手機充電器外殼的成形模具設(shè)計.doc

濟源職業(yè)技術(shù)學院濟源職業(yè)技術(shù)學院 畢畢 業(yè)業(yè) 設(shè)設(shè) 計計 題目 手機充電器外殼的成形模具設(shè)計 系別 專業(yè) 班級 姓名 學號 指導教師 日期 設(shè)計任務(wù)書 設(shè)計題目設(shè)計題目： 手機外殼充電器手機外殼充電器 設(shè)計要求設(shè)計要求： 1. 設(shè)計一個手機充電器外殼； 2. 了解所要生產(chǎn)塑料制品所用的設(shè)備； 3. 設(shè)計的思路要清晰、明確； 4. 正確分析并描繪塑件的工藝，材料的正確性及一些相關(guān)參數(shù)； 5. 選材要注意經(jīng)濟性、實用性等； 設(shè)計進度設(shè)計進度： 11 月 26 日11 月 30 日 收集資料； 12 月 1 日-12 月 5 日 整理設(shè)計思路并計算； 12 月 6 日-12 月 14 日 模具的總體設(shè)計； 12 月 15 日-12 月 22 日 校核模具的相關(guān)參數(shù)； 12 月 23 日-12 月 25 日 打印并上繳論文； 12 月 26 日-12 月 31 日 論文答辯。 指導教師（簽名）：指導教師（簽名）： 謝謝謝謝朋友朋友對對我文章的我文章的賞識賞識，充，充值值后就可以下后就可以下載說載說明明書書，我，我這這 里里還還有一個有一個壓縮壓縮包，里面有相包，里面有相應(yīng)應(yīng)的的 word 說說明明書書和和 cad 圖圖 紙紙。下。下載載后后請請留上你的留上你的郵郵箱號或箱號或 qq 號或號或給給我的我的 qq 留言：留言： 1459919609。我可以將。我可以將壓縮壓縮包送包送給給你。你。歡歡迎朋友下次光迎朋友下次光臨臨！ ！ 濟源職業(yè)技術(shù)學院濟源職業(yè)技術(shù)學院 機電系機電系 2*屆畢業(yè)生畢業(yè)設(shè)計答辯記錄屆畢業(yè)生畢業(yè)設(shè)計答辯記錄 姓 名專 業(yè) 模具設(shè)計與 制造 班 級 答辯時間答辯地點 設(shè)計題目手機外殼充電器 塑料件模具的設(shè)計應(yīng)怎樣選材？塑料件模具的設(shè)計應(yīng)怎樣選材？ 答：答：塑料件的選材應(yīng)從工件的彈性、強度、剛度、耐熱、耐磨損、耐沖擊、耐電弧、絕緣 性、氣味性、塑件的經(jīng)濟價性、制造方法的經(jīng)濟性和材料費用等方面來考慮。 塑料件模具的設(shè)計中尺寸的選用？塑料件模具的設(shè)計中尺寸的選用？ 答：答：模具結(jié)構(gòu)大致是由定模座板、定模板、型腔板、型芯板、模座、推板固定板、推板、 導柱、導套、推件桿、推料桿、回程桿、斜導柱、滑塊和各種螺釘?shù)冉M成,其各部分相互配 合完成工作.在這里應(yīng)分別計算各個零件和組成部分的有關(guān)數(shù)據(jù)。如：長度、寬度、厚度、 材料等。 模具設(shè)計中怎樣確定進料口的位置？模具設(shè)計中怎樣確定進料口的位置？ 答：答：注射與壓注成型的塑件，都必須決定進料口的位置。去處進料口在塑件上殘留的痕跡， 應(yīng)當用磨削或拋光消除。進料口位置應(yīng)根據(jù)材料的特性和塑件結(jié)構(gòu)決定，有時為了容易去 處進料口的痕跡或不影響外觀，對進料口位置可進行調(diào)整。進料口應(yīng)盡可能在塑件上看不 見的表面。如果必須在塑件外表上開進料口時，則應(yīng)把它設(shè)置在凸臺處，以便于切除、磨 削或拋光。用熱塑性樹脂成型的塑件，進料口應(yīng)盡可能設(shè)計成可折斷的或采用金屬切斷的 結(jié)構(gòu)形式。 熱塑性塑料制品常表現(xiàn)的缺陷。熱塑性塑料制品常表現(xiàn)的缺陷。 答：答：1.塑件不完整。 2塑件四周飛邊過長。3塑件有氣泡。 4塑件凹陷。 5塑件尺寸不穩(wěn)定。 6熔接痕 7塑件表面出現(xiàn)波紋。8塑件翹曲變形 9塑件分層脫皮。 分型面設(shè)計原則。分型面設(shè)計原則。 答：1、分型面應(yīng)選擇在塑件外形的最大輪廓處。 2、分型面的選取應(yīng)有利于塑件的留模方式，便于塑件的脫模。 3、保證塑件的尺寸精度。4、滿足塑件外觀的要求。 5、便于模具的制造。 6、減小成形面積。 7、增強排氣效果。 記錄教師（簽名）： 濟源職業(yè)技術(shù)學院畢業(yè)設(shè)計6 6 附件：外文文獻翻譯 英文原文 high-speedhigh-speed machiningmachining andand demanddemand forfor thethe developmentdevelopment ofof high-speed machining is contemporary advanced manufacturing technology an important component of the high-efficiency, high- precision and high surface quality, and other features. this article presents the technical definition of the current state of development of chinas application fields and the demand situation. high-speed machining is oriented to the 21st century a new high- tech, high-efficiency, high-precision and high surface quality as a basic feature, in the automobile industry, aerospace, die manufacturing and instrumentation industries gained increasingly widespread application, and has made significant technical and economic benefits. contemporary advanced manufacturing technology an important component part. hsc is to achieve high efficiency of the core technology manufacturers, intensive processes and equipment packaged so that it has a high production efficiency. it can be said that the high-speed machining is an increase in the quantity of equipment significantly improve processing efficiency essential to the technology. high-speed machining is the major advantages : improve production