Ductile iron is an important material in strong and tough cast iron. Its strength, plasticity and toughness are higher than other cast iron, and it has good vibration absorption and wear resistance. Based on the above characteristics of materials, ductile iron is widely used in construction machinery, energy machinery,...
With the continuous improvement of the requirements of aluminum piston manufacturers for increasing production and reducing consumption, aluminum piston manufacturers generally adopt the the first mock examination double cavity casting technology, and put forward higher requirements for the quality of aluminum piston the first mock examination double cavity casting....
Figure 1 shows the flange bonnet casting with blocked feeding channel. There are shrinkage defects at A and B of the casting, and a large number of shrinkage defects at C after processing; Figure 2 shows the improved process plan. Aluminum silicate is used for thermal insulation at position...
1. Analysis of cavity layout process The ductile iron casting process (see Figure) is divided from one end. All the ductile iron castings are in the lower box. There are 8 castings in one box. The left and right rows are arranged in a strip pattern. There are 4...
Figure 1 shows the location of shrinkage porosity in a casting. See Figure 2 for the process plan before improvement. After pouring, overheating occurred at positions 1, 2 and 3 in Figure 1, and the casting shrinkage defects were serious. See Figure 3 for the improved process plan. The...
At present, the nut of testing machine produced by our company is easy to produce shrinkage cavity and porosity defects, and the reject rate is more than 60%, but the yield is low. Based on this situation, process improvement is required. The screw nut belongs to medium wall thickness...
The sand casting surface obtained from the test is complete, but shrinkage cavities are found at the bearing holes of the box sand casting after machining, which are distributed circularly. The upper part of the pouring position is larger than the lower part. See Figure 1 for the specific...
According to the casting structure and sand casting process, the metal mold for the box and cover is designed. The mold of the box mainly includes left mold block, right mold block, push plate, ejector pin, upper mold core pulling block and other mold parts, which are vertically divided,...
A. Cost problem: Although the as-cast high-performance ductile iron has less heat treatment than ADI castings, and has certain economic advantages, the price of raw and auxiliary materials and alloys for casting is rising, and the high-performance ductile iron has strict control requirements on the quality of raw and...
In mechanical products with relatively small load but light weight requirements, aluminum alloy gearbox is a good choice. The problems of poor internal and external quality and high cost of casting aluminum gear box are easy to occur when sand casting is used for production; The aluminum alloy gearbox...