What is the forging temperature of aluminum alloy

Since the deformation resistance of aluminum alloys increases with the decrease of temperature, the increase rate is faster than that of carbon steel and low-alloy steel; in addition, when the die forging shop is too high or low, aluminum alloy forgings are prone to defects. Therefore, the aluminum alloy forging temperature range is narrow, especially the aluminum alloy with a high degree of alloying cannot be forged at too high or low temperature.

1) Reasonably determine the forging temperature range: The main basis for determining the aluminum alloy forging temperature range is its plasticity diagram and deformation resistance diagram. Forging aluminum alloys within a reasonable forging temperature range can obtain uniform and fine recrystallized structures and ensure the physical and mechanical properties of aluminum forgings.

2) Forging temperature range: The allowable forging temperature range of aluminum alloys is very narrow, generally within 120 degrees (the forging temperature range of carbon steel is about 500 degrees), and the forging temperature range of some high-strength aluminum alloys is even less than 100 degrees. For example, the temperature range of 7a04 super hard aluminum is 380-450 degrees, only 700 degrees.

When the aluminum alloy is higher than the allowable forging temperature range or the holding time is too long, it is easy to produce coarse grains, and it is easy to produce overburning, which may break the billet. When the temperature is lower than the allowable forging temperature range, various defects such as coarse grains and cracks are easy to occur in the forgings, and the deformation resistance is increased. The United States and Japan use a narrower forging temperature range for aluminum alloys, generally less than 55 degrees and no more than 85 degrees. For example, the initial forging temperature of 6061 aluminum alloy in the United States is 482 degrees, the final forging temperature is 432 degrees, and the temperature range is only 45 degrees; while the initial forging temperature of Japanese 6061 aluminum alloy is 480 degrees, the final forging temperature is 435 degrees, and the temperature range is only 45 degrees. In order to reduce deformation resistance, the final forging temperature should take the higher temperature. Therefore, the actual temperature range used is narrower.

In addition, due to the different striking speeds of various forging equipment and different thermal effects, the forging temperature is also different. For example, the forging temperature on the hammer is generally 20-30 degrees lower than the forging temperature of the press, and die forging is generally not used for high-alloyed aluminum alloys. Hammer forging.

Because the aluminum alloy forging temperature range is very narrow, and when heated to about 400 degrees, the color of the aluminum alloy does not change; the temperature cannot be judged with the naked eye. Heating aluminum alloys uses a thermometer to control the temperature and must be accurately controlled. For this reason, the furnace temperature and billet temperature measurement is very important and must be measured accurately. Therefore, radiation-type sensors are increasingly used to measure the surface temperature of the blank.