Many people have their own popular names. Although they have the same meaning, they have different understandings.

Some titles are not professional titles (I feel that these words of the landlord are very irregular).

My own understanding:

Back-off: For some molds with special requirements for demoulding, some external auxiliary demoulding mechanisms will be added. Reverse buckle is one of them.

Knock-through: If the hole of the finished product is through, it will be closely fitted between cores, cores and cavities, and cavities and cavities in the mold.

Inclined top: Generally, the push-out mechanism (straight rod type) will be called push rod, and the common saying is "ejector rod".

Normal ejection is perpendicular to the template surface, but some special-shaped parts will adopt angular ejection mechanism.

By the way: this word is called irregular. I understand that it is similar to "touch through", except that it is not face to face, but the core passes through the other side.

I wonder if there is a big difference between what I understand and what the landlord understands.