Master advanced heat treatment technology to produce high-quality high-strength fasteners

The heat treatment process has a vital influence on high-strength fasteners, especially its intrinsic quality. Therefore, in order to produce high-quality high-strength fasteners, advanced heat treatment technology and heat treatment process control are necessary.

Heat treatment can make high-strength fasteners have certain strength, good plasticity, toughness, low notch sensitivity and high bending strength required by the design, and avoid the relaxation phenomenon and other comprehensive mechanical properties and use performance , So as to ensure the quality and reliability of fasteners and improve the market competitiveness of fastener products.

The heat treatment process is characterized by changing the internal structure of the material to obtain the required performance and quality of various fasteners. The material or the shape of the fastener is usually not changed during the process. Since the quality characteristics of the products given by the heat treatment are often unintuitive internal qualities (such as the tensile strength of the material, the reduction of area, the elongation, etc.), in order to ensure the quality of the heat treatment during the production, the fasteners are generally adjusted by special equipment. Or testing with the furnace sample, but due to the limitation of the inspection sampling rate and the inspection location, the inspection is partial or individual for each specification of fasteners or even the fasteners of each furnace. It is difficult to detect 100% of the heat treatment quality. Therefore, all test results cannot fully reflect the heat treatment quality of the entire batch of fasteners or the entire fastener.

As heat treatment production is put into batches according to the number of furnaces or continuous production, once heat treatment quality problems occur, all previous efforts will be discarded, causing great losses. If heat treatment defects are missed, serious mechanical failures are prone to occur, causing incalculable losses. Therefore, it is particularly important for the heat treatment process to strictly control the whole process of heat treatment production and implement comprehensive quality management. It is of special significance to carry out the ISO9000 series certification work in the fastener industry, and it has received universal attention. Heat treatment production is inseparable from the four elements of man, machine, material, and method (Man, Machine, Material, Method, referred to as 4M) just like other production processes. Environmental protection is not considered here. They are the main factors that affect the quality of heat treatment products. , Mutual influence, mutual restriction, and ultimately determine the quality of heat treatment of fasteners.