Aluminium alloy pouring process in aluminium sheet manufacturing

Aluminium alloy pouring process in aluminium sheet manufacturing

(i) Before pouring, check carefully the temperature of the aluminium alloy melt out of the furnace, the capacity of the pouring ladle and the dryness of its surface coating layer, and whether the preparation of other tools is in order. The metal pouring cup should be placed on the sand mould within 3-5 minutes before pouring, at this time the temperature of the pouring ladle is not higher than 150 degrees.

(ii) Can not be poured in the occasion of "passing wind", as well as the strong oxidation of the melt, burning, so that the aluminium plate castings produce defects such as oxidation inclusions.

(iii) When getting the melt from the crucible, use the bottom of the bag to gently pluck away the oxide or melt layer on the surface of the melt, slowly dip the pouring bag into the melt, scoop the melt with the wide mouth of the bag and then lift the bag smoothly.

(iv) Do not palm the ladle flat and take a steady step when you end the ladle, the ladle should not be lifted too high and the liquid level of the aluminium alloy in the ladle must be kept smooth and free from any movement.

(v) When pouring, the slag of the pouring ladle should be cleaned to avoid bringing slag and oxidation skin into the aluminium plate casting pattern.

(vi) in the pouring, melt flow on keep smooth, can not be interrupted, can not straight punch the mouth of the bottom hole. Pouring mouth wai from mother to end should be full, liquid surface shall not flip, pouring speed should be controlled properly. Usually, the pouring starts a little slower, so that the melt is filled smoothly, and then the speed is slightly faster, and the pouring speed is basically kept constant.

(vii) In the pouring process, the distance between the spout of the pouring ladle and the gate should be as close as possible, not exceeding 50 mm, to avoid excessive oxidation of the melt.

(viii) With blocked sprue wye, the blockage should not be plucked too early, after the melt has filled the sprue wye, then slowly and obliquely plucked out, so that the melt does not produce eddy currents when injecting into the sprue.

(ix) The aluminium alloy melt below 60 mm from the bottom of the crucible should not be poured into the casting.