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Stainless steel precision casting tempering has two purposes: one is to eliminate the stress generated during quenching; the two feet promote the decomposition and transformation of martensite and retained austenite metastable structure after quenching. The tempering temperature is usually below the eutectoid transformation temperature, up to about 650 ° C, and the holding time is not less than 2 h. As the tempering temperature increases, the martensite precipitates carbon from the supersaturated state of carbon to form a dispersed, fine carbide. Martensite eventually forms a massive ferrite, so with tempering As the temperature rises, the hardness of the "stainless steel precision cast" steel will gradually decrease. A problem that cannot be ignored in the tempering process is: fire brittleness problem, which is common in the joint steel, has a temper brittleness in the low temperature zone of 250 ~ 400 °C; there is a back in the high temperature zone of 450 ~ 650 °C Fire brittleness. Low temperature temper brittleness occurs when carbon atoms are precipitated from martensite and a thin layer of carbide is formed at the martensite grain boundary. This carbide is called e carbide and its structure and composition are different from carburization. The body, which causes a drop in impact toughness, is called low temperature temper brittleness. When the concave fire continues to heat up and form a stable tempered structure, the temper brittleness will no longer appear when it is tempered again, so it is called "irreversible temper brittleness". The high temperature temper brittleness which occurs at 450-650 °C has a great relationship with the cooling rate. The slow cooling has temper brittleness, and the rapid cooling has no temper brittleness. High temperature temper brittleness is reversible. As long as the steel that has eliminated temper brittleness is heated again to 600" (: above, then slowly cooled, temper brittleness will still occur. Therefore, this temper brittleness may be related to the grain boundary The precipitation of low-melting brittle compounds is related. In some alloy steels, the addition of molybdenum can eliminate temper brittleness, which means low-temperature temper brittleness. Some people think that molybdenum may form composite carbide with some alloying elements, which offsets the adverse effects of carbon carbide. Caused. According to the requirements of casting performance, the tempering temperature is divided into three types: low, medium and high. (1) Low temperature tempering The tempering temperature is 150 to 250 ° C, and the obtained structure is the same fire martensite, that is, a part of carbon is precipitated in the supersaturated martensite, and carbides are formed around the martensite. This steel has a small amount of carbon and has less supersaturated carbon in the martensite. Therefore, the tempered martensite itself has good toughness, precipitation and stabilization of carbides, and further improves the strength of the steel. hardness. (2) Medium temperature tempering The tempering temperature is 350-500 ° C, and the tempering structure is tempered troostite, which has good strength and toughness. This tempering process is widely used in low alloy cast steel. (3) High temperature tempering The tempering temperature is 500-650 ° C, and the tempering structure is diffused, granular sorbite. The quenching + high temperature tempering process is called quenching and tempering. It is suitable for low alloy steels with multiple components of strong carbide forming elements and has high toughness.

High-purity graphite has attracted wide attention because of its excellent performance. It is an ideal inorganic non-metallic material, which is widely used in production. High-purity graphite is very used and is used in many fields. It can be used. Used in advanced refractory materials and military, paint, light industry, chemical fertilizer industry catalyst additives, etc., deep processing of high-purity graphite, can also produce graphite sealing materials, composite materials, graphite emulsion, graphite anti-wear additives and other high-tech products, Used as an important non-metallic mineral raw material in the industrial sector. High-purity graphite is the preferred product in production due to its excellent performance. As a high-quality milling equipment in the field of graphite processing, the vertical roller mill made by SBM is a high-quality equipment specially designed for the status of graphite processing. It is of great help and promotion for improving the efficiency of graphite reprocessing and creating greater value. .

vertical roller mill grinding machine is a high-quality equipment specially designed for non-metal scale powder making of SBM heavy machine. It has high-quality, high-efficiency, environmentally-friendly production, energy saving and other high-quality features. It is very popular in the field of high-purity graphite powder processing. As a professional manufacturer of vertical roller mills, SBM heavy machine is customer-centered. According to the price and selection configuration of high-purity graphite vertical roller mills customized by each customer site, it is more scientific and reasonable. A must-have device for improving graphite processing efficiency.

SBM heavy machine vertical roller mill is an advanced equipment that learns to introduce more advanced milling technology at home and abroad. After years of painstaking research and production, it has successfully broken through the traditional mill's low output, high energy consumption and maintenance. High cost and other problems, the ability to adapt to materials is very strong, can produce a variety of production capacity for different materials, to meet the production needs of graphite powder in different industries, and therefore is the ideal equipment in the field of graphite processing.

