【正文】 this legend, which, contrary to the claim of the English trailer, is totally fictitious, has departed from China but not yet landed on American shores. I am a big fan of Ralph Waldo Emerson39。 names and figuring out what to do with them for the brief time each week that I stand in front of them. I do not consider the challenges of learning to live here part of a purposeful life. I consider those issues existential in nature. One of the problems with my life in America was that I felt it had no purpose. I went to work every day and even did what I could to make my colleagues39。 he wondered how in the world he came to belong there. Indeed his penning and publishing this essay caused his exmunication from high society and also caused him a lot of legal trouble. The legal trouble came as a result of the fact that he was speaking out against the government. I like to reference such texts from time to time as an example both of the fact that history does repeat itself and that this world is not so big that what applies to one s ociety does not in any way touch another society. On a much smaller scale,Emerson39。s president, who is also a renowned tenor, tells China Daily. During a tour in 1985, he went to a village and met an elderly local man, who told him a story about his friendship with a solider from Shenyang, capital of Northeast China39。s Zhangye city during their journey to Kazakhstan, May 5, 2021. The caravan, consisting of more than 100 camels, three horsedrawn carriages and four support vehicles, started the trip from Jingyang county in Shaanxi on Sept 19, 2021. It will pass through Gansu province and Xinjiang Uygur autonomous region, and finally arrive in Almaty, formerly known as AlmaAta, the largest city in Kazakhstan, and Dungan in Zhambyl province. The trip will cover about 15,000 kilometers and take the caravan more than one year to plete. The caravan is expected to return to Jingyang in March 2021. Then they will e back, carrying specialty products from Kazakhstan A small art troupe founded six decades ago has grown into a household name in the Inner Mongolia autonomous region. In the 1950s, Ulan Muqir Art Troupe was created by nine young musicians, who toured remote villages on horses and performed traditional Mongolian music and dances for nomadic families. The 54yearold was born in Tongliao, in eastern Inner Mongolia and joined the troupe in says there are 74 branch troupes across Inner Mongolia and actors give around 100 shows every year to local nomadic people. I can still recall the days when I toured with the troupe in the early 39。 總上所述：凸、凹模采用工作部分 局部淬火 ? ?，硬度 HR C6258 ?? 材料也用淬火變形小的 Cr12MoV 模具鋼。