efficiency, improve accuracy and reduce the processing of cutting resistance. the high-speed machining of meaning, at present there is no uniform understanding, there are generally several points as follows : high cutting speed. usually faster than that of their normal cutting 5 -10 times; machine tool spindle speed high, generally spindle speed in -20000r/min above 10,000 for high-speed cutting; feed at high velocity, usually 15 -50m/min up to 90m/min; for different cutting materials and the wiring used the tool material, high-speed cutting the meaning is not necessarily the same; cutting process, bladed through frequency (tooth passing frequency) closer to the “machine- tool - workpiece “system the dominant natural frequency (dominant natural frequency), can be considered to be high-speed cutting. visibility high-speed machining is a comprehensive concept. 1992. germany, the darmstadt university of technology, professor h. schulz in the 52th on the increase of high-speed cutting for the concept and the scope, as shown in figure 1. think different cutting targets, shown in the figure of the transition area (transition), to be what is commonly called the high-speed cutting, this is also the 濟源職業(yè)技術(shù)學院畢業(yè)設(shè)計7 7 time of metal cutting process related to the technical staff are looking forward to, or is expected to achieve the cutting speed. high-speed machining of machine tools, knives and cutting process, and other aspects specific requirements. several were from the following aspects : high-speed machining technology development status and trends. at this stage, in order to achieve high-speed machining, general wiring with high flexibility of high-speed cnc machine tools, machining centers, by using a dedicated high-speed milling, drilling. these equipment in common is : we must also have high-speed and high- speed spindle system feeding system, cutting can be achieved in high- speed process. high-speed cutting with the traditional cutting the biggest difference is that “machine-tool-workpiece“ the dynamic characteristics of cutting performance is stronger influence. in the system, the machine spindle stiffness, grip or form, a long knife set, spindle broach, torque tool set, performance high-speed impact are important factors. in the high-speed cutting, material removal rate (metal removal rate, mrr), unit time that the material was removed volume, usually based on the “machine-tool-workpiece“ whether processing system “chatter.“ therefore, in order to satisfy the high-speed machining needs, we must first improve the static and dynamic stiffness of machine spindle is particularly the stiffness characteristics. hsc reason at this stage to be successful, a very crucial factor is the dynamic characteristics of the master and processing capability. in order to better describe the machine spindle stiffness characteristics of the project presented new dimensionless parameter - dn value, used for the evaluation of the machine tool spindle structure on the high-speed machining of adaptability. dn value of the so-called “axis diameter per minute speed with the product.