3 Tool position calculation of 5-axis linkage machining blade
3.1 Determination of blade machining position
Usually, the processing position of the blade on the machine tool is not the aforementioned geometric modeling position. The blade must be transformed to the processing station according to the specific machine structure and clamping method. Since the blade shape is a complex sculpture curved body, the sand casting blank is processed before processing. Moreover, the turbine blades are very heavy. How to use the software to solve the clamping is an important step. Here, the Translate and Rotate functions in Edit/Transform are used to transform the blades into machining. The position of the station and the machine coordinate system are set according to the specific conditions of the machine.
3.2 Axis linkage machining tool position calculation
In the machining process, the blade machining process is usually based on the blade machining location, the machine type and the cutting parameters of the tool. According to the balance distribution and the NC milling head function of the machine tool, each face of the blade is generally divided into several initial milling. And one finish milling. The specific conditions of each machined surface are different, and the method of controlling the tool axis vector is also different. UNIGRAPHICS has a variety of tool axis control methods for surface machining.
From the perspective of processing efficiency and blade characteristics, face milling is generally used for face milling. Face milling cutters of the same diameter can be used, and face milling cutters of different diameters can be used for sub-area milling to improve machining efficiency. Face milling cutter, Iofo/Curvature→Surface can be used to analyze the curvature of the surface, and the tool diameter can be selected according to the distribution of curvature.
According to the rationality of the machining, the rough and fine milling machining program should be programmed separately. The cutting parameters for roughing and finishing are different in the Step Method and Gouge Check areas, but they all use Paramenter. Line (parameter line). When calculating the roughing position, divide the blade surface from the upper crown to the lower ring into two or three areas, with different diameter face milling cutters for different areas, and Gougecheck off for larger curvature areas. A smaller diameter face milling cutter may be used for areas where the curvature or radius of curvature ratio is larger, and a Step of points and a Gouge check on for the Step Method. Roughing gives the stock of each layer, using the same diameter knife for finishing, and Stepping and Scallop Ht Method for stepping and Scallop Ht Method for the residual height. .
4 small knots
(1) In the complex design of parts, the data processing capacity is large. Using AutoCAD to do the preliminary work of design, a large number of data input and processing tasks can be placed on the general microcomputer, which can greatly save the enterprise cost.
(2) Using the AutoCAD function function to read in the spatial points of the blade measurement, when the B-spline curve is respectively made in AutoCAD according to the spatial section line, the obvious bad points should be eliminated, and the smoothing of the curve is entered after UNIGRAPHICS.
(3) The spatial point measured by the blade is actually the value point on the B-spline interpolation curve. In the UNIGRAPHICS, the 3-time B-spline curve of the over-type point is much smoother than the 5-time B-spline curve, not It is generally believed that the higher the order of the B-spline curve, the smoother the curve and the more careful the processing.
(4) When constructing a B-spline surface, for a profile with more than 25 cross-section curves, a multi-patch is used to construct the surface. This solves the problem of smooth transitions in surface boundaries.
(5) In the process of establishing the blade, the tolerance values ​​required to establish the spline and the surface stitching must be preset. When sewing, the error value needs to be adjusted if necessary to ensure the smooth operation.
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