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1 畢業(yè)設(shè)計 論文 說明書 題目名稱 打火機(jī)金屬外殼的冷沖壓模具設(shè)計 2 摘要 本次課題打火機(jī)金屬外殼的冷沖壓模具設(shè)計 通過這次設(shè)計 進(jìn)一步熟悉 沖壓模具的設(shè)計流程運(yùn)用落料 沖孔 彎曲等沖壓工序設(shè)計冷沖壓成形模具 需要解決很多的關(guān)鍵問題 對零件進(jìn)行工藝分析 進(jìn)行沖壓工藝方案及模具結(jié) 構(gòu)方案設(shè)計和對沖壓模具零部件工藝參數(shù)進(jìn)行參數(shù)選擇及驗算 繪制沖壓模具 裝配圖和零件圖 需要運(yùn)用機(jī)械 材料成形 冷沖壓模具 計算機(jī)二 三維設(shè) 計等多學(xué)科的知識 需要相當(dāng)廣闊的知識面和較高的專業(yè)水平 通過對零件進(jìn) 行工藝分析和工藝參數(shù)計算 根據(jù)零件所需冷沖壓工序設(shè)計出連續(xù)沖壓模具 同時運(yùn)用 AutoCAD 繪制二維模具裝配圖和零件圖還得同時對部分零件進(jìn)行了 加工工藝分析 該零件復(fù)雜且尺寸不規(guī)則 這對模具設(shè)計和展開排樣提出了較 高的要求 特別是彎曲過程 需要合理的安排工藝 巧妙的設(shè)計沖模來解決 對于部分不關(guān)鍵的零件可適當(dāng)降低尺寸公差要求 設(shè)計中盡可能使用標(biāo)準(zhǔn)件 有利于設(shè)計成本的降低 關(guān)鍵詞 冷沖壓模具 工藝分析 連續(xù)模 打火機(jī)金屬外殼 Abstract This topic lighter metal exterior cold stamping mould design through the design further stamping mould design process using blanking punching bending stamping process design of cold stamping mould needs to solve the key problems of many parts technical analysis stamping process scheme and the die structure and design of stamping mould parts process parameters parameter selection and calculation stamping assembly and detail drawings Need to use machines materials stamping 3 molding cold 3d design of computer science knowledge need quite a broad knowledge and professional level Through the analysis of the technology of parts and the process parameters calculation cold stamping parts needed to process a compound stamping mould design and using AutoCAD assembly drawing two dimensional mould parts and also have also made for parts processing analysis The components and complex the size of irregular of mold design and layout puts forward higher requirements especially the bending process need reasonable arrangement of the clever design process stamping parts to solve the key parts for not properly reduce dimension tolerance requirement design as far as possible to use standard design cost reduction keywords Cold stamping mould Process analysis Continuous mode Lighter metal shell 4 目錄 1 引言 5 2 工藝方案確定 7 2 1 零件及沖壓工藝分析 7 2 2 工藝方案確定與工藝流程圖 8 2 2 1 工藝方案確定 8 2 2 2 工藝流程確定 8 3 工藝參數(shù)的計算 10 3 1 毛坯的尺寸計算 11 3 2 沖裁排樣及材料利用率的計算 11 3 3 各部分工藝力的計算 12 3 3 1 沖裁壓力的計算 12 4 主要工作部分尺寸計算 14 4 1 預(yù)切斷凸凹模的刃口尺寸計算 15 4 2 沖孔凸凹模刃口 尺寸計算 15 4 3 彎曲沖孔凸凹模高度的確定 16 4 4 沖孔凸模的強(qiáng)度和剛度校核 17 4 5 凸凹模的結(jié)構(gòu)選擇設(shè)計 18 5 其他零件設(shè)計 18 6 壓力機(jī)的選擇 25 7 部分零件加工工藝過程 26 8 模具的裝配和使用 28 9 經(jīng)濟(jì)性分析 30 10 結(jié) 論 31 參 考 文 獻(xiàn) 32 致 謝 33 5 1 引言 改革開放以來 隨著國民經(jīng)濟(jì)的高速發(fā)展 市場對模具的需求量不斷增長 近年來 模具工業(yè)一直以 15 左右的增長速度快速發(fā)展 模具工業(yè)企業(yè)的所有 制成分也發(fā)生了巨大變化 除了國有專業(yè)模具廠外 集體 合資 獨(dú)資和私營 也得到了快速發(fā)展 隨著與國際接軌的腳步不斷加快 市場競爭的日益加劇 人們已經(jīng)越來越認(rèn)識到產(chǎn)品質(zhì)量 成本和新產(chǎn)品的開發(fā)能力的重要性 而模具 制造是整個鏈條中最基礎(chǔ)的要素之一 模具制造技術(shù)現(xiàn)已成為衡量一個國家制 造業(yè)水平高低的重要標(biāo)志 并在很大程度上決定企業(yè)的生存空間 近年許多模 具企業(yè)加大了用于技術(shù)進(jìn)步的投資力度 將技術(shù)進(jìn)步視為企業(yè)發(fā)展的重要動力 一些國內(nèi)模具企業(yè)已普及了二維 CAD 并陸續(xù)開始使用 UG Pro Engineer I DEAS Euclid IS 等國際通用軟件 個別廠家還引進(jìn)了 Moldflow C Flow DYNAFORM Optris 和 MAGMASOFT 等 CAE 軟件 并成功應(yīng)用于沖 壓模的設(shè)計中 日前 中國模具協(xié)會企業(yè)年報顯示 2006 年我國模具工業(yè)總產(chǎn)值已達(dá) 516 億元 其中沖壓模具 壓鑄模具等約占總量的 80 預(yù)計到 2010 年 國內(nèi)模 具市場需求量將在 1200 億元人民幣左右 據(jù)介紹 目前我國汽車模具潛在市場 十分巨大 質(zhì)量好的沖壓模具在汽車整車等行業(yè)供不應(yīng)求 因此未來我國機(jī)械 行業(yè)中 模具的發(fā)展 特別是冷沖壓模具的發(fā)展就顯得尤為重要 據(jù)中國模具工業(yè)協(xié)會發(fā)布的統(tǒng)計材料 2004 年我國沖壓模具總產(chǎn)出約為 220 億元 其中出口 0 75 億美元 約合 6 2 億元 根據(jù)我國海關(guān)統(tǒng)計資料 2004 年我國共進(jìn)口沖壓模具 5 61 億美元 約合 46 6 億元 從上述數(shù)字可以得 出 2004 年我國沖壓模具市場總規(guī)模約為 266 6 億元 其中國內(nèi)市場總需求為 260 4 億元 總供應(yīng)約為 213 8 億元 市場滿足率為 82 在上述供求總體情況 中 有幾個具體情況必須說明 一是進(jìn)口模具大部分是技術(shù)含量高的大型精密 模具 而出口模具大部分是技術(shù)含量較低的中低檔模具 因此技術(shù)含量高的中 高檔模具市場滿足率低于沖壓模具總體滿足率 這些模具的發(fā)展已滯后于沖壓 件生產(chǎn) 而技術(shù)含量低的中低檔模具市場滿足率要高于沖壓模具市場總體滿足 率 二是由于我國的模具價格要比國際市場低格低許多 具有一定的競爭力 因此其在國際市場的前景看好 2005 年沖壓模具出口達(dá)到 1 46 億美元 比 2004 年增長 94 7 就可說明這一點(diǎn) 冷沖模具使用壽命的影響及對策 沖壓模具概述 沖壓模具 在冷沖壓加工中 將材料 金屬或非金屬 加工成零件 或半 成品 的一種特殊工藝裝備 