ugg milano CNC profiling based on reverse engineer

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CNC profiling based on reverse engineering technology in the manufacturing of the mold

To determine the price after the required measurement accuracy. For the plastic mold, with the surface of its precision is generally 0.01 ~ 0.05ram, for non-match surfaces, the machining error can be relatively larger in the 0. i-0.2ram so. Typically contact three coordinate measuring machine accuracy higher than the CNC profiling milling machine, imported the precision coordinate measuring instrument is generally about 0.001ram; and large-scale non-contact measurement device (laser measuring instrument) measurement accuracy than the numerical simulation milling machine is low, usually 0.01 ~ 0. imm. In Italy Digimill-40L CNC Gantry Milling Machine Profiling profiling measurement accuracy of 0.01-0.05ram, precision of this measurement precision molds to meet the general requirements. Since the measurement data is huge, if we adopt a simple way to read the point data, will form a huge cloud, it is difficult to individually hand-edited, so in general the form is read into the measurement path. Fidia system-generated code format: NIG90G0oZ150.000N2S1200M03N3X63.387Y a 49.122Z140.000N4Z100. O0oN5Z10.0097N6G01Z0.091F60N7X59.177Y-49.116ZO. 211F300 generated code will be read by way of CAXA Track software, the results are shown in Figure 5. Surface construction and revision 2-3 CAXA software reverse engineering module will track into a surface is: track one P1ine-Sp1ine-ft (skin) processing path is measured actual three-dimensional coordinates of the points, these spatial point filter to the processing parameters,[link widoczny dla zalogowanych], measured by a straight line in order �� 8 \No. 12 Total No. 17 string together, they form a Pline. When generating Pline, must be folded back and forth against the trajectory points are processed to form a single direction Pline group. Pline generated in the process, break points on major anti-machine measurement defined by the line spacing and step length to be judged, therefore, relative to the use of curvature to determine the method is more simple and feasible, and faster. In order to obtain smooth Spline curve must be curve fitting, curve fitting interpolation and approximation two. Smooth curve approximation method used,[link widoczny dla zalogowanych], but the margin of error, therefore, must be based on comprehensive analysis of the actual part decided by the kind of fitting method. Reverse engineering module in the \Figure 5, the data read into the tool path diagram 6, the tool path data into spline-type defects have been obtained based on Spline curves, and then reverse engineering CAXA provided to Spline surface generation NURBS surface into a surface, the results shown in Figure 7 Fig. Figure 7 generates a prototype surface defects can be seen from Figure 7, the resulting surface is still flawed. Defects for many reasons, generally have their own original material defect measurement, measurement system errors defects, defects of its own measurement methods. Measurement of the defect depends on the level of the operator is not controllable factors, the other mainly by the elimination of software defects resolved. CAXA software reverse engineering module surface smoothing function can eliminate the measurement of very small defects, after smoothing the surface treatment shown in Figure 8. Figure 8 through the surface smoothing treatment of the surface must be noted that the curve must first be processed to generate a smooth surface, and then on the resulting surface smoothing treatment. Smooth surface will directly lead to a greater error. 3 Conclusion CNC profiling based on reverse engineering system has the following advantages: (1) low cost. For small and medium enterprises, if implemented by a large CMM reverse engineering, the cost of unbearable, and CNC profiling based on reverse engineering applications, the cost can be greatly reduced. (2) and high efficiency. High-speed milling machine,[link widoczny dla zalogowanych], spindle running speed of up to 20m/min, measurement of efficiency; integrated CAXA system easy to operate and process data faster. (3) easy to use. CAXA pure Chinese language interface software, the software system is simple and clear,[link widoczny dla zalogowanych], easy to use, users simply have general mechanical knowledge, after a short training, you can do the job. References 1 Xu Hefeng and so on. Digital mold manufacturing technology. Beijing: Chemical Industry Press, 2oo1.2 Italy Fidia Corporation. FidiaM1MENU. 1997.3 Beihang Haier Software Limited. CAXA manufacturing engineer practical manual. Beijing: Beijing University of Aeronautics, 20o0.

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