The lens mold
A lot of die factory when doing this kind of mold think very simple, do not pay attention to at all, wait until the mold finished to discover not so return a responsibility!
The injection molding of PMMA is actually very troublesome. There are many experiences. According to the experience of designing and manufacturing many kinds of cellphone lenses, various panels and buttons, etc.
1. According to the size and thickness of the product, as well as the amount of injection molding machine, the number of mold cavities can be determined. It is not good to have too many of them.
2. It is very important to do mold flow analysis before design;It's easy to adjust the air striations and sol marks when you want to design the production well.
3. Design of exhaust position.
4. Design of flow channel and inlet.
5. The key of PMMA lens mold is polishing.
6. The choice of steel is the most important, otherwise, everything will be well done.It's too late to regret.
7. The mold should be heated at a certain temperature during injection molding.
8. Use special screw rod for plastic machine.
9.Individual lens mold making needs to be strengthened or plating handle.
10.There are some very thin transparent parts that can be injected with nitrogen at high pressure. This is a special machine. Now there are also some parts that are shaped by injection, which are first injected with glue and then sealed with high pressure.