In industrial production, the quality of its Raymond mill is the most critical. At the same time, most of the reasons that affect the production efficiency of the equipment during the production process are the performance of the Raymond mill. So, what should users pay attention to when producing Raymond mill?

First of all, Raymond mills are widely used in various industries, so that their production efficiency has attracted the attention of many users. As a manufacturer, in the production process, more attention should be paid to ensure that production is guaranteed. At the same time, equipment performance is important for a project. If the production cannot be completed in use, the equipment is not suitable.

Secondly, when the user purchases the appropriate equipment, there are many problems in the production, indicating that the equipment is not properly used, so that its performance is not fully exerted, resulting in the entire project can not be carried out. For the use of Raymond mills, proper operation and maintenance are required to achieve good performance.

Once again, when using the Raymond mill, pay attention to the cooperation of the parts and components, and there will be no problems during production. At the same time, in order to extend the service life and effect of the equipment, the user needs to do the corresponding lubrication work, which improves the production efficiency to a certain extent and provides assistance to the user.

Then, in operation, in order to produce efficiency and production efficiency, it is necessary to pay attention to the uniformity of the feed during production, and it is not possible to dope other impurities, especially hard impurities, thereby damaging the use of the equipment. At the same time, attention should be paid to the vibration of the equipment. During production, a large amount of vibration will occur, and corresponding measures need to be taken to improve this phenomenon. When the Raymond mill is out of the material, if it cannot be discharged normally, it will malfunction and should be repaired.

The casting process of Raymond Mill equipment is an important factor to determine the quality of wear-resisting parts. Today, Shanghai SBM Heavy Industry Co., Ltd. Introduces three factors that affect the casting process of Raymond mill.

1. The quality of raw materials used in casting directly determines the quality of Raymond mill. For example, the quality of refractory materials, fuel, flux and casting sand is not up to standard, so that defects such as pinhole, slag inclusion and sand sticking occur in cast iron, which will affect the quality of cast iron and make cast iron scrap.

2. Reasonable process operation rules to improve the technical level of workers. In production, the quality of Raymond Mill castings should be controlled. At the same time, from raw materials, auxiliary materials to each product control and inspection process. For each process must be strictly in accordance with the process code, and finally the quality of the finished castings are inspected. Good materials, coupled with reasonable process operation, can produce high-quality products.

3. According to the structure of casting parts, the quality and size of wear-resisting parts, the characteristics of casting alloy and the production conditions, the proper casting process should be selected and the casting ribs, gating system and risers should be reasonably set up to ensure the good cast iron parts.

Above are three factors about the casting technology of Raymond mill. In production, the problem of abrasion is unavoidable. Good raw materials, reasonable operation rules and casting technology are needed to improve the quality of abrasion-resistant parts of Raymond mill.

The roller crusher has the characteristics of reliable operation, simple maintenance, low operating cost, adjustable size of discharge material, etc. It can be divided into two-roll SBM Cone Crusher and four-roll crusher according to the number of rolls, which can be widely used in cement, metallurgy and chemical industry. , power, coal and other industries for brittle and tough materials processing. The roller crusher is used for crushing and fine crushing of various medium hardness below ore and rock in the industrial sectors such as mineral processing, chemistry, cement and building materials. The following are important factors affecting the production capacity of the roller crusher:

1. The crushing parts (hammer head and jaw plate) of the crushing equipment are getting better and better, and the crushing capacity is large. If it is not wear-resistant, it will affect the crushing capacity;

2. The shaker after the crushing, the rotary kiln, the fineness of the fine crushed material, the fineness requirement is high, that is, the finer the material required to be broken, the smaller the crushing ability;

3, the composition of the material, the more the fines contained in the material before the crushing, the more the crushing, because these fine powders are easy to adhere to affect the transport. For the content of fine powder, it should be sieved once in advance;

4, the hardness of the material, the harder the material is broken, the more difficult it is, and the more serious the wear on the equipment. The speed of breaking is slow and the breaking ability is small;

5, the humidity of the material, that is, the moisture contained in the material is large, the material is easy to adhere in the crusher, and it is easy to block during the feeding process, resulting in reduced crushing capacity;

6. The viscosity of the material, that is, the greater the viscosity of the material, the easier it is to adhere.