"New changes and new future" is the characteristics of the current development of the machine tool industry and the industrial market. From the perspective of the rolling function industry, despite the slowdown in global economic growth, major rolling feature manufacturers and their representatives, including Japan, Germany, Spain, Taiwan, and China, are actively participating in various large-scale exhibitions to showcase their latest developments. Products and concepts.
The five rolling functional components of the national science and technology major project, Hanjiang Machine Tool, Nanjing Craft, Jining Bote, Dalian Gaojin and Guangdong Kate in the past exhibitions, with unique booth ideas, rich innovative products for people to stay I was deeply impressed.
Exhibits are rich in characteristics
At the China CNC Machine Tool Exhibition held recently, a number of innovations were launched. Among them, Hanjiang Machine Tool, Nanjing Craft, Jining Bote, and Dalian Gaojin exhibited the ball screw pair with the reverse structure of the end face. It can be seen that all manufacturers have done a lot of work in the optimization of the reverse structure of the ball screw pair. It is hoped that the optimization of the reverse structure will improve the bearing capacity and running speed of the ball screw pair and reduce the rotating noise. At the same time, Nanjing Craft, Hanjiang Machine Tool and Jining Bote also exhibited the planetary roller screw pair. This product combines the planetary gear train structure and the screw transmission structure. Compared with the traditional ball screw pair, the planetary roller wire The bar pair "upgrades" the rolling element from the steel ball to the planetary roller, effectively increasing the contact radius and contact area of ​​the rolling element with the lead screw and the nut, thereby increasing the axial load of the screw pair and improving the contact of the screw pair. Stiffness, showing better precision retention; at the same time, the planetary motion of the rolling element can realize the recycling of the rolling element and abandon the traditional returning circulation device, thus breaking the limitation of the Dn value of the traditional ball screw pair, achieving more Reliable high speed operation. It can be used in high speed, large load, high rigidity and high reliability, such as spinning machine, cold rolling mill, precision forging and mining machinery. Guangdong Kate's LES136 aluminum alloy linear motion unit gives a refreshing feeling. This product combines the ball screw pair with the rolling guide pair, which is easy to install, small in size and high in precision. The 4016 and 5512 three-dimensional external circulation ball screw pair exhibited by Dalian Gaojin can make the ball run more smoothly, improve the running speed and stability of the ball screw pair, reduce the noise during the movement, and provide the manufacture of the ball screw pair. New choice.
The high-rigidity, high-speed precision ball screw pair was exhibited in the Nanjing Craft booth. This product is a new rolling function component developed for five-axis gantry machining centers and high-speed precision horizontal machining centers. It has the following characteristics: high precision retention: designing a forced cooling passage in the nut body, effectively suppressing the temperature rise of the nut under high speed conditions, and designing the screw shaft to be hollow, and providing the hollow cooling of the screw shaft at high speed rotation. The related sealing and supporting unit provides a comprehensive solution for strong cooling of the lead screw, suppresses the temperature rise of the screw under high speed conditions, and double strong cooling effectively improves the precision retention of the product. High rigidity: For medium and high speed applications, the screw pair optimizes the circulation chain. By changing the position of the traditional end return device, the circulation chain is reasonably distributed in the double or multi-channel ball return pipe on one nut. Realize the displacement pre-tightening to eliminate the gap and improve the rigidity of the screw pair; high speed: the optimized structure, the number of the ball nut circulation chain increases, the circulation passage is shortened, effectively reducing the number of non-bearing rolling elements in each circulation chain, so that the wire When the bar pair returns at high speed, the response speed is fast, the energy loss is small, the starting is stable, the rotation is more flexible, the line speed reaches 60m/min or more, and the Dn value can reach more than 150,000.
Ball screw and spline integration series: This product combines the basic movement functions of ball screw pair and ball spline pair (rotary motion and linear motion), so that the roller spline sleeve and the ball nut are in the same spline The most important feature of the screw shaft is that it requires only two power inputs and the simplest input control to achieve single-axis multi-degree-of-freedom motion and its transformation: the rotary motion transformation of the spline sleeve For the spiral motion of the screw, the rotational motion of the nut is converted into a linear motion of the screw, and the coordinated rotational motion of the spline sleeve and the nut is converted into the rotational motion of the screw. It can be used in the Z-axis of multi-joint industrial robots, ATC (tool automatic change) device, assembly robot, automatic loader, etc.
Magnetic grid guide pair: A rolling linear guide pair with high-precision position measurement and feedback designed by integrating the magnetic grid measuring system and the guide rail. Because the magnetic scale is embedded in the inside of the rolling guide, the thermal deformation of the magnetic grid is as small as the rolling guide, which ensures the accuracy of the measurement; only the accurate installation of the rolling guide can simultaneously use the function of the magnetic grid system, and the system can be directly connected to On the control system, it is very convenient to use.
At present, the company's magnetic grid guide rail can be as long as 6 000mm, and the measurement resolution can be specially designed and manufactured according to the actual working conditions of the user.
Servo Direct Drive Nut Rotating Compound Unit: This product skillfully combines rolling function components with electronic components, and is mainly used in high-speed, precision positioning linear motion applications. This product integrates the servo motor, encoder and rolling bearing, ball screw pair, and directly drives the nut rotation through the servo motor to realize linear motion and precise positioning. Compared with the above-mentioned traditional nut drive unit, it is “servo motor + ball wireâ€. Bar pair
Compared with the mode, it eliminates the transitional transmission links such as couplings, timing pulleys and gears. It has the characteristics of high efficiency, high precision, low vibration, low noise, small moment of inertia and compact structure. It also has lubrication, dustproof and cooling. And other auxiliary functions.
