2023年全國碩士研究生考試考研英語一試題真題(含答案詳解+作文范文)_第1頁
已閱讀1頁,還剩10頁未讀, 繼續(xù)免費閱讀

下載本文檔

版權(quán)說明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請進行舉報或認領

文檔簡介

1、<p>  Modern fast economy manufacture mold technology </p><p>  Along with the global economy development, the new technological revolution made the new progress and the breakthrough unceasingly, the

2、 technical leap development already becomes the important attribute which the impetus world economics grew. The market economy unceasing development, urges the industry product more and more to the multi- varieties, high

3、 grade, the low cost direction to develop, in order to maintain and strengthens the product in market competitive power, product development cycl</p><p>  1 fast prototypes manufactures technology The fast p

4、rototype manufacture technology is called RPM, is one kind of new manufacture technology which the 80's later period develops. US, Japan, England, Israel, Germany, China have all promoted own commercialization produc

5、t, and has formed the new industry gradually.RPM is the computer, the laser, the optical scanning, the advanced new material, the computer-aided design (CAD), the computer assistance processing (CAM), the numerical contr

6、ol (CNC) syn</p><p>  2 surfaces take shape the pattern making technology The surface takes shape the pattern making technology, mainly is the use spurts spreads, the electrolytic casting, chemistry corrosi

7、on and so on the new technique formation cavity surface and the fine pattern one kind of craft technology, in the practical application including following several kind of types. </p><p>  electric arcs sp

8、urt spread take shape the pattern making technology The electric arc spurts spreads takes shape the technical principle is: Has the electric arc quantity of heat using between 2 circular telegrams tinsel to melt the tin

9、sel, depends upon the compressed gas its full atomization, and gives the certain kinetic energy, high speed sprays in the type mold surface, layer upon layer mounts, forms a metal shell, namely the cavity internal surfac

10、e, uses to fill the substrate material again</p><p>  electrolytic castings take shape the technology The electrolytic casting takes shape the technical principle to be same with the galvanization, is accord

11、ing to model the mold (ready-made product or female mold which makes according to product blueprint) is the datum (negative pole), places in the electrolytic casting fluid (anode), causes in the electrolytic casting flui

12、d the metallic ion to return to original state a latter place deposition on the type mold, forms the metal shell, after strips </p><p>  cavities surfaces fine pattern takes shape etching technology The etc

13、hing technology is optics, chemistry, the machining synthesis application one kind of technology, its basic principle is makes first the pattern design the film, then in has spread the film on pattern design duplication

14、the photosensitive material on the mold cavity surface, process chemistry processing, the mold cavity surface does not form by the etching partial protectors, then acts according to the mold material quality, t</p>

15、<p>  3 sprinkle to cast into the type system mold technique Sprinkling to cast into technical and common characteristics of the type system mold is according to the kind piece for basis, sprinkle a convex and cav

16、e mold, a surface do not need the machine to process.Make physically to mainly have following several categories type in the mold.</p><p>  4 extrusions takes shape the technology Using the berylliuim copp

17、er alloy good thermal conductivity and the stability, after the solid melt aging treatment of metal, use the swaging pressure to make the mold concave model cavity. Its characteristic is makes the cycle short, the cavity

18、 precision is high (the IT7 level), surface roughness Ra=0.025 mu m, The intensity is high, the life may reach 500,000 times, does not have the environmental pollution. This technology is using the metal material i</p

19、><p>  5 does not have the mold multi- spots forming technology Does not have the mold multi- spots fast forming technology is by CAD/CAM/CAT The technology is the main method about, may adjust the base main b

20、ody group highly using the computer control to form forms the surface, replaces the traditional mold to carry on the three dimensional curved surface forming to the sheet an modern advanced manufacture technology. This t

21、echnology may change the distortion way and the stressful condition at will, </p><p>  6 triumphant Uygur bright steel belt blanking falls the material pattern making technology The new steel belt blanking

22、falls the material pattern making technology is one kind is different with has raised, the concave mold structure steel belt mold generally, it is with specially makes the new fast economical pattern making technology by

23、 the single edge steel belt which the backing strip is composed. This kind of mold weight is light, only then 200kg, the processing precision for ±0.35-0.50mm, </p><p>  7 molds semifinished materials f

24、ast manufacture technology solid casting Because the massive molds are belong to the single unit or the production, the mold semifinished materials manufacture quality and the cycle and the cost to the final mold qualit

25、y and cyclical and the cost influence are very important. The modern mold semifinished materials widely have used the seeds casting technology, the so-called solid casting is (polystyrene PS either polymethacrylate PMMA)

