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河南機(jī)電高等專科學(xué)校 畢業(yè)設(shè)計(jì) 論文 任務(wù)書 系 部 材料工程系 專 業(yè) 模具設(shè)計(jì)與制造 學(xué) 生 姓 名 鄭 圣 學(xué) 號(hào) 0312149 設(shè)計(jì) 論文 題目 鐵芯片無廢料跳步模 起 迄 日 期 2006 年 4 月 3 日 5 月 13 日 指 導(dǎo) 教 師 楊占堯 教授 發(fā)任務(wù)書日期 2006 年 4 月 3 日 畢 業(yè) 設(shè) 計(jì) 論 文 任 務(wù) 書 1 本畢業(yè)設(shè)計(jì) 論文 課題來源及應(yīng)達(dá)到的目的 模具畢業(yè)設(shè)計(jì)是一個(gè)重要的專業(yè)教學(xué)環(huán)節(jié) 這個(gè)數(shù)學(xué)環(huán)節(jié)的目的 1 幫助學(xué)生具體運(yùn)用和鞏固 模具設(shè)計(jì)與制造 課程及相關(guān)的理論知識(shí) 了解設(shè)計(jì)沖 壓模的一般程序 2 使學(xué)生能夠熟練地運(yùn)用有關(guān)技術(shù)資料 如 冷沖模國(guó)家標(biāo)準(zhǔn) 模具設(shè)計(jì)與制造 簡(jiǎn)明手冊(cè) 冷沖壓模具結(jié)構(gòu)圖冊(cè) 及其它有關(guān)規(guī)范等 3 訓(xùn)練學(xué)生初步設(shè)計(jì)冷沖壓模具的能力 為以后的工作打下初步的基礎(chǔ) 2 本畢業(yè)設(shè)計(jì) 論文 課題任務(wù)的內(nèi)容和要求 包括原始數(shù)據(jù) 技術(shù)要求 工作要求等 沖壓模課程設(shè)計(jì)按以下內(nèi)容進(jìn)行 1 擬定沖壓工序安排方案 畫出沖壓工序圖 畫出待設(shè)計(jì)模具的排樣圖 2 計(jì)算沖裁力 確定模具壓力中心 計(jì)算凹模周界 確定待設(shè)計(jì)模具的有關(guān)結(jié)構(gòu)要素 選用模具典型組合等 初選壓力機(jī)噸位 3 考慮工廠的實(shí)際情況 4 確定壓力機(jī)噸位 5 模具模板與作用原理和公差 6 沖裁間隙 7 設(shè)計(jì)及繪制模具裝配圖 8 設(shè)計(jì)及繪制模具零件圖 9 設(shè)計(jì)及繪制模具模板圖 10 按規(guī)定格式編制設(shè)計(jì)說明書 11 課程設(shè)計(jì)面批后或答辯 所在專業(yè)審查意見 負(fù)責(zé)人 年 月 日 系部意見 系領(lǐng)導(dǎo) 年 月 日 畢業(yè)設(shè)計(jì)說明書目錄 緒 論 1 第 1 章 設(shè)計(jì)內(nèi)容及要求 4 1 1 制件圖 材料及要求 4 第 2 章 沖裁件的工藝分析 5 第 3 章 主要設(shè)計(jì)計(jì)算 6 3 1 排樣方式的確定 6 3 2 毛胚的確定 6 3 3 沖裁力的計(jì)算 7 3 3 1 沖裁力 7 3 3 2 壓力中心的確定及相關(guān)尺寸的計(jì)算 8 3 4 工作零件刃口尺寸計(jì)算 8 第 4 章 模具總體設(shè)計(jì)及主要零部件設(shè)計(jì) 11 4 1 模具結(jié)構(gòu)的選擇 11 4 2 卸料彈簧的設(shè)計(jì)與計(jì)算 11 4 3 沖壓設(shè)備的選擇 12 4 4 送料機(jī)機(jī)型 功能規(guī)格名稱 送料寬度 送料厚度 13 4 5 模具的總體設(shè)計(jì) 15 4 5 1 模具類型的選擇 15 4 5 2 定位方式的選擇 15 4 5 3 導(dǎo)向方式的選擇 15 4 6 主要零部件的設(shè)計(jì) 15 4 6 工作零件的結(jié)構(gòu)設(shè)計(jì) 15 4 6 2 落料凸模的設(shè)計(jì) 15 4 6 3 落料凹模的設(shè)計(jì) 16 4 6 4 定位零件的設(shè)計(jì) 16 4 7 卸料部件的設(shè)計(jì) 16 4 7 1 卸料板的設(shè)計(jì) 16 4 7 2 卸料螺釘?shù)倪x用 17 4 7 3 頂件裝置 17 4 7 4 快拆裝置 17 4 8 沖孔模各模板 零件的名稱 材質(zhì) 硬度及功能 18 4 9 模具零件公差及間隙標(biāo)準(zhǔn) 20 4 10 沖裁刃口要求及沖裁間隙標(biāo)準(zhǔn) 20 4 11 模具總裝圖 21 4 12 模具工作零件的加工工藝 22 第 5 章 模具的裝配和調(diào)整 23 畢業(yè)設(shè)計(jì)說明書目錄 5 1 主要組件的裝配 23 5 1 1 凸模的裝配 23 5 1 2 彈壓卸料板的裝配 23 5 2 總裝配 23 5 3 沖裁模試沖的缺陷和調(diào)整 24 5 4 模具設(shè)計(jì)要點(diǎn) 26 5 4 1 送料 26 5 4 2 出料 27 5 4 3 精度 27 結(jié) 論 28 致 謝 29 參考文獻(xiàn) 30 鐵芯片無廢料跳步模 摘要 沖壓模具作為制造產(chǎn)品 或半產(chǎn)品 的一種工具 其作用是完成某種工藝 模具設(shè)計(jì)必 須滿足工藝要求 最終滿足產(chǎn)品的形狀 尺寸和精度的要求 因此沖壓設(shè)計(jì)師必須掌握 沖壓工藝 包括沖壓工藝的分類 各種工藝計(jì)算 工藝制訂等基礎(chǔ)知識(shí) 而后才可以選 擇模具的類型 進(jìn)行模具設(shè)計(jì) 使模具的類型表面質(zhì)量 尺寸精度結(jié)構(gòu)及尺寸等滿足工 藝及產(chǎn)品的要求 冷沖壓工藝大致分兩類 分離工序和成型工序 分離工序的目的是在沖壓過程中將 沖壓件與板料按一定的輪廓線進(jìn)行分離 分離工序又可分為落料 沖孔和剪切等 成型 工序的目的是使沖壓毛胚在不破壞其完整性的條件下產(chǎn)生塑性變形 并轉(zhuǎn)化成產(chǎn)品所需 要的形狀 成形工序又分為彎曲 拉深 翻邊 翻孔 脹形 擴(kuò)孔等 冷沖壓模具是沖壓生產(chǎn)的主要工藝設(shè)備 沖壓件的表面質(zhì)量 尺寸精度 生產(chǎn)率以及經(jīng) 