Hanjiang Machine Tool exhibited a hollow ball screw pair with a diameter of 70mm, a pitch of 20mm and a length of 6m. The ball screw pair was successfully applied in the gantry machining center and has a hollow forced cooling function, which can suppress the high-speed operation of the ball screw pair. The temperature rise, therefore, high positioning accuracy, good precision retention, low moment of inertia, low noise, suitable for high-speed, high-precision large machine tools.
GQ161.5×40 heavy duty ball screw pair, the screw steel ball φ 30mm, the diameter of the steel ball used is the most in China, the rated dynamic load reaches 203t, the rated static load is 879t, which is used in the automobile manufacturing industry and mold industry. The successful development of the stamping machine tool marks a significant progress in the application of heavy-duty ball screw pair manufacturing technology and processing equipment.
The rolling guide clamps the slider and prevents the micro-motion under the oscillating load by the hydraulic clamping force. It can be used with the guide rail of the same specification to improve the rigidity, effectively reduce the cutting vibration, and significantly improve the processing quality. It is suitable for various CNC machine tools.
DZ55 damping slider, which uses the elastic body attached to the raceway to absorb shock by adjusting the contact gap between the four raceways of the slider and the track of the guide rail. In use, the damper slider is mounted on the rail pair and is coupled to the table by bolts. The table drives the damper slider to move on the guide rail together with other standard sliders. The vibration generated by the entire rail system is absorbed by the damper slider, which reduces the vibration of the system and improves its stability. The installation of the damper slider reduces the vibration of the entire rail system, improves the machining quality and extends the life of the tool.
Test conditions and manufacturing levels have improved significantly
In recent years, the National Science and Technology Major Project has invested huge amounts of money in the rolling functional component industry to continuously support it, reflecting the country's high attention to this industry. The five leading enterprises undertaking major science and technology projects have taken advantage of this favorable opportunity to invest in manpower and material resources. Emphasis on basic application theory, basic manufacturing technology, and the development of test benches, and successively established laboratories or R&D centers for product research and development. Each has added CNC machining equipment to make the design level and test level of China's rolling functional component manufacturers. The manufacturing level and capabilities have been greatly improved. In addition to the display products, the Kate booth on the exhibition also showed the rolling guide auxiliary stiffness tester, the guide rail sub-motion precision and the friction force measuring instrument. In addition to the main performance test equipment, Jining Bote also showed on-site demonstration of heat treatment test of screw material, which showed the implementation of major national science and technology projects, and promoted the basic conditions of new product development, high precision and high efficiency processing equipment. Construction.
Application of products on medium and high-grade CNC machine tools
Through the implementation of major national science and technology projects, the new products developed by the project have replaced imports in the main engine factory and medium and high-grade CNC machine tools, and have achieved gratifying results.
The GQ161.5×40 heavy duty ball screw pair developed by Hanjiang Machine Tool has been successfully applied to the stamping machine tools in the automotive mold manufacturing industry.
GQ70×20×4680×5240 hollow ball screw pair, with a bore diameter of 20mm, is used in large gantry machining centers. In addition, it also provides special replacement new products for high-end imported equipment of Chengfei and Xifei. In the 2012 special science and technology project undertaken by Hanjiang Machine Tool, Hanjiang Machine Tool has provided project products to the four famous domestic manufacturers of Beijing Electromechanical Institute, Anyang Xinsheng, Zhongwei Dahe and Tianshui Xinghuo, which will be high-speed, heavy-duty and precision rolling. The functional components are verified on the DV850 machining center, AD35, AD25 CNC lathe, CKW61125EJ CNC lathe and other machine tools to form an application demonstration.
Nanjing Technology signed a project cooperation agreement with Shenyang Machine Tool Zhongjie, Qizhong CNC, Qiji Machine and Nanjing Second Machine. The high-speed, heavy-duty and precision rolling components of the project will be carried out at the four famous domestic manufacturers. Application verification to form an application demonstration. And has provided project products for machine tools factories such as Shenyang Machine Tool, Changzheng Machine Tool, Wuzhong, Guilin Machine Tool.
The new products completed by Jining Bot have been promoted and applied on Kunming Machine Tool, Jinan Second Machine Tool and Shenyang Machine Tool High-grade CNC Machine Tool with good results.
The three-dimensional external circulation ball screw pair, the end-side circulating ball screw pair, the high-speed heavy-duty ball screw pair, the roller linear guide pair and the self-lubricating roller linear guide pair developed by Dalian Gaojin are all widely used in Dalian machine tools. Machining center and CNC lathe.
Guangdong Kate has developed through special projects, and the roller linear guides developed by the company have reached the technical specifications of major special regulations. The motion accuracy of the products can reach the highest level in the country in batches, the highest speed reaches 90-120m/min, and the highest acceleration is 1~. 2g. The product quality stability and reliability fully meet the technical requirements of medium and high-end CNC machine tools, and can replace similar imported products.
There are still gaps in the future direction
From the perspective of domestic and foreign enterprises that participate in the rolling features of this exhibition, the varieties of domestic rolling functional components are relatively single, reflecting the gap between the research and development level and reliability of domestic rolling functional components and foreign products. The gap between strength and product function and performance is still large. At present, the domestic rolling functional component industry first solves the problem of consistency and reliability of large-scale production.
The major national science and technology projects put forward the application and reliability of key technologies in industrialization. The five key enterprises invested heavily in the addition of CNC hot and cold processing equipment and test and test equipment, and held a reliability seminar to discuss improving product reliability. Ways and methods.
It is believed that through the joint efforts of the industry, with the support of major national science and technology projects, the rolling functional component industry will certainly have great development.
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