沖單孔墊圈模具設(shè)計-沖壓模具【含CAD圖紙和文檔全套】

ZL50裝載機總體及工作裝置設(shè)計

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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 計算沖壓力…………….6 沖裁力………………….6 卸料力………………….6 初定壓力機…………….7 壓力中心……………….7 模刃口尺寸…………….7 6．模具結(jié)構(gòu)設(shè)計……………………….8 7．線切割編程………………………….9 8．參考文獻……………………………11 9．心得體會……………………………12 設(shè)計任務(wù)書 1） 目錄 2） 簡述設(shè)計任務(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)計及材料利用率計算，進行排樣與模具結(jié)構(gòu)及生產(chǎn)率，操作安全和經(jīng)濟性分析，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)計的分析過程 8） 沖壓力，推件力，卸料力的計算過程 和典型結(jié)構(gòu)選擇壓力中心的計算過程 9） 凹模輪廓尺寸計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算過程 12） 其他計算過程及需要說明內(nèi)容 13） 該設(shè)計的優(yōu)缺點及改進措施 14） 設(shè)計所用的參考資料 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， 此沖件在沖裁時應(yīng)注意以下事項 1. φ20mm和φ8mm的孔較小，孔壁給模具設(shè)計和沖裁工藝帶來不便，特別注意材料的金屬流動情況，防止φ20mm和φ8mm凸模彎曲變形 2. φ20mm和φ8mm的周邊和孔壁均勻，模具設(shè)計時應(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點是此沖件沖壓時較為困難之處，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，也給模具裝備帶來了方便，沖件方便，排樣合理，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)向作用和保護作用，為方便操作和取件，選用雙柱可傾壓力機橫向送料，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3－26和公式3－27的條料寬度，因由文獻側(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% 排樣圖 3）計算材料利用率η，由文獻[2]材料通用計算公式η=A。/Ax100% A。－得到制件的總面積 A－ 一個公步的條料面積 η=1256÷1755。6×％100 =71.5% 4）計算沖壓力。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=KLTτ或F沖=LTσ 式中K：系數(shù) K=1.3 L：沖裁周邊長度（mm） τ：材料抗剪強度（Mpa） σ: 材料抗拉強度（Mpa） 由書中表4-12得 σ=362。5（為計算方便取σ=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[2]卸料力和頂料力推件力的計算公式 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[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，查文獻[2]表1-8開式雙柱可推壓力機部分參數(shù)，初選壓力機型號規(guī)格J23-25 6） 計算壓力中心，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，為（0，0） 8）計算凸凹模刃口尺寸，本制件形狀簡單可按分別加工法計算刃口尺寸 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=0.360mm =0.02mm，=0.02mm， 查表3-7得：x=0.75；； 校核間隙：因為Z－Z=0.360－0.246=0.114mm 0.114mm＞||+||=0.04mm 說明凸模公差能滿足||+||≤Z－Z的條件 將已知和查表的數(shù)據(jù)代入公式中去得： dT=8.075mm dA=8.321mm 2、落料： 工件尺寸直徑8mm 查表3-7得x=1,；， 校核間隙：Z－Z=0.36－0.246=0.114mm；||+||=0.05mm 0.114＞0.05mm 凸凹模公差能滿足||+||≤Z－Z的條件 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 ( 1 ) 凹模設(shè)計，因制件形狀簡單，隨有三個公步，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. 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)，此時即可畫裝備圖 （ 2 ）校核壓力機安裝尺寸 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 B B B800 GY L4 D 五：參 考 文 獻 1.冷沖壓技術(shù) 、翁其金、北京、機械工業(yè)出版社、2003 2.冷沖壓模具設(shè)計指導(dǎo)、王芳、北京、機械工業(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 心 得 體 會 為期一個月的畢業(yè)設(shè)計即將結(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)文獻資料的檢索顯得尤為重要。在現(xiàn)代社會中，隨著計算機的普及以及網(wǎng)絡(luò)技術(shù)的發(fā)展，，對于文獻的檢索已經(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, 再次，通過這次畢業(yè)設(shè)計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)計不是簡簡單單的完成了一個課題，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實的基礎(chǔ)。 13 沖 模 件 機 械 加 工 工 藝 過 程 卡 校 名 模具工程學(xué)院 模具名稱 墊板沖壓連續(xù)模 共1頁 凹模 第1頁 材料 名稱 合金工具鋼 毛坯種類 毛坯尺寸 零件數(shù)量 件數(shù) 更改內(nèi)容 牌號 Cr12MoV 鍛 坯 130×110×２０ 50萬件/年 1 序號 工 序 內(nèi) 容 加工車間 設(shè)備名稱 工藝裝備 工時定額 1 下 料 140×110×２０ 備料車間 鋸床 2 鍛 造： 1500 x 900 x 20尺寸公差均為±２ 鍛造車間 空氣錘 3 退 　　 火 鍛造車間 加熱爐 4 校 　　 驗 鍛造車間 5 刨：粗精加工６個面，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：按圖樣檢驗 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