The cutting force of low-temperature minimum quantity lubrication (CAMQL) is 5% smaller than that of pouring cooling, and the cutting temperature is 3% higher. Casting cooling mainly relies on the convection heat transfer method of a large amount of cutting fluid. The flow rate of pouring cutting fluid is large, but the flow rate is low. The cutting fluid has no time to reach the gap in the main cutting area, and the mist cutting oil with low-temperature minimum quantity lubrication is carried by the cold wind and high-speed airflow. The lubricating oil particles enter the metal gap and are adsorbed on the metal surface. The friction is reduced, which has a negative impact on the cutting tools, chips, and workpieces. The cutting area between them is strongly cooled and lubricated. Due to the effect of high-pressure cold air, the chip removal effect is better and the cutting force can be significantly reduced.

       The cutting force of low-temperature minimum quantity lubrication (CAMQL) is nearly 25% smaller than that of air-cooled turning, and the cutting temperature is 30% lower. The main reason is that low-temperature MQL contains a little more cutting oil than simple air cooling, and these cutting oils are Carried by the high-speed cold air flow, the lubricating oil particles enter the metal gaps and are adsorbed on the metal surface, strongly cooling the cutting area between the tool, chips, and workpieces, and quickly forming an oil film between the chips and the tool, increasing the temperature of the chips. There is no time to transmit it to the tool and workpiece. This is the cooling mechanism of cold air cutting. On the other hand, when the cold air cools down and the low-temperature oil film changes the type of friction between the chip and the tool, it changes from dry friction to boundary friction, which reduces the friction and the friction heat. Therefore, under low-temperature cold air and micro-lubrication conditions, the cutting temperature is lower, and the tool has a longer service life in such an environment due to the protection of the oil film.