畢業(yè)論文外文譯文組合機床動力滑臺液壓系統(tǒng)常見故障的分析與排除

1、 畢業(yè)論文（設(shè)計）外文譯文題 目 組合機床動力滑臺液壓系統(tǒng)常見故障的分析與排除學(xué) 院 機械工程學(xué)院 專 業(yè) 機械設(shè)計制造及其自動化 年級 2012級 組合機床動力滑臺液壓系統(tǒng)常見故障的分析與排除摘要：動力滑臺是組合機床液壓裝置的一部分。然而，組合機床動力滑臺運行很長一段時間后，經(jīng)常會遇到“沒有工作進(jìn)給”的故障。在維護(hù)實踐經(jīng)驗的基礎(chǔ)上，本文提出的方法來排除故障。關(guān)鍵詞：組合機床 液壓系統(tǒng) 故障分析 故障排除組合機床是由通用部件和部分專用部件組成的高效、專用、自動化程度高的機床，可以完成鉆、擴(kuò)、鉸、鏜、銑和攻絲等加工以及完成各種復(fù)雜進(jìn)給工作循環(huán)。根據(jù)加工工藝要求，可在滑臺臺面上裝置動力箱、多軸箱及

2、各種專用切削頭等動力部件。液壓動力滑臺用液壓缸驅(qū)動，在運行很長一段時間后經(jīng)常遇到“沒有進(jìn)入測試”的現(xiàn)象。根據(jù)維修經(jīng)驗做法，筆者在本文結(jié)束提出排除故障的方法。1 yt4543動力滑臺液壓系統(tǒng)原理分析在機床的維護(hù)中，有必要首先分析工具機的液壓系統(tǒng)的原則yt4543在機床動力滑臺液壓系統(tǒng)的的液壓系統(tǒng)發(fā)生故障時的原則，示于圖1。圖1：yt4543動力滑臺液壓系統(tǒng)1.1快進(jìn)按下啟動按鈕，讓電磁鐵1ya收取電費和左框架閥電磁換向閥5到系統(tǒng)的訪問，控制油機液壓換向閥閥芯使閥門離開進(jìn)入系統(tǒng)工作?？梢员恢付橐韵碌目刂朴吐?。進(jìn)油路：單向變量泵2電磁換向閥5的左框架單向閥6換向閥4左腔;出口油路：左腔的液壓換向閥

3、4節(jié)流閥9電磁換向閥5的左框架石油盒;主油路如下：進(jìn)油路：單向變量泵2單向閥3液壓方向控制閥4的左側(cè)的右側(cè)的動作閥11液壓缸10的左腔室;清倉油路：液壓缸右腔10左側(cè)的液壓方向控制閥4單向閥17右側(cè)的動作閥11液壓缸10的左腔室。1.2 進(jìn)給當(dāng)滑動臺達(dá)到所需的位置，快進(jìn)，旅行鐵塊壓行程閥11，使左框架對系統(tǒng)的訪問，快進(jìn)油路切斷，但油只能進(jìn)入左腔通過速度控制閥16和兩位置兩通電磁閥，因為油通過液壓缸的后速度控制閥，可以使系統(tǒng)壓力高的液壓順序控制閥18打開，然后右腔室中的油在液壓缸的流量后，通過背壓閥19的回油。然后，可以實現(xiàn)滑動臺的第一工作進(jìn)給，其運動速度控制的速度控制閥16。由于在系統(tǒng)中的壓力

4、上升的limitedpressure可變?nèi)~片泵2的流速是自動降低，以免符合要求的工作進(jìn)給。油路可以具體描述如下：進(jìn)油路：變量泵2單向閥3換向閥4的左框架速度控制閥16電磁閥14液壓缸左腔10出口油路：液壓缸10的右腔換向閥4順序閥背壓閥1819油盒的左框架。1.3進(jìn)給“我的工作進(jìn)給之后”結(jié)束，旅行熨斗停止按壓電動行駛開關(guān)和發(fā)送的信號，使電磁閥14的電磁鐵3ya帶電，然后在左框架的閥訪問的斷油線的系統(tǒng)和cuta的，但油只能通過速度控制閥15后，流入液壓缸10的左腔室?，F(xiàn)在，滑臺轉(zhuǎn)換成“第二頻道”，它的運動速度是由速度控制閥15的，但只能比“我的工作進(jìn)給”的小范圍內(nèi)調(diào)節(jié)，但其他部分的入口油路，以及

