What requirements should high-speed tool holder meet in high-speed cutting?
August 01, 2019
1. System accuracy:
The accuracy of the system includes the accuracy of positioning and clamping of the system and the accuracy of repeated positioning of the tool. The former refers to the accuracy of the connection between the tool and the tool handle, and between the tool handle and the spindle of the machine tool; the latter refers to the consistency of the accuracy of the tool system after each tool change. The tool system has high system precision, so that the static and dynamic stability of the tool system can be guaranteed under the condition of high-speed machining. GER high-speed tool holder is equipped with 3-um barrel clamp, and its runout precision is less than 5 um. The clamping range of tool holder is integer, that is ER20-6N (5-6), and the clamping diameter must be 6, not decimal (such as 5.3), while ER elastic tool holder can be clamped within 5-6. Because the deformation of barrel clamp of tool holder is small, it can achieve repeated clamping precision. The utility model has the characteristics of high degree, long service life of the cylinder clamp, etc.
2. System stiffness: The static and dynamic stiffness of the tool system is an important factor affecting the machining accuracy and cutting performance. Insufficient stiffness of the tool system will lead to vibration of the tool system, which will reduce the machining accuracy, worsen the tool wear and reduce the service life of the tool. GER high-speed tool holder is made of special material. After processing, the hardness is between 58 and 60 degrees, which is close to the hardness of the spindle. The wear resistance is strengthened. Under conventional heat treatment, the ultra-cryogenic treatment of -196 degrees is added. The taper strictly complies with AT3 standard, and the fitting surface is over 90%.
3. Dynamic balance: Under the condition of high-speed cutting, the imbalance of micro-mass will cause huge centrifugal force, which will cause the sharp vibration of machine tools in the process of machining. Therefore, the dynamic balance of high-speed tool system is very important. The maximum value of BT-GER tool holder G2.5 can reach 30,000 RPM, and HSK-GER tool holder G2.5 can reach 40,000 RPM.
4. Clamping force: The size and accuracy of the clamping force between the tool handle and the tool also play an important role in high-speed cutting. If the tool holder is not firm enough to hold the tool, the machining accuracy will be reduced slightly, and the tool and workpiece will be damaged seriously, even causing safety accidents. In order to improve the clamping accuracy of the tool system, we must try to make the tool get precise and reliable positioning, ensure enough clamping force, strictly control and improve the accuracy of the tool system, increase the clamping length, optimize the structure design and reasonable material selection. In order to solve the problem of clamping force, the GER full-circle nut is designed and developed for GER high-speed tool shank. The nut is made of special material, processed by special technology, and designed with T-shaped screw. The self-adaptive positioning before and after the design plays a role of positioning and guiding, protects threaded teeth, is convenient, practical and has high clamping precision. 0%. Avoid dropping the knife. The nut not only has obtained the national technical patent, but also has been widely praised in the industry application. .
5. Surface quality: Under the same conditions, when the cutting speed increases to a certain value, the surface roughness decreases with the increase of cutting speed. Thus excellent surface quality can be obtained.
High-speed cutting technology is a new and developing advanced practical technology, which has been widely used in industrial developed countries and has achieved tremendous economic and social benefits. In our country, the development and application of high-speed cutting technology is in the preliminary stage, but a large number of high-speed processing equipment have been imported, and a variety of high-speed machine tools and processing centers have been developed. There are also many tool enterprises that can supply high-speed cutting tool systems. As long as we fully understand the advantages of high-speed cutting technology and the potential economic benefits, we can quickly promote the application of high-speed cutting technology to a new level, optimize manufacturing costs, and enhance the competitiveness of enterprises'products.
