畢 業(yè) 設(shè) 計(論 文)任 務(wù) 書
設(shè)計(論文)題目:泵體機加工工藝及其夾具設(shè)計
學(xué)生姓名:
發(fā)任務(wù)書日期:年月日
任務(wù)書填寫要求
1.畢業(yè)設(shè)計(論文)任務(wù)書由指導(dǎo)教師根據(jù)各課題的具體情況填寫,經(jīng)學(xué)生所在專業(yè)的負責人審查、系
(院)領(lǐng)導(dǎo)簽字后生效。此任務(wù)書應(yīng)在畢業(yè)設(shè)計(論文)開始前一周內(nèi)填好并發(fā)給學(xué)生。
2.任務(wù)書內(nèi)容必須用黑墨水筆工整書寫,不得涂改或潦草書寫;或者按教務(wù)處統(tǒng)一設(shè)計的電子文檔標準格式
(可從教務(wù)處網(wǎng)頁上下載)打印,要求正文小4號宋體,1.5倍行距,禁止打印在其 上 。
3.任務(wù)書內(nèi)填寫的內(nèi)容,必須 學(xué)生畢業(yè)設(shè)計(論文) 的情況 一 , ,應(yīng) 經(jīng) 所在專業(yè)及
系(院) 領(lǐng)導(dǎo)審 后 可 填寫。
4.任務(wù)書內(nèi) 學(xué)院 、 專業(yè) 名 的填寫,應(yīng)寫 文 ,不 寫 字 。學(xué)生的 學(xué)號 要寫
號,不 寫?后2¢或1¢ 字。
5.任務(wù)書內(nèi) 要£?文¥ 的填寫,應(yīng)按?§currency1'“?學(xué)院?“畢業(yè)設(shè)計(論文)?寫fifl 的要求書寫。
6. 年月日 日期的填寫,應(yīng) 按?–標GB/T 7408—94§ 據(jù)? ?·格式、 ??·、日期 ??
?”? fi…的要求,一‰用 ? 字書寫。` 2002年4月2日 或 2002-04-02”。
畢 業(yè) 設(shè) 計(論 文)任 務(wù) 書
1.?畢業(yè)設(shè)計(論文)課題應(yīng)′?的目的:
?ˉ學(xué)生?˙¨用所學(xué)的 ??論、專業(yè) ? 專業(yè) ?? ?˙ˇ— 課題的 ; 其專
業(yè) 水 ,計 機¨用水 及書 及 ?′ ; 其 工?設(shè)計的 , a 專業(yè)工
?¢打下 ?
2.?畢業(yè)設(shè)計(論文)課題任務(wù)的內(nèi)容 要求(??o始 據(jù)、? 要求、工 要求 ):
一 泵體,設(shè)計其機加工工藝及專用夾具, 要??: …? 、加工 ?,并 ? ??
???˙?; 機 加工工藝 ? 一套; 部工序的機 加工工序 ; 專用夾具?? 裝配
?,專用夾具三維造型設(shè)計 。
畢 業(yè) 設(shè) 計(論 文)任 務(wù) 書
3. ?畢業(yè)設(shè)計(論文)課題 果的要求〔????、ˇ物 硬?要求〕:
1.外文£?資料及譯文(附o文);
2.畢業(yè)設(shè)計開題報告一份;
3. 寫設(shè)計說明書一份;
4. 整的設(shè)計? 工藝 一套。
4. 要£?文¥:
[1] 崇凱.機 設(shè)計指南[M].北京:化學(xué)工業(yè)出版社,2006.
[2] 吉衛(wèi)喜.機 造? [M].北京:機 工業(yè)出版社,2011.
[3] 黃鶴汀.機 造裝備.第二版[M].北京:機 工業(yè)出版社,2009.
[4] 慧貞.機 造裝備設(shè)計.第三版[M].北京:機 工業(yè)出版社,2009.
[5] 劉鴻文.材料 學(xué).第四版[M].北京: 教育出版社,2010.
[6] 劉品.機 精度設(shè)計與檢測 ?.第六版[M].哈爾濱:哈爾濱工業(yè)大學(xué)出版社,2009
[7] 王光斗.機床夾具設(shè)計手冊.第五版[M].上海:上海“學(xué)? 出版社,2000.