5、出口油路是相同的“我的工作進(jìn)給”。1.4留死擋鐵“第二頻道”的速度移動到目的地時，滑臺會遇到死鐵停止和停止移動。然而，現(xiàn)在，液壓泵2的壓力油繼續(xù)流入液壓泵2 ，使油在系統(tǒng)中的壓力進(jìn)一步增加，當(dāng)油的壓力是相等的壓力繼電器13的穩(wěn)定的壓力，壓力繼電器動作的發(fā)送信號的時間繼電器;下一運動前的停留時間是由控制時間繼電器，處理部件的端面，在目前情況下，油的泵的輸送量是非常小的，這是唯一用于彌補泄漏，在系統(tǒng)運行時的壓力維持狀態(tài)。1.5快速反轉(zhuǎn)在滑動臺停留在上死鐵停止了一段時間后，時間繼電器發(fā)出一個信號，讓電磁鐵1ya斷電，但2ya電源，然后兩個方向控制閥5和4接入到系統(tǒng)中的正確的幀的實現(xiàn)的反相。油進(jìn)入液壓

6、缸10的右腔，使滑動臺倒置迅速。因為它是一個空載時，滑動臺是反相時，油系統(tǒng)中的壓力較低，和限壓型單向變量泵2的流量被自動放大到最大，有效面積之間的比例為2:1的液壓缸無桿腔和無桿腔，所以滑臺以相同的速度迅速反轉(zhuǎn)快進(jìn)。當(dāng)滑動臺迅速反轉(zhuǎn)快進(jìn)終止，在行走閥11被松開，而回油是平滑的?？刂朴吐房梢悦枋鋈缦拢哼M(jìn)油路：變量泵22單向閥7換向閥右方向閥室2的右側(cè)框架中;出口油路：的左腔方向閥48節(jié)流閥換向閥右腔5油盒主油路中，如下所示：進(jìn)油路：變量泵2單向閥3換向閥4右室右腔的液壓缸10出口油路：液壓缸10單向閥換向閥12右室右框架4油盒1.6快退原位停止當(dāng)滑動表中迅速反轉(zhuǎn)到原位，鐵停止按壓終止行程開關(guān)和發(fā)

7、送一個信號，使電磁鐵1ya，2ya和3ya斷電的，然后電磁換向閥5和液壓方向控制閥4的中央框架，和液壓缸的左，右腔室的油線被切斷，然后液壓缸在夾緊狀態(tài)下，滑動臺停止工作。到現(xiàn)在為止，油流入到回油框中，然后由可變泵2的流量不一定要通過單向泵3和4，然后在系統(tǒng)處于卸荷狀態(tài)。2分析“沒有工作飼料”faultof動力滑臺和拆卸步驟2.1故障原因分析組合機床動力滑臺在保持以正常速度在快速進(jìn)給，并來停止在初加工?；诟鞣N液壓元件的原則，對所學(xué)的知識和維護(hù)工作經(jīng)驗，并通過一個詳盡的分析，導(dǎo)致“沒有工作飼料”故障的主要原因可能是強大的切割，系統(tǒng)壓力不足，漏電無油供給液壓泵輸油量不足，耐磨損的液壓閥的內(nèi)部組件，

