The difference of the cold and hot chamber die casting machine
Die casting is a metal mold casting on the die casting machine, casting process is the highest production efficiency.Die casting machine is divided into hot chamber die casting machine and cold chamber die casting machine.Hot chamber die casting machine high degree of automation, less waste of materials, the production efficiency is higher than cold chamber die casting machine, but the restriction of the parts heat resistant ability, it is only used in zinc alloy, magnesium alloy and other low melting point materials of casting production.
Today's widely used aluminum alloy die casting, due to the high melting point, only in the cold chamber die casting machine for production.The main characteristics of die casting is a metal mold filling under high pressure, high speed, and forming and solidification under high pressure, the deficiency of die casting is: because the liquid metal under high pressure, high speed of mold filling process, inevitably, the clip wrapped inside the casting, the air in the cavity formed subcutaneous blowhole, so you should not heat treatment, aluminum alloy die casting zinc alloy die casting is unfavorable surface plastic but can spray paint.Otherwise, when heated, internal porosity in the casting processing will meet thermal expansion and deformation of the casting or bubbling.
In addition, the die casting machine cutting machining allowance should be made smaller, generally at about 0.5 mm, can reduce the casting weight, cutting processing capacity to reduce costs, and can avoid penetrates the surface dense layer, subcutaneous blowhole, cause the workpiece scrapped.Die-casting machine generally divided into two major categories of hot pressing chamber die-casting machine and cold chamber die casting machine.Cold chamber die casting machine according to the pressure chamber structure and layout methods are divided into horizontal die casting machine and vertical die-casting machine including all vertical two kinds of die-casting machine.