Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Tool Holders/,刀夹系统,In the system of spindle+tool holder+cutting tool,the tool holder is the link that has the most effect on overall concentricity and balance.Dont think of it as commodity hardware.As spindle speed increases,the choice of tool holder has more impact on process effectiveness,在主轴,+,刀柄,+,刀具这样的一个系统中，刀柄是影响同心度和动平衡一个关键环节，千万不能将它当成一般的部件来看待。随着主轴转速的增加，刀柄的选择对于加工的影响将显得越来越重要。,Two Face Contact&HSK holders/,两面接触,HSK,刀柄,Centrifugal force from fast spindle speeds can cause the tool holder to retract when the spindle and holder touch only along the taper.,Two-face contact at the spindle interface can solve this problem.HSK is a widely used tool holder design that features two-face contact,对于仅仅是锥度连接的刀夹系统来说，当主轴在高速旋转的情况下，因为主轴本身锥孔的膨胀，而主轴和刀柄的连接又仅仅是通过锥度面连接，此时刀柄受到拉力的影响会有一个回缩。,两面接触的连接方式有助于解决该问题。,HSK,即是被广泛使用的一种两面接触的刀夹系统。,Two Face Contact Holders/,两面接触刀柄,Common tool holders leave a gap between the flange and spindle nose.Some tool holder systems close this gap to achieve two-face contact with a conventional taper,Two such systems are shown.Both designs combine special tool holders with a special or modified spindle interface.Both designs leave intact the freedom to use regular tool holders when two-face contact isnt needed,The design at upper right mates tool holders that have extra material on the flange with a spindle interface that has extra material at the spindle nose,The design at lower right uses a tool holder with a spring-like taper that stays in contact even if the spindle interface opens up.Shims attached to the spindle nose close the gap to the flange,普通的刀柄连接在主轴法兰面留有一个间隙。有一些的刀柄采取封闭这段间隙的方法来达到两面接触的目的；,该种设计如图所示。这两种连接都需要有特殊的主轴端面设计，在需不需要两面接触会有一定的选择自由；,如右上图所示。在刀柄与主轴紧密配合时会因为变形在主轴法兰连接面之间产生材料的挤压；,如右下图所示。使用带弹性锥面接触的刀柄。其中的垫片可以封闭主轴法兰的间隙。,Concentricity&Balance/,同心度和动平衡,Concentricity(Runout)determines that the cutting edges take nearly the same bite all the way around the tool.,Balance determines that weight is evenly distributed,so centrifugal force does not create enough vibration to impair the process.,Both are important for HSM,同心度可以决定刀具在旋转一周的情况下各切刃部分的切削量是否均匀；,动平衡取决于旋转体上质量的分布是否均匀对称。各个方向离心力均衡，不至于产生震动减弱刀具加工能力；,以上两者对于高速加工都是很重要的因素。,Concentricity/,同心度,Concentricity,measures how closely the tool holder aligns the tool to the centerline of the spindle.,A concentric grip helps ensure that all cutting edges see the same depth of cut,.,同心度测量如右图，通过调整刀夹的中心轴线与主轴的中心轴线重合来调整痛心度。,好的同心度控制可以确保所有切削刃在各个方向上有均匀的加工量,Balance/,动平衡,Balance,measures the distribution of weight of the tool and tool holder together.A perfectly balanced tool/tool holder combination would not generate any centrifugal force as it spins.But in reality,some part of this combined weight will be unbalanced,.,The unbalance will produce,a vibration at a frequency equal to the spindle RPM,.If the unbalance amount is small,this vibration will also be small,.,动平衡的测量需要将刀具和刀柄整体进行。在主轴旋转时好的动平衡刀柄和刀具结合不会产生任何的离心力。但是实际上完全的动平衡是不存在的。在主轴旋转时动不平衡将产生周期性的震动。如果动不平衡量很小，那么这种震动也会很微弱。,Balance&Concentricity/,动平衡和同心度,Weight does not have to be symmetrical to reduce centrifugal force,just balanced.An unbalanced weight can be balanced by any counterweight having the same product of,mass radius,.,For example,the weights shown here balance one another.,The masses are different,but where they are positioned makes up for this difference.,旋转体上质量并不一定要均匀分布才能减小离心力，只要平衡就可以了。一个不平衡的重量可以被任何的方向相反大小相等的平衡力,(,质量,半径,),抵消。比如左图的一个示例,。,It is possible to imagine a tool/tool holder system that is balanced without being concentric.,In this drawing,the cutting tool is off center,but the counterweight compensates for the resulting unbalance.,This tool and tool holder may not cut evenly,but together they will spin without vibration from centrifugal force.,可以想象同心度不好的刀具刀夹系统也可以有好的动平衡。在图中，刀具中心偏移，但是图中的红色部位可以补偿因此带来的动不平衡量。虽然像这种刀具切削不能进行均匀的切削，但是不会因为动平衡离心力的影响产生震动,。,Balance&Concentricity/,动平衡和同心度,It is also possible for a tool/tool holder system to be concentric but not balanced.,A tool holder with a set screw is an example of this,.Even if the tool holder holds the tool perfectly concentric,the weight of the screw itself would not be balanced.This tool holder will cause vibration when spun.,同样对于同心度好的刀具也可能动平衡不好。如图所示的带紧固螺钉的刀柄。虽然它有很好的同心度，但是它在圆周上的质量分部不均匀，因此在高速旋转时会产生震动,。,Balance&Concentricity/,动平衡和同心度,Holders for Good Concentricity/,优良同心度,Though a high quality Collet Chuck can achieve tight concentricity,there are alternatives to the Collet Chucks that can make this concentricity easier to achieve.,高质量的弹簧夹的适用可以获得好的同心度，但是的刀夹系统也可以获得同样的效果，比如烧结式的刀柄。,Shrink Fit Holders/,热缩型刀柄,1-The tool holder is heated precisely at the clamping area using state-of-the-art induction technology.The clamping diameter expands.,2-The cold tool shank is inserted into the heated tool holder.,3-The heat shrink tool holder is cooled.The clamping diameter returns to its original dimension and clamps the tool shank.,4-Tool changes are carried out in second