Product development and manufacturing process, the geometric modeling technology has been used quite widely, but for various reasons, there are still many products are not described by the CAD model, design, and manufacturers are faced with the physical sample. In order to meet the advanced manufacturing technology development, through a certain way, these kind into the CAD model, so that it can use CAD, CAM and other advanced technology to deal with now, with this sample from the physical mathematical model for product-related technology, has developed into CAD, CAM in a relatively independent areas, known as manufacturing process, the full use of CAD, CAM and other advanced technologies due to the implementation of reverse engineering in a very short period of time accuracy, can * copy the real sample, so the enterprise of reverse engineering has become the hot topic of advanced manufacturing technology one of the reverse use of some non-professional design software (such as: UG, Pro / ENGINEER, CATIA, etc.) and some professional reverse design software (such as: Surfacer, CopyCAD, Trace, etc.) for reverse modeling in reverse engineering at this stage A typical example of enterprise applications due to new product development needs, I use parts of the UG software in the form of reverse complex automotive stamping reverse design applications to achieve better results in our choice of measuring equipment of British LK coordinate measuring machine can be used to measure the characteristics of the spatial coordinates, scan profile, measuring the parting line and contour. this point the device to obtain the amount of data like the laser scanner so big, so with some non-professional reverse design software is appropriate. UG shape to follow the reverse: the surface point r r r lines of the general body of principles one measuring point of the measuring points before the planned how dot by dot surface designers made the request. the general principle is that the curvature relatively large changes in some of the local RBI to close, smooth, you can dilute some of the places due to the coordinate measuring machine to take the general point of efficiency significantly lower than the laser scanner, so the parts to be targeted when the measuring point is worth noting section is in addition to scanning, measuring the parting line, the measured contour lines and other features is necessary, it will bring convenience to the time dimensions. Second, the connection (1) connection point before finishing a good finishing point, including to delays, significant deficiencies point in the same direction of the profile points in the same layer, the parting line point, put a layer of single-point holes, contour points also put a layer of separate, easy to manage usually work at this stage of the measuring point completed, the software can also be done in the UG Generally software can be pre-set measurement points placed layers, while measuring points, while finishing (2) point-point connection with the parting line as far as possible and smoothing the smallest error, because in In many cases the parting line is the combination of product assembly lines. for automobile, motorcycle parts in general, the connection error is controlled at 0.5mm below the connection to be targeted, according to the shape of the sample, characteristics generally method to determine the dimensions to determine which lines need to connect, not even what line. connection available lines, arcs, splines (spline). The most common is the kind of line, use intervals as even as possible, ignoring the first place with rounded corners windows 7 activation key, made of sharp corners, and then finish the round surface (3) to adjust the curve due to measurement error and sample surfaces are not smooth and other reasons, even as the radius of curvature spline change there is often a mutation of the future dimensions of the impact of smoothing, so the curve must be adjusted to smoothing the adjustment of the most common method is to Edit Spline, choose Edit pole options, use the mouse to drag control points. There are many options, such as restrictions on the control point in a plane, to a certain direction is coarse or fine spline and open display of the use a spline endpoint to another, enabling the build surface intersection curves, but must be noted that, no matter what command to adjust the curve will have a bias to adjust the more the number, the greater the accumulated error. allowed value depends on the kind of error pieces of the specific requirements of decision three dimensions using various methods to establish dimensions of surfaces, including Though Curve Mesh, Though Curves, Rule discount windows 7 key, Swept, From point cloud, etc. dimensions of the choice of methods according to the specific characteristics of sample conditions given. I The most common is Though Curve Mesh, a good curve will be adjusted using this command woven into the surface. Though curve mesh dimensions of the advantage is to ensure the continuity of surface curvature of the boundary, because you can control four weeks Though curve mesh boundary curvature ( tangent), thus the quality of higher dimensions, while Though curves can only be guaranteed on both sides of curvature, when the error in the dimensions are greater. intersection if the two surfaces to be round, because Though curve mesh surfaces of the two cross-border is line, this line is clearly better than two Though Curves intersection surface smoothing, such Blend rounded out the quality is not the same. beginner reverse shape of the time, often between two faces, This is mainly due to the two surfaces are not tangent. to solve this problem by adjusting the dimensions involved (Though curve mesh) and the other endpoint of the curve in the corresponding tangent plane, plus Though curve mesh boundary Tangent option to solve and only to ensure the surface tangent tangent curve addition, and sometimes do a single and relatively flat surfaces, the direct use of point cloud dimensions (from point cloud) is more convenient, but for those who large radius of curvature of surfaces not apply when the error is larger the surface structure, sometimes the gap between the surfaces to bridge (Bridge), to ensure a smooth transition surface in the process of building surfaces, sometimes coupled with Even some of the lines, for the dimensions. connections and often have to alternate dimensions. surface is completed, to check the error surface, generally point to surface measurements error, the higher the surface appearance but also check the surface of the light cis-degree when a smooth surface not only when the surface of some rectifiable this Section, Section to adjust these smoothing, and then re-use of these Section dimensions, the effect would have been better, which is a commonly used method also constructs pay attention to simplicity. face to try to do large number of sheets of small, not too broken, this will help add some rounded back, slope, thickness and other characteristics cheap windows 7 key, but also to the next step programming process, the tool path computation will reduced, NC file is also small. Fourth, when the outer surface of the body structure is completed, the next step is to build a solid model when the model is relatively simple and do better the quality of the outer surface, the command can be used to establish solid suture thickened. However, in most cases can not thickened, it can only use offset (Offset) the outer surface. Offset command with multiple faces simultaneously choose Select All or window, this will increase efficiency for those who can not offset the surface, to learn to analyze the reasons. One may be due to too much curvature of the surface itself, since the bias will intersect, leading to Offset failure (some software of this algorithm with different algorithms, such as the rhino king who can produce self-intersecting Offset surfaces), such as small rounded; the other may have been biased surface quality is not good, locally ripple, this situation can only amend the surface and then Offset; some smoothing of the surface looks good, but is not Offset, in which case the surface can Extract Geometry into B, then Offset cheap office 2007 key, basic will be successful. offsets the surface after some need cutting, and some need to make up the surface, using a variety of surface editing tools to complete the construction of the inner surface, then stitched into a solid inner and outer surface (solid). 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