稱為冷沖壓模具 俗稱冷沖模 沖壓 是在室溫 下 利用安裝在壓力機(jī)上的模具對材料施加壓力 使其產(chǎn)生分離或塑性變形 從而獲得所需零件的一種壓力加工方法 沖壓模具的形式很多 一般可按以下幾個主要特征分類 根據(jù)工藝性質(zhì)分類 1 沖裁模 沿封閉或敞開的輪廓線使材料產(chǎn)生分離的模具 如落料模 沖孔模 切斷模 切口模 切邊模 剖切模等 2 彎曲模 使板料毛坯或其他坯料沿著直線 彎曲線 產(chǎn)生彎曲變形 從而獲得一定角度和形狀的工件的模具 3 拉深模 是把板料毛坯制成開口空心件 或使空心件進(jìn)一步改變形狀 和尺寸的模具 4 成形模 是將毛坯或半成品工件按圖凸 凹模的形狀直接復(fù)制成形 而材料本身僅產(chǎn)生局部塑性變形的模具 如脹形模 縮口模 擴(kuò)口模 起伏成 形模 翻邊模 整形模等 根據(jù)工序組合程度分類 1 單工序模 在壓力機(jī)的一次行程中 只完成一道沖壓工序的模具 2 復(fù)合模 只有一個工位 在壓力機(jī)的一次行程中 在同一工位上同時 完成兩道或兩道以上沖壓工序的模具 3 級進(jìn)模 也稱連續(xù)模 在毛坯的送進(jìn)方向上 具有兩個或更多的工 位 在壓力機(jī)的一次行程中 在不同的工位上逐次完成兩道或兩道以上沖壓工 序的模具 沖冷沖模全稱為冷沖壓模具 冷沖壓模具是一種應(yīng)用于模具行業(yè)冷沖壓模具及其配件所需高性能結(jié)構(gòu)陶 瓷材料的制備方法 高性能陶瓷模具及其配件材料由氧化鋯 氧化釔粉中加鋁 鐠元素構(gòu)成 制備工藝是將氧化鋯溶液 氧化釔溶液 氧化鐠溶液 氧化鋁溶 液按一定比例混合配成母液 滴入碳酸氫銨 采用共沉淀方法合成模具及其配 件陶瓷材料所需的原材料 反應(yīng)生成的沉淀經(jīng)濾水 干燥 煅燒得到高性能陶 瓷模具及其配件材料超微粉 再經(jīng)過成型 燒結(jié) 精加工 便得到高性能陶瓷 模具及其配件材料 本發(fā)明的優(yōu)點(diǎn)是本發(fā)明制成的冷沖壓模具及其配件使用壽 命長 在沖壓過程中未出現(xiàn)模具及其配件與沖壓件產(chǎn)生粘結(jié)現(xiàn)象 沖壓件表面 光滑 無毛刺 完全可以替代傳統(tǒng)高速鋼 鎢鋼材料 冷沖模具主要零件 冷沖模具是沖壓加工的主要工藝裝備 沖壓制件就是靠上 下模具的相對運(yùn)動 來完成的 加工時由于上 下模具之間不斷地分合 如果操作工人的手指不斷 進(jìn)入或停留在模具閉合區(qū) 便會對其人身安全帶來嚴(yán)重威脅 一 模具的主要零件 作用及安全要求 1 工作零件凸凹模是直接使坯料成形的工作零件 因此 它是模具上的關(guān)鍵零 件 凸凹模不但精密而且復(fù)雜 它應(yīng)滿足如下要求 1 應(yīng)有足夠的強(qiáng)度 不能在沖壓過程中斷裂或破壞 2 對其材料及熱處理應(yīng)有適當(dāng)要求 防止硬度太高而脆裂 2 定位零件定位零件是確定坯件安裝位置的零件 有定位銷 板 擋料銷 板 導(dǎo)正銷 導(dǎo)料板 定距側(cè)刀 側(cè)壓器等 設(shè)計定位零件時應(yīng)考慮操作方 便 不應(yīng)有過定位 位置要便于觀察 最好采用前推定位 外廓定位和導(dǎo)正銷 定位等 3 壓料 卸料及出料零件壓料零件有壓邊圈 壓料板等 壓邊圈可對拉延坯料加壓邊力 從而防止坯料在切向壓力的作用下拱起而 形成皺褶 壓料板的作用是防止坯料移動和彈跳 頂出器 卸料板的作用是便 于出件和清理廢料 它們由彈簧 橡膠和設(shè)備上的氣墊推桿支撐 可上下運(yùn)動 頂出件設(shè)計時應(yīng)具有足夠的頂出力 運(yùn)動要有限位 卸料板應(yīng)盡量縮小閉合區(qū) 域或在操作位置上銑出空手槽 暴露的卸料板的四周應(yīng)設(shè)有防護(hù)板 防止手指 伸入或異物進(jìn)入 外露表面棱角應(yīng)倒鈍 4 導(dǎo)向零件導(dǎo)柱和導(dǎo)套是應(yīng)用最廣泛的一種導(dǎo)向零件 其作用是保證凸凹模在 沖壓工作時有精確的配合間隙 因此 導(dǎo)柱 導(dǎo)套的間隙應(yīng)小于沖裁間隙 導(dǎo) 柱設(shè)在下模座 要保證在沖程下死點(diǎn)時 導(dǎo)柱的上端面在上模板頂面以上最少 5 至 10 毫米 導(dǎo)柱應(yīng)安排在遠(yuǎn)離模塊和壓料板的部位 使操作者的手臂不用越 過導(dǎo)柱送取料 5 支承及夾持零件它包括上下模板 模柄 凸凹模固定板 墊板 限位器等 上下模板是冷沖模具的基礎(chǔ)零件 其他各種零件都分別安裝固定在上面 模板的平面尺寸 尤其是前后方向應(yīng)與制件相適應(yīng) 過大或過小均不利于操作 有些模具 落料 沖孔類模具 為了出件方便 需在模架下設(shè)墊板 這時 墊板最好與模板之間用螺釘連接在一起 兩墊板的厚度應(yīng)絕對相等 墊板的間 距以能出件為準(zhǔn) 不要太大 以免模板斷裂 6 緊固零件它包括螺釘 螺母 彈簧 柱銷 墊圈等 一般都采用標(biāo)準(zhǔn)件 冷 沖模具的標(biāo)準(zhǔn)件用量較多 設(shè)計選用時應(yīng)保證緊固和彈性頂出的需要 避免緊 固件暴露在表面操作位置上 防止碰傷人手和妨礙操作 冷沖模具的發(fā)展 改革開放以來 隨著國民經(jīng)濟(jì)的高速發(fā)展 市場對冷沖模具的需求量不斷 增長 近年來 冷沖模具工業(yè)一直以 15 左右的增長速度快速發(fā)展 冷沖模具 工業(yè)企業(yè)的所有制成分也發(fā)生了巨大變化 除了國有專業(yè)模具廠外 集體 合 資 獨(dú)資和私營也得到了快速發(fā)展 隨著與國際接軌的腳步不斷加快 市場競爭的日益加劇 人們已經(jīng)越來越 認(rèn)識到產(chǎn)品質(zhì)量 成本和新產(chǎn)品的開發(fā)能力的重要性 而冷沖模具制造是整個 鏈條中最基礎(chǔ)的要素之一 冷沖模具制造技術(shù)現(xiàn)已成為衡量一個國家制造業(yè)水 平高低的重要標(biāo)志 并在很大程度上決定企業(yè)的生存空間 近年許多冷沖模具企業(yè)加大了用于技術(shù)進(jìn)步的投資力度 將技術(shù)進(jìn)步視為 企業(yè)發(fā)展的重要動力 一些國內(nèi)模具企業(yè)已普及了二維 CAD 并陸續(xù)開始使用 UG Pro Engineer I DEAS Euclid IS 等國際通用軟件 個別廠家還引進(jìn)了 Moldflow C Flow DYNAFORM Optris 和 MAGMASOFT 等 CAE 軟件 并成功應(yīng)用 于沖壓模的設(shè)計中 以汽車覆蓋件模具為代表的大型沖壓模具的制造技術(shù)已取得很大進(jìn)步 東 風(fēng)汽車公司模具廠 一汽模具中心等模具廠家已能生產(chǎn)部分轎車覆蓋件模具 此外 許多研究機(jī)構(gòu)和大專院校開展模具技術(shù)的研究和開發(fā) 經(jīng)過多年的努力 在模具 CAD CAE CAM 技術(shù)方面取得了顯著進(jìn)步 在提高模具質(zhì)量和縮短模具設(shè) 計制造周期等方面做出了貢獻(xiàn) 雖然中國冷沖模具工業(yè)在過去十多年中取得了令人矚目的發(fā)展 但許多方 面與工業(yè)發(fā)達(dá)國家相比仍有較大的差距 例如 精密加工設(shè)備在冷沖模具加工 設(shè)備中的比重比較低 CAD CAE CAM 技術(shù)的普及率不高 許多先進(jìn)的模具技術(shù) 應(yīng)用不夠廣泛等等 致使相當(dāng)一部分大型 精密 復(fù)雜和長壽命冷沖模具依賴 進(jìn)口 隨著科學(xué)技術(shù)的不斷進(jìn)步 現(xiàn)代工業(yè)產(chǎn)品的生產(chǎn)日益復(fù)雜與多樣化 產(chǎn)品性 能和質(zhì)量也在不斷提高 因而對冷沖壓技術(shù)提出了更高的要求 為了使冷沖壓技 術(shù)能適應(yīng)各工業(yè)部門的需要 冷沖壓技術(shù)自身也在不斷革新和發(fā)展 冷沖壓技術(shù) 的發(fā)展思路就是盡可能地完善和擴(kuò)充冷沖壓工藝的優(yōu)點(diǎn) 克服其缺點(diǎn) 在冷沖壓 技術(shù)的發(fā)展過程中 應(yīng)注意以下幾方面 1 冷沖壓技術(shù)的發(fā)展過程中應(yīng)正確地確定工藝參數(shù)及冷沖模具工作部分的形狀 與尺寸 提高沖壓件的質(zhì)量 縮短新產(chǎn)品試制周期 應(yīng)在加強(qiáng)沖壓成形理論研究 的基礎(chǔ)上 使沖壓成形理論達(dá)到能對生產(chǎn)實際起指導(dǎo)作用 逐步建立起一套密切 結(jié)合生產(chǎn)實際的先進(jìn)的工藝分析計算方法 國外已開始采用彈塑性有限元法對汽 車覆蓋零件的成形過程進(jìn)行應(yīng)力應(yīng)變分析和計算機(jī)模擬 以預(yù)測某一工藝方案對 零件成形的可能性和可能出現(xiàn)的問題 