Monobloc Whirling Tool for Precise Threading and Chip Flow
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Solution Overview
Problem
Existing thread whirling tools face challenges in maintaining high-precision concentricity and changeover accuracy due to multiple joints, which affect geometrical accuracy and surface quality, and lack efficient chip removal and cooling medium supply, especially in processes like thread whirling of bone screws.
Innovation Solution
A monobloc whirling tool with a one-piece design featuring internal cutting teeth, a conical lock for direct attachment to the drive spindle, and radial/axial sealing, along with integrated cooling channels, allowing for automatic tool change and improved chip flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple joints (inserts, carriers, holders) are used in traditional whirling tools, then the tool can be assembled and maintained, but the concentricity and changeover accuracy deteriorate due to cumulative tolerance deviations
Solution Approach 1:
The patent merges multiple separate components (inserts, carriers, holders) into a single monobloc tool structure. The cutting teeth are integrated directly into the tool body, eliminating the need for separate insert carriers and multiple assembly joints. This integration directly reduces cumulative tolerance deviations and improves concentricity between the cutting edges and the tool axis.
2Manufacturing precision
If multiple joints and separate components are used, then the tool can be assembled, but the geometrical accuracy and surface quality worsen due to tolerance accumulation
Solution Approach 1:
The monobloc design integrates all cutting teeth and structural elements into a single machined component, eliminating multiple assembly joints. This ensures that the geometrical accuracy is determined by a single manufacturing process rather than by cumulative tolerances from multiple assembled parts, significantly improving thread profile accuracy and surface quality.
3Productivity
If traditional multi-component tools are used, then assembly is possible, but chip removal efficiency deteriorates due to restricted chip flow paths
Solution Approach 1:
The integrated monobloc structure allows for optimized, uninterrupted chip flow paths from the cutting edges directly to the tool periphery. Without intermediate carriers and holders, chips can be evacuated more efficiently, reducing tool wear and improving productivity.
4Temperature
If traditional multi-component tools are used, then assembly is possible, but cooling medium supply deteriorates due to complex internal routing requirements
Solution Approach 1:
The monobloc design simplifies the internal structure, allowing cooling channels to be directly integrated into the tool body with straightforward routing from the coolant supply to the cutting edges. This eliminates the need for complex internal routing through multiple separate components, improving cooling efficiency.
Data Source
AI summary
A whirling tool (21), in particular for cutting a thread, includes a body with cutting teeth integrally machined thereon (23; 47, 51). Inaccuracies caused by mounting cutting teeth on the tool are avoided thereby.