濟(jì)效益等 與模具結(jié)構(gòu)及設(shè)計(jì)是否合理關(guān)系極大 關(guān)鍵詞 落料 塑性變形 工藝計(jì)算 工藝制訂 表面質(zhì)量 尺寸精度 Injection Mold for long Junction Summary Hurtle a kind of tool of press the molding tool conduct and actions manufacturing product or the half product its function is to complete a certain craft Therefore hurtling to press designer must control to hurtle to press the craft the classification various craft calculation craft that includes to hurtle to press the craft establishes etc the foundation knowledge just can choose the type of the molding tool and then carry on the molding tool design make the type structure and size etc of the molding tool satisfy the request of the craft and product Cold hurtle to press the craft to divide mostly two type Separate the work preface and model the work preface Purpose that separates the work preface is at hurtle to ran over the distance lieutenant general to hurtle to press the piece and planks to anticipate to press certain outline line to carry on the separation Separating the work preface can is divided in to fall to anticipate again blunt bore and shear to slice etc The purpose that models the work preface is to make hurtle to press the hair the creation transforms under the condition of not break its integrity and convert the shape that product need Take shape the work preface and is divided into the flection and pull deep turn over the side turn over the bore bulge form and expand the bore etc Cold hurtle to press the molding tool is main craft equipments that hurtles to press to produce Hurtle the surface quantity size accuracy rate of production and the economy performance etc of press the piece with the molding tool structure and designs whether the reasonable relation is biggest Keyword Fall to anticipate plastic deformation the craft calculation craft establish surface quantity size accuracy 機(jī)械加工工藝過程卡 產(chǎn)品型號(hào) 零 部 件圖號(hào) 02 機(jī)械加工工藝過程卡片 產(chǎn)品名稱 凹模 零 部 件名稱 凹模 材料牌號(hào) Cr12MoV 毛 坯 種 類 卷料 毛坯 外型 尺寸 27 35 25 備注 凸模配制 工時(shí) 工序號(hào) 工序名稱 工 序 內(nèi) 容 車間 工段 設(shè)備 工 藝 裝 備 準(zhǔn)終 單件 1 下料 140 長(zhǎng) 65mm 金工 普通鋸床 0 5 2 鍛造 鍛方形體 L210 B125 H65 金工 空氣錘 1 3 退火 消除鍛造后的內(nèi)應(yīng)力 并改善其加工性能 金工 7 4 刨 銑 刨成六面體 厚度留余 量 0 4 0 6mm 金工 2 5 平磨 磨上下兩平面及相鄰兩 側(cè)面 對(duì)角尺達(dá)到 Ra0 63 1 25 金工 1 6 劃線 鉗工按型孔及其他安裝 孔劃線 金工 1 7 鉗工 鉆出穿絲孔 金工 0 5 8 插 銑 金工 9 鉗工 加工螺孔 金工 2 10 熱處 理 淬火 回火 58 62HRC 金工 7 11 平磨 磨上下兩平面 表面粗 糙度值應(yīng)小于 Ra0 8 金工 2 12 電火 花切 割凹 模 按圖樣編制切割程序 并將程序打成紙帶 將 紙帶輸入計(jì)算機(jī) 金工 13 研光 是工作表面光潔 金工 設(shè) 計(jì) 日 期 審核 日期 標(biāo)準(zhǔn)化日 期 會(huì)簽 日期 標(biāo)記 記數(shù) 更改文 件號(hào) 簽字 日期 標(biāo)記 處數(shù) 更該 文件 號(hào) 沖壓成形與板材沖壓 1 概述 通過模具使板材產(chǎn)生塑性變形而獲得成品零件的一次成形工藝方法叫做 沖壓 由于沖壓通常在冷態(tài)下進(jìn)行 因此也稱為冷沖壓 只有當(dāng)板材厚度超 過 8 100mm 時(shí) 才采用熱沖壓 沖壓加工的原材料一般為板材或帶材 故也 稱板材沖壓 某些非金屬板材 如膠木板 云母片 石棉 皮革等 亦可采 