Views: 54 Author: Site Editor Publish Time: 2023-08-22 Origin: Site
The four-roller plate rolling machine is a non-standard heavy machinery equipment necessary for the mechanical equipment manufacturing industry, especially for container manufacturing enterprises. It is mainly used to roll different types (materials) of steel plates into cylindrical mechanical parts according to design and manufacturing requirements. Belongs to plastic molding machinery and equipment. Since the four-roller plate rolling machine needs a large torsional moment in the process of rolling the plate, the safety design of the transmission parts is particularly important.
The transmission parts of the four-roller rolling machine are mainly used to provide rotating torque for the work rolls on the four-roller bending machine. The transmission parts are mainly composed of half couplings, component sleeves, connecting plates and connecting pins, as shown in Figure 1. The design of the connection plate needs to consider that there is a sufficient safety factor under the working load. Because the structural form of the connecting plate is different from the conventional one, the method of elastic mechanics cannot be fully applied to obtain an accurate analytical solution. At the same time, the stress concentration of the connecting plate is easily ignored during the finite element simulation of the connecting plate, resulting in the shaping of the connecting plate Deformation or fracture damage.
Optimal design is a technique to find and determine the optimal design plan. The so-called optimal design refers to a scheme that can meet all design requirements, and has the least weight, stress, cost, etc., and the processing difficulty is relatively low. For the purpose of reducing the stress concentration of the connecting plate and meeting the production and processing needs of the enterprise, three optimization schemes are determined, as shown in Figure 2, and the design parameters of the corresponding optimization scheme are shown in Table 1.
⒉Optimization analysis model
Because the establishment of the analysis model, the division of the grid, the determination of the boundary conditions and other factors have a great influence on the structure of the optimization analysis, especially the selection of the boundary conditions for the optimization analysis of the transmission connection plate alone is difficult, and the processing of the boundary conditions is inaccurate The results of the optimization analysis are bound to be unavailable, so the model of this optimization analysis selects the transmission parts of the entire four-roll plate rolling machine. The material model and parameters selected in the optimization analysis are shown in Table 2.
⒊Selection of optimal analysis boundary conditions
For the optimization analysis of the roller transmission parts of the four-roller plate rolling machine, the displacement of the six directions in the end surface of the upper roller is simulated, and a driving torque of 533t · mm is applied at the driving end. The contacts applied during the establishment of the analysis model are as follows: 8 standard contact methods between the connecting plate and the transmission parts in the half coupling are applied, the friction coefficient is 0.3, and the contact between the connecting plate and the transmission parts in the half coupling is simulated Status; 2 standard contact methods between half coupling and half coupling transmission parts are applied, friction coefficient is 0.3, which simulates the contact state between half coupling and half coupling transmission parts; half is applied The bonds contact mode at the coupling 2 has a friction coefficient of 0.3, which simulates the contact state between the half coupling and the sleeve. The processing of meshing and boundary conditions is shown in Figure 3.
⒋Optimal analysis results of transmission connecting plate
In the three schemes, the maximum stress in the transmission parts occurs at the inner corners of the transmission connection plate, and as the corners increase, the stress has a tendency to decrease, as shown in Figures 4-6. Scheme 3 is based on the previous two schemes and is the best of the three schemes. The maximum stress is 580.104 MPa, which is less than the yield stress of the material 30Cr2Ni2Mo, which is 835 MPa, and the safety factor is greater than 1.4. See Table 3 for details.
⑴The finite element is used as the analysis method to optimize the design of the transmission connection plate. Under the premise of ensuring the strength requirements, the optimized structural design of the transmission connection plate is more reasonable.
⑵ Using the method of analyzing and comparing schemes, you can quickly lock the optimal design scheme and find the design rules from it. Especially in the design of series products, this method can maximize the design efficiency and design perception.