Carbide cutting tools industry trends.

With the progress of science and technology, we are in a rapid development period, advanced manufacturing technology application of cnc machine tools, greatly reduce the auxiliary time of parts processing, greatly improved productivity. When general aviation parts processing, shorten the auxiliary time, cutting accounted for the proportion of time increases accordingly, in order to further improve the productivity of machine tools, must increase cutting speed, this also is in recent decades the main reason for the rapid development of high speed cutting technology. High-speed machining the earliest light alloy is mainly used in the aviation industry, has now become a aviation manufacturing industry to improve processing efficiency and quality, the main way to reduce the processing cost.

In aviation parts processing, high speed cutting is a large number of applications, mainly has the following several reasons:

(1) in order to maximize the weight loss and meet other requirements, many of the artifacts, wall panels, "overall manufacturing method", namely remove allowance on large pieces of blank, the formation of thin wall, fine steel structural parts, need to remove a large number of metal materials, cutting time lead to take parts total production time proportion is very big, so one of the ways to improve productivity is to adopt the high-speed cutting processing.

(2) aircraft parts of complex structure, high accuracy, stiffness of thin-walled parts, thin steel structure is poor, try to reduce the radial cutting force and thermal deformation of machining, only using high-speed machining can meet these requirements.

(3) the difficult-to-machine materials, such as high temperature nickel base alloy, titanium alloy, high strength structural steel adopted by modern aviation products, the material strength, high hardness, impact resistance, easy processing of hardening, high cutting temperature and tool wear serious, belong to the hard processing material. Generally adopt the low cutting speed for processing, if the high speed cutting, not only can greatly improve the productivity and can effectively reduce the tool wear, improve the quality of the surface of the parts. High-speed machining is different from the traditional machining technology of machining mechanism and the application advantages, it is a conceptual change in nc machining process. According to the material and structure characteristics of aviation products, in order to realize high speed machining must be advanced in order to ensure the high speed cutting tools. High-speed cutting tools must have good wear resistance and high strength and toughness, advanced cutting tool materials, excellent geometric structure parameters of cutting tool coating technology, reasonable and highly dynamic balance system, safe and reliable way of clamping, as well as the high concentricity of the blade precision and so on.

The development direction of cutting tool materials and applications
At present, in the field of aircraft manufacturing, high speed steel cutting tools account for about 60% of the total amount of all kinds of cutting tool always, cemented carbide cutting tools account for about 35% of the total amount of cutting tool, superhard cutting tools (cubic boron nitride, diamond) accounted for less than 5% total all cutting tools and in the future, as the aviation new materials constantly emerging, the increase of hard cutting, dry cutting application, carbide cutting tools, coated tools, ceramic cutting tool, cubic boron nitride cutting tool and the proportion of polycrystalline diamond cutting tools will be greatly increased.

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Diamond single crystal and industrialization.

The development of large single crystal diamond is not enough for our country. Here consists of two aspects of content:

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Synthesis method of large particles diamond single crystal seed crystal; (2) the epitaxial growth method is adopted to develop large single crystal diamond. Synthesis method of large particles diamond single crystal seed crystal, although it has about 6 mm of big domestic single crystal, there are 10 mm or study plan, but it is rare in the market. While Japan's sumitomo corporation available synthetic diamond single crystal diamond tool adopted the larger particles.
Epitaxial growth method is used to develop large single crystal diamond, should cause our great attention. Some people think that the epitaxial growth cannot obtain diamond single crystal, but in natural crystal growth is a kind of phenomenon, starting with a lot of small crystal bud, grew up in a basement, crystal sprouts grow up step by step, gradually reduce the crystal quantity. We call this phenomenon "geometric elimination law", we can use this to explain the fact that may develop into single crystal diamond thin film.
Cubic boron nitride composite and its development of functional materials
The current domestic research and production of cubic boron nitride composite strength is quite weak, research institutes and universities are limited in several, is 1 ~ 2 production enterprises. The original thinking of cubic boron nitride should account for 25% ~ 30% of superhard material, after decades of development also accounted for only 5% ~ 5%, this is an unreasonable phenomenon. Not to mention its composite functional materials was developed.
A, cubic boron nitride composite sheet of restricted to henan an enterprise, its diameter is ф (30 ~ 35) mm, the technology will need to be further improved, especially the uniformity, stability, if can industrialization, as its development prospect will be considerable.
B, cubic boron nitride functional research domestic visible may simply be at jilin university. So far in the world with high temperature and high pressure method in laboratory under the condition of maximum size of the synthesis of cubic boron nitride single crystal is only 3 mm. Especially most of the growth of the crystal shape is irregular, unfit for device research applications. For this, the researchers conducted a functional device with high purity flake synthesis, cubic boron nitride single crystal is obtained nearly millimeter level surface with optical flatness, shape rules of high purity flake cubic boron nitride single crystal. As we have laid the foundation for the further study on its properties.
Cubic boron nitride crystal is a typical Ⅲ - V compound, its resistivity is 1010 Ω. Cm, 13 w/cm. The thermal conductivity K, can tolerate high temperature of 1200 ° C, and have the most wide direct band gap of 6.4 eV, so also is a kind of very important excellent semiconductor material, it in high temperature and high power broadband device microelectronics has a broad application prospect. Cubic boron nitride with sphalerite structure, belongs to the macroscopic symmetry F43m - Td group, also can have a second order nonlinear optical effect. It can be used to make optical higher harmonic generator, electro-optic modulator, visible and ultraviolet light converter, optical rectifier, optical parametric amplifier and so on. Cubic boron nitride as diamond still has a strong ability to resist radiation, to the preparation of radiation devices. Therefore, the preparation of cubic boron nitride materials research to the national economy in various fields, especially in the aerospace, military and other harsh environmental conditions application breakthrough device has important practical significance.
Due to the sheet, the synthesis of cubic boron nitride crystal provided can be used as the properties of crystal material, make us in the study of nature of cubic boron nitride is very apparent success. For example, with the development of lamellar cubic boron carbide, then can be obtained with diamond CVD method will cover up the ideal semiconductor devices. So the functional sex of the cubic boron nitride research becomes the more important!


