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附 錄1
開環(huán)系統(tǒng)的優(yōu)點(diǎn)是系統(tǒng)簡(jiǎn)單、成本低，但缺點(diǎn)是精度不高。反向間隙、絲杠螺距誤差、起停誤差等都會(huì)影響定位精度。下面幾種改進(jìn)措施可以使定位精度明顯改善。
1 反向間隙誤差補(bǔ)償
數(shù)控機(jī)床加工刀具與工件的相對(duì)運(yùn)動(dòng)是依靠驅(qū)動(dòng)裝置帶動(dòng)齒輪、絲杠轉(zhuǎn)動(dòng)，從而推動(dòng)工作臺(tái)面等移動(dòng)部件產(chǎn)生位移來實(shí)現(xiàn)的。作為傳統(tǒng)元件的齒輪、絲杠盡管制造精度很高，但總免不了存在間隙。由于這種間隙存在，當(dāng)運(yùn)動(dòng)的方向改變時(shí)，開始段時(shí)間必然會(huì)引起驅(qū)動(dòng)元件的空走，出現(xiàn)指令脈沖推不動(dòng)執(zhí)行元件的局面。這就影響了機(jī)床的加工精度，即指令脈沖與實(shí)際進(jìn)給步數(shù)不相符合，產(chǎn)生加工誤差 因此，開環(huán)數(shù)控系統(tǒng)一般都設(shè)置有反向間隙誤差補(bǔ)償功能，用以補(bǔ)足空走的步數(shù)反向間隙差補(bǔ)償就是首先實(shí)測(cè)反向進(jìn)給的誤差，把它折算成脈沖當(dāng)量數(shù)，作為間隙補(bǔ)償子程序的輸出量，當(dāng)計(jì)算機(jī)判斷出現(xiàn)的指令為反向運(yùn)動(dòng)時(shí)，隨即調(diào)用間隙補(bǔ)償子程序，通過輸出補(bǔ)償脈沖消除反向間隙后再進(jìn)行正常的插補(bǔ)運(yùn)行。
2 常值系統(tǒng)性定位誤差補(bǔ)償
類庫(kù)以供設(shè)計(jì)者調(diào)用。這樣在零件的設(shè)計(jì)階段，設(shè)計(jì)者只需輸入特征的參數(shù)，系統(tǒng)直接生成特征的實(shí)例模型：在數(shù)據(jù)庫(kù)中我們必須存儲(chǔ)相關(guān)的特征類的結(jié)構(gòu)信息，數(shù)據(jù)庫(kù)表集就是用于存儲(chǔ)這一部分的相關(guān)信息。根據(jù)特征類型定義的需要，我們定義了特征類編碼表、特征類版本信息表表示特征類型；定義了特征類構(gòu)造表表達(dá)特征類的結(jié)構(gòu)；并通過零件特征配置表與零件的特征層信息聯(lián)系起來。特征層數(shù)據(jù)表集是本零件模型數(shù)據(jù)庫(kù)設(shè)計(jì)的核心，記錄了特征實(shí)例模型的設(shè)計(jì)、工藝等信息。特征構(gòu)造表記錄了特征的幾何結(jié)構(gòu)；特征尺寸表、特征形位公差表、特征表面粗糙度表記錄了特征的工程語(yǔ)義引用；尺寸表、形位公差表、表面粗糙度表存儲(chǔ)了所有零件特征的數(shù)據(jù)信息。在特征層，利用特征ID、幾何要素ID、尺寸ID、公差I(lǐng)D、粗糙度ID等主鍵進(jìn)行數(shù)據(jù)檢索。我們將該零件信息模型的數(shù)據(jù)庫(kù)應(yīng)用于工廠環(huán)境下某型組件的CAD AM 集成系統(tǒng)中，較好地實(shí)現(xiàn)了CAD與CAPP的特征信息共享。在該系統(tǒng)中主要使用現(xiàn)成的CAD／CAM 軟件(Unigraphics 1I)進(jìn)行產(chǎn)品設(shè)計(jì)和NC編程，并通過對(duì)該軟件進(jìn)行二次開發(fā)獲取零件的尺寸信息；同時(shí)利用自行開發(fā)的對(duì)話窗體，讓設(shè)計(jì)人員交互輸入其它特征信息，實(shí)現(xiàn)該軟件與系統(tǒng)的共享數(shù)據(jù)庫(kù)的連接。在輔助工藝設(shè)計(jì)時(shí)，工藝設(shè)計(jì)人員通過程序的查詢功能，從共享數(shù)據(jù)庫(kù)中查詢所需的零件信息，進(jìn)行交互工藝設(shè)計(jì)。