Status quo and development of domestic gantry machining centers and CNC gantry boring and milling machines I. current domestic production status and level
1. Basic production overview since the tenth five year plan, especially in the last two or three years, with the continuous development of the national economy and the strong support of the state for domestic digital control machine tools, the demand for gantry machining centers and CNC gantry boring and milling machines in many important industries in China is growing. Where there is demand, there is market, there is production. This is the law of market economy. Therefore, many domestic manufacturers who have never been involved in manufacturing gantry boring and milling machines have taken the initiative to develop various gantry machining centers and CNC gantry boring and milling machines through the introduction of technology, cooperative production and other forms to meet the needs of the majority of users. According to the statistical data and other relevant data of key backbone enterprises by China Machine Tool Industry Association, in 2005, 11 enterprises in China had mass produced 422 gantry machining centers and 75 special CNC gantry boring and milling machines. Among them, there are 3 enterprises with an annual output of more than 80 sets: Shenyang Machine Tool (Group) Co., Ltd., Ningbo Haitian Precision Machinery Co., Ltd. and Weihai Huadong Numerical Control Co., Ltd. In 2005, Shenyang Machine Tool Group produced 135 sets of products including five axis linkage gantry machining center, accounting for 32% of the total output of the gantry machining center
2. Product structure form
the CNC gantry boring and milling machine with automatic tool change structure is the gantry machining center. At present, the main types of gantry machining centers and CNC gantry boring and milling machines produced in China are divided into: gantry fixed workbench mobile type and gantry mobile type according to whether the gantry frame moves or not; According to whether the beam moves on the column, it can be divided into moving beam type and fixed beam type; The beam moving on the elevated bed is called the elevated type; According to the net weight of the machine tool and the bearing capacity of the workbench, it can be divided into light, medium and heavy (super heavy). At present, the main specifications of the production range are various specifications and sizes, such as workbench width of mm, length of mm, etc. It should be pointed out that in the gantry machining centers and CNC gantry boring and milling machines produced in China in 2005, about 90% of the specifications are concentrated in the millimeter size segment, while 95% of the varieties are almost beam fixed workbench mobile. In contrast, the width of the worktable is more than 3m, especially the moving beam type super heavy gantry machining center and CNC gantry boring and milling machine with a width of mm, which are technically difficult and have a high technical content. At present, only one or two of them can be produced in China
3. Product technology level during the Tenth Five Year Plan period, relying on Qingdao International graphene innovation center and graphene industry technology innovation strategic alliance, China's machine tool industry has developed the fastest in five years. Through the introduction of technical cooperation and production, great progress has been made in the research and development of new products. Great breakthroughs have been made in high speed, high precision, multi axis, compound and other aspects of high precision, especially the gantry machining center and CNC gantry boring and milling machine. Since 1999, Jiangsu duoling (the former Changzhou Machine Tool General Factory) took the lead in breaking the Western blockade and successfully trial produced China's first five axis linkage CNC gantry boring and milling machine with independent intellectual property rights, many companies, such as Jinan No.2 Machine Tool Co., Ltd., Guilin Machine Tool Co., Ltd. and Beijing No.1 Machine Tool Co., Ltd., have launched five axis linkage gantry machining centers and CNC gantry boring and milling machines. In particular, at the China CNC Machine Tool Exhibition (CCMT2006) held in Shanghai in February this year, the powerful Shenyang Machine Tool Group launched six large gantry machining centers at one time, three of which have five axis linkage function, one has five face machining function, and one is turning milling machining center, which also highlights the maturity of China's gantry machining centers and CNC gantry boring and milling machines in terms of five axis linkage function. In recent years, the main technical parameters of some factory products such as spindle speed, rapid feed and machine tool precision have approached or reached the international advanced level. In particular, by the end of June this year, Beijing No. 1 Machinery Co., Ltd. had signed a contract to produce 10 sets of super heavy moving beam gantry machining centers and CNC gantry boring and milling machines with worktable widths of 4 meters and 5 meters in only one and a half years, indicating that some of the manufacturers of medium and high-grade heavy and super heavy gantry machining centers and CNC gantry boring and milling machines in China have entered the ranks of international machine tool manufacturers in terms of output and technical level
4. Strive to innovate and continuously improve
at recent domestic machine tool exhibitions, we have seen that China's gantry machining centers and CNC gantry boring and milling machines have greatly improved in terms of structural performance, technical level and product quality. However, compared with similar products in developed countries, there is still a big gap. First, the ability of independent innovation is not enough. At present, most of the high-end products are mainly imitated or produced by introducing technology cooperation, and lack of independent knowledge brands. The key core technologies and key functional components are often purchased from abroad. For example, at this year's CCMT2006 Shanghai Machine Tool Exhibition, a total of 8 five axis linkage gantry machining centers were exhibited. The key components used - double swing angle milling heads. Except that Jinan No. Secondly, there is a big gap in product quality, especially in the reliability of the whole machine, which is also one of the most concerned problems of users. It should be noted that at present, except for a few enterprises, the technical content of Longmen products is generally low, and the industrialization of CNC machine tools is not high. These are the places where domestic main engine manufacturers need to make great efforts to improve seriously
II. Well known manufacturers and typical products
1. Beijing No. 1 machine tool plant
has a history of more than 40 years since Beiyi trial produced the X212 gantry milling machine in 1960. In particular, in the 22 years since 1984, Beiyi has introduced the advanced technology and cooperative production of the world's famous manufacturer of CNC gantry boring and milling machines, Germany walderickburg, through digestion, absorption and scientific research, It not only successfully cooperated in the production of 8 heavy and super heavy gantry machining centers and CNC gantry boring and milling machines, but also mastered the key core technologies and realized technological innovation and technological progress. So far, Beiyi has formulated a development plan for a full range of gantry products, and developed moving beam, fixed beam, movable workbench and gantry movable according to the market demand according to the product modular design principle. The specification range is mm in the width of the workbench, and the length of the workbench is 2000. From billet to final forming is a time-consuming and high wood forming production process. The light, medium, heavy and ultra heavy products of 28000mm have been sold in total, of which 120 have been sold, More than 50 sets of heavy and ultra heavy products
in recent two years, Beiyi has provided a batch of heavy processing equipment for the ordnance industry and developed xha2140 × 120 moving beam gantry machining center and xka2140 × 80 CNC gantry boring and milling machine. Including xha2140 × 120 is the largest movable gantry machining center in China. Main technical indicators: workbench size 4000 × 12000mm, main power 60/84kw, capacity of tool magazine 60 PCs. These two products not only adopt a number of advanced key technologies that have been mature for a long time, for example, multi-functional wide speed regulation high-power ram boring and milling head; Hydrostatic worm coating forming worm bus bar transmission technology; Dynamic balance detection and compensation technology; More than a dozen items, such as the automatic adjustment mechanism of tool inclination, and also conquered the synchronous driving detection and adjustment technology of moving beam lifting; Vertical and horizontal bi-directional tool changing technology of manipulator; A number of new technologies, such as automatic loading and unloading of multi-functional accessory milling head, especially the machine tool standard adopts the German Coburg enterprise standard higher than the international standard, so that these two products reach the contemporary international advanced level
Figure 1 xka2150 produced by Beijing No.1 Machine Tool Plant × 170 CNC gantry boring and milling machine
2, Jinan No.2 Machine Tool Group Co., Ltd.
