Tool micro-lubrication technology mainly has two ways: external lubrication of aerosol and internal cooling of aerosol
Aerosol external lubrication method: the cutting fluid is sent to the high-pressure injection system and mixed with the gas to atomize, and then the atomic droplets of millimeters and micrometers are sprayed onto the surface of the machining tool through one or more nozzles to cool the cutter and lubricating;
In-fog cooling method: The cooling air mist is directly sent to the cutting area through the holes in the main shaft and the tool for cooling and lubrication.
The external lubrication system is generally composed of an air compressor, an oil pump, a control valve, a nozzle and a pipe accessory. The integrated system is low in cost and light in weight and can be easily installed on the machine tool . However, since the orientation of the nozzle has a significant influence on the lubrication effect, it is necessary to determine the optimal position and the spray angle of the nozzle; the externally lubricated mist particles are difficult to enter the processing area of ​​the deep hole drilling, so the cooling effect on the deep hole processing is not good; The externally lubricated fog particles are small and easy to fly around, which will have a certain impact on the working environment, so it is necessary to have supporting facilities.
The internal lubrication system supplies lubricant through the main shaft and the internal passage of the tool , which can directly reach the processing area, and the lubrication is sufficient, and the general effect is better than the external lubrication. However, the internal lubrication system also has disadvantages: the structure of the machine tool spindle and the tool system becomes complicated, and even affects the working performance of the entire machine tool ; when the spindle speed is too high, it is affected by the centrifugal force, and the cutting fluid is easy to adhere to the spindle and the tool. The hole wall is not easy to reach the cutting zone. At present, the spindle speed of the machine tool using internal MQL technology generally does not exceed 20,000-30000 r/min. During the processing, the chip is easy to block the nozzle, which seriously affects the lubrication effect; the internal lubrication system needs to focus on the fog particle generating device. The diameter of the generated mist particles must be small enough to reduce the influence of inertia and gravity, so that the mist particles remain suspended and smoothly pass through the internal passage.
There are two forms of transfer atomization for micro-cutting fluids: one is a single channel, which requires a separate atomizing device, and then a mixture of atomized droplets and compressed air is transmitted through a channel. Nozzle; the other is a two-channel, does not require a separate atomizing device, through two channels, the small channel inside is a small amount of cutting fluid, the external large channel is compressed air, and the nozzle is used for fogging near the nozzle (atomization zone) And then sprayed into the cutting zone. Compared with the two-channel system, the single-channel system is easier to manufacture, but when conveying the lubricating oil mist, especially in the rotating main shaft with strong centrifugal action, the oil mist will be separated, which often leads to the oil mist in the processing area. Evenly, the processing quality is deteriorated.
The spindle speed of the machine tool is one of the decisive factors for the single-segment, dual-channel: Single-channel system: oil and gas are mixed before passing through the machine spindle, so the machine speed can be up to 16000 rpm. The higher the rotational speed, the greater the centrifugal force, which causes the mixed oil to separate again. Dual channel system: The maximum speed of the machine is 40,000 rpm. The tool change frequency is a single choice for the dual channel. Single channel system: The oil mist requires a long transfer time to reach the tool cutting location from the spray synthesizer via the machine spindle. Dual channel system: Oil mist can be ejected in an instant, only about 0.1~0.3 seconds. (This allows for a short time to change the tool, less fuel waste, and more cost savings.) Of course, a single-channel system is more convenient when converting MQL and wet machining, because the single-channel system directly inputs the mixed oil and gas into the rotary distributor. Just entered the inner cooling tube. A two-channel system is not acceptable.
In order to give full play to the application advantages of MQL and seek the best balance between economic, ecological and processing performance, it is necessary to comprehensively study various factors affecting the performance of MQL applications. Dopo is looking forward to cooperating with you, and will tailor the micro-lubrication solution that suits you best according to your situation! Free hotline
Aerosol external lubrication method: the cutting fluid is sent to the high-pressure injection system and mixed with the gas to atomize, and then the atomic droplets of millimeters and micrometers are sprayed onto the surface of the machining tool through one or more nozzles to cool the cutter and lubricating;
In-fog cooling method: The cooling air mist is directly sent to the cutting area through the holes in the main shaft and the tool for cooling and lubrication.
The external lubrication system is generally composed of an air compressor, an oil pump, a control valve, a nozzle and a pipe accessory. The integrated system is low in cost and light in weight and can be easily installed on the machine tool . However, since the orientation of the nozzle has a significant influence on the lubrication effect, it is necessary to determine the optimal position and the spray angle of the nozzle; the externally lubricated mist particles are difficult to enter the processing area of ​​the deep hole drilling, so the cooling effect on the deep hole processing is not good; The externally lubricated fog particles are small and easy to fly around, which will have a certain impact on the working environment, so it is necessary to have supporting facilities.
The internal lubrication system supplies lubricant through the main shaft and the internal passage of the tool , which can directly reach the processing area, and the lubrication is sufficient, and the general effect is better than the external lubrication. However, the internal lubrication system also has disadvantages: the structure of the machine tool spindle and the tool system becomes complicated, and even affects the working performance of the entire machine tool ; when the spindle speed is too high, it is affected by the centrifugal force, and the cutting fluid is easy to adhere to the spindle and the tool. The hole wall is not easy to reach the cutting zone. At present, the spindle speed of the machine tool using internal MQL technology generally does not exceed 20,000-30000 r/min. During the processing, the chip is easy to block the nozzle, which seriously affects the lubrication effect; the internal lubrication system needs to focus on the fog particle generating device. The diameter of the generated mist particles must be small enough to reduce the influence of inertia and gravity, so that the mist particles remain suspended and smoothly pass through the internal passage.
There are two forms of transfer atomization for micro-cutting fluids: one is a single channel, which requires a separate atomizing device, and then a mixture of atomized droplets and compressed air is transmitted through a channel. Nozzle; the other is a two-channel, does not require a separate atomizing device, through two channels, the small channel inside is a small amount of cutting fluid, the external large channel is compressed air, and the nozzle is used for fogging near the nozzle (atomization zone) And then sprayed into the cutting zone. Compared with the two-channel system, the single-channel system is easier to manufacture, but when conveying the lubricating oil mist, especially in the rotating main shaft with strong centrifugal action, the oil mist will be separated, which often leads to the oil mist in the processing area. Evenly, the processing quality is deteriorated.
The spindle speed of the machine tool is one of the decisive factors for the single-segment, dual-channel: Single-channel system: oil and gas are mixed before passing through the machine spindle, so the machine speed can be up to 16000 rpm. The higher the rotational speed, the greater the centrifugal force, which causes the mixed oil to separate again. Dual channel system: The maximum speed of the machine is 40,000 rpm. The tool change frequency is a single choice for the dual channel. Single channel system: The oil mist requires a long transfer time to reach the tool cutting location from the spray synthesizer via the machine spindle. Dual channel system: Oil mist can be ejected in an instant, only about 0.1~0.3 seconds. (This allows for a short time to change the tool, less fuel waste, and more cost savings.) Of course, a single-channel system is more convenient when converting MQL and wet machining, because the single-channel system directly inputs the mixed oil and gas into the rotary distributor. Just entered the inner cooling tube. A two-channel system is not acceptable.
In order to give full play to the application advantages of MQL and seek the best balance between economic, ecological and processing performance, it is necessary to comprehensively study various factors affecting the performance of MQL applications. Dopo is looking forward to cooperating with you, and will tailor the micro-lubrication solution that suits you best according to your situation! Free hotline
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