Our Stainless Steel Wire Mesh products are generally made of stainless steel Type 302, 304, 304L, 316, 316L, 321 and 430 etc. We produce wire cloth in all kinds of forms. The weaving is
determined according to our customers` specific requirements, such as the material,
the wire diameter, the size of the mesh, width and length.
Popular weaving types we use
for wire mesh cloth: plain weave, twilled weave, dutch plain weave, dutch twilled weave, reverse weave, five heddle weave.
Stainless
steel mesh is widely used in mining, chemical, food, pharmaceutical and
other industries, such as Filter Mesh Net, protective nets, kitchen
baskets, etc.
Stainless Steel Mesh,Stainless Steel Net,Plain Weave Stainless Steel Mesh,Stainless Steel Wire Mesh Hebei TongChan Imp.&Exp.Co., Ltd. , https://www.tongchanmesh.com
Chemical or physical methods to form a film on the surface of the tool, so that the cutting tool can obtain excellent comprehensive cutting performance to meet the requirements of high-speed machining; since the advent of hard coated tools in the early 1970s, chemical vapor deposition ( CVD) technology and physical vapor deposition (PVD) technology have been developed one after another, opening a new chapter in the history of tool performance. Compared with uncoated tools, coated tools have significant advantages: they can greatly improve the cutting tool life; effectively improve the cutting efficiency; improve the machining accuracy and significantly improve the surface quality of the workpiece being processed; effectively reduce the tool The consumption of materials reduces the processing cost; reduces the use of coolant, reduces costs, and is environmentally friendly.
Second, the characteristics of the tool coating:
1, using coating technology can greatly improve the surface hardness of the tool without reducing the strength of the tool, the hardness currently achieved is close to 100GPa;
2. With the rapid development of coating technology, the chemical stability and high-temperature oxidation resistance of the film are more prominent, which makes high-speed cutting processing possible.
3. Lubricating film has good solid phase lubrication performance, which can effectively improve the processing quality, and is also suitable for dry cutting processing;
4. Coating technology, as the final process of tool manufacturing, has almost no impact on tool accuracy and can be used for repeated coating processes.
Third, commonly used coatings
1, titanium nitride coating: Titanium nitride (TiN) is a general-purpose PVD coating, which can improve the hardness of the tool and has a higher oxidation temperature. This coating is used for high speed steel cutting tools or forming tools for very good machining results.
2, chromium nitride coating: CrN coating good adhesion resistance makes it the preferred coating in the processing of built-up edge. With this almost invisible coating, the processing properties of HSS tools or carbide tools and forming tools will be greatly improved.
3, diamond coated CVD diamond coating can provide the best performance for non-ferrous metal processing tools, is the ideal coating for processing graphite, metal matrix composite (MMC), high silicon aluminum alloy and many other high abrasive materials (note : Pure diamond coated tools cannot be used to machine steel, because a large amount of cutting heat is generated when machining steel parts, and a chemical reaction occurs, which causes the adhesion layer between the coating and the tool to be damaged).
4. Titanium Nitride Coating: The carbon added in the titanium nitride (TiCN) coating improves the hardness of the tool and achieves better surface lubricity. It is an ideal coating for high speed steel tools.
5. Nitrogen aluminum titanium or titanium aluminum nitride coating (TiAlN/AlTiN): The aluminum oxide layer formed in the TiAlN/AlTiN coating can effectively improve the high temperature processing life of the tool. This coating is available for cemented carbide tools primarily used for dry or semi-dry machining. Depending on the ratio of aluminum to titanium contained in the coating, the AlTiN coating provides a higher surface hardness than the TiAlN coating, making it a viable coating option for high speed machining.
Four: coating technology and tool coating knowledge
1, Titanium Nitride (TiCN) coating has higher hardness than Titanium Nitride (TiN) coating. Due to the increased carbon content, the hardness of the TiCN coating is increased by 33%, and the hardness varies from about Hv3000 to 4000 (depending on the manufacturer).
2, CVD diamond coating: CVD diamond coating with surface hardness up to Hv9000 has been matured on the tool. Compared with PVD coated tool, the life of CVD diamond coated tool is increased by 10-20 times. The high hardness of the diamond-coated tool allows the cutting speed to be increased by 2-3 times compared to the uncoated tool, so that the CVD diamond oxidation temperature refers to the temperature at which the coating begins to decompose. The higher the oxidation temperature value, the more advantageous the cutting process under high temperature conditions. Although the TiAlN coating may have a lower room temperature hardness than the TiCN coating, it has proven to be much more effective than TiCN in high temperature processing. The reason why the TiAlN coating retains its hardness at high temperatures is that a numerically controlled micro-signal cncdar layer of alumina can be formed between the tool and the chip, and the aluminum oxide layer can transfer heat from the tool to the workpiece or chip. Compared to high-speed steel tools, carbide cutting tools typically have higher cutting speeds, making TiAlN the preferred coating for cemented carbide tools. Carbide drills and end mills typically use this PVDTiAlN coated stone coating. Tools are a good choice for cutting non-ferrous and non-metallic materials.
