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Abstract: To solve the problem of the blowhole defects in the center and on the high chromium cast iron grinding ball’s surface, the influence of the two filling modes—one-ball mold and four-ball mold on blowhole defects were analyzed. The result indicated that the four-ball m old’s venting effect with parting—line gating system is better. The impact […]
According to the hardness value and the impact toughness data, the hardness trend charts are drawn: 1; the impact toughness trend Charts as follows: Fig. 2.
Abstract：The effects of chemical composition and heat treatment on properties of the wear-resistant grinding balls were studied through hardness and impelling strength test, metallographic structure analysis. The study used an orthogonal test instead of a fixed variable method for a shorter experimental cost and time. The experimental results show that the wear-resistant grinding balls show […]
3.1 Matrix structure (1) Carbide and Martensite The microstructure of the chromium grinding balls are mainly carbide, and the carbide of high hardness in white cast iron is Fe3C, Cr3C, (Fe, CR)3C, Cr7C3, Cr22C6, WC, TiC, etc. , therefore, the size, number, distribution, shape of the grinding ball has a direct impact on the performance.
ZHANG Zhou1，LUO You-gen2，YING Gen-peng3 （1.Hangzhou Xuelin Science- Technology Development Service, Hangzhou 310012, China; 2. Longyou Hengshan Steel Ball Factory, Longyou 324406, China; 3. Hangzhou Aobao Chemical Co. Ltd., Hangzhou 310012, China） Abstract：A brief introduction was made to the chemical compositions, matrix structure, mechanical properties, and melting process of chromium series cast iron grinding balls. The […]
2.1 High and low chrome balls contrast The production practice shows that the strength and wear resistance of the low chrome grinding balls are low and easy to be broken, which makes the broken ball rate and the out-of-round rate higher and has a particular influence on the grinding effect. The surface of high chrome […]
Abstract: To solve the problem that the ball unit consumption is too high and the particle size of grinding products shifts to coarse size after the reformation of the grinding system and the optimization of the ball diameter ratio in a molybdenum concentrator. The comparison of chemical composition and mechanical properties between High Chrome Grinding […]
1) The technological measures to prevent subcutaneous stomata mainly include: 2) Desulfurization treatment. The so-called desulphurization, that is, as far as possible, the sulfur in the molten iron is transferred to the slag, and then eliminated, the less FeS in the molten iron, the higher the desulphurization efficiency, appropriately increasing the basicity of the desulphurized […]
The subcutaneous blowhole is a common casting defect in wet-type Ductile Iron Castings, so it has a prevalent deficiency and is especially sensitive to thin-walled castings. The reason is that the thin-walled castings have a fast solidification speed. The gas can not form bubbles in time, and the thick-walled castings have a slow solidification speed […]
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