14th FASTENER EXPO SHANGHAI From March 20, 2024 to March 22, 2024, the 14th FASTENER EXPO SHANGHAI was held at the Shanghai National Expo Center. Chuangtuo Jinggong (Jiangsu) Co.,Ltd attend the exhibition.
Review of relevant knowledge points about fastener assemblies
In order to solve the problem of anti-loosening of fasteners, bolts and nuts are used in combination with washers. At the same time, there are many types of variant products of nuts to solve the problems of assembly, anti-loosening and appearance. Combination bolts or combination nuts are also a type of bolts and nuts, but they are generally three-assembly components or combination components. Because the flat washers and spring washer
Process specifications for torque angle tightening
The thread torque angle method is to tighten the bolt or nut to the initial torque and then rotate it to a specific angle. Depending on the target axial force, the bolt can be tightened into the elastic region or overyield. The advantage is that the initial torque tightening stage is affected by the friction coefficient, but the axial force generated in this stage is small and can be ignored. In the elastic region, the axial force is p
Fastener corrosion cases and solutions
Various types of fasteners are widely used in automobiles. Almost all fasteners require surface treatment before they can be used. Good corrosion resistance is the most basic requirement for surface treatment of fasteners. In the daily work of fastener engineers, a large part of their work is to deal with the corrosion problem of fasteners. We list some cases of fastener corrosion problems that occurred in actual work, analyze the root causes of the problems, and explain the so
Common quenching defects in fastener heat treatment
Quenching defects are the most common in the quenching and tempering heat treatment process of fasteners, such as insufficient hardness, deformation, cracking, etc. There are many reasons for defects, which need to be inspected and analyzed from all aspects. Metallographic inspection is a commonly used method and plays an important role. 1. Quenching cracks The internal stress
The depth of the hexagon nuts` threaded hole is not enough after processing, how to repair it?
In the process of tapping workpieces in the machining industry, sometimes due to unreasonable technology (the end face of the threaded hole is processed after welding the workpiece with processed threaded holes), the processing personnel make mistakes in reading the drawings (wrong size) or operating errors (Calculation errors, drilling shallow bottom holes, programming errors, and drilling and tapping threaded hole depth positioning errors) and many other factors lead to the phenomenon that the threaded holes on some workpieces are not deep enough after processing.
Cause Analysis of Fastener Bolt Breakage
As we all know, bolts are used to connect mechanical parts, and they are also very important to the function of machinery. If the bolt connection is not good, it will directly affect the normal operation of the machine. However, what is distressing is that bolts often break in mass production, and many users do not know what factors cause bolts to break. What are the factors that cause bolts to break? How did the bolt break? How many types of factors are there for bolt breakage? Today we will analyze the reasons.
Choice of fastener surface treatment for Hexagon Nuts
For a specific design, which surface treatment to choose is a problem faced by every designer. There are many types of surface treatments to choose from, ranging from plain oil to gold. But the designer should choose the surface treatment that can achieve the purpose economically. Since almost all commercial fasteners are made of carbon steel, alloy steel, some types of fasteners are expected to be protected from corrosion, and even fasteners using corrosion-resistant mat
Analysis and application of commonly used materials for fasteners
Fasteners are mechanical basic parts and are in great demand. Usually, bolts, screws, rivets, etc. are used to ensure safety or generally do not need to consider the influence of temperature in harsh environments or other dangerous working conditions. Commonly used materials are carbon steel, low alloy steel and non-ferrous metals. However, in certain occasions, fastener materials need to meet severe corrosion or high-strength conditions, and many stainless steels and ultra-high-strength stainless steels have emerged as the times require. This article pro
Zinc-Nickel Alloy Plating Technology
The standard electrode potential of zinc is -0.76V, which is a typical sacrificial anode protective coating for steel substrates. Zinc alloy coating is a further development of electro-galvanized coating. By adding nickel, tin, cobalt, chromium and other alloying elements, it not only maintains the sacrificial anode protection characteristics of zinc coating, but also makes the coating The performance, especially the corrosion resistance, can be greatly improved.
The origin of the fake 8-level nut
The DIN 934 nut standard has been eliminated in 2002, and it has been upgraded to the ISO 4032 "Hexagon Nut Type 1" and ISO 8673 "Type 1 Hexagon Nut-Fine Thread" standards. The nut thickness of this standard has increased, so the mechanical performance standard is adopted. According to ISO 898-2, it is stipulated that the load capacity of nuts increases with the increase of specifications, such as the grade 8 nuts gradually increase from 855MPa of M5 to 920MPa of M39. Because the size of the proof load of
2023 Fastener Fair USA ended perfectly
From May 16th to 17th local time, the 2023 Fastener Fair USA was held at the Music City Center in Nashville, Tennessee. According to reports, the exhibition area of this exhibition exceeds 20,000 square meters, attracting more than 18,000 exhibitors, and the number of exhibitors and participating brands reached 300. Among them are many companies from
Analysis of six major surface treatments
Surface heat treatment refers to a metal thermal processing process in which the chemical composition and structure of the material surface are changed by means of heating, heat preservation and cooling in a solid state to obtain the required properties. The following are six surface heat treatment methods.
Main Factors Affecting the Results of Salt Spray Test
The main factors affecting the results of the salt spray test include: test temperature and humidity, the concentration of the salt solution, the angle of sample placement, the pH value of the salt solution, the amount of salt spray settlement and the spraying method, etc. 1. Test temperature and humidity Temperature and relative humidity affect the corrosive action of salt spray. The critical relative humidity for metal corrosion is about 70%. When the relative humidity
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