用沖壓成形工藝進(jìn)行加工 沖壓廣泛應(yīng)用于金屬制品各行業(yè)中 尤其在汽車 儀表 軍工 家用電 器等工業(yè)中占有極其重要的地位 沖壓成形需研究工藝設(shè)備和模具三類基本 問題 板材沖壓具有下列特點(diǎn) 1 高的材料利用率 2 可加工薄壁 形狀復(fù)雜的零件 3 沖壓件在形狀和尺寸方面的互換性好 4 能獲得質(zhì)量輕而強(qiáng)度高 剛性好的零件 5 生產(chǎn)率高 操作簡(jiǎn)單 容易實(shí)現(xiàn)機(jī)械化和自動(dòng)化 沖壓模具制作成本高 因此適合大批量生產(chǎn) 對(duì)于小批量 多品種生產(chǎn) 常采用簡(jiǎn)易沖模 同時(shí)引進(jìn)沖壓加工中心等新型設(shè)備 以滿足市場(chǎng)求新求變 的需求 板材沖壓常用的金屬材料有低碳鋼 銅 鋁 鎂合金及高塑性的合 金剛等 如前所述 材料形狀有板材和帶材 沖壓生產(chǎn)設(shè)備有剪床和沖床 剪床是用來將板材剪切成具有一定寬度的 條料 以供后續(xù)沖壓工序使用 沖床可用于剪切及成形 2 沖壓成形的特點(diǎn) 生產(chǎn)時(shí)間中所采用的沖壓成形工藝方法有很多 具有多種形式餓名稱 但塑性變形本質(zhì)是相同的 沖壓成形具有如下幾個(gè)非常突出的特點(diǎn) 1 垂直于板面方向的單位面積上的壓力 其數(shù)值不大便足以在板面方 向上使 板材產(chǎn)生塑性變形 由于垂直于板面方向上的單位面積上壓力的素 質(zhì)遠(yuǎn)小于板面方向上的內(nèi)應(yīng)力 所以大多數(shù)的沖壓變形都可以近似地當(dāng)作平 面應(yīng)力狀態(tài)來處理 使其變形力學(xué)的分析和工藝參數(shù)的計(jì)算大呢感工作都得 到很大的簡(jiǎn)化 2 由于沖壓成形用的板材毛胚的相對(duì)厚度很小 在壓應(yīng)力作用下的抗 失穩(wěn)能力也很差 所以在沒有抗失穩(wěn)裝置 如壓邊圈等 的條件下 很難在 自由狀態(tài)下順利地完成沖壓成形過程 因此 以拉應(yīng)力作用為主的伸長(zhǎng)類沖 壓成形過程多于以壓應(yīng)力作用為主的壓縮類成形過程 3 沖壓成形時(shí) 板材毛胚內(nèi)應(yīng)力的數(shù)值等于或小于材料的屈服應(yīng)力 在這一點(diǎn)上 沖壓成形與體積成形的差別很大 因此 在沖壓成形時(shí)變形區(qū) 應(yīng)力狀態(tài)中的靜水壓力成分對(duì)成形極限與變形抗力的影響 已失去其在體積 成形時(shí)的重要程度 有些情況下 甚至可以完全不予考慮 即使有必要考慮 時(shí) 其處理方法也不相同 4 在沖壓成形時(shí) 模具對(duì)板材毛胚作用力所形成的約束作用較輕 不 像體積成形 如模鍛 是靠與制件形狀完全相同的型腔對(duì)毛胚進(jìn)行全面接觸 而實(shí)現(xiàn)的強(qiáng)制成形 在沖壓成形中 大多數(shù)情況下 板材毛胚都有某種程度 的自由度 常常是只有一個(gè)表面與模具接觸 甚至有時(shí)存在板材兩側(cè)表面都 有于模具接觸的變形部分 在這種情況下 這部分毛胚的變形是靠模具對(duì)其 相鄰部分施加的外力實(shí)現(xiàn)其控制作用的 例如 球面和錐面零件成形時(shí)的懸 空部分和管胚端部的卷邊成形都屬這種情況 由于沖壓成形具有上述一些在變形與力學(xué)方面的特點(diǎn) 致使沖壓技術(shù)也 形成了一些與體積成形不同的特點(diǎn) 由于不需要在板材毛的表面施加很大的 單位壓力即可使其成形 所以在沖壓技術(shù)中關(guān)于模具強(qiáng)度與剛度的研究并不 十分重要 相反卻發(fā)展了學(xué)多簡(jiǎn)易模具技術(shù) 由于相同原因 也促使靠氣體或液體壓力成形的工藝方法得以發(fā)展 因 沖壓成形時(shí)的平面應(yīng)力狀態(tài)或更為單純的應(yīng)變狀態(tài) 與體積成形相比 當(dāng) 前對(duì)沖壓成形匯中毛胚的變形與 力能參數(shù)方面的研究較為深入 有條件運(yùn) 用合理的科學(xué)方法進(jìn)行沖壓加工 借助于電子計(jì)算機(jī)與先進(jìn)的測(cè)試手段 在 對(duì)板材性能與沖壓變形參數(shù)進(jìn)行實(shí)時(shí)測(cè)量與分析基礎(chǔ)上 實(shí)現(xiàn)沖壓過程智能 化控制的研究工作也在開展 人們?cè)趯?duì)沖壓成形過程有離開較為深入的了解 后 已經(jīng)認(rèn)識(shí)到?jīng)_壓成型與原材料有十分密切的關(guān)系 所以 對(duì)板材沖壓性 能即成形性與形狀穩(wěn)定性的研究 目前已成為沖壓技術(shù)的一個(gè)重要內(nèi)容 對(duì) 板材沖壓性能的研究工作不僅是沖壓技術(shù)發(fā)展的需要 而且也促進(jìn)了鋼鐵工 業(yè)生產(chǎn)技術(shù)的發(fā)展 為其提高板材的質(zhì)量提供了一個(gè)可靠的基礎(chǔ)與依據(jù) 3 沖壓變形的分類 沖壓變形工藝可完成多種工序 其基本工序可分為分離工序和變形工序 兩大類 分離工序是使胚料的一部分與另一部分相互分離的工藝方法 主要 有落料 沖孔 切邊 剖切 修整等 其中又以沖孔 落料應(yīng)用最廣 變形 工序是使胚料的一部分相對(duì)于另一部分產(chǎn)生位移而不破裂的工藝方法 主要 有拉深 彎曲 局部成形 脹形 翻邊 縮徑 校形 旋壓等 從本質(zhì)上看 沖壓成形就是毛胚的變形區(qū)在外力的作用下產(chǎn)生相應(yīng)的塑 性變形 所以變形區(qū)內(nèi)的應(yīng)力狀態(tài)和變形特點(diǎn)景象的沖壓成形分類 可以把 成形性質(zhì)相同的成形方法概括成同一個(gè)類型并進(jìn)行體系化的研究 絕大多數(shù)沖壓成形時(shí)毛胚變形區(qū)均處于平面應(yīng)力狀態(tài) 通常認(rèn)為在板材 表面上不受外力的作用 即使有外力作用 其數(shù)值也是較小的 所以可以認(rèn) 為垂直于板面方向上的應(yīng)力為零 使板材毛胚產(chǎn)生塑性變形的是作用于板面 方向上相互的兩個(gè)主應(yīng)力 由于板厚較小 通常都近似地認(rèn)為這兩個(gè)主應(yīng)力 