screw selection in product assembly design, a more important link is the connection between the components and components. There are pin connection, interference connection, thread connection and so on. The most common way that is commonly used is thread connection. Because most of the company's parts for plastic parts and hardware. How to choose screws correctly has become the key to design thread connection, the following three aspects to explain how to choose and use screws:
Type and application of screws 2. Comparison table between screws and materials of plastic components 3. Description of screws 1. 1) Material according to the material of the Screw can be divided into: a) carbon steel screw B) stainless steel screw C) copper screw a) carbon steel screw carbon steel screw Silk is a common type of screw, its low price, widely used in the requirements of low and bear torque general alignment, such as the internal structure of the body and Other places. Carbon steel screws can also add hard to bear for torque big occasions, such as cooperate with metal (aluminum or iron). Carbon steel screws to improve its performance and enhance its characteristics, prevent rust and meet other special requirements, all can take surface treatment methods such as black, nickel plating, chrome plating, zinc plating, copper plating, etc.
Black screw (scientific name hair blue) appearance is black, generally using chemical or electrochemical methods. At present, alkaline chemical oxidation method is used in production to improve its corrosion resistance, because the main component of the outer oxide film is Fe3O4. Therefore, it can only be used in general conditions or oily media. Blackened screws are rarely used in our company's products, mainly considering the impact of appearance, we will use blackened screws.
Nickel plated screw appearance is white, magnetic, stable to water and air at room temperature; Soluble in dilute acid; Nickel plated screws are widely used in our products for their appearance, corrosion resistance and production cost, such as common connecting screws including box body.
Chrome-plated screws are silvery white in appearance and have strong passivation ability in air to maintain gloss for a long time. Chrome plating has high hardness and excellent wear resistance, but the cost is higher than nickel plating screws. It is used for some appearance requirements or screw hardness requirements
