Nodular casting,grey iron casting,casting molding theory
Author: Date: 2015-10-9 8:53:06
Casting molding: the theory of liquid metal forming is often referred to as casting,casting forming technology has a long history. As early as 5000 years ago,our ancestors could cast copper and bronze products. Casting is the most widely used of the liquid metal forming process. It is the liquid metal pouring into the mould cavity,after the cooling and solidification,the shape of a certain method of blank casting or parts. In machinery and equipment in the proportion of liquid casting forming parts is very big,in the machine tool,internal combustion engines,mining machinery,heavy machinery in the liquid are deduced by 70% ~ 90% of total weight; In the car,tractor accounted for 50% ~ 70%; In the agricultural machinery accounted for 40% ~ 70%. Liquid molding process can be so widely used,because it has the following advantages: can produce the blank casting,appearance is very complicated in its inner cavity. Such as all kinds of box casting,casting machine,cylinder,cylinder head casting castings,etc.; Casting process flexibility,wide adaptability. Liquid forming casting of almost any size,the weight can be made of a few grams to hundreds of tons,the wall thickness is from 0.5 mm to 1 m or so. Industry that can melt into the liquid metal materials can be used for liquid. For the cast iron of plastic is very poor,liquid forming is the production of the blank or parts of the only way. (3) liquid are deduced with lower cost. Liquid forming can be directly used to scrap parts and chip,lower equipment cost. At the same time,liquid forming small casting machining allowance,saving metal. But the liquid metal forming process,and it is difficult to precisely control,make the casting quality is not stable. Compared with the same material of the color piece,because liquid forming loose organization,coarse grains,internal easy generation,shrinkage,porosity and shrinkage defect. The lower mechanical properties. In addition,the intensity of labor is big,poor conditions. Castings have excellent mechanical and physical properties,it can have different kinds of strength,hardness,toughness with the comprehensive performance,but also with one or more special properties,such as wear resistance,high temperature and low temperature resistance,corrosion resistance,etc. Casting weight and size range is very wide,the lightest weight of only a few grams,the heaviest can reach 400 tons,the most thin wall thickness is 0.5 mm,the thickness can be more than 1 m,the length can be made of a few mm to ten meters,can meet the requirements of the use of different industrial sectors.
use
Casting has a very wide range of USES,has been applied to the hardware and the whole mechanical and electronic industry and so on,and its purpose is to growing trend. Specific use,architecture,hardware,equipment,engineering machinery and other large machinery,machine tools,ships,aerospace,automobile,motorcycle,electronics,computers,appliances,lamps and lanterns,etc,many are all ordinary people all day long contact,but I don't understand the metal objects.