Papers by Keyword: Rolling Shear

Abstract: The article proposes a methodology for calculating CLT panels as composite beams. This approach allows for the analysis of panels with any number of layers. It is shown that, unlike existing approaches, the behavior of the panel is considered in two directions, rather than as a beam system. Initially, the stiffness characteristics of the panel are determined in each direction, taking shear into account. Then, the slab is analyzed as an orthotropic plate with different stiffness characteristics in mutually perpendicular directions. This calculation is performed either as an orthotropic solid plate or as a cross-laminated beam system. To determine the stiffness characteristics in each direction while considering the shear of the cross-layer boards, the theory of composite beams is used. Taking into account the boundary conditions, the system of differential equations is reduced to a system of algebraic equations by expanding the unknowns and external load in Fourier series.

Abstract: A networked control system is developed for a rolling shear line in this paper. In order to ensure the real time and reliability of communication, the PROFIBUS-DP is employed to structure a networked control system. Automatic cutting to length of steel plate is realized by that control system. The system has been running well since put to use, and the production efficiency is improved. Using the networked control system, not only it is easy to install and reconfigure, but also the costs of the setup and maintenance are reduced. The performance of the networked control system can satisfy the requirement of the rolling shear line.

Abstract: The accuracy of the max shear force of rolling shear is of vital importance to the proper selection of motor power and the optimization design of structure strength. The test on shear force during the shearing process of stainless steel was done on 3000 mm cut-to-length rolling shear of some Large-scale Iron & Steel Co., Ltd. The test results have shown that the weight of upper-blade carrier can bring about the fluctuation of measuring signals of shearing force at the start and end instants. Meanwhile, the shear force during the shearing process will gradually increase with the increment relative cut-in depth, and the process from the bite-in of upper blade into steel plate to the fracture of steel plate is very short, thus the link force on the side of firstly-fallen-off blade will initially increase and then will decrease by large increment amplitude. The shear force at the cut-in stage will dramatically increase. During the cut-in stage, the shear force is basically a constant due to the constant shear angle. In summary, the above test results have important referential value to the calculation of shear force and the design of structure strength.

Abstract: The horizontal blade gap is a key problem in rolling shear. The mathematical model is established in this paper. This model is optimized based on traditional model. The optimized formula of blade clearance is obtained and the stress is analyzed in cutting process. It is benefit for improving shear quality.

Abstract: According to revised Cailikefu’s rolling shear force formula, motion path equation of spatial seven-bar path is built, and mechanical model, with such new structural features as asymmetric and negative offset, is thus successfully established for 2800 mm heavy shear of some Iron&Steel Company. Shear force and bar force of steel plate, before and after adoption of asymmetric and negative offset structure, are analyzed, as well as horizontal force component of mechanism that influences pure rolling shear and back-wall push force that keeps blade clearance. The discovery is that back-wall push force could be kept large enough at rolling start-up (i.e. the time that the maximum rolling shear produces), meanwhile, back-wall push force is the most approximate to side forces with adoption of 60mm~100mm offset. Theoretical results and on-site shear quality both indicate that new structural features such as asymmetric and negative offset plays an important role in ensuring pure rolling shear and keeping blade clearance constant, which provide an effective means to improve quality of steel plate.