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冷沖壓工藝卡片 產(chǎn)品型號 零 部 件名稱 共 1 頁九江職業(yè)技術(shù)學(xué) 院 冷沖壓工藝卡片 產(chǎn)品名稱 零 部 件型號 第 1 頁 材料牌號及規(guī) 格 材料技術(shù)要求 毛坯尺寸 每毛坯可制件數(shù) 毛坯 質(zhì)量 輔助 材料 10 鋼 1500 x600 x1 條料 1 萬件 工序號 工序名稱 工序內(nèi)容 加 工 簡 圖 設(shè)備 工藝裝備 工 時(shí) 下料 剪床上裁板 600 x90 Q11 6X2500 沖壓 沖孔 落 料 J2325 沖孔 級進(jìn) 模 檢驗(yàn) 按產(chǎn)品圖 紙檢驗(yàn) 編 制 日 期 審 核 日 期 會 簽 日 期 標(biāo) 記 處 數(shù) 更 改 文 件 號 簽字 日期 標(biāo)記 處數(shù) 更 改 文 件 號 簽字 日期 1 目 錄 1 目錄 1 2 任務(wù)書 2 3 工藝分析 3 4 工藝方案的分析與確定 4 排樣圖 4 材料利用率 5 計(jì)算沖壓力 6 沖裁力 6 卸料力 6 初定壓力機(jī) 7 壓力中心 7 模刃口尺寸 7 6 模具結(jié)構(gòu)設(shè)計(jì) 8 7 線切割編程 9 8 參考文獻(xiàn) 11 9 心得體會 12 2 設(shè)計(jì)任務(wù)書 1 目錄 2 簡述設(shè)計(jì)任務(wù)及說明要求 3 沖件的工藝分析 4 工藝方案的制定及分析比較 5 排樣設(shè)計(jì)及材料利用率計(jì)算 進(jìn)行排樣與模具 結(jié)構(gòu)及生產(chǎn)率 操作安全和經(jīng)濟(jì)性分析 然后 確定排樣方案畫出排樣圖 6 寫工藝規(guī)程卡 7 模具結(jié)構(gòu)設(shè)計(jì)的分析過程 8 沖壓力 推件力 卸料力的計(jì)算過程 和典型結(jié)構(gòu)選擇壓力中心的計(jì)算過程 9 凹模輪廓尺寸計(jì)算過程和典型組合的選擇 10 沖模的主要零件的結(jié)構(gòu)形狀材料公 差的要求及技術(shù)要求說明 11 凸凹模工作刃口尺寸計(jì)算過程 12 其他計(jì)算過程及需要說明內(nèi)容 13 該設(shè)計(jì)的優(yōu)缺點(diǎn)及改進(jìn)措施 14 設(shè)計(jì)所用的參考資料 一 工藝分析 沖壓材料為 Q235 鋼 料厚 t 3mm 沖件尺寸精度為 3 IT12 級 形狀并不復(fù)雜 尺寸大小為小型沖件 年產(chǎn) 50 萬件 屬于普通沖件 此沖件在沖裁時(shí)應(yīng)注意以下事項(xiàng) 1 20mm 和 8mm 的孔較小 孔壁給模具設(shè)計(jì)和沖裁工 藝帶來不便 特別注意材料的金屬流動情況 防止 20mm 和 8mm 凸模彎曲變形 2 20mm 和 8mm 的周邊和孔壁均勻 模具設(shè)計(jì)時(shí)應(yīng)妥 善處理 3 沖件較小 故必須考慮到工人的操作安全性 以上 3 點(diǎn)是此沖件沖壓時(shí)較為困難之處 要想得到合格 沖件并適應(yīng) 50 萬件生產(chǎn)數(shù)量的需要 提高模具壽命是 必須處理好的問題 二 工藝方案的分析與確定 從工件的結(jié)構(gòu)形狀可知 其基本工序有沖孔和落料兩種 但根據(jù)先后順序的不同排列 可設(shè)定以下方案 1 沖孔 沖孔 落料 級進(jìn)沖壓 2 沖孔 落料 單工序沖壓 方案 2 屬于單工序沖壓 由于此沖壓件生產(chǎn)批量很大 沖 件較小 為了提 高生產(chǎn)效率和材料的利用率故不 宜采用 方案 1 也屬于單工序沖壓 此方案較好 即解決了難點(diǎn) 也給模具裝備帶來了方便 沖件方便 排樣合理 4 沖件也平整 故方案合適 三 模具結(jié)構(gòu)形式的確定 因制件材料較薄 為保證制作平整 采用彈壓卸料裝 置 他還可以對沖孔小凸模起導(dǎo)向作用和保護(hù)作用 為方 便操作和取件 選用雙柱可傾壓力機(jī)橫向送料 因制件薄 而窄 故采用側(cè)刃定位 生產(chǎn)效率高材料消耗也不大 工件圖 綜上所述 由模具設(shè)計(jì)指導(dǎo)表 5 3 5 7 選用彈壓卸料 橫向送料典型組合形式 對角導(dǎo)柱滑動導(dǎo)向模架 畫排樣圖 因由冷沖壓技術(shù)表 3 14 查的最小搭邊值 側(cè)邊 a 2 0 工 件之間 b 1 8 步距 