Isothermal forging technology originated in the United States in the 1960s. It refers to the forging and forming of blank under relatively stable temperature. Isothermal forging is suitable for the precision forming of difficult to deform materials. Perer et al analyzed the die design and mechanical properties of AA5083...
The precision forging of involute gear originated in Germany. In the 1950s, because there were not enough involute gear processing machines, the Germans used EDM to process the forging die cavity and tried to process bevel gear by ingenious hot die forging. German BLW company first obtained the patent...
From the load stroke curve, it can be seen that the load change in the whole deformation process can be roughly divided into three stages: in the first stage, the metal is basically not deformed, the load is very small, and the rise is very slow; In the second...
As shown in the figure, the stress distribution is given when the reduction is 1.5mm, 3.0mm and 4.5mm respectively. At the initial stage of deformation, the maximum stress is mainly concentrated in the half shaft area and small end face, and the stress of the gear tooth is very...
The hot precision forging lubricant shall have the following advantages: (1) It has good lubricity in the forging temperature range. The forging temperature of bevel gear forgings is generally 800-1200 ℃, and the die temperature is generally 200-500 ℃. The lubricant should isolate the bevel gear forging from the...
The velocity field distribution in the deformation process directly shows the metal flow law during the final forging of half shaft gear. As shown in the figure, the velocity field distribution is given when the reduction is 1.5mm, 3.0mm and 4.5mm respectively. At the initial stage of deformation, the...
(1) During the precision forging of spur bevel gears, there are many factors that affect the metal flow behavior. In addition to the shape and size of the preform and the preform, there are also the upper die speed, the friction coefficient between the blank and the die, the...
As shown in the figure, the structure diagram of the final forging die for the half shaft gear is given. Since the final forging temperature is lower than the pre forging temperature, the tooth die is designed in the lower die, so the problem of too high temperature rise...
The research on spiral bevel gears and hypoid gears in foreign countries is early, develops rapidly, and is also very advanced in technology. It is in the leading position in the world in terms of manufacturing accuracy, fatigue strength and wear resistance, such as Germany, the United States, Japan...
When metal is heated in oxidizing atmosphere (air or furnace gas), it will react with O2, H20 or CO2 to oxidize the metal surface. The higher the temperature, the longer the heating time, the more serious the oxidation. After the steel is oxidized, a layer of oxide skin is...