In modern manufacturing, the combination of turning centers and driven tool holders has brought about significant changes in machining processes. Turning centers are typically used for basic processes such as finishing the outer diameter, end faces, and drilling center holes of workpieces, while the introduction of driven tool holders has made complex machining such as milling, drilling, and tapping possible.
Driven tool holders are a key component of turning centers. They work in conjunction with the spindle's C-axis function to achieve multiple machining methods. The design of driven tool holders allows for multiple processes to be completed in a single clamping, ensuring the accuracy and production efficiency of the workpiece. They are particularly suitable for workpieces that require high precision and multifunctional processing, where turning takes a major role and milling is supplementary.
Variety of driven tool holders come in various types, including 0° (straight handle),90° (right angle), and special structural tool holders. According to the cooling method, driven tool holders can be divided into external cooling and internal cooling (central cooling), etc. Choosing the rightpowered tool holder can not only improve machining accuracy but also effectively extend the service life of the cutting tools.
The connection methods of driven tool holders are mainly divided into VDI (DIN69880) and BMT (Bolt-on). The VDI interface achieves quick change by engaging a dovetail with the serrations at the rear of the tool station, but has certain limitations in rigidity and repetitive positioning accuracy. The BMT interface, on the other hand, uses four bolts to fix the tool station, thereby offering higher rigidity and accuracy, suitable for high-load and complex machining requirements.
With the advancement of manufacturing technology, the application of star-shaped turrets is becoming more widespread. This new type of turret effectively overcomes interference issues of traditional disc turrets and can process larger diameter workpieces under the same disc diameter, meeting the ever-increasing market demands for machining capacity.
Despite driven tool holders showcasing numerous advantages in machining, they also face several challenges. For instance, the lack of rigidity and low repetitive positioning accuracy of driven tool holders lead to lengthy adjustment times during process conversion, thus reducing the utilization efficiency of machine tools. Additionally,driven tool holders usually can only use ER spring collets to hold tools, limiting the types of cutting tools and machining accuracy.
To address these issues, manypowered tool holder manufacturers are seeking improvement solutions, such as expanding the use range of driven tool holders to realize "multi-functionality in one station." By increasing clamping force, improving connection methods, and optimizing designs, the performance and applicability of driven tool holders can be enhanced.
In summary, turning centers and their driven tool holders play a crucial role in modern manufacturing. With ongoing technological advancements, the functions and applications ofdriven tool holders will become more extensive, providing stronger guarantees for the production efficiency and machining accuracy of factories.
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