Division and fit of injection mold inserts

When assembling the divided injection molding mold inserts, the dimensional tolerance of the controlled inserts is out of tolerance, which may lead to the failure to fit into the hole or the large gap. The idea of managing dimensional tolerances between similar parts is called "fit".

As represented by the relationship between shaft and bearing, "fit" is the idea of managing the allowable dimensional tolerance of the clearance between shaft shape and hole shape, which is divided into three fit methods as shown below.

1. Clearance fit

In any combination of shaft dimensional tolerances and hole dimensional tolerances, a clearance fit always occurs.

2. Transition fit

A fit that generates clearance or interference according to the combination of shaft dimensional tolerance and hole dimensional tolerance.

3. Interference fit

In any combination of shaft dimensional tolerance and hole dimensional tolerance, interference fit always occurs.

In addition, for the purpose of machining holes and shafts that fit each other, either of the holes or shafts shall be used as the reference point and the other party shall refer to that reference point. There are two ways. Namely, "hole reference mode" and "axis reference mode". The mission of Fanstar is to master the core technology of injection molding production, communicate and analyze the technology before mold production with customers from the production needs of finished products, so that the mold delivery time is short, the life is long, the mass production is fast and the finished product quality is excellent! Have the need of injection molding mold welcome to contact us!