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表(1) 機(jī)械加工工藝過(guò)程
(模具專(zhuān)業(yè)沖壓模具課題適用)
機(jī)械加工工藝過(guò)程卡片
產(chǎn)品型號(hào)
001
零(部)件圖號(hào)
產(chǎn)品名稱(chēng)
拉深翻邊復(fù)合模
零(部)件名稱(chēng)
拉深凸模
共(1)頁(yè)第(1)頁(yè)
材料牌號(hào)
T10A
毛坯
種類(lèi)
鑄件
毛坯外型尺寸
¢205×90㎜
每個(gè)毛坯可制件數(shù)
1
每臺(tái)
件數(shù)
1
備注
工序號(hào)
工序名稱(chēng)
工 序 內(nèi) 容
車(chē)間
工段
設(shè)備
工 藝 裝 備
工時(shí)
準(zhǔn)終
單件
0
下料
¢125×90㎜
一車(chē)間
鋸床
10
粗車(chē)
粗車(chē)凸模外圓端面至¢203㎜高度90mm
¢182mm高度70mm
¢122mm高度18mm
二車(chē)間
中心車(chē)床
專(zhuān)用車(chē)夾具
20
粗鏜
粗鏜內(nèi)孔至¢63㎜高度90mm從后端粗鏜內(nèi)孔¢83mm高度65mm
二車(chē)間
中心車(chē)床
專(zhuān)用鏜夾具
30
精車(chē)
精車(chē)凸模外圓端面至¢200㎜¢180mm¢121mm
二車(chē)間
中心車(chē)床
專(zhuān)用車(chē)夾具
40
精鏜
精鏜凹模內(nèi)孔至¢60㎜¢80mm
二車(chē)間
中心車(chē)床
專(zhuān)用鏜夾具
50
研磨
研磨凸模外圓端面和內(nèi)孔至圖紙要求尺寸
三車(chē)間
手工研磨
銼刀
60
銑
精銑上下兩端面至所需厚度
三車(chē)間
組合機(jī)床
專(zhuān)用銑夾具
設(shè)計(jì)日期
審核日期
標(biāo)準(zhǔn)化日期
會(huì)簽
日期
標(biāo)記
記數(shù)
更改文
件號(hào)
簽字
日期
標(biāo)記
處數(shù)
更該文件號(hào)
表(2) 機(jī)械加工工藝過(guò)程卡
(模具專(zhuān)業(yè)沖壓模具課題適用)
機(jī)械加工工藝過(guò)程卡片
產(chǎn)品型號(hào)
零(部)件圖號(hào)
產(chǎn)品名稱(chēng)
拉深翻邊復(fù)合模
零(部)件名稱(chēng)
拉深翻邊凹模
共(1)頁(yè)第(1)頁(yè)
材料牌號(hào)
T10A
毛坯
種類(lèi)
鑄件
毛坯外型尺寸
¢350×100(mm)
每個(gè)毛坯可制件數(shù)
1
每臺(tái)
件數(shù)
1
備注
工序號(hào)
工序名稱(chēng)
工 序 內(nèi) 容
車(chē)間
工段
設(shè)備
工 藝 裝 備
工時(shí)
準(zhǔn)終
單件
0
下料
345×252×95(mm)
一車(chē)間
鋸床
專(zhuān)用鋸?qiáng)A具
10
鉆
鉆擴(kuò)凹模孔至¢10㎜,孔口倒角1×45 °
二車(chē)間
Z3025
專(zhuān)用鉆夾具
20
鏜
粗鏜凹模孔至¢126㎜和¢65mm
二車(chē)間
組合機(jī)床
專(zhuān)用鏜夾具
30
粗車(chē)
粗車(chē)凹模外緣尺寸至¢185㎜高度55mm
二車(chē)間
中心車(chē)床
專(zhuān)用車(chē)夾具
40
精鏜
精鏜凹??字痢?26.14㎜和65.575
二車(chē)間
組合機(jī)床
專(zhuān)用鏜夾具
50
精車(chē)
精車(chē)凸凹模外緣尺寸至180㎜高度52mm
二車(chē)間
中心車(chē)床
專(zhuān)用車(chē)夾具
60
銑
銑凹模上下端面至圖紙所要求的尺寸
三車(chē)間
組合機(jī)床
專(zhuān)用銑夾具
70
研磨
研磨凹模內(nèi)孔和外緣刃口至圖紙要求尺寸
三車(chē)間
手工
設(shè)
計(jì)
日期
審核日期
標(biāo)準(zhǔn)化日期
會(huì)簽
日期
標(biāo)記
記數(shù)
更改文
件號(hào)
簽字
日期
標(biāo)記
處數(shù)
更該文件號(hào)
表(3) 機(jī)械加工工藝過(guò)程卡
(模具專(zhuān)業(yè)沖壓模具課題適用)
機(jī)械加工工藝過(guò)程卡片
產(chǎn)品型號(hào)
