Dual-Spindle Tool Head Balancing for Small-Diameter Gear Tools
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Solution Overview
Problem
Existing balancing systems for small diameter tools in gear cutting machines face challenges in achieving precise balancing due to limited space and increased unbalance forces at high rotational speeds, leading to reduced manufacturing accuracy and potential bearing damage.
Innovation Solution
A tool head design featuring coaxially arranged spindle units with balancing devices positioned radially around the spindle shafts and axially between the tool-side spindle bearings, allowing for efficient two-plane balancing and precise correction of unbalances, while also providing axial compression to enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If balancing devices are arranged inside the tool, then the tool structure is compact, but the available space for balancing elements is insufficient for small diameter tools
Solution Approach 1:
The balancing devices are relocated from the internal tool space to the external spindle shaft space, utilizing the radial dimension around the spindle shaft instead of the axial dimension inside the tool. This dimensional transition provides sufficient space for balancing elements while maintaining compatibility with small diameter tools.
Solution Approach 2:
The spindle shaft serves as an intermediary structure that hosts the balancing devices externally. By placing balancing devices on the spindle shaft rather than inside the tool, the system gains access to adequate balancing space without compromising the small tool diameter requirement.
2Stability of the object's composition
If balancing devices are integrated in the shafts of motor spindle and counter spindle, then the structure is stable, but the balancing devices are far away from the tool and bearing locations
Solution Approach 1:
Balancing devices with different characteristics are assigned to different locations: the first balancing device is positioned near the tool for effective unbalance correction, while the second balancing device is positioned near the bearing locations for bearing force reduction. This localized placement optimizes the specific function of each balancing device.
Solution Approach 2:
The balancing system is divided into two separate balancing devices positioned at different axial locations on the spindle shaft. This segmentation allows each device to specialize in a particular function - one for tool balancing and one for bearing protection - thereby achieving both high manufacturing precision and structural stability.
3Speed
If tools with small diameters are operated at high rotational speeds, then the desired cutting speed is achieved, but very high unbalance forces occur
Solution Approach 1:
The balancing devices generate counterweights that oppose the unbalance forces generated by the rotating tool. By positioning these balancing devices close to the tool and bearings, the counteracting forces are maximized, effectively reducing the harmful unbalance forces even at high rotational speeds.
Solution Approach 2:
The balancing devices continuously counteract unbalance forces before they can cause significant vibrations or bearing damage. This preliminary action of force cancellation allows the system to operate at high speeds without experiencing the full detrimental effects of unbalance.
Data Source
AI summary
A tool head for a gear cutting machine includes a first spindle unit having a first spindle shaft and a second spindle unit having a second spindle shaft. A tool is axially receivable between the first spindle shaft and the second spindle shaft. A balancing device is associated with each spindle unit. The balancing device radially surrounds the respective spindle shaft and is axially arranged between a tool-side spindle bearing of the corresponding spindle unit and the tool-side end of the corresponding spindle shaft. The tool is axially clamped between the two spindle shafts by a pull rod and a clamping element.