pipes, plants, & process
these steels, the bending machines used here must have the necessary bending forces. Yet despite the strength, these materials react more sensitively and wall-thickness tapering and out-of-roundness can occur in the tube bend. It is therefore essential that the tube bending machines engaged for pipelines in power plant construction meet the corresponding tolerance specifi cations. These include, for example, the European standard EN 12952 or that of the American standard ASME B31.1. Meeting these standards plays a signifi cant role, in particular in light of the fact that power plant construction makes increasing use of smaller boilers with higher capac- ity. Heavier wall thicknesses and smaller bending radii of the tubes and pipes are required to manufacture these high- performance boilers. Not infrequently, the minimal bend- ing radius must be 1xD, depending on tube diameter (and
solution. It has two bend heads which can be moved verti- cally and horizontally (1x left bending, 1x right bending), which bend the tube alternately clockwise and anticlockwise. In this manner, the machine offers high fl exibility, for example when manufacturing superheater coils. The tube serpentine does not need to be turned after each bend, which guar- antees quick and economic production processes and the manufacture of long side lengths. As an option, both bend heads can also bend in the same bending direction. By using different-sized bend formers, different-sized bending radii can be produced.
Especially conceptualized for power plant construction, the CNC 100 DB Twin also takes into consideration the initially described properties of tubes made of high temper- ature-resistant steels. For a Chinese power plant builder, for example, Schwarze-Robitec designed both the CNC 100 DB
The CNC 100 DB Twin bends high-strength materials with process reliability with a bending radius of 1 x D and below.
sometimes less than 1xD). This can pose a signifi cant chal- lenge in view of the high temperature-resistant and sensitive materials that are being bent.
Two Bend Heads for Effective Production Cost-effective processes can be designed for bending such materials and sizes as well as in the construction of the power plants themselves. Lean production processes, for example, are one of the key contributors to cost effective- ness in pipe and tube bending. For instance, time-optimized production of complex serpentine pipelines—i.e., those with complex series of bends—can be accomplished using machines with two bend heads. The CNC 100 DB Twin by Schwarze-Robitec (Cologne, Germany) represents such a
Twin and the customer-specifi c bending tools according to international standards. The power plant builder produces boiler tubes made of the high-temperature resistant steels with dimensions from 32 x 3.5 to 63.5 x 13 mm.
Fully Automatic Manufacturing Chains Fully automatic manufacturing chains make a further contribution towards cost effi ciency in power plant construc- tion. When storage, material-handling and manufacturing technology interact optimally, they reduce cycle times and positively impact the performance and competitive edge of a company. Schwarze-Robitec has developed an automation concept with which all machines can be fi tted with optional extras, depending on bending order, and expanded to a fully-
37 — Energy Manufacturing 2016
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