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冷沖模具使用壽命的影響及對策 沖壓模具概述 沖壓模具 在冷沖壓加工中 將材料 金屬或非金屬 加工成零件 或半成品 的 一種特殊工藝裝備 稱為冷沖壓模具 俗稱冷沖模 沖壓 是在室溫下 利用安裝在壓 力機(jī)上的模具對材料施加壓力 使其產(chǎn)生分離或塑性變形 從而獲得所需零件的一種壓 力加工方法 沖壓模具的形式很多 一般可按以下幾個主要特征分類 根據(jù)工藝性質(zhì)分類 1 沖裁模 沿封閉或敞開的輪廓線使材料產(chǎn)生分離的模具 如落料模 沖孔模 切斷模 切口模 切邊模 剖切模等 2 彎曲模 使板料毛坯或其他坯料沿著直線 彎曲線 產(chǎn)生彎曲變形 從而獲得 一定角度和形狀的工件的模具 3 拉深模 是把板料毛坯制成開口空心件 或使空心件進(jìn)一步改變形狀和尺寸的 模具 4 成形模 是將毛坯或半成品工件按圖凸 凹模的形狀直接復(fù)制成形 而材料本 身僅產(chǎn)生局部塑性變形的模具 如脹形模 縮口模 擴(kuò)口模 起伏成形模 翻邊模 整 形模等 根據(jù)工序組合程度分類 1 單工序模 在壓力機(jī)的一次行程中 只完成一道沖壓工序的模具 2 復(fù)合模 只有一個工位 在壓力機(jī)的一次行程中 在同一工位上同時(shí)完成兩道或 兩道以上沖壓工序的模具 3 級進(jìn)模 也稱連續(xù)模 在毛坯的送進(jìn)方向上 具有兩個或更多的工位 在壓 力機(jī)的一次行程中 在不同的工位上逐次完成兩道或兩道以上沖壓工序的模具 沖冷沖模全稱為冷沖壓模具 冷沖壓模具是一種應(yīng)用于模具行業(yè)冷沖壓模具及其配件所需高性能結(jié)構(gòu)陶瓷材料的 制備方法 高性能陶瓷模具及其配件材料由氧化鋯 氧化釔粉中加鋁 鐠元素構(gòu)成 制 備工藝是將氧化鋯溶液 氧化釔溶液 氧化鐠溶液 氧化鋁溶液按一定比例混合配成母 液 滴入碳酸氫銨 采用共沉淀方法合成模具及其配件陶瓷材料所需的原材料 反應(yīng)生 成的沉淀經(jīng)濾水 干燥 煅燒得到高性能陶瓷模具及其配件材料超微粉 再經(jīng)過成型 燒結(jié) 精加工 便得到高性能陶瓷模具及其配件材料 本發(fā)明的優(yōu)點(diǎn)是本發(fā)明制成的冷 沖壓模具及其配件使用壽命長 在沖壓過程中未出現(xiàn)模具及其配件與沖壓件產(chǎn)生粘結(jié)現(xiàn) 象 沖壓件表面光滑 無毛刺 完全可以替代傳統(tǒng)高速鋼 鎢鋼材料 冷沖模具主要零件 冷沖模具是沖壓加工的主要工藝裝備 沖壓制件就是靠上 下模具的相對運(yùn)動來完成的 加工時(shí)由于上 下模具之間不斷地分合 如果操作工人的手指不斷進(jìn)入或停留在模具閉 合區(qū) 便會對其人身安全帶來嚴(yán)重威脅 一 模具的主要零件 作用及安全要求 1 工作零件凸凹模是直接使坯料成形的工作零件 因此 它是模具上的關(guān)鍵零件 凸凹 模不但精密而且復(fù)雜 它應(yīng)滿足如下要求 1 應(yīng)有足夠的強(qiáng)度 不能在沖壓過程中斷裂或破壞 2 對其材料及熱處理應(yīng)有適當(dāng)要求 防止硬度太高而脆裂 2 定位零件定位零件是確定坯件安裝位置的零件 有定位銷 板 擋料銷 板 導(dǎo)正 銷 導(dǎo)料板 定距側(cè)刀 側(cè)壓器等 設(shè)計(jì)定位零件時(shí)應(yīng)考慮操作方便 不應(yīng)有過定位 位置要便于觀察 最好采用前推定位 外廓定位和導(dǎo)正銷定位等 3 壓料 卸料及出料零件壓料零件有壓邊圈 壓料板等 壓邊圈可對拉延坯料加壓邊力 從而防止坯料在切向壓力的作用下拱起而形成皺褶 壓料板的作用是防止坯料移動和彈跳 頂出器 卸料板的作用是便于出件和清理廢料 它們由彈簧 橡膠和設(shè)備上的氣墊推桿支撐 可上下運(yùn)動 頂出件設(shè)計(jì)時(shí)應(yīng)具有足夠的 頂出力 運(yùn)動要有限位 卸料板應(yīng)盡量縮小閉合區(qū)域或在操作位置上銑出空手槽 暴露 的卸料板的四周應(yīng)設(shè)有防護(hù)板 防止手指伸入或異物進(jìn)入 外露表面棱角應(yīng)倒鈍 4 導(dǎo)向零件導(dǎo)柱和導(dǎo)套是應(yīng)用最廣泛的一種導(dǎo)向零件 其作用是保證凸凹模在沖壓工作 時(shí)有精確的配合間隙 因此 導(dǎo)柱 導(dǎo)套的間隙應(yīng)小于沖裁間隙 導(dǎo)柱設(shè)在下模座 要 保證在沖程下死點(diǎn)時(shí) 導(dǎo)柱的上端面在上模板頂面以上最少 5 至 10 毫米 導(dǎo)柱應(yīng)安排在 遠(yuǎn)離模塊和壓料板的部位 使操作者的手臂不用越過導(dǎo)柱送取料 5 支承及夾持零件它包括上下模板 模柄 凸凹模固定板 墊板 限位器等 上下模板是冷沖模具的基礎(chǔ)零件 其他各種零件都分別安裝固定在上面 模板的平 面尺寸 尤其是前后方向應(yīng)與制件相適應(yīng) 過大或過小均不利于操作 有些模具 落料 沖孔類模具 為了出件方便 需在模架下設(shè)墊板 這時(shí)墊板最好 與模板之間用螺釘連接在一起 兩墊板的厚度應(yīng)絕對相等 墊板的間距以能出件為準(zhǔn) 不要太大 以免模板斷裂 6 緊固零件它包括螺釘 螺母 彈簧 柱銷 墊圈等 一般都采用標(biāo)準(zhǔn)件 冷沖模具的 標(biāo)準(zhǔn)件用量較多 設(shè)計(jì)選用時(shí)應(yīng)保證緊固和彈性頂出的需要 避免緊固件暴露在表面操 作位置上 防止碰傷人手和妨礙操作 冷沖模具的發(fā)展 改革開放以來 隨著國民經(jīng)濟(jì)的高速發(fā)展 市場對冷沖模具的需求量不斷增長 近 年來 冷沖模具工業(yè)一直以 15 左右的增長速度快速發(fā)展 冷沖模具工業(yè)企業(yè)的所有制成 分也發(fā)生了巨大變化 除了國有專業(yè)模具廠外 集體 合資 獨(dú)資和私營也得到了快速 發(fā)展 隨著與國際接軌的腳步不斷加快 市場競爭的日益加劇 人們已經(jīng)越來越認(rèn)識到產(chǎn) 品質(zhì)量 成本和新產(chǎn)品的開發(fā)能力的重要性 而冷沖模具制造是整個鏈條中最基礎(chǔ)的要 素之一 