SMT nozzles come in a wide variety, categorized by material such as tungsten steel, diamond steel, ceramic, plastic steel, plastic, aluminum, iron, etc. They are also divided by shape into round holes, square holes, V-shaped, and by size into numerous types. How to choose the right nozzle is a common question among new SMT professionals.
Mouthpiece Material:
1. Tungsten Carbide Nozzles: Tungsten carbide nozzles are robust and durable, though they tend to discolor. For those who don't mind the hassle or newcomers to SMT, tungsten carbide nozzles are a great choice. Just use an oil-based pen to touch up any discoloration, and they're ready to use again.
Ceramic Nozzles: Ceramic nozzles do not fade but are brittle and prone to breaking. Careful use can help avoid or minimize breakage.
The Diamond Steel Nozzle: Durable, functional, and doesn't fade, but it's exceptionally expensive and not great in terms of cost-performance.
4. Nozzle Tips: Choose rubber nozzle tips when the material surface is uneven or sticky. However, rubber nozzle tips have a limited lifespan. It's recommended to purchase extra rubber nozzle tips in advance for backup. When the nozzle tips wear out, you can simply replace them yourself.
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Standard-sized materials typically have fixed nozzle specifications. For instance, with Samsung SM, the 0805 material corresponds to the CN065 nozzle, the 0603 material to the CN040 nozzle, and so on. When some materials are neither too large nor too small and have peculiar shapes, customized nozzles are required.
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Mouthpieces come in various shapes such as square holes, round holes, and V-grooves. Custom-made mouthpieces typically select a flat suction point based on the material's shape. Some are designed with elongated shapes to fit into the material's凹槽平面 for suction. Others are made in a zigzag pattern, with flat ends and an uneven middle, requiring a bridge. For materials with adhesive properties that make it difficult to place, slots are cut into the mouthpiece wall or a rubber tip is used.
