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河南機電高等?？茖W校
畢業(yè)設計（論文）任務書
系 部： 材料工程系
專 業(yè) 模具設計與制造
學生姓名: 鄭 圣 學 號: 0312149
設計(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 教 師: 楊占堯 教授
發(fā)任務書日期: 2006 年 4 月 3 日
畢 業(yè) 設 計（論 文）任 務 書
1．本畢業(yè)設計（論文）課題來源及應達到的目的：
模具畢業(yè)設計是一個重要的專業(yè)教學環(huán)節(jié)，這個數(shù)學環(huán)節(jié)的目的：
(1)幫助學生具體運用和鞏固《模具設計與制造》課程及相關的理論知識，了解設計沖壓模的一般程序。
(2)使學生能夠熟練地運用有關技術資料，如《冷沖模國家標準》、《模具設計與制造簡明手冊》、《冷沖壓模具結構圖冊》及其它有關規(guī)范等。
(3)訓練學生初步設計冷沖壓模具的能力，為以后的工作打下初步的基礎。
2．本畢業(yè)設計（論文）課題任務的內容和要求（包括原始數(shù)據(jù)、技術要求、工作要求等）：
沖壓模課程設計按以下內容進行。
(1)擬定沖壓工序安排方案、畫出沖壓工序圖、畫出待設計模具的排樣圖
(2)計算沖裁力、確定模具壓力中心、計算凹模周界、確定待設計模具的有關結構要素、選用模具典型組合等，初選壓力機噸位；
(3)考慮工廠的實際情況；
(4)確定壓力機噸位；
(5)模具模板與作用原理和公差；
(6)沖裁間隙；
(7)設計及繪制模具裝配圖；
(8)設計及繪制模具零件圖；
(9)設計及繪制模具模板圖；
(10)按規(guī)定格式編制設計說明書；
(11)課程設計面批后或答辯。
所在專業(yè)審查意見：
負責人：
年 月 日
系部意見：
系領導：
年 月 日
畢業(yè)設計說明書目錄
緒 論 1
第1章 設計內容及要求 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 主要設計計算 6
3.1 排樣方式的確定 6
3.2 毛胚的確定 6
3.3 沖裁力的計算 7
3.3.1沖裁力 7
3.3.2 壓力中心的確定及相關尺寸的計算 8
3.4 工作零件刃口尺寸計算 8
第4章 模具總體設計及主要零部件設計 11
4.1 模具結構的選擇 11
4.2 卸料彈簧的設計與計算 11
4.3沖壓設備的選擇 12
4.4送料機機型﹑功能規(guī)格名稱﹑送料寬度﹑送料厚度 13
4.5 模具的總體設計 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 導向方式的選擇 15
4.6 主要零部件的設計 15
4.6.１ 工作零件的結構設計 15
4.6.2 落料凸模的設計 15
4.6.3 落料凹模的設計 16
4.6.4 定位零件的設計 16
4.7 卸料部件的設計 16
4.7.1 卸料板的設計 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﹑硬度及功能 18
4.9 模具零件公差及間隙標準 20
4.10 沖裁刃口要求及沖裁間隙標準 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 模具的裝配和調整 23
畢業(yè)設計說明書目錄
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整 24
5.4 模具設計要點 26
5.4.1 送料 26
5.4.2 出料 27
5.4.3 精度 27
結 論 28
致 謝 29
參考文獻 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。模具設計必須滿足工藝要求，最終滿足產(chǎn)品的形狀、尺寸和精度的要求。因此沖壓設計師必須掌握沖壓工藝，包括沖壓工藝的分類、各種工藝計算、工藝制訂等基礎知識，而后才可以選擇模具的類型，進行模具設計，使模具的類型表面質量、尺寸精度結構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、擴孔等。
冷沖壓模具是沖壓生產(chǎn)的主要工藝設備。沖壓件的表面質量、尺寸精度、生產(chǎn)率以及經(jīng)濟效益等，與模具結構及設計是否合理關系極大。
關鍵詞: 落料、塑性變形、工藝計算、工藝制訂、表面質量、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
機械加工工藝過程卡
機械加工工藝過程卡片
產(chǎn)品型號
零（部）件圖號
02
產(chǎn)品名稱
凹模
零（部）件名稱
凹模
材料牌號
Cr12MoV
毛坯
種類
卷料
毛坯外型尺寸
27×35×25
備注
凸模配制
工序號
工序名稱
工 序 內 容
車間
工段
設備
工 藝 裝 備
工時
準終
單件
1
下料
φ140，長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
消除鍛造后的內應力，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面，對角尺達到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，將紙帶輸入計算機
金工
設計日期
審核日期
標準化日期
會簽
日期
13
研光
是工作表面光潔
金工
標記
記數(shù)
更改文
件號
簽字
日期
標記
處數(shù)
更該文件號
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)下進行，因此也稱為冷沖壓。只有當板材厚度超過8~100mm時，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行加工。
沖壓廣泛應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備和模具三類基本問題。
? 板材沖壓具有下列特點：
（1）．高的材料利用率。
（2）．可加工薄壁、形狀復雜的零件。
（3）．沖壓件在形狀和尺寸方面的互換性好。
（4）．能獲得質量輕而強度高、剛性好的零件。
（5）．生產(chǎn)率高，操作簡單，容易實現(xiàn)機械化和自動化。
沖壓模具制作成本高，因此適合大批量生產(chǎn)。對于小批量、多品種生產(chǎn)，常采用簡易沖模，同時引進沖壓加工中心等新型設備，以滿足市場求新求變的需求。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
生產(chǎn)時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，但塑性變形本質是相同的。沖壓成形具有如下幾個非常突出的特點。
（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遠小于板面方向上的內應力，所以大多數(shù)的沖壓變形都可以近似地當作平面應力狀態(tài)來處理，使其變形力學的分析和工藝參數(shù)的計算大呢感工作都得到很大的簡化。
