Titanium alloys are recognized as difficult to machine materials. Composite materials that only need to be laid and entangled do not seem to require a large amount of processing, but the processing quality requirements are getting higher and higher. For the tool industry, this is no small challenge. Previous Next Municipal Street Light,Single-Head Garden Lamp,Double-Head Garden Lamp,Outdoor Street Light Jiangsu chuanglv Transportation Facilities Co., Ltd , https://www.clsolarlights.com
Table: Comparison of material usage of Boeing aircraft in recent years
In addition to the fuselage structural components, the processing of aircraft engines is also a difficult point. The engine is generally made of difficult-to-machine materials, and has a complicated shape. It requires grooving, blade processing, etc., and the actual cutting effect of the tool is very high. In addition, in order to meet the high quality requirements of aircraft structural parts, in general, the whole piece is used for processing, but in fact more than 90% of the material will be cut off. The processing volume is large, and the processing efficiency is extremely high.
(II) Development trend of cutting technology From the development history of cutting tools, from the end of the 19th century to the middle of the 20th century, tool materials were mainly represented by high-speed steel; in 1927, Germany first developed hard alloy tool materials and obtained wide application; In the 1950s, synthetic diamonds were synthesized in Sweden and the United States, and the cutting tools began to be represented by superhard materials. In the 1970s, people used high-pressure synthesis technology to synthesize polycrystalline diamond (PCD), which solved the problem of rare and expensive natural diamonds, and extended the application range of diamond tools to aviation, aerospace, automotive, electronics, stone, etc. Multiple areas.
The choice of tool material is the basis for successful machining. Compared to cemented carbides, PCD cutters can reach speeds of up to 4000 m/min, while cemented carbides have only 1/4 of them. In terms of life, PCD tools can generally be increased by 20 times. From the surface quality of the processed, the effect of PCD is 30%-40% better than that of cemented carbide. In addition, the development of CBN (Nbright Boron Nitride) superhard material tools and surface coating tools has also contributed to the advancement of cutting technology.
For more than 100 years, the cutting speed of cutting tools has been continuously improved, which has brought about changes in machining efficiency, which has further expanded the processing range. The biggest mark of the development of cutting processing is the development of high speed cutting (HSC).
A high-speed machining system involves many aspects. From the processing point of view, the traditional cutting process, a workpiece such as a mold, through the blank annealing - roughing - finishing - quenching - EDM preparation - EDM - special finishing - manual polishing procedures. The high-speed machining only needs the quenching-roughing-semi-finishing-finishing and super-finishing of the blank. In terms of steps, it is reduced by three, and the processing time is shortened by 30%-50% compared with the conventional processing method; This advantage is especially noticeable when machining small parts. What's more, in the past, some companies used to make complex molds, which basically took 3 or 4 months to be delivered. After high-speed cutting, it only took half a month to complete.
A high-speed machining system consisting of two parts: tool and technology. The factors associated with the tool are the choice of tool material, the composition of the tool system, and the shape of the edge to be machined. Closely related to the technology is the choice of CAD / CAM system, the planning of the tool processing path, the setting of cutting parameters and the cooling and lubrication links.