“ the newly developed spindle machining center dn values have been great over one million. to reduce the weight bearing, but also with an array of steel products than to the much more light ceramic ball bearings; bearing lubrication most impressive manner mixed with oil lubrication methods. in the field of high-speed machining. have air bearings and the development of magnetic bearings and magnetic bearings and air bearings combined constitute the magnetic gas / air mixing spindle. feed the machine sector, high-speed machining used in the feed drive is usually larger lead, multiple high-speed ball screw and ball array of small-diameter silicon nitride (si3n4) ceramic ball, to reduce its centrifugal and gyroscopic torque; by using hollow-cooling technology to reduce operating at high speed ball screw as 濟源職業(yè)技術(shù)學院畢業(yè)設(shè)計8 8 temperature generated by the friction between the lead screw and thermal deformation. in recent years, the use of linear motor-driven high-speed system of up to such feed system has removed the motor from workstations to slide in the middle of all mechanical transmission links, implementation of machine tool feed system of zero transmission. because no linear motor rotating components, from the role of centrifugal force, can greatly increase the feed rate. linear motor another major advantage of the trip is unrestricted. the linear motor is a very time for a continuous machine shop in possession of the bed. resurfacing of the very meeting where a very early stage movement can go, but the whole system of up to the stiffness without any influence. by using high-speed screw, or linear motor can greatly enhance machine system of up to the rapid response. the maximum acceleration linear motors up to 2-10g (g for the acceleration of gravity), the largest feed rate of up to 60 -200m/min or higher. 2002 world-renowned shanghai pudong maglev train project of maglev track steel processing, using the shenyang machine tool group holdings limited mcnair friendship company production plants into extra-long high-speed system for large-scale processing centers achieve . the machine feeding system for the linear guide and rack gear drive, the largest table feed rate of 60 m / min, quick trip of 100 m / min, 2 g acceleration, maximum speed spindle 20000 r / min, the main motor power 80 kw. x-axis distance of up to 30 m, 25 m cutting long maglev track steel error is less than 0.15 mm. maglev trains for the smooth completion of the project provided a strong guarantee for technology in addition, the campaign machine performance will also directly affect the processing efficiency and accuracy of processing. mold and the free surface of high-speed machining, the main wiring with small cut deep into methods for processing. machine requirements in the feed rate conditions, should have high-precision positioning functions and high-precision interpolation function, especially high- precision arc interpolation. arc processing is to adopt legislation or thread milling cutter mold or machining parts, the essential processing methods. cutting tools tool material development high-speed cutting and technological development of the history, tool material is continuous progress of history. the representation