在厚度方向上是均勻分布的 基于這樣的分析 可以把各種形式?jīng)_壓成型中 的毛陪變形區(qū)的受力狀態(tài)與變形特點(diǎn) 在平面應(yīng)力的應(yīng)力坐標(biāo)系中與相應(yīng)的 兩向應(yīng)變坐標(biāo)系中以應(yīng)力與應(yīng)變坐標(biāo)決定的位置來表示 4 沖壓用原材料 沖壓加工用原材料有很多種 它們的性能也有很大的差別 所以必須根 據(jù)原材料的性能與特點(diǎn) 采用不同的沖壓成形方法 工藝參數(shù)和模具結(jié)構(gòu) 才能達(dá)到?jīng)_壓加工的目的 由于人們對(duì)沖壓成形過程板材毛胚的變形行為有 了較為深入的認(rèn)識(shí) 已經(jīng)相當(dāng)清楚的建立了由原材料的化學(xué)成分 組織等因 素所決定的材料性能與沖壓成形之間的關(guān)系 這就使原材料生產(chǎn)部門不但按 照沖壓件的工作條件與使用要求進(jìn)行原材料的設(shè)計(jì)工作 而且也根據(jù)沖壓件 加工過程對(duì)板材性能的要求進(jìn)行新型材料的開發(fā)工作 這是沖壓技術(shù)在原材 料研究方面的一個(gè)重要方向 對(duì)沖壓用原材料沖壓性能方面的研究工作有 1 原材料沖壓性能的含義 2 判斷原材料沖壓性能的科學(xué)方法 確定可以確切反映材料沖壓性能的 參數(shù) 建立沖壓性能的參數(shù)與實(shí)際沖壓成形間的關(guān)系 以及沖壓性能參數(shù)的 測(cè)試方法等 3 建立原材料的化學(xué)成分 組織和制造過程與沖壓性能之間的關(guān)系 沖 壓用原材料主要是各種金屬與非金屬板材 金屬板材包括各種黑色技術(shù)和有 色金屬板材 雖然在沖壓生產(chǎn)中所用金屬板材的種類很多 但最多的原材料 蛀牙是鋼板 不銹鋼板 鋁合金板及各種復(fù)合金屬板 5 板材沖壓性能及其鑒定方法 板材是指對(duì)沖壓加工的適應(yīng)能力 對(duì)板材沖壓性能的研究具有飛行重要 的意義 為了能夠運(yùn)用最科學(xué)與最經(jīng)濟(jì)合理的沖壓工藝過程與工藝參數(shù)制造 出沖壓零件 必須對(duì)作為加工對(duì)象的板材的性能具有十分清楚的了解 這樣 才有可能充分地利用板材在加工方面的潛在能力 另一方面 為了能夠依據(jù) 沖壓件的形狀與尺寸特點(diǎn)及其所需的成形工藝等基本因素 正確 合理地選 用板材 也必須對(duì)板材的沖壓性能有一個(gè)科學(xué)的認(rèn)識(shí)與正確的判斷 評(píng)定板 材沖壓性能的方法有直接試驗(yàn)法與間接試驗(yàn)法 實(shí)物沖壓試驗(yàn)是最直接的板材沖壓性能的評(píng)定方法 利用實(shí)際生產(chǎn)設(shè)備 與模具 在與生產(chǎn)完全相同的條件下進(jìn)行實(shí)際沖壓零件的性能評(píng)定 當(dāng)然能 夠的最可靠的結(jié)果 但是 這種評(píng)定方法不具有普遍意義 不能作為行業(yè)之 間的通用標(biāo)準(zhǔn)進(jìn)行信息的交流 模擬試驗(yàn)是把生產(chǎn)中實(shí)際存在的沖壓成形方法進(jìn)行歸納與簡(jiǎn)單化處理 消除許多過于復(fù)雜的因素 利用軸對(duì)稱的簡(jiǎn)化了的成形方法 在保證試驗(yàn)中 板材的變形性質(zhì)與應(yīng)力狀態(tài)都與實(shí)際沖壓成形相同的條件下進(jìn)行的沖壓性能 的評(píng)定工作 為了保證模擬試驗(yàn)結(jié)果的可靠性與通用性 規(guī)定了私分具體的 關(guān)于試驗(yàn)用工具的幾何形狀與尺寸 毛胚的尺寸 試驗(yàn)條件 沖壓速度 潤(rùn) 滑方法 壓邊力等 間接試驗(yàn)法也叫做基礎(chǔ)試驗(yàn)法 間接試驗(yàn)法的特點(diǎn)是 在對(duì)板材在塑性 變形過程中所表現(xiàn)出的基本性質(zhì)與規(guī)律進(jìn)行分析與研究的基礎(chǔ)上 進(jìn)一步把 它和具體的沖壓成形中板材的塑性變形參數(shù)聯(lián)系起來 建立間接試驗(yàn)結(jié)果 間接試驗(yàn)值 與具體的沖壓成形性能 工藝參數(shù) 之間的相關(guān)性 由于間 接試驗(yàn)時(shí)所用試件的形狀與尺寸以及加載的方式等都不同于具體的沖壓成形 過程 所以它的變形性質(zhì)和應(yīng)力狀態(tài)也不同于沖壓變形 因此間接試驗(yàn)所得 的結(jié)果 試驗(yàn)值 并不是沖壓成形的工藝參數(shù) 而是可以用來表示板材沖壓 性能的基礎(chǔ)性參數(shù) Characteristics and Sheet Metal Forming 1 The article overview Stamping is a kind of plastic forming process in which a part is produced by means of the plastic forming the material under the action of a die Stamping is usually carried out under cold state so it is also called stamping Heat stamping is used only when the blank thickness is greater than 8 100mm The blank material for stamping is usually in the form of sheet or strip and therefore it is also called sheet metal forming Some non metal sheets such as plywood mica sheet asbestos leather can also be formed by stamping Stamping is widely used in various fields of the metalworking industry and it plays a crucial role in the industries for