The filling rate calculation formula of the grinding body is as follows: The filling rate of the grinding body has a great influence on the output and grinding efficiency of the mill. The filling rate is also known as the loading capacity. The calculation ratio is the ratio of the cross-sectional area of the loaded grinding body divided by the cross-sectional area in the mill. The calculation can be based on the inner diameter of the mill and the distance from the surface of the grinding body to the highest point of the lining of the mill. If the lining plate is a special shape, such as wave type or step type, it must be reasonably corrected and the average value should be selected.
View More →High chromium ball, medium chromium ball, low chromium ball, forging steel ball performance indicators 1, high chromium ball quality index: The national standard requires high chromium ball hardness (HRC) must be more than 58, the impact value AK ≥3.OJ/cm 2, if the hardness of high chromium ball must be high temperature quenching + tempering treatment (at present, the domestic high chromium ball quenching oil quenching and wind quenching two kinds of quenching), If the test hardness (HRC) is below 54, it indicates that the high chromium ball has not been hardened. 2, the quality index of chromium ball: The impact value AK ≥ 2.0j /cm 2. The hardness of the chromium ball (HRC) must be ≥47. In order to ensure the quality of the steel ball, the chromium ball needs to be treated with high temperature tempering (in order to eliminate the casting stress). Such as the steel ball surface is dark red indicates that the product has been high temperature tempering, such as the steel ball surface is still metal color indicates that the product has no high temperature tempering. 3, low chromium ball quality index: Chromium content 0.5%~2.5%, carbon content between 1.80% and 3.20% are called low chromium ball, the national standard requires low chromium ball hardness (HRC) must be more than 45, impact value AK ≥1.5J/cm 2, in order to ensure the quality of steel ball low chromium ball also need to adopt high temperature tempering treatment (in order to eliminate casting stress), Such as the steel ball surface is dark red indicates that the product has been high temperature tempering, such as the steel ball surface is still metal color indicates that the product has no high temperature tempering.
View More →How a ball mill works Working principle of the ball mill | ball mill ball mill ball mill factory price Ball mill is mainly composed of cylindrical simple rest, zi cap, bearing and transmission ring and other parts, simple rest into the diameter of 25-150mm steel ball or steel rod, known as the grinding medium, its loading capacity for the whole simplified has a larger volume of 25%-50%. The end cover at both ends is connected with the flange at the end of the cylinder body using screws. The middle of the end cover is perforated, which is called the hollow journal. The hollow journal is supported on the bearing and can be rotated simply. The cylinder rest is also fixed with a large gear ring 4. In the drive system, the motor drives the big gear ring and cylinder rest through coupling, reducer and pinion gear, slowly turning. When the mill rotates, the grinding medium rises to a certain height with the mill, and then falls down in a parabola, as shown in the right figure in Figure 1-3.
View More →The technology is accurate 1 scope This standard specifies the technical index of ball mill grinding body group procurement, the statistical accounting method of grinding body loss, and management requirements. 2 Normative reference documents The provisions of the following documents are incorporated into this international standard by reference. JC/T533-2004 building materials industry standard "building materials industry chromium alloy casting grinding ball". 3 Terms and definitions The following terms and definitions apply to this standard 3.1 ball consumption During the statistical period (annual), the grinding mass consumed by the grinding system to produce each ton of material (raw material, pulverized coal or raw material) is expressed by M, and the unit is g /t material (raw material, pulverized coal and cement).
View More →Casting steel ball production technology Wear-resistant steel ball classification, according to the different production process, can be divided into: hot rolled steel ball, Forging steel ball and casting steel ball three categories. And casting steel balls, according to the amount of chromium content in the ingredients, can be divided into high chromium alloy casting steel balls, medium chromium alloy casting steel balls and low chromium alloy casting steel balls. Medium and low chromium cast steel balls have poor wear resistance, high breakage rate, and are cheap in price, but they have higher wear and lower comprehensive price, so they are not recommended. High chromium alloy cast steel ball, due to the addition of chromium element, has higher hardness, is a kind of high-quality wear-resistant material, cement, new building materials and other dry ball mills have been widely used. Generally speaking, the greater the hardness of the wear-resistant steel ball its wear resistance is better. To improve the wear resistance of the steel ball, it is necessary to increase the hardness of the wear-resistant steel ball, but the increase of hardness will inevitably cause the reduction of the impact toughness of the wear-resistant steel ball, and the hardness of the steel ball also needs to take into account the hardness and material of the wear-resistant lining plate. Therefore, how to combine the hardness and toughness of steel balls is the key to improve the wear resistance of cast steel balls. For example, the solidification sequence and feeding conditions of high chromium alloy steel balls should be properly adjusted, so as to make the steel balls get dense inside and reduce the phenomenon of crystal coarser. The heat treatment process determines the mechanical properties and carbide distribution. In the composition of cast steel ball, there are quantitative chromium and alloy elements, how to make these alloy elements form hard carbide, so as to play a role, is also an important factor must be considered in the formulation of heat treatment process. In short, reasonable production technology and strict quality control means are the prerequisite to determine the performance of the cast steel ball.
View More →How does the ball mill add steel balls in proportion to the size of steel balls This is based on the ball mill diameter, ore hardness, ore particle size into the ball mill, ball hardness (quality), ball mill speed and other factors to determine. When the type of the ball mill is determined, the speed of the ball mill is also set. The hardness of ore can be measured. Into the ball mill ore particle size, by changing the screen size to determine. How to add steel balls to the ball mill in proportion to the size of steel balls? Now the author summarizes the perennial practice and theoretical experience as follows:
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