8、虛線或鎖定，或磨損，導(dǎo)致內(nèi)漏的液壓缸的內(nèi)部元件或密封元件圓筒壁內(nèi)的擠壓，以喚起越來越大的阻力，執(zhí)行元件等。2.2故障排除步驟由于液壓系統(tǒng)的氣密性，是液壓故障不直觀的機械故障，故障測量電動問題不是很方便，是真的不安直接判斷的。這是非常難以修復(fù)如檢查是液壓站開始，沒有理由不僅會被發(fā)現(xiàn)，但也某些組件將盲目拆卸，因此，新的故障將導(dǎo)致搜索的原因。為了液壓故障具有效率高，是建立一個合理的故障檢測序列每個故障原因的可能性，液壓元件或部件的拆卸和安裝容易。也就是說，序列是“按照先在壓力表的故障檢查的大方向，然后拆解石油管檢查故障（egthe內(nèi)部泄漏液壓泵和液壓缸，或爬行的滑動，表），然后恒等式的真正的液壓閥故

9、障。首先，工作進(jìn)給的切斷力進(jìn)行檢測：通過檢查的液壓系統(tǒng)中的壓力的米數(shù)，可以確認(rèn)的工作進(jìn)給的切斷力是否超過正常壓力的泵或不和產(chǎn)生的噪聲從切削有無異?；虿惶幚?。表示切削力過大，如果出現(xiàn)異常。由于限壓變量葉片泵的使用，如圖2中所示的在多數(shù)組合機床，“大的發(fā)貨量和低壓力的快進(jìn)，發(fā)貨量小，高壓力的工作進(jìn)給”的需要，可滿足自然，和液壓系統(tǒng)的工作進(jìn)給切削力的增加，隨著壓力升高。反饋液壓油的作用下，柱塞5驅(qū)動定子3的向左移動，直到定子提供什么，是與該轉(zhuǎn)子同心，從而不存在壓力油的進(jìn)油口線的滑動表停止工作。這種類型的問題的原因主要包括切削工具的磨損，清晰度不足，不一致的組件材料，現(xiàn)有的硬點，尤其是多發(fā)性混合硬點的

10、毛坯。故障排除方法，包括“檢查和更換高品質(zhì)的切削刀具，檢驗毛坯的硬度，提高毛坯的質(zhì)量”。圖2：限壓變量葉片泵的原理第二，可變?nèi)~片泵的供油是否正常與否進(jìn)行檢測。 （1）故障分析：組合機床滑臺的電源時，保持正常的速度在快速進(jìn)給，故障等原因，作為反向安裝的液壓泵的進(jìn)油口和出口，所述液壓泵的反相，相對的偏心方向的定子，葉片夾緊在凹槽中的葉片，過油的粘度高，導(dǎo)致柔性葉片運動，可以完全除去。但是，轉(zhuǎn)換成的工作饋送模型，系統(tǒng)的外部負(fù)載的增加以及滑動臺時，停止移動，并因此導(dǎo)致泵的出口壓力越來越高，和所述液壓泵遇到巨大的泄漏，由于內(nèi)部耐磨損的液壓泵，再不能出口的壓力油，因此，有沒有工作的飼料。 （2）故障的去除

11、方法：在液壓泵可以更換第一，然后為了下次方便，可以進(jìn)行維護(hù)。如果所有這些任務(wù)都試圖和內(nèi)部泄漏仍然過大，這是必要的，使用具有高粘度的液壓油，尤其是在夏天。第三，油盒被檢查，以查看它是否是上述的最低油位置，過濾器的油面以上時，油返回管高于油位，油過濾器阻塞的雜質(zhì)和污物，或不等。四，系統(tǒng)管，耦合和組件進(jìn)行檢查，看他們是否泄漏與否。第五，在液壓缸進(jìn)行檢查，以查看是否有一個內(nèi)部泄漏或過大的內(nèi)阻。 （1）故障分析：如果有一個在液壓缸內(nèi)壁上的局部加熱現(xiàn)象，它表示密封環(huán)老化或液壓缸的內(nèi)孔的磨損，導(dǎo)致液壓缸內(nèi)部泄漏和系統(tǒng)壓力無法建立，因此，工作進(jìn)給是無法實施的。如果高溫油，使活塞或活塞桿上的油封被密封在液壓缸歲

