The plasticity of metal is related to temperature. The higher the temperature, the better the plasticity of metal. For forging, the better the metal plasticity, the easier it is to form the spiral bevel gear blank. However, when the temperature is too high, the blank metal is easy to be oxidized to form an oxide layer. After the spiral bevel gear forging is formed, it needs to be machined to remove the oxide layer, resulting in material waste. Therefore, as an important parameter of precision forging, the forming temperature of spiral bevel gear will have a great impact on the quality and processing cost of forgings. The appropriate processing temperature is very important to the forging process.
The research object of this group of experiments is the forming temperature of spiral bevel gear. The precision forging characteristics of automobile rear axle driven spiral bevel gear at various temperatures of cold processing, warm processing and hot processing are studied respectively. The cold processing forging temperature is set at 20 ℃, the warm processing forging temperature is set at 300 ℃, 400 ℃, 500 ℃, 600 ℃, 700 ℃ and 800 ℃ respectively, and the hot processing forging temperature is set at 900 ℃, 1000 ℃, 1100 ℃ and 1200 ℃ respectively. The blank with inner diameter of 125 mm, outer diameter of 175 mm, height of 33.5 mm and upper surface cone angle of 18 ° was selected for experimental research.
During the simulation experiment, the main parameter settings of the DEFORM-3D pretreatment interface are basically the same. After the blank and the upper and lower molds are imported, the preheating temperature of the upper and lower molds for cold processing is set to 20 ℃, the preheating temperature of the upper and lower molds for warm processing and hot processing is set to 300 ℃, the forging temperature of spiral bevel gear is set according to the temperature required for each group of experiments, and the blank grid division is set to 100000, The friction coefficient is set as cold working friction coefficient 0.12, warm working friction coefficient 0.25 and hot working friction coefficient 0.3, and the movement speed of the upper die is set as 12.5 mm / s. After the setting is completed, the data file is generated and simulated.