The aluminum automatic casting process realizes the reproducibility of casting process and ingot quality, and the quality of aluminum products is stable.
The liquid level in the semi-automatic casting mold uses the buoy funnel at the lower port of the aluminum liquid guide tube of the distribution trough and the mechanical lever type of the buoy and the stopper to adjust the flow to control the liquid level. The level of the liquid is determined by the person and fluctuates. The liquid level in the automatic crystallizer adopts a laser measuring device and its automatic flow control system. The liquid level fluctuation is very small and can reach within ±1m, which can realize low metal level control.
The temperature of molten aluminum, casting cooling water flow, and casting speed of semi-automatic casting depend on the different alloys and ingot specifications specified in the process. The casting process is realized by manual operation buttons. The temperature of water, molten aluminum and casting speed are individually controlled, and they can be indicated on the console or The numerical value is displayed. The water flow (or pressure) and casting speed are basically the same from the beginning to the end of the casting, and the mold has no lubrication system.
Fully automatic casting technology, various casting parameters of different alloys and specifications (water pressure and flow, casting speed, molten aluminum temperature, liquid level, lubrication), as well as from the beginning, normal, end stage and transition stage of the casting, the computer realizes the fully automatic casting control.
The holding furnace used in the automatic casting technology is tilting, and the casting process is centrally controlled. The aluminum liquid level is controlled by a multi-link unit. The liquid level in the mold and the liquid level in the launder are equipped with laser measuring devices. The laser sensor has a microprocessor. The combination of measurement and processing systems can obtain very high accuracy values. The tilting flow of the holding furnace is controlled by the casting machine PLC. The stopper rod for measuring the liquid level in the crystallizer and controlling the flow of the liquid injected into the crystallizer is installed on the beam. The laser sensor is kept at a certain distance from the aluminum liquid level, and different aluminum liquids are in contact with each other. The beam is fixed on the distribution tank, and the same distribution flow is completed after casting. The slot is removed as an integral unit.
The casting control adopts PLC to control the entire casting process. The process parameter setting is menu-oriented, and the liquid level, lubricating oil volume, casting speed, cooling water flow rate, molten aluminum temperature, pulse water stop time, casting length, etc. in the computer menu will all be carried out according to the program. After the alloy, ingot specifications and casting parameters are selected, the equipment should be automatically inspected in series. After the inspection, the equipment is in the waiting state for casting. At the beginning, the liquid level adjustment maintains the starting position, the liquid level in the mold is injected to the starting point of the curve, and the lifting platform of the casting machine starts to drop at the beginning speed, or spray pulsed water. When the pulse water stop length and time are reached, it will automatically switch to the normal casting stage, and the parameters (liquid level, casting speed, cooling water volume, etc.) will be automatically carried out. When the casting length reaches a certain distance from the preset point, an audible and visual alarm will be issued, and the stage will be ended. Parameters proceed. When the ingot length reaches the set point, the platform stops descending, the tilting holding furnace returns to the original position, the stopper rod closes the aluminum liquid port of the distribution trough, and one end of the distribution trough is lifted, and the remaining molten aluminum flows out of the distribution trough and is distributed after being cleaned. The runner is removed together with the stopper, and the casting is over. Fully automatic process control reduces the quality impact caused by human operation factors.
