Numerical control walks along the process designing of silk thread cut quickly

Numerical control takes the basic technology issue in silk thread cut quickly (1) workpiece coordinate is fastened and the setting 1) of workpiece origin is in of machine tool workbench different locally, can install a few workpiece at the same time, need builds department of coordinate of a few workpiece. 2) machine tool offers department of 6 workpiece coordinate commonly, undertake designation with G54 ～ G59. 3) workpiece origin should choose to facilitate the place that measure or meets silk, want to facilitate process designing is calculated at the same time. B) of A) treatment punch machines sunken model to pursue a radius compensates sketch map (the parameter of choice 1) craft of 2) craft parameter: It is to point to treatment condition, include: Discharge pulse frequency and arteries and veins the parameter such as clearance of the size of wide, electric current, discharge, silk of precision of ply of these parameter and workpiece material and condition of its heat treatment, workpiece, treatment, electrode (molybdenum silk) the diameter relevant. Machine tool of cut of line of 2) numerical control offers craft parameter database commonly, call for machine program. What database of 3) craft parameter can press cut material and ply is different undertake modification. (3) chooses correctly to wear line of filar aperture, feed and 1) of the line that retreat a knife to wear filar aperture is before undertaking line cut is machined, use other treatment method (if bore, electric spark is perforative) the craft aperture that machines on workpiece. 2) wears filar aperture is the start that molybdenum silk moves at workpiece relatively, also be the position of rest that the program carries out at the same time. 3) wears the position of filar aperture: Should choose searching easily, the place that and facilitate in machining a process checks. 4) wears the position of filar aperture to should be set on workpiece. 5) feed line and the choice of the line that retreat a knife should notice as much. (Compensatory of 4) silk radius builds 1) radius to compensate the computational method of the value: Radius compensates a value==Molybdenum silk radius + discharge clearance namely: Radius of D = silk + δ (δ is discharge clearance) process of the compensation in compensatory of 2) silk radius is built and cancelling to be machined with numerical control milling is identical. Compensatory of 3) silk radius is built and cancel to must use statement of G01 linear interpolation, and must cutting a course (feed line) and cut a course (the line that retreat a knife) in finish, if pursue,2 are shown. Graph 2 radius compensate (of G41) build and cancel (1) of condition of 5) taper treatment must input following parameter above all: The distance of center of the guide pulley on ① to workbench face S. The distance W that ② job mesa reachs next guide pulley centers. H of ③ workpiece ply. If pursue,3 are shown. Graph taper of 2) of parameter of condition of 3 taper treatment machines build and quit a plan of size range of pipe bent of 4 taper cut and treatment of taper of ① of example of machining error analysis if pursue,exit a process show 4 times: Build taper to machine (G51 or G52) , exit taper to machine (G50) ② block must be block of G01 linear interpolation, mix in feed line respectively finish in the line that retreat a knife. ③ is shown like graph 5a place. The sequence range in the graph leaves the outside to wait for those who process work, with workbench face coincide. ④ taper machines building is from what build taper to machine linear interpolation block initial drop begins to slant place electrode silk, slant to silk of the electrode when the terminus of this block place designation taper value, if pursue,A place is shown. ⑤ taper machines exiting is from what exit taper to machine linear interpolation block initial drop begins to slant place electrode silk, place 0 ° to be worth to silk of the electrode when the terminus of this block (verticality) , if pursue,B place is shown. Graph 5 taper machine build and exit size range of pipe bent of 3) taper cut and machining error to analyse size range of pipe bent of ① taper cut: 6 ° of ± / the size range of pipe bent of cut of machine tool taper with different 50mm(is general not identical) . This value agrees with only outline is smooth connective graph. Graph of not smooth to outline connective, because arris edge cone angle is,intersect double is compound horn, its are worth the cone angle that is more than a face to go up, when the cone angle that goes up face to face accordingly is 6o, the cone angle on arris will be more than 6 ° , cannot cut. For example, when cut taper is the square pyramid of 6 ° , the cone angle on arris is 8.

792 ° , already exceeded ± the cut limits of 6 ° , accordingly cannot cut. If pursue,6 are shown. Machining error of ② taper cut. A.

Taking machine tool of silk thread cut quickly is the molybdenum silk that with guide pulley the high speed that prop up runs, when undertaking taper is machined, its prop up point of tangency to be able to have minor change as the formation of taper. Accordingly, inevitably meeting brings cut error. The error that the change of point of tangency of A)U direction brings. Silk of B)V direction molybdenum slants when placing, molybdenum silk suffers slant place tensile effect, have the tendency of slippage of edge guide pulley. Graph B of machining error of 6 taper cut.

As the shift of U axis, molybdenum silk suffers slant place tensile effect, different slippage current can generate inside guide pulley chamfer, and the V direction error with different generation; This one error makes mensurable calculation not easily, can make qualitative analysis only. C.

Taking error of filar taper cut quickly is inevitably cause by change of guide pulley point of tangency. Because this is when taper cut, to raise cut precision, can edge crest line feed of 45 ° direction, or be lay work some point of view, the error that forms in order to make guide pulley point of tangency changes offsets each other on dimension direction. CNC Milling