Three related elements to improve the efficiency of micro-tools

Three related elements to improve the efficiency of micro-tools include the optimization of micro-tools, the use of low viscosity coolant and high-speed cutting technology.

(1) micro-tool design

It is often difficult to achieve efficient feeding and to achieve satisfactory machining accuracy by simply minimizing the geometric parameters of the larger diameter tool. Because with the tool diameter decreases and the spindle speed increases, the requirements of the tool is also changing. Conventional tool design with a clip blade is not suitable for machining the micro tool. This is mainly because the need to improve the speed of the tool is not limited to the reduction of the tool diameter. The increase in speed requires that the tool has a better balance and a larger chip space to ensure smooth chip removal and prevent the formation of BUE. The use of micro-tools for efficient high-speed machining requires special optimization of the tool design. The correct geometry of the micro tool with the high-speed spindle machine and a reasonable cooling method can be completely canceled for the removal of burrs and secondary processing.

(2) Optimization of cooling mode

With high-speed machining of micro-tools, a lot of cutting heat is generated, so some measures are required to cool the cooling. While high speed cutting has some advantages in reducing cutting heat, high speed cutting techniques are sometimes not enough to completely solve the cooling problem, so there is still a need for an effective cooling system for some machining.

The cooling system eliminates the heat of cutting and can also lubricate so that the tool can be quickly cut on the surface of the workpiece. Trying to cut a piece of cold butter with a cold knife is a very difficult thing, because the knife cut off the surface of the butter when the lack of lubrication. But if the knife is heated, it can melt a little butter, so as to provide lubrication for the knife, making it easy to cut butter. High speed cutting with a tool is the same principle. Micro-tools require a lubricant with a lower viscosity than water because of the need to allow the coolant to reach the cutting edge of the high-speed rotating tool. The viscosity of the milk-based coolant is greater than that of the water-based coolant and is therefore unsuitable for use as a lubricant for micro-tool high-speed machining.

The micro-spray cooling system used in the process can use alcohol (ethanol) as the coolant, which is ideal for the cooling and lubrication of non-ferrous metals and certain plastic materials. However, the use of oil-based coolants in the processing of steel-based materials, the benefits of alcohol coolant, does not apply to the processing of steel materials because the carbide tool may cause an instantaneous discharge on the surface of the steel if exposed to ethanol- The liquid may produce a relatively high dynamic potential.

Commonly used spray coolants are usually petroleum-based products, these coolants need to be used after the appropriate recycling, will incur additional costs. And after the use of alcohol all evaporated, so no need to deal with or recycling. Although alcohol is flammable, it has a very low volatility to make it a very effective cooling lubricant for high speed machining. Because alcohol is a natural compound, environmentally friendly, no waste, no cleaning, so there will be no related costs. In addition, the use of alcohol as a cooling lubricant does not leave any grease on the workpiece, so that the secondary operation of the workpiece can be avoided, and the cost of these processes is quite high.

(3) high-speed cutting technology

The smaller the tool diameter, the higher the spindle speed required to effectively cut the workpiece. With the micro-tool for milling, drilling, milling and engraving milling, the use of speed range 6000 - 600r / min high-frequency spindle is ideal. High-speed cutting technology uses a high speed, small step, large feed processing strategy. Imagine moving your hand through the burning candle, if your hand moves slowly, the flames have enough time to burn your hands; and if your hand passes quickly, the flames are too late to burn the skin. The principle of high-speed machining with micro-tools is similar, and when the tool moves fast, the cutting heat is too late to pass into the workpiece and cause problems. What good effective eye cream Taobao Mall sale exfoliating acne products which go black eye freckle what a good brand of cleansing products easy to use lightening creams which brand of good

During the cutting process, the cutter keeps the chips away from the workpiece. Approximately 40% of the resulting cutting heat comes from the friction between the blade and the chip, and about 20% from the deformation (bending) of the chip. Thus, a total of about 60% of the cutting heat comes from the inside of the chip. High-speed cutting technology attempts to take away most of the heat from the chip to achieve cleaner cutting. The higher processing quality is based on good tool cooling, lower cutting forces and consequently reduced machining vibrations.

With a high spindle speed, the chip load can be reduced to less than 0.005 "(0.13mm). Such a small depth of cut can significantly reduce the cutting force between the tool and the workpiece. The heat can be reduced, the tool deviation can be reduced, and the processing of the thin-walled workpiece can be realized.As a result of these advantages, the use of high-speed cutting can get better processing surface quality, cutting temperature is low, easy to clamp the workpiece, machining accuracy Also higher.