The principle of heat shrinkable tool holders is to use the difference in the thermal expansion coefficient between the tool holder (special tool steel) and the tool (cemented carbide or high-speed steel) to effectively and accurately clamp the tool. Precision of heat shrinkable tool shank<3 μ m. The accuracy is no less than that of the hydraulic tool handle. The installation of heat shrinkable tool handles generally requires the use of a heat shrinkable machine. Currently, the commonly used heat shrinkable machine is an electromagnetic induction heat shrinkable machine.
Using an electromagnetic induction heat shrinking machine to heat the heat shrinking knife handle allows easy installation based on the specifications of the corresponding clamping stop plate, which is mainly used to determine the heating position of the knife handle based on the clamping diameter.
During heating, the temperature MAX in the area where the tool shank faces the induction coil is high, and heat is conducted up and down simultaneously to the tool shank. When the tool shank expands (the expansion amount is usually about 3 ‰ - 5 ‰ of the clamping diameter), the tool is installed. During installation, it can be used together with the tool shank overhang length adjustment device, and then cooled to complete tool installation.
It should be noted that although the heat shrinking machine will be equipped with a manual heating mode, it is recommended to use the automatic heating program of the heat shrinking machine as much as possible if there is no very good control over the temperature (different tool shank suppliers adjust the heating parameters and store them after fine tuning). When using manual heating, due to the difference in heat transfer time between the tool shank end face and the sensing position (0.5-1s), when the tool shank end face reaches the temperature expansion, the sensor coil tool shank area actually overheats, Frequent temperatures exceeding 500 ° C will affect the service life of the heat shrinkable tool shank.