[8] 周開勤.機 ??手冊[M]. 北京: 教育出版社,2001.
[9] 許福玲.液壓與氣壓傳動.第三版[M].北京:機 工業(yè)出版社,2007.
[10] 南京市機 研究所.currency1屬切削機床夾具?冊.下冊 [M].南京:機 工業(yè)出版社,1984.
[11] 李洪.機 加工工藝手冊[M].北京:北京出版社,1990.
[12] 李益民.機 工藝設(shè)計手冊[M].北京:機 工業(yè)出版社,2003.
[13] 何愛華. 不fi則??的夾具設(shè)計[J]. 現(xiàn) 造工?,2007,(5);12-15
[14] 劉戰(zhàn)強. 先進切削加工? ?述[J]. 工具? ,2003,37(5):3-6
[15] Rajput RK.Element of Mechanical Engineering[M].Katson Publ.House,1985.
[16] A. R. C. Sharman.Tool life and surface integrity aspects when drilling and
hole making in Inconel 718[J]. Journal of Materials Processing
Technology,2008,vol.200 /no.1-3: 424-432.
[17] Design and execution of manufacturing enterprise models. International[J].
Journal of Computer Integrated Manufacturing. Vol 13,NO,1,2000
畢 業(yè) 設(shè) 計(論 文)任 務(wù) 書
5.?畢業(yè)設(shè)計(論文)課題工 進度計劃:
2015.12.16-2.16.3.9 畢業(yè)ˇ習調(diào)研, 開題報告、 文翻譯、論文大綱
2016.3.19-2016.4.25 ?論文草稿,4月 旬 期檢查
2016.4.26-2016.5.6 ?論文…稿
2016.5.6-2016.5.13 準備答辯
2016.5.13-2016.5.26 答辯, 績評…,修改 ?終稿
所在專業(yè)審查意見:
通
負責人: 2016 年 1 月 13 日
畢 業(yè) 設(shè) 計(論 文)開 題 報 告
設(shè)計(論文)題目:泵體機加工工藝及其夾具設(shè)計
學(xué)生姓名:
年 月 日
開題報告填寫要求
1.開題報告(含“文獻綜述”)作為畢業(yè)設(shè)計(論文)答辯委員會對學(xué)生答辯資格審查的依據(jù)材料之一。此
報告應(yīng)在指導(dǎo)教師指導(dǎo)下,由學(xué)生在畢業(yè)設(shè)計(論文)工作前期內(nèi)完成,經(jīng)指導(dǎo)教師簽署意見及所在專業(yè)審查
后生效;
2.開題報告內(nèi)容必須用黑墨水筆工整書寫或按教務(wù)處統(tǒng)一設(shè)計的電子文檔標準格式打印,禁止打印在其它紙
上后剪貼,完成后應(yīng)及時交給指導(dǎo)教師簽署意見;
3.“文獻綜述”應(yīng)按論文的框架成文,并直接書寫(或打印)在本開題報告 一 目內(nèi),學(xué)生寫文獻綜述的
文獻應(yīng) 15 ( );
4. 年月日 日期的填寫,應(yīng) 按 標GB/T 7408—94 據(jù) 交 格式 交 日期 時
?¢的要求,一£用?¥? §書寫。currency1“2004年4月26日”或“2004-04-26”。
5 開題報告(文獻綜述)§體'按“體 ???書寫,fi fl1.5 。
畢 業(yè) 設(shè) 計(論文) 開 題 報 告
1.–?畢業(yè)設(shè)計(論文)?題· ,?據(jù)所查?的文獻資料,??”寫 1000§?…的文獻綜述:
一 ?題‰ ? 泵體機`′應(yīng)用 ?? ˉ工 ?˙ 電¨ ? ?材 ?及 ?ˇ‰ fi業(yè)。目前
內(nèi)的泵體機— 的 本 日本 統(tǒng)的工業(yè) , 的 本上 ?