從而方便了CAPP的零件信息獲取，提高了工藝設(shè)計(jì)的效率。在利用UG進(jìn)行NC編程時(shí)，可以從共享數(shù)據(jù)庫(kù)中獲取所需的工藝及制造信息，進(jìn)行各工序的刀軌設(shè)計(jì)與加工仿真在數(shù)控機(jī)床上建立一個(gè)絕對(duì)零點(diǎn)，實(shí)測(cè)出各坐標(biāo)軸相對(duì)點(diǎn)的全部定位誤差，做出曲線以便確定補(bǔ)償點(diǎn)。圖l所示是一個(gè)實(shí)測(cè)的定位誤差曲線，把這個(gè)曲線的縱坐標(biāo)(誤差)以脈沖當(dāng)量為單位進(jìn)行分割，作出橫線，每個(gè)橫線與曲線的交點(diǎn)即為目標(biāo)補(bǔ)償點(diǎn)。圖1中的1到6點(diǎn)處的定位誤差為正，需要作減脈沖補(bǔ)償；而6至9處需要進(jìn)行加脈沖補(bǔ)償圖中陰影部分為補(bǔ)償區(qū)。把這些補(bǔ)償點(diǎn)列成誤差.修正表存入計(jì)算機(jī)，當(dāng)工作臺(tái)由零點(diǎn)位置移動(dòng)時(shí)，安裝在絕對(duì)原點(diǎn)處的微動(dòng)開關(guān)發(fā)出絕對(duì)原點(diǎn)定位信號(hào)，以后計(jì)算機(jī)將隨時(shí)發(fā)出目標(biāo)補(bǔ)償點(diǎn)的補(bǔ)償信號(hào)，對(duì)機(jī)床進(jìn)行定位誤差補(bǔ)償。
3 反饋補(bǔ)償開環(huán)控制
該系統(tǒng)由開環(huán)控制和感應(yīng)同步器直接位置測(cè)量?jī)蓚€(gè)部分組成。這里的位置檢測(cè)不用作位置的反饋，而是作為位置誤差的補(bǔ)償反饋。其基本的原理是：由機(jī)床數(shù)控裝置CNC發(fā)出的指令脈沖，一方面供給開環(huán)系統(tǒng)，控制步進(jìn)電機(jī)按指令運(yùn)轉(zhuǎn)，并直接驅(qū)動(dòng)機(jī)床工作臺(tái)移動(dòng)，構(gòu)成開環(huán)控制；另一方面該指令脈沖又供給感應(yīng)同步器的測(cè)量系統(tǒng)(即數(shù)字式正、余弦發(fā)生器)，作為位置給定信號(hào)。工作在鑒幅方式的感應(yīng)同步器此時(shí)既是位置檢測(cè)器，又是比較器，它把由正、余弦發(fā)生器給定的滑尺激磁信號(hào)傳送給步進(jìn)電機(jī)。
4 結(jié) 論
CIMS環(huán)境下基于特征的零件信息建模還是一門不斷發(fā)展的技術(shù)，怎樣提高特征設(shè)計(jì)所能完成的零件復(fù)雜度；如何使特征設(shè)計(jì)適應(yīng)特征識(shí)別、特征語(yǔ)義轉(zhuǎn)換的要求等問題還有待人們?nèi)ソ鉀Q。本文介紹了特征技術(shù)在零件信息建模中的應(yīng)用，重點(diǎn)描述該零件數(shù)據(jù)模型的數(shù)據(jù)庫(kù)實(shí)現(xiàn)；所建立的零件信息數(shù)據(jù)庫(kù)系統(tǒng)可以較好地滿足CIMS系統(tǒng)對(duì)性
附錄2
The open system merit of Computer Numerical Control
The open system merit is the system simple, the cost low, but the shortcoming is the precision is low. The reverse gap, the guide screw pitch error, stop inferiorly can affect the pointing accuracy by mistake. Following several kind of improvements measure may cause the pointing accuracy distinct improvement.