2 加快產(chǎn)品更新?lián)Q代 克服模具設(shè)計周期長的缺點(diǎn) 應(yīng)大力開展模具計算機(jī)輔助 設(shè)計和制造 CAD CAM 技術(shù)的研究 在我國 目前要特別注意加強(qiáng)多工位級進(jìn)模 CAD CAM 技術(shù)的研究 3 滿足大量生產(chǎn)需要以及減輕勞動強(qiáng)度 應(yīng)加強(qiáng)冷沖壓生產(chǎn)的機(jī)械化和自動化 研究 使一般中 小件能在高速壓力機(jī)上采用多工位級進(jìn)模生產(chǎn) 達(dá)到生產(chǎn)高度 自動化 進(jìn)一步提高沖壓的生產(chǎn)率 4 擴(kuò)大冷沖壓生產(chǎn)的運(yùn)用范圍 使冷沖壓既適合大量生產(chǎn) 也適合小批量生產(chǎn) 既能生產(chǎn)一般精度的產(chǎn)品 也能生產(chǎn)精密零件 應(yīng)注意開發(fā)如精密沖裁 特別是厚 料精沖 高能成形 軟模成形 施壓和超塑性加工等新成形工藝 還要推廣簡 易模 軟模和低熔點(diǎn)合金模 通用組合模 數(shù)控沖床等設(shè)備的運(yùn)用 此外 對沖壓板料性能的改進(jìn) 模具新材料 模具新加工方法的開發(fā)也應(yīng)進(jìn)一步 加強(qiáng) 冷沖模具使用壽命的影響及對策 冷沖模具的使用壽命是以沖制出的工件數(shù)量來計算的 影響冷沖模壽命的 因素很多 主要有模具結(jié)構(gòu)設(shè)計 制造模具所用凸模和凹模的材料 模具的熱 處理質(zhì)量與表面強(qiáng)化 沖模零件的制造精度和冷沖壓材料的選取 除此之外 還有沖模的安裝 調(diào)整 使用以及維修等 1 模具設(shè)計對壽命的影響 1 排樣設(shè)計的影響排樣方法與搭邊值對模具壽命的影響很大 過小的搭邊 值 往往是造成模具急劇磨損和凸 凹?？袀闹匾?從節(jié)約材料出發(fā) 搭邊值愈小愈好 但搭邊值小于一定數(shù)值后 對模具壽命和剪切表面質(zhì)量不利 在沖裁中有可能被拉人模具問隙中 使零件產(chǎn)生毛刺 甚至損壞模具刃口 降 低模具壽命 因此 在考慮提高材料利用率的同時 必須根據(jù)零件產(chǎn)量 質(zhì)量 和壽命 確定排樣方法和搭邊值 2 凹模結(jié)構(gòu)的影響對容易產(chǎn)生應(yīng)力集中而開裂的凹模結(jié)構(gòu) 可以采用組合 結(jié)構(gòu)或鑲拼結(jié)構(gòu) 以及預(yù)應(yīng)力結(jié)構(gòu) 從而提高模具使用壽命 3 間隙的影響當(dāng)間隙過小時 壓縮擠壓利害 摩擦力增大 磨損增大 側(cè) 面的磨損加劇 沖裁后卸料和推件時 材料與凸 凹模之間的摩擦還將造成刃 口側(cè)面的磨損比端面的磨大大 同時也容易造成凸 凹模溫度很高 把金屬碎 屑吸附在刃口側(cè)面 形成金屬瘤 使凸 凹模出現(xiàn)崩刃或脹裂現(xiàn)象 因此 過 小的間隙對模具壽命極為不利 間隙太大 會增加凸模與凹模端面邊緣的集中 應(yīng)力 致使壓應(yīng)力急劇增加 于是刃口邊很快屈服變形而失去棱角 因此又增 加了沖裁力 進(jìn)而使刃口邊更快磨損 降低模具壽命 但為了減小凸 凹模的 磨損 延長模具使用壽命 在保證沖裁件質(zhì)量的前提下 設(shè)計時適當(dāng)采用較大 間隙是十分必要的 4 模具導(dǎo)向結(jié)構(gòu)對壽命的影響可靠的導(dǎo)向?qū)τ跍p小工作零件的磨損 避免 凸 凹?？袀欠浅Ｓ行У?特別對無問隙或小問隙沖裁模 復(fù)合模和多工位 級進(jìn)模更為重要 為提高模具壽命 必須根據(jù)工序和零件精度要求 正確選擇 導(dǎo)向形式和導(dǎo)向精度 所選擇導(dǎo)向精度應(yīng)高于凸 凹模的配合精度 5 冷沖壓材料選取的影響冷沖壓材料應(yīng)滿足制件的設(shè)計要求和沖壓工藝要 求 否則容易損傷模具 降低模具使用壽命 冷沖壓材料表面質(zhì)量不好 沖壓 時制件易破裂 也易擦傷模具 冷沖壓材料塑性不好 變形量小 沖壓時制件 易破裂 也易擦傷模具 另外 材料的厚度公差應(yīng)符合國家標(biāo)準(zhǔn) 因為一副沖 模適用于一定材料的厚度 成形 彎曲 翻邊 引伸模具的凸 凹模結(jié)構(gòu)間隙 是直接根據(jù)材料厚度來確定的 所以材料厚度不均勻 會導(dǎo)致廢品產(chǎn)生和模具 損壞 2 模具材料對模具壽命的影響 模具材料對模具壽命的影響是模具材料性質(zhì) 化學(xué)成分 組織結(jié)構(gòu) 硬度 和冶金質(zhì)量等的綜合反映 其中 材料性質(zhì)和熱處理質(zhì)量影響最為明顯 模具 材料性質(zhì)對模具壽命的影響是很大的 如將同一種工件 使用不同的模具材料 做彎曲試驗 試驗結(jié)果 用 9Mn2V 材料 其壽命為 5 萬次 用 Crl2MoV 滲氮 其壽命可達(dá) 40 萬次 因此 在選用材料時 應(yīng)根據(jù)制件的批量大小 合理選用 模具材料 模具工作零件的硬度對模具壽命的影響也很大 但并不是硬度愈高 模具壽命愈長 這是因為硬度與強(qiáng)度 韌性及耐磨性等有密切的關(guān)系 有的沖 模要求硬度高 壽命長 如采用 T10 鋼制造沖模 硬度為 54 58HRC 只沖幾 千次 制件毛刺就很大 如果將硬度提高到 60 64HRC 則刃磨壽命可達(dá) 2 3 萬次 但如果繼續(xù)提高硬度 則會出現(xiàn)早期斷裂 有的沖模硬度不宜過高 如 采用 Crl2MoV 制造凹模硬度為 58 62HRC 時 一般壽命為 2 3 萬件 失效形式 是崩刃和開裂以及如果將硬度降到 54 58HRC 壽命提高到 5 6 萬件 但硬度 降低到 50 53HRC 會出現(xiàn)凹模刃口易磨鈍現(xiàn)象 由此可見 模具硬度必須根據(jù) 材料性質(zhì)和失效形式而定 應(yīng)使硬度 強(qiáng)度 韌性及耐磨性 耐疲勞強(qiáng)度等達(dá) 到特定沖壓工序所需要的最佳配合 3 模具的熱處理質(zhì)量與表面強(qiáng)化對壽命的影響 模具的熱處理質(zhì)量對模具的性質(zhì)與使用壽命影響很大 實踐證明 模具工 作零件的淬火變形與開裂 使用過程中早期斷裂 雖然與材料的冶金質(zhì)量 鍛 造質(zhì)量 模具結(jié)構(gòu)及加工有關(guān) 但與模具的熱處理關(guān)系更大 根據(jù)模具失效原 因的分析統(tǒng)計 熱處理不當(dāng)引起的失效占 50 以上 實踐證明 高級的模具 材料必須配以正確的熱處理工藝 才能真正發(fā)揮材料的潛力 模具工作零件表 面強(qiáng)化處理的目的 是獲得外硬內(nèi)韌的效果 從而得到硬度 耐磨性 韌性 耐疲勞強(qiáng)度的良好配合 模具表面強(qiáng)化處理方法很多 表面處理的新技術(shù)工藝 發(fā)展很快 除氮碳共滲和離子氮化 滲硼 滲鈮 滲釩 表面鍍硬鉻和電火花 強(qiáng)化外 化學(xué)氣相沉積 CVD 和物理氣相沉積 PVD 已逐步采用 經(jīng) CVD 和 PVD 處理后 模具表面覆蓋一層超硬物質(zhì) 如 TiC TiN 等 硬度極高 耐磨性 耐 蝕性 抗黏合性很好 可提高模具壽命幾倍到幾十倍 4 沖模零件的制造精度對模具壽命的影響 沖模制造的精度與使用壽命關(guān)系很大 特別是模具表面粗糙度對模具影響 很大 如用 Crl2MoV 鋼制造落料模 如果表面粗糙度值 R 1 6 m 時 其壽命 為 3 萬件左右 如經(jīng)精拋光 表面粗糙度值 R 0 4 m 壽命可提高到 4 5 萬 件 因此 對模具工作零件表面 一般都要經(jīng)過磨削 研磨 拋光等精加工和 精細(xì)加工 5 其他方面對模具壽命的影響 1 壓力機(jī)的精度不高 也易使沖模損壞 2 沖模在壓力機(jī)上安裝的正確與否及操作者的技術(shù)水平高低 對模具壽命 也有很大影響 3 沖模的保管和維護(hù)好壞 以及使用潤滑劑的情況 也影響模具使用壽命 6 結(jié)語 在實際生產(chǎn)中 對于薄板沖模使用 很少出現(xiàn)非正常磨損的情況 但對于 厚板沖模時則發(fā)現(xiàn)易出現(xiàn)非正常磨損 我們總是針對出現(xiàn)的問題進(jìn)行研究總結(jié) 因為一副冷沖模 從設(shè)計 加工制造 裝配 調(diào)試到安裝 使用 都耗費(fèi)了眾 多工時 同時沖模的凸 凹模使用的材料 大都是優(yōu)質(zhì)合金鋼 因此 沖模的 成本都是比較高的 所以在生產(chǎn)中了解影響沖模壽命的因素及采取相應(yīng)的對策 來指導(dǎo)生產(chǎn) 具有重大的現(xiàn)實意義 Die Life of cold stamping die and mprovements Overview of stamping die Stamping Die Stamping in the cold the material metal or non