Discussion on Fasteners for Household Appliances and Office Equipment

Discussion on Fasteners for Household Appliances and Office Equipment

At present, the use of ordinary household appliances and office equipment is huge. In high-performance, high-quality household appliances and office equipment, there are many places that need high-function, high-value-added fasteners, and now have a broad market. The following is a brief introduction to the demand and development trend of these fasteners and their materials.

1, television

Among the fasteners for home appliances, the one that has changed the most in recent years is the fastener for TV. Television has changed from analog to digital television, and due to the progress of liquid crystal and plasma technology, the thinning of television has been accelerated. As a result, there have been many requirements not found in the era of cathode ray tube television.

The internal components of a thin TV can be divided into three parts: display screen, motherboard and chassis. Initially, thin TV cabinets were mostly made of aluminum alloy. This is because the advantage of the thin TV is that the display screen is large, and the weight of the display screen is the largest in the thin TV, so the cabinet is required to be light and have a certain strength. The motherboard is installed on the aluminum alloy chassis. Due to the large heat release of the motherboard, there are aluminum bumps between the motherboard and the chassis to keep a certain distance between the two. Initially, aluminum bumps made by turning were used, and with the increase in production of thin TVs, forging of bump manufacturing was required. The aluminium lugs shall be able to press into the aluminium alloy casing and shall not be loosened when fastened with screws. Forging and rolling manufacturing of aluminum bumps were tested, and the shape of the bumps combined with heat treatment can not meet the requirements of use, and finally developed an "internal assembly" aluminum bumps.

In order to reduce the fastening cost, self-tapping screws are used. When the screws are fastened, internal threads are formed in the aluminum bumps. A drawback of this type of self-tapping screw fastening is the powder generated when the internal thread is formed. If this powder is scattered on the display screen or motherboard, it will cause the TV to fail. In addition, the aluminum alloy tapping screw generates frictional heat at the time of forming the internal thread to cause sintering of the tapping screw and the aluminum bump is also a problem. The solution to these problems is to use "aluminum seal" to improve the self-tapping of aluminum alloy and prevent sintering. In addition, the powder adsorbent is started to be applied to the front end of the seal to prevent the powder from scattering when the tapping screw is fastened. The combined use of these measures improves the productivity and quality stability of the thin television.

The biggest feature of thin TV is "thin", because "thin" in other parts also produced no problems in the past. In the past, the screws inside the TV were exposed to the surface, and the thin TV was prone to heat. This heat caused the screws to be in a high temperature state. If the screws were exposed, people exposed to the high temperature of the screw head would cause burns. In order to prevent this from happening, a "heat-proof screw" with resin embedded in the head of the original steel screw was developed ".

2, the mobile phone

The requirement of screws for mobile phones is to ensure the realization of hardware requirements such as waterproof and thin mobile phones. With the development of light and thin mobile phones, thin resin materials are used more and more in mobile phones. The requirement for screws for mobile phones is to firmly fasten this thin resin material. In order to meet this requirement, the PS-Ⅱ type screw was developed. This is a thin resin special shallow embedded screw, can ensure that the thin resin after fastening has sufficient strength. The waterproof of the screw fastening part of the waterproof mobile phone is very important, but it is difficult to ensure the waterproof by the screw alone. At present, the fastening screw with the O-shaped washer is mainly used.

3 The Digital Camera

Digital cameras have now become the mainstream products of cameras, and the requirements for digital cameras are high functionality and miniaturization. In order to maintain the unique black appearance of the single lens reflex camera, the head of the screw exposed on the camera surface should be coated, but when the coated screw is tightened, the coating near the cross recessed head of the screw will peel off. In order to solve this problem, anti-paint peeling screws have been developed, and have been widely used in single-lens reflex cameras.

The miniaturization of the digital camera requires a compact structure. PS-Ⅱ screws with a head height of 0.2mm can meet the requirements of fastening thin parts and save space. Reduce the height of the screw head, the cross groove head becomes shallow accordingly, and the screw fastening operation rate decreases. For this reason, a strong drive cross wrench needs to be developed.

In order to realize miniaturization, the casing material has a tendency of thin plate. In order to compensate for the decrease in strength caused by thin plate, stainless steel is selected as the casing material. Stainless steel is a difficult material to tap, and tapping before screw fastening is a cause of increased manufacturing cost. Through the research of the screw material and the improvement of the heat treatment process, the developed high-strength screw ensures the self-tapping of the stainless steel material and can promote the realization of the miniaturization of the camera.

Source: Golden Spider Fastener Web