Zinc alloy die casting have a good surface roughness, strength and elongation, Which are widely used in a variety of ornaments, such as furniture, accessories, door handle,architectural decoration, bathroom accessories, lighting parts, toys, tie clips, belt buckles, various metal buckle and so on,they are required a good surface treatment performance. The traditional zinc alloy die-casting material are Zamak 2,3,5,7 , the Zamk 3 is the most widely used in different industries Zinc Casting, Zinc Alloy Die Castings, Zinc Pressure Die Casting, Zinc Die Casting Products Ningbo Zhenhai Xinxie Machinery Co.LTD , https://www.xinxie-diecasting.com
In the past, monitoring of soil moisture mainly depended on manpower, and there were few monitoring points and poor representation, which could not meet the actual needs of production. Therefore, in recent years, many relevant units at home and abroad have studied the use of satellite remote sensing methods to develop soil moisture and drought management systems and achieved good results. In general, the greater the soil moisture content, the larger the soil heat capacity, the greater the change in the soil heat inertia to a certain extent reflect the change in heat capacity. Therefore, the size of the soil heat inertia can reflect the status of soil moisture content, and the soil thermal inertia It is related to the change of the ground temperature.
Bare land in the same area does not consider the influence of other factors. The pixel points of the same soil moisture. The difference in surface temperature should also be the same. However, the surface temperature difference measured by the soil moisture content and the drought management system is different. Apart from other factors, its geographical location is an important factor. In general, the temperature difference between the surface and the inland gradually increases. Therefore, in the peninsula area, the relationship between soil moisture and surface temperature difference is not obvious.
In general, the temperature difference in the eastern coastal areas is much smaller than that in the western region under the same relative soil moisture conditions. If the whole province is considered as a region, the accuracy of the established soil moisture and ΔT model is not high. Therefore, before establishing the relationship between soil moisture and temperature difference, the surface temperature difference data obtained by the soil moisture and drought management system must be corrected in order to improve the accuracy of the model.
Zamak 3: good fluidity and mechanical properties. Used in casting of low mechanical strength, such as toys, lamps, decorations, some electrical parts.
Zamak 5: good mobility and good mechanical properties. Applied to certain requirements of the mechanical strength of castings, such as auto parts, electrical and mechanical parts, mechanical parts, electrical components.
Zamak 2: there are special requirements for mechanical properties, hardness, wear resistance, dimensional accuracy requirements of the mechanical parts
.ZA8: good flowability and dimensional stability, but less liquid. Used in die casting, small size, accuracy and mechanical strength demanding workpieces, such as electrical appliances. Superloy: the best mobility, applied to the die-casting thin-walled, large-size, high precision, complex shape of the workpiece, such as electrical components of the box.
Different zinc alloys have different physical and mechanical properties, such as die casting design provides room for choice. The same time, the choice of the zinc alloy is more important to select what kind of zinc alloy, mainly from three aspects to consider
1. Die-casting their own purposes, need to meet the performance requirements. (1) mechanical properties, tensile strength, when the material fracture resistance; Elongation, brittleness and plasticity of the measure;Hardness is the resistance of the material surface is pressed into a hard object or friction caused by plastic deformation. (2) state of the working environment: temperature, humidity, media contact with the workpiece and air tightness requirements. (3) precision: accuracy and dimensional stability can be achieved.
2. process performance: (1) casting process; (2) mechanical processes; (3) surface treatment.
3. Economic good: the cost of raw materials and production equipment requirements (including smelting equipment, die casting machine, mold, etc.), as well as production costs.
Soil moisture is one of the key factors affecting the growth and development of crops and the formation of yield. It is important to understand and understand the status of soil moisture everywhere, and it is of great significance for the relevant departments to properly direct agricultural production, fight drought, and harvest grain. The use of polar-orbiting meteorological satellite remote sensing data to monitor soil moisture meteorological satellites has the advantages of a wide field of view, rapidity, macroscopicity, economy, and energy harvesting. The sub-satellite points have a resolution of 1.1 km and can meet the needs of soil moisture monitoring. A relatively complete soil moisture and drought management system has been established to meet production needs.