The tool handle is a key connecting component between a cutting tool and a machine tool spindle. If the tool handle is unqualified or fails due to wear, it will shorten the tool life, also lead to poor surface quality of the workpiece being processed, and may even damage the machine tool spindle.
Reasonable selection and use of tool handles is an economical and effective way to improve machine tool production efficiency, reduce downtime, and reduce the number of unqualified workpieces. Although the cost of tool handles accounts for only a small portion of processing costs, they have a significant impact on productivity and cost effectiveness.
Several types of unqualified tool handles:
-The taper and taper tolerance of the tool handle are unqualified, and the fit with the machine tool spindle is insufficient, resulting in excessive vibration.
-Excessive circular runout of the tool holder portion of the tool handle leads to rapid tool wear and rough workpiece surface.
-At 7:24, the forward tolerance of the large conical surface tool shank and the small conical surface is too large, resulting in a locking phenomenon between the tool shank pulled into the spindle and the spindle after high-speed machining, making it difficult to take out the tool shank, and even causing wear on the inner bore of the spindle.
Several typical forms of tool shank failure:
-The cutting chips wrap around the tool handle, causing wear on the tool handle due to friction between the tool handle, the workpiece, and the cutting chips.
-Intermittent cutting forces cause surface fatigue of the tool shank.
-Tool shank deformation caused by cutting forces.
-Cutting heat and cutting temperature lead to phase transformation of the material structure of the tool shank.
-Oxidation and corrosion of the handle.
-Wear of spare parts, fittings, and connecting surfaces.
-The overheating of the heat shrinkable tool handle during the heat shrinkable process leads to changes in the material structure of the tool handle.