of high-speed cutting tool material is cubic boron nitride (cbn). face milling cutter use of cbn, its cutting speed can be as high as 5000 m / min, mainly for the gray cast iron machining. polycrystalline diamond (pcd) has been described as a tool of the 21st century tool, it is particularly applicable to the cutting 濟源職業(yè)技術(shù)學院畢業(yè)設(shè)計9 9 aluminum alloy containing silica material, which is light weight metal materials, high strength, widely used in the automobile, motorcycle engine, electronic devices shell, the base, and so on. at present, the use of polycrystalline diamond cutter face milling alloy, 5000m/min the cutting speed has reached a practical level. in addition ceramic tool also applies to gray iron of high-speed machining; tool coating : cbn and diamond cutter, despite good high-speed performance, but the cost is relatively high. using the coating technology to make cutting tool is the low price, with excellent mechanical properties, which can effectively reduce the cost. now high-speed processing of milling cutter, with most of the wiring between the ti-a1-n composite technology for the way of multi- processing, if present in the non-ferrous metal or alloy material dry cutting, dlc (diamond like carbon) coating on the cutter was of great concern. it is expected that the market outlook is very significant; tool clamping system : tool clamping system to support high-speed cutting is an important technology, currently the most widely used is a two-faced tool clamping system. has been formally invested as a commodity market at the same clamping tool system are : hsk, km, bigplus. nc5, aho systems. in the high-speed machining, tool and fixture rotary performance of the balance not only affects the precision machining and tool life. it will also affect the life of machine tools. so, the choice of tool system, it should be a balanced selection of good products. process parameters cutting speed of high-speed processing of conventional shear velocity of about 10 times. for every tooth cutter feed rate remained basically unchanged, to guarantee parts machining precision, surface quality and durability of the tool, feed volume will also be a corresponding increase about 10 times, reaching 60 m / min, some even as high as 120 m / min. therefore, high-speed machining is usually preclude the use of high-speed, feed and depth of cut small cutting parameters. due to the high-speed machining cutting cushion tend to be small, the formation of very thin chip light, cutting put the heat away quickly; if the wiring using a new thermal stability better tool materials and coatings, using the dry cutting process for high-speed machining is the ideal technology program. high-speed machining field of application flexible efficient production line to adapt to the needs of new models, auto body panel molds and resin- prevention block the forming die. must shorten the production cycle and reduce the cost of production and, therefore, we must make great efforts to promote the production of high-speed die in the process. 