12、結(jié)束，變形，軟化，或壁球活塞和汽缸壁之間的密封環(huán)，活塞桿和端蓋產(chǎn)生孔，隨后巨大的摩擦力以抵消某些液壓壓力，因此不能應(yīng)對的工作進(jìn)給切削力，并且有沒有工作在滑動工作臺的進(jìn)給。 （2）故障排除方法：先在最后的位置讓滑臺停留，然后打開回油管，以檢查是否有油流（如果是這樣，有一個內(nèi)部的液壓缸泄漏）。接下來，觀察壓力計在快進(jìn)中的號碼，它表示在汽缸內(nèi)的電阻是非常大的，如果快進(jìn)的壓力高得多，也可以卸載，石油管的滑動表壓力板可以松開，可解除滑動臺（如果可以感覺到高的重量，可以證明在氣缸的內(nèi)部電阻會很大）?？梢钥隙ǖ拇_認(rèn)，如果這種情況下，有必要改變液壓缸的第一，然后展開液壓缸，檢查，修理或更換密封環(huán)和液壓缸機構(gòu)，

13、為了下次方便。六，液壓閥檢查。 （1）故障分析：由于液壓閥不能正常工作，由于閥芯夾緊的油污染，壓力油直接流入回油返回框，還有的是沒有壓力油在液壓缸的油入口，或反壓過高，由于回油不暢，從而將被強制為無法移動的液壓缸。 （2）的故障的去除方法可以被劃分成3步驟：第1步：檢查電動液壓方向閥：如果在主閥4和伺服閥5的操作手冊電動液壓方向閥的閥芯可以不被推向，它指示被夾緊線軸，它是必要的展開它們，然后使用重新組裝，可以替換舊的或新的閥門的閥體和閥芯必須清洗。如果方向控制閥可以改變和的滑動工作臺移動，它表明的電磁方向控制閥5的電力線遇到故障，因此，有必要首先檢查是否電源是或，在電磁線圈被打破由火災(zāi)或不是。

14、現(xiàn)在，認(rèn)真聽取噪聲的電磁線圈操作可以繼續(xù)進(jìn)行，發(fā)現(xiàn)存在的問題，并且，如果有一個問題，有必要改變在電磁線圈。否則，步驟2繼續(xù)進(jìn)行正常工作，如果電動液壓方向控制閥4和5。步驟2：檢查速度控制閥：手動速度控制閥15和16放大openmouths，如果在液壓缸的動作，它表明，在速度控制閥16和15被阻止，并且需要卸載它是清洗。否則，在速度控制閥16和15可以旋轉(zhuǎn)，直到松開。然后，步驟3中，可以進(jìn)行。第3步：請查看的順序閥和背壓閥：如果的手動順序閥18和的回壓閥19的閥芯有沒有任何動作，它表示，線軸被鉗位在關(guān)閉位置，所以油可以不通過和油線遇到相當(dāng)高的反壓，造成液壓缸造成無法動彈。這種情況下的主要的原因，

15、可能是太臟度的油，油過濾或更換。3結(jié)論在分析和切除故障的液壓系統(tǒng)的工作原理、結(jié)構(gòu)和功能的液壓元件和系統(tǒng)首先必須已知。在故障搜索，它是必要逐一檢查，直到發(fā)現(xiàn)的根本原因。此外，還有兩個方面的建議，強調(diào)在每一個可能的原因：（1）檢查是否遇到相關(guān)的電氣元件故障或不實施清除;（2）它是必要的，以確定是否有相關(guān)的外圍條件之前分析的關(guān)鍵部件正常與否。第一液壓泵和液壓缸的故障分析和刪除，然后分析的液壓閥的故障是必要的，因為液壓泵和液壓缸的故障進(jìn)行分析更容易，但需要很長一段時間以進(jìn)行修理。因此，為了減少維護(hù)時間，液壓泵和液壓缸的故障檢查，除去上面的第一，如果存在問題的，應(yīng)首先執(zhí)行它們的替代，然后它們的維護(hù)應(yīng)準(zhǔn)備

