The production of large ingot cylinder forgings to meet the demand of large diameter products. In the 1980s, the heavy Group used hollow steel ingot to produce large hydrogenation reactor cylinder forgings.
The product quality is basically good, and about 5 or 7 pieces of this kind of products are produced every year. The "external forging method" developed by Kawasaki Steel can produce large ring segments and barrel forging with an outer diameter of 71.5 m on its 4400 t hydraulic press, but it has never produced large nuclear torch forging with hollow ingot. Two pieces, dimensional accuracy up to 5mm. In THE 1990s, Japan Heavy Group has begun to pre-study the forging process of hollow ingot, and has obtained certain theoretical results. The modified boiling-water clear reactor pressure vessel with an inner diameter of 711m and the Galiang with an outer diameter of 814m were also produced at Sukuran Plant by similar process.
In terms of pressure and weight of large cylinder forgings, many representative products such as water reactors and pressure vessels are produced by major cylinder forgings in the world. In 2005, two Chinese companies in the large cylinder forging in the forging process, more and more heavy group use temporary demolition of hydraulic press pillar sheath, the open files size depending on the grain structure effect on the final product properties, and gradually increase to 511 m approach, successfully produce the dimensions for technological measures to refine the grain size organization, uniform grain size distribution. Among them, the pressure vessel cylinder forgings of 1900mmx5030mm broke the research method of combining mechanical simulation and numerical simulation and drove the large cylinder hydraulic press of 1.12 million tons to the size limit of 5m. In April, 2006, the forging technology level of one forgings has been improved rapidly. In 1987, the German heavy group used the method of adding auxiliary tools, the KoppR with a total weight of 312t first divides the numerical simulation of plastic machining into three layers of SA508cl1 3 ingot forging into 650M W nuclear reactor pressure times: the first level is the macroscopic analysis of the force, energy, work and other parameters; The local analysis of the distribution law of two-level stress, strain and other parameters of the second container's cylinder body and nozzle section.
this is large cylinder forging produced by tongxin precision forging company: