3. superhard tool widely used tool materials <br> <br> changed a lot, CBN (cubic boron nitride), PCD (polycrystalline diamond), ceramic knives and other superhard tool has been applied widely. Due to its extremely high hardness, PCD tools have a very high service life when processing aluminum workpieces and other non-ferrous metals and their alloys. In recent years, with the large application of lightweight materials (such as aluminum alloys, composite materials, plastics, etc.) in the automotive industry, the application of PCD tools has also increased significantly. Nowadays, many parts of the cylinder block, cylinder head, gearbox housing, valve body, groove body and side cover of the automobile engine are made of aluminum. The machining of these parts uses a large number of PCD tools, which achieves very good results. The life of the knife is about thousands of pieces of workpiece, and the length can reach 1.5 to 20,000 pieces.
The CBN insert is characterized by extremely high hardness (after diamond), especially its red hardness. It can maintain its hardness and good cutting performance at over 1000 degrees, adapt to the needs of high-speed cutting, and also meet the needs. Some high-hardness and difficult-to-machine parts need to be processed, and have good application effects in the processing of powder metallurgy parts such as engine parts such as cast iron parts and valve seats. For example, CBN inserts are used in the machining of cylinder bores in semi-finished and fine-finished processes. The cutting speed can reach 800m/min, and the tool life is more than double that of cemented carbide tools. In the machining of the cylinder head joint surface of the cylinder block, the cutting speed of the CBN milling cutter can reach 1200m/min or more, the high can even reach 2000m/min, and the feed speed can reach 1000-2000mm/min.
At present, auto parts manufacturers have reduced the amount of equipment in the production line and reduced the number of equipment in the production line. At the same time, they hope to ensure the production cycle, and use a machining center with high-speed machining capability to significantly increase the cutting amount. A high-speed cutting CBN tool. For example, in the machining of in-line four-cylinder engine blocks, almost all faces are milled using CBN tools. Although CBN tools are more expensive, considering their improvement in machining efficiency and investment cost savings, It is still very economical to calculate. In the processing of the gearbox housing, Shanghai General Motors changed the original carbide boring tool to PCD tool, and the tool life increased from 3,000 to 70,000. The economic benefits are very obvious.
CBN tools can be used to machine hardened workpieces, so that it can be used for grinding. For example, Daewoo Motor Co., Ltd. uses CBN tools for machining the shaft on the input and output shaft of the gearbox instead of the original grinding wheel. Grinding process performed.
As a new type of tool in high-hard material tools, ceramic tools are also a tool worthy of attention and expanding in the field of application. The defects of ceramic tools are being improved. Now there are toughened ceramic tools. For rough machining of cast iron workpieces, such as in the rough machining of cylinder bores of engine cylinders, whether it is a V-type 6-cylinder engine or an in-line 4-cylinder engine, ceramic tools are used for rough machining of cylinder bores, which significantly improves the machining efficiency. The cutting line speed of the pupil can reach 700-800 m/min.
4. Coating technology and coating tools continue to develop
With the development of surface engineering and tribology, coating technology has developed rapidly in the past decade, and the technology and equipment are more and more mature. The application on the tool is more and more extensive, the effect is obvious, and the more More and more new coatings have been developed.
At present, more coatings are used on the tools used in the automobile industry, such as TiN, TiC, TiCN, TiAlN, ZrCN, etc., and the application results are well obtained on the drill bit, the reamer, the gear hob and the tap, and the tool life is obviously improved. Almost 75% of the tools used in the automotive industry are now coated, and as the regrind requirements increase, more and more regrind tools need to be recoated to make the coating Applications have a broader perspective. At the same time, how to make the re-coated tool after grinding to reach the performance level of the original new tool, it is also necessary for the coating manufacturer and the coating tool user to make greater efforts together. Since a single coating material is difficult to meet the requirements for improving the overall performance of the tool, the coating composition will tend to be diversified and composite. In composite coatings, the thickness of each individual component coating will become thinner and thinner and will gradually become nano-sized. The coating process will be more targeted to meet different cutting requirements. At present, the coating industry is still doing more work to further improve the performance of various coatings, such as combining multi-arc and sputtering processes, optimizing the structure of the coating, and developing multilayer coatings to improve toughness and bonding. Force, adding other alloying elements such as chromium, zirconium, vanadium, boron, niobium and silicon to further improve the properties of toughness and chemical stability, and at the same time strive to develop nano-multilayer coatings.
Previous Next
DQOK drinking water faucet is made of low lead brass and stainless steel, which can filter out most of the water and make your drinking water healthier. We only make high-quality healthy drinking water faucet
Drinking Water Faucet,Brass Drinking Water Faucet,Drinking Water Tap
Heshan Dingquan Sanitary Ware Industry Co., Ltd , https://www.dqoksanitary.com