16、下一次。這種方法特別適用于生產(chǎn)線，因為有許多同類型的模塊化機床在生產(chǎn)線上用多個預(yù)留的液壓元件，快速的生產(chǎn)時間和機器停機時間短。因此，這種方法的應(yīng)用，不僅可以減少停機時間，提高工作效率和正確性，也可以緩解矛盾“大部分時間沒事做，但一個非常短的時間內(nèi)很忙”機械師最企業(yè)。參考文獻(xiàn)1劉彥君。液壓系統(tǒng)的使用和維護(hù)。北京：化學(xué)工業(yè)出版社，2006。2黃志堅，：吳百海。液壓設(shè)備故障診斷與維修案例精選。北京：化學(xué)工業(yè)出版社，2009。3張勤，徐鋼濤。液壓與氣壓傳動技術(shù)。北京：高等教育出版社，2009。analysis and removal of common faults of the hydraulic

17、system of power sliding table in modular machine toolzhongqin sunzaozhuang vocational college, zaozhuang, china, 277800abstract: the power sliding table is a general part of modular machine tool, and is driven by hydraulic device. however, the power sliding table frequently encounters the no working

18、 feedfault after the modular machine tool is running for a long time. based on the maintenance experience from practices, a method to remove the fault is proposed in this paper.keywords: modular machine tool, hydraulic system, fault analysis, fault removalthe modular machine tool features with high

19、efficiency,exclusive use and high automation, and is composed of general parts and some special parts, and also can fulfill the drilling, expanding, cutting off, boring, milling, tapping and other processing. also, the power sliding table is a general part of the modular machine tool, and is equippe

20、d with multiple rotating tools, and also is driven by the hydraulic device to complete the feed movement.however, the power sliding table frequently encounters he no entering task phenomenon after the modular machine tool is in the running for a long time. based on the maintenance experience from pr

21、actices, a method to remove the fault is proposed is concluded by the author in this paper.1 analysis on the principle of the hydraulic system of yt4543 power sliding tablein the maintenance of machine tool, it is necessary to firstly analyze the principle of the hydraulic system of the machine tool

22、 when the faults of hydraulic system happen.the principle of hydraulic system of the yt4543 power sliding table in the machine tool is shown in figure 1.figure 1: hydraulic system of the yt4543 power sliding table1.1 fast-forwardpress the start button to let the electromagnet 1ya of the solenoid dir

23、ectional valve 5 charged with electricity and the valve left frame accesses to the system; the control oil drives the spool of hydraulic directional valve 4 to let the valve left to access to the system to work. the control oil line can be specified as the following.inlet oil line: one-way variable

24、pump 2 the left frame of solenoid directional valve 5 one-way valve 6 the left chamber of hydraulic directional valve 4;outlet oil line: the left chamber of hydraulic directional valve 4throttling valve 9the left frame of solenoid directional valve 5 oil box;the main oil line is below:inlet oil line

25、: one-way variable pump 2one-way valve 3the left of hydraulic directional valve 4the right of motion valve 11the left chamber of hydraulic cylinder 10;outlet oil line: the right chamber of hydraulic cylinder 10the left of hydraulic directional valve 4one-way valve 17the right of motion valve 11the l

26、eft chamber of hydraulic cylinder 10;1.2 working feedwhen the sliding table reaches the desired location with fast-forward, the travel iron block presses the travel valve 11 to makes its left frame access to the system and cut off the fast-forward oil line, but the oil can only enter the left chambe

27、r of the hydraulic cylinder after passing through the speed control valve 16 and the two-position two-way solenoid valve, because the oil passing throughthe speed control valve can make the system pressure higher and the hydraulic sequence control valve 18 opened, and then the oil in the right chamb

28、er of the hydraulic cylinder flows back to the oil after passing through the back pressure valve 19. then, the sliding table can implement the first working feed, and its motion speed is controlled by the speed control valve 16. as the pressure in the system rises, the flow rate of the limitedpressu

