A research of metabolic of class A curved surface is covered outside the car

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The article introduced the definition of curved surface of car class A, it is with figuration of punch of door shell plating exemple, introduced to apply PAMSTAMP-2G software to make a metabolic of spring back of class A curved surface is enclothed to analyse a method outside the car. Pass finite yuan of analysis method, in products plan phase accurate sentence position of metabolic of class A curved surface beforehand, optimize the exterior quality that will increase a model through the design. Current, world auto industry is occurrent tremendous change, it is traditional market of the representing with Europe, beauty and day, had entered regain level quickly, and with " golden brick Shikoku " (Brazil, Russia, India and China) the rise of the rising market that is a delegate, changing the structure of global automobile industry and market, spreading out contend with the car manufacturer of old brand tradition. Each Motor Corporation for market of rapid and occupational car, roll out function ceaselessly moderate of good, price and take a comfortable car product, in order to satisfy the requirement of car user. And the appearance that automobile body is car product, it is affecting the exterior quality of the car not only, and also affect a car multiply a comfortability. The car enclothes a leading defect to have corrugate, burst and spring back. Spring back phenomenon basically is behaved uninstall ministry of standoff of the spring back, spring back that cut a margin to uninstall spring back for whole. After spring back quantity allows common difference more than, make figuration defect, affect the geometrical precision of the spare parts. And the spring back of area of car A area makes exterior quality great sell at a discount. Reduce spring back through although can be on certain level,improving punch technology, but cannot from go up at all eliminate. Accordingly, it is very important to in design phase the spring back that outside sentencing a car well and truly beforehand, an A area area covers is out of shape and adopt precautionary measures. Class A curved surface introduces class A curved surface (Class A Surface) it is the those visible in the product curved surface that has specific physics sense. Class A curved surface is used at the car above all, and gradual in consuming kind of product, it also is aesthetic need. In the car production enterprise has such taxonomy: To automobile body, a face shows automobile body appearance is visible commonly reach interior trim to see, be like shell plating of coping, engine cover, ala child board, the component such as bumper and interior trim dashboard; B face is to point to door inside board reach a floor to wait large sightless; C face basically is structural member, wait like bracket sightless. If pursue,two curved surface of 1 connect, inspect attrib border join to will have the following G0, G1 and G2 3 kinds of circumstances: 1.

G0 curve (face) on existence needle is nodded (fold breakpoint) , in its both sides, slope and curvature have leap, this kind of curve (curved surface) just connect jointly at same border. Detect with zebra crossing, the zebra crossing of joint is those who disconnect (see a picture 2) ; 2.

G1 curve (face) go up existence point of tangency, in its both sides, slope is identical, but curvature has leap. This kind of curve (curved surface) smooth, namely first-order derivative is identical, this kind of curved surface is cut in phase in all at same border, slope is successive (curvature is not certain and successive) . Detect with zebra crossing, the zebra crossing of joint is connective, but pointed horn transfers (see a picture 3) ; 3.

G2 curve (face) the curvature of each dots that go up is successive change, the attrib border curvature that receives in joint appearance is identical, namely 2 rank derivative is identical. Detect with zebra crossing, the zebra crossing of joint is connective, and it is round glide is crossed (see a picture 4) ; In fact, cut consecutive drop to be able to satisfy major base industry continuously (industry of aviation and spaceflight, shipbuilding and BIW) . Be based on these application, do not have the need with continuous curvature normally. A face standard belongs to the core technology of car company, reflected the style of design level zephyr of an enterprise. The A face standard of Europe department and the design firm with department business, professional day and fittings module supplier is taller, have very strict A face level. Forecast cover a method of A face metabolic we are with shell plating of some model door exemple, apply PAMSTAMP-2G software to elaborate forecast a car to cover a method of A face metabolic. Using board makings take shape finite yuan of process that emulation analysis software has enclothing a punch emulation is medium, basically include 3 primary shares, build figuration of face of design technology model, punch to emulate namely reach analytic computation result. To be being enclothed outside the car for, of the first foreword pull delay figuration working procedure to be weighed particularly should, pull the figuration effect that delays working procedure to will decide quality of final spare parts exterior, pull extend process spring back is out of shape eliminate hard in follow-up figuration process. Here, we will be right door shell plating (see a picture 5) pull delay working procedure to undertake emulation, undertake the spring back after delaying is calculated pulling next, have analysis and research to spring back result finally. Nextpage1.

Pull the design that extends craft model range to pass software of relevant and three-dimensional CAD (like CATIA V5) finish pull model of maths of the foreword that delay labour (see a picture 6) design, its translate into current data format (this our changeover is IGES) mix curved surface data pull the feature that delay muscle to read in PAMSTAMP-2G, undertake reseau differentiates again. 2.

Strike out form emulates the material of process door shell plating to be B180H1, material ply 0.

7mm, pull delay figuration process cent to attach most importance to force level, close level is reached pull extend phase 3 stature processes, if the condition of board makings figuration of every subroutine pursues 7, graph 8 show 9 times with the graph. 3.

Spring back is out of shape emulation process forecasts measure of key of A face metabolic is the consideration that has spring back in PAM, after punch ends, board makings distributings because of in-house stress not all and reason of existence flexibility metabolic, appearance can produce constant change, having very big effect to quality of final take shape. Process of set of spring back attribute is as follows: (1) definition board makings refines attribute to be " 1 " ; (2) attribute of spring back of definition board makings is " Implicit " ; (3) object of demarcate of rigid body displacement is founded, what because of spring back computation uses is concealed form calculation, accordingly, one secondary avoids to produce needless rigid translation or roll in the plasmodium in computation as far as possible. For this, go up through defining plasmodium 3 are nodded, in all 6 displacement freedom is spent, with avoiding the happening of afore-mentioned circumstances as far as possible (see a picture 10) . 4.

Of spring back of strike out form detect assessment technique of commonly used curved surface character has reflection line way (Reflection Lines) , wait for law of line of intensity of illumination (Isophote) reach tall light way (Highlight Lines) etc. PAM software also offerred a variety of detecting the tool of curved surface quality, if scanning beam detects, tall smooth test and oilstone test method. Here, we apply PAM medium " Analysis " → " Result Analysis " → " Surface Analysis " the tool is mixed to figuration condition the condition after spring back undertakes check and contrasting, if comparative result pursues 11, the graph is shown 12 times. Through analysing result and actual condition (see a picture 13) comparative, PAM software judges the spring back that gave door shell plating well and truly to be out of shape risk. The position of spring back of strike out form that epilogue car covers a design phase to forecast it is very crucial job. Because spring back is the last pace of figuration, any errors of the generation in figuration process imitate can accumulate phase of spring back computation, accordingly, the accuracy of result of spring back imitate depends on greatly the imitate precision of figuration process. PAM software provided strike out look the analytic method of whole process, the spring back that can forecast strike out form well and truly is out of shape, optimize through the design be out of shape spring back control is in tolerancepublic errand limits, reduced truckload development cost greatly. CNC Milling