冷沖模具制造技術(shù)現(xiàn)已成為衡量一個國家制造業(yè)水平高低的重要標(biāo)志 并在很 大程度上決定企業(yè)的生存空間 近年許多冷沖模具企業(yè)加大了用于技術(shù)進(jìn)步的投資力度 將技術(shù)進(jìn)步視為企業(yè)發(fā)展 的重要動力 一些國內(nèi)模具企業(yè)已普及了二維 CAD 并陸續(xù)開始使用 UG Pro Engineer I DEAS Euclid IS 等國際通用軟件 個別廠家還引進(jìn)了 Moldflow C Flow DYNAFORM Optris 和 MAGMASOFT 等 CAE 軟件 并成功應(yīng)用于沖壓模 的設(shè)計(jì)中 以汽車覆蓋件模具為代表的大型沖壓模具的制造技術(shù)已取得很大進(jìn)步 東風(fēng)汽車公司 模具廠 一汽模具中心等模具廠家已能生產(chǎn)部分轎車覆蓋件模具 此外 許多研究機(jī)構(gòu) 和大專院校開展模具技術(shù)的研究和開發(fā) 經(jīng)過多年的努力 在模具 CAD CAE CAM 技術(shù)方 面取得了顯著進(jìn)步 在提高模具質(zhì)量和縮短模具設(shè)計(jì)制造周期等方面做出了貢獻(xiàn) 雖然中國冷沖模具工業(yè)在過去十多年中取得了令人矚目的發(fā)展 但許多方面與工業(yè)發(fā) 達(dá)國家相比仍有較大的差距 例如 精密加工設(shè)備在冷沖模具加工設(shè)備中的比重比較低 CAD CAE CAM 技術(shù)的普及率不高 許多先進(jìn)的模具技術(shù)應(yīng)用不夠廣泛等等 致使相當(dāng)一部 分大型 精密 復(fù)雜和長壽命冷沖模具依賴進(jìn)口 隨著科學(xué)技術(shù)的不斷進(jìn)步 現(xiàn)代工業(yè)產(chǎn)品的生產(chǎn)日益復(fù)雜與多樣化 產(chǎn)品性能和質(zhì)量 也在不斷提高 因而對冷沖壓技術(shù)提出了更高的要求 為了使冷沖壓技術(shù)能適應(yīng)各工業(yè)部 門的需要 冷沖壓技術(shù)自身也在不斷革新和發(fā)展 冷沖壓技術(shù)的發(fā)展思路就是盡可能地完 善和擴(kuò)充冷沖壓工藝的優(yōu)點(diǎn) 克服其缺點(diǎn) 在冷沖壓技術(shù)的發(fā)展過程中 應(yīng)注意以下幾方面 1 冷沖壓技術(shù)的發(fā)展過程中應(yīng)正確地確定工藝參數(shù)及冷沖模具工作部分的形狀與尺寸 提高沖壓件的質(zhì)量 縮短新產(chǎn)品試制周期 應(yīng)在加強(qiáng)沖壓成形理論研究的基礎(chǔ)上 使沖壓 成形理論達(dá)到能對生產(chǎn)實(shí)際起指導(dǎo)作用 逐步建立起一套密切結(jié)合生產(chǎn)實(shí)際的先進(jìn)的工藝 分析計(jì)算方法 國外已開始采用彈塑性有限元法對汽車覆蓋零件的成形過程進(jìn)行應(yīng)力應(yīng)變 分析和計(jì)算機(jī)模擬 以預(yù)測某一工藝方案對零件成形的可能性和可能出現(xiàn)的問題 2 加快產(chǎn)品更新?lián)Q代 克服模具設(shè)計(jì)周期長的缺點(diǎn) 應(yīng)大力開展模具計(jì)算機(jī)輔助設(shè)計(jì)和制 造 CAD CAM 技術(shù)的研究 在我國 目前要特別注意加強(qiáng)多工位級進(jìn)模 CAD CAM 技術(shù)的研究 3 滿足大量生產(chǎn)需要以及減輕勞動強(qiáng)度 應(yīng)加強(qiáng)冷沖壓生產(chǎn)的機(jī)械化和自動化研究 使一 般中 小件能在高速壓力機(jī)上采用多工位級進(jìn)模生產(chǎn) 達(dá)到生產(chǎn)高度自動化 進(jìn)一步提高 沖壓的生產(chǎn)率 4 擴(kuò)大冷沖壓生產(chǎn)的運(yùn)用范圍 使冷沖壓既適合大量生產(chǎn) 也適合小批量生產(chǎn) 既能生產(chǎn) 一般精度的產(chǎn)品 也能生產(chǎn)精密零件 應(yīng)注意開發(fā)如精密沖裁 特別是厚料精沖 高能成 形 軟模成形 施壓和超塑性加工等新成形工藝 還要推廣簡易模 軟模和低熔點(diǎn)合金模 通用組合模 數(shù)控沖床等設(shè)備的運(yùn)用 此外 對沖壓板料性能的改進(jìn) 模具新材料 模具新加工方法的開發(fā)也應(yīng)進(jìn)一步加強(qiáng) 冷沖模具使用壽命的影響及對策 冷沖模具的使用壽命是以沖制出的工件數(shù)量來計(jì)算的 影響冷沖模壽命的因素很多 主要有模具結(jié)構(gòu)設(shè)計(jì) 制造模具所用凸模和凹模的材料 模具的熱處理質(zhì)量與表面強(qiáng)化 沖模零件的制造精度和冷沖壓材料的選取 除此之外 還有沖模的安裝 調(diào)整 使用以 及維修等 1 模具設(shè)計(jì)對壽命的影響 1 排樣設(shè)計(jì)的影響排樣方法與搭邊值對模具壽命的影響很大 過小的搭邊值 往往 是造成模具急劇磨損和凸 凹模啃傷的重要原因 從節(jié)約材料出發(fā) 搭邊值愈小愈好 但搭邊值小于一定數(shù)值后 對模具壽命和剪切表面質(zhì)量不利 在沖裁中有可能被拉人模 具問隙中 使零件產(chǎn)生毛刺 甚至損壞模具刃口 降低模具壽命 因此 在考慮提高材 料利用率的同時(shí) 必須根據(jù)零件產(chǎn)量 質(zhì)量和壽命 確定排樣方法和搭邊值 2 凹模結(jié)構(gòu)的影響對容易產(chǎn)生應(yīng)力集中而開裂的凹模結(jié)構(gòu) 可以采用組合結(jié)構(gòu)或鑲 拼結(jié)構(gòu) 以及預(yù)應(yīng)力結(jié)構(gòu) 從而提高模具使用壽命 3 間隙的影響當(dāng)間隙過小時(shí) 壓縮擠壓利害 摩擦力增大 磨損增大 側(cè)面的磨損 加劇 沖裁后卸料和推件時(shí) 材料與凸 凹模之間的摩擦還將造成刃口側(cè)面的磨損比端 面的磨大大 同時(shí)也容易造成凸 凹模溫度很高 把金屬碎屑吸附在刃口側(cè)面 形成金 屬瘤 使凸 凹模出現(xiàn)崩刃或脹裂現(xiàn)象 因此 過小的間隙對模具壽命極為不利 間隙 太大 會增加凸模與凹模端面邊緣的集中應(yīng)力 致使壓應(yīng)力急劇增加 