1. reverse gap error compensates
The numerical control engine bed processing cutting tool and the work piece relative motion is depends upon the drive impetus gear,the guide screw rotation, thus the impetus work floor and so on moves the part to produce moves realizes. As traditional part gear, guide screw although the manufacture precision is very high, but always unavoidably has the gap. As a result of this kind of gap existence, when movement direction change, starts the section time to be able to cause inevitably actuates the part wasting time, appears the instruction pulse to push the motionless functional element the aspect. This has affected the engine bed processing precision, namely the instruction pulse and actual enters for the step does not tally,has the processing error therefore, the split-ring numerical control system all establishes generally has the reverse gap error compensatory function, with by makes up which wastes time the step reverse gap difference compensates is first actual reverse enters for the error, converts the pulse equivalent number it, compensates the subroutine as the gap the output, when the computer judgment appears when instruction for counter motion, transfers the gap to compensate the subroutine immediately, compensates the pulse after the output to eliminate the reverse gap to carry on again normally inserts makes up the movement.
2. often the value systematic characteristic position error compensates
A kind of storehouse by transfers for the designer. Like this in the components design stage, the designer only must input the characteristic the parameter, the system direct production characteristic example model: We must save the related characteristic class in the database the structure information, the database table collection are use in saving this part of related information. According to the characteristic type definition need, we defined the characteristic class code table, the characteristic class edition information have outstanding shown the characteristic type; Defined the characteristic class structure outstanding to reach the characteristic class the structure; And relates through the components characteristic disposition table and the components characteristic level information. The characteristic level data sheet collection is this components model database design core, has recorded characteristic example information and so on model design, craft. The characteristic structure table has recorded the characteristic geometry structure; The characteristic size table, the characteristic shape position table of limits, the characteristic surface roughness table has recorded the characteristic project semantics quotation; The size table, the shape position table of limits, the surface roughness table saved all components characteristic data message. In the characteristic level, using characteristic ID, geometry principal linkage and so on essential factor ID, size ID, common difference ID, roughness ID carries on the data retrieval. We apply this components information model database under the factory environment some module CAD in the AM integrative system, has realized CAD and the CAPP characteristic information sharing well. Main use ready-made CAD/the CAM software (Unigra phics 1I) carries on the product design and the NC programming in this system, and through carries on two times of developments gains components to this software the size information; At the same time uses the dialogue window which develops voluntarily, lets design the personnel to input other characteristic information alternately, realizes this software and the system sharing database connection. When assistance technological design, the technological design personnel through the procedure inquiry function, inquires the components information from the sharing database which needs, carries on the interactive technological design. Thus has facilitated the CAPP components information acquisition, enhanced the technological design efficiency. When carries on the NC programming using UG, may from the sharing database gain the craft and the manufacture information which needs, carries on various working procedures the knife axle design and the processing simulation establishes an absolute zero spot on the numerical control engine bed, the actual various coordinate axes syzygy completely position error, makes the curve in order to determined compensates the spot. Attempts l to show is an actual position error curve, (error) carries on this curve y-coordinate take the pulse equivalent as the unit the division, makes the horizontal line, each horizontal line and the curve point of intersection namely compensates the spot for the goal. Chart 1 the center 1 to 6 o'clock place position errors for, needs to do reduces the pulse to compensate; But needs to carry on 6 to 9 adds the pulse to compensate in the chart the shadow partially for to compensate the area. Compensates the range of points these to become the error
The calibration corrections stores the computer, when work table by zero displacement in position, installs sends out the absolute zero point localization signal in the absolute zero point micros witch, later computer as necessary will send out the goal to compensate to compensate the signal, will carry on the position error to the engine bed to compensate. The cosine generator assigns slide guage initiation signal a electricity and by step of transmission.
