Since the first CNC machine tool was introduced in the United States in 1952, it has been more than 40 years old. Computer numerical control (CNC) has appeared in the mid-1970s, and it has been more than 20 years now. The numerical control technology is becoming more and more mature. Especially in recent years, the rapid development of the microcomputer, microelectronics industry and power electronics industry, the close integration of microcomputers and CNC technology, has enabled the development and production of CNC systems to be mastered by more and more automated equipment manufacturers. Therefore, in today's world, CNC technology is no longer monopolized by several CNC system manufacturers in a few countries. By the end of the 1980s, almost every industrially developed country had its own CNC equipment manufacturing plant, which produced CNC systems needed to meet the needs of CNC machine tools and other mechanical equipment in their respective countries. Even many large CNC machine tools have their own products and partially sell CNC systems. Therefore, the competition between CNC system manufacturers is fierce, and the development of CNC technology has entered a new stage.
The development of contemporary CNC technology has the following characteristics:
1. Widely used computer resources
In recent years, microcomputers called personal computers (PCs) have developed rapidly, and the high-speed development of large-scale integrated circuit manufacturing technology has made the hardware structure of PCs small. The main CPU is running faster and faster. IPC386's main frequency is 33MHz, IPC486, 586's main frequency can reach 50 ~ 120MHz, the recent Intel Pentium processor (Pentium), the main frequency has reached 450MHz. The memory capacity is also large and the volume is small, and since it is mass-produced, the cost is lowered and the reliability is improved.
In terms of software, the development of operating systems, especially Windows applications, makes PC operations easier and more intuitive. The software of CAD/CAM is transplanted from PC to workstation in large quantities, and the 3D map display and process database are built on the PC. Coupled with the openness of the PC, it has attracted a large number of technicians to invest in the development of software, making the PC's software resources extremely rich.
Therefore, better use of PC's software and hardware resources has become a very important method for CNC equipment manufacturers in various countries to develop CNC systems. From 1992 to 1993, first introduced in some small CNC equipment factories in the United States and Europe, such as the 1100, 1200, 1400 series launched by ANILAN in the United States and the 10/20/30 series of FIDIA in Italy, all using PC as the The substrate is used to develop its own CNC system. Nowadays, companies such as Japan's FANUC, Mitsubishi, and Germany's SIEMENS, which are known for producing specialized CNC equipment, have adopted PC resources as an important direction for their development. They all emphasize the "openness" of their systems. Japan's FANUC Corporation refers to the CNC system using PC as an open CNC system, with series 150, 160, 180 and 210, and is developing a FANUC intelligent terminal (a tablet computer compatible with IBM PC). The mode in which the high speed cable is connected to the CNC unit.
China's China Everest CNC Company's "Eighth Five-Year" research results "China Type I (CME988)" also uses PC as the main control board, so that the system can make full use of PC resources, and upgrade with the development of PC.
2. Miniaturization to meet the requirements of mechatronics
With the development of microelectronics technology, the integration of large-scale integrated circuits is getting higher and higher, and the volume is getting smaller and smaller. The CNC equipment factory adopts a very large-scale integrated circuit and adopts a surface mount process (SMT) to realize three-dimensional assembly, and the entire CNC device is made small to meet the requirements of mechanical and electrical integration of the mechanical manufacturing industry.
Japan's Mitsubishi Electric Corporation, recently introduced the popular CNC MELDAS 50 series and the practical CNC MELDAS 520A series, both of which use 32-bit RISC microprocessors to achieve ultra-small CNC devices, compared to the original M310 and L3, L3A, the volume is greatly reduced (H168mm × W76mm × D135mm), the installation area is reduced by half, and the function is improved.
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Sealand is a trustworthy manufacturer of Coriolis mass flow meter, Coriolis mass flowmeter, Coriolis meter, Coriolis flow meter and Coriolis flowmeter, ATEX, CE & IECEx approved.
The flow meter size covers from DN03 to DN150, and bigger models are being developed. The main specification is as follows.
Model No.
Diameter
(mm)
Max. flow rate
(kg/min)
MWP.
(MPa)
Accuracy grade
(%)
Zero stability
(kg/h)
CG-03
03
6
4
0.1/ 0.2/ 0.5
0.012
CG-06
06
18
4
0.1/ 0.2/ 0.5
0.04
CG-15
15
50
25
0.1/ 0.2/ 0.5
0.12
CNG-20
20
120
25
0.1/ 0.2/ 0.5
0.36
CG-25
25
200
4
0.1/ 0.2/ 0.5
0.62
CG-40
40
500
4
0.1/ 0.2/ 0.5
1.60
CG-50
50
1000
4
0.1/ 0.2/ 0.5
2.38
CG-80
80
3000
4
0.1/ 0.2/ 0.5
7.05
CG-100
100
3600
4
0.1/ 0.2/ 0.5
12.00
CG-150
150
8000
4
0.1/ 0.2/ 0.5
50.00
Coriolis Mass Flow Meter, Coriolis Mass Flowmeter, Coriolis Meter, Coriolis Flow Meter, Coriolis Flowmeter
Zhejiang Sealand Technology Co., Ltd. , https://www.sealandflowmeters.com