ADVANCED TECHNOLOGY OF HEAT-EXCHANGE PIPE ROLLER ROLLING
Authors:
Type:
Article
Pages:
from 42
to 48
Status:
Published
Received:
01.04.2016
Accepted:
01.04.2016
Published:
01.04.2016
Language:
Russian, English
Keywords:
pipe, pipe plate, bridge, rolling, roller rolling, stress, radial deformation.
Abstract (English):
In this paper on the basis of experimental numerical investigations carried out and factory experience it is shown that the process of heat-exchange pipe roller rolling differs from a widely used idea that in the course of rolling a pipe approaches uniformly to a cylindrical surface of an opening in a pipe plate and then presses itself causing at that elasto-plastic deformations in a pipe plate. In fact, at rolling a pipe deformation occurs in the form of a rotating triangle (for three-roller rolling) with increasing sides. Pipe pressing to an opening side is carried out in some points the number of which grows with the increase of a rotational moment. At that, only an elastic deformation of bridges in a pipe plate takes place. The final contact stress in a coupling is caused by the interaction of different metal layers, a part of which is stretched, and another part is compressed.
In this paper on the basis of experimental numerical investigations carried out and factory experience it is shown that the process of heat-exchange pipe roller rolling differs from a widely used idea that in the course of rolling a pipe approaches uniformly to a cylindrical surface of an opening in a pipe plate and then presses itself causing at that elasto-plastic deformations in a pipe plate. In fact, at rolling a pipe deformation occurs in the form of a rotating triangle (for three-roller rolling) with increasing sides. Pipe pressing to an opening side is carried out in some points the number of which grows with the increase of a rotational moment. At that, only an elastic deformation of bridges in a pipe plate takes place. The final contact stress in a coupling is caused by the interaction of different metal layers, a part of which is stretched, and another part is compressed.
Keywords:
pipe, pipe plate, bridge, rolling, roller rolling, stress, radial deformation.
pipe, pipe plate, bridge, rolling, roller rolling, stress, radial deformation.
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