One sample selection   　　 When preparing samples, care should be taken to eliminate some abnormal factors that affect fatigue strength. There are two types of factors that affect the spring fatigue strength test: one is internal factors, such as chemical composition, metallographic structure, etc.; the other is external factors, such as surface condition, shape and size, temperature, surrounding medium, etc. Generally, it is based on the inherent fatigue strength of the material (internal factors), and the external factors are considered for correction. Therefore, in the test process, the test piece should try to eliminate the influence of external factors. When conducting the first type of test, samples can be prepared according to the conditions of use, or samples can be taken directly from the product. The second and third types of tests should be sampled according to specific requirements.   　　A. Specimen size The spring size is always different, so even under the same amount of deformation, the stress and fatigue strength between them are not exactly the same. In order to accurately reflect the fatigue strength of the sample, the measurement accuracy of the size should be improved on the basis of reducing the size error.   　　 1) The measurement accuracy of the sample size should be greater than 0.5%. When the material size is less than 2 mm, its accuracy should be 0.01 mm. If 0.5% of the sample size is less than 0.01mm, the accuracy is 0.01mm.   　　2) When measuring the size of a circular cross-section (such as outer diameter D2, spring wire diameter d), two diameters perpendicular to each other on the same cross-section should be measured, and the average value should be used as the diameter.   　　3) According to the spring shear stress calculation formula:   　　 It can be seen that in order to reflect the maximum shear stress, the maximum value of spring D/D should be measured.   　　B. Sample shape   　　1) In order to ensure that the spring does not produce eccentric load after being stressed, the parallelism of the two ends of the spring and the perpendicularity of the whole spring should be strictly checked.

Compression springs are coil springs that are subjected to axial pressure. The cross-section of the materials used is mostly circular, and they are also rolled with rectangular and multi-strand steel. The springs are generally of equal pitch. The shapes of the compression springs are: cylindrical, conical There is a certain gap between the rings of the compression spring, and the spring shrinks and deforms when it is subjected to an external load, storing the deformation energy. Compression springs provide resistance to external load pressure. Compression springs are generally wire coiled at equal pitches and have a fixed wire diameter. Compression springs use multiple open coils to provide resistance to external load pressure. That is, they push back against external pressure. Compression springs are generally wire coiled at equal pitches and have a fixed wire diameter. In addition, there are also conical compression springs, or a combination of conical and linear springs. Depending on the field of application, compression springs can be used to resist pressure and store energy. Round wire is the most commonly used compression spring, but there are also compression springs made from square, rectangular, and specially shaped wires.

Compression springs are helical springs that bear axial tension, and extension springs are generally made of circular section materials. When not under load, the coils of the tension spring are generally tight and there is no gap between the coils. A number of different termination devices or "hooks" are used to secure the source of tension for the extension spring. An extension spring works the opposite of a compression spring. Compression springs act in the opposite direction when they are compressed, and tension springs act in the opposite direction when they are extended or pulled apart. When the ends of the extension spring are pulled apart, the spring tries to pull them back together. Like compression springs, extension springs also absorb and store energy. But unlike compression springs, most extension springs are usually under some degree of tension, even without any load. This initial tension determines how tightly the tension spring coils without any load.

触控弹簧是指专门用于电容式和单片机触摸屏电器的专用弹簧按钮。触控弹簧又称触控弹簧、按钮弹簧和触控弹簧。   一个强大的电容传感替代传统的机械开关。具有可伸缩的触摸键，无需更换外壳模具即可通过触摸键控制产品，触摸灵敏度非常好。   金属弹簧电感-可作为固态电导传感器的替代品，使PCB可以远离覆盖层，并在高振动或极端温度变化的工作条件下提供可靠的传感器连接。此外，弹簧可以提供其他功能，如背光，混合机械和电容按钮，以及更多。

电容感应是传统机械开关的有力替代品。然而，在某些应用中，印刷电路板不能直接放置在覆盖层下面，也不能将印刷电路板附着在设备外壳上。   这些应用包括家用电器，如炉灶、洗衣机、冰箱、微波炉，以及各种车辆电子设备，如收音机、电视调谐器、控制面板和座位上的乘员检测系统。   在实际应用中可以使用不同形状的弹簧。每种形状都有其优点和缺点。常见的弹簧包括圆形弹簧、变径圆形弹簧和矩形弹簧。

“小弹簧大世界”，位于容桂华口工业区的广东信兆朗精密科技股份有限公司（以下简称“信兆朗”），前台这六个大字分外醒目。信兆朗成立十年产值增长200倍，从一家小工厂成长为专注弹簧生产的高新技术企业。3月1日，记者采访了公司负责人蔡朗明。   创业十年产值增加200倍 10年前，蔡朗明从云浮来到顺德，成为一个电容器销售。偶然得知一家容桂企业需要触摸弹簧，蔡朗明牵线做成了这笔生意。这次经历也让蔡朗明发现了弹簧生产的商机。2012年，信兆朗的前身诞生在容桂细滘。学计算机出身的蔡朗明对网络天生比较敏感，通过摸索开始大范围在网上做广告。网络推广给公司带来了意想不到的效果，珠三角、长三角地区的订单如雪片般飞来。“第一年就做成了30多万元的生意。”谈起十年前的创业历程，蔡朗明直言自己也是偶然进入弹簧生产领域，企业的发展与经营有关，更离不开这十年来家电、汽配等行业的快速进步。“不到三年产值超过千万元，今年预计超过六千万元。” 同许多初创企业一样，开始的几年蔡朗明既是老板又是销售还兼财务。“到2018年感到这种粗放的管理模式已经不能适应形势了。企业要引进高质量人才，治理结构也要变化。”蔡朗明下决心对企业进行股改，引入合伙人制度，推动企业经营这几年迈上了一个新台阶。“产值是一方面，更重要的是把企业的平台搭建好，把价值做大。”   着力开发生产高附加值弹簧 信兆朗生产车间内，CNC电脑数控弹簧机、自动化铆压编带设备，自动铆片设备，以及膜厚测试仪等检测设备满负荷运转，将一条条钢丝制造成各个规格的弹簧。蔡朗明告诉记者，公司现在正在大力开发生产高附加值弹簧。2019年引进的自动化一体成型触摸弹簧生产设备大幅提升了企业竞争力。信兆朗还重点推出了为客户提供量身定制的全AI高速插件弹簧。 “我们要把锚定弹簧这个细分领域做深做透。”蔡朗明表示，作为一家高新技术企业，信兆朗坚持走“专精特新”之路。2019年已经实现全自动化SMT载带工艺，通过创新搭建知识产权护城河，为客户提供更多品类优质的弹簧产品。据了解，现在信兆朗已有14项专利，其中包含4项发明专利，正在申报佛山市专精特新企业。“现在公司生产的AI高速插件，从立项到开发成功达8个月，这在五金加工领域是比较长的，其间遇到了很多困难，但我们一直没有放弃，要持续不断改善生产工艺，最终为客户提供价格更低廉，品质更好的产品。” 蔡朗明透露，现在国内外客户超过5000家，直接或间接合作的客户包括美的、格力等家电巨头和伊莱克斯、博世等跨国企业。今年企业还要投资近800万元增加生产设备，同时着力开发以上市企业为主的优质客户。“前几年在国外市场的耕耘初见效果。”蔡朗明告诉记者，信兆朗在俄罗斯、波兰、斯洛文利亚、芬兰、西班牙等欧洲国家的订单也渐渐多起来，未来企业要加速走出去。