29、re variable vane pump 2 is automatically lower soas to meet the requirements of the working feed. the oil line can be specifically described below:inlet oil line: variable pump 2one-way valve 3the left frame of hydraulic directional valve 4speed control valve 16solenoid valve 14the left chamber of h

30、ydraulic cylinder 10outlet oil line: the right chamber of hydraulic cylinder 10 the left frame of reversal valve 4sequence valve 18back pressure valve 19oil box1.3 working feedafter the i working feed comes to an end, the travel iron stop presses the electric travel switch and sends a signal to make

31、 the electromagnet 3ya of the solenoid valve 14 charged with electricity, and then the left frame of the valve accesses to the system and cuta off the oil line, but the oil can only flow into the left chamber of hydraulic cylinder 10 after passing through the speed control valve 15. now, the sliding

32、 table is converted into the “ii working feed, and its motion speed is controlled by the speed control valve 15, but can only be adjusted within the smaller scope than the i working feed. however, the other parts of the inlet oil line as well as the outlet oil line are identical to the i working fee

33、d.1.4 stay of the dead iron blockwhen moving to the travel destination at the speed of the “ii working feed, the sliding table will come across the dead iron stop and stop moving. however, by now, the hydraulic pump 2 continues to flow the pressure oil to hydraulic pump 2, and makes the oil pressure

34、 in the system increased further. when the oil pressure is equal to the settling pressure of the pressure relay 13, the pressure relay motion sends a signal to the time relay; the stay time before next motion is controlled by the time relay, to process the end face of the parts. under the present ci

35、rcumstances, the oil delivering amount of the pump is highly small, which is only used to make up the leakages,while the system is in the pressure-keeping state.1.5 fast reverseafter the sliding table stays at the dead iron stop for a while, the time relay sends a signal to let the electromagnet 1ya

36、 power off but the 2ya power on, and then the right frames of both the directional valves 5 and 4 access to the system to realize the inverting. the oil enters the right chamber of the hydraulic cylinder 10 and makes the sliding table invert speedily. as it is an idle load when the sliding table is

37、inverting, the oil pressure in the system is low, and the flow amount of the limited pressure type one-way variable pump 2 is automatically enlarged to the maximum, and the effective areas ratio between the rodless chamber and rod chamber of the hydraulic cylinder is 2:1, so the sliding table rapidl

38、y invert at the same speed to the fast forward. when the sliding table rapidly inverts to the termination of the fast forward, the travel valve 11 is loosened, and the oil return is smoother. the control oil line can be described below:inlet oil line: variable pump 2right frame of directional valve

39、2one-way valve 7right chamber of directional valve 2;outlet oil line: left chamber of directional valve 4throttling valve 8right chamber of directional valve 5oil boxthe details of the main oil line are as shown below:inlet oil line: variable pump 2one-way valve 3right chamber of directional valve 4

40、right chamber of hydraulic cylinder 10outlet oil line: right frame of hydraulic cylinder 10one-way valve 12right chamber of directional valve 4oil box1.6 fast retreat in-situ to stopwhen the sliding table rapidly inverts to the in-situ, the iron stop presses the termination travel switch and sends a

41、 signal to make the electromagnets 1ya, 2ya and 3ya power off, and then the solenoid directional valve 5 and hydraulic directional valve 4 are in the central frame, and the oil lines of both the left and right chambers of hydraulic cylinder are cut off and then the hydraulic cylinder is in a clamp s

42、tate, and the sliding table stops working. by now, the oil flowed by the variable pump 2 flows into the oil return box necessarily after passing through the one-way pumps 3 and 4, and then the system is in an unloading state.2 analysis on the no working feed faultof the power sliding table and the r

43、emoval steps2.1 analysis on the reasons for the faultthe power sliding table in modular machine tool keeps a normal speed in the fast feeding, and comes to a halt at the beginning of processing. based on the learnt knowledge of the principles of all kinds of hydraulic components and the maintenance