3. feedbacks compensates the open-loop control
Chart 2 has produced this kind of system schematic diagram. This system surveys two parts by the open-loop control and the induction synchromesh direct position to be composed. Here position examination does not serve as the position the feedback, but is compensates the feedback as the position error. Its cardinal principle is: Installs the instruction pulse by the engine bed numerical control which CNC sends out, on the one hand the supplies open system, the control step-by-steps the electrical machinery according to the instruction revolution, and the direct drive platen moves, constitutes the open-loop control; On the other hand this instruction pulse supplies the induction synchromesh the measurement system (namely digitally, cosine generator), as position demand signal a by. The work in the warning way induction synchromesh this time not only is the position sensor, also is the comparator, it by, The cosine generator assigns slide guage initiation signal a electricity and by step of transmission.
4. conclusions
Under the CIMS environment the technology which develops unceasingly based on characteristic components information modeling, how enhances the components order of complexity which the characteristic design can complete; How causes question and so on request which the characteristic design adoption trick recognition, the characteristic semantics transforms also to wait for the people to solve. This article introduced the characteristic technology in the components information modeling application, describes this components data model database realization with emphasis; Establishes the components information database system may satisfy the CIMS system well to the letter.
Reference:
[1].Zhang Huashu under. parallel environment based on characteristic components definition model [J]. mechanical science with technology, 1,999, 18 (1): 14l 144.
[2].forest morning star, Du full text, Xu Jianxin. characteristic and (',M)/CAPP/CAM integrative system [J]. the computer-aided design and makes, 1998, 28 (5): 5155.
[3].Zeng Hui E, Zhou Qingzhong. studied J based on the characteristic mechanical product modelling ]. the machinery to suppose Counts with the manufacture [ the regulation, 1,999, 28 (2): 12 ~ l4.
