The quality of the roller skin of the briquetting machine directly determines the service life of the briquetting machine. The hardness of the roller skin is the most important parameter to measure the quality of the roller skin of the briquetting machine. The hardness of the roller skin depends on the alloy steel grade selected for the roller skin and the final level of heat treatment process.
Firstly, the blank is made according to the drawing of the roll skin, and then processed by turning, so that all sides are clean and eight sides are smooth. The next step is to carve the ball socket on the circumference of the roller skin. Of course, the size and shape of the ball socket need to be determined according to the diameter of the roller skin and the pressed material and other factors. The latter process is heat treatment, which is also the most critical process. In the case of the same raw material of the roll skin, the hardness of the roll skin is determined by the heat treatment.
Ball press roller skins can be divided into two types in terms of technology: casting and forging. The commonly used steel grade for casting roll skin is 65 manganese alloy, the cost is relatively low, but the hardness of the roll skin is not too high, not very wear-resistant, suitable for pressing fine materials such as coal powder and clay. The commonly used steel grade for forging roller skins is 92 chromium molybdenum, which is relatively high in price and cost, but the hardness of the made roller skins is also relatively high, which can reach above HRC62, and is suitable for pressing rough materials such as iron powder and metal ore powder.
1. The material of the roller skin of the briquetting machine
The material of the roller skin of the briquetting machine is divided into 65 manganese, 9 chromium and 2 molybdenum, high chromium alloy and so on. When pressing different materials, different roller skins should be selected: 65 manganese roller skins are more popular and belong to steel castings with low cost. , can suppress coal powder, coke powder, charcoal powder and other materials; 9 chromium 2 molybdenum, high chromium alloy briquette machine pressure rollers are forged parts, mainly used in medium and large briquette briquetting machines with high output, and can be used to suppress ore powder, iron concentrate powder, magnesium oxide powder, laterite nickel ore, etc.
65 manganese is a common spring steel, which has high hardenability, and the surface decarburization tendency is smaller than that of silicon steel. The comprehensive mechanical properties after heat treatment are better than carbon steel, but it has overheating sensitivity and temper brittleness. Bearing steel has high hardness, average hardness, high elastic limit, high contact fatigue strength, necessary toughness, certain hardenability, and corrosion resistance in atmospheric lubricants. From the above material analysis, it is not difficult to see that bearing steel as a roll skin material will be more economical and durable than 65Mn, and have a longer service life. It is the best choice for the roll skin material of fluorite powder briquetting machines and other equipment.
2. The fit of the roller skin of the briquetting machine
Under normal circumstances, it is recommended to use alloy roller skins for ball briquetting machines, especially mineral powder briquetting machines, but good materials must also have good manufacturing processes. In fact, having a pair of qualified standard roller skins does not mean that you can have a good equipment, because whether the roller skin can be used depends not only on the quality and material of the roller skin, but also on whether the two roller skins are completely matched. It is precisely because the roller skin does not fit completely, so the product pressed and formed by the ball briquetting machine cannot become a ball with a qualified shape. The performance of the non-fit roller skin is mainly due to the fact that the ball socket on the roller skin cannot be aligned, and the ball socket is formed. Directly affect the parts, only by aligning the ball socket can the shape of the molded ball meet the requirements.
3. Heat treatment of roller skin of briquetting machine
The roll skin of the coal briquette machine is generally made of alloy steel, and the manufacturing process is forging. The blank roll skin that has been forged at high temperature must first be precisely processed on a round car. First, the inner diameter and outer diameter must be processed. The roller skin is placed on the bed to prepare the mold according to the customer's needs, and the most important thing is heat treatment. If the roller skin has not undergone surface heat treatment, the service life of the roller skin will be greatly reduced, but the area of the roller skin is relatively large. During heat treatment, it is necessary to prevent the part of the roller skin from being heated to cause bursting.
The central mechanical equipment of the briquette forming equipment is the briquetting machine, and the key component that affects the working efficiency of the briquetting machine is the briquetting roller. The roller occupies such an important position in the work of the briquetting machine, and its life and material performance are very large. To a certain extent, the quality of the briquetting machine equipment and the work efficiency are determined. When purchasing, the customer must pay more attention to the roller skin material, processing technology, fit and other related matters of the briquetting machine to ensure the quality of the whole machine. Effectively reduce the cost of equipment and improve the profit and efficiency of the production line.
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