Fastener failure can be said to be a troublesome problem in the use of fasteners. In addition to failures caused by improper use, there are also potential risks of failure in the production process of fasteners.

To identify potential failure modes during the production process and take corresponding measures to prevent bolt failure is what every fastener manufacturer needs to do.

Here, let’s talk about how to prevent bolt failure from the source of fastener production: raw material incoming factory inspection.

During the inspection of raw materials entering the factory, there are three main potential failure modes: raw material specifications do not meet requirements; the composition of raw materials is unqualified; and there are cracks on the surface of raw materials.

There are also three consequences corresponding to these three failure modes: raw materials cannot be used or the number of drawings needs to be increased; unqualified raw material composition will affect the performance of the product and cannot meet customer needs; during the cold heading process of bolts produced from raw materials with cracks on the surface Will crack, affecting the appearance of the fastener.

Possible reasons for these three potential failure modes include: mistakes in the procurement process, and the purchased raw materials do not meet the specifications; the material quality of the raw material supplier is out of control; there are small cracks on the raw material billets.

In order to avoid bolt failure due to raw materials, corresponding control measures can be taken during the inspection of raw materials entering the factory: for the inspection of raw material specifications, a vernier caliper can be used to measure the wire diameter, and each plate of raw materials is randomly inspected to check the material wire diameter; for raw materials The composition of the raw materials can be checked with a direct reading spectrometer according to the random inspection of 2 pieces of raw materials per batch to check whether the chemical composition is qualified; the surface cracks of the raw materials can be controlled through manual visual inspection, such as visual inspection of the appearance quality of each plate of raw materials.

In addition, the raw materials used in fastener production must be kept in first-in, first-out inventory for later inspection; unqualified raw materials must be isolated and marked, and the supplier must be reworked or returned.