Aluminum alloy castings are widely used in railway, military, aerospace, automotive, medical and other fields because of their good comprehensive mechanical properties. Aluminum alloy castings have the characteristics of low density, high strength coefficient and hardness, and become one of the most suitable materials to realize light-weight structural thin-walled...
With the implementation of the “Three Guarantees” responsibility system in the international automobile industry, the quality requirements of automobile parts are becoming higher and higher. For the cylinder head of the key parts of the automobile engine, the product quality requirements are to keep improving, and the quality control...
Most of all kinds of porosity casting defects are located in the key parts of the cylinder block, and the size is generally large. Once they occur, the cylinder block blank will be directly scrapped. Therefore, such defects directly affect the scrap rate of the casting cylinder block. The...
Porosity casting defect has always been the most common defect in sand casting gray iron castings. It refers to the smooth holes of different sizes on the internal surface or near the surface of the casting, and the hole wall often has oxidation color. Due to the different gas...
There are many tests for statistical distribution, such as KS test, chi square test, etc. from the perspective of graphics, QQ chart or PP chart can also be used to check whether the data obey a certain distribution. As shown in Fig. 1 ~ Fig. 4, the P-P scatter...
Aiming at the wet mold clay sand casting process of railway steel castings, the research is carried out from the aspects of the formulation development of wet mold surface sand and back sand, the computer simulation and optimization of casting process scheme, the analysis and optimization of casting defects...
The coupler tongue produced by the final process scheme of early steel casting trial production has successfully passed the inspection and certification at all levels, but there are still casting defects such as cracks, pores and sand inclusion. Therefore, after the formal mass production, the process scheme has been...
The casting simulation of four branch cast steel joints is carried out by using ProCAST casting simulation software to explore the causes of defects. The casting process and parameters are selected according to the actual casting conditions to simulate the metal flow and solidification process in the process of...
In view of various casting defects in the trial production of railway steel castings, combined with the actual production conditions of the factory, the following solutions and precautions are put forward to serve the mass production of hook body and hook tongue. Hot crack: increase the fillet radius at...
As shown in the table, the frequency statistics of casting defect size can be obtained by summarizing the sizes of all casting defects. Casting defect size range Number of casting defects 0-5 261 5-10 41 10-15 11 15-20 6 20-25 2 25-30 2 30-35 2 35-40 0 40-45 1...