The "Rice of Industry" helps the development of new energy vehicles! Solutions for fasteners commonly used in aluminum car bodies

The "Rice of Industry" helps develop new energy vehicles! Solutions for fasteners commonly used in aluminum car bodies

Under the development trend of automobile lightweight, aluminum alloy has become the second largest body material after steel. For example, to improve range, the application of an all-aluminum body can reduce the weight of the body; three electric shell parts and aluminum substrate heat dissipation are also a large number of applications of aluminum alloy materials, and even small fasteners can not be separated from the aluminum material.

Fasteners are used for fastening connections and applying an extensive range of mechanical parts, characterized by various specifications, performance, and use of different. However, standardization, serialization, and degree generalization are also very high. Therefore, some people have national standards for a class of fasteners called standard fasteners or simply standard parts. Automotive fasteners are related to vehicle safety; vehicle manufacturers have stringent requirements for their quality and stability. Generally speaking, automotive fasteners contain a variety of loose parts fastening connections into the vehicle's standard and non-standard fastening elements, bolts, screws, and other fastening connections with the help of threads in the main body. Calculated by the number of parts, the number of fasteners accounted for the total number of parts of the vehicle far exceeds the proportion of any other kind of parts, amounting to 40% to 55%; vehicle and assembly process, mainly the application of fasteners to connect the various parts of the process. From the industry point of view, the demand for automotive fasteners accounted for about 23% of the total sales of the entire fastener industry; the industry accounted for the highest. With the popularization of new energy vehicles, the amount of fasteners is also increasing, especially in the process of power battery energy density, and performance continues to improve; the safety of fastener threaded connections is more important. Aluminum alloy body fasteners can be divided into steel and aluminum standard parts according to the type of material. The connection with the body can be divided into mechanical connection and welding.

Mechanical connection automotive fastener solutions

1. Self-piercing fasteners: Self-piercing bolts or nuts are also known as self-pierce riveting bolts or nuts, in which the self-piercing standard parts are cold molding processes that penetrate the plate through the end flap structure and form a reliable interlocking structure with it. The method of self-piercing standard parts includes four stages: clamping, piercing, molding, and releasing. Self-piercing standard parts can withstand standard moments; plates do not need to be opened, in which the bolt is well sealed, etc. However, the cost of the standard parts is higher, and they are only suitable for thin-walled aluminum plate parts with a thickness of less than 2.0. Self-piercing bolts are used in the EA LX body's front siding and floor area. Self-piercing standard parts can be widely used in aluminum body aluminum stamping parts.

2. Riveting fasteners: riveting, also known as pressure riveting, also known as self-buckling, is a kind of standard parts and plate through the typical structure or radial structure of the interlocking connection form. Two main types of teeth are interlocking riveting and folding interlocking riveting. It can be widely used in aluminum alloy body stamping parts, extrusion parts, and casting parts on all kinds of parts. The following contents introduce the two common types of riveting standard parts. Toothed interlocking riveting standard parts are mainly through the root of the standard part of the tooth-like structure and the cylindrical surface of the open plate extrusion interference fit, and the formation of the interlocking structure completes the standard parts and plate connection. Its structural form is as follows: the upper part, with applying force and mold molding. This type of riveting standard parts, a simple structure, low cost, and the lower mold only needs a plane. However, the launch force is small, so caution is recommended for open cross-section, precision requirements of the lower mounting points, and critical hard points.

3. Folding class interlocking riveting standard parts: mainly through the bottom of the standard parts of the flange structure and open plate surface under the action of the pressure head, the inherent mold extrusion under the flap bending molding nested each other to form an interlocking structure, to complete the standard parts and the connection of the plate. The structure of the process package consists of three stages: on the piece with Shi force and molding. In this kind of pressure riveting standard parts, the launch force is a solid and reliable connection; the structure is complex, has a high cost, and needs a specific lower mold with molding. They are generally used for critical hard points or important installation points.

