In modern industrial manufacturing area, a great amount of cutting is applied, application of broad based technology, especially in the construction machinery manufacturing industry, cutting account for a large proportion of the workload, cutting efficiency and quality will directly affect the production efficiency and quality.
Here the light of the current status of modern cutting technology, combined with heavy plant cutting in the production of Jutiyingyong Zhong, the cutting technology in the construction machinery Selective application of elements for a Jiandan introduction.
1, cutting the status of technology, its applications and technical and economic In recent years, at home and abroad to achieve a breakthrough in cutting technology, the oxyacetylene flame from a single new industrial gas cutting into gas flame cutting, plasma arc cutting, laser cutting, water jet cutting and many other energy sources, a variety of methods, including the modernization process cutting technology, modern control technology at the same time in turn combined with the cutting technology, research and development of a new generation of automated cutting equipment.
A, status quo
1, flame / flame cutting of new gas Since 1895, the French LeChatelier invented oxyacetylene flame, 1900 Fouch and Picard created the first to oxyacetylene cutting torch, oxyacetylene flame cutting as the oldest technology is still thermal cutting machine in a processing method. As the raw material for the calcium carbide acetylene production, the production process emit large amounts of carbide (1t electric Shisheng Cheng 3.3t carbide) and HS, S0 and other toxic gases, serious pollution of the environment, in Preparation of acetylene gas at the same time a large number of important chemical consumption raw materials acetone, increased production costs.
The past 20 years domestic and foreign research institutions and enterprises have invested heavily in research and development of low cost, safety and reduce environmental pollution of new gas, the current domestic Ji developed and introduced a variety of new industrial gas instead of acetylene flame for industrial processing. At the same time with the new industrial gas cutting torch with supporting cast is also put into operation one after another, various kinds of cutting torch device complete. Hand cutting torch cutting thickness up to 350mm, machine torch cutting thickness up to 1800mm.
2, plasma arc cutting Plasma arc cutting is developed in the mid-80s as a processing method, was mainly to address the cutting of stainless steel and nonferrous metals, has developed argon, hydrogen, compressed air, nitrogen, oxygen and other gases, plasma arc cutting and general water re-compression process plasma cutting and other methods to meet different needs.
Common plasma power supply output current of 20 ~ 200A, cutting thickness up to 30mm below; Fine Plasma power supply output current up to 100A, cutting up to 12mm thickness below which fine plasma cutting width of 0.65 ~ 0.75mm, and CNC cutting machine with cutting precision up to ＼ 0.2mm; water and then compressed plasma power output current up to 1000A, the following cutting thickness up to 130mm.
Currently, plasma arc cutting machine cutting torch is moving close to the precision of laser precision slotted direction; small power cut power to the inverter direction to improve the efficiency and power of arc contraction; power cut power to the gate and the orientation develop and adopt certain remedial measures to improve efficiency, thereby enhancing the cutting speed and improve the cutting quality. In recent years, with the plasma arc technology, cutting 20mm carbon steel and low alloy steel below, its cutting speed and good overall efficiency in the construction machinery manufacturing industry applications on the rise.
3, laser cutting
Industrial application of laser cutting began in the early 70s of the 20th century. As the size of its cut quality, speed, high precision, high efficiency, in a variety of industries has been applied widely. As the power level of laser devices, improving stability and reliability and processing technology, has gradually expanded its application to various metals and non-metal sheet cutting. According to 2002 statistics show that: in the context of world industrial applications of laser, laser cutting the largest proportion, about 24%.
4, water jet cutting
Water jet as a means of industrial products, precision machining, which is characterized by the release of little or no heat, no heat distortion, no gas or vapor discharge. The cutting technology of the 20th century from the 60's, after 20 years of foreign research and development, creating the first high-pressure water jet cutting equipment, so that it can cut all kinds of metal and ceramic materials. Developed in China in the 90's high-voltage increase of a domestic type abrasive water jet cutting equipment and used for production. At present most of the water jet cutting equipment is mainly used in metal sheet cutting.
B, application forms
Either cutting technology, have different application forms, flame, plasma, laser cutting machines have a small CNC Coordinate product and cutting machinery.
Among the small flame cutting machine cutting technology up from the common semi-automatic gas cutting machine, profile gas cutting machines, optical tracking gas cutting machine to a dedicated steel gas cutting machine, saddle gas cutting machine is about more than 20 types of affordable, large, medium , both conditions with small businesses, is suitable for cutting staff can cut production under various conditions. In addition, also based on a small cutting machine to be improved in order to complete the U, V, Y, K-shaped groove and the ball valve groove cutting and intersecting line cutting and other technological requirements.
Coordinate NC cutting machine is the fastest growing industry in China cutting cutting equipment modernization is one of CNC cutting machine coordinates its good man-machine conversation interface and powerful features attached to help support, and is equipped with automatic programming, nesting, etc. software system support, so that the production of CNC cutting machine to play an important role in manufacturing enterprises has become the first choice for cutting.
