In order to ensure the machine tool casting quality, increase productivity and achieve safety in production, when pouring, should strictly abide by the operation requirements:1, pouring should be timely to light gas from gas in the mould, lest produce blowhole, due to mould your breath and harm human health due to the incomplete combustion of the gas and pollute the air. 2, the correct selection of casting speed, slowly at the beginning of casting, facilitate alignment gate, reduce molten metal on the impact of the sand mould and conducive to gas discharge;Then rapid casting, in order to prevent the cold insulation;Casting full before and then slowly pouring, that is, follow the principle of slow, fast and slow. 3 before furnace, ladle, pouring tools, processing with the inoculant, spheroidizing agent before use must be fully dry, dry before use. 4, pouring personnel must wear good clothes, according to the requirement and wear protective glasses, work place should be unimpeded.The metal liquid inside the ladle shoulds not be too full, so as to avoid overflow hurt when transporting and pouring. 5, lost wax casting for liquid contraction and solidification shrinkage is a big machine tool castings, such as medium and large steel casting, casting lost wax casting remind to timely from gate or mouth watering.