Views:0 Author:Site Editor Publish Time: 2020-11-19 Origin:Site
Pipe bending machine has a very wide range of applications on metal structure, agricultural machinery, power machinery, as well as boilers, petrochemical, electric power, light industry, and other industrial sectors. With the rapid development of economic construction, the number of a variety of tube bending machine and forming pipe fittings, specifications and material requirements are constantly increasing, the patterns continue to renovate, while the precision and surface quality of the pipe bender put forward higher requirements. This feature is particularly prominent in certain industries such as power systems.
• Pipe bending machine processing methods
• The characteristics of roller bending machine
• Factors affecting the bending process-ability of the pipe
Roller bending machine processing method is quite a lot, according to the bending method, it can be divided into rounding, push bending, pressure bending and roll bending; bending with or without filler can be divided into core (filler) bending and no core (filler) bending; bending whether or not heating can be divided into cold bending and hot bending.
Cold bending method has a long history of development, more types, while the hot bending method is only developed in the last two decades bending processing methods. The main tube cold roll-forming processing methods are:
1) pressure bending;
2) wrapping bending;
3 ) rotary die bending;
4) pull bending;
5) roll bending;
6 ) push bending and other forming methods.
In addition, there are expansion tube bending, vibration and impact bending, wrinkle bending, MOS bending and other bending processing methods, but generally not commonly used. In the actual tube cold bending process, rotary die bending (or rotary draw bending radial-draw bending) is the most common bending processing methods, but also the use of CNC pipe bending machine bending processing. The tube forming process discussed in this paper is under this bending process method of research.
Compared with solid plate bending, the pipe is hollow thin-walled structure of the cross-sectional shape, the stress-strain state analysis can be seen, the pipe in the bending process, the neutral layer outside the tensile stress and thinning of the pipe wall, the neutral layer inside the compressive stress and thickening of the pipe wall, while the pipe cross-sectional distortion, that is, flattening. Therefore, no matter what kind of bending method is taken, in the pipe bender process, easy to produce the following kinds of adverse phenomena:
1 ) pipe bending outside the thinning, or even cracking;
2 ) Tube bender inner thickening, or even unstable wrinkling;
3) pipe section distortion (flattening), or even deflated.
Moveover, as the pipe bending is elastic-plastic deformation, when the load is removed, the pipe bender angle and bending. Radius will occur elastic recovery, that is, springback phenomenon; at the same time, in the bending process, the pipe is subject to tensile stress. At the same time, in the bending process, the pipe is subjected to tensile stress. and produce elongation, that is, elongation phenomenon.
All these phenomena not only affect the pipe bending accuracy, but also determine the steel bending machinability (i.e. the pipe bending processing limit).
There are many factors that affect the pipe bending machinability, which are summarized as follows:
a ) pipe bending machine shape parameters, including diameter, wall thickness, bending radius, cross-sectional shape, etc.;
b ) Pipe characteristics, including yield stress, ultimate stress, elastic modulus, hardness, poor work hardening index, anisotropic parameters, etc.
c ) The accuracy of the tube itself, such as the country, uneven wall thickness of the spoon hook degree;
d )the machining process, the method of machining:
e )bender, shape and size of "bend" and "core" communicator;
f )cavity slippage condition of the cavity, etc:
g ) the working temperature of the machined portions.
which are a, b), c) the common material parameters, d), e), f), g) the common machining conditions.
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