【正文】 E—— 彈性模量，取 E=210GPa，代入計(jì)算得： 258 (1 0 . 2 5 ) 3 0 0 0 . 0 0 3 43 . 1 4 2 . 1 1 0a ? ? ????? 圖 32 確定 f39。? ； 2 hHh ?? ； 39。 產(chǎn)品主要用于建筑、橋梁、機(jī)車車輛、汽車、壓力容器、鍋爐、電器等。 張力的作用： ①防止帶鋼在軋制過程中跑偏（保證正確對(duì)中軋制）； ②使所軋帶鋼保持平直（包括在軋制過程中保持板形平直以及軋后板形良好）； ③降低軋件的變形抗力，便于軋制更薄的產(chǎn)品； ④起適當(dāng)調(diào)整冷軋機(jī)主電機(jī)負(fù)荷的作用。 冷軋工藝特點(diǎn)： （ 1）加工溫度低，鋼在軋制過程中產(chǎn)生加工硬化： 1）變形抗力增大，使軋制力加大。 2）塑性降低，易發(fā)生脆裂。 冷軋 帶鋼的優(yōu)勢(shì) : 1）可生產(chǎn)厚度更小的薄板。隨著經(jīng)濟(jì)發(fā)展，冷軋鋼板已被稱為現(xiàn)代社會(huì)必須的材料。l —— 考慮軋輥彈性壓扁的變形區(qū)長(zhǎng)度； K —— 平面變形抗力， sK ?? ； Q —— 前后張力平均值； 2 01 qqQ ?? ( 后張力前張力、 ?? 01 qq ) 遼寧科技大學(xué)課程設(shè)計(jì) 9 計(jì)算步驟如下： (1)確定變形抗力 由于在變形區(qū)內(nèi)各斷面處變形程度不等，因此，通常根據(jù)加工硬化 曲線取本道次平均總壓下率所對(duì)應(yīng)的變形抗力值 s? 。l /h 之圖表 然后在斯通圖解中 2z 尺和 y 尺上分別找出對(duì)應(yīng)其值的兩點(diǎn)，連成一條直線，此直線與 S 形曲線的交點(diǎn)即為 x 的值。K /MPa l /mm h /mm 1 0 18 360 356 2 18 33 27 480 85 467 3 33 48 42 595 591 4 48 57 53 665 667 5 57 60 59 690 75 719 6 道次 z 2z y x xex1? 39。 遼寧科技大學(xué)課程設(shè)計(jì) 19 (3)工作輥輥頸強(qiáng)度校核 ? ??? ?????????9 M p N . 3gdddgdWMKPM 因此，工作輥輥頸強(qiáng)度滿足要求。 電機(jī)能力校核 以第三架為例進(jìn)行校核： 傳動(dòng)力矩計(jì)算： Kmz MMiMM ??? （ 1）軋制力矩 0 1 3 0 0 ????? hRl mKNxlPM gz ??????? 3 式中： l —— 軋輥與金屬軋件的接觸弧長(zhǎng)； ? —— 力臂系數(shù)，冷軋時(shí)?。?～ ； gP —— 工作輥軋制力； （ 2）摩擦力矩 軋輥軸承中的附加摩擦力矩： mKNfdPM ggm ?????? 式中： gd —— 軋輥輥頸直徑； 1f —— 軋輥軸承摩擦系數(shù)， 1 ? ，取 ； 遼寧科技大學(xué)課程設(shè)計(jì) 22 傳動(dòng)機(jī)構(gòu)中的摩擦力矩： mKNi MMM mzm ???????? ??????? ??????????? ?? 111 12 ? 式中： i —— 軋輥與電機(jī)間的傳動(dòng)比，取 ； ? —— 傳動(dòng)機(jī)構(gòu)粘性系數(shù) ； 換算到主電機(jī)軸上的附加摩擦力矩為： mKNMiMMmmm ?????? （ 3）空轉(zhuǎn)力矩 mKNMMM HHK ?????? )~( 式中： HM —— 電機(jī)額定轉(zhuǎn)矩， mKNMM nH ??? 因此傳動(dòng)力矩為： HKmz MmKNMMiMM ????????? 所以第三架電機(jī)功率滿足要求。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal. Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept it. If you are worried about how the time limits apply to you, take advice from one of the anisations listed under Further help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as a damagesbased agreement. In England and Wales, your solicitor can39。s governing body, has also ordered an immediate investigation into the referee39。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。想要的，不想要的，界限明確，好像沒有什么可以撼動(dòng)自己 。t start planning... Those years, those days of do, finally, like youth, will end in our life. 此刻，天空是陰暗的，空氣里有著剛下過雨之后的清新因子。 Baumgartner the disappointing news: Mission aborted. r plays an important role in this mission. Starting at the ground, conditions have to be very calm winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our daytoday weather lives. It will climb higher than the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles/ kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. The supersonic descent could happen as early as Sunda. The weatheThe balloon will slowly drift to the edge of space at 120,000 feet ( Then, I would assume, he will slowly step out onto somethi