Oxyfuel Cutting： MOST ECONOMICAL PROCESS
Oxyfuel flame cutting is the most economical process for the cutting of mild and low alloy steels, even with weld preparations. It is one of the most important production processes in the metal industry.
Oxyfuel cutting is a combustion process using oxygen/fuel gas flame. The heating flame brings the material up to its ignition temperature. Then a jet of Oxygen at least 99,5 % pure is blown onto the heated spot. The Oxygen jet oxidizes the metal. The torch is moved and a narrow cutting kerf is created, removing the slag from the kerf. The quality of the cut depends on the surface condition of the material, cut-velocity and thickness.
All low alloy steel with a material thickness up to several decimeters can be cut with this process. Despite the increasing significance of the other cutting processes such as plasma and laser cutting, oxyfuel flame cutting is still a very economical process. For heavy material thicknesses up to 900mm there is no alternative to flame cutting.
Machine flame cutting ensures reliable hole-piercing, good cutting quality and allows the production of components to their finished sizes without the need for further processing. For weld seam preparations V, Y and K cuts can be produced.
Plate thickness: 3 mm up to 2800 mm
Typical: 10 mm up to 300 mm
Good cut quality
Smooth, vertical cutting surface
Metallurgical perfect surfaces (oxidized)
2、Plasma Cutting: FAST, ACCURATE AND HIGH QUALITY
Plasma cutting was originally developed for the thermal cutting of materials which were unsuitable for flame cutting, such as high alloy steels or Aluminum. Today, the process is also used for the economical cutting of thin, low alloyed steels.
WHAT IS PLASMA? THE FOURTH STATE OF MATTER
One common description of plasma is to describe it as the fourth state of matter. We normally think of the three states of matter as solid, liquid and gas. For a common element, water, these three states are ice, water and steam. The difference between these states relates to their energy levels. When we add energy in the form of heat to ice, the ice melts and forms water. When we add more energy, the water vaporises into hydrogen and oxygen, in the form of steam. By adding more energy to steam these gases become ionised. This ionisation process causes the gas to become electrically conductive. This electrically conductive, ionised gas is called a plasma.
HOW PLASMA CUTS THROUGH METAL
The plasma cutting process, as used in the cutting of electrically conductive metals, utilises this electrically conductive gas to transfer energy from an electrical power source through a plasma cutting torch to the material being cut.
The basic plasma arc cutting system consists of a power supply, an arc starting circuit and a torch. These system components provide the electrical energy, ionisation capability and process control that is necessary to produce high quality, highly productive cuts on a variety of different materials.
The power supply is a constant current DC power source. The open circuit voltage is typically in the range of 240 to 400 VDC. The output current (amperage) of the power supply determines the speed and cut thickness capability of the system. The main function of the power supply is to provide the correct energy to maintain the plasma arc after ionisation.
The arc starting circuit is a high frequency generator circuit that produces an AC voltage of 5,000 to 10,000 volts at approximately 2 megahertz. This voltage is used to create a high intensity arc inside the torch to ionise the gas, thereby producing the plasma.
The Torch serves as the holder for the consumable especially nozzle, and especially electrode, and provides cooling (either gas or water) to these parts. The nozzle and electrode constrict and maintain the plasma jet.
- Plate thickness: 0,8 mm up to100 mm
- Typical: 3 mm up to 75 mm
- High to very high cut quality
- Smooth, cutting surfaces
- Metallurgical perfect surfaces for welding
- Medium heat input
- Excellent cutting speed
- Low harding on cutting surface
3、How to use a cnc cutting machine
CNC Machining is a process used in the manufacturing sector that involves the use of computers to control machine tools.
Tools that can be controlled in this manner include lathes, mills, routers and grinders.
The CNC in CNC Machining stands for Computer Numerical Control.
On the surface, it may look like a normal PC controls the machines, but the computer's unique software and control console
are what really sets the system apart for use in CNC machining.
Under CNC Machining, machine tools function through numerical control. A computer program is customized for an object and
the machines are programmed with CNC machining language (called G-code) that essentially controls all features like feed rate,
coordination, location and speeds. With CNC machining, the computer can control exact positioning and velocity.
CNC machining is used in manufacturing both metal and plastic parts.
First a CAD drawing is created (either 2D or 3D), and then a code is created that the CNC machine will understand. The program
is loaded and finally an operator runs a test of the program to ensure there are no problems. This trial run is referred to as
"cutting air" and it is an important step because any mistake with speed and tool position could result in a scraped part or a damaged machine.
There are many advantages to using CNC Machining. The process is more precise than manual machining, and can be repeated in
exactly the same manner over and over again. Because of the precision possible with CNC Machining, this process can produce
complex shapes that would be almost impossible to achieve with manual machining. CNC Machining is used in the production of
many complex three-dimensional shapes. It is because of these qualities that CNC Machining is used in
jobs that need a high level of precision or very repetitive tasks.
If you are considering a career in CNC Machining, it would be useful to have a background in mathematics,
industrial arts and mechanical drafting, as well as computer usage.