The polishing of the crankshaft of the natural gas generator unit 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, it is necessary to correct the curvature before grinding, and the runout of the middle main journal before grinding shall not be greater than 0.3 mm. If the bending is not corrected in advance, after weaving, the crankshaft will produce a new axis intersecting with the original flywheel flange and timing gear axis, which changes the radius of gyration, destroys the dynamic balance force, shortens the service life, increases the wear of related parts, makes a loud noise of the timing gear, leaks the rear oil seal, and increases the unbalanced rotating quality of the engine.

嚴格保證天然氣發電機組曲軸軸頸圓角半徑的尺寸符合圖紙要求，是修好質量的關鍵性問題之一。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定的尺寸。有資料統計，圓角半徑小于2，5毫米，其疲勞強度只及圓角半徑為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，所以自振動堆焊投產以來，沒有發生過斷軸現象。

It is one of the key problems to ensure that the size of the fillet radius of the crankshaft journal of the natural gas generator unit meets the requirements of the drawings. However, the general automobile repair shop does not pay enough attention to this, and the grinding wheel is rarely repaired. The fillet radius of the smooth grinding is often less than the specified size. According to statistics, if the fillet radius is less than 2,5 mm, its fatigue strength is less than 80% of that of 2.5 mm. Since the grinding wheel for smooth grinding the crankshaft is often trimmed with the wheel fillet corrector attached to the grinder to make the size of the rounded corner meet the requirements, there has been no shaft breakage since the vibration surfacing was put into production.

天然氣發電機組在工作中，曲軸由于受力和工作條件復雜，各摩擦表面滑動速度很高，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生磨損，而且磨損是不均勻的，其主要表現為軸頸出現圓度，圓柱度超過標準值和拉傷。連桿軸頸磨損的大部位，一般在各軸頸的內側面上，即靠曲軸中心線一側，使軸頸失圓；而磨損成錐形的部位，一般在潤滑油道雜質附著的一側和受力大的部位上。曲軸主軸頸_的磨損部位，按發動機的強化程度、氣缸數、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重。

During the operation of natural gas generator unit, 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 condition is poor, therefore, the main journal and connecting rod journal of the crankshaft will inevitably wear during the operation, and the wear is uneven, which is mainly manifested in the roundness of the journal, the cylindricity exceeds the standard value and the strain. The large worn part of the connecting rod journal is generally on the inner side of each journal, that is, the side close to the centerline of the crankshaft, which makes the journal out of round; The parts that wear into a cone are generally on the side where impurities are attached to the lubricating oil passage and on the parts with large force. Crankshaft main journal_ The wear parts of the engine are different 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 with respect to the connecting rod journal. Practice shows that the wear of the connecting rod journal is faster than that of the main journal, but the wear of the main journal is more serious than that of the connecting rod journal.

天然氣發電機組檢驗與處理方法。根據各軸頸磨損規律查找出磨損部位,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 generator units. Find out the wear part according to the wear rule of each journal, and measure its roundness and cylindricity with an outside diameter micrometer to determine the repair level and grinding size of the crankshaft.

曲軸的光磨加工情況，是保證修復質量的關鍵工序之一。以正時齒輪軸頸和飛輪突緣的外圓表面作為光磨裝-膏基準時，需要先校正彎曲度再進行磨削，磨前中間主軸頸的擺差不得大于o．3毫米。如果不預先校正彎曲，織削以后將會使曲軸產生與原來飛輪突緣和正時齒輪軸線交叉的新軸線，改變了回轉半徑，破壞了動平衡力，縮短使用壽命，加劇有關零件的磨耗，正時齒輪的響聲也大，后油封漏汕，增加了發動機的不平衡旋轉質量。

The polishing 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, it is necessary to correct the curvature before grinding, and the runout of the middle main journal before grinding shall not be greater than 0.3 mm. If the bending is not corrected in advance, after weaving, the crankshaft will produce a new axis intersecting with the original flywheel flange and timing gear axis, which changes the radius of gyration, destroys the dynamic balance force, shortens the service life, increases the wear of related parts, makes a loud noise of the timing gear, leaks the rear oil seal, and increases the unbalanced rotating quality of the engine.

嚴格保證曲軸軸頸圓角半徑的尺寸符合圖紙要求，是修復質量的關鍵性問題之一。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定的尺寸。有資料統計，圓角半徑小于2，5毫米，其疲勞強度只及圓角半徑為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，所以自振動堆焊投產以來，沒有發生過斷軸現象。

It is one of the key problems of repair quality to strictly ensure that the size of crankshaft journal fillet radius meets the drawing requirements. However, the general automobile repair shop does not pay enough attention to this, and the grinding wheel is rarely repaired. The fillet radius of the smooth grinding is often less than the specified size. According to statistics, if the fillet radius is less than 2,5 mm, its fatigue strength is less than 80% of that of 2.5 mm. Since the grinding wheel for smooth grinding the crankshaft is often trimmed with the wheel fillet corrector attached to the grinder to make the size of the rounded corner meet the requirements, there has been no shaft breakage since the vibration surfacing was put into production.

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