Abstract
The hollow sand mold can affect the cooling of the casting during the solidification process. A chimney structure of a hollow sand mold that mainly consists of a two-layer shell with through channels was proposed. The design method was proposed for the chimney structure. Due to the chimney effect, cool air can enter the chimney from the bottom entrance, and hot air flows out from its top opening. Air transfers heat from the sand mold and forms a temperature gradient from bottom to top. A hollow sand mold with a chimney structure was applied to the wedge plate casting. During the solidification process, natural cooling and forced air cooling through open channels were applied. The effects of the chimney on the microstructure, mechanical properties, and residual stress of the castings under these two different cooling conditions were analyzed and compared with those of the casting in a dense mold. During the solidification stage of the castings, the chimney structure prolonged their solidification time. After solidification, the chimney structure under forced air condition increased the cooling rate of the castings by 61% and the temperature gradient along the vertical direction by a factor of three. The Si content in the Al matrix increased by 20.4%, and the tensile strength increased by 32.66%.
Highlights
In the casting process, the solidification of liquid metals determines the microstructure and mechanical properties of the casting products
There is the use of risers, internal and external cold iron, etc., the second is to optimize the sand mold structure, the third is forced cooling by means of blowing air, water cooling, etc
Deng [1] proposed the internal hollow structure to control the cooling of the casting, and the solidification time of the riser surrounded by three layers of cavities was extended by more than 30%, which significantly improved its feeding capability during solidification
Summary
The solidification of liquid metals determines the microstructure and mechanical properties of the casting products. Deng [1] proposed the internal hollow structure to control the cooling of the casting, and the solidification time of the riser surrounded by three layers of cavities was extended by more than 30%, which significantly improved its feeding capability during solidification. Towoju et al [2] analyzed the effect of cooling channels in sand mold on the properties of cast iron by numerical simulation. Grassi et al [3–5] proposed the ablation casting process in which water is sprayed onto the sand mold to erode away the sand mold and to cool the casting directly with water. Stets [6] used water spray cooling for the sand mold to control the cooling during the solidification process and studied the effects of the amount of water, the time span, and the sand–iron ratio on the cooling rate. Three-dimensional (3D) printing technology has brought new ideas and applications
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
