Boring Bar Sleeve Geometry for Deep Cavity Clearance and Rigidity
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Solution Overview
Problem
Existing devices for fixing boring bars on material-removing machines lack sufficient clearance between the cavity inner wall and the hollow profile, preventing the boring of deep and narrow cavities without collision, leading to inefficiencies in machining.
Innovation Solution
A cylindrical reducing sleeve with a hollow profile that has a varying wall thickness, where the thickness is reduced near the cutting tool to create a larger clearance, allowing the boring bar to stabilize and penetrate deeper without collision, and enabling higher rigidity and adjustable length for better machining results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the hollow profile has a uniform wall thickness, then the structure is simple and easy to manufacture, but the clearance between the cavity inner wall and hollow profile is insufficient, preventing deep and narrow cavities from being bored without collision
Solution Approach 1:
The hollow profile wall thickness is varied locally: thinner in the region corresponding to the cutting tool projection to increase clearance and prevent collision, and thicker in other regions to maintain structural stability and rigidity. This local quality variation resolves the contradiction between needing sufficient clearance and maintaining structural integrity.
2Length of moving object
If the hollow profile wall is made thinner to increase clearance, then deeper and narrower bores can be accessed, but the rigidity and stability of the boring bar system decreases
Solution Approach 1:
The wall thickness is optimized locally: thinner only where needed for clearance (at the cutting tool projection region) while maintaining adequate thickness elsewhere to preserve overall structural rigidity and stability.
Solution Approach 2:
The hollow profile is effectively segmented into regions of different wall thicknesses, allowing each region to be optimized for its specific function: clearance provision versus structural support.
3Strength
If a thicker boring bar is used to maintain rigidity, then stability and machining precision improve, but the ability to penetrate deep and narrow bores is reduced due to insufficient clearance
Solution Approach 1:
The hollow profile wall thickness is locally reduced only in the region corresponding to the cutting tool projection, allowing sufficient clearance for deep and narrow bores while maintaining adequate thickness in other regions to preserve the rigidity and stability of the overall boring bar system.
Data Source
AI summary
A fixing device for fixing a boring bar on a material-removing machine includes a reducing sleeve with a hollow profile arranged on a front face which faces away from a machine chuck. The boring bar is received in an interior of the hollow profile. An end region of the boring bar projects from the hollow profile and carries a cutting tool. The hollow profile has a wall arranged between the interior and an exterior of the hollow profile. The wall has a first thickness and a second thickness. The first thickness is less than the second thickness. The first thickness is established at a side of the fixing device where the cutting tool projects radially from the boring bar. A longitudinal axis of the hollow profile is parallel to and at a distance from the axis of the reducing sleeve which is coaxial with the interior of the boring bar.