Looking at the development status of turning and milling combined machining center from CIMT2015

1 Introduction
CIMT2015, let me see the innovative ideas of the high-end technology and products of the world's most famous machine tool companies. In the case that China has become the world's largest machine tool consumer for five consecutive years, all machine tool manufacturers have made a big hit and exhibited new products with their own characteristics.

The exhibition brought together high-end exhibits from many famous brands, such as WFL, DMG MORI, Mazak, and Swiss Shawlin. Through a few days of exhibition, it is not difficult to find that flexible, composite, five-axis linkage, high precision, high speed is still the mainstream of CNC machine tool development, and constantly improving the automation level of machine tools is the goal of continuous efforts. The following is a brief understanding of the development of the turning and milling center after the visit.

2. Development of offshore turning and milling centers
When it comes to turning and milling composite products, the first thing that comes to mind is the products of DMGMORI, Mazak and WFL. Their machine tools are not only high precision, high efficiency, good stability, but also fine workmanship and very compact structure. The most impressive one is Sen. The NTX1000 multi-tasking machine exhibited by Seiki. The layout of the machine is very compact, giving the overall feeling of being small and delicate. In addition, the structure of the second main shaft adopts a reversible structure, which greatly increases the processing range of the B-axis. The other side of the reversible chuck is a top structure, and a small flip mechanism simultaneously converts the second spindle and tailstock. The machined workpiece can be fed to the discharge port through the chuck to realize automatic cutting. The design is very clever and the design concept is amazing. Every time I visit DMG's machine tools, I admire that it has such a bright and beautiful appearance, which inevitably attracts people to stop. DMG's CTX beta series and CTXgamma series are typical representatives of its horizontal five-axis turning and milling center. They all adopt the box-type B-axis structure, and are equipped with a first spindle and a second spindle, an upper tool holder module and a tool holder. The structure of the built-in spindle is adopted, and the speed of the tool holder can reach 6000r/min. In addition, the most striking is the rigidity of the DMG feed system. The 0° milling cutter seat is installed on the 12-station servo cutter, and the WTO home's spline hob is used. The processing of such splines is generally carried out on a dedicated flower-milling bed, for the reason that the spline cutter has too many cutting edges, and the 6-blade milling operation uses the principle of Archimedes involute, on the machine tool spindle, The bed and the cutterhead have a high range of rigidity requirements, not all machine tools can do it! Perhaps many turning-milling machine tools theoretically have this function, but vibration and noise will occur during actual cutting. When I visited the booth in Chaublin, Switzerland, I was deeply impressed by the two-axis turning and milling compound. The machine can also carry out milling engraving of the concave pattern of the end face and the bevel without the support of the Y-axis and the B-axis, and can mill various patterns and the surface finish to be achieved. The method adopted is to install a milling cutter head with an inclined angle on the power tool holder, and then perform machining according to X-axis and Z-axis interpolation. It can be seen through the protective door that the internal structure of the machine is compact, and the space for installing the second spindle and the Y-axis is reserved.

The US EMCO nine-axis turning and milling composite machining center is also eye-catching. The overall internal space of the machine tool is spacious. There are spindles and sub-spindle, and the same size of the spindle end is made of A2-6 model, and the left and right chucks can work at the same time. The maximum turning diameter of the bed is φ500, but the diameter can only reach φ65 when turning the bar, which is slightly limited. The turret is installed in the lower part of the main shaft. It is also a 12-station power cutter. The upper part is the B-axis. However, in the stroke direction, there are X/X2, Z/Z2/Z3, Y-direction and two spindles. . With a nine-axis machine tool, you can use the words "do whatever you want" to describe it. Car, milling, drilling, and attacking can be done at any angle. It is really capricious!

The Harding Group's T-Series machine tools have exhibited their own characteristics, and the hard turning technology has also shown its unique skills. The T-Series Turning Center sets new industry standards for high-performance, ultra-precision turning, bringing product quality and manufacturing capabilities to a whole new level. The new T-Series machines are incredibly versatile, suitable for two-axis high-precision machining applications and complex multi-tasking applications that require high precision, complex construction and one-shot forming. Designed and manufactured to achieve the highest turning performance, the T42 Ultra-Precision Turning Center is ideal for hardened turning and tough workpiece machining. Its excellent cutting performance eliminates expensive secondary machining, greatly reducing cost and reducing workpiece handling. time.

3. Development of domestic turning and milling center
From the perspective of the whole exhibition, the structure of the turning and milling machine tool has changed little. It is nothing more than the interpolating Y-axis, the vertical Y-axis and the box-in-box. These three forms of five-axis products are similar in domestic exhibitors. The products are on display. At the same time, there are also many highlights in the exhibits in the territory. The strong launch of Shenyang machine tool i5 system and i5 series machine tools has attracted a lot of attention. The i5 system is the first self-developed intelligent system in China, and its slogan is “Smart Manufacturing”. This is the first time in China that China's own nervous system has been built by a large-scale enterprise and a well-known university. The i5 system can be customized, and you can order the ashtray or your own zodiac at the booth. Just click on the graph on the computer. The i5 system machine can be interconnected with the mobile phone. When the 3D graphics are input on the mobile phone, the system can automatically calculate the cutting parameters and automatically generate the machining program. The operator does not need to remember the complicated G code, which is very convenient and fast; The production status and operation status are monitored from time to time. The Shenyang machine tool uses the i5 system to create the protective case of the mobile phone on the i5m1, which is light, beautiful and practical. The i40HY turning center exhibited by Dalian Machine Tool Group is one of the highlights: the main bed is made of 40° whole inclined bed for easy chip removal and good rigidity; the 12-station hydraulically driven turret and the horizontal sliding table are integrated to ensure the turret Stiffness; the turret with Y-axis function can realize the processing of turning, milling, drilling and boring.

There are also some manufacturers in the territory, such as Tianshui Xinghuo Machine Tool Plant and Henan Xinyang Machinery Factory, which also exhibit the characteristics of their own machine tools.

4 Conclusion
By visiting the CIMT2015 exhibition, we learned about the development trend of the world machine tool market and saw the high-end products of domestic and foreign machine tool manufacturers. Under the background of green environmental protection, designing a compact and advanced machine tool is the goal pursued by every machine tool builder. As a machine tool manufacturer, we must keep up with the world's most advanced machine tool development pace, market demand-oriented, close to customers, and develop more high-precision, high-reliability products. (Author: Zheng Zhiqiang Sun Xuenuo Shenyang Machine Tool Plant)

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