36results about How to "Prevent gestational decline" patented technology

The invention discloses a die cavity structure of a back box body casing of a wind power generating unit and a method. The structure comprises a casting system, a back box body die cavity and an air outlet opening, wherein the air outlet opening is formed in the back box body die cavity; the casting system comprises a sprue and a cross pouring gate communicating with the sprue; the cross pouring gate sequentially communicates with a first transition pouring gate, a second transition pouring gate, a third transition pouring gate and a fourth transition pouring gate; the fourth transition pouring gate communicates with the back box body die cavity through a flow gate; a first buffer pouring gate is arranged on the cross pouring gate; the ratio of the cross section area of the first buffer pouring gate to the cross section area of the sprue is 1:(0.60 to0.75). The die cavity structure has the advantages that the iron liquid mold filling instability and turbulence generated by the metal liquid in the casting process can be reduced; the quality stability of the casting can be improved; the slag inclusion defects and air hole defects are reduced; the high-quality requirements can be met.

The invention discloses a preparing method of a nucleating agent for a cam shaft. The preparing method comprises the following steps that 60-75% of Si, 0.01-1.0% of Al, 0.05-0.5% of Ca, 0.1-1.0% of Ba, 3-5% of Cr, 0.03-0.05% of V, 5-8% of Nd, 0-1% of Mn, 0.5-1% of carburant and the balance Fe which are evenly mixed are melted, stirred, poured, cooled rapidly and crushed and then are mixed with Fe3O4 powder to be pressed into pellets to be crushed. The invention further discloses specific application of the nucleating agent for the cam shaft. By means of the nucleating agent for the cam shaft, the comprehensive performance of the cam shaft can be improved, and the nucleating efficiency is improved.

The invention relates to a synthesis and preparation process for a high-silicon-molybdenum ductile iron material. The synthesis and preparation process specially comprises the following steps that raw materials are prepared, and the raw materials comprise, by mass, 60%-70% of scrap steel, 25%-35% of cast iron, 1%-1.2% of silicon iron, 1%-1.3% of ferro-molybdenum and 2%-2.5% of carburant; in the raw material melting process, furnace burdens are added in three batches; all the cast iron and 1 / 3 mass part of scrap steel are added in the first batch of furnace burdens, 5 / 11 mass part of carburant and 1 / 3 mass part of scrap steel are added in the second batch of furnace burdens, and 5 / 11 mass part of carburant and 1 / 3 mass part of scrap steel are added in the third batch of furnace burdens; after the third batch of furnace burdens are completely molten down, all the silicon iron and ferro-molybdenum are added, and when the temperature of molten iron rises to 1400-1410 DEG C, the remaining 1 / 11 mass part of carburant is added in a mirror surface mode after slagging-off impurity removal; and sampling analysis, blending, tapping, nodulizing and inoculation treatment are performed until pouring is completed. According to the process, the scrap steel is used as a main raw material, and the joint carbon adding mode of middle adding and mirror surface adding is adopted for preparing high-silicon-molybdenum ductile cast iron with high strength and high impact toughness.

The invention discloses a preparation method for controlling the eutectic degree of molten iron to optimize the shrinkage cavity of castings, comprising the following steps: S1. Measuring the eutectic degree of the original molten iron: measuring the solidification temperature curve of the molten iron in a sample cup by using a thermal analysis method , Observing the phase diagram, according to the principle of phase transition, it is known that the liquidus temperature is consistent with the solidus temperature, then the intersection point of the composition and temperature is the eutectic point, and the carbon equivalent, silicon equivalent and phosphorus content of the eutectic point are measured by instruments. The invention also proposes a system for controlling the eutectic degree of molten iron to optimize the shrinkage cavity of castings. The system adopts a cupola furnace for furnace material smelting, and uses an H27880 molten iron quality management instrument to detect components of molten iron. The present invention uses high-precision thermal analysis and temperature detection means to continuously optimize the control targets of eutectic degree, maturity, and superheat of molten iron, starting from preventing inoculation recession, eliminating proanatoid graphite structure, and optimizing the solidification structure of molten iron step by step , reduce shrinkage porosity, improve mechanical properties, reduce energy consumption, and maximize benefits.