（2）．由于沖壓成形用的板材毛胚的相對厚度很小，在壓應力作用下的抗失穩(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，以拉應力作用為主的伸長類沖壓成形過程多于以壓應力作用為主的壓縮類成形過程。
（3）．沖壓成形時，板材毛胚內應力的數(shù)值等于或小于材料的屈服應力。在這一點上，沖壓成形與體積成形的差別很大。因此，在沖壓成形時變形區(qū)應力狀態(tài)中的靜水壓力成分對成形極限與變形抗力的影響，已失去其在體積成形時的重要程度，有些情況下，甚至可以完全不予考慮，即使有必要考慮時，其處理方法也不相同。
（4）．在沖壓成形時，模具對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毛胚進行全面接觸而實現(xiàn)的強制成形。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，常常是只有一個表面與模具接觸，甚至有時存在板材兩側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其相鄰部分施加的外力實現(xiàn)其控制作用的。例如，球面和錐面零件成形時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方面的特點，致使沖壓技術也形成了一些與體積成形不同的特點。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，所以在沖壓技術中關于模具強度與剛度的研究并不十分重要，相反卻發(fā)展了學多簡易模具技術。
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。因沖壓成形時的平面應力狀態(tài)或更為單純的應變狀態(tài)（與體積成形相比），當前對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，有條件運用合理的科學方法進行沖壓加工。借助于電子計算機與先進的測試手段，在對板材性能與沖壓變形參數(shù)進行實時測量與分析基礎上，實現(xiàn)沖壓過程智能化控制的研究工作也在開展。人們在對沖壓成形過程有離開較為深入的了解后，已經(jīng)認識到?jīng)_壓成型與原材料有十分密切的關系。所以，對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的一個重要內容。對板材沖壓性能的研究工作不僅是沖壓技術發(fā)展的需要，而且也促進了鋼鐵工業(yè)生產(chǎn)技術的發(fā)展，為其提高板材的質量提供了一個可靠的基礎與依據(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、落料應用最廣。變形工序是使胚料的一部分相對于另一部分產(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)生相應的塑性變形，所以變形區(qū)內的應力狀態(tài)和變形特點景象的沖壓成形分類，可以把成形性質相同的成形方法概括成同一個類型并進行體系化的研究。
絕大多數(shù)沖壓成形時毛胚變形區(qū)均處于平面應力狀態(tài)。通常認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，所以可以認為垂直于板面方向上的應力為零，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主應力。由于板厚較小，通常都近似地認為這兩個主應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，在平面應力的應力坐標系中與相應的兩向應變坐標系中以應力與應變坐標決定的位置來表示。
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，采用不同的沖壓成形方法、工藝參數(shù)和模具結構，才能達到?jīng)_壓加工的目的。由于人們對沖壓成形過程板材毛胚的變形行為有了較為深入的認識，已經(jīng)相當清楚的建立了由原材料的化學成分、組織等因素所決定的材料性能與沖壓成形之間的關系，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行原材料的設計工作，而且也根據(jù)沖壓件加工過程對板材性能的要求進行新型材料的開發(fā)工作，這是沖壓技術在原材料研究方面的一個重要方向。對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)與實際沖壓成形間的關系，以及沖壓性能參數(shù)的測試方法等。
（3）建立原材料的化學成分、組織和制造過程與沖壓性能之間的關系。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、鋁合金板及各種復合金屬板。
5．板材沖壓性能及其鑒定方法
? ? 板材是指對沖壓加工的適應能力。對板材沖壓性能的研究具有飛行重要的意義。為了能夠運用最科學與最經(jīng)濟合理的沖壓工藝過程與工藝參數(shù)制造出沖壓零件，必須對作為加工對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，也必須對板材的沖壓性能有一個科學的認識與正確的判斷。評定板材沖壓性能的方法有直接試驗法與間接試驗法。
? ?實物沖壓試驗是最直接的板材沖壓性能的評定方法。利用實際生產(chǎn)設備與模具，在與生產(chǎn)完全相同的條件下進行實際沖壓零件的性能評定，當然能夠的最可靠的結果。但是，這種評定方法不具有普遍意義，不能作為行業(yè)之間的通用標準進行信息的交流。
? ?模擬試驗是把生產(chǎn)中實際存在的沖壓成形方法進行歸納與簡單化處理，消除許多過于復雜的因素，利用軸對稱的簡化了的成形方法，在保證試驗中板材的變形性質與應力狀態(tài)都與實際沖壓成形相同的條件下進行的沖壓性能的評定工作。為了保證模擬試驗結果的可靠性與通用性，規(guī)定了私分具體的關于試驗用工具的幾何形狀與尺寸、毛胚的尺寸、試驗條件（沖壓速度、潤滑方法、壓邊力等）。
? ?間接試驗法也叫做基礎試驗法。間接試驗法的特點是：在對板材在塑性變形過程中所表現(xiàn)出的基本性質與規(guī)律進行分析與研究的基礎上，進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，建立間接試驗結果（間接試驗值）與具體的沖壓成形性能（工藝參數(shù)）之間的相關性。由于間接試驗時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，所以它的變形性質和應力狀態(tài)也不同于沖壓變形。因此間接試驗所得的結果（試驗值）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.