metallic processing into parts or half of a special technical equipment called cold stamping die commonly known as Die Press is at room temperature using the die installed in the press to put pressure on the material to produce a separation or plastic deformation and thus to obtain the necessary parts of a pressure processing method Stamping die in the form of many the general categories according to the following main features 1 According to the technical nature of 1 Die along the closed or open contour the material are derived from mold If blanking die punch die cut off the mold cut mode cutting mode split mode etc 2 bending mode to blank or blank sheet along a straight line curved line to bend deform and thus obtain a certain angle and shape of the workpiece in the mold 3 The drawing die is made of the blank sheet opening hollow or hollow pieces of further changes to the shape and size of the mold 4 Die rough or semi finished workpiece is convex according to plan direct copy the shape of the die shape the material itself generate only local plastic deformation of the mold Such as the bulging mode reducing the die expansion die forming die rolling flanging mold plastic mold 2 According to the degree classification process combination 1 single process model in a press tour just completed a die stamping process 2 composite model is only one station in a press tour at the same station at the same time to complete more than two or two die stamping process 3 Progressive Die also known as the modulus of continuity in the feeding direction rough with two or more of the station at the press of a visit work in different places on the completion of two or two successive Road over stamping die process Chong called cold stamping die Die wide Cold stamping die is used in cold stamping die mold industry and accessories required for high performance structural ceramic materials preparation methods high performance ceramic materials molds and accessories from the zirconium oxide and yttrium aluminum powder increases Pr element composition Preparation is the solution of zirconia yttria solution praseodymium oxide solution according to a certain percentage of alumina solution when mixed liquor ammonium bicarbonate infusion by co precipitation synthesis of ceramic materials molds and accessories needed for raw materials reaction precipitate generated by the treatment drying calcining and accessories by high performance ceramic mold material superfine powder and then after forming sintering finishing they will have high performance ceramic materials molds and accessories Advantages of this invention is the invention made of cold stamping dies and parts and long service life the process does not appear in the press and its parts and stamping die bond generated the phenomenon of stamping surface is smooth no glitches can replace traditional high speed steel tungsten steel Die with the main parts Die stamping tools is the main process equipment stamping rely on the relative movement under the mold completed Processing time because the upper and lower mold between the constant division and if continued operation of the fingers of workers to enter or remain in the mold closed there will certainly pose a serious threat to their personal safety A of the mold main parts function and safety requirements 1 Working parts is a direct punch to blank forming the working parts therefore it is the key to mold parts Punch not only sophisticated and complex it should meet the following requirements 1 be of sufficient strength can not be broken or destroyed during stamping 2 should be appropriate to its material and heat treatment requirements to prevent too high hardness and brittle fracture 2 Positioning parts positioning part is to determine the location of the parts installed blank there are pins board gauge pin plate lead is sold guide plate knife set from the side side pressure etc Design should be considered when