【正文】 一般情況下，拉深件的尺寸精度應在 IT13 級以下，不宜高于 IT11 級。所以有關(guān)材料標準規(guī)定，作為拉深用的鋼板，其屈強比不大于 。對于沖壓件材料一般要求的力學性能是強度低，塑性高，表面質(zhì)量和厚度公差符合國家標準。 間隙過大時，對毛坯的校直和擠壓作用減小，拉深力降低，模具的壽命提高，但零件的質(zhì)量變差，沖出的零件側(cè)壁不直。 ；凹模制造公差 錯誤 !未找到引用源。在生產(chǎn)上一般應盡量避免采用過小圓角半徑，在保證工件質(zhì)量的前提下盡量取大值，以滿足模具壽命要求。凹模的外形尺寸應保證凹模有足夠的強度，剛度和修磨量。拉深凸模結(jié)構(gòu)如圖 42 所示。 凸模固定板外徑 100 ㎜ ，高度24 ㎜ 。模柄中間有孔可按裝打料桿，模柄的結(jié)構(gòu)尺寸關(guān)系，如圖 46 所示。根據(jù)查閱的內(nèi)容及分析，可選用中間導柱模架， 這種模架的導柱在模具中間位置，沖壓時可防止由于偏心力矩引起的模具歪斜，以凹模輪廓尺寸為依據(jù)，選擇模架規(guī)格 [13]。 沖壓設備的選用 模具閉合高度的計算 模具閉合高度 : H＝ H 卸 ＋ H 凹固 ＋ H 凸固 ＋ H1＋ H2＋ H3＋ H4＋ H 其它 ＝ ㎜ (55) 沖模的閉合高度是指滑塊在下死點即模具在最低工作位置時，上模座上平面與下模座下平面之間的距離 H，沖模的閉合高度必須與壓力機的裝模高度相適應 [14]。 設備的選用 通過較核，選擇開式雙柱可傾式壓力機 J23— 25 能滿足使用要求。通過這次畢業(yè)設計，綜合運用本專業(yè)所學課程的理論和生產(chǎn)實際知識進行了一次沖壓模具設計工作的實際訓練，從而培養(yǎng)和提高了獨立工作能力，鞏固與擴充了沖壓模具設計等課程所學的內(nèi)容，掌握沖壓模具設計的方法和步驟，掌握了沖壓模具設計的基本的模具技能，懂得了怎樣分析零件的工藝性，怎樣確定工藝方案，了解了模具的基本結(jié)構(gòu)，提高了計算能力，繪圖能力，熟悉了規(guī)范和標準，同時各科相關(guān)的課程都有了全面的復習，獨立思考的能力也有了提高。想借次機會感謝四年以來給我?guī)椭乃欣蠋煛⑼瑢W，你們的友誼是我人生的財富，是我生命中不可或缺的一部分。 大學生活即將匆匆忙忙地過去，但我卻能無悔地說：我曾經(jīng)來過。 23 山 西 農(nóng) 業(yè) 大 學 信 息 學 院 畢 業(yè) 設 計 參考文獻 [1] 吳伯杰 , 等 . 沖壓工藝與模具 [M]. 北京 : 電子工業(yè)出版社 , 2022. [2] 胡敬佩 , 彭成允 , 等 . 沖壓工識圖 [M]. 北京 : 化學工業(yè)出版社 , 2022. [3] 王孝培 ,等 . 沖壓手冊 [M]. 北京 : 機械工業(yè)出版社 , 2022. [4] 李天佑 , 等 . 沖模圖冊 [M]. 北京 : 機械工業(yè)出版社 , 1996. [5] 周本凱 ,等 . 沖壓模具設計實踐 [M]. 北京 : 化學工業(yè)出版社 , 2022. [6] 肖祥芷 ,王孝培 ,等 . 中國模具工程大典 [M]. 北京 : 電子工業(yè)出版社 , 2022. [7] 陳劍鶴 , 等 . 冷沖壓模具設計圖冊 [M]. 北京 : 清華大學出版社 , 2022. [8] 王華昌 , 等 . 冷沖模 [M]. 北京 : 中國標準出版社 , 1984. [9] 王孝培 ,等 . 沖壓設計資料 [M]. 北京 : 機械工業(yè)出版社 , 1983. [10] 姜奎華 , 等 . 沖壓工藝學 [M]. 武漢 : 武漢工學院出版社 , 1986. [11] 楊玉英 ,等 .實用沖壓工藝及模具設計手冊 [M].北京 :機械工業(yè)出版社 ,2022. [12] 孫鳳勤 , 閻亞林 ,等 . 沖壓與塑壓成形設備 [M]. 北京 : 北京高等教育出版社 , 2022. [13] Tomesani. of a tensiondriven[M].University of ,12（ 4）： 9396 [14] Pearce. Matal Forming[M]. Bristol、 philadelphia:Adam (08). [15] Tiegang Fang,Ji exact solutions of MHD viscous flow over a shrinking Nonlinear Sci Numer Simulat, 2022,9(12): 28532857. 24 山 西 農(nóng) 業(yè) 大 學 信 息 學 院 畢 業(yè) 設 計 為你提供優(yōu)秀的畢業(yè)論文參考資料，請您刪除以下內(nèi)容， O(∩_∩)O 謝謝?。?！ 2 Many people have the same mixed feelings when planning a trip during Golden Week. With heaps of time, the sevenday Chinese 為 你提供優(yōu)秀的畢業(yè)論文設計參考資料，請您刪除一下內(nèi)容， O(∩_∩)O 謝謝?。?！ National Day holiday could be the best occasion to enjoy a destination. However, it can also be the easiest way to ruin how you feel about a place and you may bee more fatigued after the holiday, due to battling the large crowds. During peak season, a dream about a place can turn to nightmare without careful planning, especially if you travel with children and older people. As most Chinese people will take the holiday to visit domestic tourist destinations, crowds and busy traffic are inevitable at most places. Also to be expected are increasing transport and acmodation prices, with the possibility that there will be no rooms available. It is also mon that you39。