零(部)件圖號(hào)
產(chǎn)品名稱(chēng)
拉深翻邊復(fù)合模
零(部)件名稱(chēng)
翻邊凸模
共(1)頁(yè)第(1)頁(yè)
材料牌號(hào)
T10A
毛坯
種類(lèi)
鑄件
毛坯外型尺寸
¢160×150㎜
每個(gè)毛坯可制件數(shù)
1
每臺(tái)
件數(shù)
1
備注
工序號(hào)
工序名稱(chēng)
工 序 內(nèi) 容
車(chē)間
工段
設(shè)備
工 藝 裝 備
工時(shí)
準(zhǔn)終
單件
0
下料
155mm×125mm×145mm
一車(chē)間
鋸床
專(zhuān)用鋸?qiáng)A具
10
鉆
鉆出氣孔¢5㎜
二車(chē)間
Z3025
專(zhuān)用鉆夾具
20
粗車(chē)
粗車(chē)外緣尺寸至¢151㎜高度145¢80mm高度110¢63mm高度43mm
二車(chē)間
中心車(chē)床
專(zhuān)用車(chē)夾具
30
精車(chē)
精車(chē)外緣尺寸至¢150㎜¢78¢62
二車(chē)間
中心車(chē)床
專(zhuān)用車(chē)夾具
40
磨
修磨凸模外緣尺寸和上下端面尺寸,達(dá)到圖紙要求
三車(chē)間
磨床
專(zhuān)用磨夾具
50
鉆
鉆M=10㎜螺紋底孔,孔口倒角1×45 °
二車(chē)間
Z3025
專(zhuān)用鉆夾具
60
攻
攻螺紋M=12㎜
三車(chē)間
Z3025
專(zhuān)攻螺紋夾具
設(shè)計(jì)日期
審核日期
標(biāo)準(zhǔn)化日期
會(huì)簽
日期
標(biāo)記
記數(shù)
更改文
件號(hào)
簽字
日期
標(biāo)記
處數(shù)
更該文件號(hào)
河南機(jī)電高等專(zhuān)科學(xué)校
畢業(yè)設(shè)計(jì)開(kāi)題報(bào)告
學(xué)生姓名: 學(xué) 號(hào)
專(zhuān) 業(yè):
設(shè)計(jì)題目: 鏈輪的沖壓工藝及模具設(shè)計(jì)
指導(dǎo)教師:
2006 年 4月 3日
畢 業(yè) 設(shè) 計(jì)(論 文)開(kāi) 題 報(bào) 告
文 獻(xiàn) 綜 述
一.模具行業(yè)發(fā)展現(xiàn)狀
(一)國(guó)內(nèi)模具發(fā)展?fàn)顩r
改革開(kāi)放以來(lái),隨著國(guó)民經(jīng)濟(jì)的高速發(fā)展,市場(chǎng)對(duì)模具的需求量不斷增長(zhǎng)。近年來(lái),模具工業(yè)一直以15%左右的增長(zhǎng)速度快速發(fā)展,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(guó)有專(zhuān)業(yè)模具廠外,集體、合資、獨(dú)資和私營(yíng)也得到了快速發(fā)展。浙江寧波和黃巖地區(qū)的“模具之鄉(xiāng)”;廣東一些大集團(tuán)公司和迅速崛起的鄉(xiāng)鎮(zhèn)企業(yè),科龍、美的、康佳等集團(tuán)紛紛建立了自己的模具制造中心;中外合資和外商獨(dú)資的模具企業(yè)現(xiàn)已有幾千家。
在中國(guó),人們已經(jīng)越來(lái)越認(rèn)識(shí)到模具在制造中的重要基礎(chǔ)地位,認(rèn)識(shí)到模具技術(shù)水平的高低,已成為衡量一個(gè)國(guó)家制造業(yè)水平高低的重要標(biāo)志,并在很大程度上決定著產(chǎn)品質(zhì)量、效益和新產(chǎn)品的開(kāi)發(fā)能力。 許多模具企業(yè)十分重視技術(shù)發(fā)展,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?jiǎng)恿?。此外,許多研究機(jī)構(gòu)和大專(zhuān)院校開(kāi)展模具技術(shù)的研究和開(kāi)發(fā)。經(jīng)過(guò)多年的努力,在模具CAD/CAE/CAM技術(shù)、模具的電加工和數(shù)控加工技術(shù)、快速成型與快速制模技術(shù)、新型模具材料等方面取得了顯著進(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)。
