Due to technical constraints, in the 80s and 90s, the steel processing technology is still in, straightening machine can only straighten the steel, cut off the need for manual sizing and cutting.
With the advancement of technology, the emergence of steel straightening and cutting on a single steel straightening machine. This has greatly saved time in the processing of steel bars.Nowadays, most of what people call steel straightening machines are such steel straightening machines.
In addition to the above commonly used processing equipment, there are also machines for processing raw materials such as descaling, cold drawing, cold drawing, spot welding, butt welding and other forming processes.
Rebar processing machines are used to remove rust and oxidation skin from rebar to ensure good welding quality and good adhesion of rebar to concrete.
Both wire wheel brushes are used to remove rust and oxidation and to remove rust from rebar by means of a sand box, which uses friction between the sand and the rebar to remove the rust. Rust removal from reinforcing bars is usually performed during cold drawing, cold pulling, straightening and cutting.
Stretching the rebar over a range of stresses above the yield point, thereby increasing the yield point of the rebar by 20% to 25%. Cold drawing machines are divided into winch type cold drawing machines and resistance type cold drawing machines.
The winch cold drawing machine uses a winch to stretch the rebar through a pulley set. The cold-drawing speed is about 5m/min, which can draw coarse and fine steel bars, but covers a larger area. Resistance cold drawing machine is used to stretch coiled bars up to 8 mm in diameter.
The machine can be combined with a straightening and cutting machine to produce fixed-length cold-drawn steel bars directly.
This machine is used to draw Grade 1 bars with diameters of 6 to 10 mm through carbide or tungsten carbide drawing dies with diameters of less than 0.5 to 1 mm.
During the cold drawing process, the reinforcing bars are subjected to plastic deformation by stretching and extrusion at the same time. The cross-sectional area of the stretched bars is reduced, resulting in cold working strengthening and a 40-90% increase in tensile strength.
A machine that disrupts the ends of reinforcing bars, used as anchor heads for prestressed or cold-drawn bars. There are two types of headers, mechanical and hydraulic.
The working principle of hydraulic harvesting table is as follows: when the hydraulic cylinder pushes the clamp to clamp the rebar, the harvesting table die moves forward to squeeze the rebar head, then the spring pushes the die backward and releases the clamp, that is, the harvesting table is finished.
In addition to the commonly used electric welder and spot welder, butt welder and multi-head spot welder are also commonly used to butt joint rebar and make rebar mesh, which is characterized by high efficiency and low power consumption.
The working principle of contact butt welding is to clamp the rebar on two electrodes separately and make contact with the end of the rebar when energized.
A strong short-circuit current is impeded at the contacts, generating high temperatures that melt the metal and apply greater squeezing pressure to weld it together. As the metal melts and splashes in all directions, a flash is created, hence the name flash welding.
Multihead spot welders are usually capable of a variety of processing procedures such as straightening, mesh hauling and cutting, and can automatically produce formed mesh.
Steel reinforcement, as the skeleton of concrete, has become a widely used and abundant main material in building structures. Before pouring concrete, reinforcing steel must be made into a skeleton of a certain size and shape to be incorporated into the formwork.
In order to make the skeleton, the steel bars need to be reinforced, stretched, straightened, cut, bent and connected before they can be bundled and formed.
Due to the huge amount of reinforcement, it is difficult to be done manually and requires a variety of special machinery for processing, called reinforcement processing machinery, or rebar machinery for short.
Rebar processing machinery is to process coiled and straight rebar into the length size, bending shape or installation member required for rebar project installation, mainly including reinforcement, straightening, hoop bending, cutting, bending, member forming and rebar renewal equipment, rebar members.
There are many kinds of steel processing machinery, which can be divided into four categories according to the processing process: reinforcement, forming, welding and prestressing.
1、Steel reinforcement machinery: mainly includes cold drawing machine, cold drawing machine, cold rolling and twisting machine, cold rolling ribbed steel forming machine, etc.
The processing principle is that by applying a force to the reinforcing bar beyond its yield point, the bar will produce different forms of deformation.
2, rebar forming machinery: rebar straightening and cutting machine, rebar cutting machine, rebar bending machine, rebar mesh forming machine, etc.. Its role is to put the raw materials on the rebar, install a variety of concrete structures required to process the skeleton of steel forming.
3, rebar welding machinery: mainly used for rebar forming welding rebar welding machine, rebar spot welding machine, rebar mesh forming machine, rebar electroslag pressure welding machine, etc.
4、Steel prestressing machinery: tensioning machine and cutting table machine mainly composed of electric oil pump and jack, etc., used for steel prestressing tensioning operation.