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| Analysis and introduction of special alloy cutting tools |
| 阅读： 0次 Posted by: 2014-1-9 16 : 47 : 44Read : 0 times |
In the next five years, the special alloy tool profession will usher in a period of rapid development, and China's tool profession is facing a period of transition from low-end products to high-end products. Automobile, mold, aerospace and other occupations of high, fine, sharp and cluttered tools will be China's primary production direction of modern and efficient tools. The production of modern high-end cutting tools will be a highlight of professional production, and it will be one of the important codes for China's cutting tool companies to enter global shopping malls in the future.
The cutting of special alloy tools is not only scattered on the tool itself, but also closely related to the use of the machine tool, the connection between the tool and the machine tool, the tool shank system, the dynamic balance of the tool, and the tool safety monitoring system. The skills associated with the tool are also related to the tool. With the advancement of science and technology, new skills have been developed.
First, the high-speed cutting tool shank system and other CNC machine tools have always used the traditional 7:24 solid tapered shank system, because this type of shank only depends on the conical surface, the rigidity of the connection between the shank and the spindle is low, and the spindle When the speed exceeds 10000r / min, the lack of coupling rigidity is more significant. For the selection of ATC shank tool change, the radial dimension of the tool may change after each tool change, and there is a problem of low repeated positioning accuracy. To deal with these problems, the standard 7:24 tool holder was first improved. Inspired by HSK holders, these years have presented a new connection skill of 7:24 holders. For example, Japan Today Research Corporation and Great Showa Corporation have separately developed three touch (3LOCKSYSTEM) and two-sided (BIGPLUS) 7: 24 joint tool holder. Compared with the standard 7:24 tool holders, they have higher joint rigidity and accuracy, can be used for high-speed and efficient cutting, and are also compatible with existing 7:24 tool holders or machine tools. It is the future of 7:24 tool holders. In the development direction, in addition to the transformation of the standard 7:24 tool holder layout, the new HSK and KM tool holders were mainly selected at the time.
HSK tool holder is a new type of high-speed tapered special alloy tool holder. Its interface uses the method of positioning the tapered surface and the end surface 2 sides together. And high-speed, because the use of end-face positioning, completely eliminates the axial positioning errors, making high-speed, high-precision machining possible is also our domestic production plant tool development direction. The joint skills of high-speed tools and spindles will continue to be developed in the future following technological progress, which will further improve and perfect some new concept tool holders-HSK, KM, 3LOCK, BIGPLUS and other tool holders. At that time, the development direction of the spindle and tool connection skills was:
(1) Select the double-sided positioning system;
(2) High clamping accuracy, good clamping rigidity and compact layout;
(3) Tool holder with balance and vibration damping equipment;
(4) Develop multi-functional and intelligent tool holders.
Second, the tool dynamic balancing skills also have problems with balancing and safety for high-speed rotating tools. In the high-speed spindle system, any unbalance of the rotating body will cause centrifugal force. The centrifugal force of the unbalanced tool or tool holder during high-speed cutting makes the machine tool. Occurrence of oscillation, the small imbalance of the rotating tool will form a large centrifugal force during high-speed cutting, and the irregular cutting force generated by the tool imbalance will cause irregular wear. The results will affect the machining accuracy and surface of the workpiece. Quality, on the other hand, will affect the service life of spindle bearings and tools, and more importantly, the safety of high-speed cutting. Therefore, high-speed cutting requires careful tool balancing.
At that time, foreign companies developed special tool dynamic balancers based on the needs of tool dynamic balance. HAIMER in Germany and CEMB in Italy introduced vertical tool dynamic balancers, which can complete automatic tool dynamic balance measurement. The development direction of the new dynamic balance measuring instrument is accurate and efficient measurement, convenient operation and powerful functions.
Third, the development of cutting edge passivation At that time, most of the imported tools or indexable blades imported foreign cutting edge passivation. After passivation, the micro defects of the cutting edge of the tool or blade are completely removed, which effectively increases the strength of the cutting edge. The durability of the tool can usually be improved by 20% to double. At that time, only a few companies such as Xiamen Jinlu Special Alloy Co., Ltd. The cutting edge of the tool has been passivated, while most other tools have not been passivated. The durability is low and the cost of the tool is high. Therefore, the passivation of the cutting edge of the tool was one of the development directions of cutting tools in China at that time.