于是刃口邊很快 屈服變形而失去棱角 因此又增加了沖裁力 進(jìn)而使刃口邊更快磨損 降低模具壽命 但為了減小凸 凹模的磨損 延長模具使用壽命 在保證沖裁件質(zhì)量的前提下 設(shè)計(jì)時(shí) 適當(dāng)采用較大間隙是十分必要的 4 模具導(dǎo)向結(jié)構(gòu)對壽命的影響可靠的導(dǎo)向?qū)τ跍p小工作零件的磨損 避免凸 凹模 啃傷是非常有效的 特別對無問隙或小問隙沖裁模 復(fù)合模和多工位級進(jìn)模更為重要 為提高模具壽命 必須根據(jù)工序和零件精度要求 正確選擇導(dǎo)向形式和導(dǎo)向精度 所選 擇導(dǎo)向精度應(yīng)高于凸 凹模的配合精度 5 冷沖壓材料選取的影響冷沖壓材料應(yīng)滿足制件的設(shè)計(jì)要求和沖壓工藝要求 否則 容易損傷模具 降低模具使用壽命 冷沖壓材料表面質(zhì)量不好 沖壓時(shí)制件易破裂 也 易擦傷模具 冷沖壓材料塑性不好 變形量小 沖壓時(shí)制件易破裂 也易擦傷模具 另 外 材料的厚度公差應(yīng)符合國家標(biāo)準(zhǔn) 因?yàn)橐桓睕_模適用于一定材料的厚度 成形 彎 曲 翻邊 引伸模具的凸 凹模結(jié)構(gòu)間隙是直接根據(jù)材料厚度來確定的 所以材料厚度 不均勻 會導(dǎo)致廢品產(chǎn)生和模具損壞 2 模具材料對模具壽命的影響 模具材料對模具壽命的影響是模具材料性質(zhì) 化學(xué)成分 組織結(jié)構(gòu) 硬度和冶金質(zhì) 量等的綜合反映 其中 材料性質(zhì)和熱處理質(zhì)量影響最為明顯 模具材料性質(zhì)對模具壽 命的影響是很大的 如將同一種工件 使用不同的模具材料做彎曲試驗(yàn) 試驗(yàn)結(jié)果 用 9Mn2V 材料 其壽命為 5 萬次 用 Crl2MoV 滲氮 其壽命可達(dá) 40 萬次 因此 在選用材 料時(shí) 應(yīng)根據(jù)制件的批量大小 合理選用模具材料 模具工作零件的硬度對模具壽命的 影響也很大 但并不是硬度愈高 模具壽命愈長 這是因?yàn)橛捕扰c強(qiáng)度 韌性及耐磨性 等有密切的關(guān)系 有的沖模要求硬度高 壽命長 如采用 T10 鋼制造沖模 硬度為 54 58HRC 只沖幾千次 制件毛刺就很大 如果將硬度提高到 60 64HRC 則刃磨壽命 可達(dá) 2 3 萬次 但如果繼續(xù)提高硬度 則會出現(xiàn)早期斷裂 有的沖模硬度不宜過高 如 采用 Crl2MoV 制造凹模硬度為 58 62HRC 時(shí) 一般壽命為 2 3 萬件 失效形式是崩刃和 開裂以及如果將硬度降到 54 58HRC 壽命提高到 5 6 萬件 但硬度降低到 50 53HRC 會出現(xiàn)凹模刃口易磨鈍現(xiàn)象 由此可見 模具硬度必須根據(jù)材料性質(zhì)和失效形式而定 應(yīng)使硬度 強(qiáng)度 韌性及耐磨性 耐疲勞強(qiáng)度等達(dá)到特定沖壓工序所需要的最佳配合 3 模具的熱處理質(zhì)量與表面強(qiáng)化對壽命的影響 模具的熱處理質(zhì)量對模具的性質(zhì)與使用壽命影響很大 實(shí)踐證明 模具工作零件的 淬火變形與開裂 使用過程中早期斷裂 雖然與材料的冶金質(zhì)量 鍛造質(zhì)量 模具結(jié)構(gòu) 及加工有關(guān) 但與模具的熱處理關(guān)系更大 根據(jù)模具失效原因的分析統(tǒng)計(jì) 熱處理不當(dāng) 引起的失效占 50 以上 實(shí)踐證明 高級的模具材料必須配以正確的熱處理工藝 才能 真正發(fā)揮材料的潛力 模具工作零件表面強(qiáng)化處理的目的 是獲得外硬內(nèi)韌的效果 從 而得到硬度 耐磨性 韌性 耐疲勞強(qiáng)度的良好配合 模具表面強(qiáng)化處理方法很多 表 面處理的新技術(shù)工藝發(fā)展很快 除氮碳共滲和離子氮化 滲硼 滲鈮 滲釩 表面鍍硬 鉻和電火花強(qiáng)化外 化學(xué)氣相沉積 CVD 和物理氣相沉積 PVD 已逐步采用 經(jīng) CVD 和 PVD 處理后 模具表面覆蓋一層超硬物質(zhì) 如 TiC TiN 等 硬度極高 耐磨性 耐蝕性 抗 黏合性很好 可提高模具壽命幾倍到幾十倍 4 沖模零件的制造精度對模具壽命的影響 沖模制造的精度與使用壽命關(guān)系很大 特別是模具表面粗糙度對模具影響很大 如 用 Crl2MoV 鋼制造落料模 如果表面粗糙度值 R 1 6 m 時(shí) 其壽命為 3 萬件左右 如 經(jīng)精拋光 表面粗糙度值 R 0 4 m 壽命可提高到 4 5 萬件 因此 對模具工作零件 表面 一般都要經(jīng)過磨削 研磨 拋光等精加工和精細(xì)加工 5 其他方面對模具壽命的影響 1 壓力機(jī)的精度不高 也易使沖模損壞 2 沖模在壓力機(jī)上安裝的正確與否及操作者的技術(shù)水平高低 對模具壽命也有很大 影響 3 沖模的保管和維護(hù)好壞 以及使用潤滑劑的情況 也影響模具使用壽命 6 結(jié)語 在實(shí)際生產(chǎn)中 對于薄板沖模使用 很少出現(xiàn)非正常磨損的情況 但對于厚板沖模 時(shí)則發(fā)現(xiàn)易出現(xiàn)非正常磨損 我們總是針對出現(xiàn)的問題進(jìn)行研究總結(jié) 因?yàn)橐桓崩錄_模 從設(shè)計(jì) 加工制造 裝配 調(diào)試到安裝 使用 都耗費(fèi)了眾多工時(shí) 同時(shí)沖模的凸 凹 模使用的材料 大都是優(yōu)質(zhì)合金鋼 因此 沖模的成本都是比較高的 所以在生產(chǎn)中了 解影響沖模壽命的因素及采取相應(yīng)的對策來指導(dǎo)生產(chǎn) 具有重大的現(xiàn)實(shí)意義 Die Life of cold stamping die and mprovements Overview of stamping die Stamping Die Stamping in the cold the material metal or non metallic processing into parts or half of a special technical equipment called cold stamping die commonly known