Application of CNC high speed machining in aerospace product manufacturing (3)

3 high speed cutting tool material

Tool technology plays a very important role in the development of high-speed cutting technology. High-speed cutting tool materials and tool manufacturing techniques have undergone tremendous changes. Tool materials suitable for high-speed cutting are: PCBN cubic boron nitride tools, coated carbide tools, ceramic tools and superhard material tools.

4 high speed tool system

The tool holder is a key component of high-speed machining. Due to the high rotation speed of the tool, it has a high clamping technology for both machining accuracy and operational safety. Claim. The traditional tool holder and machine tool spindle are connected by 7:24 taper shank (BT, ISO). The traditional shank form and the tool clamping method of the spring chuck and screw can not meet the requirements of high speed machining. Therefore, the development of new high-speed tool systems has become an important part of improving high-speed cutting systems. In terms of the shank, Germany developed the HSK hollow short taper shank connection. The HSK short taper shank adopts a 1:10 taper. Its taper is shorter than the standard 7:24 taper shank, which can realize the flange end face and The simultaneous contact of the taper shank has high connection precision and rigidity. It can adopt the system technology of high-level balance and automatic balance of the spindle. It can guarantee the machining precision during high-speed machining, ensure high productivity, and is safe and reliable. At present, the ISO/DIS standard developed by the International Standardization Organizing Committee and the German DIN69893-1 HSK tool holder have become the mainstream of the company's high-speed cutting tool holder.

The status quo and problems of high speed cutting of CNC tools

1 Status of developing high-speed cutting tools in the domestic tool industry

In recent years, with the increasing demand for high-speed machining tools in the national aviation manufacturing industry, domestic tool manufacturers have carried out a series of research and development work on high-speed machining technology and high-speed machining tools, and have made certain progress. For example, the key enterprises in the tool industry, such as Chengdu Tool Research Institute, Chengliang Group Company, Shanghai Tool Factory Co., Ltd., have invested more in high-tech processing technology in the field of cemented carbide materials, coatings and tool processing. Initial results have been achieved, providing products and technology to aviation companies.

2 Problems in the high-speed cutting tools of Xikong Company

At present, more than 80% of the high-precision, high-efficiency and high-reliability cutting tool products and processing technologies required by the company in the manufacturing industry rely on imports. China's tool industry cannot meet the needs of high-speed machining of aviation products. The main reason is that there is a big gap between the R&D and innovation capabilities of China's tool industry compared with foreign countries.

(1) The development of cemented carbide grades as the main tool material has a large gap with foreign products, which affects the improvement of the overall cutting level. At present, only the performances of individual brands such as Zhuzhou Diamond Cutting Tool Co., Ltd. and Chengdu Tool Research Institute are close to those of foreign products, and the speed of innovation and upgrade of new grades is slow, which makes China's large-scale cutting machining level of general machining industry. It is generally in a state of low speed and inefficiency.

(2) In terms of coating technology, in addition to the development of coating technology and equipment by Chengdu Tool Research Institute, China lacks basic theoretical research and lacks application technology and equipment development. The industry basically adopts equipment and introduces technology. one way.

(3) In terms of tool structure innovation, it is basically blank. At the international machine tool exhibition, it is difficult to find China's original tool products. The reason is that the main body of China's tool industry is still in the mode of producing traditional standard tools, and the output of general standard tools still accounts for the vast majority of major tool companies.

The backwardness of cutting technology and cutting tools in China is also reflected in the structure of China's tool industry. In China, only a few tool companies have two core technologies, namely hard alloy tool materials and coatings. Most tool factories lack cemented carbide materials. The core technology of some of the tool factories, although the introduction of coating equipment, but does not have the ability to develop, restricting the tool company to further enlarge and become stronger.

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