Imitate studies the numerical value of much element coupling that the car covers a punch figuration

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Summary: Software of use UG three-dimensional CAD enclothes a spare parts to undertake to the car three-dimensional build a model, what the part built in changing DYNAFORM is finite yuan of model; Through imitate computation is analysed, discussed to pull a variety of elements such as parameter of parameter of the geometry that delay muscle, the preform dimension, force that approach a limit, material to be opposite the influence of spare parts figuration, solved craft of mould design, punch and select material problem. Keyword: Strike out form, numeric imitate, pull delay muscle, control edge power, 1 foreword car enclothes material parameter because of its distinctive characteristic decided the car is truckload development cycle, the experience that figuration mould designs production support architect and the traditional design method that try a model repeatedly cannot have satisfied the requirement that the market grows. CAD/CAE/CAM unifinication system has made design of domestic and international Motor Corporation and a magic weapon that produce new product get the upper hand of, the adoption of this one technology, guard estimation, can make mould design shortens with production cycle 2/5, the mould produces cost to reduce 1/3, reduce greatly then truckload cost, the competition ability that enhances the market [1] . Plank figuration is at present finite yuan of emulation technology is extensive apply at a lot of domain such as car and iron and steel industry, be craft of mould design, punch make, the scientific select material of punch spare parts had positive effect. The article uses explicit power finite yuan of software DYNAFORM is right shell plating of car side wall undertakes finite yuan of analysis, delay parameter of craft of dimension of muscle geometry parameter, preform, punch, material to pulling (value) wait for a variety of elements the influence to figuration undertook study an analysis, defined first-rate figuration program for this spare parts. Use ASAME meet an emergency to analyse a method to have a test to actual part, undertake comparative with imitate result. 2 research technique 2.

Model of 1 three-dimensional geometry and finite yuan the model is built in complex model the board makings punch of the face emulates an analysis in the process, the workload that geometrical model builds holds the very large proportion of total imitate process workload, and geometrical model is built the accuracy that quality affects imitate result directly. Size of spare parts of side wall shell plating is larger, geometry range is very sophisticated, it is complex dimensional freedom curved surface more, cannot state with analytic form, can express only with parameter curved surface. The pre-treatment function of DYNAFORM can satisfy Eta ／ far from the need that builds a model, use what UG of software of large and three-dimensional model has geometrical model to build so, if pursue,1 shows the geometrical model that builds for UG namely. When building geometrical model, want to consider punch way at the same time, craft complement face reachs those who control makings aspect to add. After the spare parts model that graph 1 UG builds is built when mathematical CAD model, change interface to wait like IGES, VDA through appropriative data, turn curved surface model into Eta/DYANFORM pre-treatment implement in of march face reseau differentiate, use get used to reseau to differentiate oneself law, differentiate unit for quadrangular reseau. Mould unit definition is rigid housing unit, mould clearance =1.

1t0 (T0 is primitive board thick) , those who build is finite if yuan of reseau model pursues 2 are shown. Punch and the 1=0 of μ of static friction coefficient of board makings.

15, 2=0 of μ of kinetic friction coefficient.

04. Punch and speed of motion of the group that approach a limit are set for 2000mm/s, punch and the group that approach a limit moves at the same time, after the circle that approach a limit receives edges for doors to expect, suspend campaign, bring to bear on to control edge power certainly, punch continues to move, till the spare parts is complete figuration. Good in the definition mould can call computational module to undertake analytic computation after the motion of departmental cent and attrib border condition. Graph 2 moulds and of board makings finite yuan of model because this spare parts is large enclothe, the curved surface form of the spare parts is more complex, the punch deepness of each place is different, accordingly, can cause board makings to be out of shape flow is inhomogenous. For better control plate makings flows, make board makings is out of shape flow is even, the author built equivalent to pull on sunken model delay muscle. Installed two to pull respectively delay muscle, pull namely the A that delay muscle and pull the B that delay muscle, if pursue,3 are shown. The means that uses echelon muscle inputs each parameter, if pursue,4 are shown. Graph 3 pull the position that delay muscle to set a plan 4 pull delay muscle sectional appearance 2.

