1、外文资料及译文Special processing GeneralitySpecial processing which is also called non-traditional machining or modern processing method, referring to electrical energy, heat energy, light energy, electrochemistry energy, chemical energy, sound energy and mechanical energy, such as special processing metho
2、ds to remove or add material energy. Special processing technology is mainly described in this article refers to the laser processing technology, electron beam processing technology, ion beam and plasma processing technology and processing technology, etc. With the development of new type weapons an
3、d equipment, the increasingly urgent demand for special processing technology at home and abroad. Both aircraft, missiles, and other combat platforms are required to reduce the structure weight, improve the speed, increased range, reduce fuel consumption, achieve lighter high performance, structure,
4、 long service life and good economic affordability. To this end, the weapon system and combat platforms are required to use integral structure, lightweight structure, the new structure, advanced cooling structure and titanium alloys, composite materials, powder materials, intermetallic compounds, su
5、ch as new materials. To do this, you need the special processing technology, equipment manufacturing, in order to solve processing problem of using conventional processing methods cannot be achieved, so special processing technology is the main application areas: Difficult-to-machine materials, such
6、 as high strength steel, titanium alloy, heat-resistant stainless steel, composite materials, engineering ceramics, diamond, ruby, hardened glass high hardness, high toughness, high strength, high melting point materials. Difficult machining parts, such as complex parts 3 d cavity type, hole process
7、ing, group of hole and narrow gap, etc. Low rigidity parts, such as thin walled parts, elastic element and other parts of the processing. With high energy density beam for welding, cutting, making holes, spraying, surface modification, etching and fine processing. 1. The laser processing technology
8、Laser processing equipment and processes abroad has developed rapidly, now has 100 kW high power CO 2 laser , kW level high beam quality of Nd: YAG solid laser, some with optical fiber can be transfer, telecommuting. Big power laser processing equipment, high automatic degree and has been widely use
9、d CNC control, multi-axis linkage, and is equipped with laser power monitoring, automatic focusing, industrial TV shows and other auxiliary system. Laser hole of minimum aperture has amounted to 0.002 mm, has succeeded in application of automation system of six coordinate laser hole special equipmen
10、t for processing, with holes on the combustion chamber, gas turbine engine to achieve to cast layer, the effect of the micro cracks. Laser cutting is suitable for the made of heat resistant alloy, titanium alloy, composite material parts. Currently BoCai cutting speed can be up to 15 m/min, narrow k
11、erf width, generally between 0.1 1 mm, heat affected zone is only 10% 20% of the kerf width, maximum cutting thickness of 45 mm, has been widely used in plane three-dimensional skin ship plate, frame, ships and helicopter rotor, engine combustion chamber, etc. Laser welding thin plate has been quite
12、 common, most are employed in the automotive industry, aerospace and instrumentation industries. Laser subtle welding technology has become an aviation electronic equipment, high precision mechanical equipment in the micro encapsulation nodes one important means of micro connection. Laser surface st
13、rengthening, surface remelting, alloying, amorphous processing technology application is more and more widely, laser microfabrication applications in electronics, biology, medical engineering has become an irreplaceable special processing technology. Laser rapid prototyping technology has expanded f
14、rom research and development stage to application stage, has shown broad application prospects. At home in the early 70 s has begun for laser processing applied research, but the development speed is slow. Hole in the laser system, laser heat treatment, welding, etc. Although have a certain applicat
15、ion, but the quality is not stable. Has developed a solid laser processing systems with optical fiber transmission, and realize the optical fiber coupling synchronization of the three beams welding and laser welding of quartz watch movements. Completed the laser sintering rapid prototyping principle
16、 prototype, and with polyester and epoxy resin sand sintered powder materials, rapid prototyping of typical parts, such as impeller, the gear. Laser processing technology in the next few years should combine pre-study achievements have been achieved, according to demand, focus on zero defect laser processing of gas membrane pores and control technology of real-time detection, high strength aluminum) (lithium containing aluminum, aluminum and magnesium a
