Application of welding technology in the machine tool industry

The application of welding technology in the machine tool industry has been developed with the introduction of foreign product technology. At the same time, the development of domestic welding technology has also promoted the application of welding technology in the machine tool industry. At present, the main welding techniques used in the machine tool industry have the following aspects:

Steel plate pretreatment technology application

The steel plate pretreatment production line of the machine tool industry was started in 1993 by Jinan No. 2 Machine Tool Plant. It started on the basis of the shipbuilding industry, heavy machinery industry and mining industry. The pretreatment production line is jointly developed and manufactured by the plant and Qingdao No. 3 Foundry Machinery Factory. The main process flow is: steel plate leveling, preheating, shot blasting, automatic painting and drying, with a total length of 60 meters. The main technical parameters are: steel plate leveling thickness 8 ~ 40mm, leveling width 3m; pretreatment steel plate thickness 8 ~ 160mm, effective width 3m; processing structure maximum specification is 1500 (width) × 800 (height); pretreatment speed is 0 ~ 4m / min; annual processing capacity of 40,000 tons / year; using PC automatic control and manual control two ways. The steel plate pretreatment production line solves the bad factors such as rust and scale of raw materials, and improves the quality of CNC cutting blanking and the appearance quality of machine tools.

CNC cutting technology application

In 1982, the second CNC machine tool factory began to apply the domestic CNC cutting machine to the cutting and blanking of steel plate parts. In 1988, the computer automatic programming nesting technology was applied to increase the utilization rate of steel plate from 70% to 74%; 1992 In the year, Jinan No. 1 Machine Tool Plant introduced the US plasma CNC cutting machine and laser CNC cutting machine, and started the application of CNC plasma and laser cutting in the machine tool industry, so that the cutting precision of thin steel plate with thickness of 0.5~8mm reached 0.5~1mm. During the "Seventh Five-Year Plan" period, Jinan No. 2 Machine Tool Plant developed and researched the precision cutting technology of thick steel plate CNC, so that the thickness of CNC precision cutting of thick steel plate reached 275mm. The project won the first prize of the "Seventh Five-Year" technological achievements of the machine tool industry of the Ministry of Machinery. In 1993, Jinan No. 2 Machine Tool Plant increased the cutting thickness of CNC plasma carbon steel in the machine tool industry from 8mm to 25mm by introducing CNC underwater oxygen plasma cutting machine, which reduced the cutting deformation of medium and heavy plates and improved the cutting of medium and thick steel plate parts. Precision and cutting quality.

Application of high efficiency welding technology such as gas shielded welding

With the introduction of foreign technology, in 1981, Jinan No. 2 Machine Tool Plant first applied Φ1.6 solid CO2 gas shielded welding technology to replace the Φ2.4 core argon-rich gas shielded welding process of American VERSON All Steel Machinery Press Company. The welding process of the large welded parts of the press was tackled and succeeded. The project won the third prize of the Ministry of Machinery Science and Technology Progress. In 1986, Qiqihar No. 2 Machine Tool Plant applied Φ1.2 solid core argon-rich gas shielded welding technology to solve the welding problem of large welded parts of presses, and used the argon-arc copper surfacing technology to weld copper on the surface of pistons, cylinders and other workpieces. Layer surfacing, which is a success in replacing the traditional copper sleeves in China. In 1992, Jinan No. 1 Machine Tool Plant applied Φ0.8 solid CO2 gas shielded welding for the first time on the thin-plate cover structural parts of machine tools. During the "Seventh Five-Year Plan" period, Jinan No. 2 Machine Tool Plant also applied CO2 gas shielded welding to the extended welding of the tension bolts of the press. The project won the second prize of the "Seventh Five-Year" process achievements of the machine tool industry of the Ministry of Machinery. At present, high-efficiency welding techniques such as gas shielded welding have been widely used in machine tool beds, gears, eccentric bodies, rocker shafts, cylinder blocks, pipe flanges and casings that are not processed after welding, and have become machine tool industries. One of the main processes of welding.

The new vibration aging process is a new process technology developed in the 1960s. It has the advantages of strong applicability, energy conservation, environmental pollution reduction, shortened production cycle and improved production efficiency.

