Graph 1: Balance and the boring cutter that did not balance machine the circumstance of aperture of diameter of a 50mm in aluminous material. Two cutting tool are in 5, identical circularity error arose below the speed of 000r/min, but break up when speed time when, the error tall 5µm that the cutting tool that did not balance produces, unbalance difference is 40g-mm between two cutting tool, in 10, below the rotate speed of 000r/min, this will bring about centrifugal force respect to differ the cutting of highest public errand that 100 pounds undertake possibly to specific machining center, can use the belt is adjustable the only place boring cutter of cutting diameter. In the meantime, this kind of cutting tool also may be the boy or girl friend that amount of highest and inherent unbalance has when machine tool cutting. This kind of phenomenon increases the consequence with meeting true generation as main shaft speed, the centrifugal force of because of unbalance generation can rise with the square of rotate speed. speed from 4, 000 rise to 8, 000r/min, below the case that has any changes in incorrect cutting tool, can cause centrifugal force to increase fourfold. The rate of will same process rises 12, 000r/min can rise the force of because of unbalance generation to 9 times of primitive speed. Result from sex of this kind of index to rise, a kind once negligible effect may magnify the rate that can no more carry little common difference. Be located in the United States the KPT Kaiser company of the city can offer Yilinuosi boring cutter of alterable diameter nicety. In the past 10 years, increase of top speed greatly as the machining center of all sorts of class, this company rolled out what suit high speed boring more to update edition cutting tool. Have in new version adjustable balance - use movable type the change that balance piece will come to compensate the unbalance place that positional happening changes and arises because of radial of cutting razor blade to cause. But not be circumstance of every boring application - not be every high speed application even - it is these can balance cutting tool await the person that choose. Jack Burley of engineering vice president says, have adjustable the cutting tool of the balance occupies a company to change only 10% of sale of diameter cutting tool. But, cannot balance a cutting tool that has a balance to be able to be in however through movable type cutting tool is adjustable try to balance among diametical limits. Like application of most accurate boring, mere this kind of balance is enough. Understanding brings to bear on to produce what kind of situation to the meeting when sheet nods boring when unbalance is very useful the workshop of narrow to thinking with taller cutting speed is machined opening. In addition, this kind of understanding still falls in more circumstance very useful. The workshop that uses rate of taller main shaft in all sorts of different application circumstances cares the potential effect of unbalance normally. The example of boring of high speed nicety - height asymmetrical cutting tool and very shallow cut deep union to be an organic whole - can provide effective standard for these workshops. The extreme combination of all sorts of conditions can show unbalance produces the rate of the influence to machining a process. A common error in high speed treatment is the issue that considers a balance rarely, and another common error is pair of balance considerations is too much. The high quality cutting tool that the balance that high speed treatment is worth to use basis rigor really asks and makes and knife are placed, but using the occasion that establishs milling cutter and cutting tool of other itself semmetry, pass cutting tool of choice high quality to may ensure with respect to enough only enough balance. Try to pass pair of cutting tool to undertake right now certain leave line adjustment and raise a balance to be able to appear further ruin the effect by adding sth superfluous, can bring about centrifugal force to produce change - it is very tiny that this kind of centrifugal force and the force photograph that cutting produces are compared. Only place boring cutter needs to adjust accurately evenly more, the reason is, more shallow cut be compared greatly with lesser unbalance force photograph and character appears more evident. Graph 2: The knife of accurate door or window frame that shows here is through standing by its adjustable the picture that the diametical setting attune among limits balances 3: Knife of this kind of thick door or window frame uses contrary razor blade to balance cutting force, reduced what arise in cutting process to although,circle music such, the effect of unbalance also should not think to be opposite everybody the sense is great. Go up in the only place cutting tool that can be balanced and cannot balance with 10, the comparison that 000r/min speed undertakes experiments showed about 5µm (see a picture 1) aperture circularity error. A lot of treatment operations can accept the error that can compare with this amount class. But in accurate boring, must consider the error of class of this kind of amount. Boring and rate plan 2 gave out a diameter is adjustable the example of boring cutter of essence of life. Have the aid of its are adjustable quality, a cutting tool can machine the aperture with a large number of different diameters. And as a result of adjustable the gender is very careful, can install through compensating machine tool and machine tool occasional obtain accurate diameter with the difference of respect of the bending between the setting. To have this kind of compensation, be in commonly when some is using cutting tool for the first time in specific process, want to let it take two knives first. The first knife undertakes with owing the diameter of a bit a little. Measure aperture next. Increase cutting tool diameter then, addition amount is the numerical value that place of surplus of material of purify the rest needs. Come with this cutting tool finish machining aperture - the positional precision that has realized qualification beforehand among them, circularity and linearity. In the graph 3 in showed the thick boring tool that is used at setting these parameter. The diameter of this cutting tool is adjustable also, but control without same drop. Machine the aperture that exists beforehand by this cutting tool, the core aperture in such as cast and forging. The circularity of aperture and linearity are based on cutting tool to design - the kind that cutting tool has locating to cutting blade is, the cutting force that allows respective generation each other are opposite. Other does not take this kind of complementary power with the cutting tool at rough machining aperture, and be balanced as a result of lack, this may affect the geometrical figure of aperture. For example, broach can happen wander