For machining, tool and machine tools. Required relative motion in the machine tool and the workpiece. Cutting tool in relative motion, which as a tool, both have good material, but also has advanced reasonable geometric shapes. Turning blades, materials including the base material and coating materials, geometry and chip breaker design are closely related. Users need to focus on improving the efficiency of cutting steel, stability, but also wider generality, we should be in a different direction to develop new advanced products they need. Meet their individual needs, to illustrate some of the common questions below, explains later.
Blades are mainly in the form of injury to wear and tear (tipping). Coating hardness and thickness directly influence of blade wear. Coated blades withstand impact damage resistance of the ductile impact. Cutting blade surface formation and continues processing, were forced to shed may also result in wear and tear. Heat-resistant coating material good chemical stability, and the worse the compatibility of the material to be cut, it is not easy to have a bond and the corresponding damage. Coating of thermal conductivity is also important, it is the coating material generates heat in the processing of export capacity, low thermal conductivity values, heat poor export capacity, making it difficult for heat incoming blade reduces its wear.
Substrate materials such as carbide coated several hard material, cutting tool can be obtained, not only has the toughness of the matrix material and the mix of the high hardness of the coating of hard material. Blade thickness coating thickness does not exceed 0.2 to, it makes the blade cutting tool the cutting performance of a great deal of change and improvement. Coated blade tool used more and more widely. Different conditions, deposition of different coating. Under a variety of conditions can improve the cutting efficiency, extend tool life. Coated blade-free tool now used only for some special bonding process and non-ferrous metals processing, and low cost applications.
Coating of chemical vapor deposition CVD (Chemical Vapor Diposition) and Physical Vapor Deposition PVD (Physical Vapor Diposition) in two ways. Basic principle of CVD coating at high temperature (900-1100) furnace, into compounds containing gases, making it in chemical reactions on the surface of the object to be coated, and before it is deposited on the surface of rigid material. PVD coating of the principle is to use a vacuum attachment, deposition, sputtering, ion mixing and other physical methods, at a relatively low temperature (100-700) under the condition of rigid material deposited on painted objects.
CVD coating due to the high temperature, it is only applied to the substrate materials as can bear high temperature. CVD coating and substrate adhesion, can form a thick coating. By replacing the raw gas, can also be in the same furnace, continuous coating substances. It can be used at high speed, feed, large depth of cut per unit time requires metal removal bulky case. Cutting with a blade main coating deposited by CVD method, to improve the cutting performance. Because unlike thermal expansion coefficient of substrate material, easy to produce tensile residual stress. This bad for fatigue resistance of blade breakage resistance. Advantages of PVD coatings are available in low temperature conditions, coating, so the matrix heat resistance requirements, coated blade strength and toughness do not reduce coating is thin, coated membrane produces compressive residual stress, breakage resistance with good fatigue resistance. According to ISO international standards, blades for cutting steel materials marked as p, cast iron, stainless steel, m k, heat-resistant steel, nonferrous metal n to s, high hard steel for h. According to the properties of each material component was divided into 01,10,20,30,40 categories. Number the smaller the hard, bigger is tough. Such as blades for cutting steel material for injection; P01,P10..... P40, remaining the same. For different materials cutting conditions, application and different codes for some blade materials to processing.
Firstly, Mitsubishi introduced the newly developed for high efficiency, high stability MC6000 series CVD coatings for steel turning the blade. Including appropriate hardness (P10) MC6015 coating; proper cutting hardened steel (P20), common good, both must have the hardness and toughness of MC6025; suitable cutting continued surface toughness (P30-P40) MC6035 coated blade.
Started CVD coating only a single layer of TiC,TiN. After a double and multilayer. Later came to include robust thick-film nano-structure multi-layer. Each floor has its corresponding functions.