Replaceable Boring Bar Head With Offset Sleeve for Deep Boring
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Solution Overview
Problem
Existing boring bar arrangements face limitations in achieving high penetration depth with high cutting accuracy and low vibrations, as they often result in increased machining time due to stability and vibration issues.
Innovation Solution
A boring bar arrangement featuring a cylindrical reduction sleeve with a protruding hollow section and a clamping bolt, where the boring bar is secured as a replaceable head at the front end of the hollow section, allowing for improved stability and reduced vibrations through axial parallel alignment and a coaxial clamping mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the hollow-section wall is made thinner in the side region where the cutting tool protrudes, then the penetration depth increases and the hollow section can follow the cutting tool into the bore without collisions, but the stability and vibration resistance of the boring bar decreases
Solution Approach 1:
The hollow-section wall is designed with non-uniform thickness: thinner in the side region where the cutting tool protrudes to enable deeper penetration without collisions, and thicker in other regions to maintain overall structural stability and vibration resistance. This local differentiation of wall thickness optimizes both penetration capability and structural integrity.
2Ease of repair
If the boring bar is designed as a replaceable head secured at the front end of the hollow section, then the ease of replacement improves, but the stability and rigidity of the connection may be compromised
Solution Approach 1:
The replaceable boring bar head is pre-equipped with a female thread that engages with a clamping bolt. This preliminary threading arrangement enables quick replacement while maintaining stable connection during operation, as the threaded engagement provides reliable mechanical fastening before the replacement action occurs.
3Ease of operation
If a clamping bolt runs coaxially through the reduction sleeve and hollow section, then the ease of operation for securing and releasing the boring bar improves, but the device complexity increases
Solution Approach 1:
The clamping bolt is designed to run coaxially through both the reduction sleeve and the hollow section, combining the securing function for both components into a single fastening element. This merging of functions simplifies the operation of securing and releasing the boring bar, as one bolt simultaneously secures both components.
4Length of moving object
If the hollow section axis is arranged parallel to and at a distance from the reduction sleeve axis, then the penetration depth increases without collisions, but the manufacturing precision and alignment requirements increase
Solution Approach 1:
The hollow section is deliberately designed with its axis parallel to but offset from the reduction sleeve axis, creating an asymmetric arrangement. This asymmetric positioning allows the hollow section to follow the cutting tool into the bore at greater depths without collisions, while the parallel alignment maintains manageable manufacturing precision requirements.
Data Source
AI summary
A boring-bar arrangement includes a boring bar, a securing device, and a clamping bolt. The securing device has a reduction sleeve, which is secured in a tool chuck, which has a front end that faces away from the tool chuck and a protruding hollow section which receives the boring bar. The hollow section has a hollow-section interior, a hollow-section outer wall, and a hollow-section wall which is arranged therebetween. The hollow-section wall has a first thickness in a side region where the cutting tool protrudes from the boring bar which is less than a second thickness in a rest of the hollow-section wall. The boring bar is releasably secured as a replaceable head, via its back end, at a front end of the protruding hollow section. A front end of the clamping bolt has a male thread which sits in the female thread of the boring bar.