Please provide the Chinese content to be translated.No Chinese content provided.FlatGrinding MachineEquipmentAt that time, becauseProcessing TechnologyDue to differences, cracks often occur in product components. For many machining processes, preventing cracks in components is a crucial technical operation. There are numerous solutions, and we will briefly discuss four of them below.
1. Coarse and fine grinding are conducted on two separate grinding machines. During the coarse grinding process, a coarser-grained soft sand is used for better aggressive grinding and increased production efficiency. Subsequently, a finer-grained abrasive wheel is employed for the fine grinding.
As the grinding wheel speed increases, the frictional force caused by compression also grows, leading to a rise in temperature within the crankshaft grinding area and an increase in thermal stress. Therefore, it is not advisable to use excessively high grinding wheel speeds during the grinding of round corner quenched crankshafts.
3. High hardness of workpiece material causes the abrasive particles to dull easily, increasing friction, leading to extrusion on the workpiece surface. This results in greater heat generation in the grinding area and larger temperature differences on the shaft diameter surface. The greater the temperature on either side of the interface, the higher the tensile stress induced. When the instantaneous stress exceeds the fracture strength of the quenched layer's organization on the shaft diameter surface, vertical cracks along the grinding direction will occur. To ensure timely shedding of worn abrasive particles, a softer grinding wheel should be used to prevent surface burns on the crankshaft diameter.
4. Planer grinding wheel should be timely resurfaced; otherwise, as the wheel dulls, the cutting action decreases. This exacerbates the friction and pressure between the wheel and the crankshaft, significantly increasing both grinding force and heat. This can easily lead to surface burns on the crankshaft diameter and the formation of tiny cracks. Therefore, it is crucial to resurface the wheel promptly to ensure the sharpness of the abrasive grains.
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