.4 Cr5mosiv Steel Liquid Forging Forging Die Quality Analysis And Applied Research

Liquid forging is a new metal-forming technology. If forging die can be manufactured with this technology, the useless forging die can be remelted. Thus a good deal of the die steel will be more accurate than that produced by forging, and the machining process is also reduced, the manufacture process will be shortened. Based on Dongfeng Motor Company's practice need, it has great practical and theoretical significance to develop the experimental on squeeze casting for 4Cr5MoSiV steel forging die. It is difficult. There are many difficulties in controlling the quality of forging die. So it is necessary to analyze and study it.The quality of forging die manufactured by liquid forging is studied in this paper. The main contents include: the experiment condition and process are introduced simply; the alloy component is inspected with Spectrum Scanner; the structure of the product in different heat treatment is observed and its mechanical properties is tested; the effect on the structure and mechanical properties when added in the rare earth are studied; the quality of forging die manufactured by liquid forging on the surface and its defects are analyzed in detail and several methods to decrease the defects are pointed out.The quality of the forging die manufactured by liquid forging is investigated. Results show that the alloy component can be controlled in the standard range if the surface of rejected forging die can be cleared up and it is melted in alkalescence furnace. In addition, the ferroalloy should be added before the melted steel is irrigated. The original structure of the 4Cr5MoSiV steel forging die made by liquid forging is martensite. Its surface rigidity can reach 52-54HRC and 210-226HB after annealed. So, it can be machined easily . Fine crystal grain can be acquired and the deflection can be improved by adding rare earth. The defects of the product include lard, pore, shrinkage loose and cracks. The lard has been eliminated through choose valid dope and the shrinkage loose has been solved after the tonnage of hydraulic pressure machine enhanced. But the crack isn't solved in this experiment.