中國(guó)模具工業(yè)在過(guò)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(guó)家相比仍有較大的差距。例如,精密加工設(shè)備在模具加工設(shè)備中的比重還比較低,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)用還不夠廣泛等等。特別在大型、精密、復(fù)雜和長(zhǎng)壽命模具技術(shù)上存在明顯差距,這些類(lèi)型模具的生產(chǎn)能力也不能滿(mǎn)足國(guó)內(nèi)需求,因而需要大量從國(guó)外進(jìn)口
(二)國(guó)外模具發(fā)展?fàn)顩r
模具制造技術(shù)現(xiàn)代化是模具工業(yè)發(fā)展的基礎(chǔ)。隨著科學(xué)技術(shù)的發(fā)展,計(jì)算機(jī)技術(shù),信息技術(shù),自動(dòng)化技術(shù)等先進(jìn)技術(shù)不斷向傳統(tǒng)制造技術(shù)滲透,交叉,融合,對(duì)其實(shí)施改造,形成先進(jìn)制造技術(shù)。國(guó)外經(jīng)過(guò)幾十年的現(xiàn)代化改造,無(wú)論在工業(yè)裝備上,模具設(shè)計(jì)和制造上,生產(chǎn)工藝和技術(shù)上,還是在產(chǎn)品品種規(guī)格、生產(chǎn)規(guī)模和質(zhì)量等方面都得到了飛速發(fā)展,尤其是美國(guó)、俄國(guó)、德國(guó)、日本、法國(guó)、意大利、捷克、奧地利、瑞士等國(guó)的模具生產(chǎn)的發(fā)展水平達(dá)到了相當(dāng)高的程度。國(guó)外近年來(lái)發(fā)展的高速銑削加工,大幅度提高了加工效率,并可獲得極高的表面光潔度。另外,還可加工高硬度模塊,還具有溫升低、熱變形小等優(yōu)點(diǎn)。高速銑削加工技術(shù)的發(fā)展,對(duì)汽車(chē)、家電行業(yè)中大型型腔模具制造注入了新的活力。目前它已向更高的敏捷化、智能化、集成化方向發(fā)展。世界鋼鐵的生產(chǎn)尚不能滿(mǎn)足交通運(yùn)輸輕量化對(duì)沖壓件的需求,有必要新建若干條現(xiàn)代化大、中型沖壓生產(chǎn)線。
二、未來(lái)沖壓模具制造技術(shù)發(fā)展趨勢(shì)
模具技術(shù)的發(fā)展應(yīng)該為適應(yīng)模具產(chǎn)品“交貨期短”、“精度高”、“質(zhì)量好”、“價(jià)格低”的要求服務(wù)。達(dá)到這一要求急需發(fā)展如下幾項(xiàng):
(1)全面推廣CAD/CAM/CAE技術(shù);
(2)高速銑削加工;
(3)模具掃描及數(shù)字化系統(tǒng);
(4)電火花銑削加工;
(5)提高模具標(biāo)準(zhǔn)化程度;
(6)優(yōu)質(zhì)材料及先進(jìn)表面處理技術(shù);
(7)模具研磨拋光將自動(dòng)化、智能化;
(8)模具自動(dòng)加工系統(tǒng)的發(fā)展。
三.研究本課題所受的啟發(fā)啟發(fā)
在設(shè)計(jì)過(guò)程中遇到了種種專(zhuān)業(yè)知識(shí)的困難,也正好從設(shè)計(jì)去復(fù)習(xí),鞏固和彌補(bǔ)自己在專(zhuān)業(yè)課上所犯的錯(cuò)誤。在冷沖模具方面的橫向發(fā)展,牽扯到了一門(mén)門(mén)專(zhuān)業(yè)課程的連接。做一次冷沖模具畢業(yè)設(shè)計(jì),加大了我對(duì)知識(shí)的渴求,進(jìn)一步證明了自己還有許多的知識(shí)還沒(méi)學(xué)到家,需要加倍努力去掌握書(shū)本上的專(zhuān)業(yè)知識(shí)和到生產(chǎn)實(shí)踐中去感受。模具設(shè)計(jì)的奧妙在于自己耐心的細(xì)心探討,在于自己深入地研究。設(shè)計(jì)文獻(xiàn)有:
【1】中國(guó)機(jī)械工程學(xué)會(huì)
中國(guó)模具設(shè)計(jì)大典編委會(huì). 中國(guó)模具設(shè)計(jì)大典(3). 江西科學(xué)技出版社.
2003
【2】鐘毓斌主編. 沖壓工藝與模具制造. 機(jī)械工業(yè)出版社.
2000.
【3】馮炳堯主編. 模具設(shè)計(jì)與制造簡(jiǎn)明手冊(cè). 上海科學(xué)技術(shù)出版社.
