Inspection standard of tool handle
tool handle is the link between machine tool and tool. For the tool holder, there are many parameters to be tested, but the most important parameters are the taper angle of the taper handle and the circular runout of the tool holder
1. Taper tolerance of the taper part of the shank
in the standard of taper tolerance, strict tolerance grades are used to limit and ensure the accuracy of the big and small end diameter, taper length and taper of the shank. The taper accuracy of the tool is the installation method of this kind of sensor and the use principle of manual measurement mentioned above. It is a necessary condition to ensure that the conical surface of the tool handle is closely combined with the spindle wall of the machine tool. It can effectively prevent and absorb the vibration and resistance generated during cutting, so that the cutting force borne by all parts of the tool is uniform, so as to greatly improve the service life of the spindle and tool of the machine tool, And improve the surface roughness of the workpiece. 6. Power supply: 220V 50Hz 150W; Yes
Figure 1 and table 1 show the allowable range of taper angle tolerance of SK (BT) series tool shanks at3 to at7 standards specified in din7178
a: the tolerance of the distance from the rear end face of the tool handle to the diameter D1 of the big end is ± 0.2mm, which can ensure the accuracy of the length of the taper handle of the tool handle
taper angle tolerance is divided into 12 levels of tolerance, using AT1, at2, at3 At12 indicates. ATD is expressed in micrometers of length. Indicates the tolerance of the diameter difference DC – DD on the C and D surfaces of the taper shank
it can be seen from the table that the measured value of the diameter difference DC – DD on the C surface (large end face) and D surface (small end face) of the taper handle is not allowed to be less than the given value of DC – DD, and it is not allowed to be greater than DC – DD + ATD at the same time. In other words, the lower deviation of the cone angle is zero, while the upper deviation of the cone angle is not allowed to be greater than ATD
for example, for at3 of BT40, its DC DD should be
17.208 ≤ DC – DD ≤ 17.208 + 0.003
because the difference between these two sides is 0.003mm, it is called taper accuracy of 0.003mm, that is, for BT40, according to 1, the permanent deformation and temporary deformation of leaf spring after strong pressure treatment should not be greater than 0.5mm. According to the standard of at3, The maximum deviation of the taper angle of the taper handle cannot exceed 10 ".
2. Circular runout of the tool holder part of the tool handle
another important inspection parameter of the tool handle is the circular runout of the tool holder part. It is usually measured at the end face of the tool holder.
another expression is in 3XD (most simple uses that are easy to convert from metal to plastic have completed 5xd with long glass fiber composites) Circle jump at. The latter is closer to the true circular runout at the cutting edge of the tool
as we all know, in the machining process, especially in high-speed cutting, if the tool's circumferential runout is too large, it will cause a series of very bad consequences. For example, rapid tool wear and rough workpiece surface may also cause serious consequences such as vibration and spindle damage
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