positioning parts easy to operate and should not have had orientation location to facilitate observation preferably in the forward position contouring to correct the pin location and positioning 3 Binder unloading and discharging parts binder components are blank holder binder board Blank holder pressure can drawing blank holder force thereby preventing billets under the action of the tangential pressure arch formed folds The role of pressure plate to prevent movement and bounce blank Top of the device discharge board s role is to facilitate the pieces and clean up waste Them by the spring rubber and equipment putting on the air cushion support can move up and down knocking out pieces of the design should have enough top output movement to the limited spaces Stripper plate area should be minimized or closed position in the operating groove milling out empty handed Exposure of the stripper plate should have protection around the plate to prevent finger inserted into or foreign objects inside exposed surface edges should be blunt down 4 Guide parts and guide sleeve guide pin is the most widely used part of a guide Its role is to ensure punch the punching clearance when accurate match Therefore the guide posts guide cover the gap should be less than the blanking clearance Guide Post located next mold base to ensure that the stroke bottom dead center the lead column in the template on the face over the top for at least 5 to 10 mm Guide columns should be arranged far away from the module and the pressure plate in the area so the operator s arms do not get to take over the lead column material 5 Supporting and clamping the upper and lower parts which includes templates die handle fixed plate punch plate stopper etc Up and down the template is the basis of the cold die parts other parts are respectively fixed at the top Template plane size especially around the direction to be compatible with the workpiece too large or too small are not conducive to action Some molds blanking punching type mold to the pieces of convenience be set up under the mold plate At this time the best and the template plate connected between the screw the two plate thickness should be absolutely equal Plate spacing out the pieces to be able to prevail not too much so as not to break the template 6 Fastening parts which includes screws nuts springs pins washers etc are generally used standard parts Die more with the amount of standard parts design choice and flexibility should be tightened to ensure the top out of the need to avoid exposure to the surface fastener operating position the staff and impede operation to prevent bumps Die with the development of Since reform and opening with the rapid development of the national economy the market demand with the growing Die In recent years Die with the industry has been around 15 growth rate of the rapid development of industrial enterprises with ownership Die components also changed dramatically in addition to the professional mold factory outside of state owned collective joint ventures wholly owned and private has been a rapid development As with the accelerating pace of international integration the increasing competition in the market it has been increasingly recognized product quality cost and new product development capacities The cold die manufacturing is the most basic elements of the chain one of the cold die manufacturing technology to measure a country s manufacturing sector has become an important symbol of the level and largely determine the viability of enterprises Die with enterprises to increase in recent years many technological advances for investment technological progress will be seen as an important driving force for enterprise development Some domestic enterprises have popularized the two dimensional mold CAD and gradually began to use UG Pro Engineer I DEAS Euclid IS and other international common software individual manufacturers have also introduced