manufacturing automobiles instruments military parts and household electrical appliances etc The process equipment and die are the three foundational problems that needed to be studied in stamping The characteristics of the sheet metal forming are as follows 1 High material utilization 2 Capacity to produce thin walled parts of complex shape 3 Good interchangeability between stamping parts due to precision in shape and dimension 4 Parts with lightweight high strength and fine rigidity can be obtained 5 High productivity easy to operate and to realize mechanization and automatization The manufacture of the stamping die is costly and therefore it only fits to mass production For the manufacture of products in small batch and rich variety the simple stamping die and the new equipment such as a stamping machining center are usually adopted to meet the market demands The materials for sheet metal stamping include mild steel copper aluminum magnesium alloy and high plasticity alloy steel etc Stamping equipment includes plate shear punching press The former shears plate into strips with a definite width which would be pressed later The later can be used both in shearing and forming 2 Characteristics of stamping forming There are various processes of stamping forming with different working patterns and names But these processes are similar to each other in plastic deformation There are following conspicuous characteristics in stamping 1 The force per unit area perpendicular to the blank surface is not large but is enough to cause the material plastic deformation It is much less than the inner stresses on the plate plane directions In most cases stamping forming can be treated approximately as that of the plane stress state to simplify vastly the theoretical analysis and the calculation of the process parameters 2 Due to the small relative thickness the anti instability capability of the blank is weak under compressive stress As a result the stamping process is difficult to proceed successfully without using the anti instability device such as blank holder Therefore the varieties of the stamping processes dominated by tensile stress are more than dominated by compressive stress 3 During stamping forming the inner stress of the blank is equal to or sometimes less than the yield stress of the material In this point the stamping is different from the bulk forming During stamping forming the influence of the hydrostatic pressure of the stress state in the deformation zone to the forming limit and the deformation resistance is not so important as to the bulk forming In some circumstances such influence may be neglected Even in the case when this influence should be considered the treating method is also different from that of bulk forming 4 In stamping forming