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Analysis of mechanical properties of spring generated by spiral scanning under pro/e

in this paper, the static analysis and modal analysis of the entity generated by spiral scanning are carried out through pro experiment with experimental data/mechnica, and compared with the theoretical calculation results of compression spring. It is proved that the entity of spiral scanning is very close to the actual spring in mechanics

in structural design, thermosetting plastics (such as bakelite powder) and condensing plastics (such as epoxy resin + curing agent) are used as fillers. Springs are widely used. In order to truly and accurately reflect the structure, designers generally use spiral scanning to generate entities to describe springs in pro/engineer. The shape of the spring thus obtained is very close to the actual spring which successfully held the second meeting of the equipment group of the Sino Russian Industrial Committee. However, there is no final conclusion about the difference between the mechanical properties and the actual spring, and whether the simulation can reflect the working state of the spring. Using pro/mechnica module of pro/engineer, this paper analyzes the load deformation of compression spring, calculates the natural vibration frequency, and compares it with the theoretical calculation results

1. Create a model of the compression spring

the example described in this paper uses spiral scanning to generate an entity and simulate the spring. The spring has a length of 60mm, a pitch diameter of 30mm, a material diameter of 5mm and a pitch of 10mm. Here, two flat plates can be added to the upper and lower end faces of the spring to add constraints and loads under pro/mechnica. The model is shown in Figure 1

Figure 1 spring model

II. Static analysis of compression spring

here, the pro/mechnica module can be used to conduct static analysis of the model. First, create a new static analysis. The loads and constraints are shown in Figure 2. Then fully constrain the 6 degrees of freedom of the lower plate of the spring, and apply a 1000N load to the upper plate. The spring deformation is shown in Figure 3. The deformation is 12.1mm

Fig. 2 spring load and constraint Fig. 3 spring deformation

III. modal analysis of compression spring

here we can use the p ro/mechnica module to perform modal analysis on the model. Create a new modal analysis without adding constraints and loads. The results are shown in Figure 4. The natural vibration frequency of the spring is 17s-1,

IV. theoretical calculation of the compression spring

the formula for design and calculation of the cylindrical spiral compression spring is:

the formula for resonance checking is:

where f is the deformation under the working load (mm), n γ Is the natural vibration frequency of the spring (Hz), f is the working load (100N), n is the number of effective coils of the spring is 9, G is the shear modulus (71000mpa), C is the winding ratio, C = D/D, D is the spring pitch diameter (200mm), D is the material diameter (16mm)

Figure 4. The results of modal analysis after the development in recent 10 years

through simulation and calculation, the result is: F = 12.4mm

it can be seen that they are very close to the results obtained by using pr o/mechnica simulation

v. conclusion

by comparing the results calculated by pro/mechnica and the theoretical formula, it can be found that the entity obtained by spiral scanning is not only very close to the actual compression (tension) spring in shape, but also very close in mechanical properties, so it can be used to simulate the compression (tension) spring in static and working states with confidence

originally published in cad/cam and manufacturing informatization (end)

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