Traditional ways of making molds for hydraulic torque converter blades were first introduced in brief. Improvements on traditional ways through CAD/CAM technology were discussed. A new way was then brought forward making use of the work wheel in the torque converter's mould. The method in producing blade molds by NC machine tools gets the program from virtual modeling in computer directly. These methods were described in more detail, and the merits and defects of each method were given by comparison.
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