【正文】
processing. In the article introducedthe work piece in clamps the concrete center the locate mode, locatesthe part and the detent mechanism choice, and clamps the anizationthe choice and the design. The modern high efficiency jig mostly usesmobile clamps, divides according to the strength source has airoperated, the hydraulic pressure, the gas fluid union, the electricitytransmission and so on carries on using the engine bed movement to thework piece clamps. These ways have clamp the movement quickly, clampsthe strength to be stable, may reduce merit and so on worker laborintensity. This design selects the power unit which the electric motorachievement clamps, the utilization mechanical and electricaltransmission control loop control motor the reverse, is processed inorder to the control the work piece in to clamp concrete on addition, in the article has also carried on the simple precisionanalysis and the putation to the jig. On the machine parts often all has each kind of different use and thedifferent precision hole needs to process. In the machinefinishing,the hole process load accounts for the proportion to be bigger, drillbit, Expanding drilling, Reamer and so on decides the size cutting toolprocessing to occupy quite most. By now, besides had to guarantee thehole the size precision, but also had to achieve the hole the positionprecision request. In the single unit small volume production, afterdraws a line adjusts the hole spool thread position method processing,because the drill bit rigidity bad, is easier to distort, thereforethe production efficiency low also the precision is bad. Generally alluses the drilling machine jig in the volume production, the drillingmachine jig calls 鉆模 , through drills the set of guidance cuttingtool to carry on the processing to be possible accurately to determinebetween the cutting tool and the work piece relative position, is 鉆模 main characteristic. Drills when truncates, is processed thehole the size and the precision mainly by the cutting tool itself sizeand the precision guaranteed。 