The casting production line covers an area of ??20,000 square meters, with more than 100 sets of casting equipment, heat treatment equipment, online detection and chemical analysis equipment, and an annual production capacity of 7,000. It is the largest mining machinery casting production base in the region. The main products are: various carbon steel, alloy steel, heat-resistant wear-resistant and corrosion-resistant steel, high manganese steel, wear-resistant heat-resistant cast iron, etc. , Cement and other complete equipment.
There are multiple classification methods for castings:
According to the different metal materials used, it is divided into steel castings, cast irons, copper castings, aluminum castings, magnesium castings, zinc castings, titanium castings, etc. Each type of casting can be further divided into different types according to its chemical composition or metallographic structure. For example, iron castings can be divided into gray iron castings, ductile iron castings, vermicular graphite iron castings, malleable iron castings, alloy iron castings, etc.; according to the different molding methods, the castings can be divided into ordinary sand castings, metal castings, die castings , Centrifugal castings, continuous castings, investment castings, ceramic castings, electroslag remelting castings, bimetallic castings, etc. Among them, ordinary sand castings are the most used, accounting for about 80% of the total casting output. Non-ferrous metal castings such as aluminum, magnesium, and zinc are mostly die castings.
The theoretical metal liquid forming of castings is often called casting, and casting forming technology has a long history. As early as more than 5000 years ago, our ancestors were able to cast red copper and bronze products. Casting is the most widely used metal liquid forming process. It is a method of pouring liquid metal into a mold cavity, and after it is cooled and solidified, a blank or part of a certain shape is obtained.
Liquid moldings account for a large proportion in machinery and equipment. Liquid moldings account for 70% to 90% of the total weight in machine tools, internal combustion engines, mining machinery and heavy machinery; 50% to 70% in automobiles and tractors; 40% to 70% of agricultural machinery. The liquid molding process can be so widely used because it has the following advantages:
(1) It can produce blanks with complex inner cavity and complicated appearance. Such as various boxes, machine bed, cylinder block, cylinder head, etc.
(2) Great process flexibility and wide adaptability. The size of the liquid molding is almost unlimited, its weight can be from a few grams to hundreds of tons, and its wall thickness can be from 0.5mm to 1m. In the industry, any metal material that can be dissolved into a liquid can be used for liquid molding. For cast iron with poor plasticity, liquid forming is the method of producing its blanks or parts.
(3) The cost of liquid molded parts is low. Liquid molding can directly use waste machine parts and chips, and the equipment cost is low. At the same time, the processing margin of liquid molded parts is small, saving metals.
However, there are many processes for liquid metal forming, and it is difficult to control precisely, which makes the quality of castings not stable enough. Compared with forgings of the same material, due to loose liquid forming structure and coarse grains, defects such as shrinkage holes, shrinkage holes and porosity are prone to occur inside. Its mechanical properties are low. In addition, the labor intensity is high and the conditions are poor. It has excellent mechanical and physical properties. It can have various comprehensive properties of strength, hardness and toughness. It can also have one or more special properties, such as wear resistance, high temperature and low temperature resistance, and corrosion resistance.
The castings have a wide range of weights and sizes. The lightest weight is only a few grams, the heaviest can reach 400 tons, the thinnest wall is only 0.5 mm, the thickest can be more than 1 meter, and the length can be from a few millimeters to more than ten meters. Can meet the requirements of different industrial sectors.
The purpose of casting:
The use of castings is very extensive, has been applied to the hardware and the entire mechanical and electronic industry, and its use is becoming a trend of continuous expansion. Specifically used in construction, hardware, equipment, engineering machinery and other large machinery, machine tools, ships, aerospace, automobiles, locomotives, electronics, computers, electrical appliances, lamps and other industries, many are ordinary people all day contact, but do not understand Metal objects.