Because cold rolling armor plate has apparent anisotropy,2 material model and performance data are chosen, succumb according to what Hill anisotropy plays plasticity model criterion, 36 when anisotropy parameter can set in choosing DYNAFORM 3 parameter play plasticity material model [2] , the effect stress such as its - meet an emergency concerns [1, 2] : In type, σ is equivalent stress, input parameter has: Stretch model measures E=2.

07 × 105MPa, poisson compares ν =0.

3, intensity coefficient K, sclerotic index N, the plasticity meet an emergency of 3 direction compares R0, R45, R90, initiative succumb the ε of meet an emergency of stress 0, RP0.

2. The data performance data that article place uses sees the watch is shown 1 times. Express 1 data performance data 2.

Because the influencing factor of punch process is more complex,3 imitate analyse the setting of plan, author focal point considered to pull parameter of the dimension of parameter of the geometry that delay muscle, preform, force that approach a limit, material (value) wait for a variety of elements to be opposite the influence of computational result, designed 4 levels the computational plan of 4 elements, see a table 2, watch 3. Express the 2 computational plan that draw plan of computation of parameter of the geometry that delay muscle to express 3 each influencing factor 3 finite yuan of computation result and analysis 3.

The 1 effect that plays parameter of the geometry that delay muscle to delay obstruction to pulling is become to the punch of spare parts of large and complex form form, use pair of semifinished product to bring to bear on to make sure precision of dimension, appearance and sufficient rigid demand are general the figuration method of proper add pulling force, the flow that helps stuff of stress, control mediumly in order to increase board makings, avoid to wrinkle, pull delaying muscle is the significant step that achieves this kind of requirement. Pull through the setting delay muscle, ① can go to the lavatory to realize the control that flows to material effectively. ② increases into material resistance, make the preform that draws late position bears to pull stress enoughly, rise pull deep the blemish such as stiffness and the twist that reduce as a result of spring back generation, flabby, ripple and systole; ③ relies on to press makings face and pull delay muscle to control everywhere the force that approach a limit, can enlarge the adjusting range of the force that approach a limit; ④ reduces the demand that creates precision to controlling makings aspect. In the meantime, because pulled the existence that delays muscle to increase to press the clearance between frontier group and face of makings of sunken mould pressing, make control makings aspect wear away decrease, improved its service life thereby. Pass imitate analysis, find out each parameter and pull delay the impact between obstruction, each parameter sees a picture to playing the effect that delays obstruction 5, can see the accretion as muscle tall H from inside the graph, pull delay obstruction to increase, as the accretion of muscle wide B, pull delay fight force to reduce. Pull delay muscle obstruction is delayed to affect to pulling in each geometry parameter the biggest is round horn R2, next ordinal it is round horn R1, muscle tall H, muscle wide B. And round horn R2 delays the effect of obstruction to pulling be severalfold even ten times, if want to be adjusted inside big range,pull so delay obstruction, can come true through adjusting the volume of round horn R2. Muscle wide B is the smallest to playing the effect that delays obstruction, and delay the effect of obstruction to pulling not quite, if want to be adjusted inside little scope,help the volume that delays obstruction, can come true through adjusting this parameter. Graph the result that the 5 effects that play parameter of the geometry that delay muscle to delay obstruction to pulling calculate according to trying and the rule of going from place to place of board makings, final affirmatory equivalent pulls the obstruction that delay muscle to be: Pull those who delay muscle A delay obstruction for 50.

3N/mm, pull those who delay muscle B delay obstruction for 104.

4N/mm. The imitate of the article analyses what all be this condition to help the resistance that delay muscle. 3.

