In the production process of high-intensity manufacturing, if the process is not properly formulated, the equipment mold or the process quality control is not strict, there will be some fatal quality problems.
These problems have a great impact on the final quality of high-strength bolts, and some may even lead to early failure of fastening joints and major quality accidents. Therefore, these quality defects must be controlled during the manufacturing process.
Today, Screwman introduces the types, causes and consequences of fatal problems from the entire manufacturing process.
1. Introduction to the manufacturing process of high-strength bolts
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12.9-grade bolt manufacturing process, material transformation, cold (hot) upsetting blank, thread rolling, thread rolling, heat treatment, surface treatment, finished product packaging.
Second, the causes and consequences of fatal quality problems in the manufacturing process of high-strength bolts
Material restructuring process
The following table lists the various fatal quality problems that are prone to occur in the process of material restructuring, and strict quality control must be carried out.
Cold heading process
The following table lists the various fatal quality problems that are prone to occur during the cold heading forming process, and strict quality control must be carried out. 
Hot upsetting process
The following table lists the various fatal quality problems that are prone to occur in the hot heading process and must be subject to strict quality control.
Thread rolling process
The following table lists the various fatal quality problems that are prone to occur in the threading process, and strict quality control must be carried out.
Heat treatment processHeat treatment is a key process in the manufacture of high-strength bolts, and the following table lists the various fatal quality problems generated in the heat treatment process. These have a great impact on the service life of the bolt and must be controlled.
Surface treatment processSurface treatment is another key process in the manufacture of high-strength bolts, and the following table lists the various fatal quality problems that arise during the surface treatment process. These have a great impact on the service life of the bolt and must be controlled.
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