Moldflow C Flow DYNAFORM Optris and MAGMASOFT etc CAE software and successfully applied in stamping die design A car cover mold as the representative of a large stamping die manufacturing technology has made great progress Dongfeng Motor Corporation mold factory mold manufacturers such as FAW mold center has been able to produce some car cover mold In addition many research institutions and universities to carry out technology research and development of mold After years of effort in the mold CAD CAE CAM technology has made remarkable progress in improving quality and reducing mold die design and manufacturing cycle and so contributed Although China Die with the industry over the past decade has made remarkable development but in many ways compared with the industrialized countries there is still a large gap For example the precision machining equipment processing equipment in Die with the relatively low proportion CAD CAE CAM technology penetration is not high many advanced mold technology not widely so resulting in a considerable number of large sophisticated complex and long Die life with dependence on imports With the continuous progress of science and technology modern industrial production of increasingly complex and diverse product performance and quality is ever increasing thus the cold stamping technology put forward higher requirements In order to adapt to the cold stamping technology industry needs cold stamping technology itself also in innovation and development cold stamping technology idea is to improve and expand as much as possible the advantages of the cold stamping process to overcome its shortcomings in the cold stamping technology development should note the following aspects 1 cold stamping technology process parameters should be properly identified and Die with the work of some of the shape and size to improve the quality of stamping parts and shorten the new product production cycle should be in strengthening the metal forming the basis of theoretical studies to metal forming theory to practice can produce a direction and gradually establish a close connection with the actual production of the advanced process of calculation abroad have begun to use plastic finite element method automobile parts forming process of the stress and strain analysis and computer simulation to predict the forming part of a process plan on the possibilities and potential problems 2 to accelerate product replacement mold design to overcome the shortcomings of a long cycle Should vigorously carry out computer aided design and manufacture of molds CAD CAM Research In my country paying particular attention to strengthening the multi position progressive die CAD CAM Technology 3 to meet the needs of mass production and reduce labor intensity Should strengthen cold stamping of mechanized and automated so that the average small pieces of high speed presses in a multi position progressive die production production reached a high degree of automation to further improve stamping productivity 4 expand the scope of application of cold stamping production So cold pressing both suitable for mass production but also for small batch production both the general accuracy of product production but also can produce precision parts Should pay attention to development such as fine blanking especially thick material fine blanking forming high energy soft mold forming pressure and processing new superplastic forming process but also promote the easy mode soft mode and the low melting point alloy mold Universal Hybrid model the use of CNC punch press and other equipment In addition the performance improvement of sheet metal stamping mold new material die development of new processing methods should be further strengthened Die with life and Countermeasures Die with the life of the workpiece by punching out the number of terms Many factors affect the life Die There are die structure design manufacture molds used