Summary: Introduced iron of tornado of the whorl inside large nicety to cut the technique of treatment and process designing, this method basically is aimed at material qualitative hardness the large nicety with more number of tall, opening is nonstandard inside the treatment of whorl. Practice makes clear, efficiency of this method treatment is tall, and the precision that can control whorl strictly. The thread machining with 1 traditional preface basically uses turning of whorl lathe tool whorl or use handiwork of tap, front tooth tap and set buckle wait for a method. As the development of CNC Machining technology, especially the occurrence of technology of CNC Machining of 3 axes linkage, make more advanced thread machining means, the numerical control milling of whorl is able to come true. Whorl milling treatment basically uses numerical control to bump, mill kind machine tool or machining center. To the whorl inside small diameter (≤ 20mm) commonly used tap, set buckle wait for a method to machine; tall to material qualitative hardness, Kong Shu's more large nicety is nonstandard inside the treatment of whorl, with these conventional treatment square law compares difficulty. Milling of tornado of the whorl inside Ingersoll's NC-120 machines a method, solved the treatment problem of the whorl inside the large nicety that machines hard with traditional method well. It can be controlled strictly in diameter public errand, when reduce or eliminating cutting tool cutting, be opposite tooth interference, rose to be machined greatly the precision of whorl, and machine effect lead tall. The article basically introduces the treatment technique of tornado milling and process designing. 2 treatment principle and principle of treatment technique treatment and contrail are in mill of numerical control boring kind the treatment on the machine tool is large inside whorl, can use tornado milling, do its machine a principle to be: ? of Dong exorcise some still Lai of of cochlea Che Ding colour of of Piao cut down merchant flatter of τ of hole of Xi of fall forward of billabong peptide calumnying Yan censures krypton of of young thorn sends to protect Cuo of word of of ping ぜ of poisonous sip well ° of?0 of alarm of of of large of thighing Dang , cut whorl chamfer on workpiece hole wall. Helix campaign comes true by the helix interpolation function of numerical control machine tool. Arrive to prevent to machine when hole bottom ministry, the interference block that cuts bits and cutting tool is squeezed and treatment place is cut bits cover, tornado milling all uses what machine outwards from hole bottom to take knife way. Graph when adding the tornado milling that has thread inside, cutting tool of the thread tool inside 1 milling is mixed is the bit that uses NC-120 device to go up, bit body and arbor, its orgnaization is shown 1 times like the graph. Design made a special extension bar, join NC-120 arbor is mixed in front bit body, the awl handle from the back and machine tool main shaft join (graph 1) . This razor blade is but not dislocation, heavy worry hard alloy bit, its dimension and angle precision are taller, can hold Yu Xi bit body, install 4 ～ at the same time 6 razor blade, form bit body of much blade mill. The centering column that carries bit body rear and whorl and arbor bind, pass the short awl of arbor rear, key and bolt again, close solid is on the special arbor that can load taper hole. This cutting tool has the bit that participates in cutting at the same time much, precision performance of tall, wear-resisting is good wait for an advantage. Receive main shaft one after another continuously as a result of cutting tool, when choosing bit body, basically be the depth of the size that considers to machine pitch and screw, screw diameter is not the main factor of the consideration. The cutting tool that mill whorl uses also can be designed by oneself, but the demand that its create precision to want to satisfy the job. To assure precision of dimension of its tooth outline and exterior surface roughness, use much blade structure as far as possible. Graph 2 inside if the tooth of the whorl inside the computation of concerned parameter of size of whorl tooth shape and whorl of point of a knife dimension and knife dot pursue show 2 times. Its set in whorl standard tooth be height of H/8 of expurgation of isosceles triangle aiguille, regard whorl nominal as the diameter with here. Graph 2 in the demand that reflects whorl to cooperate clearance. In numerical control milling, pursue to make 2 in the dot B coincide in A of shows point of a knife and tooth dimension, must calculate those who give screw D1 of the biggest diameter. Its calculate as follows: In type of D1=d+2 × H/8=d+H/4, h=0. 866P, p is pitch, diameter public errand presses the 1/3 consideration that its public errand is worth in, criterion D1 diameter still will increase: In D1=d+H/4+e/3 type, e is in value of diameter public errand. 3 to program with Xi Menzi 8 systems are exemple, introduce the staff of program of its numerical control. Write with subprogram form. Substitute the number in the statement and numerical value with R parameter, can apply to the thread machining of different diameter, different pitch, different deepness, have certain versatility. The program is written by contrail of cutting tool center, do not need to use knife filling function so. The program can stock a machine tool, when using, be called by the main program and give out cutting dosage, initiative parameter assigns, make fixed position of cutting tool center already was machining good bottom outlet upper part at the same time. Graph 3 inside the definition of plan of whorl milling job and the initiative assignment parameter that parameter defines a program and contrail pursue 3 be inside contrail of program of whorl tornado milling and parameter definition: RO1, diameter of treatment whorl nominal; R03, diameter of point of a knife of special mill bit body (SK) ; R05, the deepness that machines whorl; R06, the tolerancepublic errand value of screw center diameter; R08, whorl milling takes knife rate; R09, pitch; R11, number of cutting tool axis (X axis, 111=1; Y axis, 111=2; Z axis, r11=3) . On XY plane inside the program block diagram that block diagram of whorl milling program takes milling of the whorl inside travel on XY plane shows 4 times like the graph: Graph 4 programs flow chart on XY plane inside whorl milling program to numerical control boring, mill kind machine tool (machining center) for, the work out of whorl milling machine program basically uses statement of interpolation of circular arc of G02, GO3, form helix interpolation campaign. The subprogram sheet that system of Xi Menzi 8M uses is below: N1 R1O 0.
Cutting tool of R51 R00 0 R05 R54;N8 G64 G91 G01 Z-R05 FR08 M03; of × of RO9 R00 0 R30/R32;N3 R01 R30 R00 0 R06/R51;N4 R01 R06 R00 0 R01-R01;N5 R01/R52 R00 0 R02 R01;N6 R02/R52 R00 0 R54 R01;N7 R54 of × of 8S6 R12 4 R50 0;R52 2 R53 R02 0R54 0N2 R30 enters circular arc of hole bottom N9 G03 X-R01 Y0 PR2; to be cut when buckling N11 R50 R09; to already machined length to increase N12 @02-10 R5 R50; of a pitch to judge R05>R50 to milling of interpolation of helix of N10 G03 X0 Y0 IR01 J0 ZR9; of the biggest external diameter, n10 jumps before paragraph when R50 of ≤ of N13 G00 XR01 M05;R05, program of end of subprogram of N14 G90 G60 M17; of center of aperture of cutting tool fall back on is designed by the whorl inside treatment dextrorotation, also can write the general parameter subprogram of the whorl inside Zun Xuan by same method. 4 conclusions machine the whorl inside large nicety with tornado milling law, public errand of the diameter in can strict control, treatment precision is good, efficiency is tall. Because used subprogram technology, process designing is relatively handy. And the whorl to different type, the parameter in needing to modify a program only can, the program is insurable in be being put at numerical control system, add man-hour v, agree with batch production. We go up for machine tool of XK713 numerical control in model those who used tornado milling to machine M200 is large inside whorl, the result makes clear, with this method treatment, manufacturing efficiency rose than be being machined with traditional method 40% , and control its easily to machine precision. CNC Milling
CNC Machining