Preparation method of composite binding agent diamond grinding wheel

The invention discloses a preparation method of a composite binding agent diamond grinding wheel. The method includes the steps of firstly, mixing, by weight, 1-2 parts of phosphorus powder, 10-15 parts of polyimide resin powder, 8-10 parts of tin powder, 35-40 parts of copper powder, 9-11 parts of lead powder and 2-4 parts of zinc powder, and then sieving with a 325-mesh standard sieve to obtain composite binding agent; secondly, mixing, by weight, 10-14 parts of diamond grinding material and 25-45 parts of composite binding agent in a mixing machine, adding, by weight, 1.5-2 parts of acrylic emulsion to continue mixing, and sieving with a 70-mesh standard sieve to obtain grinding wheel mixture; thirdly, placing a steel substrate in a die, filing the grinding wheel mixture in the die, and hot pressing in a hydraulic machine to obtain grinding wheel blank; fourthly, sintering the grinding wheel blank in a sintering furnace; fifthly, machining the sintered grinding wheel blank on a lathe and a grinding machine to obtain the fished composite binding agent diamond grinding wheel. The diamond grinding wheel prepared by the method is high in grinding efficiency, good in self-sharpness, high in rigidity, high in heat resistance, and good in profile maintaining.