System of GNC of personal computer of numerical control lathe studies

0 development come out, use pure Chinese operation, interface straightaway, image is visual, agree with personnel of average project technology is used. The system used the pull-down menu, way that plays menu giving form and toolbar photograph couple to undertake operating, went to the lavatory greatly the use of the user. The hardware of 2 GNC system comprises a whole GNC system to include to complete the gets treatment instruction whole process from information. Manual input (odd content of MDI)NC code program, bother already, as dry as a chip, error rate is high. all of computer science department and device of machine tool numerical control online, can leave out operates this one link artificially, still can be opposite at the same time much stage machine tool has real time or time-sharing is controlled, can deserve to go up so the serial opening that is used at communication and DNC interface. Structure of GNC system hardware is shown 1 times like the graph, construction of system is shown 2 times like the graph. The lines number that the input that the input of information of geometry of 3 spare partses and graph make news of spare parts geometry includes to decide a part, each paragraphs parameter and mutual the join between is characteristic. Of graph of spare parts geometry generating is the pertinent information that shows the system is inputted according to the user the geometrical figure that makes a part automatically on screen. The input user of information of spare parts geometry from left after to spare parts of right ordinal input each paragraphs parameter decides its join is characteristic, the system is begged well and truly piece mutual the nodical coordinate between, and " remember " relevant geometry information (those who be like each paragraphs line feature, circular arc is suitable go against, each paragraphs tangent wait for) . If have,round curve is not in the spare parts (parabola, elliptical) , the system is used " change span approachs a way point-blank " seek a cost of its node coordinate, in putting this value into a group, store rise. After geometrical information input ends, the system can put the data of earning in the file that one user appoints, so that be used when postposition processing. The processing technique of the curve that be not a circle (it is exemple) with ellipse: This system is used " change span approachs a way point-blank " , of this method and tradition " wait for span law " the advantage with clearer than having photograph. Traditional " wait for span law " it is the interval that is in the curve that be not a circle average fractionize is N portion, be about to the place with curvature greater radius also divides into same size according to the place with curvature minor radius child interval. Such reaction arrive on numerical control machine tool is needless take a knife more, efficiency is very low. And change can better land handles span law this one problem. Specific means is shown 3 times like the graph. Graph 3 change the expression that span approachs a law to beg a Y ＝ F(X) according to foregone parameter equation point-blank: (X-Xc)2/R12+(Y-Yc)2/R22=1, will appoint interval Se to be divided into N portion, beg a Xi according to gotten span DX, can beg the Xi generation of earning into Y ＝ F(X) piece a series of (Xi, yi) , it is coordinate of terminus of every line segment namely, be worth with this coordinate or work out of corresponding value of knife heart coordinate is linear block. Calculate nod to P, if discover not contented precision asks, share Pe interval finer, ordinal undertake, ask till all and contented precision till. Law of error check proved recipe is shown 3 times like the graph. The some after MN calculates to try paragraph approach line segment, MN is parallel at MN and give) for D(user to the distance of MN, can get the equation of MN and MN: M N: AX+BY+C ＝ 0 MN: AX+BY=C ± D[(A2+B2)]½ begs Jie Lianli equation, mix when MN (X-Xc)2/R12+(Y-Yc)2/R22=1 is both when having point of intersection, the specification needs again fractionize interval, in order to reduce the cost of DX (the interval that adds a cent namely counts N) , until both without point of intersection till. The permission of D is worth, take the 1/5 of spare parts public errand or 1/10 commonly, the permission that this system recommends D is worth in 0.

001mm less than. Of graph of spare parts geometry generated VB(Visual Basic) to provide relatively rich draw statement, fall in the condition that knows relevant parameter consequently, make the figure of the spare parts easily. Use directly with circular arc point-blank " Line " and " Circle " command. When encountering the curve that be not a circle, will use change the node that span approachs a law to try a curve that be not a circle point-blank, ordinal rise with linear join, can get approximately is not round curve. When imitate of imitate of 4 CNC Machining is machined, the user needs to hint by the system dot of the knife since dimension of ordinal input semifinished product, machine tool, knife fills parameter of value and cost of compensation of guide screw clearance, cutting (speed of cutting deepness, cutting, feed) , numerical control code is in the information such as the position of machine tool location. The treatment technology that considers lathe is more sophisticated, and the spare parts of turning is Protean, very hard process designing of each fixed means, and include all sorts of cases more as far as possible. The system distributes lathe part two kinds: Axis of a flight of stairs and typical spare parts (the treatment) that basically can solve common form part. Axis of a flight of stairs is point to firm sense to go up from left to right ordinal and degressive type, the treatment information that systematic basis inputs, combine the geometrical information of the spare parts, make treatment course automatically undertake imitate is machined, generate corresponding G/M code automatically. Typical spare parts is to if pursue,point to the metallic form that wants purify 4 shown 5 sort. If typical spare parts, machine a course to need to be defined oneself, select the characteristic kind of rough machining, by the requirement the input is nodded accordingly (in the graph already line out) coordinate value. The input that coordinate is worth should consider surplus of semifinished product dimension, spare parts dimension, finish machining integratedly, the system can provide the information of nodical coordinate in the spare parts. The choice of systematic basis user undertakes imitate is machined orderly, generate corresponding G/M code. Graph the 4 metallic form that want purify 5 sort graph graph of 5 dynamic imitate observes to facilitate, one as similar as photograph of cutting tool appearance 2 thinking are used in dynamic imitate process the graph will replace cutting tool, semifinished product outline and already the color that the part of cutting is gifted to differ, seem to be with small knife really like cutting so, image is clear, if pursue,5 are shown. Of code of 5 numerical control those who generate contrail of the numerical control in machining imitate the process linear or circular arc data, according to treatment course and place control input format demand with the machine tool, build treatment circular arc or linear block. Concrete move is as follows: Be being judged above all is treatment straight line segment or circular arc paragraph, this information already was obtained when information of spare parts geometry is inputted, when treatment straight line segment perhaps is not round music line segment (with approach point-blank) when, output G01 code; If machine circular arc, needing to judge circular arc is suitable hour hand anticlockwise still, output code of G02, G03 respectively. Combine a knife next the information of the dot (X, the coordinate of Z is worth) with cutting parameter, these information union rises ordinal in putting the document that one user appoints, get numerical control code. This system accords with 6 conclusion numerical control is automatic the development trend of process designing, the process designing issue of numerical control lathe can be handled on personal computer, generate G/M code automatically, and the operation is simple, interfacial image is visual, suit personnel of average project technology to use. At present this system already was used on numerical control lathe, have good economic benefits and perspective of effective promotion application. News source: Guo of university of Wuhan auto industry arranges Yang Mingzhong of unripe Zhang Honghua CNC Milling