1999
【4】許發(fā)樾主編. 模具標(biāo)準(zhǔn)應(yīng)用手冊(cè) 機(jī)械工業(yè)出版社
1997
【5】劉建超、張寶忠主編 沖壓模具設(shè)計(jì)與制造 高等教育出版社
2002
【6】陳孝康主編 實(shí)用模具技術(shù)手冊(cè) 中國(guó)輕工業(yè)出版社
2001
【7】陳錫棟主編 實(shí)用模具技術(shù)手冊(cè) 機(jī)械工業(yè)出版社
2001
【8】模具實(shí)用技術(shù)叢書(shū)編委會(huì) 沖模設(shè)計(jì)應(yīng)用實(shí)例 機(jī)械工業(yè)出版社
2000
【9】王孝培主編 沖壓手冊(cè) 機(jī)械工業(yè)出版社
1990
【10】ASTME Die Desing Handbook MCGNA whill
1965
畢 業(yè) 設(shè) 計(jì)(論 文)開(kāi) 題 報(bào) 告
本課題的研究思路(包括要研究或解決的問(wèn)題和擬采用的研究方法、手段(途徑)及進(jìn)度安排等):
(1)零件工藝性分析……………………………………………2天
(2)模具主要設(shè)計(jì)計(jì)算…………………………………………10天
(3)模具總體設(shè)計(jì)………………………………………………3天
(4)模具主要零部件設(shè)計(jì)………………………………………14天
(5)模具裝配圖的確定及工作原理……………………………5天
(6)沖裁成型工藝質(zhì)量問(wèn)題及解決措施………………………7天
(7)電子文檔的制作……………………………………………7天
(8)模具裝配圖及零件圖的繪制………………………………14天
(9)其他…………………………………………………………10天
畢 業(yè) 設(shè) 計(jì)(論 文)開(kāi) 題 報(bào) 告
指導(dǎo)教師意見(jiàn):
1.對(duì)“文獻(xiàn)綜述”的評(píng)語(yǔ):
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插圖清單
插圖清單
圖(01)工件圖……………………………………………………………6
圖(02)毛坯圖……………………………………………………………8
圖(03)翻邊前毛坯示意圖………………………………………………9
圖(04)模具總裝示意圖…………………………………………………13
圖(05)拉深凸模…………………………………………………………16
圖(06)拉深(翻邊)凹?!?6
圖(07)翻邊凸模…………………………………………………………17
圖(08)后側(cè)導(dǎo)柱模架……………………………………………………18
圖(09)內(nèi)六角螺釘………………………………………………………20
圖(10)圓柱銷(xiāo)……………………………………………………………20
圖(11)聚氨酯彈性體……………………………………………………22
(畢業(yè)設(shè)計(jì)/論文題目)
摘要
通過(guò)對(duì)制件的工藝計(jì)算及拉深翻邊時(shí)的受力,應(yīng)力及金屬流動(dòng)狀態(tài)進(jìn)行分析,設(shè)計(jì)并改進(jìn)了反拉深模的結(jié)構(gòu),保證了零件尺寸的要求,消除了料厚變薄等缺陷,此模具結(jié)構(gòu)簡(jiǎn)單,實(shí)用性強(qiáng),提高勞動(dòng)生產(chǎn)率,為防止制件起皺和拉裂常通過(guò)改善材料力學(xué)性能和合理確定凹模圓角半徑,同時(shí)分析了該制件的工藝性。設(shè)計(jì)了拉深模具,并介紹了所用模具材料特點(diǎn)
關(guān)鍵詞 拉深模 設(shè)計(jì) 料厚變薄 改進(jìn)
(畢業(yè)設(shè)計(jì)/論文英文題目)
Abstract
Through the technological calculation of the product and the analysis of the exerted force ,stree and metal flowing status when drawing for ward and backward,the back ward drawing die was desingal and improved in its structure,which ensured the requirement of the part dimensions and eliminated some defects such as the material thickness becoming thinner,The structure of the die for the technological process is simple and practical,it can increase the production efficiency,in order to ensure the uniformity of the blanking clearance of the die ,inorganic adhesive is used to bord and fix the punch to eliminate manufacturing errors,after an analysis of the technological property of the producte,the dimensions of the blank were determined and the drawing die for the part was designeal the characteristics of the die material were introduced at last.
Key words backward drawing die design material thickness getting thinner improvement
i
外文資料與中文翻譯
外文資料:
Analysis on The Factors of Impacting on The Life of Stamping Die
REN Hai-dong.YU Ling
Abstract:Stamping is a wide range of material processing methods,stamping die is equipment to achieve the important parts of theprocessing,whose life directly afects quality an d cost ofthe product.This article analyzes to its influencing factors,finding a method tosolveproblems,andimprovethelifeof stamping die.
Keywords:Samping die;life;Infl uencing facto
Is the use of stamping presses installed in the die pressure on the material to produce plastic deformation or separation in order to obtain the parts needed for a pressure processing method. In industrial production, especially in household appliances, automotive, aerospace and engineering fields such as instrumentation is widely available. The die is the realization of this important technology components and equipment for processing. Die as a result of a long cycle of production and processing, the use of the high cost of materials, manufacturing costs in product cost of production occupies a significant proportion, therefore, to improve the life of stamping dies is very important. Through the use of molds, for various reasons can not be a reproduction of the red pieces of qualified, could no longer be repaired, which is commonly referred to as die failure. Die life by various forms of limitations expired, common are: wear failure, failure deformation, fracture failure and failure, such as bite wounds. Stamping processes, as well as due to different working conditions of the different effects of stamping die failure are many factors, but the same factors may also bring some form of failure. In this paper, an analysis of its influencing factors, possible solutions to the problem in order to achieve the purpose of die life.
