Research On The Manufacture Technology Of Plastic Profile Extrusion Die Based On Surface Reconstruction

With the wide application of plastic doors and windows in architecture industry in China, the technology development of extrusion dies was highly promoted. However, due to the lack of design, manufacture and testing experience, the design and manufacturing level lag behind a lot compared with foreign countries. Therefore, there are significant research values and urgent realistic meaning to study the technology of extrusion dies. Aimed at the difficulty of the traditional design of extrusion die, a new manufacturing technology of extrusion die base on surface reconstruction in reverse engineering is given in the paper. Some key technologies are studied deeply, which are data capture, probe radius compensation, data registration, surface reconstruction, etc.When the cavity of extrusion die is measured, the problem of probe radius compensation is studied, and the triangular net method is applied. The normal vector of each data point is calculated without reconstructing surface, and then realizing radius compensation with probe radius by going along normal vector. The method is simple, convenient and high accuracy. When the points of extrusion die are captured, many measurements are needed sometimes. In the paper, the registration method base on the three points is applied, m practical application, the method is simple, fast, effective. According to the manufacturing feature of extrusion die, the sweep surface is adopted to reconstruct surface which is formed by sweeping two cross-section curves along a profile curve.Finally, the most complicated part- neck section of extrusion die is manufactured by the method in the paper. The manufacturing procedure of the reverse engineering of extrusion die have been summarized, such as capturing data of neck section, compensating probe radius, data registration, CAD model reconstruction, simulating CAM and manufacture, etc. Application shows that, the manufacturing technology of plastic profile extrusion die which base on surface reconstruction technology has changed the traditional design pattern that depends on the drawing by hand, shorten the development period of extrusion die, improved the quality of the mould and the design and manufacture level of extrusion die in China.