since 1992, it has introduced the advanced technology of the famous machine tool manufacturer faustrina of France, and has carried out long-term cooperative production. Since then, it has developed CNC gantry boring and milling machines and gantry machining centers in various forms, such as workbench mobile, gantry mobile, fixed beam, moving beam, etc
at the second China CNC machine tool exhibition held in Shanghai in 2002, Ji'er first launched xhv2720 × 60 fixed beam gantry mobile five axis linkage gantry machining center has been able to produce and supply the market in small quantities
xhv2420 five axis linkage fixed beam gantry machining center produced in 2005 adopts such key technologies as milling head oil mist lubrication and cooling, beam prestress anti deformation control, etc. The b-axis and c-axis double rotary angle milling heads are developed by using the harmonic reduction transmission mechanism to realize the five axis linkage function. The power of the double swing angle head main motor is 20kW, the speed of the electric spindle is 12000r/min, the rotation angle of axis B is ± 110 °, and the rotation angle of axis C is ± 200 °. In order to ensure the transmission accuracy of the machine tool, the X, y and Z axes are controlled by precision grating ruler, and the B and C axes are controlled by high-precision angle encoder, so as to realize full closed-loop control. At present, the five axis linkage gantry machining center and CNC gantry boring and milling machine produced by Ji'er have been recognized by users such as water pump industry and rail cars
Figure 2 the xhv2420 five axis linkage fixed beam gantry machining center of Jinan No.2 Machine Tool Group
3 and Shenyang Machine Tool (Group) Co., Ltd.
for many years, ZOJE Machine Tool Co., Ltd. and Zoje rocker drilling machine plant under Shenyang Machine Tool (Group) Co., Ltd., which have been famous for producing drilling and boring machines, have absorbed and, Vigorously develop gantry five face CNC machine tools suitable for China's national conditions. At CIMT2005 and CCMT2006 machine tool exhibitions, several five axis linkage and five face gantry machining centers and CNC gantry boring and milling machines were launched. In 2005, Shenyang Machine Tool (Group) Co., Ltd. produced 135 gantry machining centers and CNC gantry boring and milling machines of various specifications in one year, which is a historic breakthrough. It has made great contributions to promoting the industrialization of Longmen products in China
at the 2006 China CNC machine tool exhibition, ZOJE Machine Tool Co., Ltd. of Shenyang machine tool group exhibited the gmc2580u bridge gantry five axis boring and milling machining center, which is equipped with Italian FIDIA double swing angle milling head to realize the five axis linkage function. The workbench size of this machine tool is 2500 × 8000mm, spindle speed r/min, main motor power 42/55kw, spindle head b-axis angle +95 ° -110 °, c-axis angle ± 200 °. The machine tool adopts an elevated beam moving layout, with high spindle speed, high power, and white, gray and light blue multi hole colors. It is an ideal equipment for processing titanium alloy frame parts and large wall panel molds in the aerospace industry
Figure 3 gmc2580 U-type bridge gantry five axis boring and milling machining center of Shenyang machine tool group at the same exhibition, the gtm320140 gantry mobile turning and milling machining center, jointly produced by Shenyang No. 1 machine tool plant of Shenyang Machine Tool Group and the merged German heath company, is equipped with a composite rotating workbench and a horizontal moving gantry. The maximum machining diameter of the workbench is 3200mm, and the rotation speed of the workbench is turning/milling/r/min, The workbench and x/z axis adopt hydrostatic guide rail. The machine tool is built-in RAM structure. The section of the ram is 280 for boring and milling × 240mm, driven by double spindle motor, the boring and milling spindle motor is 52kw, and the boring and milling spindle speed (1st/2nd gear) is 520/3150r/min. This product has realized the turning and milling compound processing function, which also reflects that the domestic gantry machining center and CNC gantry boring and milling machine have begun to develop towards the compound function
Figure 4 the gtm320140 gantry mobile turning and milling machining center of Shenyang Machine Tool Group
4 and Guilin Machine Tool Co., Ltd.
over the years, through cooperation with Beijing University of Aeronautics and Astronautics and Huazhong University of science and technology