Special sketch
High-speed, heavy-duty, precision ball screw and linear guideway development, as well as high-speed, heavy load, precision rolling components of the industrialization of key technology development and application of research topics, high-end CNC machine tools and basic manufacturing equipment of national science and technology major projects focused research direction one. Its research and development of rolling components with high-speed, heavy load, precision and other characteristics of the machine tool enterprise production of high-end CNC machine tool supporting the key pieces.
A major breakthrough
The success of the series of high-speed, heavy-duty and precision rolling components has been complemented by the high-speed gantry five-axis machining center to meet the processing needs of complex special materials in the aviation manufacturing industry.
Application prospects
The products have narrowed the gap between domestically produced rolling components and the international advanced level and have broad prospects in the substitution of imports.
Among the major national science and technology projects of high-end CNC machine tools and basic manufacturing equipment, Nanjing Process Equipment Manufacturing Co., Ltd. (hereinafter referred to as Nanjing Process) undertook the research and manufacture of high-speed, heavy-duty, precision ball screw and linear guide and high speed, heavy load and precision rolling Functional components of the industrialization of key technologies development and application of two topics.
High-speed gantry five-axis machining center products are mainly used for aerospace manufacturing complex special materials processing, its ball screw pair, rolling linear guide pair in accuracy, effective stroke, shaft speed, and rolling features such as noise, temperature rise and so on Have high requirements.
In response to the above requirements, Nanjing Technology identified two major technical difficulties of the rolling machine parts supporting the machine: the Y-axis ball screw pair and the X-axis linear guide pair have high requirements on high speed, heavy load and precision.
Due to the large inertia of the Y axis ball screw, the choice of how big the lead, what kind of cycle structure and how to drive can achieve high speed, how big the ball can achieve high load, how to restrain the temperature rise and so on have become the difficulties of the project. The X-axis linear guide rail with what type of structure to meet the high-speed, high rigidity heavy load requirements, for 6 meters length how to ensure precision guide rail is still the difficulty of the project.
Faced with the above series of technical difficulties, Nanjing Technology successfully developed a series of high-speed, heavy-duty and precision rolling functional components using the collaborative innovation model of production, study and research.
In the high-speed, heavy-duty, precision ball screw development: the main way to use screw-driven screw to solve the problem of large inertia, screw hollow cold strong suppression of temperature rise. In the face of the lead screw, it is necessary to realize the actual contradiction between high speed and high rigidity and bearing capacity. The screw pair adopts a special cyclic return structure design, and applies dynamic theory and CAE simulation technology to optimize the design of the cyclic return structure. The low-order and high-order stiffness models of the ball screw pair were constructed. The contact deformation model of the ball screw pair was studied. The lead and ball diameter of the lead screw pair were reasonably selected to ensure the high load and rigidity of the screw pair. In the key process, the method of identifying the chattering and burn phenomenon of grinding is studied. By measuring and analyzing the dynamic characteristics of the machine tool, the influence of the dynamic characteristics of the machine tool on the grinding quality of the ball screw is found out, Vibration and burn phenomenon of grinding process to ensure the surface quality of the ball screw. The mathematical model of the internal thread interference mill with large lead is established. The bottleneck of the precision grinding of the large lead ball nut raceway is solved by real-time correction of the cross-section of the grinding wheel.
In the aspects of high speed, heavy load and precision linear guideway, in order to meet the high rigidity and heavy load, the guideway pair adopts the roller with small elastic deformation as the rolling body. Through the research on the contact rigidity and friction mechanism of the cylindrical rolling body, Shape optimization design to improve the roller as rolling elements of the rolling guide pair of static and dynamic load, to achieve ultra-high rigidity.
In order to meet the high-speed operation and low noise of guide rail pairs, the design increases the holding chain in the roller interval to eliminate the reverse obstruction and collision between the rolling elements of the rolling linear guide pair during high-speed running so that the rolling elements can ensure Smooth and stable rolling, combined with the improvement of the structure of the circulatory system, making the guide rail in the high-speed operation of noise and heat greatly reduced, to achieve high-speed, high precision rail movement.
At the same time, in order to verify the structural design and manufacture of the above products, Nanjing Technology also set up a high-speed ball screw and high-speed rolling linear guide test bench synchronously to make the screw, guide rail under high-speed conditions accuracy, noise, temperature rise, Performance test specifications, and high-speed ball screw and high-speed rolling linear guide to conduct performance test research.
It is reported that in the implementation of major national science and technology projects, Nanjing tooling has also for the high-speed gantry five-axis machining centers, five-axis machining centers, precision horizontal machining centers, high-speed vertical machining center to provide comprehensive support effectively promote the CNC machine tools The implementation of special products and development.
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