Close means of knife of advance and retreat of whorl of two-way return trip is discussed

Some screw that my unit produces problem origin kind the spare parts is the crucial component in aviation product main transfer machinery, this hardware data is 2Cr13 stainless steel, outside the spare parts cylinder has two the head and the tail apparently conterminous, left and right sides comes back each one helix chamfer (see a picture 1) . Its have in the technical difficulty in treatment: The chamfer of or so helix of ① this spare parts is round outside the spare parts middle, the terminus of dextral helix chamfer is the start of chamfer of Zun Xuan helix, the terminus of chamfer of left helix coming back is the start of dextral helix chamfer, two helix chamfer end to end, do not have the feed, space that retreat a knife completely, if treatment method is improper, whorl of inevitable meeting attaint two end. The molar of or so helix of ② this spare parts all be echelon, the meeting when treatment makes cutting tool wears away faster, the tooth of chamfer of left dextral helix angle should rely on point of view of cutting tool side to assure, cutting tool of bad also control is perpendicular when and be in installing cutting tool at be being machined spare parts, all easy cause helix molar model incorrect. Graph sketch map of substance of 1 spare parts 2.

Treatment means contrast and the G32 that carry out FANUC system and the G33 of Ximen subsystem are onefold whorl cutting to dictate, need many block ability to finish whorl cutting to circulate, and every time feed retreats a knife to need alone process designing, measure is various, the trouble is compared when using. But to cutting of a few special whorl, just showed the advantageous location of its cutting characteristic, and use the circular statement such as G92, G76, cannot machine a satisfactory result however. The chamfer of or so helix of this spare parts is round outside the spare parts middle, the terminus of dextral helix chamfer is the start of chamfer of Zun Xuan helix, the terminus of chamfer of left helix coming back is the start of dextral helix chamfer, end to end, the feed of the need when machining whorl without numerical control lathe is apart from and retreat a knife to be apart from, if use whorl to secure a loop, cannot make sure this kind of spare parts machines quality, with afore-mentioned screw cutting the instruction contrasts, choose Xi Menzi now systematic G33 belt is constant the cutting whorl instruction of pitch machines this whorl. (1) means of knife of advance and retreat and course taking a knife (see a picture 2) . Use the method of whorl of G33 turning awl above all, from A dot turning is nodded to B, need not answer a knife, use the methodological turning of G33 turning straight whorl to C dot directly again, need not answer a knife, turn over direction to return directly, with G33 turning the methodological turning of straight whorl is nodded to D, still need not answer a knife, with G33 turning the methodological turning of straight whorl is nodded to E, the method of the turning awl whorl of reoccupy G33 nods turning to F from E, return A to nod quickly next, execute below one paragraph of order. A, B (awl whorl cutting) , b, C (straight whorl cutting) , c, D (straight whorl cutting) , d, E (straight whorl cutting) , e, F (awl whorl cutting) , f, A (sudden shift) . The terminal coordinate of axis of X of cutting of every time whorl is the start coordinate of axis of X of next whorl cutting, the coordinate of the X axis that F nods is the coordinate of the X way that returns point of safes. The coordinate of the X axis that the terminal coordinate of final whorl nods by B is controlled. Graph when 2 route chart taking a knife machine this spare parts, choose grand program to plan to be machined legally, drafting whorl of legal treatment abnormity is to pass the start position that changes cutting tool ceaselessly to undertake to whorl the knife is machined driving, pointwise approachs actual whorl outline. The specific train of thought that its weave is: It is variable with tooth depth, control radial feed, determine the flute profile breadth that corresponding radius is in through computation, it is axial feed variable with facewidth parameter, subtract with cutting blade width feed increment controls axial feed for axial feed increment. (2) work out machine program: M3 S500 (main shaft rotates 500r/min) T1 D1 (a cutting tool a knife fills) M8 (open cutting fluid) R1=3.

5 (set parameter tooth is tall 3.

5mm) R2=8.

13 (angle 8.

13 ° ) R3=17 (tooth bottom diameter) AA:R4=R1*TAN(R2) (the dimension that drive a knife is calculated) R5=R3+2*R1 (feed dimension is calculated) G0 X30 Z10 (locate quickly) G33 X=R5 Z-50K22 (awl whorl feed) G33 Z-200 K22 (process dextral corkscrewed yarn) G33 Z-20 K22 (process Zun Xuan corkscrewed yarn) G33 Z-100 K22 (nod what stay when awl whorl feed high turning is dropped.

5 (tooth side towards the left drives a knife) G33 X=R5 Z-50K22 (awl whorl feed) G33 Z-200 K22 (process dextral corkscrewed yarn) G33 Z-20 K22 (process Zun Xuan corkscrewed yarn) G33 Z-100 K22 (drop the high point turning that awl leaves when whorl feed) G33 X30 Z-150 K22 (awl whorl retreats a knife.

5 (tooth side drives a knife right) G33 X=R5 Z-50 K22 (awl whorl feed) G33 Z-200 K22 (process dextral corkscrewed yarn) G33 Z-20 K22 (process Zun Xuan corkscrewed yarn) G33 Z-100 K22 (drop the high point turning that awl leaves when whorl feed) G33 X30 Z-150 K22 (awl whorl retreats a knife.

1 (every feed deepness) IF (R1<=0) GOTOF BB (the condition is judged) GOTOB AA (termless return AA block) BB:G0 X100 (return safe place) M30 (the program ends) bibliographical reference: [1] Lu Hongxun, gao Junbo, qin Lei.

Teaching material of concentration of CNC Machining technology [M] .

Luoyang: In press of academy of empty missile of boat industry sky, 2009.

[2] Zhao Yugang, song Xianchun.

Numerical control technology [M] .

Beijing: Machinist trade publishing house, 2011.

Unit: Plane of boat industry Zhengzhou equips in finite author: Fan Cunhui Shang Wenke arms CNC Milling CNC Machining