How program of CNC Machining of lamina of test and verify

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  • source:YIGAN CNC Machining
Blade is one of main parts of turbine, especially the hair electric power that its steam road section decided turbine, affect the quality of turbine product directly. As the ceaseless development of industry of our country turbine, the design level of blade also is rising ceaselessly, basically be become sectional screwy lamina, part of molded lines of blade steam way is 3 coordinate data nods the space, treatment precision demand is very high, treatment difficulty is very great. Harbin turbine is finite liability company to raise turbine generate electricity efficiency, lower hear rate, undertake associated designing with three-dimensional company. Blade steam enter, edge giving steam is slighter, xie Ding, Xie Genyuan role is minor, arrive from treatment detect need total molded lines umbriferous fluoroscopy, and phyletic change is diversiform, need machine tool of much axis numerical control to undertake machining, very tall to equipment and requirement of engineering technology level. Accordingly, before CNC Machining undertakes the validity of program of CNC Machining of test and verify became a very important segment in CNC Machining process. The characteristic lamina steam of program of CNC Machining of path of 1 lamina steam and Xie Ding, Xie Genyuan horn molded lines is very complex for the space three-dimensional design, above all we use B-Spline curved surface to undertake planning to close to dot of blade profile data, so tectonic curved surface gives through place model value drop, next, comprehensive treatment takes away pace of width, knife the element of the respect such as radius of long, cutting tool is right its model face from transverse, fore-and-aft undertake interpolation is added respectively close, the data that place of program of affirmatory CNC Machining passes is nodded, weave thereby CNC Machining program. When program of work out CNC Machining, act on the fiducial and unified, principle that reduces knife number, blade steam path face; Xie Ding, Xie Genyuan horn; Into, the CNC Machining to program of horn of Bian Yuan giving steam is together, the program that length lamina waits for in such is opposite can achieve tens of thousands of. The characteristic of its program is; Block is longer, the span in program coordinate dot is bigger, 4 coordinate or data of 5 coordinate program are trival, the chance that make mistake is more. Because the common error in program of CNC Machining of 2 analysises lamina is current what blade steam path designs is more and more complex, precision demand is higher and higher, CNC Machining program is accordingly more and more complex also, the probability of occurrence mistake also increases subsequently. Normally the circumstance falls, if machine program weaves impertinent, the possibility arises now to arrange an issue: Interference happens between cutting tool and workpiece or collide; Selection of cutting tool radius is too big, spare parts treatment is not complete, appear to remain greatly; Choice of cutting tool radius is too little, cutting efficiency is inferior; Speed of machine tool feed or cooling condition are improper; Treatment program is unreasonable, the influence machines efficiency; The control system of the machine tool does not accept machine program; Spare parts appearance or dimension are wrong; The choice is impertinent at 0 o'clock, cannot find pair of knives to nod. The occurrence of these problems often can cause a lot of troubles to the treatment of actual part, after such as new-model makes machine program, treatment must burnish spare parts, repair spare parts or tool, spare parts discards as useless, defer product delivery. Such meetings from go up at all the dependability that weakens CNC Machining technology affects his to popularize application. Accordingly, the technology of test and verify that researchs CNC Machining program has important academic sense not only, and still have important real sense. Methods of 3 commonly used CNC Machining program verification are artificial inspection is artificial the characteristic of inspection is to compare convenient, agile. Normally scrutator reads machine program, or have the aid of reachs the cutting tool contrail when examination of tool of a few plot machines other to erupt simultaneously at squared paper show among them a few errors. Because machine program is trival and blade steam path is complex, artificial inspection needs to expend a lot of time not only, and easy appear again mistake, accordingly this kind of method already was washed out gradually. Method of treatment of experiment of experiment treatment method is one kind uses blade to experiment or other material (it is metalloid material more) the method that the spare parts has machining. Because experiment treatment is intuitionistic and bona fide reflected treatment process, because this uses this kind of need that the method basically satisfies program verification. Although the experiment machines the effective method that the law is machine program of a kind of test and verify, but it also is put in a lot of defect, basically have: Handling time is longer; Treatment precision is not tall; Take up the machine tool affects surroundings; Machine parameter cannot test and verify; Treatment cost is huge. Although use an experiment to machine machine program of law test and verify to have a lot of drawback, but can reflect whole treatment process well and truly as a result of it, and level of whole of CNC Machining of our country lamina still is in development phase, because this kind of method still is used. The computer emulates the rapid development of law of test and verify as computer software and hardware, with the computer emulation law comes the validity of program of CNC Machining of lamina of test and verify face already was used. This kind of method basically is appearance of contrail of the blade model in will machining a process, cutting tool, cutting tool show on computer graphic display come, come with this kind of method the treatment process of imitate spare parts, examination knife computation process of whether correct, treatment has occurred to cut, the way of knife of chooses cutting tool, course taking a knife, advance and retreat is logical, cutting tool and model whether does the range occur interference and collision to wait. 4 indication test and verify emulate rapid development of the technology as the computer, the computer that at present already a variety of methods are used at machine program emulates test and verify. Although use the computer to emulate test and verify one-time devoted cost is higher, but because it can be reduced greatly,can bring long-term benefit, because this already received wider and wider application. The method of computer emulation test and verify is very much, the method of test and verify with blade the most commonly used machine program is the law of indication test and verify of cutting tool contrail, be about to knife digit is occupied (knife heart coordinate and cutter shaft vector) line draw a frame round is shown come, judge a knife orbit is successive, check a knife computation is correct, occupy knife digit next with be shown to come together by the line block diagram of treatment surface, judge a knife thereby orbit is correct, the way of knife of course taking a knife, advance and retreat is logical. Its are basic the thought is: Take out all treatment surface to reach from inside result of curved surface modelling relevant model face, from the knife computational result (Dao Weiwen) in take out a knife orbit information, combine them next undertake indication, or the knife that chooses in place cutting tool model is put on the dot, make cutting tool model moves along contrail taking a knife next, judge a knife thereby vector of the knife heart position on orbit, cutter shaft, cutting tool and be machined relative position of the surface and way of knife of advance and retreat are logical. CNC Milling CNC Machining