Anti-loose and anti-corrosion requirements have received more and more attention. For example, the Ministry of Railways has speeded up several times in recent years. It has proposed the use of fasteners with anti-loosening properties on lines and rolling stock to promote the development of anti-loose fasteners in the railway industry. And promotion, the anti-loose performance and surface treatment were also used as basic technical requirements during the bidding for the Qinghai-Tibet Railway last year. For this reason, different pre-plated thread sizes are specified in the standard, which may reduce the joint strength.
The installation quality of fasteners is also an important factor affecting the connection. The installation process is controlled in important connections. The common control methods are fixed torque method, angle method, yield point tightening method, etc. All of these methods require fastener quality. It's better, and the consistency is better, which puts higher demands on fastener production. In the automotive industry, some companies have proposed zero defects and zero inventory requirements, which is a requirement for high-volume automated production. If parts failure occurs during such installation, it will affect the entire assembly rhythm and cause economic losses. Therefore, the quality of fasteners produced for automobile factories in China is generally higher than other fasteners, and the quality of products in the accessory market is worse than that of complementary products.
However, due to the limitations of the industry's own characteristics, the proportion of technicians is low, and the technical strength is weak. Especially in the past decade, the enterprises have developed rapidly, and the existing technical strength is obviously insufficient. Some enterprises rely on external technicians to help establish enterprises and enterprises. Relying on other companies to learn or explore for themselves, the gap between enterprises is large, and the overall situation is still not optimistic.
Fasteners are mass-produced products with high degree of automation. The production process is mainly guaranteed by the technical level of equipment, molds and operators. The domestic fastener special equipment has a certain gap compared with similar foreign equipment. Imported in recent years. The quantity has been improved. The prices of these equipments are very high. The general enterprises are used to produce products with higher added value. The production level of domestic fastener professional equipment has also been greatly improved, and the price is moderate. It is the first choice for domestic fastener enterprises. Low-cost, low-grade, low-quality, and disproportionate processing equipment for many years still have a certain proportion. It is difficult to completely change this situation in a short period of time. Fortunately, we have seen a significant improvement.
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