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一、产品特点及市场情况慨述自攻螺钉具有一定的表面硬度(HRC50左右)和机械强度,并且有攻丝和紧固机能,只须在被联接件上打一预孔,即可容易地旋进去,能紧固薄钢板联接件、薄钢板与木质件联接;铜、铅板与工程塑料件联接、以及胶木件联接等。联接方法如示图。采用自攻螺钉可省去攻螺纹工序,省去螺帽,紧固可靠、耐震度高、减少装配施工劳动工时,且价格低廉。自攻螺丝被广泛使用在汽车、火车、船舶、宾馆、电器、仪表、电视机、洗衣机以及玩具等方面。自攻螺钉是美国于第二次世界大战期间发展起来的一种新型紧固件、现已普及国际化、在我国也已有廿多年的生产历史。据报导,美、日、西欧等发达国家自攻螺钉应用数量已占整个紧固件的50～60％,且有取代机螺钉的趋势,规格及专利极多。但在我国只
First, product characteristics and market conditions Self-tapping screws with a certain surface hardness (HRC50 or so) and mechanical strength, and tapping and fastening function, only need to make a pre-hole in the connected parts, you can easily Precession, can be fastened thin steel plate connector, thin steel plate and wood pieces connected; copper, lead plate and engineering plastic parts connection, and bakelite pieces and other connections. Join methods are illustrated. The use of tapping screws can eliminate the tapping process, eliminating the need for nuts, reliable fastening, high shock resistance, reduced labor hours for assembly and construction, and low prices. Self-tapping screws are widely used in automobiles, trains, ships, hotels, electrical appliances, meters, televisions, washing machines and toys. Self-tapping screws are a kind of new type of fasteners developed by the United States during the Second World War. They are now universalized and have been produced in China for many years. According to reports, the number of self-tapping screws used in developed countries such as the US, Japan, and Western Europe accounts for 50 to 60% of the total fasteners, and there is a tendency to replace the machine screws. There are many specifications and patents. But in our country only