News

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 gina@guokuncasting.com or gina.guokun@gmail.com 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 gina@guokuncasting.com or gina.guokun@gmail.com 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 gina@guokuncasting.com or gina.guokun@gmail.com or call us 86-18132789710.

The factors affecting the quality of cast iron parts

Reasonable Design of cast iron parts When designing the cast iron components, the geometry and size of iron casting parts shoud be determined by the working conditions and the metal’s properties. And the disgner should consider cast iron and casting method when drawing the cast iron parts to avoid or reduce the casting occurrence of casting defects, such as sergregation, deformation, crackings, etc. Suitable casting method Our engineers will pick out the most suitable casting method when producing iron casting parts. The structure, weight and size of cast iron parts, cast iron characteristics, the appropriate parting surface and shape, core making method, reasonable setting of casting ribs, cold iron, riser and other casting system will affect the quality of cast iron components. Baoding Guokun can offer you the sand casting, green sand casting, shell molding casting, resin sand casting method for all cast iron parts. If you have similar inquiry, please feel free to contact gina@guokuncasting.com. The quality of raw material The quality of metal charge, refractory, fuel, flux, modifier and foundry sand, sand binder, paint and other substandard materials will affect the casting quality. They will cause casting defects, such as pores, pinholes, slag inclusions and sand sticking in cast iron components. These bad appearance quality and internal quality, when severe, will scrap iron castings. Manufacturing operation Baoding Guokun will design the reasonable operation procedures, improve the technical level of our workers to make the procedures implemented correctly. Quallity Control Firstly, we must formulate the technical rules and technical conditions for the control and inspection of raw materials. Then, each process should be strictly controlled and tested according to the right technical conditions. Finally, the quality of the finished castings should be checked. We have equiped with professional QC worker and testing equipment, such as the spectrograph, Magnetic tester, CMM, Universal tester, Impact testing machine, hardness tester, etc If you need iron sand casting parts or steel investment casting components, please contact Baoding Guokun via gina@guokuncasting.com or call us 86-18132789710.

Why use cast iron to produce lathe parts?

Cast Iron material is competitive than cast steel. Cast iron is with exceptional damping capacity. Cast iron, specific grey cast iron is used for custom lathe components because of having exptional damping capacity-reative ability of a material to absord vibration. The damping capacity can help the cast iron lathe bed, lathe support or base stable to assure the lathe machining dimensional accuracy. 3.Cast iron is commonly used for machinery housings or bases due to the stable structure of the material. It is also known for holding its shape when it is subjected to contraction and expansion due to temperature fluctuations. 4.Cast iron consists of Graphite flakes that have sharp edges which act as stress raisers in tension. This shape makes cast iron low in tensile strength and ductility, but it still has high compressive strength. 5. The morphology of graphite as a flake in grey cast iron enables to absorb both compressive and vibrational loads without initiating a crack. In general, vibration can be critical in machinery and can cause an unsatisfactory operation or even failure. Baoding Guokun casting factory have complete quality inspection equipments for dimension testing, mechanical properties and chemical analysis. ISO 9001 certification can help us to issue all quality reports for all inspection. The testing machinery we have is spectrometer, hardness tester, metallographic inspection, tensile strength testing, ultrasonic testing, CMM. If you need Lathe part casting, iron casting lathe parts, lathe machinery components, CNC Lathe casting, metal casting lathe parts, sand casting lathe parts, lathe parts China factory, Lathe components China company, please mail your inquiry to gina@guokuncasting.com or gina.guokun@gmail.com or call us 86-18132789710.