as Die Press is at room temperature using the die installed in the press to put pressure on the material to produce a separation or plastic deformation and thus to obtain the necessary parts of a pressure processing method Stamping die in the form of many the general categories according to the following main features 1 According to the technical nature of 1 Die along the closed or open contour the material are derived from mold If blanking die punch die cut off the mold cut mode cutting mode split mode etc 2 bending mode to blank or blank sheet along a straight line curved line to bend deform and thus obtain a certain angle and shape of the workpiece in the mold 3 The drawing die is made of the blank sheet opening hollow or hollow pieces of further changes to the shape and size of the mold 4 Die rough or semi finished workpiece is convex according to plan direct copy the shape of the die shape the material itself generate only local plastic deformation of the mold Such as the bulging mode reducing the die expansion die forming die rolling flanging mold plastic mold 2 According to the degree classification process combination 1 single process model in a press tour just completed a die stamping process 2 composite model is only one station in a press tour at the same station at the same time to complete more than two or two die stamping process 3 Progressive Die also known as the modulus of continuity in the feeding direction rough with two or more of the station at the press of a visit work in different places on the completion of two or two successive Road over stamping die process Chong called cold stamping die Die wide Cold stamping die is used in cold stamping die mold industry and accessories required for high performance structural ceramic materials preparation methods high performance ceramic materials molds and accessories from the zirconium oxide and yttrium aluminum powder increases Pr element composition Preparation is the solution of zirconia yttria solution praseodymium oxide solution according to a certain percentage of alumina solution when mixed liquor ammonium bicarbonate infusion by co precipitation synthesis of ceramic materials molds and accessories needed for raw materials reaction precipitate generated by the treatment drying calcining and accessories by high performance ceramic mold material superfine powder and then after forming sintering finishing they will have high performance ceramic materials molds and accessories Advantages of this invention is the invention made of cold stamping dies and parts and long service life the process does not appear in the press and its parts and stamping die bond generated the phenomenon of stamping surface is smooth no glitches can replace traditional high speed steel tungsten