C, technical and economic comparison
Currently, thermal cutting are widely used in construction machinery industry, while the flame, plasma, laser cut technology belong to three types of thermal cut, cut its three kinds of technical and economic comparison of technologies table below.
Technical and economic comparison table
Flame cutting machine to cut a large deformation, the lower cutting speed, cutting the former need to warm, take a long time, but at the same time can use the multi torch cutting, long life consumable parts. Although plasma cutting can be cut all the sheet metal, and many non-metallic materials, the maximum cutting speed up to 10m/min, flame cutting is 10 times, but the incision width greater than sheet, the cutting plane easy "edge collapse", and plate can be cut economically. Although the high price of laser cutting machine, but the sheet and plate for high speed, high-precision cutting at the same time to realize unmanned operation.

Second, engineering machinery manufacturing process requirements
Construction machinery in the manufacturing process, cutting and welding work piece has its inherent characteristics:
1, works with low carbon steel, low alloy high strength steel welded more, followed by decorative stainless steel, nonferrous metal and nonmetal small.
2, the annual consumption of steel capacity, with heavy plant, for example, the maximum throughput of nearly 10,000 tons / month
3, more focused use of carbon steel welded plate, for example, less than 20mm total heavy plate steel plant for more than 80% of total consumption.
4, construction machinery parts with particularity:
A, workpiece variety, type of material is relatively concentrated;
B, length of condition of a certain weight;
C, large parts slope, bevel the form of U, V, Y, K are different, there is no regularity;
D, part of the complex shape parts, high precision.
Third, cutting the application of engineering machinery
Cutting machinery for the construction process object, combining the characteristics of various cutting techniques to make construction machinery manufacturing industry in the use of various cutting techniques, cutting equipment, with the purpose of:
1) Water jet cutting for the first time, large investment, the construction complicated, and for the precision machining tool is not currently suitable for metal cutting machinery, the other three kinds of cutting can be used in the construction machinery manufacturing industry.
2) The construction machinery manufacturing industry mainly mechanical cutting equipment, automated gantry CNC cutting equipment, supplemented by small-scale cutting equipment.
To improve the cutting efficiency, materials efficiency, meet annual steel Liang of the cutting needs of engineering Jixie Zhizaoyexu Zhuyaocaiyong mechanization and automation of coordinate Shi Shukongshebei for the next Liaoshou Duan, such Ji save manpower, You Da Da reduced production of secondary Jiagong . In recent years, heavy plant for sustainable development, technical transformation speed up the processing means are experiencing leaps and bounds, from behind the secondary processing, multi-head flame cutting to CNC cutting technology. Currently, the plant has a NC Coordinate equipment has reached as many as 13 units, supplemented by a small number of small gas cutting and shear cutting equipment to digest material head, material side,
Improve material utilization, to solve a small part of the next feed.
3), plasma and laser cutting equipment, construction machinery manufacturing industry should occupy a certain proportion.
Application for construction machinery plate more elongated workpiece deformation, to improve efficiency and quality, improve overall efficiency of production, combined with some complex workpiece shape, high precision, engineering machinery manufacturing technology selection will be on the cutting need to increase plasma cutting, laser cutting equipment allocation. To meet the technological requirements of cutting objects, heavy plant in recent years, promoting the use of plasma, laser cutting, plasma cutting and laser cutting equipment, the proportion reached 70%, while also cutting technology at home and abroad the maturity of the selected device selectively determine the domestic procurement and imports.
4) The construction machinery manufacturing should use a certain amount of small flame cutting and plasma cutting equipment to groove machining and sheet metal shaping work. Meanwhile, CNC cutting machine coordinate consider increasing the bevel cutting function.
5) the application of the flame cutting should vigorously promote the adoption of the national recommended new industrial gas, and the application of oxygen instead of bottled oxygen.
Xuzhou Heavy plant back in the early 90s with oxygen propane instead of acetylene gas cutting gas cutting in recent years has been canned and bottled propane transformation of liquid oxygen, which greatly improved the cutting quality and efficiency, reduce security risk and save cost savings in materials.

In cutting technology, "fragrant garden of flowers" today, engineering machinery manufacturing cutting equipment will no longer be "thriving." In recent years, the plant has formed a small gantry cutting machine and CNC cutting equipment, skills, flame cutting and plasma, laser cutting technology compatible with the pattern.
Heavy plant cutting from the application of technology can be seen in the selection of cutting machinery, cutting equipment should pay attention to the following aspects:
First, the processing required to clear the object. For example: cutting material, thickness, and other special parts of the process, other companies need to understand the efficiency of the selected equipment requirements;
Secondly, the need to understand the development of cutting technology at home and abroad, level of maturity to understand the advantages and disadvantages of various cutting techniques, analysis of comprehensive benefits.
Third, the selection of cutting technology, the special requirement.
Fourth, promote the use of advanced technology, while cutting should be environmental protection, safety, energy, materials, increase related to new technologies, promote the use of new technology.