1 Mold Design
Mold design, including structural design and parts design. The structure of mold not only affects the quality of parts produced to determine the productivity of enterprises and processing methods, but also to improve the life of mold also has a key role. Therefore, before designers to make full preparations to meet the production tooling to optimize the structure at the same time.
1.1 Parts of Product Design
Reasonable product design will help improve the life of mold. If the product has a cusp, or fillet radius is too small, the design of the edge will die due to stress concentration and cracking. Without prejudice to the structure and function of products, we can change the design of some of its unreasonable.
1.2 Die Structure Design
Reasonable structure can improve the die life. For example, in Die, the direction to improve the convex and concave stamping die in the course of the relative stability, thus ensuring the mold space at a reasonable framework of blanking blanking. And the reasonableness of blanking clearance and stability to improve die life is an important measure. Accurate reduced-oriented relationship between the relative movement of the wear and tear of parts and components to avoid the convex, concave die as a result of unreasonable gap a "bite injuries" and other forms of failure. Particularly in the Fine Blanking Die, the high-precision mold-oriented institutions is to ensure that the structural design of an important guarantee for success. Therefore in order to improve the life of mold, the form must be the right choice and guide precision-oriented. The choice of orientation should be higher than the accuracy of convex and concave mold with precision. For more blanking punch, punch in a number of large difference in diameter, there is a difference and close the case that if a small and a long punch, then easily lead to instability or break. We can punch arranged in Figure 1 (a) ladder-style in order to increase its stiffness. Punching holes for the need to increase the punch guide in order to enhance the strength of punch, which is to ensure the normal work of stamping dies to the premise. Which can increase many-oriented approach, to be used in Figure 1 (b) shown in the front and the entire process-oriented and other-oriented.
Figure 1 (a) ladder layout punch 1 (b) punch-oriented
Accurate calculation of the process can also increase mold life. Such as discharge power and the calculation of stroke. If we are not allowed to easily spring fatigue fracture or failure. Die on a high degree of calculation, as well as the choice of press and reasonable manner and location-oriented institutions can effectively improve the die life. Modulus of continuity for the design and layout of the ride side of the calculation of size is also crucial.
1.3 Die gap
Stamping dies when space is the convex, concave die size difference between the horizontal edge. Gap on the impact of a large die life is a stamping process and die design of an extremely important issue. Convex, concave die gap size of a direct impact on product quality and mold the life space is too large or too small will cause the edge passivation or wear and tear (as shown in Figure 2). Die materials drop to die later, punch to punch prevail, and these two dimensions has been the impact of space. The experimental results show that the thickness of the gap below 2 percent, prone punch damage, space for more than 6%, there had been errors in parts size. Gap in the thickness of 4% ~ 5%, the effect of blanking good stability. Die gap, therefore the correct choice is to ensure that an important way to die life. At present, the choice of space data in addition to investigations, the most by the actual experience.
(a) gap is too small (b) a reasonable gap (c) gap is too large
Figure 2 gap on the impact of stampings
2 Die Manufacturing
Mold manufacturing process design is reasonable, to ensure that mold is an important way of life. Most of mold manufacturing parts of the process can be carried out in accordance with the normal, but there are special requirements for spare parts or spare parts for local processing, will need to have some special methods.
2.1 Mechanical Rough
Material machining accuracy of the assembly of the mold affects accuracy, it will directly affect the mold of parallelism, perpendicularity and coaxiality. In addition, the marks left rough, worn, are prone to stress concentration sites, but also occurred in the early fatigue cracks and the local.
2.2 Heat Treatment
Heat Treatment in the manufacture of stamping die plays a very important role, in spite of different types and different structure of mold, the use of different steel products, or using different machining and processing of shape, but they need to use heat treatment process to obtain a higher hardness and wear resistance, as well as other mechanical properties required. In general, the die service life and quality of products produced to a large extent depends on the quality of heat treatment processing. Thus, in die manufacturing, and continuously improve the skill level of heat treatment, a reasonable template to improve the performance of internal organization and working methods, it is particularly important. Heat treatment time and temperature is an important factor, because of the time in different temperatures, heat treatment may constitute a different form, the main annealing, normalizing, quenching and tempering, and carburizing, nitriding, carbonitriding, etc.. For example, in the blanking die, because people punch wedge material is the work of more serious wear and tear parts, so the hardness should be greater in general for the HRC 60 ~ 63, die for the HRC 57 ~ 60, this kind of hardness than the two , or die punch hardness is higher than the longer die life.
