Technical Difficulties and Development Prospects of Hot Runner Needle Nozzles
- Details
- Category: Molybdenum knowledge
- Published on 30 March 2015
- Written by limei
- Hits: 231
Technical difficulties of hot runner needle nozzles lies in valve needle, nozzle and cylinder, piston and other parts. Valve needle and nozzle with both freedom of movement, but also to prevent melting material spills to the valve needle work under high temperature and pressure conditions. Not only the surface of the needle valve to be abrasion and corrosion resistance but also a certain stiffness and resistance bend performance. In addition, the valve needle materials, processing and heat treatment and so should have higher requirements. To maximize the use of new materials and new technology makes cylinders and pneumatic components such as piston can move smoothly and reliably at higher temperatures.
Prospects of hot runner needle nozzles can be that: As the nozzle needle is especially suitable for applications that require high injection pressure and high viscosity of the material, so in such as cell phone case, automotive interior trim, compact discs, PET preforms, forming large appliances respect, hot runner, especially needle-type nozzle applications continue to expand. Die CAD / CAM technology, application development and standardization heating hot runner components, hot runner technology more scientific and reasonable. CAE technology in particular rely on the hot runner melt body flow simulation for analysis, to achieve a more scientific and accurate on the manifold runner distribution, size, feed inlet location optimization confirmation. And to be adjusted according to the results of the analysis (such as needle-type nozzle needle valve opening and closing timing of the opening sequence, etc.), injection products to meet the increasing requirements for quality and precision machining processes.
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