Lathe tool of arris form figuration machines the appearance error analysis when taper seat workpiece
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source:WILDA CNC Machining
When lathe tool of figuration of the form that use arris processes taper seat work, the horn before whether having because of lathe tool produces hyperbola error with respect to inevitable meeting, put in two kinds of different point of views at present. The first kind of viewpoint thinks, as a result of the horn before lathe tool has, cutting blade is linear model, treatment produces appearance error necessarily as a result; The 2nd kind of viewpoint thinks, want to take corresponding craft step only, won't produce afore-mentioned appearance errors. The article makes one analysis compare with respect to these two kinds of viewpoints. 1. The appearance error of the generation when lathe tool of arris form figuration processes taper seat work the first kind of viewpoint thinks, the profile of workpiece of swing tower figuration (the width that includes profile and deepness) answer to be measured inside the plane that passes its axes by the regulation, and the cut form of figuration lathe tool should be in by the regulation with hind the NN section with knife vertical face (method extent) inside measure. Accordingly, become only of cutting tool before when F of α of the horn after horny γ F is mixed is equal to 0 ° , the profile of the cut form of figuration lathe tool and workpiece ability may be complete conform to, but hind the cutting tool of 0 ° of ＝ of horny α F misfires. When lathe tool of arris form figuration before 0 ° of ＞ of horny γ F, hind when 0 ° of ＞ of horny α F, by graph 1a knowable, the P of cut form deepness on this cutting tool will be less than the corresponding profile deepness Ap on workpiece. Accordingly, when designing lathe tool of arris form figuration, must undertake correction calculation to form of cutting tool cut. If graph 1b place is shown,the plan emerges the analysis of appearance error, lathe tool of arris form figuration as a result of F of γ of the horn before having, MM of face of the knife before making does not pass workpiece axes, namely the cutting blade of cone part is not inside the axial section plane of workpiece. Planar MM and workpiece are conic of the surface hand in a line to show one outside the hyperbola appearance of protruding. Accordingly, if want to cut correct workpiece figure (namely taper seat surface) , must make MM planar the cutting blade appearance inside and corresponding outside protruding hyperbola appearance is completely consistent, it is namely one inside sunken hyperbola. But actually to simplify the design of cutting tool and make, constant this section plane consummate of medium cutting blade appearance is linear, this excises one share data more on workpiece necessarily, produce appearance error thereby, namely hyperbola error. 2. When lathe tool of arris form figuration processes taper seat work, can avoid to produce appearance error the 2nd kind of viewpoint thinks, when lathe tool of figuration of the form that use arris processes taper seat work, if choose,undermentioned square law can avoid to produce appearance error. (1) because law of cone generatrix be identical is in when design and lathe tool of figuration of production arris form, width of form of cutting tool cut and workpiece profile width are equal (fall in a few special situations, allow width of form of lathe tool cut to be more than workpiece profile width) , because this wants to be when installation cutting tool only, make the cutting blade of cutting tool and workpiece circumgyrate axes are inside same horizontal, make cutting blade and be identical of photograph of workpiece cone generatrix, the work that treatment gives won't produce hyperbola error, however standard taper seat. In graph 1b, as long as lathe tool with base point 1 turn round slightly for axes, can make cutting blade and workpiece cone generatrix 12 photographs be identical, keep corresponding before, hind horn, its are shown like graph 2a place as a result (right now the cutting blade of cutting tool is) . Work is processed below this condition, won't produce exterior figure error. (2) radial is installing the horn before waiting, horn after waiting to machine a law to be in when building lathe tool of figuration of the form that grind arris with emery wheel, make grind the cutting blade that go out and parallel of NN of extent of cutter hub method, the angle of face of the knife after making and vertical line of emery wheel surface is (F of α of γ F ＋ ) (2b seeing a picture) . When processing work, if graph 2c place is shown, make the cutting blade of cutting tool and workpiece circumgyrate axes are in same horizontal inside, and with be identical of workpiece cone generatrix, make the horn after cutting tool is α F at the same time. See not hard, nod each on blade of cutting tool cutting before, hind horn is equal, as a result of cutting blade and be identical of workpiece cone generatrix, because this won't produce exterior figure error. The analytic that when 2 figuration lathe tool machines cone, the graph avoids to produce appearance error 3. Analysis and conclusion (1) according to the 2nd kind of viewpoint, the engineering technology of workpiece of taper seat of treatment of lathe tool of arris form figuration is simpler, nonexistent complex academic issue, as long as according to the graph 2 show a method to repair grind and install cutting tool, before lathe tool has horny circumstance falls to also can avoid to produce appearance error. Accordingly but need not undertake complex correction calculation to form of cutting tool cut. (2) although the first kind of viewpoint is on academic derivation,be correct, but the understanding of F of γ of the horn before this kind of viewpoint is right is worth deliberate. Above all, this viewpoint thinks " become only of cutting tool before when F of α of the horn after horny γ F is mixed is equal to 0 ° , form of cut of figuration lathe tool and workpiece profile ability may be complete conform to " , this one judgment lacks real sense. The first, because processing work of one-way taper seat (or the work of double combination face that taper seat and columnar face make) when, the cutting blade width that allows lathe tool is equal to or be more than workpiece profile width, because this wants to make only the cutting blade of lathe tool and be identical of photograph of workpiece cone generatrix can, and need not ask both and complete conform to; The 2nd, the cut form that graph 2a and graph 2c already proved lathe tool (actually namely cutting blade) with workpiece profile whether of conform to and cutting tool before, hind horn has nothing to do. In addition, this viewpoint thinks " lathe tool of arris form figuration as a result of F of γ of the horn before having, MM of face of the knife before making does not pass workpiece axes, ... produced machining error thereby " , the horn before thinking namely is the premise that causes machining error. And the 2nd kind of viewpoint reached however completely opposite conclusion, because press the first kind of point of view,this is, the orientaton of F of γ of the horn before cutting tool is to press treatment is normally cylindrical the method of the horn before deciding when circumgyrate workpiece will decide, the size of F of γ of the horn before choosing namely is in by the regulation perpendicular inside the plane at workpiece circumgyrate axes, and this method comes to the apply mechanically when processing cone work the orientaton of the horn before deciding is not appropriate, this complications those who bring about lathe tool to devise theory, make the workmanship of lathe tool unreasonable thereby, bring about generation finally to process appearance error. When processing conic outside work, lathe tool of arris form figuration is reasonable before horny orientaton should set in perpendicular inside the plane of the cone generatrix that stands by lathe tool a side at be with workpiece circumgyrate axes inside same horizontal (2d seeing a picture) , the 2nd kind of viewpoint accords with this one principle. CNC MillingCNC Machining