The advanced numerical control system is the key factor to ensure the high-speed machining quality and efficiency of the complex curved surface of the mold. Its characteristics are reflected in the addition and subtraction of pre-compensation, feedforward control, accurate vector compensation, optimal corner deceleration, safety protection and real-time monitoring. The basic requirements for high-speed machining of molds for CNC systems are:
High-speed digital control loop, such as 64-bit parallel processor, very short linear motor sampling time.
Feedforward control of speed and acceleration, and creep control of digital drive systems.
Advanced NURBS-based spline interpolation calculations for good surface quality, precise dimensions and high geometric accuracy.
Pre-processing function. The CNC is required to have a large-capacity buffer register, which can read and check a plurality of program segments (such as 1000~2000 program segments) in advance, so that the feed rate can be changed in time when the shape (curvature) of the machined surface changes. Cut and so on.
The error compensation function includes thermal error compensation due to heating of linear motor and spindle, quadrant error compensation, and measurement system error compensation.
In addition, the high-speed cutting of the mold requires high data transmission speed. Traditional data interfaces, such as the RS232 serial port, have a transmission speed of 19.2 kb, while high-speed machining centers have used Ethernet (Ethernet) for data transmission at speeds up to 200 kb.
3 Heidenhain iTNC 530 CNC System
HEIDENHAIN is a multinational group of companies specializing in the production of high-precision measuring components and CNC systems for more than 100 years. The high-performance CNC systems and measuring feedback components are widely used in the field of mold processing and high-precision machining.
Heidenhain's iTNC 530 control system is a versatile control system for milling machines, machining centers or processes that require optimized tool path control. The system's data processing time is 8 times faster than previous TNC series products. The "Fast Ethernet" communication interface can transmit program data at 100Mbit/s, which is 10 times faster than before. The new program editor has a large size. Program editing capabilities to quickly insert and edit information blocks. In the new system, the company separated the NC master computer from the drive control unit for the first time and installed an Intel processor. The machine is displayed on a 15-inch high-resolution XGA display (1025 x 768) or 10.4 inch (640 x 480) VGA display. Any operator familiar with the TNC system will soon be able to master the operation of this new system. The mechanic does not have to remember the G code, just use the key combination button to program the line segment, arc segment, and loop program.
For complex surfaces of mold processing, if you want to achieve high speed, high precision and high surface quality processing, you must have a good hardware foundation, good servo performance and high speed control.
The high-speed 3D controller Heidenhain iTNC530 features a faster 400 MHz AMD processor. All real-time tasks of the iTNC530 are done in the real-time operating system (HEROS) developed by itself, and also available with dual processors. The main computer, one is used to run the Heidenhain operating system, which is the core "New Heros" of the CNC, and the other is used to run the MS Windows 2000 operating system. It not only ensures the real-time computing and stability of the system, but also meets the needs of users for Windows applications.
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