Forming method and characteristics of plastic surface thread of injection mold


1. Direct molding during molding: simple processing, lo […]

1. Direct molding during molding: simple processing, low cost and short production cycle. However, the plastic strength is poor and the precision level is low.
2. Machining after forming: secondary processing is required after thread forming, and the production efficiency is low. Generally, it is used in the case of difficult thread forming by direct molding, such as: small and deep thread diameter, thread core rigidity and strength Not enough, or the need to install a threaded core on the side, resulting in a complex mold structure.
3. Metal thread inserts: Metal inserts have high precision and good strength. However, when molding plastic parts, stress is easily concentrated around the inserts. Due to the processing of inserts and inserts, the production cycle increases and the cost increases. It is generally used in threads that require high precision and are often assembled and disassembled and subjected to large forces.
For example, when using direct-formed threads, the thread is too thin, which will result in insufficient strength. Therefore, the size of the teeth should be limited. The fine-threaded threads should not be directly formed, but metal-threaded inserts should be used.