in the punch and die materials die quality and surface hardening heat treatment precision die manufacturing parts and cold stamping materials selection In addition there are die installation adjustment use and maintenance 1 Die Design on Life 1 Layout design of layout methods and take the boundary value a great impact on the die life too small to take the boundary value often causing rapid wear and convex mold die bite wounds on the Starting from material savings take the boundary value smaller the better but take the edge is less than some value the cut surface of the mold and the quality of life adversely There will be left behind in the blanking die Q gap were to produce spare parts glitch or even damage the die edge reduce die life Therefore consider increasing the material utilization of the same time parts must yield quality and life expectancy to determine the layout methods and take the boundary 2 die structure prone to stress concentration on the cracking of the die structure composite structure can be used or mosaic structure and prestressed structure to enhance the mold life 3 the impact of clearance when the gap is too small compressed extrusion of interest increased friction increased wear the wear side of aggravated discharge and push pieces after blanking time materials and convex the friction between die will cause wear and tear than the end edge on the side of the grinding much but also easily lead to convex concave mold temperature is high the adsorption of metal debris in the side edge to form a metal tumor so that male and female die chipping or expansion occurs crack phenomenon Therefore the gap is too small to Die Life very bad Gap is too large will increase the punch and the die face the edge of the concentration of stress resulting in a sharp increase in stress so blade edge quickly lose angular yield deformation Therefore addition of blanking force thereby enabling faster edge edge wear reduce die life But in order to reduce the male and female die wear extending mold life while ensuring quality of stamping pieces under the premise that larger space designed properly it is necessary 4 Die oriented structure of the life of a reliable guide for the working parts reduce wear prevent male and female die bite wound is very effective In particular non small Q gap Q gap or Die compound die and multi position progressive die even more important To improve the die life must be based on processes and the demand of precision the correct choice oriented form and orientation accuracy the choice should be higher than the accuracy oriented convex concave mold with precision 5 the impact of cold stamping materials cold stamping materials selected should meet the design requirements of workpieces and stamping process requirements or easy to mold damage and reduce mold life Poor surface quality of cold stamping punching cracking when the workpiece is also easy to scratch mold Bad cold stamping plastic materials deformation is small easy to press when the workpiece rupture but also easy to scratch mold In addition the material thickness tolerances shall comply with national standards Die because of a certain thickness of material suitable for forming bending flanging drawing die of the male and female die structure gap is directly determined by the thickness of the material Therefore uneven thickness will result in waste generation and mold damage 2 Die Die Life of Die Die Life of a mold material properties chemical composition structure hardness and comprehensive reflection of metallurgical quality Among them the material properties and heat treatment affect the quality of the most obvious Mold material properties on the impact of die life is great If the same workpiece using a different mold material of the bending test the test results The 9Mn2V material the life of 5 million with Crl2MoV nitriding the life of up to 40 million Therefore the choice of materials the batch size should