學(xué)生實(shí)習(xí)報(bào)告
院（系）：機(jī)械工程學(xué)院 專業(yè)：機(jī)械設(shè)計(jì)制造及其自動(dòng)化 班級(jí)： 姓名：
一、 實(shí)習(xí)的主要內(nèi)容
2007年1月份開始,我在廣東的一個(gè)日資企業(yè)技術(shù)部實(shí)習(xí),主要從事注塑機(jī)周邊設(shè)備的設(shè)計(jì),主要有除濕干燥機(jī),模溫機(jī),粉碎機(jī)等系列產(chǎn)品,我們實(shí)習(xí)的主要內(nèi)容是：
1、參加由公司組織的理論知識(shí)的學(xué)習(xí)，由有經(jīng)驗(yàn)的領(lǐng)導(dǎo)、工程師授課，學(xué)習(xí)公司的文化、以及公司的發(fā)展前景、主要產(chǎn)品的生產(chǎn)流程和必要的技術(shù)要求以及一些改進(jìn)方向、公司必須保留和更新發(fā)展的技術(shù)核心等等。
2、 在公司,實(shí)習(xí)期間我主要完成了新款除濕機(jī)NS-25系列的機(jī)箱鈑金件的二維圖繪制和三維繪制,將零件裝配起來,完成一個(gè)實(shí)體圖,以便校核和模擬,同時(shí)繪制了NS-100系列的二維圖,并在設(shè)計(jì)過程中制作機(jī)器明細(xì)表等，所需零件全部準(zhǔn)備好之后,再行組裝。在組裝過程中進(jìn)一步了解到哪個(gè)零件是否合理,如果不合理怎么樣加以改進(jìn),使以后批量生產(chǎn)中不會(huì)出現(xiàn)同樣的錯(cuò)誤。
3、 熟悉了除濕干燥機(jī)的工作原理,并對(duì)新開發(fā)的除濕機(jī)做彩頁(yè)說明,包括中英文對(duì)照,參數(shù)等的設(shè)定，為銷售作好前期工作。
4、對(duì)新機(jī)器制作網(wǎng)頁(yè)，因?yàn)榫W(wǎng)絡(luò)是一個(gè)最快速且先進(jìn)的交流工具，使客戶能夠第一時(shí)間了解我們公司的產(chǎn)品及開發(fā)進(jìn)程。
5、對(duì)機(jī)器上的每一個(gè)零件攝影，并且用PhotoShop對(duì)圖片進(jìn)行處理，完成了公司里面全部零件的處理工作。并且熟悉了PhotoShop軟件的應(yīng)用。
二、實(shí)習(xí)取得的經(jīng)驗(yàn)及收獲：
通過一段時(shí)間在公司的實(shí)習(xí)，使我受益匪淺。
1、首先讓自己對(duì)社會(huì)有了一定的了解，對(duì)公司的文化、產(chǎn)品有了一定的認(rèn)識(shí)，為自己在以后的人生路上做了一個(gè)很好的鋪墊，并逐步養(yǎng)成了吃苦耐勞的精神，培養(yǎng)了團(tuán)結(jié)一致的團(tuán)隊(duì)精神。
2、了解了一般公司要想發(fā)展所應(yīng)具備的基本要求，必須具備創(chuàng)新能力開發(fā)出新型的能夠符合市場(chǎng)競(jìng)爭(zhēng)需要的新產(chǎn)品，才能夠在市場(chǎng)競(jìng)爭(zhēng)中立于不敗之地。
3、通過這一段時(shí)間的實(shí)習(xí)，使我對(duì)學(xué)校里學(xué)的理論知識(shí)有了更深入的了解，并且能夠熟練應(yīng)用CAD，PROE ，PhotoShop等軟件，對(duì)辦公軟件也更加熟練。
4、經(jīng)過了這段實(shí)習(xí)生活后，加深鞏固了以前學(xué)校里學(xué)的知識(shí)，同時(shí)也了解到了以前學(xué)校里面學(xué)不到的東西，極大的拓寬了我的視野及知識(shí)面，為今后的正式工作生活奠定了一個(gè)良好的基礎(chǔ)。
三、 存在的不足及建議
通過實(shí)習(xí)我本人感覺到還有很多不足的地方：
a) 我們學(xué)習(xí)了四年的理論知識(shí)，初步了解了機(jī)械行業(yè)的基礎(chǔ)知識(shí)，但在實(shí)際生產(chǎn)中這些還是不夠的，“書到用時(shí)方恨少”真實(shí)的說明了這個(gè)道理。
b) 初到公司缺乏工作經(jīng)驗(yàn)，很多的工作感到無從下手，沒有一個(gè)完整的頭緒，很難單獨(dú)去接受一個(gè)實(shí)際的課題。
通過實(shí)習(xí)我想對(duì)學(xué)校一點(diǎn)建議：
1 學(xué)校是否考慮注重學(xué)生的實(shí)際動(dòng)手能力，加強(qiáng)學(xué)生的實(shí)踐能力的培養(yǎng)，如增加學(xué)生的在校實(shí)習(xí)的機(jī)會(huì)和延長(zhǎng)學(xué)生的實(shí)踐活動(dòng)的時(shí)間、更加注重在老師的指導(dǎo)下讓學(xué)生真正的參與到實(shí)踐中去。
