答案
Dross and Inclusion in Liquid Modeling and Prevention
Abstract
The purpose of this paper is to investigate the impact of dross and inclusions on the performance of liquid modeling parts and the strategies that should be taken to prevent them from occurring. Liquid modeling is a technology used to create parts from liquid metals and alloys, which have a range of advantages over alternative casting techniques, due to their high level of precision. However, when liquid modeling is carried out, dross and inclusions can form on the surface of the part and lead to defects. Therefore, research was undertaken to investigate different techniques that can be used to reduce the occurrence of dross and inclusions and to enhance the characteristics and performance of liquid modeling parts.
Introduction
Liquid modeling is a technology used to create parts from liquid metals and alloys in more complex shapes and sizes than is possible with traditional casting techniques. Due to their high level of precision, liquid modeling parts have a range of advantages over traditional methods and have become increasingly popular for use in high-performance applications. Despite the high level of accuracy achievable with liquid modeling, dross and inclusions can form on the surface of the part due to various external factors, which can cause defects in the finished part and reduce its performance. Therefore, it is important for designers to be aware of potential sources of dross and inclusions and strategies that can be employed to reduce their occurrence and maintain the quality of the parts.
Sources of Dross and Inclusion
The main sources of dross and inclusions when liquid modeling are external factors such as poor mold design, poor metal properties and inadequate degassing methods. Poor mold Design Poor mold design can lead to major issues with dross and inclusions as the shape and material of the mold can affect the flow of material and cooling rate of the metal. If the cooling rate is too slow then the material is not given enough time to solidify, leading to the formation of dross and inclusions. Therefore, detailed attention must be payed to mold design in order to ensure that the cooling rate of the metal is optimal for the material used.
Metal Properties The properties of the metallic material used for the liquid model has a large effect on the occurrence of dross and inclusions. If the material used has a high sulfur content, then it will be more prone to dross formation. Therefore, it is important for designers to select metallic materials that have low sulfur content to reduce the occurrence of dross and inclusions.
Inadequate Degassing
Inadequate degassing of the metallic material prior to the liquid modeling process can lead to the formation of dross and inclusions. Degassing the metallic material can reduce the dissolved gas content which can reduce the formation of dross and inclusions. Therefore, adequate degassing is an important step in the liquid modeling process and must be carried out in order to maintain the appearance and performance of the part.
Techniques To Prevent Dross and Inclusion
Mold Design One of the most effective techniques to reduce dross and inclusions during liquid modeling is to ensure that the mold design is correct and optimized for the manufacturing process. By paying attention to the shape and material of the mold and ensuring that the cooling rate meets the requirements of the metallic material, it is possible to reduce the occurrence of dross and inclusions.
Using Quality Metals Using quality metals from reputable suppliers has been found to significantly reduce the occurrence of dross and inclusions. This is due to the fact that high-quality metals are more resistant to oxidation and therefore less prone to dross formation.
Adequate Degassing As discussed previously, adequate degassing is an important step in reducing dross and inclusion formation during liquid modeling. Therefore, it is important to ensure that the metallic material has been properly degassed prior to the modeling process in order to reduce the number of gas bubbles in the material.
Robust protective cover A robust protective cover can be used to protect the metal from oxidation and other external factors that can lead to the formation of dross and inclusions. Furthermore, the protective cover can also reduce the cooling rate of the metal, which is beneficial as a slower cooling rate has been found to reduce dross formation.
Conclusion
In conclusion, it is essential that designers take the necessary steps to reduce the occurrence of dross and inclusions during the liquid modeling process. The main sources of dross and inclusions are poor mold design, poor metal properties and inadequate degassing methods. Therefore, it is important to ensure that the mold design is correct for the process, that high-quality metals are used and that adequate degassing is carried out to reduce the chance of defects occurring. Furthermore, a robust protective cover can also be used to reduce the cooling rate and protect the metal from oxidation.
