Use cemented carbide tools whenever possible.
For example, tungsten cobalt cemented carbide has low chemical affinity, good thermal conductivity and high strength with titanium alloy. For intermittent cutting at low speed, ultra-fine Grain Cemented Carbide with impact resistance can be selected. High speed steel with good high temperature performance can be used for forming and complex tools. A smaller rake angle and a larger rake angle are used to increase the contact length between the chip and the rake face and reduce the friction between the workpiece and the rake face. The tool tip adopts a circular arc transition edge to improve the strength and avoid sharp corner burning and edge collapse. Keep the blade sharp to ensure smooth chip removal and avoid chip sticking and breaking. The cutting speed should be low to avoid excessive cutting temperature; The feed rate is moderate. If it is too large, it is easy to burn the knife. If it is too small, the knife edge will wear too fast due to working in the work hardening layer; The cutting depth can be large, so that the tool tip can work below the hardened layer, which is conducive to improving the tool durability. During machining, the selection of cutting fluid is very important. Chlorine will aggravate surface hardening and produce intergranular corrosion. Therefore, it is best for aqueous products to be free of chlorine.
The best scheme is to choose vegetable oil-based cutting fluid.
Vegetable oil based cutting fluid. In the field of machining application, the introduction of vegetable oil-based coolant can comprehensively improve the mechanical cutting performance. As a proven technology, vegetable oil has been considered to have super lubricating properties since 1960s. At that time, only mineral oil-based coolant containing various additives could be selected as machining lubricant. Today, a new generation of emulsifiers and stabilizers make vegetable oil-based coolants practical applications in various machining applications. Because this kind of coolant is used in the processing process, the productivity is also greatly improved. It is reported that it is common to increase productivity by 20% to 30%. In addition, the service life of the tool is also increased by more than 50%. Vasco series vegetable oil-based cutting fluid and vascomill series vegetable oil-based cutting oil have been introduced since the 1990s. Efforts in processing stability and maintaining high lubricity in processing have been tested. Because vegetable oil-based cutting fluid has bipolar molecular structure, its lubrication effect is better than mineral oil-based cutting fluid, which significantly improves the cutting speed and prolongs the durability of cutting tools. Some enterprises feedback that the service life of tools has even doubled. In addition, its stability in the machining process is also higher than that of other cutting fluids. Due to slow wear, it ensures that the machining accuracy of the last workpiece processed in batch is the same as that of the first workpiece.
The high lubricating performance of vegetable oil is determined by the basic components of vegetable oil molecules and its own chemical structure. The lubricating performance of vegetable oil-based coolant comes from the inherent "oiliness" of vegetable oil components, which is directly caused by the "smart molecules" of vegetable oil. This kind of molecule is very long, heavy and bipolar, that is, the two ends of the molecule have opposite charges. The two "extremes" of molecules have strong chemical affinity for the metal surface. They are tightly adsorbed on the metal surface like tiny magnets. Vegetable oil molecules are vertically, closely and evenly arranged on the metal surface, resulting in the formation of a thick, strong and durable lubricating film on its surface.
Comparison of oil film arrangement between mineral oil-based and vegetable oil-based.
On the contrary, the molecules of mineral oil are nonpolar. Their distribution on the surface of titanium is irregular, so the lubricating layer is relatively weak. The higher the viscosity temperature index of vegetable oil, the more stable lubrication characteristics in the operating temperature range can be guaranteed. With the increase of processing temperature, the viscosity of vegetable oil decreases slower than that of mineral oil. On the contrary, with the decrease of temperature, the liquid fluidity of vegetable oil is better than that of mineral oil, which is conducive to separation from chips and workpieces. And its high melting point is conducive to improve the metal cutting rate, reduce the formation of smoke and reduce the risk of fire. The size of vegetable oil molecules is very uniform, while the size of mineral oil molecules varies widely. Therefore, the physical properties of mineral oil, such as its viscosity at evaporation and boiling point, are greatly affected, while the loss of vegetable oil caused by evaporation and atomization is very low. This can create a healthy and clean working environment for people.Envoyer à ce fournisseur
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