濟源職業(yè)技術(shù)學院畢業(yè)設(shè)計10 10 saic affiliated with the company that : compared to the past, finishing, further precision; the same time, the surface roughness must be met, the bending of precision, this should be subject to appropriate intensive manual processing. due to the extremely high cutting speed, and the last finishing processes, the processing cycle should be greatly reduced. to play for machining centers and boring and milling machining center category represented by the high-speed machining technology and automatic tool change function of distinctions potential to improve processing efficiency, the processing of complex parts used to be concentrated as much as possible the wiring process, that is a fixture in achieving multiple processes centralized processing and dilute the traditional cars, milling, boring, thread processing different cutting the limits of technology, equipment and give full play to the high-speed cutting tool function, nc is currently raising machine efficiency and speed up product development in an effective way. therefore, the proposed multi-purpose tool of the new requirements call for a tool to complete different parts of the machining processes, atc reduce the number of atc to save time, to reduce the quantity and tool inventory, and management to reduce production costs. more commonly used in a multifunctional tool, milling, boring and milling, drilling milling, drilling-milling thread-range tool. at the same time, mass production line, against the use of technology requires the development of special tools, tool or a smart composite tool, improve processing efficiency and accuracy and reduced investment. in the high-speed cutting conditions, and some special tools can be part of the processing time to the original 1 / 10 below, results are quite remarkable. hsc has a lot of advantages such as : a large number of materials required resection of the workpiece with ultrafine, thin structure of the workpiece, traditionally, the need to spend very long hours for processing mobile workpiece and the design of rapid change, short product life cycle of the workpiece, able to demonstrate high-speed cutting brought advantages. 濟源職業(yè)技術(shù)學院畢業(yè)設(shè)計11 11 中文譯文 高速切削加工的發(fā)展及需求高速切削加工的發(fā)展及需求 高速切削加工是當代先進制造技術(shù)的重要組成部分，擁有高效率、高精度 及高表面質(zhì)量等特征。本文介紹此技術(shù)的定義、發(fā)展現(xiàn)狀、適用領(lǐng)域以及中國 的需求情況。 高速切削加工是面向 21 世紀的一項高新技術(shù)，它以高效率、高精度和高表 面質(zhì)量為基本特征，在汽車工業(yè)、航空航天、模具制造和儀器儀表等行業(yè)中獲 得了愈來愈廣泛的應(yīng)用，并已取得了重大的技術(shù)經(jīng)濟效益，是當代先進制造技 術(shù)的重要組成部分。 高速切削是實現(xiàn)高效率制造的核心技術(shù)，工序的集約化和設(shè)備的通用化使 之具有很高的生產(chǎn)效率。可以說，高速切削加工是一種不增加設(shè)備數(shù)量而大幅 度提高加工效率所必不可少的技術(shù)。高速切削加工的優(yōu)點主要在于：提高生產(chǎn) 效率、提高加工精度及降低切削阻力。 有關(guān)高速切削加工的含義，目前尚無統(tǒng)一的認識，通常有如下幾種觀點： 切削速度很高，通常認為其速度超過普通切削的 5-10 倍；機床主軸轉(zhuǎn)速很高， 一般將主軸轉(zhuǎn)速在 10000-20000r/min 以上定為高速切削；進給速度很高，通常 達 15-50m/min，最高可達 90m/min；對于不同的切削材料和所釆用的刀具材 料，高速切削的含義也不盡相同；切削過程中，刀刃的通過頻率(tooth passing frequency)接近于“機床刀具工件”系統(tǒng)的主導自然頻率 濟源職業(yè)技術(shù)學院畢業(yè)設(shè)計12 12 (dominant natural frequency)時，可認為是高速切削?？梢姼咚偾邢骷庸な?一個綜合的概念。 1992 年，德國 darmstadt 工業(yè)大學的 h. schulz 教授在 cirp 上提出了高 速切削加工的概念及其涵蓋的范圍，如圖 1 所示。認為對于不同的切削對象， 圖中所示的過渡區(qū)(transition)即為通常所謂的高速切削範圍，這也是當時金 屬切削工藝相關(guān)的技術(shù)人員所期待或者可望實現(xiàn)的切削速度。 高速切削加工對機床、刀具和切削工藝等方面都有一些具體的要求。下面 分別從這幾個方面闡述高速切削加工技術(shù)的發(fā)展現(xiàn)狀和趨勢。 