天然气发电机组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，必须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 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.

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。

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 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 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，必须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 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.

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。

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.