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Analysis method of deformation force of forgings

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Analysis method of deformation force of forgings

Release date:2019-03-04 Author: Click:

Analysis method for deformation force of ring forgings

Forging is produced under the action of external forces, therefore, the correct calculation of deformation force, is the basis for the selection of equipment, mold check. The analysis of stress and strain inside the deformation body is also indispensable for optimizing the process and controlling the microstructure and properties of the forging.

There are four main methods for analyzing deformation forces. Although the principal stress method is not strict, it is simple and intuitive and can calculate the total pressure and the stress distribution on the workpiece and tool contact surface. The slip line method is strict for the plane strain problem of forgings, and it is intuitive to solve the stress distribution for the local deformation of high pieces, but its application range is narrow.

The upper bound method can give the overestimated load and the upper bound element can predict the shape change of the workpiece when it is deformed. The finite element method can not only give the change of external load and workpiece shape, but also give the distribution of internal stress and strain. Recently, there is a tendency to use joint methods to analyze problems, such as upper bound method for rough calculation and finite element method for fine calculation in key parts.

Reduce friction, not only can save energy, but also can improve the life of the mold.

Since the deformation is relatively uniform, it is helpful to improve the microstructure and properties of the product. The lubricants used are also different due to different forging methods and working temperatures. Glass lubricant is mainly used in high temperature alloy and titanium alloy forging. For hot forging of steel, water-based graphite is a widely used lubricant. For cold forging, due to the high pressure, phosphate or oxalate treatment is required to go forward and backward.


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