Bed casting
The machine tool bed is a large casting, which adopts high strength cast iron HT250-300 with good toughness and long service life. It is widely used in the processing of instruments, electronics, light industry, standard parts, bearing industry, Auto Parts industry and other parts, especially suitable for non-ferrous metals.
Features of machine tool bed: Machine Bed,Cast Iron Base,Large Cast Iron Machine Tool Base,Nodular Cast Iron Machine Tool Castings Baizhu Network Technology Co., Ltd. , https://www.baizhunet.com
An analysis of the soil's bulk density instrument found that the soil bulk density expressed in grams of 1 cubic centimeter of dry soil including pores was the same in value. Soils with a large amount of minerals and poor structure (such as sandy soil) have a soil volume ratio of 1.4-1.7, and soils with a large amount of organic matter and good structure (such as agricultural soil) are between 1.1-1.4. The specific volume of soil volume can be used to calculate the weight of a certain area of ​​cultivated soil layer and soil porosity; it can also be used as one of indicators of soil maturity degree, and the soil with a higher degree of ripening has a smaller volume specific gravity.
Soil bulk density is determined by the amount of soil pores and soil solids. Based on the soil bulk density, the weight of any unit soil can be calculated. The formula is: soil weight = volume × volume weight, for example, 667m2 of arable land, 0.15m thick plough layer, soil bulk density of 1.34g/cm3 (1340kg/m3, 1.34T/m3), soil weight: 667 × 0.15 × 1.34 × 1000=134067 kg. It is also possible to directly use the soil bulk density meter to measure the bulk density and to obtain the data directly to avoid calculation errors.
(1) Good performance and shock absorption. Graphite in cast iron is beneficial to lubrication and oil storage, so it is powerful. Similarly, due to the existence of graphite, the shock absorption of gray cast iron is better than that of steel.
(2) Powerful process. Because of the high carbon content of gray cast iron, which is close to the eutectic composition, the melting point is relatively low, the fluidity is good, and the shrinkage is small, so it is suitable for castings with complex structures or thin-walled castings. In addition, because graphite is easy to form broken chips during cutting, the machinability of gray cast iron is better than that of steel.
The Important Role of Soil Bulk Densitometer in the Study of Soil Bulk Density
What is the soil bulk density? The dry weight of the soil in unit volume is the soil bulk density, which is also an important indicator of soil compaction. It is also called the soil pseudo-specific gravity. The ratio of the weight after drying in a volume of soil to the weight of water in the same volume. Soil bulk density meter is the main instrument for the determination of soil bulk density in modern times, and its measurement results are accurate and effective.