The smooth grinding of natural gas generator crankshaft is one of the key processes to ensure the repair quality. When the cylindrical surface of the timing gear journal and flywheel flange is used as the reference for smooth grinding, the bending degree shall be corrected before grinding. The runout of the middle main journal before grinding shall not be greater than 0.3mm. If the bending is not corrected in advance, after weaving, the crankshaft will produce a new axis that crosses the original flywheel flange and the axis of the timing gear, which changes the turning radius, destroys the dynamic balance force, shortens the service life, intensifies the wear of relevant parts, the timing gear makes a loud noise, the rear oil seal leaks, and increases the unbalanced rotating mass of the engine.

嚴(yán)格保證天然氣發(fā)電機(jī)組曲軸軸頸圓角半徑的尺寸符合圖紙要求，是修復(fù)質(zhì)量的關(guān)鍵性問題之一。但一般汽車修理廠對此并沒有足夠的重視，砂輪很少修磨，光磨的圓角半徑常小于規(guī)定的尺寸。有資料統(tǒng)計(jì)，圓角半徑小于2，5毫米，其疲勞強(qiáng)度只及圓角半徑為2．5毫米的80％以下。由于對光磨曲軸的砂輪，經(jīng)常用磨床附屬的砂輪圓角校正器修整，使磨得圓角尺寸符合要求，所以自振動(dòng)堆焊投產(chǎn)以來，沒有發(fā)生過斷軸現(xiàn)象。

It is one of the key problems in repair quality to strictly ensure that the dimension of crankshaft journal fillet radius of natural gas generator set meets the drawing requirements. However, the general automobile repair shop does not pay enough attention to this. The grinding wheel is rarely polished, and the fillet radius of smooth grinding is often less than the specified size. According to statistics, if the fillet radius is less than 2 or 5 mm, the fatigue strength is only less than 80% of the fillet radius of 2.5 mm. Since the grinding wheel for smooth grinding crankshaft is often trimmed with the grinding wheel fillet corrector attached to the grinder to make the rounded corner size meet the requirements, the shaft has not been broken since the vibration surfacing was put into production.

天然氣發(fā)電機(jī)組在工作中，曲軸由于受力和工作條件復(fù)雜，各摩擦表面滑動(dòng)速度很高，散熱條件又差，因此，曲軸的主軸頸和連桿軸頸在工作中不可避免地要產(chǎn)生磨損，而且磨損是不均勻的，其主要表現(xiàn)為軸頸出現(xiàn)圓度，圓柱度超過標(biāo)準(zhǔn)值和拉傷。連桿軸頸磨損的大部位，一般在各軸頸的內(nèi)側(cè)面上，即靠曲軸中線一側(cè)，使軸頸失圓；而磨損成錐形的部位，一般在潤滑油道雜質(zhì)附著的一側(cè)和受力大的部位上。曲軸主軸頸_的磨損部位，按發(fā)動(dòng)機(jī)的強(qiáng)化程度、氣缸數(shù)、曲軸長度和平衡塊的配重不同而各異,而且相對于連桿軸頸磨損要均勻些。實(shí)踐表明,連桿軸頸的磨損比主軸頸磨損要快，但是，主軸頸磨損比連桿軸頸磨損所造成的后果要嚴(yán)重。

During the operation of natural gas generator set, due to the complex stress and working conditions of the crankshaft, the sliding speed of each friction surface is very high, and the heat dissipation conditions are poor. Therefore, the main journal and connecting rod journal of the crankshaft will inevitably be worn during the operation, and the wear is uneven, which is mainly manifested in the roundness of the journal, the cylindricity exceeding the standard value and the strain. The large worn parts of the connecting rod journal are generally on the inner side of each journal, that is, the side near the centerline of the crankshaft, so that the journal is out of round; The parts worn into a cone are generally on the side where the impurities in the lubricating oil passage are attached and on the parts with large stress. Crankshaft main journal_ The wear parts vary according to the strengthening degree of the engine, the number of cylinders, the length of the crankshaft and the counterweight of the balance weight, and the wear is more uniform relative to the connecting rod journal. The practice shows that the wear of connecting rod journal is faster than that of main journal, but the wear of main journal is more serious than that of connecting rod journal.

天然氣發(fā)電機(jī)組檢驗(yàn)與處理方法。根據(jù)各軸頸磨損規(guī)律查找出磨損部位,可用外徑測微器測量其圓度和圓柱度以便確定曲軸的修理級別和磨削尺寸。

Inspection and treatment methods for natural gas generating units. The worn parts can be found out according to the wear law of each journal, and the roundness and cylindricity can be measured with an outer diameter micrometer to determine the repair level and grinding size of the crankshaft.

曲軸的光磨加工情況，是保證修復(fù)質(zhì)量的關(guān)鍵工序之一。以正時(shí)齒輪軸頸和飛輪突緣的外圓表面作為光磨裝-膏基準(zhǔn)時(shí)，先校正彎曲度再進(jìn)行磨削，磨前中間主軸頸的擺差不得大于o．3毫米。如果不預(yù)先校正彎曲，織削以后將會(huì)使曲軸產(chǎn)生與原來飛輪突緣和正時(shí)齒輪軸線交叉的新軸線，改變了回轉(zhuǎn)半徑，破壞了動(dòng)平衡力，縮短使用壽命，加劇有關(guān)零件的磨耗，正時(shí)齒輪的響聲也大，后油封漏汕，增加了發(fā)動(dòng)機(jī)的不平衡旋轉(zhuǎn)質(zhì)量。

The smooth grinding of crankshaft is one of the key processes to ensure the repair quality. When the cylindrical surface of the timing gear journal and flywheel flange is used as the reference for smooth grinding, the bending degree shall be corrected before grinding. The runout of the middle main journal before grinding shall not be greater than 0.3mm. If the bending is not corrected in advance, after weaving, the crankshaft will produce a new axis that crosses the original flywheel flange and the axis of the timing gear, which changes the turning radius, destroys the dynamic balance force, shortens the service life, intensifies the wear of relevant parts, the timing gear makes a loud noise, the rear oil seal leaks, and increases the unbalanced rotating mass of the engine.

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