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Dongguan Yu Chang Electronic Science and Technology Co., Ltd.
Telephone: 0769-86328659
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Mr. Lin
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Address: Shijie Town, Dongguan City, Guangdong Province town management area
Teach you to pick the touch switch?
Time: 2016-08-05 10:30:58 Copyfrom: Dongguan Yu Chang Electronic Science and Technology Co., Ltd.
Tact switch is good or bad influence factors, the key lies in the door touch switch, welding, conduction reliability, life, feel, production process and installation dimensions and determinants of first pin substrate, substrate touch switch pin made of brass or copper (low grade iron), in order to reduce the contact resistance, pin basically silver, for silver case of SO2 gas in the air will oxidize, directly affects the solderability and contact resistance of the switch, so high-quality touch switch first to in the pins of the substrate plating thickness and silver plating process control in place, the market silver quality sequence is as follows:
Silver plated thickness: 0.3um above (silver), 0.2um (Bo Yin), 0.1um (white)
Silver plating process: substrate pre - plating nickel - plating, substrate pre - Copper - plated re - plating, substrate direct plating
After the substrate is coated with a protective agent to deal with or switch is equipped with a waterproof and waterproof function is very critical, or even the best silver plating treatment, the switch will be oxidized.
Secondly guide through the key factors affecting the reliability is the contact point of the structure, because the function of the touch switch contact conducting contact points and shrapnel, then the contact point of the contact surface is better, contact surface determined by the structure and the market about three kinds of structure and order of quality are as follows:
Bulla (volcano type) "O type contact", slotted type "2 point contact", "1 point contact type bubble"
Third, life and feel is with the touch switch trip and shrapnel, stroke is short sound lighter, longer life, stroke is long and vice versa, under the fixed shrapnel process, mainly to see the stroke or sound decisions touch switch of life;
In addition, decide on the life of shrapnel is a key element of the stamping technology, Japan and Taiwan stamping technology in China has been very popular, so in technology promotion, requirements of material whether the imported materials to reduce, such as shrapnel 160gf life in the market is that there are four main
About 50 thousand times (domestic copper or backward stamping technology), about 100 thousand times, 200 thousand times (stainless steel)
The fourth is production process, parts ultimately affect the quality of is the assembly process, assembly process depends on the production of the company's management ability and employee quality awareness and quality assurance ability etc. factors, different ability to guarantee the quality of the final product is certainly different, the market assembly methods are manual and machine, machine assembly and low cost but low quality products, manual assembly cost is high but the quality is high.
The fifth is the factory inspection, factory test method and the project but also affect the quality of final touch switch, such as appearance, handle, a guide, resistance and other project is sampling or testing, such as some giant scrap rate is ppm to measure or zero defects, to in ex factory test set full inspection also set the sampling inspection and quality inspection process.