be based on workpiece rational use of mold materials The hardness of the die parts to Die Life a great impact But not the higher hardness longer die life This is because the hardness and strength toughness and abrasion resistance are closely related Some die demands of high hardness long life Such as the use of T10 steel dies hardness 54 58HRC only washed thousands of times a burr on the workpiece great If the hardness to 60 64HRC the grinding life of up to 2 to 3 million However if continue to improve hardness fracture occurs earlier Some die hardness should not be too high as the die manufacturing using Crl2MoV 58 62HRC hardness the general life of 2 3 million invalid form of chipping and cracking and if the hardness down to 54 58HRC life expectancy increased to 5 60 000 but decreased to 50 53HRC hardness appears easy to blunt the die edge phenomenon Thus mold hardness must be based on material properties and failure modes may be Should enable the hardness strength toughness and wear resistance resistance to fatigue strength needed to achieve a particular stamping process the best match 3 The surface of the mold heat treatment to strengthen the quality and impact on life Mold heat treatment the nature and quality of life of the mold a great impact Practice shows that the die parts of the quenching distortion and cracking early fracture during use while the metallurgical and materials quality forging quality mold structure and process related but related more to die of heat treatment According to statistical analysis of failure causes of mold heat treatment failure due to improper accounting for more than 50 Practice shows that the mold material must be accompanied by high heat treatment process properly can really play a material s potential Parts surface hardening mold work purpose is to obtain the effect of external hard tough inside so be hardness wear resistance toughness good resistance to fatigue with Many ways to die surface hardening surface treatment technology of new technologies developed rapidly In addition to Nitrocarburizing and ion nitride boride seepage niobium vanadium permeability hard chrome plated and spark strengthening the chemical vapor deposition CVD and physical vapor deposition PVD has been gradually adopted By CVD and PVD treatment the mold surface covered with super hard material such as TiC TiN etc High hardness wear resistance corrosion resistance adhesion is very good can improve the die life several times to several times 4 Manufacturing precision of the die parts of die life Precision die manufacturing and life in it in particular mold surface roughness on the mold a great impact If using Crl2MoV steel blanking die if the surface roughness value R 1 6 m its life span is about 30 000 Such as polished by the precision surface roughness value R 0 4 m life can be increased to 4 5 million Therefore the working parts of the mold surface the general must go through grinding grinding polishing and other finishing and fine processing 5 Other aspects of the impact of die life 1 Press the accuracy is not high but also easy to make die damage 2 die in the press or not installed properly and the operator s technical level on the tool life is also greatly affected 3 dies in the custody and maintenance of good and bad and the use of lubricant condition also affects mold life 6 Conclusion In actual production sheet metal dies for use rare case of non normal wear and tear But when the die plate was found prone to irregular wear we always study for the problems summarized Because of a cold die from the design manufacture assembly commissioning and installation and use all spent many hours while the convex die die material used mostly high quality alloy steel Therefore the die cost is relatively high Therefore in the production of understanding the factors that affect the die life and take the appropriate measures to guide the production of great practical significance