump to control way, the diametical norms increment of this series collet is 0.

1mm. Those who raise clip to hold cutting tool is homocentric the diameter that spend and increases clip to hold force to also can reduce cutting tool jumps. For example, the clip of head system holds pinchcock of class of the Mega ER Grip of big clear and machine of essence of life AA diametical dimension is 2 ～ 3mm respectively (dimension increment 0.

1mm) , 3 ～ 6mm (dimension increment 0.

25mm) with 6 ～ 20mm (dimension increment 0.

5mm) . The clip with this kind of lesser collet holds limits to make its and cutting tool petiole are had better homocentric degree, reduced diameter to jump thereby. This collet body increased the osculatory length of inner cone face, what reduced collet thereby is dangerous extend length; Compare with similar product photograph, its clip holds range lesser also. The stiffness that these characteristics raised collet, clip holds force and diameter to jump precision. The collet body course of this system is balanced beforehand, around outside circumferential distributing have a few taper hole, can adjust accurately through bolt evenly; And it used double contact interface. Big clear and machine of essence of life assure, its are all the diameter of model bedspring collet jumps the error is not more than 3µm in place of diameter of 4 times cutting tool, in collet upright ministry is not more than 1µm. Use example: Jump to control way, need to change sometimes cutting tool collet. For example, company of Ideal Tool of manufacturer of a die of American is in when the punch mould of steel of the qualitative to material tool that it is S7 undertakes hard milling, diameter jumps achieve 0.

025 ～ 0.

038mm. After this company is changing the collet of bedspring of HSK-A63 Mega New Baby that uses big clear and machine of essence of life, diameter jumps fall to 0.

0127mm. Ideal Tool company uses machining center of Makino V55 vertical (HSK-A63 main shaft) , with 20, the feed of the rotate speed of 000r/min and 3810mm/min undertakes machining. Like most mould job shops, this company also is with much breed, small lot treatment is given priority to, the need when treatment changes in great quantities tool. After using new collet, change the time of collet is shortened 10 minutes by the 5 ～ in the past 30 seconds less than. Because machine the need when every mould is most,change 10 times collet, because this pair improves the function of productivity,be clearly. CNC Milling