Patent ID: 7770626
Filing Date: 2010-08-10
Classification: B22D

Abstract:
1. A method for spraying a release agent in a die casting machine including a fixed die plate, a movable die plate, a die composed of a fixed die secured to the fixed die plate and a movable die secured to the movable die plate, an electrically-powered clamping apparatus which drives with a servo motor a die opening/closing mechanism for moving the movable die plate, and a spray device provided with a movement device for moving a spray head, which is to spray a release agent or a heat retaining agent, from a stand-by position outside the die to an arbitrary position between the fixed die and the movable die, said method comprising the steps of: installing the spray device on the movable die plate or the fixed die plate such that the direction of the movement of the spray head from the stand-by position outside the die to a position between the movable die and the fixed die is perpendicular to the direction of movement of the movable die; setting a spray position between the fixed die and the movable die based on a preset spray distance and the thicknesses of the fixed and movable dies, said spray position being such as to ensure the spray distances between the spray head and the die cavity surface of each of the fixed and movable dies; moving the movable die plate in the die closing direction and, at the same time, moving the spray head toward the spray position and positioning the spray head at the spray position; stopping the movement of the movable die plate when it has reached a position which lies within the stroke of the movable die plate and at which the distance between the spray head and the die cavity surface of the movable die and the distance between the spray head and the die cavity surface of the fixed die both become equal to the spray distances, thereby positioning the movable die plate at that position; spraying a release agent from the spray head onto the cavity surfaces of the movable die and the fixed die; and moving the movable die in the die opening direction and, at the same time, retreating the spray head to the stand-by position.