steel Die with the main parts Die stamping tools is the main process equipment stamping rely on the relative movement under the mold completed Processing time because the upper and lower mold between the constant division and if continued operation of the fingers of workers to enter or remain in the mold closed there will certainly pose a serious threat to their personal safety A of the mold main parts function and safety requirements 1 Working parts is a direct punch to blank forming the working parts therefore it is the key to mold parts Punch not only sophisticated and complex it should meet the following requirements 1 be of sufficient strength can not be broken or destroyed during stamping 2 should be appropriate to its material and heat treatment requirements to prevent too high hardness and brittle fracture 2 Positioning parts positioning part is to determine the location of the parts installed blank there are pins board gauge pin plate lead is sold guide plate knife set from the side side pressure etc Design should be considered when positioning parts easy to operate and should not have had orientation location to facilitate observation preferably in the forward position contouring to correct the pin location and positioning 3 Binder unloading and discharging parts binder components are blank holder binder board Blank holder pressure can drawing blank holder force thereby preventing billets under the action of the tangential pressure arch formed folds The role of pressure plate to prevent movement and bounce blank Top of the device discharge board s role is to facilitate the pieces and clean up waste Them by the spring rubber and equipment putting on the air cushion support can move up and down knocking out pieces of the design should have enough top output movement to the limited spaces Stripper plate area should be minimized or closed position in the operating groove milling out empty handed Exposure of the stripper plate should have protection around the plate to prevent finger inserted into or foreign objects inside exposed surface edges should be blunt down 4 Guide parts and guide sleeve guide pin is the most widely used part of a guide Its role is to ensure punch the punching clearance when accurate match Therefore the guide posts guide cover the gap should be less than the blanking clearance Guide Post located next mold base to ensure that the stroke bottom dead center the lead column in the template on the face over the top for at least 5 to 10 mm Guide columns should be arranged far away from the module and the pressure plate in the area so the operator s arms do not get to take over the lead column material 5 Supporting and clamping the upper and lower parts which includes templates die handle fixed plate punch plate stopper