26、 manufactures using the foam</p><p>  8 other aspects technologies in order to simplify the mold the structural design, reduces the mold cost, reduces the mold manufacture cycle, in domestic and foreign als

27、o successively appeared some other aspects new technology application, like trades the mold frame, the ramming unit, the cutting edge built-up welding quickly, inlays the block casting, the nitrogen spring and so on. <

28、;/p><p>  nitrogen springs on mold application The nitrogen spring is one kind of new elastic function part, replaces the spring, the rubber, the polyurethane or the air cushion with it side, it can accurately

29、 provide presses the strength, then may have the greatly initial ball pressure in the small space, does not need pre- tightly, is basically hit the pressure basically in the mold entire work process to be constant. The b

30、all pressure size and the working point position may, accurate, conveniently adj</p><p>  fast trades the mold technology Because product variety increasing, causes the mold in the production the transmuta

31、tion extremely frequently, how thereupon reduces the ramming equipment the down time, enhances the production efficiency, fast traded the mold technology to receive people's attention. At present developed industrial

32、 nation some big companies traded the mold speed to achieve astonishing degree, whether had fast trades the mold technology to become for an enterprise technology adva</p><p>  ramming units combination tech

33、nology The ramming unit combination technology is dies a resolve into each one simple unit the convention to die, according to the working procedure request, the arrangement combination, completes the many kinds of ram

34、ming working procedure when the identical inferior stroke the new craft equipment, the work the ramming unit not with the punch press slide joint, only needs the slide attack then to complete the ramming work. When indep

35、endent employment it is 1 comp</p><p>  may process the plastic in mold manufacture application May process the plastic to be common in the developed industrial nation application, specially in manufacturi

36、ng industry and so on automobile, airplane, mainly replaces the lumber or the metal manufacture automobile body host model, the profile, examines has and the casting model and so on. May process the plastic the main char

37、acteristic is has both the lumber and the metal fine workability, the manufacture craft simple and direct (may us</p><p>  The mold is one of foundation industries, in the globalization market economy and un

38、der each kind of high technology and new technology swift and violent development situation, the fast economical mold has entrusted with the new mission and the brand-new connotation, the classification increases unceasi

39、ngly, the fast economical pattern making material turns towards the multi- varieties seriation to make great strides forward, the craft has the new innovation and the breakthrough unceasingly, is </p><p><

40、;b>  譯文:</b></p><p>  現(xiàn)代快速經(jīng)濟制造模具技術(shù)  </p><p>      隨著全球經(jīng)濟的發(fā)展,新的技術(shù)革命不斷取得新的進展和突破,技術(shù)的飛躍 發(fā)展已經(jīng)成為推動世界經(jīng)濟增長的重要因素。市場經(jīng)濟的不斷發(fā)展,促使工業(yè)產(chǎn)品越來越向多品種、小批量、高質(zhì)量、低成本的方向發(fā)展,為了保持

41、和加強產(chǎn)品在市場上的競爭力,產(chǎn)品的開發(fā)周期、生產(chǎn)周期越來越短,于是對制造各種產(chǎn)品的關(guān)鍵工藝裝備——模具的要求越來越苛刻。 一方面企業(yè)為追求規(guī)模效益,使得模具向著高速、精密、長壽命方向發(fā)展;另一方面企業(yè)為了滿足多品種、小批量、產(chǎn)品更新?lián)Q代快、贏得市場的需要,要求模具向著制造周期短、成本低的快速經(jīng)濟的方向發(fā)展。計算機、激光、電子、新材料、新技術(shù)的發(fā)展,使得快速經(jīng)濟制模技術(shù)如虎添翼,應用范圍不斷擴大,類型不斷增多,創(chuàng)造的經(jīng)濟效益和社

42、會效益越來越顯著。  快速經(jīng)濟制模技術(shù)與傳統(tǒng)的機械加工相比,具有制模周期短、成本低、精度與壽命又能滿足生產(chǎn)上的使用要求,是綜合經(jīng)濟效益比較顯著的一類制造模具的技術(shù),概括起來,有以下幾種類別。   1快速原型制造技術(shù) 快速原型制造技術(shù)簡稱RPM,是80年代后期發(fā)展起來的一種新型制造技術(shù)。美國、日本、英國、以色列、德國、中國都推出了自己的商業(yè)化產(chǎn)品</p><p