3, the hard film on the surface of the tool has the following requirements: 1 high hardness, good wear resistance; 2 stable chemical properties, no chemical reaction with the workpiece material; 8 heat and oxidation resistance, low friction coefficient, strong adhesion to the substrate Wait. It is difficult for a single coating material to fully meet the above technical requirements. The development of coating materials has been developed from the initial single TiN coating, TiC coating, TiC-A12O3-TiN composite coating and multi-composite coatings such as TiCN and TiAlN. Now the latest development of TiN/NbN, TiN/CN, and other multi-component composite film materials have greatly improved the performance of tool coatings.
4, in the manufacturing process of coated tools, generally according to the hardness of the coating, wear resistance, high temperature oxidation resistance, lubricity and anti-adhesion, etc., where the coating oxidation is the most cutting temperature Directly related technical conditions. The oxidation temperature refers to the temperature value at which the coating starts to decompose, and the higher the oxidation temperature value, the more advantageous the cutting process under high temperature conditions. Although the TiAlN coating may have a lower room temperature hardness than the TiCN coating, it has proven to be much more effective than TiCN in high temperature processing. The reason why the TiAlN coating retains its hardness at high temperatures is the formation of a layer of alumina between the tool and the chip, which transfers heat from the tool to the workpiece or chip. Compared with high-speed steel tools, carbide cutting tools usually have higher cutting speeds, which makes TiAlN the preferred coating for cemented carbide tools. Carbide drills and end mills usually use this PVDTiAlN coating.
5, from the application technology point of view: in addition to cutting temperature, cutting depth, cutting speed and coolant may have an impact on the application of the tool coating.
V. Progress of commonly used coating materials and super-hard coating technology
Among the hard coating materials, TiN is the most mature and widely used process. At present, the use rate of TiN coated high speed steel tools in industrialized countries has accounted for 50% to 70% of high speed steel tools, and the use rate of some non-reground complex tools has exceeded 90%. Due to the high technical requirements of modern metal cutting tools, TiN coatings are increasingly unsuitable. The TiN coating has poor oxidation resistance. When the temperature is up to 500 ° C, the film is obviously oxidized and ablated, and its hardness can not meet the needs. TiC has a high microhardness, so the wear resistance of the material is good. At the same time, it adheres firmly to the substrate. When preparing a multi-layer wear-resistant coating, TiC is often used as the underlying film in contact with the substrate, which is a very common coating material in coating tools.
The development of TiCN and TiAlN has brought the performance of coated tools to a higher level. TiCN can reduce the internal stress of the coating, improve the toughness of the coating, increase the thickness of the coating, prevent the crack from spreading, and reduce the chipping of the tool. Setting TiCN as the primary wear layer of the coated tool significantly increases tool life. TiAlN has good chemical stability and anti-oxidation wear. When processing high-alloy steel, stainless steel, alloy, and nickel alloy, it has a life expectancy of 3-4 times that of TiN coated tools. If there is a high Al concentration in the TiAlN coating, a very thin non-state A12O3 is formed on the surface of the coating during cutting to form a hard inert protective film, which can be used more effectively. High-speed machining. The oxygen-doped titanium-titanium carbide TiCNO has high microhardness and chemical stability and can produce a coating equivalent to the TiC ten A12O3 composite coating.
Among the above hard film materials, there are three types in which the microhardness HV can exceed 50 GPa: a diamond film, cubic boron nitride CBN, and carbon nitride.
Many deposited diamond films require temperatures from 600 ° C to 900 ° C, so this technique is commonly used to deposit diamond films on the surface of cemented carbide tools. The commercialization of diamond carbide tools is a major achievement in coating technology in recent years.
CBN is second only to diamond in terms of hardness and thermal conductivity, and has excellent thermal stability. It does not oxidize when heated to 1000 ° C in the atmosphere. CBN has extremely stable chemical properties for iron group metals. Unlike diamond, which is not suitable for processing steel, it can be widely used in the finishing and grinding of steel products. In addition to excellent wear resistance, CBN coating can process heat-resistant steel, titanium alloy and hardened steel at a relatively high cutting speed. It can cut high-hardness chill rolls, carbon-doped materials and tool wear. Very severe Si-Al alloys, etc. The methods for synthesizing CBN thin films by low pressure gas phase mainly include CVD and PVD methods. CVD includes chemical transport PCVD, hot wire assisted heating PCVD, ECR-CVD, etc.; PVD has reactive ion beam plating, active reactive evaporation, laser evaporation ion beam assisted deposition, and the like. CBN synthesis technology has a lot of work to do in basic research and application technology, including reaction mechanism and film formation process, plasma diagnosis and mass spectrometry, determination of optimal process conditions, and development of high-efficiency equipment.
It is possible for carbon nitride to have a hardness that meets or exceeds the diamond. The success of synthesizing carbon nitride is an outstanding example of molecular engineering. Carbon nitride as a superhard material is expected to have many other valuable physicochemical properties. Studying carbon chloride has become a hot topic in the world of materials science. 
Research on Diamond, Carbon Nitride and CBN Tool Coating Technology
Abstract 1. The tool coating forms a certain film on the surface of the tool by chemical or physical means, so that the cutting tool can obtain excellent comprehensive cutting performance to meet the requirements of high-speed machining. Since the early 1970s, hard-coated tools have been introduced. Since, chemical vapor deposition (CVD...
First, the tool coating