Automobile body is small-sized the general means that stamping workpiece check provides a design and measure

Specific design builds 1 workpiece and check the model should consult above all part drawing paper analyses workpiece, preliminary protocol check has design plan, decide the datum plane that check has, concave and convex case, detect face of sectional, fixed position, simple scale secondly dimension sketch map. In the design that provides in check, it is crucial that the design with specific check builds a model, it affects check to provide directly whether detect accurately workpiece quality. Because automobile body enclothes a characteristic that gives priority to with free curved surface, "Objective is begged instead " it is the current method that builds a model at present. Beg instead namely the workpiece that the basis has existed or objective prototype, undertake with laser scanner data is collected, pass data processing, three-dimensional reframe wait for a process, construction has the method of the archetypal model of specific figure structure. We use laser scanner to undertake sweeping to workpiece surface of the standard slightly, gather the information of workpiece surface feature that gives priority to with nodding the cloud, the point coordinate changeover reachs below automobile body coordinate, with Surfacer software processing nods information, get the diagnostic curve of workpiece surface curved surface, build model of final free curved surface thereby; The largest the least space that curved surface can go to through nodding the cloud in the meantime will detect builds original shape model. What should notice is, the model that gets right now is a body model that does not have ply, should sweep according to scanner slightly the surface distinguishs this model to be workpiece inside or outside face, this specific to check design is attached most importance to especially should. Have free to workpiece curved surface to realize check detect, the surface inside the surface that makes check specific commonly and workpiece holds the invariable clearance that 2-3mm controls, CNC Machining machine tool can design according to place model face digital-to-analogue is achieved relatively the requirement of high accuracy, when detecting actually, provide through check model the deviation that the face cooperates appropriative measure reciprocating translation to be able to measure a workpiece curved surface. Of the outline outside workpiece detect the method basically has two kinds, when the check that designs a correspondence provides: ① check is specific tangential and outward outspread 20mm controls the outline outside exterior edge workpiece; Law of the outline outside ② edge workpiece is down outspread 20mm left and right sides to direction. In current CAD software (in be like UG) , the distance that expresses workpiece inward Offset2-3mm (if what generate workpiece model is outside face, add the ply) of workpiece even when making Offset, catch an edge of this curved surface of its outline tangential or law to outspread 20mm, get check detects specificly the surface, be apart from certainly to datum plane drawing again is check namely specific model. Because automobile body is enclothed relatively complex, need the couple of two kinds of afore-mentioned methods mostly when generating check to provide check-up to measure the surface, and to a few special model face, this still come true hard. The graph is shown 2 times for complex model the processing sketch map of the face. In the graph inside the workpiece surface of engine pedestal is in 1, 2 two point are obvious generation intersects oneself and interfere, get detecting to assure the main outline of workpiece, sacrificed to have what the corner with perpendicular poor height is in to detect, the check that if plan institute is shown,makes is specific the surface, in check outline of workpiece of particular face edge is mixed finally removed 3mm double underline, detect in order to go to the lavatory workpiece outline. Of course, provide in check (especially check is specific) a lot of similar problems still can be encountered in the design, need what have a principle to check to permeate understanding and experience to undertake handling. 3.

The design of 2 section example builds a model of face of crucial to workpiece shape detect come true commonly through section example, the section example that check provides is divided to rotate type is mixed insert type two kinds, when the span of section example exceeds 300mm, it is those who assure perpendicular direction to detect precision, its normally the design is insert type. Check is specific what the surface detects is workpiece inside the surface, section example criterion over or across is on workpiece appearance face, with will detect crucial and sectional outside face, general 2-3mm of face of appearance of workpiece of distance of its job surface, its build modular method and check to have the face similar. The board body material of section example is the metal such as steel or aluminium commonly, working surface part can use aluminium or colophony to wait make. The section example of complex form face can generate interference when rotate or be inserted, in be being designed actually, can handle its section, if pursue,3 are shown. If be installed,insert style section example, sell with work location produce interference; If be installed onefold rotate type, because workpiece itself loses face sex more, cause as specific as check or workpiece happening interference, its the design becomes two independence to rotate style section example, can satisfy the requirement that detects in the round. 3.

The fixed position with the fixed position of 3 workpiece and clamp correct and reasonable workpiece is accurate metrical base. Automobile body is enclothed the orientation way that go up is provided to clamp of Kong Hega head locates or basically use permanent magnet clamp to cooperate to finish by fixed position in check. Provide as check medium wide application is made in automobile body, collet of lever type activity and permanent magnet all have seriation product choose and buy, mobile collet still configures the support that has different type and measure or bracket. Mostly automobile body is enclothed have advocate, deputy aperture of two fixed position, advocate fixed position is sold sell for cylinder commonly (round hole) or lozenge is sold (lumbar aperture) , in order to restrict X.

The freedom of two direction of Y is spent; Deputy fixed position is sold for conic sell or lozenge a place of strategic importance is sold, in order to restricts Z.

X.

Y.

The freedom of four direction of Z is spent. When design check is provided, in check specific the stiletto of position of fixed position opening that go up (sell lining in order to be put into fixed position to be accurate) , give out the automobile body coordinate of fixed position aperture. In the meantime, better in workpiece tigidity and distributing logical place decorates fixed position spacer and mobile collet, reduce clamp check the number in order to make sure the firm fixed position of workpiece wants when the design to measure as far as possible, assure to interference does not generate with other component when mobile collet works, the operation that considers a worker is convenient, give out finally the automobile body coordinate of center of the surface on fixed position spacer. To having the work of aperture of a fixed position only, as a result of advocate fixed position aperture can restrict two freedom to spend only, fixed position spacer also has the effect that spends to limitative workpiece freedom, circle in order to prevent workpiece advocate fixed position is sold rotate (see a picture 4) 3.

The design of 4 motherboard assembly is in check is specific on the distance with certain drawing of direction of exterior edge datum plane, make its nadir is more than the ply of 150mm, have enough strength in order to make sure check is specific, make check specific as far as possible at the same time underside, namely of motherboard assembly go up the surface () of tool reference plane, on the whole digital place that ties in automobile body coordinate. Check is specific motherboard assembly is general by substrate, channel (when necessary the inter adds I-steel) , fixed position piece is mixed universal annulus composition, when substrate by check specific after been secure, other component can choose standard type name according to actual condition. 3.

Of 5 aperture detect the need such as the opening that wants to a lot of weighing in automobile body stamping workpiece and flange detects alone. Be in normally in the design that provides in check check is specific on the surface adds 1mm to control thick protruding station, the center of protruding stage and workpiece aperture center are on same axes, the diameter compares bore diameter big 5mm, use on protruding stage double underline means to detect (5) seeing a picture. When the precision demand of the aperture that be measured is higher, the means that uses fixed position opening detects with plug guage and lining. 4 epilogue are in automobile body is large enclothe in, the figure that provides as a result of this kind of check complex, bulk the giant, cost that make is higher, detect the object is onefold, flexible poor, obtain much accurate information quickly hard, already was detected by advanced automation stage by stage method (like online testing system) be replaced, but the detecting of the small-sized stamping workpiece that produces to large quantities of quantities, at present our country car produces manufacturer to basically still rely on this kind of check to provide. CNC Milling