Machining method for sprue bush cooling trough

The invention discloses a machining method for a sprue bush cooling trough. The machining method comprises the steps of calculating of the section area, the water flow rate and the like of the cooling trough, copper electrode designing, designing of an assistive device for installing a copper electrode, electrospark machining treatment, electrical sparkle slagging hole forming, annealing treatment, assembling before vacuum brazing treatment and vacuum brazing treatment. According to the machining method for the sprue bush cooling trough, the method for machining the cooling trough on a small-diameter sprue bush can be achieved, and the service life of the sprue bush is prolonged.