《通过实验确认的三辊卷板机上辊位置的分析和经验模型英文翻译》由会员分享，可在线阅读，更多相关《通过实验确认的三辊卷板机上辊位置的分析和经验模型英文翻译（8页珍藏版）》请在金锄头文库上搜索。
1、Analytical and empirical modeling of top roller position for three-roller cylindrical bending of plates and its experimental verification The charact type of level eristic of level adjust below three rollers Rolling Machine in thisinvestigation is as follows.Using the adjust,the end can be bendedwit
2、hout turn around and the whole process of plate coiling including entering、center adjusting、pre-bending、coiling、cylinder proofread can be completedcontinuously;due to whole hydraulic pressure driving protocol,the structure wassimplified,and speed and pressure was easily controlled in the process of
3、platecoiling;The setup of the center adjusting and the equip of supporting,the preciseand quality of plate coiling was improved;owing to the simplified structure,theoperation and maintenance is easy to carried out.KeyWord: Bending Machine；the work rolls；mechanical analysis；the transmission system1、R
4、eported research on the forming of cylindrical shells mostly discusses the modeling and analysis of the process. reported the geometrical analysis of the single pass elasto-plastic bending of beams on the three-roller pyramid benders by assuming triangular moment distribution between the rollers. De
5、veloped model for the bending force and bending moment was based on the contact point shift between the plate and top roll from the vertical centerline of the top roll. described closed loop shape control of three-roller bending process. The presented scheme accomplishes the shape control by measuri
6、ng the loaded shape, the loaded moment and effective beam rigidity of the material in real time. discussed the distribution of curvature and bending moment in accordance with the displacement and rotation of the rolls by simulating the deformation of work piece with U-shaped cross-section in a three
7、-roller bending process. They reported the relationship between the bending moment and the curvature of the work piece by elementary method, which was further used to build up a process model combining the geometries for three-roller bending process. 2、Developed process model was further applied to
8、the real time control system to obtained products with constant and continuously varying curvature. reported a process model for use in simulation of the manufacturing of cylindrical shells from the plates, which require sequential bending, by incorporating the prior bend history. They modeled the p
9、rocess with series of overlapping two-dimensional three point bends, where overlap includes the plastic zone from the previous bends. reported the mathematical model for determining the plate internal bending resistance at the top roll contact for the multi-pass four-roll thin plate bending operatio
10、ns along with the principle mechanisms of bending process for single pass and multi-pass bending. have reported a kinematics based symmetric approach to determine the region of the plate to be rolled, in order to form smoothly curved plates. developed the analytical model to estimate the top roller
11、position as a function of desired radius of curvature, for multiple pass three-roller forming of cylinders, considering real material behavior and change of Youngs modulus of elasticity under deformation and shows that the springback is larger than the springback calculated with constant E. Literatu
12、re review reveals that only limited studies are available on the continuous three-roller bending of plates.3、With reported analytical models, it is difficult to find the top roller position explicitly as a function of the desired radius of curvature and hence it requires solving the set of equations
13、 by nonlinear programming. Use of the close loop shape control or adaptive control or CNC control system can improve the accuracy and the consistency of the process but acquisition and maintenance of such a system is costly and may not be affordable to the small scale to medium scale fabricators. Pu
14、rpose of the present analysis is to develop the model for prediction of the top roller position as a function of the desired radius of curvature explicitly for cylindrical shell bending. Development of the model is based on analytical and empirical approach. Empirical model is developed based on the
15、 top roller position versus loaded radius of curvature plots, which is obtained geometrically for a set of data of center distance between bottom rollers and bottom roller radius.4、ConclusionDeveloped analytical and empirical models were verified with the experiments on three-roller cylindrical bend
16、ing. Following important conclusions were derived out of the reported work:(1) Analytical model based on concept 3, simplifies the calculation procedure for the machine-setting parameters as it expresses the top roller position as an explicit function of desired radius of curvature.(2) Agreement of empirical results with that of the experiments and analytical results based on concept 3 proves the correctness of the procedure.(3) For the small to medium scale fabricators, w
