CNC bending machine is a modern universal tool for the production of parts of complex shape from sheet material (usually metal). Choosing the right equipment with a huge number of options is not so simple. Everyone needs a durable, accurate and reliable machine at the best price.
Design
Consider the device of a CNC bending machine:
- Working moving parts.
- Electric stuffing.
- Software.
The main working body of the CNC bending machine is the crosshead. The exact dimensions of the resulting part depend on its movement. Since the length of this beam is quite large, 2 points along the edges are used to control the position. 2 motion control sensors installed.
Some machine models control the middle part called the rear programmable stop. The traverse movement accuracy can reach 0.01 mm. The resulting bends of the part depend on the design features and the availability of options: straight, semicircular, with several bends.
To test the technology and study rack programming, there are simulators of a CNC bending machine. The models on the screen are presented in 2D and 3D views. Initial testing of the bending part process on a computer can reduce the risks of programming errors. This will avoid the cost of released marriage and breakdown of the working bodies of the press.
Which model to choose?
The main criteria when choosing a CNC bending machine:
- The dimensions of the working space corresponding to the dimensions of the workpiece: length, width, thickness of the sheet.
- The type of metal affects the capabilities of the machine. It is recommended to purchase a machine designed for a large thickness multiple of three. For example, it is possible to bend copper with that traverse that can no longer pull steel of a similar thickness. Safety margin will allow in the future to expand production tasks.
- Availability of options. One of these is the ability to install special jaw nozzles so as not to scratch the painted surfaces of the part.
- The presence of add-ons to eliminate the effect of sagging a long crosshead. Usually this becomes necessary when the length of the machine is more than 3 m.
- Machine transportation options.
CNC bending machine can be quickly dismantled to move to another production area. The most accurate are stationary presses with heavy beds.
How does the equipment work?
The beam before the bend is at the highest point. In manual mode, the workpiece is brought to the desired point and the pedal is depressed. Often the operator holds the buttons on the remote control with two hands to start the press. This is a kind of protection against clamping hands in the bend zone.
For each type of material and its thickness, a certain working speed of the traverse is selected. This is necessary to eliminate defects when bending the sheet. The movement is carried out from a controlled drive with a displacement sensor - linear and angular - in the engine.
Two sensors provide backlash compensation in transmission mechanisms. The accuracy of the traverse is comparable with the characteristics of the rulers. You can choose more expensive models with axis positioning of several microns.
ERMAKSAN Model Description
Turkish bending machine with CNC Power-Bend PRO 2600-100 from the manufacturer Ermaksan has a low cost. An option such as a manual sheet deflection compensation system can be added to the current model. The working length of the unit is up to 2600 mm.
The movement is carried out hydraulically. The front part of the sheet is supported by two stops. Work of the machine from the Cybelec CybTouch 12 PS controller. The operator sees on the screen a 2D model of the process. The CNC controls four axes. The bending parameters are clogged manually, the rest of the process is calculated automatically.
Positioning accuracy is carried out using linear sensors with a resolution of 0.01 mm. A similar sensor is used to control the X axis, which is responsible for the approach and retraction of the rear stop. The machine has a front caliper with a T-slot and a clamping system of the Punch type.
The machine develops a force of 100 tons. It is recommended to select power modes that are 3 times higher than the technology requirements. This will reduce the likelihood of rapid wear of the working bodies, and will expand the possibilities of production in the future. It must be remembered that different types of metals with the same thickness bend at excellent forces.