Abstract: In order to increase the precision of the mold for powder metallurgy gears, use the CNC form grinding technique with a plate-shaped grinding wheel to produce the mold. A line-cutting model for calculation is put forward for the profile calculating. After transferring the known profile to the plane for calculation, use a numerical simulation method to calculate the profile of the grinding wheel. A profile calculating, profile editing and error analyzing software is also programmed. The calculating and error analyzing example of a mold that z is 44, mn is 1.5 mm, a is 20° and b is 30° using this software shows that the calculating error can be under 0.000 1 mm and the method is precise enough to meet the requirements of high quality gear molds.

Key words: Form grinding, Numerical simulation, Powder metallurgy