冷镦钢自冲铆钉的热处理工艺试验

Experimental study of heat treatment process of cold heading steel self piercing rivets

利用网带式连续炉对SWRCH35K冷镦钢自冲铆钉进行多炉次淬火、回火热处理工艺试验,对其硬度进行检验。结果表明,当SWRCH35K冷镦钢自冲铆钉在连续炉中900℃微渗碳加热后,经860℃×90 min淬火+(200~215)℃×80 min回火处理的硬度值(≥530 HV)满足技术要求,自冲铆钉保持锋利的铆钉刃口同时又具有良好的基体塑性,铆接效果良好。

In order to test the hardness of the self piercing rivets made of the SWRCH35K cold heading steel,quenching and tempering heat treatment processes were carried out in a mesh belt continuous furnace.The results show that when the rivets are quenched by heating at 860℃for 90 min and tempered at different temperatures in the range of(200-215)℃for 80 min after micro-carburizing at 900℃,the hardness value(≥530 HV1)can meet the technical requirements,and at the same time,the self piercing rivets keep sharp edge and good plasticity of matrix,with good riveting effect.