卡扣是我们结构设计中一种常见的联接方式，它成本低廉，而且设计巧妙。我总结了几点需要注意的地方： The buckle is a common form of connection in our structural design, which is inexpensive and cleverly designed. Here are a few things to note: 1.弹性。这个太重要了，卡扣没有了弹性，它变失去了它的左右，卡扣是靠变形来卡入。这个变形影响因素有2个，一个是卡扣的壁厚，一个卡扣的长度。 1. The elasticity. This is so important that the card is not elastic, it loses its left and right, and the card is in the form of the distortion. This deformation affects two factors, one of which is the thickness of the card and the length of a card. 2.注意卡扣的宽度，太长不太好扣，太短没有强度。 Note the width of the buckle, too long and not too tight, too short for strength. 3.注意扣合量，扣合量是根据弹性来变的，还分为死扣和活扣。有很多教程或网上说扣合量大于等于0.6mm就是死扣，小于等于就是活扣。我个人理解没有必要弄那么死，根据产品特点和卡扣的弹性变量来说的。下面是一个卡扣的设计预留间隙，卡扣我觉得可以开始做的预留点，然后加胶。 Note the amount of the clasp, which is varying according to elasticity, and is also divided into buckle and buckle. There are many tutorials or online that say that the amount of the clasp is greater than or equal to 0.6 mm is the dead button, less than or equal to the buckle. I personally understand that there is no need to be so dead, based on the product features and the elastic variable of the card. Here is a button for the design of a card button, which I think can be done before adding the glue.