Application of CBN grinding wheel in grinding process In addition to the tool for making CBN material, the largest application field is CBN grinding tool, which is used for high-speed and high-efficiency grinding and honing processing, which can greatly improve the grinding efficiency. Sharpening accuracy and quality are improved by one level.
1. Grinding automotive parts - camshafts and crankshafts
The camshaft on the automobile engine has a plurality of cams, and the coarse grinding and fine grinding of the cam after quenching are the key processes that affect the quality of the cam. Generally, the grinding is simulated, the speed of the workpiece is limited, and the workpiece is prone to wear and burn cracks. The shape of the cam surface of the cam surface is affected by the diameter of the grinding wheel. Ensure that the curve of the cam wheel is correct. Production practice proves that when the diameter of the grinding wheel is large, the grinding cam is thin. When the diameter of the grinding wheel is small, the grinding cam is fat, only when the diameter of the grinding wheel is close to or equal to the diameter of the roller for grinding the cam (generally φ570 mm), The profiling error is close to zero, ie the curved cam surface vertex curve is close to the cam. In actual production, the diameter of the grinding wheel used is generally from D600 (or 610) to D500, which is much different from the ideal grinding wheel diameter (570). Therefore, the cam curve of most camshafts exceeds the standard in production. In order to solve this problem, we use CBN grinding wheel grinding on the analog cam grinding machine. The diameter of CBN grinding wheel can be made into D575, the thickness of CBN abrasive layer is 4~5mm, the grinding diameter of grinding wheel is D565, grinding diameter Although the range is only 10mm, the number of grinding parts is equivalent to dozens of ordinary grinding wheels, which not only ensures the correct cam curve, but also does not cause grinding burns.
For example, Liton Industrial Automation Company uses CBN grinding wheels to grind camshafts, which reduces the cost by 50% and the fatigue strength of the cam surface by 30%. Dongfeng Motor Corporation's Xiangfan diesel engine plant uses ceramic bond CBN grinding wheels to grind cold-casting cast iron camshafts. The cam grinding allowance t=4～5mm, υ sand=60m/s, workpiece rotation speed n=100r/min, υf=0.1mm/s, using high-speed grinding fluid, the life of CBN grinding wheel is basically equivalent to 20 pieces. Corundum abrasive wheel.
2.Application of CBN grinding wheel in internal hole grinding
The efficiency of internal grinding has been low, mainly due to the grinding speed, the material of the grinding wheel and the rigidity of the grinding rod. In the production process, it takes almost 1/3 to 1/5 of the time for dressing the grinding wheel and replacing the grinding wheel. If the inner circle or groove grinding adopts the CBN electroplating grinding wheel, and the grinding wheel speed is increased, and the diameter of the grinding rod is increased, the workpiece rotation speed and the feed speed can be appropriately increased, and the hole (arc) diameter and the groove width size and shape can be ensured. Position accuracy, surface roughness and avoidance of burns, but also can double the processing efficiency and reduce processing costs.
For example, a domestic factory processing a spinning bearing sleeve with an annual output of 600,000 pieces, grinding holes of φ15.5+0.04 and adjacent arc grooves. In the past, chrome corundum (GG) grinding wheels were used in two processes. M224 internal circular grinding machine processing, the groove (arc) diameter difference and the coaxiality of the size and the hole is difficult to guarantee, and the efficiency is low. After the CBN grinding wheel is used, the grinding rod is thickened, the feed rate is increased, and the trimming is saved. And the time to replace the grinding wheel completely solved the original problem. Later, it was changed to hole and groove at the same time, that is, two grinding wheels were installed on the grinding rod, which improved the grinding efficiency by one time and saved one grinding machine. The surface roughness of the machined workpiece is Ra0.63μm. The grinding process parameters are: υ sand = 36m / s, υ 2 = 19m / min, f rough cut = 1μm / r, f fine cut = 0.5μm / r, light grinding Time t = bs, using an emulsification value of 10% concentration.
3. Grinding gears with CBN grinding wheel
In the past, gear grinding used single-tooth surface and multi-tooth surface grinding. Although single-tooth surface grinding can obtain high machining accuracy, it has low efficiency and high cost. Although multi-tooth surface grinding has high production efficiency, its processing is high. The quality is worse than single tooth grinding. If CBN grinding is used, whether it is single-tooth grinding or multi-tooth grinding, grinding with CBN grinding wheel or ceramic bond grinding wheel is very effective:
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