As a key basic component with a large quantity and a wide range, large-scale forgings are the basis for the development of the equipment manufacturing industry, and determine the performance, level, quality and reliability of major equipment and host products. The key to high-quality development.
In the traditional large-scale forging manufacturing process, large-scale steel ingots are prepared first, then forged into the desired shape, and the internal structure and properties are changed through heat treatment. The manufacture of large-scale forgings starting from the preparation of steel ingots and ending with performance heat treatment runs through the whole process of thermal processing. Ingots are called the "baby" of forgings and are the key to determining the quality of forgings. However, in traditional steel ingots, there will be segregation and inclusions. And harmful equal defects, and the larger the ingot, the more serious the defects.
Although the defects in the steel ingot can be improved to a certain extent in the subsequent forging and heat treatment stages, not only the price paid is too high, but also some defects cannot be completely eliminated. Defects that are eventually retained in large forgings often lead to the scrapping of large forgings. Practice has proved that the most serious carbon segregation is the roll and single-ladle casting nuclear power head; the exposed inclusions are mainly reflected in the nozzle end where the die-casting steel ingot solidifies first; the harmful phase is mainly reflected in the large-section stainless steel and high-temperature alloy materials; the material utilization rate The low value is mainly reflected in the large amount of removal of die-casting steel ingot nozzles and risers, and the difficulty in achieving near-net shape for heavy and complex forgings. These worldwide problems require transformative technologies to be solved, thus calling for the birth of original technologies.
Today, I would like to introduce this book "Additive Billet Manufacturing of Large Forgings", which is one of the "Original Technology Origins of Key Basic Parts" series of books. " and "Super Large Multifunctional Hydraulic Press", the relationship between the three is similar to the ingredients, cooking skills and kitchen utensils for making delicious food. Additive billet making is the "organic food material" for preparing large forgings with "both form and spirit". FGS forging is the "exquisite cooking" for making key basic parts. The super large multi-functional hydraulic press is the realization of additive billet making and FGS forging "Perfect Kitchenware".
"Additive billet making of large forgings" is a summary and refinement of the theory and practice of additive billet making, including a lot of precious materials such as liquid-solid composite billet anatomy test of roll materials, alloy steel and stainless steel solid-solid composite billet dissection test, etc. It is hoped that it can become a technical work guide for large-scale forging practitioners.
