As the main grinding medium, steel ball plays a vital role in the process index and final grinding fineness. It is easy to understand and understand the steel ball, and it is convenient for quality and cheap bulk purchase to serve the grinding production. Many mining enterprise external committees sampled and analyzed the various performance indexes of pre-purchased steel balls, and selected the steel ball manufacturers to sign the tonnage contract consumption contract, and settled the steel ball consumption by the processing capacity of the plant. It was simple and practical, and achieved a win-win situation between supply and demand.
Steel balls are divided into forged steel balls, cast steel balls and ground steel balls according to the production process. Forged steel balls, the use of round cutting section with hammer forged, broken less than 1%, good wear resistance, low price, high cost; ball casting, chromium alloy is the main component, the intensity ratio of the density of wrought The steel ball is low and the breaking rate is relatively high. The types are shown in the table below. The sales staff of a steel ball factory called the cast steel ball a forged steel ball. The consumption of a ton of mine was 0.9 kg and signed a contract with a selected factory in southern Shaanxi. The result was 1.3 kg, and the steel ball was lost.
The steel ball is made of carbon, chromium, manganese , molybdenum, etc., and is produced by forging, spinning, rolling and casting. It is the ball for crushing industrial mines today. "There must be crushing in the industry." Grinding and grinding is inseparable from steel balls. Cast iron ball prominent feature is the low price, ease of in situ casting. Previously, mining companies used cast iron balls nearby, and some tons of mines cost two or three kilograms. Later, with the use of steel balls, cast iron balls were replaced. However, the price of steel balls is 40%-50% higher than that of cast iron balls. The metal composition is different and the processing is complicated. At that time, in order to overcome the shortcomings of low strength and poor wear resistance of iron balls, some manufacturers added rare earth, magnesium and other elements to the cast iron in the direction of the cast iron, and also cast rare earth magnesium manganese cast iron balls, which was relatively good at the time.
There is no obvious difference in the appearance of steel balls, but the actual efficiency is uneven due to factors such as raw materials, heat treatment process and equipment automation level. Common impact force, grinding force, surface hardness and core hardness are measured. The impact energy generated by the steel ball is generally not less than 4.0 J/cm 2 , the hardness of the ball table is not less than 58 HRC, and the hardness difference of the watch core is controlled at 2 HRC. The impact fatigue life is not less than 15,000 times, and the grinding point is contacted by the point surface of the steel ball to improve the pulverization efficiency.
The wear-resistant steel ball has high hardness, good wear resistance, is not easy to be broken, and does not lose roundness. It achieves the perfect combination of hardness and toughness. It is hard and tough inside. The production efficiency is greatly improved after use, and the daily steel ball replenishment is greatly reduced. Each ton of steel balls can reduce the electricity consumption of mineral products by about 5%, and reduce the consumption of materials by 15%-20%, which truly reduces costs and increases efficiency. One of the wear-resistant steel balls of Elite steel ball, the material is B2, the percentage (%) carbon is 0.76-0.82, the silicon is 0.17-0.35, the manganese is 0.72-0.80, and the chromium is 0.5-0.6. The overall hardness is relatively high and relatively uniform. After use, the surface hardness reaches and continues to maintain Rockwell hardness HCR60-65, impact toughness is greater than 12 J/cm2, and the ball diameter is 25 mm-180 mm. The manufacturer is directly capable of direct production in China. One of the companies with a diameter of 80 mm or more.
The influence of material density, manufacturing method and post-production process. The density of different materials is different, the density of steel is larger than that of cast iron, and the alloy steel is different according to the density and content of main alloying elements. The rolled and forged steel balls are densely organized, so the density is large, and the cast steel balls are cast. The structure of cast iron balls or alloy balls is dense, and some even have pores, so the density is smaller. These balls are easily broken into pieces during grinding, so that the impact friction between the ball and the ball changes from point to point. Grinding; the post-process of steel ball production, namely automatic cleaning of steel balls, appearance inspection, automatic rust prevention, counting and packaging, are all key factors affecting the quality of steel balls. The appearance of steel balls includes surface scratches, rust, Surface spots, etc.
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