Products Description

This Self-Drilling Self-Forming Screw is primarily designed for the assembly and fastening of aluminum alloy housings in new energy lithium-ion battery power/energy storage systems. During battery module assembly, precise connections between the aluminum alloy housing and the internal structure, as well as between the module and the enclosure, are required. This necessitates fasteners with excellent vibration resistance, electrochemical corrosion resistance, and high installation adaptability. Through targeted material selection and structural design, this product perfectly matches the characteristics of aluminum alloy substrates, solving the pain points of traditional fasteners in aluminum alloy connections, such as easy stripping, weak connections, and low installation efficiency. It provides stable and long-lasting fastening support for new energy lithium-ion battery systems.

Material properties

Excellent Corrosion Resistance

Addressing the corrosion risks inherent in lithium battery systems, such as electrolyte evaporation and humidity fluctuations, the material for Self-Threading Screw undergoes passivation treatment to form a dense oxide protective film. This effectively resists electrochemical and environmental corrosion, preventing fastener failure due to rust and ensuring long-term stable operation of the battery module.

Balance of High Strength and Toughness

Through precise material composition control, the Self-Cutting Screw combines high tensile strength with good toughness. It can withstand high-frequency vibrations and impact loads during transportation and use of the battery system, preventing fastener breakage or deformation and ensuring the integrity of the connection structure.

Excellent Thermal Conductivity

The material possesses moderate thermal conductivity, which helps dissipate localized heat generated during battery module operation, preventing material performance degradation due to localized overheating. Simultaneously, Self-Forming Screw maintains good compatibility with the thermal expansion coefficient of the aluminum alloy substrate, reducing connection stress caused by temperature changes.

Self-Forming Screw

Manufacturing Process

Precision Cold Forging

Utilizing imported high-precision cold forging equipment, the screw head and shank are formed in one step, avoiding dimensional errors and performance damage caused by secondary processing. This ensures coaxiality and structural stability for Self-Tapping Nail
, resulting in a smooth and even bearing surface for improved stress uniformity.

Precision Machining of Helical Grooves

The helical grooves are machined using five-axis simultaneous milling technology. The groove angle and helix angle are optimized to ensure smooth chip removal during drilling, reduce drilling resistance, improve self-drilling efficiency for Self-Forming Screw, and prevent gaps caused by residual aluminum chips.

Cold Rolling Forming of Threads

The threads are processed using a non-cutting cold rolling process. Compared to traditional cutting processes, this better preserves the continuity of the material's metal fibers, improving the strength and wear resistance of the threads. The thread precision reaches 6H grade, ensuring a tight meshing with the aluminum alloy substrate and avoiding the risk of stripping.

Surface Strengthening Treatment

Vacuum ion plating technology is used for surface treatment, forming a uniform wear-resistant protective layer. This further enhances the Self-Cutting Screw's wear resistance and corrosion resistance, while reducing the coefficient of friction between the threads and the substrate, facilitating self-tapping during installation.

Production Process of Self-Drilling Self-Forming Screw

Application Scenarios

Precision Manufacturing

In the manufacturing of precision instruments and high-end equipment, Self-Threading Screw provide a clean and efficient connection solution. Their chip-free characteristics make them particularly suitable for environments with high cleanliness requirements.

New Energy and Electronics Industry

The assembly of battery modules and power electronic devices requires highly reliable connections. Our Self-Cutting Screw can form strong connections on various metal casings without generating conductive debris.

High-End Structural Assembly

In demanding fields such as aerospace and rail transportation, the reliability of screw connections directly affects the overall structural safety. Our Self-Forming Screw has passed rigorous vibration and fatigue tests.

Application of Self-Drilling Self-Forming Screw