Regarding gravity casting, through the previous study, we can know that it is a process of casting by gravity, referred to as gravity casting, or gravity casting, and the finished product we obtained is called casting. Then, for the study of gravity casting, the following will continue through two aspects.
1. Some requirements of gravity casting in cooling
Why gravity casting requires cooling, this is because the temperature of the mold during the gravity casting process requires this result. Its cooling includes both natural cooling and forced cooling, which can be selected according to different situations and requirements.
There are two ways of forced cooling in gravity casting cooling: compressed air cooling and water cooling. If compressed air is used for cooling, the air should be blown evenly on the surface of the mold, and there should be no omissions, otherwise it will affect the service life of the mold, or cause problems such as cracks and deformation.
2. Reasons for the formation of looseness in gravity casting
If the castings obtained by gravity casting have looseness, the reasons are as follows:
Reason one: The casting shrinks during the casting process, but the metal liquid is not replenished in time.
Cause two: The mold cross-section size or the position of the runner is incorrect, which causes problems such as local overheating.
Cause three: In terms of temperature, it cannot meet the requirements specified in the casting solidification sequence.
Cause four: In the process of using the coating, the coating type and its thickness were not carried out in accordance with the prescribed requirements, so that the casting had a problem of looseness.
Through the above two aspects, we can understand the specific requirements of gravity casting for cooling, and why the castings have loose problems, so we can check them one by one to find out the specific reasons, so that we can deal with them in a targeted manner. Some effective measures can be taken to avoid the recurrence of this problem and reduce the probability of gravity casting problems.
