Insert moulding, in which an insert is set in the mould and moulded at the same time as the injection moulding process, can be regarded as an essential moulding technology for mass production as it does not require any post-processing.
Insert moulding can be said to be an essential moulding technology for mass production as it does not require any post-processing.
In order to perform insert moulding, it is necessary to consider the dimensional tolerances of the collar and nut to be inserted.
For example, the outer shape of the collar must be 12 mm in diameter.
For example, if the outer shape of the collar is ø 12 ± 0.1 ...
The moulding die must be made to the highest tolerance of the collar outer shape (∅ 12.1).
This is because if the mould is made with a diameter of 12.0, there is a possibility that the collar will not fit when the diameter is 12.1.
So what happens if a collar with a diameter of 11.9 to 12.0 is inserted when the mould is made with a diameter of 12.1?
In many cases, the resin will enter through the gap in the collar outer diameter.
In some cases, this level of leakage is OK, but in other cases it is NG because it doesn't look good depending on the product...
However, removing resin leaks will eventually increase the number of post-moulding processes. However, inspecting all inserts is costly and time-consuming.
In this case, we suggest covering the top surface of the insert with resin.
Covering the outer circumference with resin gives a clean appearance.
In some cases, it may not be acceptable to cover the outer circumference with resin due to specifications, but if there are no specific instructions, the product shape is changed to this type of product and mass production is considered.
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