卡扣主要作用是连接前后壳，稳定间隙，方便组装，节约单价成本。缺点是没有螺钉强度好，可靠性高。

The main function of the card is the front and rear casing, stable clearance, easy assembly and cost of unit cost. The disadvantage is that there are no screws and good reliability.

当然，只要卡扣分布与强度设计好，再结合合理的螺钉位置布局，就可以打造出一套完美的产品结构。即满足了结构强度，也满足了成本需求，更满足了装配要求，是不二选择的最佳方式，卡扣在整个产品结构当中主要起辅助作用。

Of course, as long as the card buckle distribution and the strength design is good, combine reasonable screw position layout, can build a perfect product structure. Which satisfy the structural strength, but also meet the demand of the cost, more satisfying the requirements of assembly, is the best way to choice, card buckle main auxiliary role in the middle of the whole product structure.