Jinan No. 2 Machine Tool Plant began to apply this process to the welded parts of imported products in 1981, and achieved good results. During the "Seventh Five-Year Plan" period, Huangshi Forging Machine Tool Plant conducted in-depth research and application on the vibration aging process, and won the second prize of the "Seventh Five-Year" process achievements of the machine tool industry of the Ministry of Machinery. At present, the process has been widely used in the machine tool industry.

Application of welding automation and mechanization technology

In addition to CO2 semi-automatic welding, the welding automation of the machine tool industry is mainly embodied in the application of submerged arc automatic welding, mainly used in the seam welding of steel plates and the barrel welding of pressure vessels. Jinan No.2 Machine Tool Plant introduced the automatic submerged arc welding equipment for domestic cross-operating frame purchased in 1988 by introducing the automatic seam tracking system and welding power source in the United States in 1993, and realized the pressure vessel cylinder and the head without the thickness of 18mm. The double-sided automatic tracking submerged arc welding of the beveling butt joint has achieved full success. The mechanization of welding is mainly the application of welding positioner. In 1981, Jinan No. 2 Machine Tool Plant started the application research of the positioner on the welding gear of the introduced product, but it was not promoted. Only the positioner was modified. Automatic cutting equipment for gear webs. After 1988, the welding positioner was applied in Shanghai Forging Machine Tool Plant, Yingkou Forging Machine Tool Plant and Huangshi Forging Machine Tool Plant, which improved the degree of welding mechanization. In addition, in 1998, Jinan Second Machine Tool Group Co., Ltd. successfully applied the positioner to the welding of 40GrMo high alloy gears in cooperation with Komatsu Japan.

Application of propane energy efficient and environmentally friendly cutting gas

Liquefied cutting gas such as propane is an energy-efficient and environment-friendly gas promoted by the national "Eighth Five-Year Plan" and "Ninth Five-Year Plan". In 1993, Jinan No.2 Machine Tool Group Co., Ltd. began to study the industrial application of propane liquefied gas. After a large number of comparative tests, in 1998, C3 series liquefied gas was used to replace acetylene gas, which greatly reduced production cost and improved production safety. And cutting quality, coupled with a new gas cutting nozzle, improves production efficiency.

Application of non-destructive testing technology

The application of non-destructive testing technology in the machine tool industry begins with the main welds of machine tool parts. For example, in 1975, Jinan No. 2 Machine Tool Plant established a radiographic inspection room while establishing a welding workshop. In 1989, the pressure vessel quality assurance system was established and improved according to national standards, and the GB150 "Steel Pressure Vessel" standard and JB4730 "Pressure Vessel Non-destructive Testing" standard were fully implemented.

In the early 1990s, the machine tool industry began to apply ultrasonic flaw detection technology to 20% sampling of the main welds of the main structural parts of machine tools, and implemented the national standard GB11345-89 "Manual ultrasonic flaw detection method for steel welds and classification of flaw detection results". The main parts of the welds to be inspected include the press base of the press base, the beam and the slider; the weld of the column and the slide rail; the bushing weld of the beam; the base, the beam, the upper and lower facing welds of the table and All splice plate welds and gear welds around the gear.

Application of centralized gas supply technology

The gas supply method of CO ² gas has also received attention in the welding production of the machine tool industry. At present, many domestic manufacturers basically use single-bottle single-machine gas supply. This gas supply method not only limits the expansion of production scale, but also has a great impact on welding production management and welding quality. The concentrated gas supply of CO2 gas improves the welding production efficiency, and also increases the purity of CO2 gas by 0.4-0.6%, and the moisture content of gas by 0.25%, which ensures the welding quality and is also applied in the welding production of the machine tool industry. For example, in 1992, Jinan Second Machine Tool Group Co., Ltd. built a CO2 gas centralized gas supply device while establishing a new metal structure plant. The total working pressure of the device is 0.15MPa, and the capacity of the intermediate storage cylinder is 2m3. It can continuously supply gas to more than 120 CO2 welders in the whole plant. At that time, the annual welding production capacity was 12,000 tons. By 2002, the annual welding production capacity of 15,000 tons was met. .

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