天然氣發(fā)電機(jī)組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)，必須先校正彎曲度再進(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 processing of the crankshaft of natural gas generator sets is one of the key processes to ensure the quality of repair. When using the outer surface of the timing gear journal and flywheel flange as the reference for grinding paste, it is necessary to first correct the curvature before grinding. The runout of the middle main journal before grinding should not exceed 0.3 millimeters. If the bending is not corrected in advance, after weaving, the crankshaft will generate a new axis that intersects with the original flywheel flange and timing gear axis, changing the turning radius, damaging the dynamic balance force, shortening the service life, intensifying the wear of related parts, making loud noises from the timing gear, leaking the rear oil seal, and increasing the unbalanced rotational 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(duì)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(duì)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。

Strictly ensuring that the size of the crankshaft journal fillet radius of natural gas generator units meets the drawing requirements is one of the key issues in repairing quality. However, most car repair shops do not attach enough importance to this, and grinding wheels are rarely used for grinding. The rounded radius of smooth grinding is often smaller than the specified size. According to data statistics, if the fillet radius is less than 2.5 millimeters, its fatigue strength is only below 80% of that of a fillet radius of 2.5 millimeters. Due to the frequent use of the grinding wheel corner corrector attached to the grinding machine to adjust the grinding wheel for smooth grinding of the crankshaft, the rounded corner size meets the requirements. Therefore, since the production of vibration welding, there has been no occurrence of shaft breakage.

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，即靠曲軸中心線一側(cè)，使軸頸失圓；而磨損成錐形的部位，一般在潤(rùn)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(zhǎng)度和平衡塊的配重不同而各異,而且相對(duì)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 sets, the crankshaft is subjected to complex forces and working conditions, resulting in high sliding speeds on various friction surfaces and poor heat dissipation conditions. Therefore, the main journal and connecting rod journal of the crankshaft inevitably experience wear during operation, and the wear is uneven, mainly manifested as roundness, cylindricity exceeding the standard value, and tensile damage. The large area of wear on the connecting rod journal is generally on the inner surface of each journal, which is on the side near the centerline of the crankshaft, causing the journal to lose its roundness; The parts that wear into a cone are generally on the side where impurities attach to the lubricating oil passage and on the parts that are subjected to high force. The wear area of the crankshaft main journal varies according to the degree of engine strengthening, number of cylinders, crankshaft length, and balance weight, and the wear is more uniform compared to the connecting rod journal. Practice has shown that the wear of the connecting rod journal is faster than that of the main shaft journal, but the consequences of the main shaft journal wear are more serious than those of the connecting rod journal wear.

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(cè)微器測(cè)量其圓度和圓柱度以便確定曲軸的修理級(jí)別和磨削尺寸。

Inspection and handling methods for natural gas generator sets. Based on the wear pattern of each journal, identify the worn area and measure its roundness and cylindricity using 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)，必須先校正彎曲度再進(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 the crankshaft is one of the key processes to ensure the quality of repair. When using the outer surface of the timing gear journal and flywheel flange as the reference for grinding paste, it is necessary to first correct the curvature before grinding. The runout of the middle main journal before grinding should not exceed 0.3 millimeters. If the bending is not corrected in advance, after weaving, the crankshaft will generate a new axis that intersects with the original flywheel flange and timing gear axis, changing the turning radius, damaging the dynamic balance force, shortening the service life, intensifying the wear of related parts, making loud noises from the timing gear, leaking the rear oil seal, and increasing the unbalanced rotational mass of the engine.

嚴(yán)格保證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(duì)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(duì)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。

Strictly ensuring that the size of the crankshaft journal fillet radius meets the drawing requirements is one of the key issues in repairing quality. However, most car repair shops do not attach enough importance to this, and grinding wheels are rarely used for grinding. The rounded radius of smooth grinding is often smaller than the specified size. According to data statistics, if the fillet radius is less than 2.5 millimeters, its fatigue strength is only below 80% of that of a fillet radius of 2.5 millimeters. Due to the frequent use of the grinding wheel corner corrector attached to the grinding machine to adjust the grinding wheel for smooth grinding of the crankshaft, the rounded corner size meets the requirements. Therefore, since the production of vibration welding, there has been no occurrence of shaft breakage.