The ball head that is based on four-axle CNC machine tool stands milling cutter to carry blade to grind plan again

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  • source:MARSTEN CNC Machining
1 foreword is in the procedure that establishs milling cutter cutting to machine spare parts of three-dimensional curved surface with ball head, the Duan Ren that ball head stands milling cutter arises easily wear away. Ball head stands appearance of geometry of milling cutter surface complex, the sword that its carry sword is ground normally need is importing grinding machine of tool of numerical control of 5 axes linkage aspirant travel, because machine tool price is high, the heavy wear that causes ball head to establish milling cutter to carry sword this very tall, what accordingly many cutting tool users use manual means to undertake ball head stands milling cutter to carry sword is heavy grind, long grind efficiency and cutting tool precision to assure hard, even some ball heads stand milling cutter to be able to be made only one-time use, create very big waste. To seek more the ball head with practical economy stands milling cutter Duan Ren to repair grind a method, the author puts forward to reduce linkage what come true to establish milling cutter to ball head on machine tool of four-axle linkage numerical control is number of axle, new long grind. Use this kind of method, can reduce finished cost already, reduce cutting tool waste, can improve treatment again precision and long grind efficiency, return the effect that can produce existing machine tool better. Graph axis of the Z when 1 kibble drops of axis of the Z when the computational kibble of main parameter when 2 end blade grinds high sketch map again drop after head of high H ball stands milling cutter Duan Ren to wear away, according to the graph 1 notifies coordinate department, spherical should grind certain height along the blade below Z axial, what just can realize the correct curve that carry sword is new long grind. Graph 1 in R establishs milling cutter radius for ball head, d establishs milling cutter to carry blade flank wear extent for ball head, h is down the height that blade grinds along Z axis to answer, o is heart of the ball before kibble, o is heart of the ball after kibble. When the flank that carry sword wears away: By the graph 1 knowable OA2 =R2-h2OA=R-d has R2-h2=R2-2Rd+d2 namely H= (1) type (1) shows when head of milling cutter ball flank wears away after D, the height that direction of axis of the Z when kibble should drop is. Wear away when ministry of ball the top of head when H height, will spherical be down blade to grind H height directly can. When when Duan Ren the ball supports and wearing away between two side, can consult the circumstance when flank of ball head edge wears away undertakes repairing grinding. Graph when 2 kibble before the Zhou Ren that the computation of Q of angle of deflexion of face of the knife before the Duan Ren when kibble of sketch map of horn of knife face deflexion establishs milling cutter as a result of ball head is corkscrewed yarn, below axial of spherical edge Z blade grinds certain height H while, knife face is in before deflexion of XOY flat a plant an angle Q, concern in order to assure helix blade and the correct position that carry sword (2) seeing a picture. The equation of parameter of week blade corkscrewed yarn that columnar ball head stands milling cutter is the R in type of X=Rcosq (2) Y=Rsinq Z= Pz Q 2p -- the radius Pz that corkscrewed yarn is in columnar face -- Q of corkscrewed yarn lead -- ginseng variable is in graph 1, it is medium that the graph shows coordinate 2 times, have H=z, type (1) era enters type (2) in Z parameter equation, the W of week tine helix angle that gets Q= 2p Pz(3) to establish section of milling cutter cylinder because of ball head again has generation of Tanw= Pz 2pR to enter type (3) , criterion Q= Rtanw(4) or Q= H Rtanw(5) by type (4) , type (5) is knowable, when ball head stands milling cutter to grind treatment again, if Duan Ren is down blade to grind certain height H, deflexion of need of face of the knife before Duan Ren is corresponding angle Q=h/(Rtanw) ; Or when the wear extent of the flank that carry sword that establishs milling cutter when ball head is D, deflexion of need of face of the knife before Duan Ren is corresponding angle Q=/(Rtanw) . Graph diagram of machining center of vertical of 3 four-axle linkage the head stands the 3 balls that are based on four-axle CNC treatment milling cutter Duan Ren grinds machining center of vertical of plan four-axle linkage to be able to achieve linkage of four-axle of X, Y, Z, A again: Direction of X, Y makes horizontal motion; Cutting tool is held through knife handle clip go up in machine tool main shaft, main shaft drives cutting tool to rotate, can make on, next motion form Z axis; Rotate workbench circles X axis to rotate form A axis (if pursue,3 are shown) . In the blade on machining center of four-axle linkage vertical the head that grind a ball stands milling cutter when, because rotate Z of runner shaft of axial A emery wheel coming back is perpendicular, make grinding craft gets very big limitation. To solve this problem, the ball head that can carry pair of four-axle CNC grinding to machine stands what milling cutter carries sword to build a model, the coordinate system that establishs ball head milling cutter to carry blade model undertakes changing, make the coordinate system of its and machining center of four-axle linkage vertical relative should. When grinding is machined, emery wheel installation is on main shaft, will wait for the ball head that worries again to establish milling cutter to hold clip through clamping apparatus rotating on workbench, make ball head stands milling cutter axes and deflexion of Z of emery wheel axes one angle A, make face of the knife before milling cutter and YOZ plane parallel, the center that makes ball head stands center of head of milling cutter ball and circle of the curve that carry sword at the same time in all line and the coincide of axis of rotation with A axis, can realize the whirligig of X axis. Graph sketch map of grinding of face of the knife before 4 balls head stands milling cutter pursues the grinding of face of the knife before sketch map of face of the knife after 5 grinding carries sword pursues sketch map of grinding of face of the 4 knives before the head that it is a ball stands milling cutter. Knife face can use the cylinder that makes the same score molding sand annulus to undertake grinding before, need exercise of a horn at the same time. Because line of knife bottom land is a flat curve, the contrail taking a knife of emery wheel but bottom line of cover of the knife before the basis uses software of existing CAM maths tool to seek solution. The grinding of face of the knife after Duan Ren pursues sketch map of grinding of face of the 5 knives after the head that it is a ball stands milling cutter. Use the grinding of face of the knife after monocline edge emery wheel undertakes, use emery wheel bevel edge (cone) undertake grinding. Because edge curve is round one part, after establishing milling cutter radius to decide when ball head so, should establish heart of milling cutter ball to be start with ball head, be apart from X=Rsina certainly in X direction deflection, y direction with rotating workbench axes is a center, it is radius with Rcosa, use motion of a horn to undertake grinding is machined gyral directly. 4 epilogue discuss according to above, when face of the knife after face of the knife before using the head of cylinder grinding ball that makes the same score molding sand annulus to establish milling cutter to carry sword or the cone that use monocline edge emery wheel grind snick head to establish milling cutter to carry sword, through a horn motion is participated in, what can come true to establish milling cutter to carry sword to ball head on machining center of four-axle linkage vertical is new long grind. Use this method, can reduce number of axle of machine tool linkage, raise utilization rate of four-axle linkage machine tool, reduce ball head to establish milling cutter to grind finished cost again significantly, rise long grind precision and long grind efficiency. CNC Milling