Explain the method of inserting nuts for custom plastic parts

 

The hot pressing process for nut insertion is suitable for thermoplastics, with high overall performance and low process cost. Both hot pressing and ultrasonic inlay processes require a pre-formed hole in the custom plastic part in advance.

 

The hole diameter is specified by the nut insertion manufacturer and is slightly smaller than the outer diameter of the nut. The hole can be straight or tapered. The front diameter of the nut is slightly smaller than the hole diameter, which helps to position the insertion part. During the hot pressing process, the nut is heated to a certain temperature by the hot mold.

 

When the nut is inserted into the plastic part, the nut melts a small part of the plastic around the hole. The softened resin flows into the knurled teeth and then solidifies and hardens to form a strong bond with the nut. Because the process is easy to control, relatively low cost, and easy to automate (multiple nuts can be pressed in at a time), the hot pressing process is a common nut inlay process for Custom plastic parts.

 

The cold pressing process is suitable for thermosetting plastics, simple to install, low cost, and only requires a simple press head or press. The cold pressing process may not be as functional as the above types, but it is a very economical option.

 

Because they are easy to install, special equipment is usually not required. Sometimes called "expansion insertion pieces", this type of insertion piece features grooves on the side, which allow it to deform elastically during insertion.

When the screw is screwed in, the side walls of the "expansion insertion piece" are forced outward to form a "bite" contact with the inner wall of the hole. The principle is similar to that of household expansion screws. Higher-performance insertion pieces do not have grooves and require a certain amount of pressure to insert.

 

Although it cannot achieve the bonding strength of other processes, it can still provide a very cost-effective insertion process for custom plastic parts.