Finite yuan go against algorithm the application in Ban gold design and figuration imitate

Basically introduced finite yuan of basic theory that goes against algorithm and go against algorithm to apply mediumly in panel design and figuration form imitate in recent years, and pointed out be in figuration imitate application, go against the respect that algorithm remains to improve. Board makings figuration is efficiency of a kind of production the metal with good quality of tall, figuration machines a method it is applied at the domain such as aerospace, car, light industry widely. Will nearly 10 years be worth the rapid development of imitate technology as number, board makings the mode that form cutting cast off the past to rely on experience intuition to undertake Ban gold design and mould are designed purely, through undertaking numeric imitate to process of Ban gold figuration, design personnel analyses all sorts of craft parameter OK and specificly to be opposite the influence of process of Ban gold figuration, design reasonable Ban gold thereby with technology program in recent years, numeric imitate domain appears a kind of new research way, namely converse imitate research. Traditional to imitate technology main imitate object is in those who give mechanical condition to fall to be out of shape the process is reached be out of shape result, and converse imitate basically studies the object issues ability to get in what kind of mechanical condition given be out of shape result. In figuration of 1 Ban gold finite yuan of basic theoretic century that goes against algorithm 80 time are prime, europe and United States have partial scholar to spread out finite yuan go against algorithmic research, just appeared till the last few years industry goes against algorithmic software practically to go against algorithm to apply mediumly in Ban gold figuration basically is from the gold that beg Ban the wollens of the spare parts spreads out a problem to begin, already applied at Ban gold stage by stage now design and shape craft optimizes the respect such as the design. In launching an issue with the wollens that goes against the algorithmic spare parts that seek solution, foregone is the initiative face of the final configuration of the product and wollens, initiative ply; And the part is final the ply on configuration distributings and wollens is initiative outline is sealed, so whole and finite yuan the model must build the final configuration in board makings. The essence that wollens launchs an issue is, try a board stuff every node on final configuration the corresponding position on wollens plane, field of displacement of ambassadorial dot can make sure board makings is final the balance of configuration body. 1.

Description of equation of geometry of 1 meet an emergency is in board makings in form cutting, board makings should experience bigger flexibility, plasticity to be out of shape, use tensor of left Cauchy-Green meet an emergency so go against will describe equation of geometry of meet an emergency. (1) the B in type is tensor of left Cauchy-Green meet an emergency, (2) the F in type is to be out of shape gradient tensor. Inside the side that chooses each on board makings advocate stretchy λ 1, λ the eigenvalue of the 2 B-1 that can nod by this gives out. (3) the θ in type is a face inside advocate the 2 local coordinate with final configuration fasten stretchy λ the included angle between X axis, b11, B22, B12 is the heft of B-1. What nod each on board makings is thick to advocate stretchy λ 3 but by (4) type gets, the hypothesis with the changeless bulk in be out of shape according to plasticity gets it. Xy of Y of X of ε of logarithm meet an emergency, ε , ε is OK by (5) type is gotten. 1.

This compose equation description is using 2 stress strain when going against algorithm to undertake is out of shape begging solving, firstly every material that basic hypothesis is material yuan it is to press metabolic of simple to load, this compose equation in going against algorithm so uses deformation theory to describe, its oversight be out of shape the influence of intermediate configuration. If consider each opposite sex inside the face of board makings, this compose equation can describe stress strain as follows: (6) ｝ of σ of the ｛ in type is stress matrix, ｛ ε ｝ is matrix of meet an emergency, es is the secant model of meet an emergency of equivalent stress equivalent to measure, namely σ / ε , matrix [P] the anisotropy parameter that contained board material 1.

