The method of applying the principle of plastic mechanics to study the law of metal forming is called plastic analysis of metal forming. Its tasks are:
① Various mechanical solutions in the process of plastic forming are studied to analyze the distribution law of stress and strain in the deformation body, and determine the deformation force and deformation work, so as to reasonably select the equipment tonnage and die strength.
② The variation law of component strain and size in plastic forming process is studied, and the appropriate blank and reasonable intermediate blank shape are selected in order to achieve the desired shape of the component.
③ The effects of processing conditions such as temperature and strain rate effect on metal plastic processing resistance and the measures to improve metal toughness and reduce resistance are studied in order to obtain components with good performance.
The plastic analysis methods of metal forming mainly include principal stress method, slip line method, upper bound method, finite element method and so on; The commonly used experimental methods are apparent plasticity method and dense grid moire method.
It usually refers to metal sheet metal processing, that is, cutting tools are used to cut off the excess metal layer from the metal material (blank) or workpiece, so as to make the workpiece obtain a processing method with certain shape, dimensional accuracy and surface roughness. Such as turning, drilling, milling, planing, grinding, broaching, etc.
In metal technology, corresponding to hot working, cold working refers to the processing technology that causes plastic deformation of metal below the recrystallization temperature, such as cold rolling, cold drawing, cold forging, stamping, cold extrusion, etc. Cold working deformation resistance is large. While forming the metal, work hardening can be used to improve the hardness and strength of the workpiece, but the plasticity will be reduced. Cold working is suitable for machining metal auto parts with small section size and high requirements for machining size and surface roughness.
Automobile sheet metal processing industry is facing the pressure of reducing manufacturing costs year by year. In addition to seeking management improvement and change, technical innovation is also one of the important methods.
Therefore, sheet metal processing has innovated a new process.
This new sheet metal process achieves the purpose of reducing process, shortening construction period and reducing cost; The purpose of improving quality is achieved; It has its unique design and technology; It breaks through the design idea under the traditional technology; In addition, the deformation of the workpiece is small, and there is no need to reshape and polish before spraying.
Due to the characteristics of the new sheet metal process, advanced sheet metal equipment software support and design, laser cutting process and bending process.
Metal plastic forming is a process that uses the plastic properties of metal materials to make them have the required shape. After the forming process, the microstructure and properties of metal materials are improved. Generally, the components subjected to alternating load or poor stress conditions can meet the service requirements only through the plastic forming process. Plastic forming is a chip free forming method, which can make the workpiece obtain good streamline shape and reasonable material utilization. The plastic forming method can make the workpiece size reach high precision, and the automobile sheet metal parts have high production efficiency.
Plastic forming is divided into cold forming, warm forming and hot forming. The influence of temperature on material properties should be considered in warm forming, and the creep effect of material should be considered in hot forming. Metal plastic forming includes block forming, sheet forming and rolling (see plastic mechanics). All kinds of plastic forming are based on the premise that metal materials have plastic properties, need external force, have the influence of external friction, and follow the common laws of metalology and plastic mechanics.
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