發(fā)電機(jī)組曲軸軸頸上的軸向裂紋很細(xì)，也較淺，但裂紋條數(shù)很多。沼氣發(fā)電機(jī)組廠家認(rèn)為，產(chǎn)生這種裂紋的原因是曲軸在缺油狀態(tài)下工作。對(duì)于帶有軸向裂紋的曲軸，如裂紋輕微，可進(jìn)行拋光處理后繼續(xù)使用；如裂紋嚴(yán)重，須進(jìn)行等級(jí)磨削。

The axial cracks on the crankshaft journal of the generator set are very thin and shallow, but there are many cracks. The biogas generator unit manufacturer believes that the reason for this crack is that the crankshaft works under the condition of oil shortage. For the crankshaft with axial crack, if the crack is slight, it can be used after polishing; If the crack is serious, grade grinding must be carried out.

這種裂紋，特別是軸頸過渡圓角處的裂紋，與曲軸的支承階梯度超差有密切關(guān)系。曲軸的支承階梯度是支承各主軸頸的軸瓦內(nèi)圓表面的同軸度及曲軸各主軸頸的同軸度綜合積累的差值，它大大地影響著曲軸頸圓根處的應(yīng)力，因此須嚴(yán)格控制同軸度。

This kind of crack, especially the crack at the transition fillet of the journal, is closely related to the out-of-tolerance of the support ladder of the crankshaft. The bearing ladder of the crankshaft is the difference between the coaxiality of the inner surface of the bearing bush supporting each main journal and the coaxiality of each main journal of the crankshaft. It greatly affects the stress at the root of the crankshaft journal, so the coaxiality must be strictly controlled.

預(yù)防這種裂紋產(chǎn)生的辦法是不要讓曲軸在油壓不足的情況下工作。軸頸上其他形式裂紋及其軸頸過渡圓角處的裂紋(可用著色探傷法確定)，輕微者可磨削處理，如經(jīng)等級(jí)磨削修理仍無法消除，應(yīng)作報(bào)廢處理。

The way to prevent such cracks is not to let the crankshaft work under insufficient oil pressure. Other forms of cracks on the journal and the cracks at the transition fillet of the journal (determined by the dye flaw detection method) can be ground if they are slight. If they cannot be eliminated after grade grinding and repair, they should be scrapped.

實(shí)際上曲軸的疲勞裂紋多發(fā)生于軸頸與曲柄臂相連的過渡圓角處以及軸頸中間油孔處。前一種裂紋為橫向裂紋，是曲軸斷裂的先兆，即從出現(xiàn)微細(xì)裂紋，逐漸延伸，后在特定條件下發(fā)生斷裂，后一種裂紋為縱向裂紋，由油孔處往軸向展開。

In fact, the fatigue cracks of the crankshaft mostly occur at the transition fillet between the journal and the crank arm and at the oil hole in the middle of the journal. The former crack is a transverse crack, which is the precursor of crankshaft fracture, that is, from the appearance of micro-cracks to the gradual extension, and then to the fracture under specific conditions. The latter crack is a longitudinal crack, which extends from the oil hole to the axial direction.

曲軸裂紋微細(xì)，用肉眼不易看出，可用磁力探傷儀進(jìn)行檢查。在條件不具備的情況下，簡(jiǎn)易的檢查方法是浸油錘擊法：先將曲軸浸入煤油中片刻，取出擦凈后，撒上白粉，然后用手錘分段在曲軸臂 _上敲擊，由于震動(dòng)，裂紋內(nèi)的煤油滲出，使白粉顯出油跡呈現(xiàn)黃色線痕，據(jù)此即可判定裂紋位置和長度。

The cracks on the crankshaft are very fine and can not be easily seen with the naked eye. Magnetic flaw detector can be used for inspection. If the conditions are not met, the simple inspection method is immersion hammering: first immerse the crankshaft in kerosene for a moment, take it out and wipe it clean, sprinkle white powder, and then use a hammer to segment the crankshaft arm_ The kerosene in the crack seeps out due to the vibration of the upper percussion, making the white powder show oil stains and yellow line marks, which can be used to determine the crack position and length.

軸頸有橫向裂紋的曲軸，不宜繼續(xù)使用，但是，橫向裂紋細(xì)小，經(jīng)磨削后在修理尺寸范圍內(nèi)能消除的，尚可使用，否則，必須予以更換，軸頸有縱向裂紋，也應(yīng)磨削消除，在磨削條件不具備的情況下曲軸繼續(xù)使用的原則是：裂紋未過兩端圓角處或油孔邊緣處時(shí)，尚可繼續(xù)使用，但不可在超負(fù)荷下工作，不能猛轟油門，并在使用中加強(qiáng)檢查，以防裂紋延伸而折斷。

The crankshaft with transverse cracks in the journal is not suitable for further use. However, if the transverse cracks are small and can be eliminated within the repair size after grinding, they can still be used. Otherwise, they must be replaced. If the journal has longitudinal cracks, they should also be eliminated by grinding. The principle for the crankshaft to continue to be used under the condition that the grinding conditions are not available is: the crankshaft can still be used when the cracks have not passed the fillet at both ends or the edge of the oil hole, but it cannot work under overload, Do not bang the accelerator, and strengthen the inspection during use to prevent the crack from extending and breaking.

以上就是問題的相關(guān)解答內(nèi)容了，希望能夠給您好的幫助，當(dāng)然您在使用該設(shè)備時(shí)要好好的進(jìn)行檢查與維護(hù)，防止問題的出現(xiàn)損壞設(shè)備，更多注意事項(xiàng)就來我們網(wǎng)站http://m.hdlelisa.com咨詢吧！

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