the restrain action of the die to the blank is not severs as in the case of the bulk forming such as die forging In bulk forming the constraint forming is proceeded by the die with exactly the same shape of the part Whereas in stamping in most cases the blank has a certain degree of freedom only one surface of the blank contacts with the die In some extra cases such as the forming of the blank on the deforming zone contact with the die The deformation in these regions are caused and controlled by the die applying an external force to its adjacent area Due to the characteristics of stamping deformation and mechanics mentioned above the stamping technique is different form the bulk metal forming The importance or the strength and rigidity of the die in stamping forming is less than that in bulk forming because the blank can be formed without applying large pressure per unit area on its surface Instead the techniques of the simple die and the pneumatic and hydraulic forming are developed Due to the plane stress or simple strain state in comparison with bulk forming more research on deformation or force and power parameters has been done Stamping forming can be performed by more reasonable scientific methods Based on the real time measurement and analysis on the sheet metal properties and stamping parameters by means of computer and some modern testing apparatus research on the intellectualized control of stamping process is also in proceeding It is shown that there is a close relationship between stamping forming and raw material The research on the properties of the stamping forming that is forming ability and shape stability has become a key point in stamping technology development but also enhances the manufacturing technique of iron and steel industry and provides a reliable foundation for increasing sheet metal quality 3 Categories of stamping forming Many deformation processes can be done by stamping the basic processes of the stamping can be divided into two kinds cutting and forming Cutting is a shearing process that one part of the blank is cut from the other It mainly includes blanking punching trimming parting and shaving where punching and blanking are the most widely used Forming is a process that one part of the blank has some displacement from the other It mainly includes deep drawing bending local forming bulging flanging necking sizing and spinning In substance stamping forming is such that the plastic deformation occurs in the deformation zone of the stamping blank caused by the external force The stress state and deformation characteristic of the deformation zone are the basic factors to decide the properties of the stamping forming Based on the stress state and deformation characteristics of the deformation zone the forming