NC emulates software to process medium application in cutting
Time:
Click:164
source:NODIE CNC Machining
Fictitious machining technology (Virtual Machining) already was born very long, as the progress of science and technology, three-dimensional CAD is applied extensively at products plan, in the project design of exercise design, treatment working procedure and product assemble the respect such as degree, need develops the computer to assist a technology, assist a project in the computer especially (CAE) respect, use finite yuan of law (FEM) come beforehand analytic research and product property are the construction of relevant couplet, hot conductibility and use a CAM (CAM) the process designing technology of contrail of motion of affirmatory cutting tool, each domains that already all sank a project and be used effectively. Cutting machines the development tendercy of emulation technology to include two fields, it is development NC emulation software firstly, so as to shows contrail of cutting tool motion, judge clip of cutting tool, knife and workpiece and its clamping apparatus to whether generate interference. When undertaking mill is machined standing, the mainest task is to excise blade of cutting tool cutting to wrap what face of subsidiary channels in the human body through which vital energy carries a share to be machined material, the part that makes reservation comes down is become already machined a face. Finish the software that this kind of treatment uses to should include following content: Collet of cutting tool, cutting tool, workpiece, clamping apparatus the harmony that wait, of machine tool main shaft make the range that reachs its to be able to work, can the movement of bona fide emulation machine tool and cutting tool. Especially in last few years, increase what machine as a result of 5 coordinate cutting ceaselessly, the value that should undertake before be machined actually NC is emulated is increasingly outstanding. In emulation software of this kind of NC, many software have very superior performance, if can excise volumenometer cipher out to machine efficiency from the metal; According to the metal excision bulk judges cutting treatment to whether produce overload; If bear is secured, because feed speed passes tall and generation overload, emulation software can adjust feed rate, prevent overload generation, can shorten cutting handling time. The another development tendercy that cutting processes emulation technique is the physical phenomenon in studying analytic cutting machines a process, if be machined,produce quantity of heat, by excision material after face of the knife before ceaseless brush cutting tool forms knife bits by eduction, and form by the data that blade excision does not need cutting tool cutting on workpiece already machined a face to wait, and this a series of cutting processes come out through computer simulation, current, the product that can achieve this kind of ideal goal returns number not much. Of company of Third Wave Systems " AdvantEdge " it is to use finite yuan of software product that the law has special actor dissolves analyse to cutting treatment, with use at construction analytic finite the bag compares yuan of law order, its are the biggest the advantage is user interface admirable, the technical personnel of machining can undertake conveniently analytic. Of company of American Scientific Forming Technologies " DEFORM " it is to forging wait for plasticity to be out of shape treatment is used finite analytic program includes yuan of method, already was turned to be used at cutting to machine recently. Cutting process is to cut bits, be out of shape by the flexibility of treatment material with plasticity metabolic is out of shape process, with punch, forging wait for plasticity to be out of shape quite, be out of shape speed (the deflection that unit time produces) very big, the energy that produces by attrition on face of the knife before the plasticity that arises from this is out of shape energy is mixed will be caused calorific, make temperature lifts substantially thereby, point of a knife makes be destroyed by treatment material in successive and narrow range, depart is become cut bits and already machined a face to wait, this is the striking feature of cutting process. And these phenomenal the other party are put in mixed mutual effect here. If use finite yuan of analytic means, need to input following content: By the physical character such as treatment material character and attrition condition; Cutting condition and the attrib border condition such as cutting tool appearance. Pass finite yuan of analytic and rigid equation, can output cutting force, cut temperature of horn, cutting to wait contain those who cut bits to make condition feature to quantify parameter, the process is here medium, need not build mathematical model or put forward hypothesis. The basis is finite yuan of analytic result, still will cut bits to create process, stress easily, be out of shape wait for physical quantity implementation is visible. Should obtain high accuracy analytic result, most serious input content is report by treatment material stress -- be out of shape the material of the relation is characteristic, and material is gotten characteristicly is very painstaking work. Henceforth, as the accretion of computer power, the physics of process of this kind of cutting emulates a technology to will gain ground gradually. Whether rapid all-pervading key depends on whether offer what what need in time to be machined to the user the material of material is characteristic. By need to develop cutting to machine emulation technology software. Current, a lot of brainpower are undertaking manufacturing a project in most the research of cutting processing technique of the foundation, among them the purpose of most research is to be in clear up treatment phenomenon while, undertake forecasting to machining a process. If these study content realized computer software of the system to change, mean can form a cutting to emulate technical software. The concerned cutting that if college of Tokyo farming work is mechanistic,the lab solicit comments of the courtyard is undertaking a few kinds forecast a gender machines the research of emulation technology software. Technological process and practical emulate used transverse the research system that matchs with fore-and-aft photograph, transverse answer relatively to treatment working procedure with products plan; Even if exceed upgrade up,be in, practical better, it is practical not only downward, what still include to machine a phenomenon is analytic with implementation visible. Nextpage one, database of cutting tool information and the cutting condition that analytic emulation technology uses choose a system to be in actual cutting process, should not copy what tool works offers to recommend cutting requirement, and should assemble the