How to analyze the good and bad factors of tap switch
Release time：2019-12-13 Clicks： Click
How to analyze the good and bad factors of tap switch and the specific situation? Let's give you a detailed introduction in this respect.
The most important factors affecting the quality of light touch switch are its protection, weldability, conduction reliability, life span, hand feeling, production process and device scale.
It is mainly pin base material. The pin base material of the tap switch is brass or phosphor copper (low-level is iron). In order to reduce the contact resistance, the pin is basically silver plated. The SO2 gas in the air will oxidize when silver meets, which directly affects the solderability and contact resistance of the switch. Therefore, the high-quality tap switch should be controlled in the aspects of the silver plating thickness and silver plating process of the pin base material. The market The quality of silver plating is as follows:
Thickness of silver plating: above 0.3um (Post Silver), 0.2um (thin silver), 0.1um (white) silver plating process: pre nickel and re silver plating on base material, pre copper and re silver plating on base material, direct silver plating on base material
It is very important whether the base material is treated with protective agent or whether the switch has the function of dust-proof and water-proof after silver plating. Otherwise, even the best silver plating treatment, the switch will be oxidized.
Secondly, the key influencing factor of the conduction reliability is the structure of the contact point. Because the function of the light touch switch is to conduct the contact conduction between the contact point and the shrapnel, the larger the contact surface is, the better. The contact surface is selected by the structure. There are about three types of structures in the market,
The next best is as follows:
Big bubble (crater type) "O-type contact", slotted type "2-point contact", flat bubble type "1-point contact"
First, the lifespan and hand feeling are the cooperative selection of stroke and shrapnel. The shorter the stroke, the lighter the dynamic life, and the longer the stroke. On the contrary, under the fixed shrapnel process, the life of stroke or dynamic selection is the first choice. In addition, the key factor of choosing the lifespan of shrapnel is stamping skills. The stamping skills of Japan and Taiwan are very good now in China It's quite extensive, so if the skill is improved, whether the requirement of imported materials is reduced again. For example, the life of 160gf shrapnel in the shopping mall is mainly four kinds of 50000 times (domestic phosphor copper or relatively backward stamping skill), 100000 times or more, 200000 times (stainless steel)
The second is the production process. The assembly process is the one that affects the quality after having the parts. The assembly process depends on the selection of the production company's management talents, the quality meaning of the employees and the quality assurance talents. The product quality that comes out of different assurance talents must be different. Now the assembly methods of the shopping malls have manpower and machines. Because the automation talents are improving again, so each of them Good or bad: low cost of machine assembly but low quality of products, high cost of manual assembly but high quality.
The third is the factory inspection. The methods and items of factory inspection also affect the quality of touch switch. For example, the appearance, hand feeling, conduction, resistance and other items are spot check or full check. For example, the scrap rate required by some large factories is measured by ppm or zero defect, so the process of spot check or quality check should be set after the factory inspection.
The above is about the analysis details of the factors that touch the switch.
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