methods can be divided into several categories with the same forming properties and be studied systematically The deformation zone in almost all types of stamping forming is in the plane stress state Usually there is no force or only small force applied on the blank surface When is assumed that the stress perpendicular to the blank surface equals to zero two principal stresses perpendicular to each other and act on the blank surface produce the plastic deformation of the material Due to the small thickness of the blank it is assumed approximately the two principal stresses distribute uniformly along the thickness direction Based on this analysis the stress state and the deformation characteristics of the deformation zone in all kinds of stamping forming can be denoted by the points in the coordinates of the plane principal stresses and the coordinates of the corresponding plane principal strains 4 Raw materials for stamping forming There are a lot of raw materials used in stamping forming and the properties of these materials may have large difference The stamping forming can be succeeded only by determining the stamping method the forming parameters and the die structures according to the properties and characteristics of the raw materials The deformation of the blank during stamping forming has been investigated quite thoroughly The relationships between the material properties decided by the chemistry component and structure of the material and the stamping forming has been established clearly Not only the proper material can be selected based on the working condition and usage demand but also the new material can be developed according to the demands of the blank properties during processing the stamping part This is an important domain in stamping forming research The research on the material properties for stamping forming is as follows 1 Definition of the stamping property of the material 2 Method to judge the stamping property of the material find parameters to express the definitely material property of the stamping forming establish the relationship between the property parameters and the practical stamping forming and investigate the testing methods of the property parameters 3 Establish the relationship among the chemical component structure manufacturing process and stamping property The raw materials for stamping forming mainly include various metals and nonmetal plate Sheet metal includes both ferrous and nonferrous metals Although a lot of sheet metals are used in stamping forming the most widely used materials are steel stainless steel aluminum alloy and various composite metal plates 5 Stamping forming property of sheet metal and its assessing method The stamping forming property of the sheet metal is the adaptation capability