Continuous Metal Casting
Apparatus and method of metal castings utilize a die having at least one helical rib or channel surrounded by a cooler which cooperates with a means for imparting a relative screwing motion, such as a pair of rollers at an angle to the longitudinal member which is being cast, to screw a helically shaped metal member continuously from the die.continuous casting which includes a molten metal receiver, a fixed die having at least one helical rib or channel and surrounded by a cooler and a means for imparting a screwing motion to the partly solidified metal member formed in the die so as to withdraw the member from the die.
Secondly the invention provides a process of continuous casting which includes maintaining molten metal in a receiver, partly solidifying the molten metal in a die having at least one helical rib by cooling the die to give a metal member and withdrawing the metal member from the die whilst imparting a screwing motion to the metal member.
The helix angle of the helical rib and the direction of the screwing motion should be matched so that the solidifed shell of the member moves peripherally in the direction of the helical rib. In this way member can be withdrawn without damaging the die, which is generally of graphite.
The die is advantageously secured to the receiver. The cooler may be cooled with water under pressure and may have an inner wall adhered to the die with varying tolerances. A gap may be provided between the die and the inner wall so as to retard cooling where appropriate. The die may include a mandrel so as to form a hollow member. The mandrel may be the part of the die with the helical rib.
Suitably a centering device is provided downstream of the die so as to hold the longitudinal axis of the member in line with that of the die.
The means for imparting a relative screwing motion are provided externally of the die and may act continuously or with interruptions. The means may include rollers for engaging in the helical groove formed by the helical rib of the die in the member. Advantageously a pair of rollers is used arranged on opposite sides of the member to engage diametrically opposite portions of the member and arranged at the same helix angle. One of the rollers may be driven in response to a control system to withdraw the member at a rate consistent with the rate of metal solidification whereas the other roller is connected so as to press the member against the drive roller. Conveniently the drive roller is adjustably mounted to ensure that it is at the desired helix angle and a limited float capacity is provided for thermal contraction of the member.
Precision Casting Products
Supply high quality castings for automobile, marine and railroad system.
Supply high quality castings for automobile, marine and railroad system.
Supply high quality castings for automobile, marine and railroad system.
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