3 Piece Forged Wheels Process Requirements
3 Piece forged Wheels Process requirements
Forging according to steel and process requirements are different, often using the following heat treatment methods: annealing, normalizing, quenching and tempering, quenching and low temperature tempering, quenching and aging. Then we look at how specific it is:
Forging annealing process has a complete annealing, spheroidizing annealing, low temperature annealing and isothermal annealing and other forms, according to the forging material and deformation to select.
After the annealing of the forging, the recrystallization finishes the grain, eliminates or reduces the residual stress, thereby reducing the hardness of the forging, improving its plasticity and toughness, and improving the cutting performance.
Normalizing is generally the forging heated to the GSE line above 50-70 ℃, some high alloy steel forgings heated to the GSE line above 100-150 ℃, after proper insulation and then air cooling. Such as normalized aftergings for a higher hardness, in order to reduce the hardness of forgings, but also should be high temperature tempering, the general tempering temperature of 560-660 ℃.
3. Quenching, tempering:
Quenching is to obtain unbalanced tissue to improve strength and hardness. The steel forgings are heated to above the Ac1 line at 30-50 ° C. After the cold quenching.
Tempering is to eliminate the quenching stress, get a more stable organization, the forgings heated to Ac1 line below a certain temperature, heat for some time, and then air-cooled or cold.
4. quenching, aging:
High temperature alloys and alloys that can be reinforced by heat treatment are often subjected to quenching aging treatment after forging. Quenching is to heat the alloy to the appropriate temperature, the full insulation, so that some of the alloy structure of the alloy dissolved in the matrix to form a uniform solid solution, and then quickly cooled to become supersaturated solid solution, it is also known as solution treatment. The aim is to improve the plasticity and toughness of the alloy and to prepare for further aging treatment. Aging treatment is the supersaturated solid solution or cold deformation after the alloy placed at room temperature or heated to a temperature, heat for some time, so that the previously dissolved in the matrix of the material, evenly dispersed precipitation. The purpose of aging treatment is to improve the strength and hardness of the alloy.
Forging heat treatment is carried out according to certain heat treatment specifications, according to the forging steel, section size and technical requirements, and refer to the relevant manual and data. Its contents include: heating temperature, holding time and cooling methods. Generally used temperature - time curve to represent. Forging in the preparation before the forging, including raw material selection, calculation, cutting, heating, calculate the deformation force, select the equipment, design mold. Forging before the need to choose a good lubrication methods and lubricants. Forging materials involved in a wide range, both a variety of grades of steel and high temperature alloys, and aluminum, magnesium, titanium, copper and other nonferrous metals; both after a processing into different sizes of bars and profiles, there are a variety of Specifications of the ingot; in addition to a large number of domestic materials suitable for China's domestic materials, but also from foreign materials. Forging materials are mostly included in the national standard, there are many developed, trial and promotion of new materials. As we all know, the quality of forgings products are often closely related to the quality of raw materials, so for the forging plant workers, must have the necessary knowledge of the material, to be good at the process requirements to choose the most suitable material.