In the precision machining, various tools are installed on the CNC knife, and the knife selection and the position of the knife are carried out strictly in accordance with the requirements at any time and anywhere, so it is necessary to choose the standard toolholder, which is convenient to make the standard tools for drilling, boring, expanding, cutting and other processes quickly and accurately installed on the spindle of the lathe or the CNC knife, and the software programmer should master the construction specifications of the common toolholder on the CNC lathe, the adjustment mode and its adjustment scope, so as to facilitate The axial and radial specifications of the tool are clear when the program is written. In China, the most common use is BT40 and BT50 series toolholders and spigots.
Commonly used toolholders for precision machining centers: sharpening type toolholders, collet chuck toolholders, power chuck toolholders, face milling toolholders, triple-edge milling toolholders, flank type toolholders, Morse taper toolholders, drill chuck toolholders, tap chuck toolholders, and integral toolholders. No toolholder system software is foolproof. Toolholders designed for high speed precision machining processes generally lack the stiffness and compressive strength needed for high efficiency machining, such as rough machining of rough cast parts. Conversely, toolholders for rough machining typically lack the rotor balance that is needed to keep the toolholder stable at high speeds during deep machining processes.
In addition, the robust design and large size of roughing toolholders may limit their ability to reach more detailed or deeper part features. Hard-to-process materials must have shanks with increased compressive strength and stiffness. In addition, the ability of the toolholder to work with shock absorption and its ability to work with cryogenic fluid transport are also key selection criteria. The application of unsuitable toolholders can cause specification deviations and part destruction, as well as excessive damage to the lathe spindle, reduced tool life and increased risk of tool breakage. In non-critical work, an inexpensive toolholder may result in a more satisfactory outcome. However, in processes where repeatable precision is essential, especially when the destruction of expensive product parts reduces the gross margin of the part, a project investment in a high quality toolholder with a focus on utilization can prevent such unexpected damage at a lower cost.