3 Die Assembly and Debugging
Assembly is the key to mold production process. A direct impact on the quality of the die assembly of the quality of parts, dies and the life of the state of the technology. Die assembly includes two aspects:
(1) good parts of each machining process in accordance with requirements of drawings assembled into a general assembly and assembly;
(2) in the assembly process as part of the processing work. Die in the assembly as an example, the technical requirements is to ensure consistency blanking gap and ensure the accuracy of direction-oriented institutions, as well as the movement to ensure that all relevant pieces of die design in accordance with strict technical parameters. This is a debugging tool to ensure a successful and smooth conduct of the production protection, but also to ensure that an important factor in mold life. In recent years, with the development of the production, users are vulnerable to damage parts of the swap request, so that users die at the scene of the rapid replacement of damaged parts. Die before the test mode, it should also be designed in strict accordance with the technical parameters of the model to select press. It is closely related to the length of die life. Press the stiffness, precision, crucial parameters such as tonnage. Press one of the stiffness of stiffness by the bed, transmission stiffness and rigidity of three parts-oriented, if less stiffness, load and unloading end, the die gap, great changes will happen, it will affect the accuracy of stamping parts and mold life. Die after assembly, must be red and adjust the test can be used for production. In order to protect the mold, the first time in debugging, it is necessary to pay attention to the use of paper or aluminum, as well as cold-rolled plate red test. To ensure that edge punch die edge into the depth of the scope of a reasonable (usually for a material thickness). Stamping die so red when the level of stress and wear and tear will be minimal, and fully protect the convex and concave mold, increased die life. The purpose of debugging and the task is: to die out not only qualified stampings, security and stability but also put into production use. Should be based on examination of stamping defects, analysis of its causes and try to solve them. Some bending, deep drawing and flanging, etc. so that the deformation of sheet metal dies, stamping parts, when the shape of complex or high accuracy, it is difficult to accurately calculate the deformation of the former size and shape of the rough. For this type of stamping parts, although the relevant references are rough calculation methods and formulas, but the impact of plastic deformation as a result of many factors, calculated from the size and needs of different size. In the actual production in order to obtain more accurate size, often determined through experiments. Red in the test set to adjust the size of blank.