etc Up and down the template is the basis of the cold die parts other parts are respectively fixed at the top Template plane size especially around the direction to be compatible with the workpiece too large or too small are not conducive to action Some molds blanking punching type mold to the pieces of convenience be set up under the mold plate At this time the best and the template plate connected between the screw the two plate thickness should be absolutely equal Plate spacing out the pieces to be able to prevail not too much so as not to break the template 6 Fastening parts which includes screws nuts springs pins washers etc are generally used standard parts Die more with the amount of standard parts design choice and flexibility should be tightened to ensure the top out of the need to avoid exposure to the surface fastener operating position the staff and impede operation to prevent bumps Die with the development of Since reform and opening with the rapid development of the national economy the market demand with the growing Die In recent years Die with the industry has been around 15 growth rate of the rapid development of industrial enterprises with ownership Die components also changed dramatically in addition to the professional mold factory outside of state owned collective joint ventures wholly owned and private has been a rapid development As with the accelerating pace of international integration the increasing competition in the market it has been increasingly recognized product quality cost and new product development capacities The cold die manufacturing is the most basic elements of the chain one of the cold die manufacturing technology to measure a country s manufacturing sector has become an important symbol of the level and largely determine the viability of enterprises Die with enterprises to increase in recent years many technological advances for investment technological progress will be seen as an important driving force for enterprise development Some domestic enterprises have popularized the two dimensional mold CAD and gradually began to use UG Pro Engineer I DEAS Euclid IS and other international common software individual manufacturers have also introduced Moldflow C Flow DYNAFORM Optris and MAGMASOFT etc CAE software and successfully applied in stamping die design A car cover mold as the representative of a large stamping die manufacturing technology has made great progress Dongfeng Motor Corporation mold factory mold manufacturers such as FAW mold center has been able to produce some car cover mold In addition many research institutions and universities to carry out technology research and development of mold After years of effort in the mold CAD CAE CAM technology has made remarkable progress in improving