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How to extend Knives life?

Update:10-06-2021
Summary:

In order to extend the service life of the Knives, it i […]

In order to extend the service life of the Knives, it is necessary to select the type of metalworking fluid and optimize the processing method, especially for difficult-to-process materials. When cutting difficult-to-machine materials, high-quality cutting fluid is required, and the cost of this cutting fluid is also relatively expensive. However, in the cutting process, difficult-to-machine materials often have an adverse effect on the service life of the Knives. Therefore, it is very necessary to choose a suitable cutting fluid to effectively extend the service life of the Knives and reduce the processing cost. The direct cause of Knives damage is cutting force and cutting heat. Therefore, no matter which processing method is used, the fundamental purpose is to reduce the temperature of the Knives tip of the cutting part and the processed area of ​​the part, and prevent the surface hardening and Knives tip of the processed part. The temperature is too high to increase the heat dissipation area and control the cutting force.
Solution:
1. Properly control the cutting force and cutting speed
Properly controlling the cutting force and cutting speed of the Knives is also one of the most effective means to reduce the temperature of the processing area and extend the service life of the cutting fluid. When processing difficult-to-machine materials, the cutting edge is generally finely ground, and the cutting depth and cutting width should not be too large. When choosing the cutting linear speed, it is necessary to consider factors such as different material types, part structures and processing equipment. In general, if the processing material is a nickel-based alloy, the line speed should be controlled at 20 to 50 meters per minute; the processing material is titanium alloy, and the line speed should be controlled at 30 to 110 meters per minute; the processing material is PH stainless steel, and the line speed It should be controlled within the range of 50 to 120 meters per minute.
2. Choose a reasonable cutting method
For difficult-to-machine materials, choosing different cutting methods has great differences in the damage of cutting fluid. No matter which cutting method you choose, the principle is the same, that is, to reduce the cutting force and temperature in the cutting zone as much as possible. Cycloidal cutting method can reduce the cutting area, so that the actual cutting angle of the cutting fluid is smaller, thereby prolonging the heat dissipation time of each tooth of the Knives, and reducing the cutting temperature; the spiral interpolation method can make the cutting amount of each tooth relatively uniform. Avoid the cutting force concentrated on a few teeth and accelerate the wear. This effect is especially obvious at the corners; and the high-feed cutting method is used to effectively reduce the cutting force with a smaller depth of cut and a larger feed. , So that less cutting heat is generated during processing, and the processing area temperature.
3. Ensure timely and effective chip breaking
In metal processing, a large amount of cutting heat is generally generated on the cutting chips. If the length of the chip can be controlled to ensure timely and effective chip breaking, this part of the cutting heat can be taken away by the chips. Therefore, the chip breaking is to control the cutting temperature. An effective way. When processing difficult-to-process materials, especially in the roughing process, under the premise that the rigidity of the processing system allows, try to make it break the chips during the entire processing process. At the same time, use a cutting fluid with good sedimentation performance to settle and discharge the cutting chips, and do not let the cutting chips rub against the surface of the machined workpiece.
In the selection of cutting fluid, in addition to the performance of the cutting fluid's lubricity and cooling, the performance of the cutting fluid's rust resistance, cost and easy maintenance should also be considered. The cutting oil is easy to choose a base oil with a relatively low viscosity to add anti-friction additives, so that it can achieve lubrication and anti-friction, but also has good cooling and easy filtering. However, the problem with cutting oil is its low flash point. In high-speed cutting, the smoke is heavier, the flash point is low, the risk factor is high, and the volatilization is fast, and the user's use cost is correspondingly high. Therefore, try to choose water-soluble when conditions permit. Cutting fluid.
For water-based cutting fluids, it is important to consider its rust resistance. Nowadays, the commonly used water-based aluminum rust inhibitors include silicate and phosphate grease. For workpieces that have been stored for a long time between procedures, it is easy to use cutting fluids with phosphate grease type rust inhibitors during processing.

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