的 a上 的, ?經(jīng) ?一¢的??。o目前 的 — ,在 開 上 ? 的
要 。 泵在 應(yīng)用?`′的 用機 — 。據(jù)統(tǒng)計, ?年泵?— 的生——?在40? ?上。
?年 電 的? 之一 消耗在泵— 上, 泵?— 的制造廠 在6000 ?上。泵在輸送液體 提供
ˉ學(xué)反應(yīng)的壓¨流 中起作用,并在?多裝置中起到調(diào)節(jié)溫度的作用。在農(nóng)業(yè)中,農(nóng)村大片耕地,?年 需要
大 的水泵對耕地?fi灌溉。在汽車業(yè)中,泵的應(yīng)用更為`′,氣泵 ?泵及水泵 在汽車也中顯得特別的重
要, 汽車生—中 可缺 的一部 。在?筑業(yè)中,泵主要用 混凝土的運輸。在礦業(yè) ?工業(yè)中,泵也
使用?多的設(shè)備。 內(nèi)泵 的 狀 泵工業(yè)起步 20世紀初,由 多年戰(zhàn)爭劫難, 本處 停滯狀態(tài)。
新中 成立后,早期主要汲取前蘇聯(lián)泵 ,在 時的特¢歷史條件下推動?泵的 。接著 泵fi業(yè)廠在
農(nóng)業(yè)排灌 電站 礦山 ?? ˉ工及軍工配套 方面‰制出較高水平的新型泵.改革開放?來,伴隨著中
經(jīng)濟的飛速 ,泵業(yè)也得到 足的 。 內(nèi)泵體?零件加工線的一 新突破 ?三臺 高速加工中 為
主體的VE 配泵泵體新的生—線,實踐證明,它工序高度集中,生—率高,加工精度高,輔助工序減 ,并
使生—計劃組織工作得?簡ˉ。 然由 工序高度集中,currency1果設(shè)備可靠 使用 具 上, 可
—生 機 。 要求加工設(shè)備具 的 ¢ 可靠 。 此對機 的主 動部件 導(dǎo) 液壓
統(tǒng) 統(tǒng) 制 統(tǒng) 提出??高的要求。在生—中 用 ?的機 具, 用氣動 液動 多件裝
夾 高效夾具, 用可 工作臺 可 夾具 多 夾具 可?使加工高效 簡 可靠。 ?題‰ 意
在大型泵體部件的加工工藝中, 用 ?的設(shè)備 工裝 ?¢— £ , 泵fi業(yè) ?¥求工藝
?新 突破的§¨方currency1。 綜上所述,在泵體零件機 加工工藝 專用夾具設(shè)計方面的‰ ,主要 ' 用
?的設(shè)備 工裝 ?及對機 夾具的要求 方面“ ,? 使工序集中,提高生—率,提高加工精度,
減 輔助工序,??成本,使生—計劃組織工作得?簡ˉ。o 由 工序高度集中容fi造成 機 , 一
需要fl 的–題, ?–題出 在機 的 ¢ 可靠 ,對設(shè)備的使用 ??及 具的制造 上。泵
一· 用機 ,應(yīng)用 ?`′, 新??用泵 ?出 。?currency1: ”泵 ?水推?泵 計…機‰ 泵 ?調(diào)泵
導(dǎo) ?泵 ?氣混輸泵 `氣′?泵 ??平臺?水泵 。可 ˉ在著應(yīng) 用泵的地方 用泵,新的用
泵??也會 ?出 , 需要 ??意 并˙¨開 。所?,對泵體零件機 加工工藝 專用夾具設(shè)計的
‰ ¨要 ??fi。 [1] ?.機 設(shè)計指?[M]. ?:ˉ學(xué)工業(yè)出?ˇ,2006. [2] — .機 制造
[M]. ?:機 工業(yè)出?ˇ,2011. [3] .機 制造裝備. ?[M]. ?:機 工業(yè)出?ˇ,
2009. [4] .機 制造裝備設(shè)計. 三?[M]. ?:機 工業(yè)出?ˇ,2009. [5] 文.材料¨學(xué).
??[M]. ?:高 教 出?ˇ,2010. [6] .機 精度設(shè)計 a. ?[M]. :
工業(yè)大學(xué)出?ˇ,2009 [7] ? .液壓 氣壓 動. 三?[M]. ?:機 工業(yè)出?ˇ,2007. [8]
??a機 ‰ 所.? 機 夾具 .下 [M].??:機 工業(yè)出?ˇ,1984. [9] ???. ?
o零件的夾具設(shè)計[J]. 制造工 ,2007,(5);12-15 [10] 戰(zhàn) . ? 加工 綜述
[J]. 工具 ,2003,37(5):3-6 [11] 機 設(shè)計 委會.機 設(shè)計 fi本 動
?[M]. ?: 機 工業(yè)出?ˇ,2007 [12] 大 , ? .機 設(shè)計? 設(shè)計[M]. ?: ?工業(yè)大
學(xué)出?ˇ.2000.56-99 [13] ?,紀名?.機 設(shè)計[M]. ?:高 教 出?ˇ.2001.312-316
[14]?立 .機 設(shè)計 a[M]. ?:高 教 出?ˇ.2008 [15]?立 .機 制造 a[M].