4 Conclusion
Stamping die life impact of a number of factors, from the above analysis we can see from the mold design to the use of the entire process can improve the die life. Practice has proved that the rational design of die structure and the shape of the die using the appropriate manufacturing processes, heat treatment process, so that die in the normal conditions, can increase the mold life.
References:
[1] Weng its gold. Cold stamping technology [M]. Beijing: Mechanical Industry Press, 2007.
[2] Liu, ZHANG Bao-zhong. Stamping die design and manufacture of [M]. Beijing: Higher Education Publishing
Agency. 2006.
[3]Xiaopei.wang. Stamping Manual [M]. Beijing: Mechanical Industry Press, 2006.
中文翻譯:
影響沖壓模具壽命的因素分析
任海東,于玲
摘要:沖壓成形是一種應(yīng)用廣泛的材料加工方法,沖壓模具是實(shí)現(xiàn)零件加工的重要工藝裝備,它的使用壽命直接影響到產(chǎn)品的質(zhì)量和成本。對(duì)模具壽命的影響因素加以分析,找出解決問(wèn)題的方法,從而達(dá)到提高模具壽命的目的。
關(guān)鍵詞:沖壓模具:壽命;影響因素
沖壓是利用安裝在壓力機(jī)上的沖模對(duì)材料施加壓力,使其產(chǎn)生分離或塑性變形,從而獲得所需要的零件的一種壓力加工方法。它在工業(yè)生產(chǎn)中,尤其是在家用電器、汽車(chē)、航空以及儀器儀表等工程領(lǐng)域獲得廣泛應(yīng)用。而沖模就是實(shí)現(xiàn)這一零件加工的重要工藝裝備。由于模具的生產(chǎn)加工周期長(zhǎng),使用的材料費(fèi)用高,制造成本在產(chǎn)品生產(chǎn)成本中占有相當(dāng)大的比例,因此,提高沖壓模具的壽命是非常重要的。模具經(jīng)過(guò)使用,由于種種原因不能再生產(chǎn)出合格的沖件,也不能再修復(fù),這種情況一般稱(chēng)為模具失效。模具壽命受各種失效形式的限制,常見(jiàn)的有:磨損失效、變形失效、斷裂失效及啃傷失效等。由于沖壓工序不同以及工作條件的不同,影響沖壓模具失效的因素很多,而同一種因素也可能帶來(lái)幾種失效形式。本文對(duì)其影響因素進(jìn)行分析,找出解決問(wèn)題的方法,從而達(dá)到提高模具壽命的目的。
1 模具設(shè)計(jì)
模具設(shè)計(jì)包括結(jié)構(gòu)設(shè)計(jì)和零部件設(shè)計(jì)。模具的結(jié)構(gòu)不僅能影響到所生產(chǎn)零件的質(zhì)量,決定企業(yè)的生產(chǎn)效率和加工方式,而且對(duì)提高模具的使用壽命也具有關(guān)鍵的作用。因此設(shè)計(jì)者在設(shè)計(jì)之前,要做好充分的準(zhǔn)備工作,在滿(mǎn)足生產(chǎn)的同時(shí)盡可能優(yōu)化模具結(jié)構(gòu)。
1.1 零件產(chǎn)品設(shè)計(jì)
合理的產(chǎn)品設(shè)計(jì)有利于提高模具的壽命。如果產(chǎn)品具有尖角,或圓角半徑太小,所設(shè)計(jì)的凹模刃口就會(huì)因應(yīng)力集中而開(kāi)裂。在不影響產(chǎn)品結(jié)構(gòu)和功能的前提下,我們可以改變其一些不合理的設(shè)計(jì)。
1.2 模具結(jié)構(gòu)設(shè)計(jì)
合理的結(jié)構(gòu)可以提高模具的壽命。例如在沖裁模中,導(dǎo)向機(jī)構(gòu)提高了凸、凹模在沖壓過(guò)程中的相對(duì)穩(wěn)定性,從而保證模具在合理的沖裁間隙范圍內(nèi)進(jìn)行沖裁。而沖裁間隙的合理性及穩(wěn)定性正是提高模具壽命的重要措施。精確的導(dǎo)向減少了有相對(duì)運(yùn)動(dòng)關(guān)系的零部件的磨損,避免了凸、凹模由于間隙不合理出現(xiàn)“啃傷”等失效形式。尤其在精密沖裁模中,高精度的
導(dǎo)向機(jī)構(gòu)是確保模具結(jié)構(gòu)設(shè)計(jì)成功的重要保障。因而為了提高模具的壽命,必須正確選擇導(dǎo)向形式和導(dǎo)向精度。導(dǎo)向精度的選擇應(yīng)高于凸、凹模的配合精度。對(duì)于多凸模沖裁,在幾個(gè)凸模直徑相差較大,相距又很近的情況下,如果小凸模細(xì)小而又較長(zhǎng),則容易造成失穩(wěn)或折斷。我們可以把凸模布置成如圖1(a)階梯式的,以增加其剛度。對(duì)于小孔沖裁,必須增加對(duì)凸模的導(dǎo)向,以提高凸模的強(qiáng)度,這是保證沖壓模具能正常工作的前提。其中能增加導(dǎo)向的方法很多,可采用如圖1(b)所示的前端導(dǎo)向和全程導(dǎo)向等。
準(zhǔn)確的工藝計(jì)算也可以提高模具的壽命。如卸料力及行程的計(jì)算。若計(jì)算不準(zhǔn),容易造成彈簧的疲勞斷裂或失效。對(duì)合模高度的計(jì)算以及壓力機(jī)的選擇,合理的定位方式及導(dǎo)向機(jī)構(gòu)等,都可以有效地提高模具的使用壽命。對(duì)于連續(xù)模排樣的設(shè)計(jì)和搭邊尺寸的計(jì)算也至關(guān)重要。