2 畢業(yè)設(shè)計(jì)期間學(xué)校是否能考慮組織學(xué)生到生產(chǎn)現(xiàn)場(chǎng)去參觀實(shí)習(xí)，讓學(xué)生接 受最為直接的設(shè)計(jì)基本知識(shí)，比憑空去設(shè)想更有效果。
哈爾濱工業(yè)大學(xué)華德應(yīng)用技術(shù)學(xué)院
畢業(yè)設(shè)計(jì)（論文）
題 目 XK5040數(shù)控立式銑床結(jié)構(gòu)設(shè)計(jì)
專 業(yè) 機(jī)械制造及其自動(dòng)化
學(xué) 號(hào)
學(xué) 生
指 導(dǎo) 教 師
答 辯 日 期
哈工大華德學(xué)院
哈工大華德學(xué)院畢業(yè)設(shè)計(jì)（論文）評(píng)語(yǔ)
姓名： 學(xué)號(hào)： 專業(yè)：畢業(yè)設(shè)計(jì)（論文）題目：XK5040數(shù)控立式銑床結(jié)構(gòu)設(shè)計(jì)
工作起止日期： 2013 年 9 月 20 日起 2013 年 12 月 17 日止
指導(dǎo)教師對(duì)畢業(yè)設(shè)計(jì)（論文）進(jìn)行情況，完成質(zhì)量及評(píng)分意見：
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根據(jù)畢業(yè)設(shè)計(jì)（論文）的材料和學(xué)生的答辯情況，答辯委員會(huì)作出如下評(píng)定：
學(xué)生 畢業(yè)設(shè)計(jì)（論文）答辯成績(jī)?cè)u(píng)定為：
對(duì)畢業(yè)設(shè)計(jì)（論文）的特殊評(píng)語(yǔ)：
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答辯委員會(huì)委員（簽字）：___________ ___________ ___________ __________ __________ ___________ ___________ ___________ __________ __________ ___________ ___________ ___________ __________ __________
年 月 日
哈工大華德學(xué)院畢業(yè)設(shè)計(jì)（論文）任務(wù)書
姓 名： 院 （系）：專 業(yè)：機(jī) 械 制 造 及 其 自 動(dòng) 化 班 號(hào)： 任務(wù)起至日期： 2013 年 9 月 20 日至 2013 年 12 月 17 日
畢業(yè)設(shè)計(jì)（論文）題目： XK5040數(shù)控立式銑床結(jié)構(gòu)設(shè)計(jì)
立題的目的和意義：
數(shù)控機(jī)床是一種加工效率高、集成度高、用途廣泛的機(jī)床，現(xiàn)已廣泛應(yīng)用于各個(gè)領(lǐng)域，對(duì)數(shù)控機(jī)床研究成為現(xiàn)代機(jī)床設(shè)計(jì)重要課題。銑床主要是利用刀具的旋轉(zhuǎn)將工件表面多余的部分一層一層的切削而除去，從而形成具有一定尺寸，形狀和精度的工件。在一般的生產(chǎn)體系中，銑床的加工范圍占整個(gè)機(jī)器生產(chǎn)的重要部分，所以對(duì)數(shù)控銑床的結(jié)構(gòu)設(shè)計(jì)具有很重要的意義。
技術(shù)要求與主要內(nèi)容：
分析XK5040數(shù)控立式銑床的加工特點(diǎn)，確定新設(shè)計(jì)數(shù)控立式銑床的主要技術(shù)參數(shù)；
進(jìn)行數(shù)控立式銑床的總體方案設(shè)計(jì)；
進(jìn)行主運(yùn)動(dòng)和進(jìn)給的機(jī)械結(jié)構(gòu)設(shè)計(jì)。
進(jìn)度安排：
1. 9月10日 畢業(yè)設(shè)計(jì)動(dòng)員導(dǎo)師與學(xué)生見面，下達(dá)設(shè)計(jì)任務(wù)書 J103
2. 9月20日 開題 T207，T205，T204，T201，Q209
3. 11月5日 中期檢查 T204.T201.T206
4. 12月5日 結(jié)題驗(yàn)收 T204.T201.T206
5. 12月15日 上交論文 Q209
6. 12月17日～12月18日 導(dǎo)師交叉批閱論文 T204
7. 12月19、20日 答辯委員會(huì)分組答辯 Q209，T207，T205.T204.T201各組同時(shí)進(jìn)行
同組設(shè)計(jì)者及分工：
獨(dú)立完成
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系（教研室）主任意見：
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