?:高 教 出?ˇ.2008
畢 業(yè) 設(shè) 計(論文) 開 題 報 告
2.本?題要‰ 或fl 的–題 ? 用的‰ ( ):
?題‰ 內(nèi)容 在 泵體機`′運用 fi 業(yè)中, ?題主要選取其中一·泵體?fi‰ ,設(shè)計其加工工
藝及其專業(yè)夾具。 主要 ?下 方面 1 零件工藝 析。 2 ?¢毛坯·? 制造方 及加工余 。
3 ?¢零件的機 加工工藝過 ¢ 準選擇 面加工方案的?¢ 加工階 的劃 處
輔助工序的安排 工序順序?¢ 工藝方案的對比 析。 4 ?¢ 工序尺寸及公差 用 選擇 工序
時 ¢額及經(jīng)濟 析。 5 設(shè)計一道工序的專用機 夾具 夾具的¢ 夾緊方案 ¢ 原件選擇 ¢
誤差計… 夾緊¨計…。 6 對所設(shè)計夾具?fi 析 說明。?題‰ 1)前期準備:收集相 資料,
查?中 文獻 '教老師 同學(xué)討論。學(xué)習掌握機 制造工藝? 裝備設(shè)計的 本方 ,熟悉機 設(shè)計 工
藝設(shè)計的 本 論,并 學(xué)習使用Auto CAD Pro/e軟件。 2)設(shè)計工藝過 卡及工序卡一套,并 繪制
夾具裝配 夾具零件 及專用夾具三 造型設(shè)計 。 3)查找相 資料,完成設(shè)計說明書。
畢 業(yè) 設(shè) 計(論文) 開 題 報 告
指導(dǎo)教師意見:
1.對“文獻綜述”的評語:
'“文獻綜述”看 生在做論文之前對相 資料?fi?收集及查?,對所要‰ 的對象及‰ 的步驟 ?一¢
的認識。相 生 過§¨ 順利完成本次畢業(yè)設(shè)計。
2.對本?題的深度 `度及工作 的意見 對設(shè)計(論文)–果的預(yù) :
本?題工作 難度適中。?題具 一¢的實際意 ,相 過本?題的‰ , 設(shè)計出在 符?實際應(yīng)用
的— 。
3. 否同意開題:√ 同意 □ 同意
指導(dǎo)教師:
2016 年 03 月 07 日
所在專業(yè)審查意見:
同意
負責?:
2016 年 03 月 08 日
畢 業(yè) 設(shè) 計(論 文)外 文 參 考 資 料 及 譯 文
譯文題目: Mechanical processing and fixture design 論如何提高機械加工精度
學(xué)生姓名:
Mechanical processing and fixture design
Have a shape as a processing method, all machining process for the production of the most commonly used and most important method. Machining process is a process generated shape, in this process, Drivers device on the work piece material to be in the form of chip removal. Although in some occasions, the workpiece under no circumstances, the use of mobile equipment to the processing, However, the majority of the machining is not only supporting the workpiece also supporting tools and equipment to complete.
Machining methods roughly in the following situations:
1) vehicles, milling, planing, drilling, grinding and other general machining parts, and then necessary bench repair, assembly into component parts.
2) high precision parts, only ordinary machining to ensure high machining accuracy, and thus requires the use of precision machine tools for processing.
3) in order to make parts especially complex shape punch and concave model hole and cavity machining becomes more automated, reduce fitter repair workload, requires the use of CNC machine tools (such as three coordinate CNC milling machine, machining center, NC grinder equipment processing parts.
