Effect of minimal quantities of lubricant on dry cutting
Minimal Quantity Lubrication (MQL), refers to the working condition of Lubrication lubricant dosage is very little. It is used in cutting, a high-speed rotating mechanism such as high-speed centrifuge lubrication. In the cutting is also called the minimum amount of lubrication, that is, the minimum amount of cutting fluid to achieve the best cutting effect is a metal processing lubrication, that is, semi-dry cutting.
The compressed gas (air, nitrogen, carbon dioxide, etc.) is mixed with extremely small amount of lubricating oil and vaporized to form a liquid mist containing micron level, which is sprayed to the cutting area or moving pair at high speed through the nozzle, so as to effectively cool and lubricate the cutting area or moving pair. This type of lubrication is called trace lubrication or mixed lubrication.
The performance of the cutting tool
The cutting tool performance depends on the tool material and tool structure and geometric parameters. Different machining methods must have a different emphasis on tool design MQL trace lubrication device. For dry cutting tool must have the following aspects of performance:
1. The cutter should have high heat resistance and good wear resistance.
2. The friction coefficient between chip and tool should be as small as possible.
3. The shape of the tool to ensure smooth chip discharge and easy to heat.
4. The tool should have higher strength and impact toughness.
In the actual production, according to the physical and mechanical properties of the actual workpiece material and the characteristics of the processing process, the correct selection of tool material, coating, optimization of geometric parameters and tool structure, and pay attention to the cutting properties of the tool material relative to the workpiece material, in order to design and manufacture suitable for dry cutting tools.
When dry cutting tool material is more important is must have a high red hardness and high impact resistance. At present, the cutting tool materials used for dry processing mainly include ultrafine cemented carbide, coated cemented carbide, ceramics, diamond, cubic boron nitride and so on.
Dry processing is the trend of future cutting, but if the dry processing supplemented by a small amount of lubricating oil will get better results, that is, we often say trace lubrication processing.
Environmental benefits
After the trace lubrication device replaces the coolant lubrication system, the discharge of waste liquid is greatly reduced, which meets the requirements of energy-saving, consumption reduction and emission reduction advocated by the state, and realizes the friendliness to the environment.
