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Advantages and disadvantages of CNC milling machine tool coa

Category:Advantages and disadvantages of CNC milling machine tool coa

Summary:Application of coating tool for milling machine Milling machine coating tool can be used to process different materials of the workpiece, for a variety of carbon structural steel, alloy structural steel, easy cutting steel, tool steel, allo

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Application of coating tool for milling machine
Milling machine coating tool can be used to process different materials of the workpiece, for a variety of carbon structural steel, alloy structural steel, easy cutting steel, tool steel, alloy cast iron and ni-cr stainless steel high speed finishing, general finishing and from light load to heavy load rough machining, can be preferred to choose coating tool; For cast iron and ni-cr stainless steel high speed finishing, general finishing and light load rough machining, it is best to also choose coating tools. So, the utilization rate of steel processing of coating tool is up to 70%.
 
 
There are four types of coated tools: coated carbide tools, coated high speed steel tools, coated ceramic tools, and coated ultra-hard materials such as diamond and cubic boron nitride tools.
 
Advantages of milling machine coating tool
Tungsten steel milling cutter - coated tools due to its excellent cutting performance and the attention of people, it has high surface hardness, good wear resistance, low friction coefficient and low thermal conductivity characteristics, and as chemical barrier and thermal barrier coating material, reduce the diffusion and chemical reaction between the cutter and workpiece, thus reduced the crater wear.
 
Compared with uncoated tools, coated tools can increase the tool life by more than 3~5 times, improve the machining accuracy 0. Level 5~1, reduce tool consumption by 20%~50%. The durability of coated carbide cutting tools can be increased by 2~10 times. If the durability remains unchanged, the cutting speed can be increased by 25%~70%. The durability of coated HSS tools can be increased by 2 to 5 times or even 10 times. Since the advent of coating tools, not only tool coating technology has made rapid development, coating more and more types. The coating tool used in industrial developed countries in the cutting tool accounted for an increasing proportion, about 70%~80%, coating tool has become the symbol of modern tool products.
 
Disadvantages of milling machine coating tool
Milling machine coating tool has many advantages, and the use of more and more, but can not completely replace the ordinary uncoated tool:
 
(1) due to the hardness of the carbide tool after the coating, the coating tool is not suitable for particularly heavy load rough machining and large impact intermittent cutting.
(2) in order to increase the strength of the blade of the coated tool, the tool before coating should be treated with a blunt circle blade, the radius of the blunt circle is generally 20~80um, the strength of the blade increases with the increase of the radius of the blunt circle, so it is not as sharp as the blade of the uncoated tool. The radius rn of the blunt edge of a carbide tool coated with CVD method is generally 0. 02 ~ 0. 07mm, PVD coated carbide tool blade blunt circle radius rn although smaller, but generally not less than 0. 02mm, which makes the coating tool unsuitable for small feed, such as 0. 015mm finishing, not suitable for micro finishing.
(3) the coating tool in low speed cutting, easy to produce peeling and breakage phenomenon, so it is not suitable for low speed cutting range.
(4) coated tools is not recommended for the following material processing: high temperature alloy, such as nickel base and cobalt base and iron base alloy), heat-resistant steel and titanium alloy and non-metallic materials, such as graphite, glass fiber, nylon and plastic), non-ferrous metals and alloys, such as the free cutting brass, bronze, nickel, silver, pure copper, manganese, zinc alloy) and difficult to machining non-ferrous alloy, such as aluminum bronze alloy, silicon aluminum alloy, manganese bronze alloy, monel alloy and nickel copper alloy), etc.
(5) coated tools are also not suitable for processing high-hardness materials, such as steel over 300HIB, chilled cast iron and hard inclusion materials.
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