How to choose the handle correctly and control the cost effectively

A large number of factors, such as dimensional accuracy, surface quality, changing time and tool wear, will be affected by different clamping methods. Therefore, the tool handle has a direct impact on the quality of the workpiece and processing costs. In cutting, the handle is the key interface between the tool and the machine tool. In each processing occasion, whether the correct tool handle is selected will affect many factors, such as: dimensional accuracy, surface quality, changing time and tool wear, which ultimately affects the quality and cost of the workpiece processed.

As there are different processing occasions, there is no one tool handle on the market can be suitable for all processing needs. Therefore, with the development of processing technology, SCHUNK has developed five different high-precision shank systems over the past thirty years. With these sets of tool handles, users can meet the needs of various cutting tasks. It is suitable for a comprehensive range of industries from electronic, watch and clock industry fine processing to metal cutting high speed processing (HPC/HSC); Both high value and high precision tool handle, and cheap and suitable for large cutting volume processing tool handle.

The clamping rotation accuracy determines the dimensional accuracy of the workpiece being processed

High-precision tool handles, such as TENDO static expansion and TRIBOS stress locking, are calibrated through a series of dynamic balances to achieve high gripping rotation accuracy, in addition to the high structural size guaranteed by manufacturing. This feature can not only improve the quality of the workpiece, but also greatly reduce the processing cost. The processing cost is obviously lower than the traditional processing cost, because the use of high precision shank prolongs the service life of the tool. The TENDO hydrostatic expansion clamping technology (FIG. 2) and TRIBOS Stress locking clamping technology (FIG. 3) can save up to 27 percent in costs compared to conventional tool handles due to reduced tool wear alone.

SCHUNK's high precision shank system has extremely high clamping rotation accuracy, allowing users to accurately control the workpiece at the time of use

Machining and achieve high dimensional accuracy. Although heat shrinkable shank and high precision spring shank can also achieve higher clamping rotation accuracy when leaving the factory, there are still differences due to the difference in clamping technology. The results show that the grip precision of the heat shrinkable shank will gradually lose due to the influence of thermal expansion. However, TENDO with static pressure oil chamber deformation or TRIBOS with material stress deformation clamping at room temperature can still maintain radial rotation runout no more than 0.003mm after multiple tool changes.

In terms of vibration damping, the values of SCHUNK's shank systems reflect an extremely wide range of adaptability. The TENDO static expansion shank and TRIBOS-R stress lock shank are particularly outstanding. The TENDO hydrostatic expansion tool holder holds the tool through the inside of the oil chamber in a symmetrical structure. The pressure is evenly distributed to each part of the oil chamber by tightening the pressure bolt with an Allen wrench. The inner wall of the oil chamber expands evenly and symmetrically towards the axis, thus clamping the tool. With each clamping and release, the compression bolt is fixed to the same position, ensuring the requirements of repeated clamping accuracy. Because the vibration damping of oil is greater than that of steel, the TENDO shank also has extremely high damping characteristics. Similarly, the TRIBOS-R type stress lock shank uses a cavity structure filled with plastic damping material, which also has similar damping characteristics, thus achieving extremely quiet machining effect. The SINO Universal shank has similar advantages due to its plastic lining.