particular case such as card according to system of machine tool, tool, workpiece, undertake cutting will amend cutting requirement trying repeatedly. The library of referenced data data-in of the effective that in still answering to machine the past at the same time, accumulates, using these data effectively while, have the aid of is analytic the method makes cutting condition achieves maximize; To consulting the new cutting of data is machined, should develop the cutting condition related to this to select a system. In this system warm up precision of oscillatory, treatment, cutting tool, the set such as cutting tool life, leftover stress is analytic content, on analytic foundation, can choose to give first-rate cutting tool and adjust cutting requirement. The data of this system divides roughly for 3 parts: Condition of composition of system of data of cutting tool information, tool, cutting. Parameter of effective cutting processing technique can be accumulated in cutting condition. The optimal milling efficiency that the article drafts to state with legend crop establishs milling cutter to machine and error of maximize lateral appearance. What according to the database the choice needs cutting tool and knife clip, the change coming back of the flexibility that forecasts You Lixi knife and knife clip and card head and part of union of main shaft taper changes causes machining error. Of cutting force forecast the cutting power that uses part of point of a knife to take the pattern that defies force with comparing cutting. This is a kind the handiest method, but the favorable result that got cutting force weaveform and actual measurement value agree however. Computation gives the cutting tool bending that each instant causes by cutting force to measure, be linked together its and the displacement that form the cutting blade place that already machined a face to be able to get already processinged the form of the face. With large-scale finite the computation of yuan of law is compared, computational time is very little, input cutting tool information and cutting condition information, emulate machining error easily. Although the cutting that suits really already was had to machine a condition in the database, people still hopes to reduce machining error further, improve treatment efficiency. Example makes clear, be emulated with this kind and realizing maximize means to amend cutting requirement is completely likely. 2, the cutting tool temperature when establishing milling cutter to machine in recent years, high speed milling is very general already, be informed by experience, it is applied to small the milling condition that cuts deep, big feed, and it is quite difficult however to hold optimal condition. Milling treatment and turning treatment are different, former belong to interrupted cutting, in machining a process, cutting tool warms up and ground of cooling high speed undertakes repeatedly. Because heat conducts cutting tool -- the contact that cut bits is intermittent partly undertake, must come according to this one feature the change of temperature of analytic cutting tool. Heat conducts a quantity to be affected to forecasting precision very big, but do not need what create position to cutting bits to be out of shape with hot analytic photograph connection has large-scale consideration, because this can achieve analytic result quickly. The cutting speed, combination that cuts deep, feed will affect highest temperature, when treatment efficiency is certain, raise feed rate, cutting tool temperature can be reduced, thermal drop is small often can make of feed speed rise reach the limit, and raise feed rate, treatment surface can become coarse. Accordingly, if can balance the relation of surface roughness and temperature well, with respect to the cutting condition that can choose both and mutual balance. 3, with finite the physics that has cutting process emulates yuan of method using finite the physics that has cutting process emulates yuan of method in, the content that inputs as cutting condition includes: Character of material of the horn before ply of cutting speed, cutting, cutting tool, horn after cutting tool, workpiece. Undertake to these parameter analytic hind, can obtain the cutting force, appearance that cut bits, cutting tool and the temperature that cut bits to go up to distributing, stress distributings, deformation distributings, leftover stress distributings wait for physical character to output a result. This kind emulates pair of special cutting position (like dynamic cutting) also be applicable. Cutting excises a process into the weaveform of undee surface (Wave Removal) in generating a process to show the process that attenuates in the ply that cut bits with the weaveform of the cutting side vibration of cutting tool edge, cut horny decrescent, be out of shape center and arise to be out of shape greatly. In such dynamic cutting process, cut horny happening change, what answer relatively with this is to cut what bits generates to be out of shape scope magnitude also produces change, because the cutting ply of this cutting force and point of a knife does not become direct ratio. Cut angle change to pursue knowable to what answer by the fluctuant photograph with ply of cutting of point of a knife, although ply of cutting of point of a knife is identical, corner is cut than what amplitude decreases Xiaoshi when amplitude increases big still, benefit Sa if (Lissajou) graphical lower part shows protruding half moon. According to such analytic result, ability makes of the phenomenon visible reach understanding to become a possibility, develop more practical high accuracy thereby approximate and analytic law. Additional, the cutting of different to material character compound metal stuff is machined, and in that way cutting tool is in as oscillatory as ultrasonic cutting the treatment such as the interrupted cutting side vibration of cutting direction edge, all can use physics to emulate a technology to undertake analytic. The analytic example when distributinging with layer shape by ferrite and pearlite is knowable, because each position that distributing is different, cut the condition with curly bits to have very big difference. If be in data design,can apply the analytic result that physics emulates effectively, possible implementation does not rely on bits chamfer to undertake bits is handled cutting. In ultrasonic vibration force of the cutting in cutting is reduced, it is the oscillatory frequency because of oscillatory cutting greatly prep above cutting tool -- by treatment data system inherent and oscillatory frequency. The cutting strength that this kind of analytic place gains is intermittent action is mixed in cutting tool cut the force between bits, reduce the effect that waits for other element without attrition suppose, force of this kind of cutting and normally cutting is same. CNC Milling