The main forging methods for large forgings are:
The process of using impact force or pressure to deform metal between the contact iron or forging die, in order to obtain the desired shape and size of the forging, is called forging. Forging is one of the important forming methods for metal parts, which can ensure that the metal parts have good mechanical properties to meet the requirements of use.
The forging method is characterized in that it includes forging and punching holes, inserting wax strips, molding and heating processes. The forging and punching process is to pull solid rods into seamless hollow pipe fittings; The process of inserting wax strips involves inserting wax strips corresponding to the inner diameter of the hollow pipe into the interior of the hollow pipe; The compression molding process involves placing a hollow pipe with wax strips between an upper mold and a lower mold. The mold cavities of the upper and lower molds are respectively designed with corresponding concave and convex shapes. After the upper and lower molds are pressed together, reinforcing ribs can be formed around the circumference of the pipe; The heat treatment process involves molding through compression molding.
Forging process for large forgings:
Large aluminum forgings usually refer to forging steel ingots weighing more than 10 tons into various heavy-duty machinery using a hydraulic press with a force of over 1000 kN or a forging hammer with a force of over 50 kN. Such as impellers, rotors, retaining rings, high-pressure vessels, large crankshafts, rolling mill rolls, etc. of power station equipment. These forgings are key components of heavy machinery, requiring high mechanical performance and reliable quality. But the production batch is generally not large, and the appearance is not too complicated. Therefore, in the production process of large forgings, ensuring the quality of forgings often becomes the primary issue in formulating processes.
Steel ingots are used as raw materials for large forgings. The larger the weight and size of the steel ingot, the more severe the internal structural defects. To ensure the quality of forgings, the forging process should strive to fully eliminate these defects during the processing, and then forge them into forgings that meet the requirements of shape, size, and performance. So the forging process of large forgings has a dual function of open forging and forming forging.
According to the regulations of China's heavy machinery industry, any free forgings that require a forging hydraulic press with a capacity of over 1000 tons can be referred to as large forgings. According to the forging capacity of the Baisheng forging hydraulic press, it is roughly equivalent to; Shaft forgings with a single weight of 5 tons or more and disk forgings with a single weight of 3 tons or more.
Large forgings are essential for the development of national economy, defense industry, and modern science The production capacity and technological level of the main basic components in the device are one of the main indicators to measure a country's level of heavy industry development and self-sufficiency in major and key technological equipment.