Product assembling quality risk analysis approach based on RQR chain

The assembling process is the final production step, its quality is the decisive factor of the reliability of the finished product. Along with the release of ISO 9001: 2015, the risk of thinking is firstly cited, and the risk oriented quality analysis should be extended to the assembling process. Therefore, in order to improve the reliability of the final product, the risk thinking is needed to be introduced into the management and analysis of the assembling quality. Therefore, based on the proposed RQR chain, a reliability oriented quality risk analysis method is presented for the product assembling process. Firstly, the RQR assembling chain is introduced in this paper, and its three basic management objects of system reliability (R), assembling process quality (Q) and product reliability (R) are expounded. Secondly, based on the co-effect in the RQR chain, a quality framework of risk control is put forward. Thirdly, the impact of noncritical quality characteristic variations on key quality characteristics (KQC) is analyzed, and then the decline degree of the assembling product reliability caused by the KQCs variation is quantified. Then, according to the impact of the proportion, the risk factor K is determined, and then the quantitative relationship between assembling variation and product quality accident risk is established. Finally, a quality risk analysis case of a lifting equipment assembling process is given to verify the availability of the approach.