通過(guò)實(shí)驗(yàn)確認(rèn)的三輥卷板機(jī)上輥位置的分析和經(jīng)驗(yàn)?zāi)Ｐ陀⑽姆g

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

17、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, where the volume of production does not permit the acquisition of automated close loop control systems, developed models can

18、 be proved to be simple tool for the first hand estimation of machine setting parameters for required product dimensions.(4) consideration of effect of initial strain and change of modulus of elasticity during deformation on spring back, in analytical/empirical model will further improve the accurac

19、y of prediction of top roller position.(5) further, empirical model based on the experimental loaded curvature distribution between roller supports would consider the top roller-plate contact point shift and will lead to more accurate prediction of top roller position.通過(guò)實(shí)驗(yàn)確認(rèn)的三輥卷板機(jī)上輥位置的分析和經(jīng)驗(yàn)?zāi)Ｐ捅疚难芯康乃?/p>

20、對(duì)稱(chēng)式卷板機(jī)特點(diǎn)如下：采用水平下調(diào)式，即下輥可作水平移動(dòng)，可實(shí)現(xiàn)不用調(diào)頭便可預(yù)彎端頭，使進(jìn)料、對(duì)中、預(yù)彎、卷圓、矯圓整個(gè)卷板過(guò)程連續(xù)完成，利于提高生產(chǎn)效率，降低工人勞動(dòng)強(qiáng)度；設(shè)置板料對(duì)中裝置和支承輥裝置，利于提高卷板精度和卷板質(zhì)量；采用全液壓驅(qū)動(dòng)，使設(shè)備結(jié)構(gòu)簡(jiǎn)化，便于卷板過(guò)程中的速度和壓力控制，起停、換向靈活，運(yùn)行平穩(wěn)，操作方便；結(jié)構(gòu)簡(jiǎn)單，便于操作和維護(hù)維修，符合現(xiàn)場(chǎng)技術(shù)工人的操作和維修水平，高效實(shí)用。關(guān)鍵詞：卷板機(jī)；工作輥；受力分析；傳動(dòng)系統(tǒng)1、本文是研究形成的圓柱殼的大多是討論的建模和分析的過(guò)程。通過(guò)幾何分析對(duì)三輥對(duì)稱(chēng)式卷板機(jī)的彈塑性彎曲，假設(shè)三角力矩分配之間的軋輥。發(fā)展模式的彎曲力和彎矩

21、的基礎(chǔ)上，上輥通過(guò)在兩下輥對(duì)稱(chēng)中央作上下移動(dòng)，而兩下輥的左、右旋轉(zhuǎn)。所描述的閉環(huán)板形控制的三輥彎曲的過(guò)程。由提出的計(jì)劃，完成板形控制測(cè)量加載的形狀，加載和有效剛度的材料。 在討論的分布曲率和彎矩在按照位移和旋轉(zhuǎn)的輥模擬變形的工件與u形截面的過(guò)程中和他們之間的關(guān)系，彎矩和曲率的工件由初等方法。這是進(jìn)一步用來(lái)建立相結(jié)合的幾何構(gòu)型為三輥彎曲的過(guò)程。2、對(duì)現(xiàn)有的控制系統(tǒng)的產(chǎn)品模型進(jìn)一步開(kāi)發(fā)，以獲得與常數(shù)和連續(xù)變曲率。模型的使用在模擬制造圓柱殼從板，這就需要連續(xù)彎曲，這就得到了事先的彎曲資料。他們用重疊包括來(lái)自事先的彎曲的塑料的地域的連續(xù)的交疊處理二維的三點(diǎn)彎曲做模型程序了。通過(guò)數(shù)學(xué)模型，確定上輥對(duì)板內(nèi)部彎曲阻力，多通過(guò)四輥薄板彎曲行動(dòng)隨的原則，彎曲的過(guò)程中為單一通過(guò)和多次通過(guò)彎曲?；趯?duì)稱(chēng)的做法，以確定該地區(qū)的板塊推出