quality and reducing mold die design and manufacturing cycle and so contributed Although China Die with the industry over the past decade has made remarkable development but in many ways compared with the industrialized countries there is still a large gap For example the precision machining equipment processing equipment in Die with the relatively low proportion CAD CAE CAM technology penetration is not high many advanced mold technology not widely so resulting in a considerable number of large sophisticated complex and long Die life with dependence on imports With the continuous progress of science and technology modern industrial production of increasingly complex and diverse product performance and quality is ever increasing thus the cold stamping technology put forward higher requirements In order to adapt to the cold stamping technology industry needs cold stamping technology itself also in innovation and development cold stamping technology idea is to improve and expand as much as possible the advantages of the cold stamping process to overcome its shortcomings in the cold stamping technology development should note the following aspects 1 cold stamping technology process parameters should be properly identified and Die with the work of some of the shape and size to improve the quality of stamping parts and shorten the new product production cycle should be in strengthening the metal forming the basis of theoretical studies to metal forming theory to practice can produce a direction and gradually establish a close connection with the actual production of the advanced process of calculation abroad have begun to use plastic finite element method automobile parts forming process of the stress and strain analysis and computer simulation to predict the forming part of a process plan on the possibilities and potential problems 2 to accelerate product replacement mold design to overcome the shortcomings of a long cycle Should vigorously carry out computer aided design and manufacture of molds CAD CAM Research In my country paying particular attention to strengthening the multi position progressive die CAD CAM Technology 3 to meet the needs of mass production and reduce labor intensity Should strengthen cold stamping of mechanized and automated so that the average small pieces of high speed presses in a multi position progressive die production production reached a high degree of automation to further improve stamping productivity 4 expand the scope of application of cold stamping production So cold pressing both suitable for mass production but also for small batch production both the general accuracy of product production but also can produce precision parts Should pay attention to development such as fine blanking especially thick