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Casting Classification And Use Of Castings
May 19, 2017

Casting Castings are classified and used in the form of castings are made of various casting methods of metal forming objects, that is, smelting good liquid metal, with casting, injection, suction or other casting method into the prepared mold, after cooling After grinding and other follow-up processing means, the resulting shape, size and performance of the object

Casting applications have a long history. Ancient people with castings and some living utensils. In modern times, castings are mainly used as blanks for machine parts, some precision castings, and can be used directly as part of a machine. Casting in the mechanical products occupy a large proportion, such as tractors, the casting weight of about 50 ~ 70% of the weight of machinery, agricultural machinery accounted for 40 ~ 70%, machine tools, internal combustion engines in 70 ~ 90%. All kinds of castings, the largest use of mechanical casting varieties, the most complex shape, the largest amount, accounting for about 60% of the total output of castings. Followed by metallurgical ingot molds and engineering pipes, as well as some of the tools in life.

Casting is also closely related to daily life. For example, often use the door handle, door locks, radiators, water pipes, wok, gas stove, iron, etc., are cast.

Casting Casting has a variety of classification methods: according to their different use of metal materials, divided into cast steel, cast iron, cast copper pieces, cast aluminum, cast pieces of magnesium, cast zinc, cast titanium and so on. And each type of casting can be further divided into different types according to their chemical composition or metallographic organization. Such as cast iron can be divided into gray cast iron, ductile iron, vermicular graphite cast iron, malleable cast iron, alloy cast iron, etc .; according to the different molding methods, casting can be divided into ordinary sand casting, metal casting, , Centrifugal castings, continuous castings, investment casting, ceramic castings, electroslag remelting castings, bimetallic castings and so on. Which is the largest application of ordinary sand casting, accounting for about 80% of all castings. The aluminum, magnesium, zinc and other non-ferrous metal castings, mostly die castings

Casting Casting forming the theory of metal liquid molding is often called casting, casting forming technology has a long history. As early as 5000 years ago, our ancestors will be able to cast red copper and bronze products. Casting is the most widely used metal liquid forming process. It is the liquid metal poured into the mold cavity, to be cooled after solidification, access to a certain shape of the blank or parts of the method.

In the machine equipment, the proportion of liquid molding is very large, in the machine, internal combustion engine, mining machinery, heavy machinery in the liquid forming parts of the total weight of 70% to 90%; in the car, tractors accounted for 50% to 70%; Agricultural machinery accounted for 40% to 70%. Liquid forming process can be so widely used because it has the following advantages:

(1) can create a cavity, the shape is very complex blank. Such as a variety of boxes, machine bed, cylinder block, cylinder head and so on.

(2) process flexibility, wide adaptability. The size of the liquid molding is almost unlimited, its weight can be from a few grams to several hundred tons, the wall thickness can be from 0.5mm to 1m or so. Industrial can be dissolved into liquid metal materials can be used for liquid molding. For poorly castable cast iron, liquid molding is the only way to produce its blanks or parts.

(3) the cost of liquid molding is low. Liquid molding can be directly used waste parts and chips, equipment, low cost. At the same time, liquid forming parts processing margin is small, saving metal.

However, the metal liquid forming process and more difficult to precisely control, making the casting quality is not stable enough. Compared with the same material forging, due to liquid forming tissue loose, grain thick, internal

Easy to produce shrinkage, shrinkage, pores and other defects. Its mechanical properties are low. In addition, labor intensity, poor conditions. Has excellent mechanical and physical properties, it can have a variety of different strength, hardness, toughness with the comprehensive performance, but also both one or more special properties, such as wear, high temperature and low temperature, corrosion resistance.

Casting Casting the weight and size range is very wide, the only light weight of only a few grams, the most important can reach 400 tons, the wall thickness of the thinnest only 0.5 mm, the thickest can be more than 1 meter, the length can be a few millimeters to ten meters, To meet the requirements of different industrial sectors.