The explanation of aluminum alloy forging process is as follows: I. The narrow temperature range is due to the fact that the deformation resistance of aluminum alloy increases with the decrease of temperature. The growth rate is faster than that of carbon steel and low-alloy steel; In addition, if the forging workshop is too high or too low, aluminum alloy forgings are prone to defects.
1、Therefore, the forging temperature range of aluminum alloys is relatively narrow, especially for aluminum alloys with high alloying degree, which cannot be forged at excessively high or low temperatures.
2、 Accurate measurement of heating temperature: Due to the narrow forging temperature range of aluminum alloy, the color of the aluminum alloy remains unchanged when heated to around 400 degrees; It is impossible to judge the temperature with the naked eye. Therefore, it is necessary to use a thermometer to control the heating temperature of aluminum alloy during forging. And it must be carefully controlled. Therefore, measuring the temperature of the heating furnace and steel billet is very important and must be measured accurately. Radiation sensors (infrared) are increasingly used to measure the surface temperature of billets.
3、 Good thermal conductivity, but long heating and insulation time. Due to the complex phase composition of aluminum alloy, in order to ensure sufficient dissolution of strengthening phases, its heating and holding time is longer than that of ordinary carbon steel, and the degree of alloying is higher. The longer the insulation time. Reasonable heating and holding time can improve the plasticity of aluminum alloy and enhance its forging performance. Aluminum alloys with insulation time four times longer than carbon steel and no oxide skin will not produce loose oxide skin when heated, but the product will produce an oxide film.
4、 The cold shrinkage rate of aluminum alloy is smaller than that of steel, generally taken as 0.6%. Steel is generally taken as 1% to 1.5%. The characteristics of aluminum alloy forging process require corresponding measures to be taken in forging process and mold design. Although the ductility of aluminum alloy is inferior to that of carbon steel and low-alloy structural steel, as long as the forging temperature of the aluminum alloy billet is reasonable, the low mold roughness, good lubrication, and good mold preheating conditions are optimized, the ductility of deformed aluminum alloy and the precision forging of complex shapes can be greatly improved。
