Twin-spindle vertical machining center is a machine tool with two sets of high spindles in the Z direction and adjustable spindle center distance in the X-axis direction on the headstock. The headstock mounted on the column moves up and down the Z-direction guide rail accurately to realize the movement of the spindle and to complete the Z-direction movement requirements of the workpiece processing. Due to the double spindle configuration of the main shaft component, the no-load and load of the Z-axis lead screw are doubled, so it is necessary to make a counterweight to balance the lead screw load. The balance system of the spindle box is the core part of the double spindle machining center, which directly affects the machining accuracy. Generally, to reduce the no-load torque and wear of the ball screw, and ensure the accuracy of the screw and the accuracy of the machine tool, it is necessary to balance the weight of the spindle box and spindle. In this study, the advantages and disadvantages of various counterweight technologies are compared, and the counterweight method suitable for this product is selected to ensure the accuracy of the machine tool.
In order to study the mechanical properties of aluminum alloy, this paper adopts the birth-death element method (BDEM) to numerically analyze the behavior of tensile cracking of aluminum alloy specimens. A finite element model was established using Abaqus, and the BDEM were set in the deformation region. The results show that the BDEM accurately simulates the cracking behavior of the aluminum alloy. The specimen began to fracture when the experimental time was 18 s. The maximum Mises stress during the whole tensile process is 445.3 MPa. Compared with the traditional mechanical experiments, this method can obtain the stress/strain data during the large-scale plastic deformation of the aluminum alloy before rupture, which provides data support for the design and optimization of aluminum alloy parts.
Buffer is an important safety protection device in the event of vehicle accident and its working stability directly affects the life of the occupants. Due to the influence of strain gauge size and other factors, the conventional experimental measurement data is not accurate enough. Moreover, the buffer experiment is disruptive and costly. In order to obtain more accurate data and reduce the experimental cost, finite element modeling method was used to carry out numerical calculation of aluminum alloy tubular buffer, and the energy absorption capacity and the fluctuation of crushing force were studied. A large amount of data and nephogram were obtained, which provided support for the in-depth study of the working principle of the buffer. The results show that with the continuous pressure of the indenter, the different parts of the aluminum alloy tube will undergo elastoplastic deformation and absorb energy continuously from the outside. Data analysis results show that the average crushing force is 2.625 kN. Although the stress distribution of pipe wall is more uniform, the fluctuation of crushing force is still very obvious. This study provides data support for the design and optimization of buffer parameters in automobile enterprises.
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