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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.

Wococarbide

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