s misery, the cow told him to turn its hide into a pair of shoes after it died. The magic shoes whisked Niulang, who carried his two children in baskets strung from a shoulder pole, off on a chase after the empress. The pursuit enraged the empress, who took her hairpin and slashed it across the sky creating the Milky Way which separated husband from wife. But all was not lost as magpies, moved by their love and devotion, formed a bridge across the Milky Way to reunite the family. Even the Jade Emperor was touched, and allowed Niulang and Zhinu to meet once a year on the seventh night of the seventh month. This is how Qixi came to be. The festival can be traced back to the Han Dynasty (206 BCAD 220). Traditionally, people would look up at the sky and find a bright star in the constellation Aquila as well as the star Vega, which are identified as Niulang and Zhinu. The two stars shine on opposite sides of the Milky Way. Customs In bygone days, Qixi was not only a special day for lovers, but also for girls. It is also known as the Begging for Skills Festival or Daughters39。s Day! in shops, hotels and restaurants. But few young women will mark the festival with their boyfriends, or take part in traditional activities to pray for cleverness. A largescale of exhibition on the Silk Road opened to the public in the National Museum on Thursday. The exhibition displays more than 400 treasures from Shaanxi province, Gansu province and 14 other regions. It is largest scale exhibition that shows the history of the Silk Road in recent years. As APEC is going on in Beijing, the exhibit aims to show the world this brilliant section of history. The Silk Road is a series of trade and cultural transmission routes that were central to cultural interaction through regions of the Asian continent. It connected the West and East by linking traders, merchants, pilgrims, monks, soldiers, nomads, and urban dwellers from China and India to the Mediterranean Sea during various periods of time. I met my dear hubby in 2022 the second year I was in my school and it was the first year when he came here. We became colleagues. And there was nothing special happening during that year. He was just a kind and humble brother graduated from the same college as me. But we did not know each other till he became my colleague and his office desk was just in front of me. There was only a glass between us. So actually we could see each other when we both look up. But it is not the main reason that really draws us close. How we bee close to each other was something seems quite natural. We went out to play badminton with other colleagues and we sometimes chatted for a while. He is a man of few words but somehow sometimes will say something really humorous. Then one day, to my great surprise, I found a pot of beautiful flower on my desk. It was just the flower I had talked about with my colleague the other day, and I thought it was her who put the flower there. But the truth is not. It was the humble guy sitting in front of me. He just simply said ,”well