Aluminum casting process specification

[China Aluminum Network] 1 Subject and Scope This regulation specifies the technical requirements and operating specifications of the casting production process.

This procedure applies to smelting, casting, and homogenous production of extruded aluminum.

2 Preparation before Production 2.1 Check if the oil level of the oil storage tank reaches a lower value, whether the burner and oil gun are normal, whether the furnace door is open and whether the sealing of the furnace door is good.

2.2 Check the casting platform, water supply system is normal.

A) Check whether the heat insulation material, mold, ejector head, runner, etc. of the casting platform are in good condition, and install the ceramic filter plate or filter cloth.

B) Before each casting, the water must be tested to the normal casting water volume of the casting machine. Check whether the spray angle of the crystallizer water outlet ring is good, whether the water curtain is formed and whether the overflow hole is leaking, and the overflow hole must not be cast. If there is a blockage, remove it immediately and remove any debris.

C) The dummy seat must be raised to the normal starting position and leveled before casting.

D) If the casting machine is not used for a long time or the weather is wet due to the rust of the susceptor, the lint must be applied once before casting.

E) Casting water must be filtered through less than 1 MM. The water temperature for casting water should be less than 40 degrees Celsius.

2.3 The smelting furnace shall be suspended for more than one month or a new furnace.

2.3.1 Oven First open the furnace door and the water outlet with a wood fire ignition oven to prevent the fire, according to the furnace temperature and the size of the fire at any time to adjust the size of the furnace door to open, control at 150 degrees Celsius, the heating rate is not greater than 10 Celsius/H; after two days, the temperature of the furnace is raised to 250 degrees Celsius from 10 degrees Celsius. After vaporization of water vapor, it is heated and baked with a small burner. After four days, it is bake with two small burners. The temperature rise is 15 degrees Celsius/H. At 500 degrees Celsius, after five days, the temperature rose to 600 degrees Celsius. After six days, the temperature was raised to 800 degrees Celsius at a rate of 16 degrees Celsius per hour. The temperature was maintained for more than 10 hours and the oven was terminated.

2.4 The ratio of preparation 2.4.1 alloy is performed according to HD/QB-2004 "Internal Quality Control Standard".

2.4.2 The smelter will use the ingredients, smelting, casting, and chemical analysis results record form filled in by the batcher as the ingredient instruction to infuse aluminum ingots, magnesium ingots, aluminum-silicon alloys (or metal silicon), metal additives, and profile scraps. Extrusion press residue, fused cast saw head, large lumps of aluminum in the hopper, remelted aluminum ingots, etc. were metered and then transported in batches to the furnace operation platform, and corresponding records were made.

2.4.3 Covering agent, refining agent, and slagging agent are dried and used as backup.

2.4.4 All charge materials are not allowed to be exposed to rain, moisture, or mixed with other materials, and are not allowed to mix with other metals.

3 Melting 3.1 Furnace 3.1.1 When the temperature of the furnace rises to 800 degrees Celsius, the aluminum water outlet is plugged and the furnace door is opened to start feeding.

3.1.2 When feeding, first use the same profile number of short profile waste to lay the bottom, put the short profile (preferably tied into bundles) waste from the furnace door into the furnace in order to protect the furnace bottom. Then put aluminum ingots to the furnace door.

3.1.3 When there is no scrap bottom in the furnace, large metal materials such as aluminum ingots must not be put in order to avoid damaging the bottom of the furnace. The metal should be cast in the middle of the furnace when feeding, so as not to block the combustion port or damage the furnace wall.