44、experiences from work, and through a detailed analysis, the main reasons for causing the no working feed fault may be the powerful cutting, insufficient system pressure, leakage, no oil supply by hydraulic pump or insufficient oil delivery amount, abrasion of hydraulic valve internal components, bro

45、ken line or locking, or the abrasion of hydraulic cylinder internal components resulting in the inner leakage or the sealing components squashing in the cylinder wall to arouse the increasing resistance of the executive components, etc.2.2 fault removal stepsdue to the leak tightness of the hydrauli

46、c system, the hydraulic fault is not as intuitional as the mechanical failures; the fault measurement is not as convenient as that of electric problems and is really uneasy to judge directly. it is highly difficulty to repair if the examination is started from the hydraulic station; not only will no

47、 reasons be found, but also some components will be disassembled blindly, and hence new faults will be resulted in. in order to search the reasons for the hydraulic faults with high efficiency, a reasonable fault detection sequence is built per the possibilities of the fault reasons and disassemblin

48、g and installing easiness of the hydraulic components or parts. namely, the sequence is check the general orientation of the fault per the number in the pressure meter first, and then disassemble the oil tube to check the faults (e.g.the internal leakages of the hydraulic pump and cylinder, or the c

49、rawling of the sliding table), and then indentify the real fault of the hydraulic valve.first, the cutting force of the working feed is examined: the cutting force of the working feed can be confirmed by examining the number in the hydraulic system pressure meter whether exceeding the normal pressur

50、e of the pump or not and the noise generated from the cutting and processing whether abnormal or not. the cutting force is indicated to be too large if abnormal. as the limited pressure variable vane pump as shown in figure 2 is used in a majority of modular machine tool, the needs of large deliveri

51、ng amount and low pressure of fast forward, and small delivering amount and high pressure of working feed can be fulfilled naturally, and the hydraulic system pressure rises along with the increase of the cutting force of the working feed. under the action of the feedback hydraulic oil, the plunger

52、5 drives the stator 3 to move to the left until the stator delivers nothing and is concentric with the rotor, and thereby there is no pressure oil in the oil inlet line and also the sliding table stops to work. the reasons for such a type of problems mainly include the abrasion of cutting tools, ins

53、ufficient sharpness, inconsistent component materials, existing of hard spots and especially multiple hard spots mixed in the roughcast. fault removal methods include check and replace high-quality cutting tools, or testing the roughcast hardness, improving the quality of roughcast.figure 2: the pri

54、nciple of limited pressure variable vane pumpsecond, whether the oil feeding of the variable vane pump is normal or not is examined. (1) fault analysis: when the power sliding table in modular machine tool keeps a normal speed in the fast feeding, the fault reasons such as the reverse installation o

55、f the hydraulic pump oil inlet and outlet, the inverting of the hydraulic pump, opposite eccentric directions of stator, vane clamped in the groove of vane, over-high oil viscosity to result in flexible the vane motion can be removed totally. however, when converting into the working feeding model,

56、the systems external load increases and also the sliding table stops to move, and hence causes the pump outlet pressure is higher and higher; and the hydraulic pump encounters a huge leakage owing to the internal abrasion of hydraulic pump, and then cannot export the pressure oil, and hence there is

57、 no working feed. (2) fault removal methods: the hydraulic pump can be first replaced, and then maintenance can be performed for the sake of next convenience. if all these tasks are tried and the internal leakage remains too large, it is necessary to use the hydraulic oil with high viscosity, and es

58、pecially in the summer.third, the oil box is examined to see whether it is above the lowest oil position, the filter is above the oil level, the oil return tube is higher than the oil level, and the oil filter is blocked by the impurities and dirt or not, etc.fourth, the system tube, coupling and components are examined to see whether they are leaked or not.fifth, the hydraulic cylinder is examined to see whether there is an internal leakage or over-large internal resistance. (1) fault analysis: if there is a local heating phenome