【正文】 e higher and lower sections of the range , simple software rules limit the electrical drive signals to the servovalves ,effectively creating a stable and symmetrical velocity performance in both the extending and retacting directions , over the working range of the cylinder . AWC cylinders The AWC cylinders have a thrust bearing with spherical seating , embedded into the piston . Each cylinder is served by its own 3stage servovalve located nearby . The servovalves and position transducers are interchangeable with the AGC counterparts . Performance details are also summarized in Table 1 . Collapse force is provided by pullback cylinders acting on the roll chocks . These cylinders are controlled to maintain a constant , low , pullback force during the body of the bar , but increasing to a higher value to assist in achieving the tail end antinecking feature . 大學(xué)畢業(yè)設(shè)計(jì) — 外文翻譯 4 ? Hydraulic systems Hydraulic pumpsets are located in the oil cellars . The system serving the HAGC on stands F4 to F7 prises a stainless steel reservoir tank with gravity feed to four axoal piston pumps ( three duty , one standby ) that deliver at 275 bars ( 4000 psi ) . Filtration throughout is 1 micron nominal ( 3 micron absolute ) with a separate oil cooler/filter unit supplied by a separate recirculation pump , drawing oil from the tank , through the filter /cooler and back to the tank . Accumulator manifolds with 38litre , high pressure nitrogenfilled accumulators ( that supply the transient demands mill stand . These accumulators are mounted as close to their respective cylinders as practically possible , to maximize dynamic performance . ? Contol system hardware features One of POSCO39。 distibuted monitor feedback 。 在粗加工實(shí)驗(yàn)臺(tái) R3 后的一些寬度量具過去習(xí)慣于給正向反饋電傳送控制信號(hào)對(duì)修邊機(jī) E4 進(jìn)行自動(dòng)寬度控制，現(xiàn)在現(xiàn)行的寬度量具在粗加工設(shè)備 R4 后，只需要面對(duì)面地調(diào)整。 檢測(cè)器組件見 。每個(gè)氣缸均可以通過它附近的自 身帶的第三類伺服閥確定并使用。當(dāng)數(shù)據(jù)被轉(zhuǎn)達(dá) SCC 的時(shí)候，發(fā)生相同的交換返回命令。 這些快進(jìn)氣缸的運(yùn)動(dòng)軌跡（例如線性的，指數(shù)的，拋物線的以及其他的等等）能通過調(diào)整計(jì)算機(jī)被選擇，并且間隙調(diào)整器的速度和行程長(zhǎng)度被要求。每個(gè)液壓站都通過 SCC或人為地被給與一個(gè)剛性值（從 0 到 100％ ）。 在材料滾動(dòng)中，備用卷和軸承的偏心率能引起重要的特性，尤其是 ACG 精度表，這時(shí)，就象他們無限地剛性的一樣，銑床液壓站運(yùn)轉(zhuǎn)。） ? 結(jié)束語 自動(dòng)寬度控制（ AWC）和自動(dòng)精度控制（ AGC）系統(tǒng)，結(jié)合 了許多新的硬件和軟件的特點(diǎn)，和非?？量痰默F(xiàn)有的性能要求，以達(dá)到改善帶的質(zhì)量的目的。 來自液壓站 F4,F5,F6 和 F7 的出口 X 光精度的反饋對(duì)其自身是慣例的。 給每個(gè)液壓站的絕對(duì)封閉狀態(tài)的 BISRA 精度表模式都是通過 SCC 自動(dòng)地或手動(dòng)地挑選的。 ? 控制系統(tǒng)操作特點(diǎn) 自動(dòng)工件轉(zhuǎn)換器（ AWC）系統(tǒng) —— AWC 系統(tǒng)有兩種功能： ● 通過把下寬度末端最小化達(dá)到末端收獲損失的減少。） 在現(xiàn)有的計(jì)算機(jī)監(jiān)督管理機(jī)構(gòu)（ SCC）和可編程序邏輯控制器（ PLC）之 間的 64 位并行接口使制器絲杠制動(dòng)精度控制（ AGC）不能被擴(kuò)大或者復(fù)制。環(huán)路增益通過動(dòng)力學(xué)最優(yōu)化軟件自動(dòng)校準(zhǔn)。 液壓管被安裝在每個(gè)氣缸的前面，包括伺服閥。 ? 新設(shè)備的概述 一個(gè)先決條件是新的設(shè)備必須結(jié)合現(xiàn)有設(shè)備尋求一個(gè)方法，在很少次品的基礎(chǔ)上運(yùn)用傳統(tǒng)操作實(shí)現(xiàn)反轉(zhuǎn)。 ? Reduce end crop losses by minimizing underwidth ends . ? Improve width tolerances in the body of the bar . Since the edger concerned is E4 and the bar is paratively thin ( approximately 50 mm ) , little can be done to improve necking already created by the previous roughing /edging stands .Nevertheless , a small improvement can be expected by avoiding further worsening through stand E4/R4 . This is acplished by preopening the edger roll gap a calculated amount and then swiftly closing onto the target width as the head end enters the edger . A similar procedure occurs at the tail end , when the gap is quickly opened a calculated amount . The loci of these fast cylinder movements (eg , linear , expontial , parabolic , etc ) can be chosen by the setup puter , as well as the required gap adjustment velocity and stroke length . Accurate tracking of the approach of the head and tail end is essential . This is achieved by special hot metal detectors coupled with bar speed measurement . Inbar width control has two modes : BISRA gagemeter , and feedforward . Although the potential for the former mode of control ( which relies on the accurate sensing of instantaneous roll force to reduce mill stretch ) was always considered limited , due to the high frictional forces relative to the low rolling loads , it was , nevertheless , investigated . It 大學(xué)畢業(yè)設(shè)計(jì) — 外文翻譯 6 was found to be unsatisfactory for the reason stated . The feedforward mode , utilizing ining width error variations detected by a widthmeter after stand E3/R3 , was successful . It resulted in exit width variations , measured after stand E4/R4 , within + mm for 95% of the bar length , as measured by the new widthmeter in this location . This instrument is used to give bar to bar width updating to maintain system calibration . However , it is not used for in bar monitor feedback , because the transport distances involved are a significant proportion of the bar length . ? Hydraulic AGCThe operational features included in the hydraulic AGC system can be divided into those that can be considered as conventional and those that have a novel element . Conventional AGC features include : absolute and lockon BISRA gagementer modes for each hydraulic