因此，作為冷沖模主要材料的鋼材，應(yīng)具有的性能。 1H —— 墊板高度； max 1HH? —— 最大裝模高度； min 1HH? —— 最小裝模高度。材料選取鑄鐵 HT 200。 寸 ①小孔凸模為圓形，采取臺(tái)階式凸模，它的強(qiáng)度剛性較好，修磨方便，與凸模固定板配合部分按過(guò)渡配合（ H7/m6 或 H7/n7） 制造，最大直徑的作用形式是臺(tái)肩，以便固定，保證工作時(shí)凸模不配拉出，材料選取 Cr12MoV,熱處理硬度為 58～ 62HRC 。該凹模的厚度的全部為有效刃口高度，刃壁無(wú)斜度，刃磨后 刃口尺寸不變，適用于制件或廢料逆沖壓方向推出的沖裁模如復(fù)合模、薄料落料模。 9 表 材料厚度 t 卸料板寬度 B ≤ 50 50～ 80 80～ 125 ho H0 ho H0 ho H0 ～ 6 8 6 10 8 13 ～ 6 10 8 12 10 14 ～ 3 6 10 12 ＞ 12 14 16 查上表得卸料板厚度應(yīng)該大于 12，可取 Ho=20mm 卸料彈簧選取 4 個(gè)圓鋼絲彈簧，其規(guī)格為外徑 mmD 14? , 截面 mmd 2? ,自由高度mmh 12? ,工作高度 mmH ? ,節(jié)距 mmt ? 。選取擋料銷(xiāo)做定距定位零件。 該沖件屬于普通沖裁，精度要求不高又屬于大批量生產(chǎn)，采用倒裝比正裝操作方便簡(jiǎn)單，生產(chǎn)效率較高，因此選用倒裝復(fù)合模。 （ 2）按凸模與凹模配作法加工：常用于沖制復(fù)雜形狀的沖模。 常用的排樣方法有三種： 廢料排樣的缺點(diǎn)是工件質(zhì)量差，模具壽命不高，綜上所述排樣如圖 所示。搭邊值的大小與下列因素有關(guān)： 。所以方案一不合理。由于材料和厚度的原因，我采用的加工方法為：采用復(fù)合工序沖孔落料模進(jìn)行加工。 當(dāng)今社會(huì)的進(jìn)步和發(fā)展，使原有的商品已經(jīng)不能滿足人們對(duì)物質(zhì)的需求，然而有些商品的制造必須依靠模具才能夠生產(chǎn)加工出來(lái)。其中以冷沖壓模、塑料模的技術(shù)要求和復(fù)雜程度較高。工件結(jié)構(gòu)比較復(fù)雜，尺寸全部為自由尺寸，作為普通沖裁，其經(jīng)濟(jì)精度一般在IT12～ IT14 級(jí)，取落料 精度為 IT14 級(jí)，沖孔精度為 IT13 級(jí)。 二、 主要數(shù)據(jù)的計(jì)算 （一）排樣方案的確定及計(jì)算 在沖壓生產(chǎn)中，節(jié)約和減少?gòu)U料具有重要的意義，在模具設(shè)計(jì)中，排樣設(shè)計(jì)是一項(xiàng)極為重要的設(shè)計(jì)工作，排樣的合理與否直接影響到材料的利用率、制件質(zhì)量等，所以排樣工作的好壞是左右沖裁經(jīng)濟(jì)效益的重要因素之一。薄材料的搭邊值應(yīng)取的大一些。對(duì)于該工件，由工件形狀可知壓力中心位于圓心上。 1. 落料部分 取 ? ?m inm a ZZT ??? =。因此選導(dǎo)料銷(xiāo)做為導(dǎo)向且位于條料的同側(cè)，從右向左送料時(shí)導(dǎo)料銷(xiāo)裝在后側(cè)。主要用于沖制薄料和要求制件平整的沖模中，常用在倒裝復(fù)合模中，因此選取彈壓卸料板。凹模壁厚 C=()H=40mm。如圖 圖 h 為刃口高度， a 為斜角，查表 得 h =8mm , a =3176。 表 凸凹模最小壁厚 沖件材料 材料厚度 t ≤ ~ ≥ 1 鋁，銅 （ ） t 黃銅，低碳鋼 （ ） t 硅鋼，磷鋼，中碳鋼 （ ） t 查表計(jì)算選取最小壁厚 。 導(dǎo)柱的直徑 30mm ，長(zhǎng)度 144mm ； 導(dǎo)套的直徑為 31 mm ，長(zhǎng) 144mm ； 應(yīng)按 H 6/h 5 配合；柱間的距離 150mm ； 材料為 20鋼； 查表選取國(guó)產(chǎn) 100KN 壓力機(jī) 其最大裝模高度為 400mm 最小裝模高度為 215mm 模柄孔尺寸為直徑 60mm ，深度為 80mm 工作臺(tái)尺寸左右為 800mm 、前后 4600mm ，厚度 100mm 滑塊尺寸：左右 400mm 、前后 270mm 、 四、閉模高度的計(jì)算 14 為了保 證模具和壓力機(jī)相適應(yīng)，沖模的閉合高度 H 應(yīng)介于壓力機(jī)的最大裝模高度 maxH和最小裝模高度 minH 之間，其關(guān)系式為（ 4－ 1）： mmHHHmmHH 510 1m a x1m in ?????? （ 41） 式中 H —— 沖模的閉模高度 。模具的質(zhì)量、使用壽命、制造精度及合格率很大程度上取決于設(shè)計(jì)時(shí)對(duì)模具材料的選用、熱處理工藝要求、模具零件配合精度及公差等級(jí)的選擇和表面質(zhì)量要求。其基體中碳含量越高沖擊韌性越高。 因水平有限，設(shè)計(jì)中必然有許多不足之處，還望老師批評(píng)指正。s performers of the troupe still tour the region39。s essay titled SelfReliance. If you39。 work lives easier, but I simply could not digest the fact that that was my sole purpose in life. With no family to support, I was the sole beneficiary of my employment: the paycheck, the benefits, the incentives and the rewards were mine alone. Not much of a purpose in being selfserving, is there? While I was a student, I felt I was leading a purposeful life. Learning new