From the above content, we have a lot of work needs to be done in superhard materials. We often say that the 21st century is the century of diamond, it is not only in the development and application of abrasive, more will be the development and utilization of functional. Our country has a good study atmosphere, with a large number of old and new combined with development of science and technology talents. We totally believe in the near future comprehensive catch up with and surpass the advanced world level.

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Look at the future development of cutting tool from the airline industry demand

Entering the 21st century, competition in the market driving machines technology as the forerunner of advanced manufacturing technology is developing at unprecedented speed, aviation parts and components manufacturing also has entered in the digital manufacturing technology for the development of the characteristics of The Times. Advanced aviation product requirements aviation parts has more excellent performance, lower cost and higher environmental protection, and machining process requirement has faster speed, higher reliability, high repeat precision and reproducibility. Traditional tool cannot meet the above requirements, cutting tool industry and entered the "high precision, high efficiency, high reliability and specialty" of the new pattern of modern cutlery production. High speed and high efficiency cutting with the progress of science and technology, we are in a rapid development period, advanced manufacturing technology application of nc machine tools, greatly reduce the auxiliary time of parts processing, greatly improved productivity. When general aviation parts processing, shorten the auxiliary time, cutting accounted for the proportion of time increases accordingly, in order to further improve the productivity of machine tools, must increase cutting speed, this also is in recent decades the main reason for the rapid development of high speed cutting technology. High-speed machining the earliest light alloy is mainly used in the aviation industry, has now become a aviation manufacturing industry to improve processing efficiency and quality, the main way to reduce the processing cost.

In aviation parts processing, high speed cutting is a large number of applications, mainly has the following several reasons:

(1) in order to maximize the weight loss and meet other requirements, many of the artifacts, wall panels, "overall manufacturing method", namely remove allowance on large pieces of blank, the formation of thin wall, fine steel structural parts, need to remove a large number of metal materials, cutting time lead to take parts total production time proportion is very big, so one of the ways to improve productivity is to adopt the high-speed cutting processing.

(2) aircraft parts of complex structure, high accuracy, stiffness of thin-walled parts, thin steel structure is poor, try to reduce the radial cutting force and thermal deformation of machining, only using high-speed machining can meet these requirements.

(3) the difficult-to-machine materials, such as high temperature nickel base alloy, titanium alloy, high strength structural steel adopted by modern aviation products, the material strength, high hardness, impact resistance, easy processing of hardening, high cutting temperature and tool wear serious, belong to the hard processing material. Generally adopt the low cutting speed for processing, if the high speed cutting, not only can greatly improve the productivity and can effectively reduce the tool wear, improve the quality of the surface of the parts. High-speed machining is different from the traditional machining technology of machining mechanism and the application advantages, it is a conceptual change in nc machining process. According to the material and structure characteristics of aviation products, in order to realize high speed machining must be advanced in order to ensure the high speed cutting tools. High-speed cutting tools must have good wear resistance and high strength and toughness, advanced cutting tool materials, excellent geometric structure parameters of cutting tool coating technology, reasonable and highly dynamic balance system, safe and reliable way of clamping, as well as the high concentricity of the blade precision and so on.

To be continued.

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