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Structural design of tungsten carbide nozzle:
Tungsten carbide nozzle is processed by precision machinery and tungsten carbide material (super hard alloy). The bending resistance reaches 2300N/mm, and the hardness reaches HRA90 degrees. When processing tungsten carbide nozzles, we do precision grinding and surface treatment to achieve a hole roughness of Ra0.1 and a roughness of Ra0.025 at both ends. There is a scientific curvature radius design at the two entrances. This design can ensure the smooth passage of the thread. Due to the overall material processing, there is no elevation angle on the drill hole. Compared with the ruby nozzle, the phenomenon of easy bending and clogging has been improved.
Tungsten carbide alloy ball and valve seat are high temperature sintered alloy materials composed of refractory metal WC and cemented metal Co or Ni.
The alloy has high hardness and good wear resistance. At room temperature, it has good rigidity, no obvious plastic deformation, and small thermal expansion coefficient. The product has good dimensional stability and high processing accuracy. The WC-Ni-based alloy has good chemical stability and is resistant to acid and alkali corrosion, thereby increasing the service life of the product. Due to the above characteristics of cemented carbide, it is widely used in ball rolling elements in the bearing industry, rotating balls for fluid sealing, pump spools, one-way spools and valve seats for oil mining machines, and many other military and civilian high-tech fields. The cemented carbide balls and valve seats produced by wococarbide.com are mainly sold to the United States, Japan, the European Union and other countries and regions. The annual sales can reach dozens of tons, nearly a hundred specifications, and more than tens of millions of grains. According to the specific needs of users, we can design and produce tungsten carbide alloy ball products with different composition, performance and use requirements. The purpose of the company: quality first, reputation first, make friends and serve customers wholeheartedly.
SLS is called Selective Laser Sintering. SLS technology uses laser to irradiate the material powder and melt the special added materials to achieve the function of binder, so as to combine the metal powder to achieve metal printing.
SLM is called Selective Laser Melting. SLM technology is the technology that the metal powder is directly heated by the laser to melt completely in the cooling process.
The principle of these two technologies is to use the thermal effect of the laser beam, but because SLS and SLM laser work on different objects, they use different lasers. SLS technology is generally used in long wavelength (9.2-10.8 μ m) CO2 laser. In order to melt metal better, SLM technology needs to use laser beam with higher absorptivity of metal, so it generally uses Nd YAG laser (1.064 μ m) and fiber laser (1.09 μ m) with shorter wavelength.
From the material point of view, there is a big difference between the two technologies. In addition to the main metal powder, the materials used in SLS technology also need to add a certain proportion of binder powder. The binder powder is usually metal powder with low melting point or organic resin. SLM technology can make the material melt completely, so it usually uses pure metal powder. Because the powder of SLS technology is mixed powder, even if metal powder is used as binder, the strength of metal materials with low melting point is generally lower, so the strength of sintered parts of SLS technology is lower than that of parts with single metal material. In addition, the mechanical properties and forming accuracy of SLS sintered parts are worse than SLM due to the existence of voids.
When the hard alloy die tools thermosetting plastic is compressed and die toolsed, it must be kept under a certain temperature and pressure for a certain period of time to make it fully cross-linked and solidified to become a plastic part with excellent performance. This time is called the compression time. The compression time is related to the type of plastic (type of resin, volatile content, etc.), shape of the plastic part, process conditions (temperature, pressure) of compression mould, and operation steps (whether exhaust, pre-pressing, pre-heating), etc. As the compression mould temperature increases, the curing speed of the plastic increases, and the required compression time decreases. Therefore, the compression cycle will decrease with the increase of the die tools temperature. The influence of compression mould pressure on mould time is not as obvious as mould temperature, but as the pressure increases, the compression time will decrease slightly. Since preheating reduces the plastic filling and die tools opening time, the compression time is shorter than that without preheating. Usually, the compression time will increase with the increase of the thickness of the plastic part.
Cemented carbide mould
The compression time of cemented carbide die tools has a great influence on the performance of plastic parts. If the compression time is too short and the plastic is not hardened enough, the appearance performance of the plastic part will be deteriorated, the mechanical performance will be reduced, and the plastic part will be easily deformed. Properly increasing the compression time can reduce the shrinkage of plastic parts and improve the heat resistance and other physical and mechanical properties of the cemented carbide die tools. However, if the compression time is too long, not only will the productivity be reduced, but the shrinkage of the plastic part will increase due to excessive resin crosslinking, resulting in stress, resulting in a decrease in the mechanical properties of the plastic part, and in severe cases, the plastic part will be broken. The compression time of general phenolic plastic is 1~2min, and that of silicone plastic is 2~7min.
What are the principles for the selection of cemented carbide die tools materials?
1) Should meet the performance requirements of cemented carbide die toolss, there must be sufficient strength, hardness, plasticity, toughness, etc., to meet the working conditions, failure modes, life requirements, reliability, etc. of cemented carbide die toolss.
2) Should have good processing properties The selected materials should have good processing properties according to different manufacturing processes.
3) The market supply situation should be considered. Market resources and actual supply situation should be considered, try to solve the problem domestically, import less, and the varieties and specifications should be relatively concentrated.
4) Cemented carbide die toolss should be economical and reasonable to choose low-priced materials as far as possible while meeting the performance and use conditions.