Machining know the process has two aspects. Small group of low-cost production. For casting, forging and machining pressure, every production of a specific shape of the workpiece, even a spare parts, almost have to spend the high cost of processing. Welding to rely on the shape of the structure, to a large extent, depend on effective in the form of raw materials. In general, through the use of expensive equipment and without special processing conditions, can be almost any type of raw materials, mechanical processing to convert the raw materials processed into the arbitrary shape of the structure, as long as the external dimensions large enough, it is possible. Because of a production of spare parts, even when the parts and structure of the production batch sizes are suitable for the original casting, Forging or pressure processing to produce, but usually prefer machining.
Strict precision and good surface finish, machining the second purpose is the establishment of the high precision and surface finish possible on the basis of. Many parts, if any other means of production belonging to the large-scale production, Well Machining is a low-tolerance and can meet the requirements of small batch production. Besides, many parts on the production and processing of coarse process to improve its general shape of the surface. It is only necessary precision and choose only the surface machining. For instance, thread, in addition to mechanical processing, almost no other processing method for processing. Another example is the blacksmith pieces keyhole processing, as well as training to be conducted immediately after the mechanical completion of the processing.
Mechanical processing is the most important part of the high speed machining. 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 China''s 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 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 h igh-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.
The machining process is the soul, the core and key manufacturing technology, is the most active factor in production. The process is the metal cutting tool or grinding and other processing methods to processing the workpiece, the workpiece to achieve the required shape, size, surface rough degree and the mechanical and physical properties of, and become qualified parts. The machining process planning is the process documents of products or parts machining process and operation method, all relevant production personnel should strictly enforce discipline, conscientiously implement the file . The fixture is a device of machine tool clamping workpiece, its role is to enable the workpiece relative to the machine tool and cutter has a correct position, and keep this position unchanged in the process. Use jig can effectively guarantee the processing quality, improve production efficiency, reduce production costs, expanding the scope of machine tool technology, reduces the labor intensity of the workers, to guarantee the safety in production and therefore fixture in machinery manufacturing occupies important position . Considering the machining process planning and fixture used in the production of pump body directly affects the processing quality and production efficiency, so the research subject of pump body of machining process and fixture design has a very important significance.
Automatic Fixture Design
Assembly equipment used in the traditional synchronous fixture put parts of the fixture mobile center, to ensure that components from transmission from the plane or equipment plate placed after removal has been scheduled for position. However, in certain applications, mobile mandatory parts of the center line, it may cause parts or equipment damage. When parts vulnerability and may lead to a small vibration abandoned, or when their location is by machine spindle or specific to die, Tolerance again or when the request is a sophisticated, it would rather let the fixture to adapt to the location of parts, and not the contrary. For these tasks, Elyria, Ohio, the company has developed Zaytran a general non-functional data synchronization West category FLEXIBILITY fixture. Fixture because of the interaction and synchronization devices is independent; the synchronous device can use sophisticated equipment to replace the slip without affecting the fixture force. Fixture specification range from 0.2 inches itinerary, 5 pounds clamping force of the six-inch trip, 400-inch clamping force. The characteristics of modern production are becoming smaller and smaller quantities and product specifications biggest changes. Therefore, in the final stages of production, assembly of production, quantity and product design changes appear to be particularly vulnerable. This situation is forcing many companies to make greater efforts to rationalize the extensive reform and the previously mentioned case of assembly automation. Despite flexible fixture behind the rapid development of flexible transport and handling devices, such as backward in the development of industrial robots, it is still expected to increase the flexibility fixture. In fact the important fixture devices -- the production of the devices to strengthen investment on the fixture so that more flexibility in economic support holders.
According to their flexibility and fixture can be divided into: special fixture, the fixture combinations, the standard fixture, high flexible fixture. Flexible fixture on different parts of their high adaptability and the few low-cost replacement for the characteristic.
Forms can transform the structure of the flexible fixture can be installed with the change of structure components (such as needle cheek plate, Multi-chip components and flake cheek plate), a non-standard work piece gripper or clamping elements (for example: commencement standard with a clamping fixture and mobile components fixture supporting documents), or with ceramic or hardening of the intermediary substances (such as : Mobile particle bed fixture and heat fixture tight fixture). To production, the parts were secured fixture, the need to generate clamping function, its fixture with a few unrelated to the sexual submissive steps.
