1. Discussion on numerical control technology
There are control shafts in CNC press brakes, which generally have more than two axis.
The two important axis are the rear stop axis, which is also called X-axis, and its accuracy is generally required to be less than 0.1mm.
The other axis is called ram, also known as Y axis. The accuracy of this axis needs to be controlled below 0.01 mm.
After explaining the axis of CNC press brake, we will further elaborate and explain the development of NC system.
1. Multi axis control technology
In the numerical control system, if we want to improve the accuracy of control and make the operation process more convenient and fast, we often add something called motion axis in the numerical control system.
There are many cases similar to adding axis to operate together, but there is only one ultimate purpose, which is to improve the quality of products and the efficiency of operation process.
2. Replacing DC servo motor with AC servo motor
AC motor is characterized by its reliable operability, high frequency torque, high output power, high dynamic servo and low moment of inertia.
In short, AC servo motor has high advantages over DC servo motor, so we generally use AC servo motor to replace DC servo motor.
3. Adoption and application of advanced CPU
CNC system has been well developed from being discovered to now.
At first, the CNC system was 8-bit, then developed into 16 bit, and then to the 32-bit CNC system, the whole system has been well improved and developed in many aspects, such as great changes in control, programming and management.
The graphics programming process and bending process developed to the later stage can display the pictures and bending process with a very high resolution, which makes people more intuitive when observing the bending operation of the NC system.
Another point is that after using the high-level CPU processing system, the control system has more storage space on both hard disk and floppy disk, so that the system can carry more things.
4. Carry out research on rich software and good operation adaptability
We can use the software disk or the keyboard engraved with standard characters and letters to write the program. In this way, the programming process can be more simple and clear, easy to be mastered and understood by people.
Let’s give a substantive example, such as LVD company in Belgium, whose plate processing equipment is very famous in the world.
The CNC system of the press brake owned by this company has reached a high level.
There are many different types of systems in their company, which are suitable for different jobs.
2. Application of CAD and CAPP
When NC programming is completed, this process is generally operated by humans.
This process has high requirements for people.
People not only need to describe and understand each process of the programming process, but also need to understand the accurate position of each axis of the press brake and the adjustment of some auxiliary functions.
This step is a very complex process.
In addition to this complex process, we also need to consider a series of problems, such as improving productivity and minimizing the time required for programming.
In our NC bending technology, our current research direction is to apply CAD and CAPP to automatic programming system.
In the following, we will conduct a detailed study and description of the functions of the automatic scheduling processing process.
1. Determine the optimal scheme of the workpiece in the bending process
The best we define here is not the best in the traditional sense.
The optimization we point out here is a better scheme relative to the required accuracy of the workpiece and the production standard.
It is a relatively optimal concept.
We should make intelligent modification according to the actual situation when making automatic arrangement, and we can’t stick to the rules.
For example, when the program written does not meet the user’s requirements for this work, the user can modify it freely. Users can modify the content of the program according to their specific needs, so as to meet their requirements for program writing.
2. Simulated bending process
During the bending process, we can use pictures to show the proper operation of this part at a certain position during the bending process.
We can visually observe and analyze the operation process in the form of pictures, so that the operation process can qualitatively display the details of the bending operation process in the form of pictures.
We can also dynamically show the bending process through video, so that people can observe the bending process more directly.
Through the video, the bending process can be observed and demonstrated through dynamic observation. This not only improves the authenticity of the operation process, but also reduces the sense of distance with people during operation, so that people can show and express the bending process more closely.
In this way, the bending parameters can also be expressed, and the bad and fault can be alarmed to provide information for people.
3. Generate NC program
NC programs are programs that are programmed automatically.
This program can make the machine tool bend the parts automatically, improve the work efficiency, reduce the use and consumption of manpower, and reduce the use of manpower and material resources.
One program associated with DC is DNC program.
This line requires the system through the control device of the press brake.
After the line sends the required command to input the NC program, the NC program will be input after the command is returned by consent.
In some cases, we can also modify the contents of the sent instructions, and the modified information will be returned to the computer.
In the process calculation, the step of calculating the compensation amount of springback is a particularly important aspect.
When we are processing a part, we should choose a correct angle.
If the angle has some deviation, we need to adjust the angle properly, and then transfer the adjusted angle to the control device.
When the system knows a correct angle, it will carry out reasonable operation.
When making process arrangement, we should clarify the purpose of process arrangement.
The arrangement of the process is generally to determine the motion sequence and speed between each axis.
In addition, we also need to adhere to the established principles of arrangement.
This principle is to avoid interference between the workpiece to be processed and the machine tool and die, and process in different ways according to different accuracy requirements for workpiece processing.
Based on the current development and related applications of the CNC press brake, we can see that the press brake machine has become more and faster in operation after combining intelligent and automation technology, which greatly facilitates our use of the machine for bending processing.
It not only greatly improves our work efficiency and work quality during bending, but also lays a foundation for our observation of the bending process, and provides us with very good observation conditions, so that we can observe the picture with relatively clear picture quality, and let us have a more intuitive and specific understanding and observation of the bending operation.
In short, the development of press brake has great prospects. In terms of NC bending, we still have a broad development space and prospects.