Of appearance of semifinished product of 2 board material optimize the influence that reachs pair of figuration to be in in covering a figuration process, the appearance of preform and size are very large to figuration influence, reasonable semifinished product appearance delays figuration craft to have important sense to pulling. Graph the 6 imitate results before be being optimized for board material semifinished product, can see from inside the graph, be in 1, 2 place spare parts already craze, it is the bosomy package with local suppress bigger deepness here, because material gets the compensatory and easy crack of other position material hard. The efficient way that solves this one problem is in namely the proper place of preform opens craft cut, make easily cracked area can get from the other place of photograph adjacent material complements. 3 place board expect spare part is too much, go against data flow, must undertake proper deduction. Graph before semifinished product of 6 board material is optimized, imitate result pursues 7 to optimize the semifinished product appearance after, among them 1, 2 for position of two craft cut. Graph 8 it is the result of board makings imitate after optimizing, can see from inside the FLD of graph 8-b, open two craft cut board makings flow is successful, without reappear craze. Graph the 7 board material semifinished product after optimizing pursue the 8 imitate results after optimizing board makings 3.

Of the 3 force that approach a limit optimize do not change other technology parameter and board makings performance data, install the force that approach a limit to undertake numeric imitate for 100KN, 140KN, 180KN, 220KN respectively, graph 9 with the graph 10 it is the force that approach a limit the influence of force of the ply reduction to board makings figuration, figuration. Can see, as the accretion of the force that approach a limit, the reduction of board makings ply increases. As the accretion of the force that approach a limit, figuration force is reduced gradually. Integrated a few parameter, think here craft parameter condition falls, figuration suits quite when the force that approach a limit is 180KN. Graph the 9 force that approach a limit pursue to the influence of board makings reduction the influence of the 10 power that approach a limit to figuration force 3.

4 data performance data uses what afore-mentioned craft conditions fall to play the way that delay muscle to the influence of figuration, the force that approach a limit is 180KN, change value of data performance data, if computational result pursues 10 ～ are shown 11 times. Can see, compare the accretion of R as plasticity meet an emergency, board ply reduction is reduced gradually; When the size that R is worth mirrorred laminose figuration thick to be out of shape the difficult easy degree of development, older stuff decreases R not easily more thin. So the accretion as R, reduction is reduced gradually. From the graph 11 can see, n value is reduced make meet an emergency distributings of the graph right half part double pull value of metabolic meet an emergency to increase, and R value is reduced make meet an emergency distributings of the graph left half part is pulled delay value of metabolic meet an emergency to increase. According to computational result, the optimal data performance data of successful figuration is contented spare parts: N ≥ 0.

25, r ≥ 2.

15 graphs 10 R is right board the influence of ply reduction pursues the influence that 11 data performance data is worth pair of figuration 3.

5 finite yuan of analysis result and the comparison that check a result actually apply ASAME meet an emergency to check analytic system to have real test to this spare parts, will finite yuan of analysis result and real test result undertake comparative, emulate calculative accuracy in order to examine, the result sees a table 3. Actual punch part is distributed in the meet an emergency of 2 place the graph sees a picture 7, distributinging graph of emulation calculative meet an emergency sees a picture 8. The result makes clear, emulation computation result and actual meet an emergency check result conform to, of both be identical better, process of demonstrative emulation analysis is built mediumly model, finite of parameter of yuan of pre-treatment and attrib border condition, craft is appropriate certainly. 4 conclusion (1) the round horn R2 in pulling parameter of the geometry that delay muscle delays obstruction to pulling the impact is the biggest, pull the width that delay muscle to delay obstruction to pulling the impact is the least. It is OK that the equivalent that the article designs helps the resistance that delay muscle the flow of stuff of better land control, and the choice controls edge power be 180KN can successful figuration. (2) calculate through imitate, determined size of properer shape of board material semifinished product, in primitive two technology gap is cut on board makings more be helpful for spare parts figuration. (3) according to computational result, the optimal data performance data of successful figuration is contented spare parts: N ≥ 0.

25, r ≥ 2.

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