According to the processing was part of that foundation and working characteristics to determine the work piece fixture in the required position, then need to select some stability flat combination, These constitute a stable plane was fixed in the work piece fixture set position on the clamp-profile structure, all balanced and torque, it has also ensured that the work features close to the work piece. Finally, it must be calculated and adjusted, assembly or disassembly be standard fixture components required for the position, so that the work piece firmly by clamping fixture in China. In accordance with this procedure, the outline fixture structure and equipped with the planning and recording process can be automated control.
Structural modeling task is to produce some stable flat combination, Thus, these plane of the work pieces clamping force and will fixture stability. According to usual practice, this task can be human-machine dialogue that is almost completely automated way to completion. A man-machine dialogue that is automated fixture structure modeling to determine the merits can be conducted in an organized and planning fixture design reduce the amount of the design, shortening the study period and better distribution of work conditions. In short, can be successfully achieved significantly improve fixture efficiency and effectiveness.
Fully prepared to structure programs and the number of material circumstances, the completion of the first successful assembly can save up to 60% of the time.
Therefore fixture process modeling agencies is the purpose of the program has appropriate documents.
The current national standard parts and components of the existing fixture in China: GB/T2148~T2259 - 91 and all kinds of general fixture fixture standard, etc.. The fixture is conducive to the standardization of commercial production fixture, shorten production preparation period and reduce the total cost of production. 2, precision: with precision mechanical products is increasing, will increase the accuracy requirements of the fixture. 3, efficiency: efficient fixture is mainly used to reduce the processing time and auxiliary time, to improve labor productivity, reduce labor intensity recognized.. Efficient common clip has high-speed automated fixture fixture and fixture device with clamping force. At present, in addition to the production line, automatic line configuration corresponding efficient automated fixtures and, in CNC machine tools, especially on the machining center appeared a variety of