Analysis of a new generation of high speed and high precision machining center VCS series technology

With the continuous development of manufacturing technology and the application of new material processes, the performance requirements of the manufacturing machine for machine tools are getting higher and higher. The pursuit of high efficiency, high precision and high reliability is an eternal topic in the development of CNC machine tools. Ningxia Little Giant Machine Tool Co., Ltd. has been providing high-end CNC equipment and intelligent factory management software with superior performance and advanced technology to China's manufacturing industry for 12 years. Currently, it has vertical machining center, horizontal machining center and CNC turning center. Wait for three series, more than 20 models. It has supplied more than 12,000 machine tools to 2,500 customers covering various industries. In 2012, based on the previous high-performance vertical machining center VCN series, the new upgraded version of the new high-speed high-Precision Machining center - VCS series.

One: basic characteristics

Dynamic table C type structure vertical machining center, BT40 spindle specifications, fully enclosed protection. Taking the VCS530C model as an example, the X-axis stroke is 1050 mm, the Y-axis stroke is 530 mm, and the Z-axis stroke is 510 mm. (Working table size is 1300*550mm, bearing weight 1200Kg) It is equipped with MAZATROL SMART new numerical control system, featuring high control precision, intelligent, convenient operation and more practical functions.

Two: high speed, high production efficiency

[Spindle] Direct-coupled AC motor with a maximum power of 18.5KW adopts double-winding switching technology to meet the demand for low-speed and high-torque in heavy-duty applications and high-speed and high-power processing of non-ferrous metals. The standard configuration has a maximum speed of 12000 rpm and a maximum output torque of 95.5 Nm. The acceleration time from 0 to 12000 rpm is only 2.0 seconds.

[Feed] The servo motor power of the feed axis is 3.5KW. It is directly connected to the lead screw and provides excellent acceleration and deceleration performance and feed rigidity of the feed axis. The maximum axis feed rate is 42m/min and the acceleration is 0.6G.

[Change tool] Double servo cam type ATC tool change mechanism, CC tool change time is 2.8S (TT is 1.3S), and the nearest knife set is used. In high-volume production, the non-machining time is greatly shortened.

Three: high rigidity, high precision stability

After strict finite element analysis of the basic casting design, the static rigidity is greatly improved, reaching 0.02 um / N. THK SRG series roller linear guides are adopted for all feed axes. Compared with ordinary ball linear guides, the load can be carried in four directions of radial, reverse radial and lateral directions, which improves the rigidity of linear drive and guide. This increases the rigidity of the entire machine and ensures better cutting performance.

The main shaft adopts ceramic bearing technology, with low thermal expansion coefficient and light weight, which ensures the rotation precision and high rigidity. At the same time, it has the characteristics of low noise and sinter resistance, which prolongs the operating life of the spindle bearing. The three-point balance technology of the spindle unit and the application of the flexible connection technology effectively suppress the vibration of the spindle during high-speed operation and improve the processing quality. In addition, ceramic bearings can be directly lubricated with grease, which reduces the environmental pollution caused by a large amount of waste oil from oil lubrication.

Thermal displacement is an important factor in the accuracy and stability of machine tool processing. Little Giant's VCS series of vertical machining centers employ a number of advanced technologies to improve and respond to the effects of machine thermal displacement.

1: The overall thermal balance design of the machine tool; including the reasonable arrangement of the components that are easy to heat. (such as transformers, hydraulic units, etc.)

2: Forced constant temperature circulation cooling is performed on the spindle housing and the spindle sleeve to reduce the thermal displacement of the spindle.

The screw cooling cooling (optional) function is adopted to reduce the thermal deformation of the screw due to the reciprocating motion, thereby ensuring stable high positioning accuracy.

3: Intelligent thermal displacement compensation function. By adding a thermal displacement correction temperature sensor to the base of the machine tool, the column, the headstock, etc., by comparing and comparing the changes in the ambient temperature and the substrate temperature, the machine feed coordinates are performed according to a preset mathematical model of the thermal displacement. Computation compensation to offset the effect of thermal deformation of the machine structure on accuracy.

Four: high performance, intelligent CNC system

The VCS series of vertical machining centers use the new high-speed and high-precision MAZATROL SMART control system. Adhering to the system operation of MAZATROL man-machine dialogue mode, and strengthening the application of EIA/ISO customers, it is very easy and convenient to deal with multi-variety processing occasions and small-scale high-volume processing occasions. Built-in powerful expert database system provides the most valuable cutting conditions and application parameters for operating programmers. Thereby further improving the efficiency and accuracy of programming. The intelligent operation navigation interface can be easily switched between the position display, program monitoring and tool management, or at the same time. In addition to the high-speed and high-precision basic control performance, the SMART CNC system is intelligent and automated. Intelligent thermal displacement compensation (ITS) effectively compensates for the influence of machine temperature and thermal deformation on machining accuracy. Intelligent machining vibration suppression (AVC) suppresses machining vibration by adjusting and changing the feed axis acceleration and deceleration commands in a timely manner. Improve the surface quality of the machine; intelligent operation and maintenance, with alarm history query, periodic inspection prompts, servo control monitoring and other functions, greatly facilitating the operator's inspection and maintenance of the equipment.

Five: lead the numerical control equipment leading the manufacturing mode

The current Chinese manufacturing industry is moving towards factory automation, digitization and networking, which will be a revolutionary upgrade of the traditional processing and manufacturing industry, and will drive and upgrade the quality of industrial products, and the benefits will be developed to a higher level. Little Giant's VCS vertical machining center series has various options configuration modes required by FA (Factory Automation); it includes a two-exchange workbench 2PC format and various forms of automated manufacturing units. The SMART system has an open network interface for easy plant information and remote online diagnostics and monitoring. The advanced plant management software CPC (CYBER PROUCT CENTER) scientifically and effectively solves the four most critical operations of the manufacturing plant: auxiliary programming, tool management, program management and equipment operation monitoring. Thereby improving overall efficiency and equipment start-up rate.

Conclusion. The development of products and technologies is endless, and the needs of the market and customers are constantly improving. The above technical analysis of VCS series products is shared with everyone. I believe this product will win the trust of the market and users with its excellent technical characteristics and good cost performance.