現(xiàn)階段，為了實現(xiàn)高速切削加工，一般釆用高柔性的高速數(shù)控機床、加工 中心，也有釆用專用的高速銑、鉆床。這些設(shè)備的共同之處是：必須同時具有 高速主軸系統(tǒng)和高速進給系統(tǒng)，才能實現(xiàn)材料切削過程的高速化。高速切削與 傳統(tǒng)切削最大的區(qū)別是， “機床刀具工件”系統(tǒng)的動態(tài)特性對切削性能有更 強的影響力。在該系統(tǒng)中，機床主軸的剛度、刀柄形式、刀長設(shè)定、主軸拉刀 力、刀具扭力設(shè)定等，都是影響高速切削性能的重要因素。 在高速切削中，材料去除率(metal removal rate，mrr)，即單位時間內(nèi)材 料被切除的體積，通常受限于“機床-刀具-工件”工藝系統(tǒng)是否出現(xiàn)“顫振” 。 因此，為了滿足高速切削加工的需求，首先要提高機床動靜剛度尤其是主軸的 剛度特性?，F(xiàn)階段高速切削之所以能夠成功，一個很關(guān)鍵的因素在于對系統(tǒng)動 態(tài)特性問題的掌握和處理能力。 為了更好地描述機床主軸的剛度特性，工程上提出新的無量綱參數(shù)dn 值，用以評價機床的主軸結(jié)構(gòu)對高速切削加工的適應(yīng)性。所謂 dn 值即“主軸直 徑與每分鐘轉(zhuǎn)速之積” 。新近開發(fā)的加工中心主軸 dn 值大都已超過 100 萬。為 了減輕軸承的重量，還釆用了比鋼制品要輕得多的陶瓷球軸承；軸承潤滑方式 大都釆用油氣混合潤滑方式。在高速切削加工領(lǐng)域，目前已開發(fā)空氣軸承和磁 軸承以及由磁軸承和空氣軸承合并構(gòu)成的磁氣/空氣混合主軸。 在機床進給機構(gòu)方面，高速切削加工所用的進給驅(qū)動機構(gòu)通常都為大導 程、多頭高速滾珠絲槓，滾珠釆用小直徑氮化硅（si3n4）陶瓷球，以減少其離 心力和陀螺力矩；釆用空心強冷技術(shù)來減少高速滾珠絲槓運轉(zhuǎn)時由于摩擦產(chǎn)生 溫升而造成的絲槓熱變形。 近幾年來，用直線電機驅(qū)動的高速進給系統(tǒng)問世，這種進給方式取消了從 電動機到工作臺溜板之間的一切中間機械傳動環(huán)節(jié)，實現(xiàn)了機床進給系統(tǒng)的零 傳動。由于直線電機沒有任何旋轉(zhuǎn)元件，不受離心力的作用，可以大大提高進 給速度。直線電機的另一大優(yōu)點是行程不受限制。直線電機的次極是一段一段 連續(xù)鋪在機床的床身上。次極鋪到哪里，初極工作臺就可運動到哪里，而且對 整個進給系統(tǒng)的剛度沒有任何影響。釆用高速絲槓或直線電機，能夠大大提高 機床進給系統(tǒng)的快速響應(yīng)。直線電機最高加速度可達 2-10g(g 為重力加速度)， 最大進給速度可達 60-200m/min 或更高。 2002 年舉世矚目的上海浦東磁懸浮列車工程中的磁浮軌道鋼梁加工，釆用 沈陽機床控股有限公司集團中捷友誼公司廠生產(chǎn)的超長進給系統(tǒng)高速大型加工 中心實現(xiàn)。該機床的進給系統(tǒng)為直線導軌和齒輪齒條傳動，工作臺最大進給速 度 60m/min，快速行程 100m/min，加速度 2g，主軸最高轉(zhuǎn)速 20000r/min，主電 機功率 80kw。其 x 軸的行程長達 30m，切削 25m 長的磁浮軌道鋼梁誤差小于 0.15mm，為磁懸浮列車工程的順利竣工提供了有力的技術(shù)保證。 此外，機床的運動性能也將直接影響加工效率和加工精度。在模具及自由 濟源職業(yè)技術(shù)學院畢業(yè)設(shè)計13 13 曲面的高速切削加工中，主要釆用小切深大進給的加工方法。要求機床在大進 給速度條件下，應(yīng)具有高精度定位功能和高精度插補功能，特別是圓弧高精度 插補。圓弧加工是釆用立銑刀或螺紋刀具加工零部件或模具時，必不可少的加 工方法。 刀具材料的發(fā)展：高速切削技術(shù)發(fā)展的歷史，也就是刀具材料不斷進步的 歷史。高速切削的代表性刀具材料是立方氮化硼（cbn） 。端面銑削使用 cbn 刀 具時，其切削速度可高達 5000m/min，主要用于灰口鑄鐵的切削加工。聚晶金 剛石（pcd）刀具被稱之為 21 世紀的刀具，它特別適用于切削含有 sio2 的鋁合 金材料，而這種金屬材料重量輕、強度高，廣泛地應(yīng)用于汽車、摩托車發(fā)動 機、電子裝置的殼體、底座等方面。目前，用聚晶金剛石刀具端面銑削鋁合金 時，5000m/min 的切削速度已達到實用化水平，此外陶瓷刀具也適用于灰口鑄 鐵的高速切削加工； 涂層刀具：cbn 和金剛石刀具盡管具有很好的高速切削性能，但成本相對 較高。釆用涂層技術(shù)能夠使切削刀具既價格低廉，又具有優(yōu)異性能，可有效降 低加工成本?，F(xiàn)在高速加工用的立銑刀，大都釆用 tiain 系的復合多層涂鍍技 術(shù)進行處理，如目前在對鋁合金或有色金屬材料進行干式切削 時，dlc（diamond like carbon）涂層刀具就受到極大的關(guān)注，預計其巿場前 景十分可觀； 刀具夾持系統(tǒng)：刀具的夾持系統(tǒng)是支撐高速切削的重要技術(shù)，目前使用最 為廣泛的是兩面夾緊式工具系統(tǒng)。已作為商品正式投放巿場的兩面夾緊式工具 系統(tǒng)主要有：hsk、km、bigplus、nc5、aho 等系統(tǒng)。 在高速切削的情況下，刀具與夾具回轉(zhuǎn)平衡性能的優(yōu)劣，不僅影響加工精 度和刀具壽命，而且也會影響機床的使用壽命。因此，在選擇工具系統(tǒng)時，應(yīng) 盡量選用平衡性能良好的產(chǎn)品。 高速加工的切削速度為常規(guī)切速的 10 倍左右。為了使刀具每齒進給量基本 保持不變，以保證零件的加工精度、表面質(zhì)量和刀具的耐用度，則進給量也必 須相應(yīng)提高 10 倍左右，達到 60m/min 以上，有的甚至高達 120m/min。因此， 高速切削加工通常是釆用高轉(zhuǎn)速、大進給和小切深的切削工藝參數(shù)。由于高速 切削的切削余量往往很小，所形成的切屑很薄很輕，把切削時產(chǎn)生的熱量很快 帶走；若釆用全新耐熱性更好的刀具材料和涂層，釆用干切削工藝也是高速切 削加工的理想工藝方案。 用高速加工中心組成高效率的柔性生產(chǎn)線(ftl 或 fml)，具有小型化、柔性 突出以及易于變更加工內(nèi)容等顯著特點。圖 2 為上汽集團某發(fā)動機公司利用該 生產(chǎn)線加工發(fā)動機機體、汽缸蓋、濾清器座等工件的實例。 為了盡快適應(yīng)新車型的需要，汽車車身覆蓋件模具和樹脂防沖擋的成形模 具等，均必須縮短制作周期和降低生產(chǎn)成本，因此，必須下大力推進模具生產(chǎn) 高速化的進程。上汽集團所屬各公司認為：與過去的精加工相比，進一步實現(xiàn) 高精度化；同時必須滿足表面粗糙度、彎曲度的精度要求，為此應(yīng)施以適當?shù)?手工精修加工，由于切削速度的極大提高，與過去的精加工工序相比，加工周 期應(yīng)大幅度縮短。 為了發(fā)揮以車削加工中心和鏜銑類加工中心為代表的高速切削加工技術(shù)和 自動換刀功能的優(yōu)勢，提高加工效率，對復雜零件的加工應(yīng)盡可能釆用集中工 序的原則，即要求在一次裝夾中實現(xiàn)多道工序