In CNC Turning online the technology of automatic process designing that measures cutting parameter

Time:2023-06-15 13:55:00
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source:TRIANA CNC Machining

1, all sorts of modern production systems that the overview is core equipment with numerical control machine tool are mixed in machine tool industry in be not machine tool industry, already got applied generally. By the blueprint of treatment spare parts, gave out the geometrical data of CNC Machining and technical data, it is the original basis that NC machine tool works. When machine tool of use numerical control machines a spare parts, must weave beforehand good part machine program is only, stipulated the spare parts machines parameter of quantity of craft course, contrail taking a knife, displacement, cutting in sheet of spare parts machine program (main shaft revolution, feed, cut deep) and auxiliary function (change knife, gearshift, cooling fluid to leave stop wait for) . Numerical control machine tool works automatically by the program that has woven, treatment gives eligible part. The main content of numerical control process designing includes: Analyse part drawing paper, machine process certainly; Computation walks along knife contrail, get knife digit is occupied; Write spare parts machine program, proofread a program to reach first to try cut. The basis concerns statistic, of the process designing time of a spare parts and machine tool handling time than, it is 30:1 on average about. The automatic work out that use computer will come to to implement machine program calls automatic process designing, what article introduction is based on Microstation graph platform is online the automatic process designing that measures the CNC Turning of cutting parameter to measure a process. The seesaw pattern graph that Microstatioin is American Intergraph company to get on its workstation designs a system (the CAD graph system that IGDS) transplants thoroughly to go up to personal computer, the user interface of this graph system is very friendly (use a program with WINDOWS95 similar) , this graph platform has good open sex, the Microstation that offerred 32 process designing with powerful function develops a language -- MDL language () of language of similar standard C. Make the CNC Machining of the workpiece with low precision to semifinished product, if press traditional process designing pattern, must according to process designing of dimension of the oldest semifinished product. Because press process designing of the largest size, a treatment efficiency are inferior, meet again the under certain circumstance builds voidance to cut, and may have caused in additionally one kind of circumstance cut. Cross cut consequence, light affect cutting tool durability, cause collapse knife to damage even again arbor. So, the CNC Machining of the workpiece with semifinished product production big error needs fibrous root occupies the particular case of every workpiece, the cutting parameter that will define this work (wait for) like cutting surplus, frequency taking a knife. The function of cutting tool monitoring of system of this numerical control of SINUMERIK-810T of have the aid of of process designing system, the surplus that uses a few keys that measure a process to obtain a spare parts to go up to nod before outline is machined distributings circumstance, offer the cutting parameter of current work for machine program then. 2, cutting parameter measures process CAPP1) to have the turning that measures a function to measure a graph the framework turning of system of automatic process designing measures a graph system of automatic process designing comprises by two big module: Measure gauge to delimit module is mixed measure program postposition module. Measure program module to complete the program that measures a process with the means of seesaw pattern CAPP among them, the system provided the modification function with powerful function, the user can undertake deleting to the measurement point that already planned, the change is measured order and revise measure the operation such as process technology parameter; Measure program postposition module to be an input in order to measure program data, via postposition processing creates the NC program that measures a process automatically. Graph 1 system advocate the part drawing that accuses a dialog box to measure program CAPP to be built with CAD means is an input, the user plans with interactive means every measurement point, be in at the same time left / right tool carrier measures the input in the dialog box to measure process technology parameter, generate measure process knife reach technical data document. The knife that measures program postposition to arise in order to measure program CAPP process reach technical data file to be an input, through postposition processing creates the NC program that measures program process. Graph 1 it is to measure advocate accuse a dialog box, graph 2 measure parameter to install a dialog box for left tool carrier. Graph 2 measure craft parameter to set draw a frame round this system in order to deploy the measurement of the lathe of numerical control of double tool carrier of system of SINUMERIK-810T numerical control the numerical control process designing of the process regards research as the object, the system covered the measures a process numerical control process designing of lathe of numerical control of single tool carrier at the same time. The system is basic data structure with two-way catenary watch, the digit of cutting tool knife of an a node in catenary watch is corresponding measurement point is occupied and relevant technical data, the use of two-way catenary saved data storage space, and improved the executive efficiency of modification function of the system. For the measurement of convenient user the process plans, the system offerred program cutting tool to be cut and cut a work paragraph the cutting tool trends of athletic contrail shows, make program process more intuitionistic, the spot feels stronger. Graph the 3 knot composition of a picture that are a system. Graph 3 turning measure a graph parameter of cutting of 2) of framework of system of automatic process designing is online the place before metrical principle is like is narrated, in the numerical control lathe of system of use SINUMERIK-810T numerical control, use the function of cutting tool monitoring that numerical control system provides, pass namely adjust number of monitoring of a certain cutting tool appropriately (the value of cutting force gain of the H8230) correspondence that narrates as follows, when making cutting tool and workpiece contact begin cutting, cutting force already reached the cutting force limiting value of set, from this the system carries out what stop current block automatically, deposit coordinate of right now X, Z in R94 of systematic R parameter and R95. In certain and large structural member (be like train wheel) in practice of numerical control cutting, want to assure cutting tool durability, the cutting tool radius of the lathe tool that uses commonly is bigger (R10 ～ R20) . To assure the validity that mental allowance measures, cutting tool must the law of edge cutting face to cut work. In addition, measure cut fashionable should falling without circumstance of compensatory of cutting tool radius undertake, measure namely cut paragraph should use G40. Following NC program is the numerical control code that measures a process namely. ... G0G40X963.