43、>  電弧噴涂成型制模技術(shù)  電弧噴涂成型技術(shù)的原理是:利用2根通電的金屬絲之間產(chǎn)生電弧的熱量將金屬絲熔化,依靠高壓氣體將其充分霧化,并給予一定的動能,高速噴射在樣模表面,層層鑲嵌,形成一金屬殼體,即型腔的內(nèi)表面,再用充填基體材料(一般為金屬粉粒與樹脂的復合材料)加以支撐加固,提高其強度和剛性,連同金屬模架組合成模具。這種制模技術(shù)工藝簡單、成本低,制造周期非常短,型腔表面的成型僅需幾個小時,節(jié)省能源和金屬材料

44、,一般型腔表面僅2-3mm厚,仿真性極強,花紋精度可達到0.5μm。 目前該技術(shù)被廣泛地用于飛機、汽車的內(nèi)飾件模具、家電、家俱、制鞋、美術(shù)工藝品等表面形狀復雜及花紋精細的各種聚氨酯制品的吹塑、吸塑、PVC注射、PU發(fā)泡及各類注射成型模具中。     電鑄成型技術(shù) 電鑄成型技術(shù)的原理同電鍍一樣,是依樣模(現(xiàn)成制品或按制品圖紙制成的母模)為基準(陰極),置放在電鑄液中(陽極

45、),使電鑄液中的金屬離子還原后一層一層地沉積在樣模上,形成金屬殼體,將其剝離后,與樣模接觸的表面即為模具的型腔內(nèi)表面。該技術(shù)主要特點是節(jié)省材料、模具制造周期短,電鑄層硬度可達40HRC,提高了耐磨性和壽命,粗糙度</p><p>  型腔表面精細花紋成型的蝕刻技術(shù)蝕刻技術(shù)是光學、化學、機加工綜合應用的一種技術(shù),它的基本原理是先把花紋圖案制成膠片,再把膠片上的花紋圖案復制在已涂上光敏材料的模具型腔表面上,經(jīng)過化學

46、處理,模具型腔表面形成不被蝕刻部分的保護層,再根據(jù)模具材質(zhì),選擇相應蝕刻工藝,將花紋圖案蝕刻在模具內(nèi)表面上。  該技術(shù)的主要特點是時間短、費用低,修補破損花紋圖案可做到天衣無縫。</p><p>  3澆鑄成型制模技術(shù)澆鑄成型制模技術(shù)的共同特點是依樣件為基準,澆鑄出凸、凹模,型腔表面不需要機械加工。</p><p>  4擠壓成型技術(shù)   

47、;利用鈹銅合金的良好的導熱性和穩(wěn)定性,經(jīng)固熔時效處理后,采用冷擠壓制造模具凹模型腔。其特點是制造周期短,型腔精度高(IT7級),表面粗糙度Ra=0.025μm,強度高,壽命可達50萬次,無環(huán)境污染。該技術(shù)是利用金屬材料在細化晶粒、一定成型溫度、低變形速率條件下,材料具有最佳超塑性時,將事先制作好的凸模,用較小的力便可擠壓出凹模的一種快速經(jīng)濟制模技術(shù)。超塑成型材料的典型代表是Zn-22%AL。   5無模多點成

48、形技術(shù)  無模多點快速成形技術(shù)是以CAD/CAM/CAT技術(shù)為主要手段,利用計算機控制高度可調(diào)基本體群形成上下成形面,代替?zhèn)鹘y(tǒng)模具對板料進行三維曲面成形的又一現(xiàn)代先進制造技術(shù)。此項技術(shù)可以隨意改變變形路徑與受力狀態(tài),提高材料的成形極限,可反復成形,以此消除材料內(nèi)部的殘余應力,實現(xiàn)無回彈成形。    6凱維朗(KEVRON)鋼帶沖裁落料制模技術(shù)  新型鋼帶沖裁

溫馨提示

  • 1. 本站所有資源如無特殊說明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請下載最新的WinRAR軟件解壓。
  • 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
  • 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁內(nèi)容里面會有圖紙預覽,若沒有圖紙預覽就沒有圖紙。
  • 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
  • 5. 眾賞文庫僅提供信息存儲空間,僅對用戶上傳內(nèi)容的表現(xiàn)方式做保護處理,對用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對任何下載內(nèi)容負責。
  • 6. 下載文件中如有侵權(quán)或不適當內(nèi)容,請與我們聯(lián)系,我們立即糾正。
  • 7. 本站不保證下載資源的準確性、安全性和完整性, 同時也不承擔用戶因使用這些下載資源對自己和他人造成任何形式的傷害或損失。

最新文檔

評論

0/150

提交評論