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.

严格保证天然气发电机组曲轴轴颈圆角半径的尺寸符合图纸要求，是修好质量的关键性问题之一。但一般汽车修理厂对此并没有足够的重视，砂轮很少修磨，光磨的圆角半径常小于规定的尺寸。有资料统计，圆角半径小于2，5毫米，其疲劳强度只及圆角半径为2．5毫米的80％以下。由于对光磨曲轴的砂轮，经常用磨床附属的砂轮圆角校正器修整，使磨得圆角尺寸符合要求，所以自振动堆焊投产以来，没有发生过断轴现象。

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.

天然气发电机组在工作中，曲轴由于受力和工作条件复杂，各摩擦表面滑动速度很高，散热条件又差，因此，曲轴的主轴颈和连杆轴颈在工作中不可避免地要产生磨损，而且磨损是不均匀的，其主要表现为轴颈出现圆度，圆柱度超过标准值和拉伤。连杆轴颈磨损的大部位，一般在各轴颈的内侧面上，即靠曲轴中心线一侧，使轴颈失圆；而磨损成锥形的部位，一般在润滑油道杂质附着的一侧和受力大的部位上。曲轴主轴颈_的磨损部位，按发动机的强化程度、气缸数、曲轴长度和平衡块的配重不同而各异,而且相对于连杆轴颈磨损要均匀些。实践表明,连杆轴颈的磨损比主轴颈磨损要快，但是，主轴颈磨损比连杆轴颈磨损所造成的后果要严重。

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.

天然气发电机组检验与处理方法。根据各轴颈磨损规律查找出磨损部位,可用外径测微器测量其圆度和圆柱度以便确定曲轴的修理级别和磨削尺寸。

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.

曲轴的光磨加工情况，是保证修复质量的关键工序之一。以正时齿轮轴颈和飞轮突缘的外圆表面作为光磨装-膏基准时，需要先校正弯曲度再进行磨削，磨前中间主轴颈的摆差不得大于o．3毫米。如果不预先校正弯曲，织削以后将会使曲轴产生与原来飞轮突缘和正时齿轮轴线交叉的新轴线，改变了回转半径，破坏了动平衡力，缩短使用寿命，加剧有关零件的磨耗，正时齿轮的响声也大，后油封漏汕，增加了发动机的不平衡旋转质量。

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.

严格保证曲轴轴颈圆角半径的尺寸符合图纸要求，是修复质量的关键性问题之一。但一般汽车修理厂对此并没有足够的重视，砂轮很少修磨，光磨的圆角半径常小于规定的尺寸。有资料统计，圆角半径小于2，5毫米，其疲劳强度只及圆角半径为2．5毫米的80％以下。由于对光磨曲轴的砂轮，经常用磨床附属的砂轮圆角校正器修整，使磨得圆角尺寸符合要求，所以自振动堆焊投产以来，没有发生过断轴现象。

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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