The application research of automobile forgings in lightweight design is to reduce vehicle weight, improve fuel economy and reduce carbon dioxide emissions. In automobile manufacturing, forgings, as a common component material, have high strength and stiffness, and are widely used in key parts such as body and chassis. The following is the main application research direction of automotive forgings in lightweight design: Material selection and optimization: The primary task of lightweight design is to select the right material and optimize it accordingly. For automotive forgings, common materials include aluminum alloy, magnesium alloy and high-strength steel. The researchers selected the best combination of materials by evaluating factors such as strength, density, machinability and cost of different materials. Structural design optimization: In the process of structural design of forging, it is necessary to consider the interaction between different parts and their forces. By applying optimization algorithm and simulation technology, the lightweight design and strength analysis of the structure can be realized. For example, optimized geometry, hole layout and wall thickness distribution are used in the design of forgings to minimize weight and maintain the stiffness and strength of the structure. Manufacturing process improvement: In the manufacturing process of forgings, by improving process technology and equipment, the manufacturing accuracy and efficiency of forgings can be improved, and the waste of materials can be reduced. For example, the use of advanced technologies such as hot forming, precision cold forging and heat treatment can realize the control of material properties and microstructure, thereby improving the mechanical properties and durability of forgings. Multi-material combination and composite structure design: Another important direction of lightweight design is to achieve partial or partial weight reduction through multi-material combination and composite structure design. For example, in the design of automobile body, materials such as aluminum alloy, high-strength steel and composite materials can be optimized to make different parts have different strength and stiffness to achieve the overall lightweight effect. In short, the application research of automotive forgings in lightweight design aims to realize the lightweight of automotive vehicles, improve fuel economy and reduce environmental pollution through the exploration of material selection and optimization, structural design optimization, manufacturing process improvement and multi-material combination and composite structure design.