Different steel casting production processes determine different production processes, but they can be basically divided into process design, model making, molding and core making, lower core box, smelting and pouring, sand falling, gas cutting and gouging, heat treatment, grinding and cleaning, inspection and other processes. The shrinkage cavity and...
The steel castings were trial produced in two batches, and the first time was qualified, and the second time there was shrinkage cavity and porosity defect. After investigating the five aspects of personnel, machines, materials, methods and links, since there are no abnormal changes, it is inferred that the...
The shrinkage rates of several common iron carbon alloys are shown in the table. It can be seen from the table that the shrinkage rate of carbon steel is the largest in the table. Material Science Pouring temperature / ° C C Si Mn P S Mg Shrinkage rate...
The traditional process tooling design is carried out for the bracket steel castings of a certain construction machinery. According to the designed process drawing and tooling drawing, the enterprise carries out outsourcing mold manufacturing and product trial production. The results show that the product has shrinkage cavity and porosity...
The traditional steel casting process design is analyzed through examples, and the shortcomings of the traditional process design are analyzed through the actual defects. Then the improvement measures are put forward for the examples, and the application verification is carried out. The improved steel casting process design method is...
The shrinkage rate prediction module is used to predict the distribution of shrinkage defects. When the simulation results show that there are almost no shrinkage holes at the root of the main pipe and riser under the condition of 1% loose shrinkage, which are similar to the predicted process...
Distribution law of casting defects of multi branch cast steel joints: (1) Cracks mainly appear in the R zone of cast steel joints. The reason is that the thickness of the branch pipe is only half of that of the main pipe, resulting in different cooling conditions between the...
Fig. 1 the visual characteristics of air hole defects on the upper surface of steel casting hub are round, the inner wall is smooth and oxidized. There are many reasons for this product. This product is caused by the metal liquid flow in the gating system carrying bubbles into...
Shrinkage cavity and porosity are two common casting defects in large steel castings. They are mainly distributed in the last solidification part of the casting. They are caused by the lack of supplement of shrinkage of liquid metal during cooling and solidification. Shrinkage cavity and porosity casting defects not...
The judgment of multiple hot spots is to judge the number, size and position of hot spots that may be separated in the solidification process of castings according to the judgment basis, and then calculate the shrinkage and feeding on these basis. Multi hot spot judgment is what we...