of the sheet metal to stamping forming It has crucial meaning to the investigation of the stamping forming property of the sheet metal In order to produce stamping forming parts with most scientific economic and rational stamping forming process and forming parameters it is necessary to understand clearly the properties of the sheet metal so as to utilize the potential of the sheet metal fully in the production On the other hand to select plate material accurately and rationally in accordance with the characteristics of the shape and dimension of the stamping forming part and its forming technique is also necessary so that a scientific understanding and accurate judgment to the stamping forming properties of the sheet metal may be achieved There are direct and indirect testing methods to assess the stamping property of the sheet metal Practicality stamping test is the most direct method to assess stamping forming property of the sheet metal This test is done exactly in the same condition as actual production by using the practical equipment and dies Surely this test result is most reliable But this kind of assessing method is not comprehensively applicable and cannot be shared as a commonly used standard between factories The simulation test is a kind of assessing method that after simplifying and summing up actual stamping forming methods as well as eliminating many trivial factors the stamping properties of the sheet metal are assessed based on simplified axial symmetric forming method under the same deformation and stress states between the testing plate and the actual forming states In order to guarantee the reliability and generality of simulation results a lot of factors are regulated in detail such as the shape and dimension of tools for test blank dimension and testing conditions stamping velocity lubrication method and blank holding force etc Indirect testing method is also called basic testing method its characteristic is to connect analysis and research on fundamental property and principle of the sheet metal during plastic deformation and with the plastic deformation parameters of the sheet metal in actual stamping forming and then to establish the relationship between the indirect testing results indirect testing value and the actual stamping forming property forming parameters Because the shape and dimension of the specimen and the loading pattern of the indirect testing are different from the actual stamping forming the deformation characteristics and stress states of the indirect test are different from those of the actual one So the results obtained form the indirect test are not the stamping forming parameters but are the fundamental parameters that can be used to represent the stamping forming property of the sheet metal