75Z93.

967G1X915.

189Z93.

814F5H8230 R94=0R95 @714 G1@720R94K1X891.

219Z93.

215F1.

2 @714 @360R601K1... R801=R601-445.

609R535=0.

999In system of N20R610=R801/R535SINUMERIK-801T numerical control, instruction " @720R94K1 " the coordinate of the direction of diameter of X(of coordinate of cutting tool center when action is worth to exceed cutting power set) in sending R94 and R95 respectively with Z, save; And dictate " @360R601K1 " it is the coordinate value that the diameter in existence R94 directional coordinate is worth changeover to become radius way, and will in stocking parameter R601. From this knowable, what deposit in R601 of systematic R parameter is to radius when X of point of a knife and center of the cutting tool when workpiece is contacted coordinate is worth. By the graph 4 knowable, b(x, y) nods the measurement point that is a program, cutting tool radius is R, and measure cut fashionable the law that always is edge workpiece surface to cut, so we can be calculated the unit law arrow of the cutting surplus that in giving a picture, shows (i.e. pursues 4 measure mediumly cut Duan Fang Xiang Shi measures) . O- - A of cutting tool center- - contact of point of a knife nods B- - measure a program to nod θ- - cut way vector and X axis included angle- - measure cut paragraph of direction vectorgraph θ of =(cos of sketch map of computation of 4 cutting surplus, sin θ ) by the graph the geometry of 4 concerns calculable the T of rough machining surplus that gives T0 of total cutting surplus is thick. T0=BO-R of total cutting surplus, BO=(R601-x)/cos θ , so T0=(R601-x)/cos θ - R is like surplus of foregone finish machining to be T essence, by total surplus calculable give rough machining surplus. θ of =(R601-x)/cos of essence of T thick =t0-t - the CAPP that R-t essence 3) measures a process measures process CAPP to comprise by two measure: Measure cut paragraph of program and measure cut paragraph of program. When undertaking metrical process CAPP, in left / right tool carrier measures parameter to install the input in the dialog box to measure craft parameter. To assure the validity that mental allowance measures, measuring cut fashionable, the normal direction that must assure surface of spare parts of cutting tool edge cuts work. Determine the position of measurement point for convenient user, the system provided two kinds of meanses, these two kinds of methods are respectively: Law to to workpiece, law to from workpiece. Its meaning is as follows: The law pursues to what choose measurement point location with data button above all to workpiece user element, and measurement point is a mouse nod cutting currently paragraph law to umbriferous dot (if pursue,5a place shows) . The rough machining surplus that gives according to computation and process designing person consult every knife of set of place of cutting craft standard is the biggest cutting measures Amax, can calculate a frequency taking a knife and amount of every knife cutting. A- - the B of mouse selected element of element of graph of measurement point place- - the mouse nods C currently- - cut paragraph terminal graph the way of two kinds of way that 5 cutting tool cut work to use data button to define measurement point above all from workpiece user, the system makes measurement point at this o'clock be in the normal of graph element too, and another end points that cuts Duan Zhi line is the magic art that the mouse chooses this normal currently to umbriferous dot (if pursue,5b place shows) . After measurement point is certain, can be in according to need the system is dynamic (the trends that chooses cutting tool and elastic shows) the help comes down to decide other cut paragraph. Additional, for the operation of convenient user, when the program cuts a point, the system gave out to hint