phenomenon. Establish milling cutter to be in deviate very easily from cutting with what machine at circumferential milling, and cutting tool is jumped over grow, this kind of deviate is bigger. The balance of the force in thick boring cutter overcame these problems. To this cutting tool, using high-speed profit is productivity merely tall. Need not consider the issue of unbalance, because this does not have cutting tool essence of life is cut closely, and be in at restricting unbalance because of the symmetry incline to of cutting tool enough low level, accordingly it won't affect performance. To accurate boring cutter, using high-speed profit is however more. The challenge that unbalance place poses is bigger. High speed is used to be able to improve productivity in boring of essence of life, still can improve aperture quality. PCD of such as of material of high-grade cutting cutting tool, CBN and pottery and porcelain (see a picture 4) , lift as cutting speed, the surface that treatment comes out is slicker. In addition, higher cutting rate is OK and direct the cutting tool cost with lower translate into, because these identical cutting tool are in,taller cutting can realize longer service life below speed. Graph 4: Data of harder than hard alloy cutting cutting tool allows to use higher cutting rate. To these material, increase as speed, cutting tool life and the quality that machine the surface can rise. Achieve the centrifugal power that the obstacle comes from all likelihoods of these advantage to arise at unbalance. What balance action plan shows 2 times is adjustable of diametical cutting tool but balance edition can undertake automatically balancing correction. In cutter hub inside, movable type balances a meeting to have shift as all sorts of change of cutting diameter respect. To cutting tool of stretchy lever type, diametical adjustment is not the exclusive variable that affects unbalance. Still having a serious side is the user choice to stretchy length. To compensate this kind of variable combination, cutting tool uses system of hand dynamic balancing. The dial that passes number by moves in cutter hub inside balance piece orgnaization. The numerical value of dial is based on the chart of tool manufacturer. In this chart, the user can consult the aperture of the tentative idea and hole depth, still have radius of head of knife of cutting razor blade at the same time, in order to decide this proper setting that balances a dial. Besides these elements still other element also can cause unbalance problem. Lengthen lever twists the tight ness rating of solid to also can affect the balance position of cutting tool. The choice of bit also can produce such result, because the weight of razor blade of metal of pottery and porcelain has the in part of razor blade of identical hard alloy only. To adjustable balance cutting tool, the effect that these place produce such as did not undertake compensating. But at that time, the target that balances this cutting tool is not contented and certain narrow narrow balance object. Contrary this target will be the unbalance phenomenon on the point that reduces amid to be able to produce stable cutting, because cutting force is more than centrifugal force far. Nod here beyond, further improvement will not affect the workpiece when cutting tool cutting or size of active force of susceptive of machine tool place apparently. Those who change character, the most important " evenly " , the process improvement quantity that is a likelihood and enough satisfy the improvement that applies a need currently to measure the balance between. Change razor blade intensifies device can increasing cutting diameter, does the power that still increases unbalance to measure our place to talk about at the same time have how old? What KPT Kaiser place sells is adjustable diametical sheet nods boring cutter to only about 10% provide movable type the unbalance that when balance piece will compensate a diameter change, happens. Cutting tool designs all other to be stood by to be in only adjustable the balance of some bit of aspirant travel among diametical limits. More without the sale " can balance " the reason of cutting tool is, although be below high speed, not certain also generation and cutting force photograph compare unbalance enough the high centrifugal power that has main effect. The power that unbalance produces can use this formulary and approximate calculation: F ≌ U X(rpm/20, 000)2 among them F= force, the unit is a pound, u= unbalance is measured, the typical unit of this feature parameter is G-mm. It is OK that KPT Kaiser offers a kind of diameter in 0. 984-1.
The sheet that adjusts inside 299 inches of limits chooses boring tool. Inside this limits, the unbalance with the biggest cutting tool happens in 0.
984 inches of place, unbalance quantity is 30g-mm. According to the formula above, in 10, this cutting tool is used to will arise when 000r/min about 7.
The centrifugal force of 5 pounds. The admiral of total active force that increases level of this kind of change cutting won't affect the most work that processes on machining center, but the success that affects boring of essence of life possibly however is carried out. Device of clamp of change razor blade (see a picture) can this cutting tool touch limits expands 1.
850 inches. The unbalance quantity of this diameter is 70 G-mm. Right now 10, the centrifugal force when 000r/min turns into 17.
5 pounds. But, this will be the application of a kind of adventure. The cutting rate that the combination of rotate speed of this kind of main shaft and diameter will cause cutting speed to amount to workshop of great majority of 4800sfm- far outclass to be used commonly. With cutting of this rotate speed the workshop of this diameter can change a kind of way, the boring cutter of essence of life with the bigger diameter that uses same manufacturer namely - a kind of diameter that will need finds a place for in more the cutting tool that stands by cutting tool to balance position. Conclusion is: Although be in 10, below the rotate speed of 000r/min, also need very tall unbalance to measure ability to arise to have the active force of apparent effect to machining a process. Because boring of essence of life is medium active force is inferior and common difference is narrower, because this may suffer the effect of unbalance phenomenon especially. But, although be in treatment of boring of essence of life, what higher main shaft rotate speed also won't arise automatically to undertake to cutting tool certain mechanical adjusts evenly is necessary. Contrary, "Can balance " cutting tool or suits greatly prep above 10, the speed of 000r/min, or suits will high rotate speed and very tall precision and / or in cutting tool condition of certain and inherent unbalance issues the application that moving cutting tool needs union this kind to be an organic whole. CNC Milling