automatic clamping fixture and jig automatic replacement device, give full play to the efficiency of NC machine tool. 4, flexible, flexible and flexible machine tool fixture is similar, it refers to the fixture by adjusting the combination, etc., in order to adapt to the capability of the process variable factors. The new type of fixture with flexible features are: combination fixture, universal adjustable fixture, fixture, modular fixture, NC fixture etc.. In order to meet the needs of modern mechanical industry, many varieties, small batch production, expand the fixture flexible degree of change of special fixture for non detachable structure, the development of adjustable clamp, and will be the main direction of the current fixture development in [7]. In summary, fixture in mechanical machining process plays an important role, the development of fixture is in order to meet the needs of modern machinery processing technology, it can be said is the needs of social development, production drives the development of fixture, the development process is inevitable.
機械加工及其夾具設(shè)計
機械加工是所有制造過程中最普遍使用的而且是最重要的方法。機械加工過程是一個產(chǎn)生形狀的過程,在這過程中,驅(qū)動裝置使工件上的一些材料以切屑的形式被去除。盡管在某些場合,工件無承受情況下,使用移動式裝備來實現(xiàn)加工,但大多數(shù)的機械加工是通過既支承工件又支承刀具的裝備來完成。
機械加工方法大致有以下幾種情況:
(1)用車、銑、刨、鉆、磨等通用機床加工零件,然后進行必要的鉗工修配,裝配成各種組合零件。
(2)精度要求高的零件,只用普通機床加工難以保證高的加工精度,因而需要采用精密機床進行加工。
(3)為了使零件特別是形狀復(fù)雜的凸模、凹模型孔和型腔的加工更趨自動化,減少鉗工修配的工作量,需采用數(shù)控機床(如三坐標數(shù)控銑床、加工中心、數(shù)控磨床等設(shè)備)加工零件。
機械加工過程中具備兩方面。小批生產(chǎn)低費用。對于鑄造、鍛造和壓力加工,每一個要生產(chǎn)的具體工件形狀,即使是一個零件,幾乎都要花費高額的加工費用??亢附觼懋a(chǎn)生的結(jié)構(gòu)形狀,在很大程度上取決于有效的原材料的形式。一般來說,通過利用貴重設(shè)備而又無需特種加工條件下,幾乎可以以任何種類原材料開始,借助機械加工把原材料加工成任意所需要的結(jié)構(gòu)形狀,只要外部尺寸足夠大,那都是可能的。因此對于生產(chǎn)一個零件,甚至當零件結(jié)構(gòu)及要生產(chǎn)的批量大小上按原來都適于用鑄造、鍛造或者壓力加工來生產(chǎn)的,但通常寧可選擇機械加工。
嚴密的精度和良好的表面粗糙度,機械加工的第二方面用途是建立在高精度和可能的表面粗糙度基礎(chǔ)上。許多零件,如果用別的其他方法來生產(chǎn)屬于大批量生產(chǎn)的話,那么在機械加工中則是屬于低公差且又能滿足要求的小批量生產(chǎn)了。另一方面,許多零件靠比較粗糙的生產(chǎn)加工工藝制造其表面形狀,而僅僅是在需要高精度的且選擇過的表面才進行機械加工。例如內(nèi)螺紋,除了機械加工之外,幾乎沒有別的加工方法能進行加工。又如已鍛工件上的小孔加工,也是被鍛后緊接著進行機械加工才完成的。
機械加工中最主要的是高速切削加工。 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??梢哉f,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(dǎo)自然頻率(Dominant Natural Frequency)時,可認為是高速切削??梢姼咚偾邢骷庸な且粋€綜合的概念。
1992年,德國Darmstadt工業(yè)大學(xué)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。