But the hole position precision bydrills the set to be photogenic in the jig regarding locates the partthe position precision to determine. Because through drills the set ofguidance cutting tool to carry on the processing, this both possiblyenhances the cutting tool system rigidity, and can prevent the drillbit directs. Keywords : machinery, mon fixture, special fixture, drilling fixture, gear pumps, motors 第一章 引言 本課題研究意義 齒輪泵是在工業(yè)應(yīng)用中運(yùn)用極其廣泛的重要裝置之一,尤其是在液壓傳動(dòng)與控制技術(shù)中占有很大的比重,它具有結(jié)構(gòu)簡單、體積小、重量輕、自吸性能好、耐污染、使用可靠、壽命較長、制造容易、維修方便、價(jià)格便宜等特點(diǎn)〔 L一”。但同時(shí)齒輪泵也還存在一些不足,如困油現(xiàn)象比較嚴(yán)重、流量和壓力脈動(dòng)較大、徑向力不平衡、泄漏大、噪聲高及易產(chǎn)生氣穴等缺點(diǎn),這些特性和缺點(diǎn)都直接影響著齒輪泵的質(zhì)量。隨著齒輪泵在高溫、高壓、大排量、低流量脈動(dòng)、低噪音等方面發(fā)展及應(yīng)用,對(duì)齒輪泵 的特性研究及提高齒輪泵的安全和效率已成為國內(nèi)外深入研究的課題。 外嚙合齒輪泵是應(yīng)用最廣泛的一種齒輪泵 ( 稱為普通齒輪泵 ), 其設(shè)計(jì)及生產(chǎn)技術(shù)水平也最成熟。多采用三片式結(jié)構(gòu)、浮動(dòng)軸套軸向間隙自動(dòng)補(bǔ)償措施 , 并采用平槽以減小齒輪 ( 軸承 ) 的徑向不平衡力。目前 , 這種齒輪泵的額定壓力可達(dá) 25 MPa。但是 , 由于這種齒輪泵的齒數(shù)較少 , 導(dǎo)致其流量脈動(dòng)較大由于齒輪泵在液壓傳動(dòng)系統(tǒng)中應(yīng)用廣泛 , 因此 , 吸引了大量學(xué)者對(duì)其進(jìn)行研究。目前 ,國內(nèi)外學(xué)者關(guān)于齒輪泵的研究主要集中在以下方面 : 齒輪參數(shù)及泵體結(jié)構(gòu)的優(yōu)化設(shè)計(jì) ; 齒輪泵間隙優(yōu) 化及補(bǔ)償技術(shù) ; 困油沖擊及卸荷措施 ; 齒輪泵流量品質(zhì)研究 ; 齒輪泵的噪聲控制技術(shù) ; 輪齒表面涂覆技術(shù) ; 齒輪泵的變量方法研究 ;齒輪泵的壽命及其影響因素研究 ; 齒輪泵液壓力分析及其高壓化的途徑 ; 水介質(zhì)齒輪泵基礎(chǔ)理論研究 。綜上所知,對(duì)齒輪泵的自主研發(fā)和設(shè)計(jì)對(duì)我國尤為重要。特別是在提高其效力和降低噪音和振動(dòng)方面。 本次畢業(yè)設(shè)計(jì)的主要任務(wù)書是設(shè)計(jì): 設(shè)計(jì)外嚙合容積式齒輪泵, 適用于輸送不含固體顆粒和纖維 , 工作介質(zhì)軸承油: 220 smm/2 在輸油系統(tǒng)中可用作 傳輸、增壓泵、潤滑油泵。 齒輪泵的發(fā)展研究現(xiàn)狀 早在二千多年前,人類就發(fā)明了齒輪傳動(dòng)裝置。早期的齒輪采用木料或金屬鑄造成形,只能傳遞兩軸間的回轉(zhuǎn)運(yùn)動(dòng),不能保證傳動(dòng)的平穩(wěn)性,承載能力也很小。隨著生產(chǎn)的發(fā)展,齒輪運(yùn)轉(zhuǎn)的平穩(wěn)性受到重視。 1674 年丹麥天文學(xué)家羅默首次提出用外擺線作齒廓曲線,以得到運(yùn)轉(zhuǎn)平穩(wěn)的齒輪。 18 世紀(jì)工業(yè)革命時(shí)期,齒輪技術(shù)得到高速發(fā)展,人們對(duì)齒輪進(jìn)行了大量的研究。 江蘇工業(yè)學(xué)院祝海林教授等人針對(duì)現(xiàn)有高粘度齒輪泵結(jié)構(gòu)單一、徑向力不平衡、軸承受力大造成磨損嚴(yán)重、流量及壓力脈動(dòng)大等問題 ,綜合行星傳動(dòng)及齒輪泵原理,提出了將外嚙合與內(nèi)嚙合兩種結(jié)構(gòu)相結(jié)合構(gòu)成高粘度復(fù)合齒輪泵的設(shè)想,闡述了新型齒輪泵的結(jié)構(gòu)及性能特點(diǎn),得出了理論排量的計(jì)算公式。研究表明 :新型齒輪泵的高低壓腔對(duì)稱、齒輪與軸受力平衡。它具有內(nèi)泄漏小、軸承及泵的壽命長、輸出排量成倍增加而流量脈動(dòng)小等顯著優(yōu)點(diǎn),具有良好的產(chǎn)業(yè)化前景。 齒輪泵可分為外嚙合和內(nèi)嚙合兩大類,國外某些工業(yè)發(fā)達(dá)國家齒輪泵的產(chǎn)量在液壓泵中占有很大比重與外嚙合齒輪泵相比內(nèi)嚙合齒輪泵以其體積小,重量輕、噪聲低、自吸性能好、流量脈動(dòng)小等優(yōu)點(diǎn)而倍受重視,其產(chǎn)量在齒輪泵的總產(chǎn)量 中占有很大比例。一些發(fā)達(dá)國家內(nèi)嚙合與外嚙合齒輪泵的產(chǎn)量比接近于 1:1。齒輪泵是我國最早生產(chǎn)的液壓元件之一,壓力從 至 25Mpa(最高壓力達(dá)到 ),流量從 3Umin 至 4OOL/min 的齒輪泵均有生產(chǎn) 。我國的內(nèi)嚙合齒輪泵產(chǎn)量不大,特別是內(nèi)嚙合擺線齒輪泵和其它非漸開線齒廓嚙合齒輪泵,基本還處于初級(jí)階段。目前,我國的齒輪泵產(chǎn)品性能還比較