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Application of micro oil and gas lubrication system in 5-axis machining

Do you understand the application of micro oil and gas lubrication system in five-axis machining? High-speed five-axis machining centers are mainly used for processing complex structures and free-form surfaces, producing parts mainly for complex precision parts in the military and aerospace fields, with high requirements for processing conditions and surface quality of parts. At the same time, environmental protection, cost, processing technology are higher challenges to our high-end CNC machine tools. Considering that the traditional cutting fluid cooling method can no longer meet the requirements of high-speed high-quality processing, the exploration of green and efficient lubrication and cooling method is the trend.

First, the traditional cooling method and its shortcomings

In the traditional counting process, a large amount of cutting fluid is usually poured in to reduce the cutting temperature, protect the walking tool and the surface of the counting part, and flush the residual chips. However, during the high-speed cutting process, the cutting fluid poured into the cutting part splashes around, and only a very small percentage of cutting fluid enters the cutting area, which makes it difficult to achieve good cooling of the counted parts and the walking tool.

Under the action of traditional coolant, the surface of the counted parts has a quenching effect when cutting at high speed, and the hardened metal surface will reduce the life of the walking tool. Relevant data show that cutting fluid accounts for about 15% of the cost of a piece counting process, and cutting fluid can affect the processing environment inside the factory and cause some harm to workers' skin and even respiratory tract. Waste cutting fluid, if improperly handled, will pollute the environment and damage the soil and groundwater, producing far-reaching negative effects.

Second, trace oil and gas lubrication system technology

The working principle of micro oil and gas lubrication system is: clean compressed air will blow the liquid lubricating oil into micron-level oil mist, oil mist high-speed spray in the machined parts and go tool surface, reduce the friction between the tool and the parts, reduce the processing temperature, to avoid the quenching effect brought by cooling cutting fluid, to achieve the effect of lubrication and cooling.

Micro oil and gas lubrication system adopts oil mist lubrication and cooling, most of the lubricating oil adopts environmental protection materials, the actual consumption is very small, generally 0.03 ~ 0.20 L/h, while the traditional method of cooling, the cutting fluid consumption is up to 50 ~ 200 L/min. Micro lubrication technology consumes only one ten thousandth of the cutting fluid consumed in the traditional way, which greatly reduces the processing cost. Moreover, the counted parts and chips are dry after machining, saving post-processing work. This quasi-dry cutting is very green.

At the same time, the micro oil and gas lubrication system has the advantages of small space occupation and easy maintenance and management, eliminating a whole set of complicated equipment such as cutting fluid storage tank, water pump, piping, waterproof treatment and cutting fluid recovery. This is needed for traditional cooling methods.

Pneumatic oil pump is a single-acting plunger type booster pump. After introducing compressed air, pressurized oil enters the metering part in the oil-air mixer and discharges a certain amount of oil, which is mixed with compressed air in the oil-air mixer to form oil mist. The oil mist is mixed with compressed air for the second time at the nozzle and precisely sprayed to the friction part of the cutting edge, forming an oil film between the walking tool and the measuring part, thus completing the cutting process under efficient lubrication.

The lubricating performance of the oil film is much better than that of traditional cutting fluids, and it can significantly reduce the heat generated between the walking tool, the counters and the chips. At the same time, the high-speed compressed air blows away part of the heat and chips, giving full play to the role of suppressing temperature rise, reducing tool wear, preventing sticking and improving the surface quality of the counters.