The process of insert molding requires strict control over the precision of each step to avoid issues such as poor bonding and product defects. The core steps are as follows:
Insert pretreatment: Clean, degrease, and perform rust prevention treatment on the inserts. Some metal inserts require surface roughening or electroplating treatment to enhance their bonding strength with plastic.
Insert positioning: Precisely place the pre-processed inserts into the positioning pins, slots, and other mechanisms of the mold, ensuring that the positional tolerance is controlled within the range of 0.02-0.05mm.
Mold clamping and injection molding: After the mold is closed, molten plastic is injected according to the set temperature and pressure parameters. The injection pressure needs to be adapted to the insert material to avoid damaging the insert or causing plastic overflow.
Cooling and solidification: Based on the difference in thermal expansion coefficients between the plastic and the insert, set a reasonable cooling time to prevent internal stress or cracking caused by uneven shrinkage.
Demolding and post-processing: After demolding the product, remove excess parts such as sprues and fins. If necessary, conduct appearance inspection and bonding strength testing.