1.3 模具間隙
模具間隙是指沖壓時(shí)凸、凹模刃口橫向尺寸之差。間隙對(duì)模具壽命的影響很大,是沖壓工藝與模具設(shè)計(jì)中的一個(gè)極其重要的問(wèn)題。凸、凹模間隙的大小直接影響產(chǎn)品的質(zhì)量和模具的使用壽命,間隙過(guò)大或過(guò)小都會(huì)使刃口鈍化或磨損(如圖2所示)。沖裁模中落料一般以凹模為準(zhǔn),沖孔以凸模為準(zhǔn),而這兩個(gè)尺寸又受到間隙的影響。實(shí)驗(yàn)表明,間隙在板厚的2%以下時(shí),凸模容易發(fā)生損壞,間隙在6%以上時(shí),制件尺寸出現(xiàn)誤差。間隙在板厚4% ~5%時(shí),沖裁穩(wěn)定效果好。因此正確選擇模具間隙,是保證模具壽命的重要途徑。目前,間隙的選擇除了查資料以外,大部分靠實(shí)際經(jīng)驗(yàn)獲得。
2 模具制造
模具制造工藝設(shè)計(jì)的合理性,也是保證模具壽命的重要途徑。大部分模具零件的制造可以按正常的工藝進(jìn)行,但對(duì)有特別要求的零件或零件局部加工,就需要有一定特殊的方法。
2.1 機(jī)械粗加工
材料的加工精度對(duì)模具的裝配精度有很大的影響,將直接影響模具的平行度、垂直度和同軸度。另外,粗加工留下的刀痕、磨痕,都是容易產(chǎn)生應(yīng)力集中的部位,也是早期產(chǎn)生裂紋和發(fā)生疲勞的地方。
2.2 熱處理
熱處理在沖壓模具的制造中起著很重要的作用,盡管不同類(lèi)型及不同的結(jié)構(gòu)模具,使用不同的鋼材,或采用不同的機(jī)械加工及加工成形,但都需要用熱處理的加工方法,使其獲得較高的硬度和耐磨性,以及其他所要求的力學(xué)性能。一般來(lái)說(shuō),沖模的使用壽命及生產(chǎn)出來(lái)的產(chǎn)品質(zhì)量,在很大程度上取決于熱處理加工質(zhì)量.因此,在沖模制造中,不斷提高熱處理的技術(shù)水平,合理的改進(jìn)模板內(nèi)部組織和性能的工作方法,就顯得格外的重要。時(shí)間和溫度是熱處理的重要因素,由于時(shí)間溫度的不同,可構(gòu)成不同的熱處理形式,其主要有退火、正火、淬火、回火和滲碳、滲氮、碳氮共滲等。比如在沖裁模中,由于凸模楔人材料,是磨損比較嚴(yán)重的工作零件,所以其硬度應(yīng)大些,一般為HRC 60~63,凹模為HRC 57~60,這樣比兩者硬度樣,或凹模硬度高于凸模的模具壽命更長(zhǎng)一些。
3 模具裝配及調(diào)試
裝配是模具生產(chǎn)中的關(guān)鍵工序。沖模裝配質(zhì)量直接影響制件的質(zhì)量、沖模的技術(shù)狀態(tài)和使用壽命。沖模的裝配工作包括兩方面的內(nèi)容:
(1)將每個(gè)加工好的零件按圖紙工藝要求裝配成組合件及總體裝配;
(2)在裝配過(guò)程中進(jìn)行的一部分加工工作。以沖裁模的裝配為例,其技術(shù)要求是保證沖裁間隙一致性,保證導(dǎo)向機(jī)構(gòu)的導(dǎo)向精度,以及保證各相關(guān)運(yùn)動(dòng)件能夠按照模具設(shè)計(jì)的技術(shù)參數(shù)嚴(yán)格進(jìn)行。這是保證模具調(diào)試成功及生產(chǎn)能夠順利進(jìn)行的保障,也是確保模具壽命的重要因素。近年來(lái),隨著生產(chǎn)的發(fā)展,用戶(hù)對(duì)易損壞零件提出了互換要求,以便用戶(hù)在現(xiàn)場(chǎng)對(duì)模具損壞零件的迅速更換。模具在試模前,還應(yīng)該嚴(yán)格按照設(shè)計(jì)的技術(shù)參數(shù)來(lái)選擇壓力機(jī)的型號(hào)。它關(guān)系到模具使用壽命的長(zhǎng)短。壓力機(jī)的剛度、精度、噸位等參數(shù)至關(guān)重要。其中壓力機(jī)的剛度是由床身剛度、傳動(dòng)剛度和導(dǎo)向剛度三部分組成,如果剛度較差,負(fù)載終了和卸載時(shí),模具間隙會(huì)發(fā)生很大變化,將會(huì)影響到?jīng)_壓件的精度和模具壽命。模具裝配完后,必須經(jīng)過(guò)試沖和調(diào)整,才能進(jìn)行生產(chǎn)使用。為了保護(hù)模具,在第一次調(diào)試時(shí),要注意利用紙片或鋁片以及冷軋板進(jìn)行試沖。保證凸模刃口進(jìn)入到凹模刃口的深度在合理的范圍內(nèi)(一般為一個(gè)料厚)。這樣模具沖壓時(shí)的沖壓力及磨損程度會(huì)最小,充分保護(hù)了凸、凹模,提高了模具壽命。調(diào)試的目的和任務(wù)是:使沖模不僅能沖出合格的沖壓件,而且能安全穩(wěn)定的投入生產(chǎn)使用。應(yīng)根據(jù)試沖件中出現(xiàn)的缺陷,分析其產(chǎn)生的原因,設(shè)法加以解決。有些彎曲、拉深及翻邊等使板料變形的沖模,當(dāng)沖壓件的形狀復(fù)雜或精度較高時(shí),很難精確計(jì)算出變形前的毛坯尺寸和形狀。對(duì)于這一類(lèi)沖壓件,雖然相關(guān)參考資料都有計(jì)算毛坯的方法和公式,但由于影響塑性變形的因素非常多,計(jì)算出來(lái)的尺寸和實(shí)際的需要尺寸是有差別的。在實(shí)際的生產(chǎn)中為了得到較準(zhǔn)確的尺寸,往往通過(guò)試驗(yàn)來(lái)確定.即在試沖調(diào)整中確定毛坯的尺寸。
4 結(jié)論
影響沖壓模具壽命的因素很多,從以上分析可以看出從模具設(shè)計(jì)到使用的全過(guò)程中,均能提高模具壽命。實(shí)踐證明,合理設(shè)計(jì)模具結(jié)構(gòu)及形狀,采用恰當(dāng)?shù)臎_模制造工藝、熱處理工藝,使模具在正常的條件下工作,均能提高模具的壽命。
參考文獻(xiàn):
[1]翁其金.冷沖壓技術(shù)[M].北京:機(jī)械工業(yè)出版社,2007.
[2]劉建超,張寶忠.沖壓模具設(shè)計(jì)與制造[M].北京:高等教育出版
社。2006.
[3]王孝培.沖壓手冊(cè)[M].北京:機(jī)械工業(yè)出版社,2006.
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