Pressure riveted nuts and bolts are used on the EAN V model's door sill and front bumper beam connecting plate. Pressure riveting standard parts can be widely used in all aluminum alloy body parts.

4. Pull riveting fasteners: The blind pull riveting nut is through the standard head pull pressure deformation expansion and the end of the flange surface up and down the clip plate openings, forming a stable and reliable form of connection of standard parts. It is used for all kinds of metal plates, tubes, and other manufacturing industries in fastening; it is widely used in aluminum car bodies.

The pull riveting standard parts process includes four stages: automatic loading, insertion of mounting holes, pull riveting, and reverse spin out. As shown in Figure 11 below. Pull riveting has the advantages of simple structure, reliable connection, easy assembly and disassembly, one-way operation, etc. The disadvantage is that most of the flange surface of the end of the riveted standard parts will protrude from the plate, which is not conducive to the installation of the parts and the direct fit of the body plate. Riveting bolts and nuts are mainly used in aluminum alloy body profiles, castings, thin-walled parts, pipelines, wiring harnesses, trim accessories, and other critical mounting points to provide a mounting structure. Riveting standard parts are widely used in aluminum profiles with closed cross-sections and cast aluminum parts with open cross-sections.

Welding technology solutions in the automotive industry

1. Aluminum welding stud: aluminum stud welding is the end of the aluminum alloy stud and aluminum plate parts surface contact, energized arc, to be melted on the contact surface to give the stud a certain pressure to complete the welding method.

The aluminum stud welding process mainly includes the upper part, pre-tensioning, fusion, and exit four stages. Aluminum stud welding has the advantages of being low-cost, fast, and flexible. The disadvantage is the weak connection strength. The same type of the same specification aluminum stud welding connection strength steel stud welding weak, generally used for stamping aluminum plate fixed wire harnesses, piping, and other card structures.

2. Steel wire threaded bushings: threaded bushings engage with aluminum alloy castings through the external threads and through their internal threads to provide external connectors that can be engaged threads of a standard form. The threaded bushing realizes the goal of a high-strength connection with low-strength metal materials and has proven its feasibility over 40 years of use. Manufactured from high-quality stainless steel, the threaded bushing is fitted into a cast aluminum body part to form a reliable internal thread that can be disconnected at the notch (pre-set breakpoint) to mount the tailstock.

Threaded bushings are available in plain and self-locking versions. Regular-type threaded bushings are made from wire coils with a precisely molded diamond cross-section, resulting in a standard female thread that is usable on both sides. The self-locking type has the same technical advantages as the plain type; in addition, it is designed with an internal thread locking area, which is realized by holding the threads of the mounting screws by one or more turns of polygonal coils.

Threaded bushings are widely used for cast aluminum parts to mount chassis hard points such as subframes, power cells, body bodies, and other vital parts. They also provide mounting points for connecting reinforcement plates between longitudinal beam joints and door sills.

Aluminum Sleeve Nuts Solutions for the Automotive Industry

Aluminum sleeve nuts are generally made of 7-series aluminum with internal threads for high connection strength and load retention up to PC10 class based on twice the thread length. Sleeves are used to connect the two ends of the profile in a cold connection so that the two ends of the profile share the load.

Aluminum sleeve nuts have the advantages of a reliable connection, high torque requirements, and simple assembly. The disadvantage is the high cost, and the cross-section dimensions of the profile beam need to be matched with the application. Aluminum alloy sleeve nuts are mainly used in aluminum body parts at important installation points, such as subframe, suspension, motor assembly, power battery, and other critical hard points, such as seat belt installation points.

Thanks to the rapid development of the automotive industry, known as the "rice of industry," the fastener industry has also ushered in the rapid growth of Juxin Fasteners set up a special department responsible for the production of automotive fasteners is the automotive non-standard fasteners based on the leading professional automotive fastener enterprises.

If you are looking for high-quality steel blind rivet nut fasteners or technical support for structural design, please get in touch with me. Thanks.Email:adelajonly@gmail.com

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