The Difference between cast aluminum alloy and die casting aluminum alloy.

Cast aluminum alloys are mostly the 300-series(Al-Si-Cu or Al-Si-Mg) alloys, such as 319, A383, A380, A360, 356, A356. But how to choose the most suitable aluminum alloys when producing aluminum alloy parts? Cast aluminum alloys mains the aluminum alloy casting components which produced by sand casting, gravity casting and other casting methods, such as A356, ZL101, ZL104, ZL102, etc Die Casting aluminum alloys mains the aluminum casted parts which manufactured by high pressure die casting process, such asA360, A380, A383, A518, ADC10, ADC12, etc Die casting is a metal casting process that is characterized by forcing molten metal under high pressure into a mold cavity. In China, you will find ZL can represent the cast aluminum alloy grade, YL means the die cast aluminum grade. By the way, the cast aluminum castings can be heat-treated, generally T6 heat treatment. But die casting parts are not suitable for T6 heat treatment because the temperature of T6 heat treatment is very high, lower than the melting point of aluminum alloy 15-20 degress, the gas in the die casting parts will expand ad be forced out of the casting surfaces, which will cause casting defects. So if you need aluminum alloy casting parts, aluminum die casting components, please feel free to contact Baoding Guokun via or or call us 86-18132789710.

How to reduce the shrinkage of steel casting components?

When making steel casting components, we will find some shrinkage, which will cause high defect rate. So how to reduce or avoid the shrinkage when lost wax casting process? Firstly, we should ensure the uniform wall thickness, usually not less than 8mm. Secondly, we should design the pouring temperature to around 1580°C. The temperature is higher, the molten steel’s fluidity is more better. But if too high, it also can cause other casting defects. By the way, the quartz sand is the best casting material under high temperature conditions. Lastly, Baoding Guokun use the suitable design of riser, cold iron, iron supplement to ensure the solidification to prevent casting defects, such as shrinkages. If you need casting components, steel casting parts, steel investment casting, please contact or or call us 86-18132789710.

The reasons and solutions of casting cracks.

When manufacturing steel casting components, so many casting defects will be occured if having incorrect or improperly casting operation, such as casting cracks. With more than 15 years of casting experiences, we made a summary of the reasons and remedies of casting cracks. The cause of cracks in steel castings are: The surface defects and internal defects will cause some cracks; The cooling rate is too fast during the cooling process; The stress relief was not performed in time after cooling the casting components; The cross section of castings changes too suddenly The transition’s corners are too small. How to prevent the cracks when casting? We need to improve the casting’s structure when designing; Improving the melting quality of casting alloy steel; Adopting the correct casting method and heat treatment process. Simultaneous solidification of castings not only helps prevent hot cracking, but also helps prevent cold cracking. Reasonably setting the position and size of pouring riser so that the cooling speed of each casting part is as uniform as possible to reduce the cold cracking; In short, when producing steel castings, we must be careful and meticulous in order to get a perfect finished products. If you need steel casting, please contact Baoding Guokun via or or call us 86-18132789710.

The blow holes in the precision casting components

When machining the precision investment casting components, the blow holes are easily found in the custom casting parts. So the casting parts with blow holes have to be scrapped. This will increase the casting prices and machining cost. With the assistance of more than 15 years of casting experience, our workers found the reasons to cause the blow holes as follows: 1.In most cases, the blow holes are mainly caused by the lack of sufficient roasting of the precision casting shell. When the molten steel is poured, a large amount of gas cannot be discharged smoothly, and then invades the molten metal to form bubbles. 2.Due to the shelling process or the shell material, the gas permeability of the shell is too poor, the gas in the cavity is difficult to discharge, and the blow holes are formed in the molten metal. 3.During pouring, the air in the molten steel can not discharged to form casting blow holes. How to avoid the investment casting blow holes? 1.When lost-wax investment casting process, it is better to design the highest point of the complex casting parts to arrange the air to discharge. 2.When designing the gating system, it is necassary to think more about the shell exhaust requirements. 3.The calcination temperature and time of the shell should be reasonable, and the holding time should be sufficient. 4.The wax should be thoroughly removed when dewaxing. 5.Properly reduce the spacing between the pouring spout and the sprue cup, and the pouring speed should be averaged to ensure that the steel level is filled with the cavity and the air is soaked into the molten steel as little as possible, so that the gas in the cavity and the molten steel can be smoothly discharged. So if you need high quality investment casting components, steel casting parts, water glass casting process, silca sol casting method, sand casting, please feel free to contact or or call us 86-18132789710.

Advantages and disadvantages of casting process

Casting is a manufacturing process in which a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. The solidified part is also known as a casting, which is ejected or broken out of the mold to complete the process. As a molding process, the basic advantage of casting is that the liquid metal has a small shear stress and be easy to shape. Advantages of casting process1. Wide range of low-prices raw materials, such as scrap, scraped components, chips, etc. 2.The casting method has obvious advantages of low production costs, compared with other forming processes. 3.Casting is a producing techquie which poured liquid metal to the required mold. So casting processes can produce very complex shapes, especially the various custom metal components with somplex internal cavities. 4.Casting processes are not limited in size, weight and production volume, and casn produce a variety of metals or alloys. So casting process is more flexible. 5.Widely used. 40%-70% in agricultural machinery and 70%-80% in lathe are casting components. Disadvantage of casting method 1.If using same material, the mechanical properties of casting components are not as good as the forging parts. 2.The quality of metal castings is not stable because of too many production process. And the influencing factors are complex. So the casting process is difficult to control. 3.The casting products easily have various defects and deficiencies, such as pores, shrinkages, pinholes, inclusions, blisters and cracks inside the casting components. 4.The casting dimensional accuracy is low, compared with machining components. 5.The working conditions of foundry production are poor. In China, the young people will refuse to work in the poor casting factories. Baoding Guokun can produce and export various casting components by using sand casting, resin sand casting, green sand casting, shell molding casting, investment casting, lost wax casting, water glass casting, silica sol casting, die casting, gravity casting, centrifugal casting and lost foam casting process. If you have similar need, please feel free to contact or or call us 86-18132789710.