s 21 8 由冷沖壓技術(shù)公式 3 25 和 5 3 26 和公式 3 27 的條料寬度 因由文獻(xiàn)側(cè)刃條料寬度 尺寸 B mm 確定公式得條料寬度 B B 1 5a C 2F 2x1 5 8 2x2 87mm 導(dǎo)料板間的距離 X c 1 5 a nF z 8 1 5 x2 2 x2 0 5 87 5 C 條料寬度的最大沖裁力 a 側(cè)搭邊值 F 側(cè)刃沖切的料邊寬度 n 側(cè)刃數(shù) z 沖裁前的條料寬度與板料間的間隙 如圖所示排樣圖 查模具設(shè)計(jì)指導(dǎo)書 4 8 選板料的規(guī)格 1500 x 900 x 2 mm 每塊可剪 47x 900mm 的規(guī)格 條料剪切率 77 2 6 排樣圖 3 計(jì)算材料利用率 由文獻(xiàn) 2 材料通用計(jì)算公式 A Ax100 A 得到制件的總面積 A 一個(gè)公步的條料面積 1256 1755 6 100 71 5 4 計(jì)算沖壓力 完成本制作所需的沖壓力 由沖裁力 卸料力 推件力組成 1 沖裁力 F 沖 KLT 或 F 沖 LT 式中 K 系數(shù) K 1 3 L 沖裁周邊長度 mm 材料抗剪強(qiáng)度 Mpa 材料抗拉強(qiáng)度 Mpa 由書中表 4 12 得 7 362 5 為計(jì)算方便取 80 Mpa F 沖 80 2 2 8 3 14 8 3 14 2 43 8 210KN 2 卸料力和推件力 F 推 由文獻(xiàn) 2 卸料力和頂料力推 件力的計(jì)算公式 F 卸 K 卸 F 沖 F 推 K 推 F 沖 n 式中 K 推 K 卸 系數(shù) 查文獻(xiàn) 2 表 2 16 卸料力 推件 力和頂件力的系數(shù)得 K 卸 F 推 0 05 n 卡在凹模直壁洞口內(nèi)的制件件數(shù)一般卡 3 5 件本題 取 n 4 F 卸 K 卸 F 沖 0 05 210 10 5KN F 推 nK 推 F 沖 4 0 55 210 46KN F F 卸 F 推 F 沖 210 10 5 46 266 5KN 5 初選壓力機(jī) 查文獻(xiàn) 2 表 1 8 開式雙柱可推壓力機(jī)部 分參數(shù) 初選壓力機(jī)型號規(guī)格 J23 25 8 6 計(jì)算壓力中心 本例由于圖形排列規(guī)則 故可采用解 析法求壓力中心較方便建立工件坐標(biāo)系如圖所示 7 由于這圖形是對稱的 所以它的壓力中心在原點(diǎn) 為 0 0 8 計(jì)算凸凹模刃口尺寸 本制件形狀簡單可按分別加工法 計(jì)算刃口尺寸 1 沖孔 工件尺寸孔直徑 8mm 由表 3 5 3 6 3 7 查得 Z 0 246mm Z 0 360mmminmax 0 02mm 0 02mm T A 查表 3 7 得 x 0 75 0min TxdT AdTA 0min 校核間隙 因?yàn)?Z Z 0 360 0 246 0 114mmmaxi 0 114mm 0 04mmT A 說明凸模公差能滿足 Z Z 的條件 T Amaxin 將已知和查表的數(shù)據(jù)代入公式中去得 dT 8 075mm 9 dA 8 321mm 2 落料 工件尺寸直徑 8mm 查表 3 7 得 x 1 75 01 xAxDA 0ma 0min TZDAT 校核間隙 Z Z 0 36 0 246 0 114mm 0 05mmmain 0 114 0 05mm 凸凹模公差能滿足 Z Z 的條件T Amaxin 將已知和查表得到的數(shù)據(jù)代入公式得 dA 39 99mm dT 39 744mm 四 模具結(jié)構(gòu)設(shè)計(jì) 1 凹模設(shè)計(jì) 因制件形狀簡單 隨有三個(gè)公步 但 總體積并不大 選用整體式矩形凹模較為合理 因生產(chǎn)批 量為中批 由查模具設(shè)計(jì)指導(dǎo) 3 5 表選用 10 鋼為凹模材 料 1 確定凹模的厚度值 由冷沖壓技術(shù) 凹模厚的確 定 3 5 公式 確定厚度 H 值 K 0 5 查資料 s 8mm H K s 0 5 X 8 20 mm 2 確定凹模的周邊尺寸 L X B 由模具設(shè)計(jì)指導(dǎo) 3 43 矩形凹模標(biāo)準(zhǔn)可以查到靠近凹模周界尺寸 125mm 100mm 20mm 10 選擇模架及確定其他沖模零件尺寸 由凹模周界尺寸 及模架閉和高度在一定的范圍之間 查書 5 7 選用對角導(dǎo)柱 模架 標(biāo)記為 125 100 130 GB