機械加工工藝是制造技術(shù)的靈魂、核心和關(guān)鍵,是生產(chǎn)中最活躍的因素。其過程是采用金屬切削刀具或磨具及其他加工方法來加工工件,使工件達到所要求的形狀、尺寸、表面粗糙度和力學(xué)物理性能,從而生產(chǎn)成為合格零件。而機械加工工藝規(guī)程是規(guī)定產(chǎn)品或零件機械加工工藝過程和操作方法等的工藝文件,是一切有關(guān)生產(chǎn)人員都應(yīng)嚴格執(zhí)行、認真貫徹的紀律性文件[8]。機床夾具是機床上裝夾工件的一種裝置,其作用是使工件相對于機床和刀具有一個正確的位置,并在加工過程中保持這個位置不變。使用夾具可以有效的保證加工質(zhì)量,提高生產(chǎn)效率,降低生產(chǎn)成本,擴大機床的工藝范圍,減輕工人勞動強度,保證安全生產(chǎn)等,因此,夾具在機械制造中占有重要的地位[10]??紤]到機械加工工藝安排及夾具的使用在泵體的生產(chǎn)中直接影響到其加工質(zhì)量和生產(chǎn)效率等,所以研究泵體的機械加工工藝及夾具設(shè)計的課題有著十分重要的意義。
自動夾具設(shè)計
用做裝配設(shè)備的傳統(tǒng)同步夾具把零件移動到夾具中心上,以確保零件從傳送機上或從設(shè)備盤上取出后置于已定位置上。然而在某些應(yīng)用場合、強制零件移動到中心線上時,可能引起零件或設(shè)備破壞。當零件易損壞而且小小振動可能導(dǎo)致報廢時,或當其位置是由機床主軸或模具來具體時,再或者當公差要求很精密時,那寧可讓夾具去適應(yīng)零件位置,而不是相反。為著這些工作任務(wù),美國俄亥俄州Elyria的Zaytran公司已經(jīng)開發(fā)了一般性功能數(shù)據(jù)的非同步西類柔順性夾具。因為夾具作用力和同步化裝置是各自獨立的,該同步裝置可以用精密的滑移裝置來替換而不影響夾具作用力。夾具規(guī)格范圍是從0.2英寸行程,5英鎊夾緊力到6英寸行程、400英寸夾緊力。
現(xiàn)代生產(chǎn)的特征是批量變得越來越小而產(chǎn)品的各種規(guī)格變化最大。因此,生產(chǎn)的最后階段,裝配因生產(chǎn)計劃、批量和產(chǎn)品設(shè)計的變更而顯得特別脆弱。這種情形正迫使許多公司更多地致力于廣泛的合理化改革和前面提到過情況那樣裝配自動化。盡管柔性夾具的發(fā)展很快落后與柔性運輸處理裝置的發(fā)展,如落后于工業(yè)機器人的發(fā)展,但仍然試圖指望增加夾具的柔順性。事實上夾具的重要的裝置——生產(chǎn)裝置的專向投資就加強了使夾具更加柔性化在經(jīng)濟上的支持。
根據(jù)它們?nèi)犴樞?,夾具可以分為:專用夾具、組合夾具、標準夾具、高柔性夾具。柔性夾具是以它們對不同工件的高適應(yīng)性和以少更換低費用為特征的。
結(jié)構(gòu)形式可變換的柔性夾具裝有可變更結(jié)構(gòu)排列的零件(例如針形頰板,多片式零件和片狀頰板),標準工件的非專用夾持或夾緊元件(例如:啟動標準夾持夾具和帶有可移動元件的夾具配套件),或者裝有陶瓷或硬化了的中介物質(zhì)(如:流動粒子床夾具和熱夾具緊夾具)。為了生產(chǎn),零件要在夾具中被緊固,需要產(chǎn)生夾緊作用,其有幾個與夾具柔順性無關(guān)的步驟:
根據(jù)被加工工件基礎(chǔ)的部分和工作特點,確定工件在夾具中的所需的位置,接著必須選擇若干穩(wěn)定平面的組合,這些穩(wěn)定平面就構(gòu)成工件被固定在夾具中確定位置上的夾具上,均衡所有的力和力矩,而且保證接近工件工作特點。最后,必須計算、調(diào)整、組裝可拆裝的或標準夾具元件的所需位置,以便使工件牢牢地被夾緊在夾具中。依據(jù)這樣的程序,夾具的輪廓結(jié)構(gòu)和裝合的規(guī)劃和記錄過程可以進行自動化控制。
結(jié)構(gòu)造型任務(wù)就是要產(chǎn)生若干穩(wěn)定平面的組合,這樣在這些平面上的各夾緊力將使工件和夾具穩(wěn)定。按慣例,這個任務(wù)可用人—機對話即幾乎完全自動化的方式來完成。一人—機對話即以自動化方式確定夾具結(jié)構(gòu)造型的優(yōu)點是可以有組織有規(guī)劃進行夾具設(shè)計,減少所需的設(shè)計人員,縮短研究周期和能更好地配置工作條件。簡言之,可成功地達到顯著提高夾具生產(chǎn)效率和效益。
在充分準備了構(gòu)造方案和一批材料情況下,在完成首次組裝可以成功實現(xiàn)節(jié)約時間達60%。
因此夾具機構(gòu)造型過程的目的是產(chǎn)生合適的編程文件。
目前我國已有夾具零件及部件的國家標準:GB/T2148~T2259—91以及各類通用夾具、組合夾具標準等。機床夾具的標準化有利于夾具的商品化生產(chǎn),有利于縮短生產(chǎn)準備周期,降低生產(chǎn)總成本。2、精密化:隨著機械產(chǎn)品精度的日益提高,勢必相應(yīng)提高了對夾具的精度要求。3、高效化:高效化夾具主要用來減少工件加工的基本時間和輔助時間,以提高勞動生產(chǎn)率,減輕公認的勞動強度。。常見的高效化夾具有自動化夾具、高速化夾具和具有夾緊力裝置的夾具等。目前,除了在生產(chǎn)流水線、自動線配置相應(yīng)的高效、自動化夾具外,在數(shù)控機床上,尤其是在加工中心上出現(xiàn)了各種自動裝夾工件的夾具以及自動更換夾具的裝置,充分發(fā)揮了數(shù)控機床的效率。4、柔性化:機床夾具的柔性化與機床的柔性化相似,它是指機床夾具通過調(diào)整、組合等方式,以適應(yīng)工藝可變因素的能力。具有柔性化特征的新型夾具種類主要有:組合夾具、通用可調(diào)夾具、成組夾具、模塊化夾具、數(shù)控夾具等。為適應(yīng)現(xiàn)代機械工業(yè)多品種、中小批量生產(chǎn)的需要,擴大夾具的柔性化程度,改變專用夾具的不可拆結(jié)構(gòu),發(fā)展可調(diào)夾具,將是當前夾具發(fā)展的主要方向[7]。 綜上所述,夾具在機械加工生產(chǎn)過程中起著重大的作用,夾具的發(fā)展是為了滿足當代機械加工工藝的需要,可以說是社會發(fā)展、生產(chǎn)的需要帶動著夾具的發(fā)展,其發(fā)展過程是必然的。論如何提高機械加工精度
加工精度是指零件加工后的實際幾何參數(shù)(尺寸、形狀和位置)……