Precision Forming Process And Die Design For Water Pump Plier Based On CWR

Plier tools, a kind of hardware tools, have a wide application.? They? are?commenly? used? in? installation and repair for cars, explosion engines, agricultural machinery and indoor pipelines etc. But the mostly used forming process has serious disadvantages because of its traditional and backward blocking technology. Along with the development of the forming technology, new types of forming technology are applied and popularized, so a new forming process substituting for the old one for water pump pliers were put forward . In the new process ,the technology of Cross-Wedge- Rolling blocking and small-flash die forging were used, which can get precise preforms and reduce material loss. And it would create an economic efficient production mode.One type of water pump plier was chose to be the research object in this paper. The new forming process for this plier were analyzed and calculated. At the same time the feasibility of the new process was demonstrated. Preforms for various forming stages were designed.By using the FEM software DEFORM-3D, CWR forming laws were studied, which is including the Stress and strain distribution in sections of up wedge and widening, the impact of the main process parameters on the forming force and the approximate relationship between the axial force and the parameters. The summed laws were the guide for the CWR mold design, and the optimal process parameters were designed.The whole forming process of CWR blocking was simulated by DEFORM-3D.The forming turned out to be good. It provided us a base for the rationality of the designed process parameters and a positive and effective guidance for CWR mold design.