material fine blanking forming high energy soft mold forming pressure and processing new superplastic forming process but also promote the easy mode soft mode and the low melting point alloy mold Universal Hybrid model the use of CNC punch press and other equipment In addition the performance improvement of sheet metal stamping mold new material die development of new processing methods should be further strengthened Die with life and Countermeasures Die with the life of the workpiece by punching out the number of terms Many factors affect the life Die There are die structure design manufacture molds used in the punch and die materials die quality and surface hardening heat treatment precision die manufacturing parts and cold stamping materials selection In addition there are die installation adjustment use and maintenance 1 Die Design on Life 1 Layout design of layout methods and take the boundary value a great impact on the die life too small to take the boundary value often causing rapid wear and convex mold die bite wounds on the Starting from material savings take the boundary value smaller the better but take the edge is less than some value the cut surface of the mold and the quality of life adversely There will be left behind in the blanking die Q gap were to produce spare parts glitch or even damage the die edge reduce die life Therefore consider increasing the material utilization of the same time parts must yield quality and life expectancy to determine the layout methods and take the boundary 2 die structure prone to stress concentration on the cracking of the die structure composite structure can be used or mosaic structure and prestressed structure to enhance the mold life 3 the impact of clearance when the gap is too small compressed extrusion of interest increased friction increased wear the wear side of aggravated discharge and push pieces after blanking time materials and convex the friction between die will cause wear and tear than the end edge on the side of the grinding much but also easily lead to convex concave mold temperature is high the adsorption of metal debris in the side edge to form a metal tumor so that male and female die chipping or expansion occurs crack phenomenon Therefore the gap is too small to Die Life very bad Gap is too large will increase the punch and the die face the edge of the concentration of stress resulting in a sharp increase in stress so blade edge quickly lose angular yield deformation Therefore addition of blanking force thereby enabling faster edge edge wear reduce die life But in order to reduce the male and female die wear extending mold life while ensuring quality of stamping pieces under the premise that larger space designed properly it is necessary 4 Die oriented structure of the lif