T2851 1 1990 并可以根 據(jù)此標(biāo)準(zhǔn)畫出模架圖 類似也可以查出其它零件參數(shù) 此 時(shí)即可畫裝備圖 2 校核壓力機(jī)安裝尺寸 模座外形尺寸為 250 230 閉合 高度為 130 由為 文選表 1 2j23 25 型壓力機(jī)工作尺寸 370 560 最大閉合 為 270 連桿調(diào)節(jié)長度為 55mm 故在工作臺上加 20 18mm 墊板 模柄孔尺寸也本副模具所述模柄尺寸相符 3 線切割編程 B B B2000 GY L2 B B 2000 B2000 GX SR1 B B B2000 GY L4 A B B B800 GY L2 B B800 B1600 GX SR1 B B B800 GY L4 A B B B800 GY L2 B B800 B16000 GX SR1 11 B B B800 GY L4 D 五 參 考 文 獻(xiàn) 1 冷沖壓技術(shù) 翁其金 北京 機(jī)械工業(yè)出版社 2003 2 冷沖壓模具設(shè)計(jì)指導(dǎo) 王芳 北京 機(jī)械工業(yè)出版社 2003 3 模具制造工藝學(xué) 郭鐵良 北京 高等教育出版 12 心 得 體 會 為期一個(gè)月的畢業(yè)設(shè)計(jì)即將結(jié)束 也就意味著我的大學(xué)生活 即將結(jié)束 在這期間里學(xué)到了很多知識和技能 通過這次畢業(yè)設(shè)計(jì)使我掌握了做科學(xué)研究的基本方法和思路 為今后的工作打下了基礎(chǔ) 現(xiàn)將感受總結(jié)如下 首先 我學(xué)會了對相關(guān)科技文獻(xiàn)的檢索 一切科學(xué)研究都是 建立在前人研究的基礎(chǔ)之上的 因此 對于相關(guān)文獻(xiàn)資料的檢 索顯得尤為重要 在現(xiàn)代社會中 隨著計(jì)算機(jī)的普及以及網(wǎng)絡(luò) 技術(shù)的發(fā)展 對于文獻(xiàn)的檢索已經(jīng)從圖書館的紙質(zhì)資料轉(zhuǎn)移 到網(wǎng)絡(luò)平臺下的電子文檔 其次 對于各種工具軟件的熟練使用也是科學(xué)研究中所必不 可少的 在這次畢業(yè)設(shè)計(jì)中 我主要使用的是 AUTO CAD 這一工 具軟件 該軟件可用于圖形設(shè)計(jì) 再次 通過這次畢業(yè)設(shè)計(jì)還使我了解了科技論文的寫作規(guī)范 熟悉了 offic 系列軟件在文字處理與排版等方面的使用 總之 這次畢業(yè)設(shè)計(jì)不是簡簡單單的完成了一個(gè)課題 而是 使我初步的掌握了科學(xué)研究的步驟與方法 鞏固了我的專業(yè)知 識 練習(xí)了我的實(shí)際操作能力 鍛煉了我分析解決問題的能力 為今后的科研工作打下了堅(jiān)實(shí)的基礎(chǔ) 13 沖 模 件 機(jī) 械 加 工 工 藝 過 程 卡 墊板沖壓連續(xù)模 共 1 頁校 名 模具工程學(xué)院 模具名稱 凹模 第 1 頁 名稱 合金工具鋼 毛坯種類 毛坯尺寸 零件數(shù)量 件數(shù) 材料 牌號 Cr12MoV 鍛 坯 130 110 50 萬件 年 1 更改內(nèi)容 序號 工 序 內(nèi) 容 加工車間 設(shè)備名稱 工藝裝備 工時(shí)定 額 1 下 料 140 110 備料車間 鋸床 2 鍛 造 1500 x 900 x 20 尺寸公差均為 鍛造車間 空氣錘 3 退 火 鍛造車間 加熱爐 4 校 驗(yàn) 鍛造車間 5 刨 粗精加工 個(gè)面 單面余量 0 3 0 4mm 模具車間 銑床或刨床 虎 鉗 6 磨 磨上下平面兩基準(zhǔn)至圖樣尺寸 模具車間 磨床 M7120A 7 劃線 劃中心線 各螺孔銷孔 型孔的輪廓 模具車間 畫線平臺 8 加工各孔 各螺釘 銷釘與下模座配鉆配鉸 模具車間 立銑 Z525 平行夾頭 9 銑 銑出落料孔 模具車間 立銑 X53K 虎 鉗 10 熱處理 檢驗(yàn)硬度為 60 64HRC 熱處理車間 加熱爐油槽 11 磨 精磨上下面 表面 Ra 達(dá)圖樣要求 模具車間 M120A 12 劃線 各孔型孔 彎曲型槽 模具車間 畫線平臺 13 電加工 電火花線切割沖裁型孔 模具車間 電火花 工件墊板 14 修整 修整型腔 模具車間 電動拋光儀 15 檢驗(yàn) 按圖樣檢驗(yàn) 16 入 庫 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