3 finite yuan of control equation and its beg solution to be in in going against algorithm, another hypothesis mould is to pass punch and sunken model and the standard that control an edge to encircle pair of wollens to be mixed to force to the osculatory action of wollens tangential attrition force comes simulative. Use is made in punch, board makings is in a law to be mixed to force tangential below the action of attrition force, the law of fluctuation surface is in to be balanced each other to active force in the circle that approach a limit, consider its only so tangential the action of attrition force. Virtual work equation builds to be as follows on the final configuration of workpiece: (7) the <u> in type and <f> are a bit more aleatoric empty displacement inside unit and ｝ of σ of ｛ of empty meet an emergency and ｛ F ｝ to be Cauchy stress and outside force respectively respectively. Use trigonometry film unit to undertake disperse to final configuration, attainable equation of following unit virtual work: It is vector of internal force of node empty displacement, node and vector of node outside force respectively, should make type (8) can hold water to aleatoric empty displacement, have all pair of unit application surely (9) type, assemble them into whole to balance equation (10) , undertake begging solving with Newton-Raphson iterative method but node displacement. 2 finite yuan of application in going against figuration of algorithmic Ban gold from above can see in basic theory, went against algorithm to use deformation theory to describe this compose equation, oversight be out of shape process, and simplify whole pattern to the osculatory process of board makings mix to active force for the law tangential attrition force. These two kinds simplify make go against algorithmic photograph to finite loss of yuan of method of addition certain precision, but these two kinds simplify make the computational time that goes against algorithm decreases substantially, improved computational efficiency. Because go against algorithmic computation rate is rapid, it can rise with CAD software union the inchoate design phase that uses at Ban gold spare parts comes the ply that estimation sets reckon by the piece distributings and stress of meet an emergency distributings, evaluate the mechanical property that establishs reckon by the piece and technical properties thereby. The design personnel of INECO ever will go against algorithmic at the design of the wallboard after INECO car automobile body applying, when the wallboard after design personnel is right sets reckon by the piece to undertake technical properties is analysed, after discovering figuration of spare parts punch, material jackknife phenomenon appeared in place of spare parts brim, flaw of this kind of figuration avoided after adopting form of the wallboard after improving. Go against algorithm to also apply at the craft design phase of Ban gold spare parts widely. In craft design phase, choose and compare main task is technology program, and of craft parameter optimize. Especially of craft parameter optimize, if use method of addition to undertake, will expend many computational time, raise design cost. And use go against algorithm to calculate to contain on 1000 elements finite yuan the model needs a few seconds to plant only, if use quadrangular housing unit to consider to curve effect further, the computational precision photograph that goes against algorithm arrives to can rising at method of addition 90% the left and right sides. Li Shunping ever go against algorithm to be used at axial symmetry to pull deep of technology program and craft parameter optimize, if the graph is shown 1 times,make pull deep labor situation from former 10 paces are decreased for 6 paces. After adopting new craft plan, pull deep the safe abundant of dangerous area spent burst to rise than old plan 5% the left and right sides, make the technical properties of its workpiece also got bigger improvement. In craft design phase, go against algorithm more also ground uses Yu Layan muscle and the design of the face that approach a limit. The design personnel of Reynolds Motor Corporation is in the technology design of car fender, pull with what went against successfully design to give fender stamping workpiece delay muscle. In the punch figuration of fender, main figuration difficulty is figuration deepness more shallow, figuration be out of shape adequately without passing, spring back is so bigger. The significant step that solves this problem is the setting is pulled delay muscle, let material endure bigger plasticity to be out of shape, can reduce spring back amount significantly. Graph 2 it is to did not install the meet an emergency after drawing the fender take shape that delays muscle to distributing graph, can see the material that chooses an area is out of shape adequately without passing from which, spring back is so bigger. Design personnel to adopt the plan of a few kinds of craft that goes against algorithmic apace to delay muscle to install to pulling undertake comparative, use the meet an emergency that got 3 are shown is like a graph after a kind of optimal program among them to distributing even, the figuration with lesser spring back. The development direction that algorithm application goes against in figuration of 3 Ban gold because to achieve rapidder computational rate, go against algorithm to be opposite finite yuan the model did a lot of simplifying. If be in imitate punch figuration, go against algorithmic oversight the process of wollens of clamp of the circle that approach a limit. Such simplifying, because consider what expect in clamp process medium plate to be out of shape opposite at whole figuration process lesser, so oversight this kind of clamp is out of shape; But the geometric buckling that controls edge aspect sometimes is bigger, oversight is out of shape this kind will cause bigger imitate error; Be in so the following clamp can consider to be out of shape in going against algorithm, raise imitate precision thereby. In Ban gold figuration, ban gold especially the Ban gold with more complex form multitask pace form cutting is more general. Can optimize those who go against algorithmic at parameter of the craft in multitask pace applying of design and appearance of intermediate mould geometry optimize a design. 4 last words are finite yuan going against algorithm is a kind of efficient numeric simulation tool, its photograph is finite to increment yuan of imitate method, more use Ban gold effectively of the inchoate design phase of the product and craft parameter in optimizing a design. Although photograph of its imitate precision is a few lower to method of addition, dan Jimo plans to be as a result in engineering analysis can be accepted, and as algorithm ceaseless and perfect, its imitate precision still can get rising further. CNC Milling