{"id":1419,"date":"2017-12-19T10:09:07","date_gmt":"2017-12-19T10:09:07","guid":{"rendered":"http:\/\/www.steelforging.org\/?p=1419"},"modified":"2021-03-25T02:56:49","modified_gmt":"2021-03-25T02:56:49","slug":"hot-forging","status":"publish","type":"post","link":"https:\/\/www.steelforging.org\/?p=1419","title":{"rendered":"Hot Forging"},"content":{"rendered":"

It is essential to note that the forging manufacturing process is completely different from the casting one (see difference between forging and casting<\/a>), where the molten material is poured into a\u00a0mold. Another significant difference to the other manufacturing methods as casting and machining is that forging improves the mechanical properties of the material by refining its grain structure\u00a0and making it tougher and stronger. In terms of temperature, forging can be divided in hot foging and cold forging. Among them, hot forging is the most widely used process for forged steel parts.\u00a0So people may ask what is hot forging? what are the differences between hot forging and cold forging?<\/p>\n

\"hot<\/a><\/p>\n

Hot forging is the forging<\/a> process that metals are plastically deformed above their recrystallization temperature, which allows the material to retain its deformed shape as it cools.<\/p>\n

Like its name “hot forging”, the hot forging process is performed at very high temperature (up to 1150 \u00b0C for steel). This temperature is necessary in order to avoid strain hardening of the metal\u00a0during deformation.<\/p>\n

This process usually involves heating the steel billets (to the above its recrystallization point) after which it is pressed under dies \u2013 depending on the requirements, this die would be heat treated so that the hardness can withstand the violent hitting. Because the billet is hot, it \u2018moves around\u2019 easily and allows steel forging manufacturers to create more elaborate shapes than with cold forging.<\/p>\n

After the hot forging process ends, parts must be cooled rapidly to \u201cset\u201d the metal in its new shape. Care must be taken in the cooling process, however, too fast cooling of hot forged parts can\u00a0result in warping. Usually we just place the hot forged products cooling under room temperature.<\/p>\n

The hot forging process produces very little material scrap, making it one of the most efficient metal forming methods.<\/p>\n

Flash is always existed during hot die forging process. And it is necessary to produce complex 3D geometries with very different local cross-sections and secondary design elements. The flash\u00a0acts as a brake on the material flow and slows the flow of excess material. Thus, high internal pressure is built up in the die, which forces the remaining material into the die cavities.<\/p>\n

Hot die forgings are usually manufactured in multiple steps for complex shapes, and multi-pairs of forgings dies are required to form final shapes. Besides, machining might be operated after\u00a0forging, if hot die forging process can not meet the dimensions and tolerances.<\/p>\n

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The Benefits of Hot Forging<\/h2>\n

Hot forging is selected when large amounts of plastic deformation are needed to form the part. Lots of advantages of hot forging can be seen:<\/p>\n