in detail to every measure. After cutting paragraph of program to finish, catch those who plan to measure a process to be cut paragraph, to assure to measure the validity of the process, systematic regulation cuts the first paragraph to mix cut last paragraphs identical, the system also was offerred at the same time cut a trends accordingly, help user undertakes cutting paragraph of program. After all measurement point all plan to finish, use a system save file to disk the measurement that the tool will plan data is stocked measure a knife in technical data file. 3, measure postposition processing to finish after measuring process CAPP, the postposition that calls a system handles module a future life to measure the NC order of the process into turning. Well-known, when undertaking cutting for the cutting tool of 0 with radius R, should compensate in radius of use cutting tool commonly (cutting undertakes below the means of filling G42) of Zun Dao filling G41 and right knife. But because measure when, the law of face of cutting of cutting tool edge to cut work, so cutting tool must be in remove a knife to fill work is cut below G40. Note: Graph 6 in drew bit circle only, sincere circle begins to contact the condition when workpiece for cutting tool; The O1 of the centre of a circle of dotted line circle is in measuring NC order, measure cut paragraph eye punctuation coordinate. Essence of life cuts surplus A essence to be DE paragraph length, the coordinate that measures a program to nod E is (X, z) . What the graph shows 6 times is cutting tool is measured cut contrail of fashionable cutting tool motion, its process is: Cutting tool nods rapid movement G00 to B from A, nod to C with G01 again, nod to O1 with a slower feed speed G01 finally. And actually, because action of cutting tool monitoring is right the correct set of cutting force (the H instruction H8230) in NC program is being narrated before be like, when just was being contacted with workpiece when point of a knife so (if pursue 6 in the) when cutting tool center is nodded at O, the cutting force monitoring that already achieved set is worth and stop cutting. What postposition program needs to solve is O1(x1, the computation that Z1) nods. The algorithm of O1 is shown as follows. After computation gives O1 to nod coordinate, also got metrical cutting the coordinate of paragraph of eye punctuation, namely: "G1@720R94K1X891.

219Z93.

215F1.

2 " medium X and Z coordinate value, by " @360R601K1 " get a picture 6 in the X coordinate that O nods (the) in existence R601, by " R801=R601-455.

609 " computation gives total surplus to be in of X direction umbriferous, again by " R535=0. 999 " the directional cosine Cosq of the unit law arrow cutting face stocks R801, finally by " N20R610=R801/R535 " obtain total cutting surplus (the) in existence R610. 4, the automatic process designing of the CNC Machining that the function of cutting tool monitoring that the last word uses numerical control system will come to realize cutting surplus to be measured automatically, to solve semifinished product to make precision the CNC Machining of low large casting, forging found out an efficient way. System of this automatic process designing uses plant of tire of Yu Magang wheel successfully now, achieved different nation the process designing of turning numerical control of the train wheel of different type. The use of system of this process designing raised process designing precision greatly not only, and multiple the land improves process designing efficiency, the wheel that the NC procedure treatment that makes with this system gives accords with blueprint requirement completely via examining. This system has very great promotion value to the process designing of automatic numerical control of large casting, forging. CNC Milling