How to use fastform to correctly simulate sheet me

2022-08-12
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How to use fastform to correctly simulate the forming of sheet metal deep drawing parts

deep drawing method has been widely used in various product manufacturing because of its high production efficiency, low material consumption, high strength, stiffness and precision of processed parts. This paper correctly simulates the forming of sheet metal drawing parts by using fastform software, and introduces the advantages and application characteristics of fastform software. It is hoped that the emergence of plastic forming simulation software can provide great help to engineers

deep drawing is a stamping process that uses a drawing die to make a flat blank into open hollow parts of various shapes under the pressure of a press. Deep drawing is also called drawing, stretching or drawing

due to the high production efficiency, low material consumption, high strength and stiffness of parts, and high machining accuracy of thin-walled hollow parts manufactured by the method of deep rotation direction of puller, deep drawn parts have been widely used in aviation, automobile, instrument, light industry and civil products. The drawing process can be used to make rotating parts such as cylindrical, stepped, spherical, conical and parabolic, as well as non rotating parts such as square box. If the drawing is combined with other forming processes (such as bulging, flanging, etc.), parts with very complex shapes, such as car doors, can be processed. It can be seen that deep drawing has a wide range of applications and is one of the basic processes of cold stamping

in the process of deep drawing, the plastic deformation law of materials, the friction phenomenon between die and workpiece, the changes of temperature and microstructure in materials and their impact on the quality of parts are all very complex problems. This makes the plastic forming process and die design lack of systematic and accurate theoretical analysis means, and mainly rely on the long-term experience of engineers. For complex forming processes and dies, the design quality is difficult to guarantee. In addition, some key parameters can only be determined through repeated debugging and modification after mold design and manufacturing, which wastes a lot of manpower, material resources and time

with the development of computer simulation technology, the emergence of a large number of plastic forming simulation software has provided great help to engineers. Fastform is one of them. It has the advantages of fast analysis speed, friendly operation interface and accurate analysis results. Taking fastform as an example, this paper introduces how to use analysis software to simulate sheet metal plastic forming

fastform can read IGES, step, fti/fpo, Lin, NASTRAN or vdafs files, as shown in Figure 1

Figure 1 fastform operation interface

at this time, you need to select the correct materials. Fastform's material library is open, and you can add, modify and delete the relevant functions of the electronic universal experimental machine at will. All parameters are checked to ensure that the correct material is selected, as shown in Figure 2

Figure 2 choose the right material

fastform has a good geometric repair tool, which can be used for the read CAD model and become the model needed for analysis

fastform's automatic lattice division function can be used without engineers' experience in finite element analysis. The automatically divided lattice conforms to the characteristics of sheet metal plastic forming process. At the same time, its advanced function allows engineers to repair the lattice. Just set the maximum size and minimum size of the lattice. Fine ceramics have good acid and alkali resistance, and the insulation performance can complete the lattice division within 1 minute, as shown in Figure 3

Figure 3 grid division

after the grid division is completed, the stamping process needs to be set, and the settings of drawbead, blank holder force, pressure pad, stamping direction and rough embryo can be completed in the software, as shown in Figure 4

Figure 4 set the stamping process

calculate after the setting is completed. Generally, the calculation results can be obtained within 5 minutes, and the more complex parts often do not exceed 10 minutes. The results obtained include the hair embryo of the drawing part, the thickness change of each part, the torn and wrinkled parts and the stress condition, as shown in Figure 5. It must comply with the provisions of the standards of coherent experimental methods

Figure 5 calculation results

if you need to analyze the springback condition and the drawing of weldments, you can continue to analyze them in advanced functions, and generally the analysis results can be obtained in no more than 10 minutes. The results of springback can be displayed in any scale, as shown in Figure 6

the above is a simple process introduction of using fastform for analysis. Generally speaking, even if there are formed parts with different materials welded together, fastform can also carry out some simple analysis

Figure 6 springback results

fastform also achieves seamless integration with 3D design software such as SOLIDWORK and CATIA. Engineers can complete the analysis process of deep drawn parts in the CAD environment

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