How to choose the appropriate type of self-locking tuning screw in the field of communication mobile phones?

In the field of communication mobile phones, the following aspects need to be considered when selecting the appropriate type of self-locking tuning screw:

dimensions

Diameter: it should be selected according to the structure of the internal space and tuning position of the mobile phone. Common ones are M2, M2.5 and other smaller diameters to adapt to the miniaturization design of mobile phones. For example, in some thin and light mobile phones, screws with smaller diameters can realize the tuning function in a limited space, and at the same time avoid squeezing other components.

Length: It needs to be determined according to the thickness of the tuning part and the installation requirements. Generally speaking, the length should ensure that the screw can be screwed in and fixed effectively, and at the same time, it will not be too long to penetrate or affect other parts. For example, in the mobile phone filter module, the length of the screw should match the total thickness of the filter cavity and the cover plate to achieve stable connection and precise tuning.

Material characteristics

Conductivity: Signal transmission in communication mobile phones is highly required, so the screw material should have good conductivity to avoid interference or attenuation of signals. Copper alloys, such as brass, beryllium bronze or phosphor bronze, are usually selected. These materials not only have good electrical conductivity, but also have certain elasticity and strength.

Corrosion resistance: Mobile phones are used in various environments, and screws should have certain corrosion resistance to prevent rust and oxidation and ensure long-term stable performance. Stainless steel materials, such as 304 stainless steel, have good corrosion resistance and are suitable for some mobile phone models with high environmental adaptability.

Self-locking performance

Torque requirements: according to the fixed requirements and tuning accuracy requirements of the internal components of the mobile phone, select the self-locking tuning screw with appropriate torque. The torque is too small, and the screw is easy to loosen, resulting in tuning failure; Too much torque may break the thread and damage the components during assembly. Generally, through testing and calculation, the torsion range that can meet the internal structure fastening and tuning stability of mobile phones is determined.

Self-locking mechanism: Common self-locking mechanisms include staggered threads, elastic elements or special structural design. For example, the self-locking tuning screw with staggered threads can achieve self-locking through friction between two sets of staggered threads and nuts, but attention should be paid to its torsional stability after being screwed in and out for many times; Screws with elastic elements rely on elastic force to realize self-locking, so it is necessary to pay attention to the influence of the material and performance of elastic elements on self-locking effect.

required precision

Thread accuracy: The field of communication mobile phones requires high tuning accuracy, and the thread accuracy of screws should not be lower than the level specified in relevant standards, such as level 6 specified in GB/T197, to ensure the accuracy and repeatability of tuning.

Machining accuracy: including the machining accuracy of screw diameter, length, head shape and other dimensions, as well as surface roughness. High-precision machining can ensure that the screw is closely matched with the tuning structure inside the mobile phone, reduce errors and improve tuning performance. For example, in the RF module of some high-end mobile phones, the machining accuracy of screws is required to reach ±0.05mm or even higher.

Head type

Inner plum blossom head: This type of head is more common, and its advantages are close cooperation with screwdriver, uniform force, and difficulty in slipping teeth. It is suitable for operation in a small mobile phone and convenient for accurate tuning.

Other types: such as hexagon head, cross head, etc., can also be selected according to the production technology of mobile phones and the convenience of assembly tools. However, it should be noted that the design of the head should be convenient for tightening and tuning during the assembly of the mobile phone, and at the same time, it will not cause damage to the surrounding components.

Product quality and certification

Brands and suppliers: Choose well-known brands and suppliers with good reputation, and the quality and performance of the self-locking tuning screws produced by them are more guaranteed. For example, some manufacturers who have been focusing on screw production in the communication field for a long time have rich experience and advanced production technology and can provide high-quality products.

Certification standard: the product should meet the relevant industry standards and certification requirements, such as RoHS certification (restricting the use of harmful substances), so as to ensure that the screws meet the requirements in terms of environmental protection and safety, and will not cause harm to human body and environment, and at the same time ensure compatibility with other components of the mobile phone.