What are the special fasteners for electric vehicles?

What are the special fasteners for electric vehicles?

Fasteners are used for fastening connections and an extensive range of applications of a class of mechanical parts, which is characterized by a wide variety of specifications, performance, and use of different, but also standardization, serialization, and generalization of the degree of extremely high. Therefore, some people have national standards for a class of fasteners called standard fasteners or simply common parts—automotive fasteners are related to vehicle safety and vehicle manufacturers on their quality, stability, and other stringent requirements. Industry insiders know that many automotive parts products, such as interior and exterior, electronic and electrical, chassis, powertrain and body-in-white, etc., and fasteners only account for a tiny part. Generally speaking, automotive fasteners contain a variety of loose parts, fastening linkage into the vehicle's various standard and non-standard fastening elements, bolts, screws, etc., with the help of threaded fastening linkage is the main body. Calculated by the number of parts, the number of fasteners accounted for the proportion of the total number of parts of the vehicle far exceeds that of any other kind of parts, amounting to 40% to 55%; the assembly process of the whole vehicle, as well as the assembly, is mainly the process of applying the fasteners to connect the various parts and components. New energy vehicles specifically refer to hybrid electric vehicles (HEV), pure electric vehicles (BEV), and fuel cell electric vehicles (FCEV); batteries have become an important energy carrier for new energy vehicles; therefore, for the battery pack fastening system is a new field, we are optimistic about the future of new energy vehicles. Battery fasteners must have the following characteristics: high durability, vibration resistance, resistance to extreme temperatures, and so on. With the gradual shift from traditional oil vehicles to new energy vehicles, several special fasteners have been added to the automotive fasteners. Let's start with why we need to use new special fasteners.

The battery pack is inevitable for electric cars, and its shell is a big aluminum box with a lid. Threads connect the aluminum box and the lid. Aluminum threads are not strong enough, so each aluminum threaded hole should be inlaid with a steel or stainless steel threaded sheath to strengthen the connection strength of the internal threads.

According to different battery pack design drawings, two types of threaded bushings are installed for reinforcement.

Both types of threaded bushings require specialized tools for installation.

For example, installing a wire-threaded bushing requires a tap, a wire-threading tool, and a tail removal tool.

The installation of self-tapping screw jackets requires a self-tapping screw-in tool.

Automotive fastener technology innovation industry solutions:

Lightweight "is the breakthrough of automotive fasteners

Material lightweight

Aluminum alloy body fasteners can be divided into steel and aluminum standard parts according to the type of material. The form of connection with the body can be divided into mechanical connection class and welding class two. A class of high-strength materials mainly refers to high-strength steel, fasteners in terms of materials abroad, more than the choice of Mn-B series of steel, high-strength bolts surface treatment of zinc-aluminum coating, zinc-nickel alloys, etc., to improve the ability to improve the corrosion resistance of the fasteners at the same time to enhance the stability of the coefficient of friction; the other is a class of lightweight materials, including aluminum alloys, magnesium alloys, titanium alloys, plastics, carbon fiber composites, and other applications.

Lightweight manufacturing process

The automotive fastener manufacturing process focuses on the forming and connection, mastering the aluminum alloy forging temperature, riveting, bonding, and other critical technical parameters to solve the connection problem between different materials to avoid stress concentration. Part of the metal bracket using core-pulling rivets will be the original welded nuts and the original welding bolts to riveting bolts. Due to the high production efficiency and low cost of pull riveting, it is worth promoting.

Lightweight test construction

Relying on the lightweight laboratory, we focus on the construction of laboratories in the fields of metal, composite materials, and connection, of which the metal field focuses on the construction of elemental analysis, metallurgical inspection, hardness mechanics, non-destructive testing, material fatigue, metal material process verification, and other laboratories, to improve the accuracy of the process failure determination and the size of the professional quality standard rate, etc., and to realize the planning, design, and production of automotive fasteners: interconnection and intercommunication.

High-strength bolts and heat-resistant bolts are "life:

High-strength fasteners can provide higher clamping force, reduce the size of fasteners, and reduce their weight to meet the demand for lightweight; at the same time, high-strength fasteners are also conducive to the compactness of other structures of new energy vehicles, thereby improving heat dissipation and internal friction.

At present, domestic new energy vehicles usually use 10B33, SCr440 (40Cr), SCM435 (35CrMo), and SCM440 (42CrMo) steel to produce 8.8, 9.8, 10.9 high-strength bolts, ultra-high-strength bolts and its highest strength level of 1400Mpa grade (14.9 grade).

Heat-resistant fasteners are used to solve the problem of connection failure in high-temperature environments; engine exhaust environment temperature rise will lead to changes in the mechanical properties of the product, such as tensile strength, hardness of the reduction in the generation of creep, or metallurgical organization to produce changes leading to connection failure.

Heat-resistant steel or nickel alloy fasteners, commonly used material grades are: ML06Cr15Ni25Ti2MoAlVB (GH2132), ML04Cr11Nb, ML41CrMoV, ML21CrMoV, 14Cr17Ni2 (1Cr17Ni2), NiCr20TiAl (GH4080A), Inconel718 (GH4169) and so on.

The global "lightweight" mainstream trend has been formed, and the current stage of new energy vehicles is flourishing; derived from the automotive fastener industry, technology update iteration is inevitable. It is not difficult to predict that in the future, the development of new energy vehicle fasteners will involve more industry sectors, such as artificial intelligence, machine learning, big data, and the Internet of Things.

Fasteners face not only the material, manufacturing process innovation, fastener design, molding, heat treatment, surface treatment, assembly, installation, and other aspects of the industry, which will continue to change with the demand for integration.

Please get in touch with us if you want high-quality strength 8.8-grade carbon steel hexagon flange bolts or technical support for structural design. Thanks.Email:adelajonly@gmail.com

Website: https://www.juxinfasteners.com