Boring Bar Fluid Outlet Positioning for Chip Evacuation
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Solution Overview
Problem
Internal turning tools face challenges in chip evacuation and vibration control, especially when dealing with small, closed holes, as conventional designs often result in uncontrolled chip movement and reduced stiffness due to limited space for chip flutes and inserts.
Innovation Solution
The design positions the outlet mouth of the fluid supply channel far forward on the bar, opposite the turning insert and chip flute, allowing cooling liquid to flush chips towards the chip flute, ensuring controlled chip evacuation and maintaining bar stiffness by optimizing the cross-sectional area for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the bar diameter is made slightly less than the hole diameter to ensure stability and vibration-free operation, then the bar stiffness is improved, but the available annular space for chip evacuation is reduced to a minimum
Solution Approach 1:
The invention relocates the chip flute from a conventional position to the front end of the bar, utilizing the radial dimension at the very front of the tool. This allows the chip evacuation path to extend in a different spatial direction, creating effective chip clearance without increasing the bar's overall diameter or reducing its stiffness.
Solution Approach 2:
The chip flute is segmented into multiple sections along its length, with varying depths and orientations. This segmentation allows chips to be progressively guided and evacuated through different zones, preventing chip clogging in the limited annular space while maintaining bar structural integrity.
2Stability of the object's composition
If the bar length is limited to avoid strong vibrations, then the bar stiffness is improved, but the capability to machine deeper holes is reduced
Solution Approach 1:
The chip flute is nested within the bar's envelope surface, with its cross-section countersunk into the bar body. This nesting allows the chip evacuation feature to be integrated within the existing bar structure without adding external length or compromising the bar's overall stiffness and vibration characteristics.
3Object-generated harmful factors
If the chip flute is made external and countersunk in the envelope surface, then chip evacuation capability is improved, but the bar cross-sectional area available for stiffness is reduced
Solution Approach 1:
The chip flute cross-section varies along its length, with different depths and orientations optimized for specific zones. The flute is deeper near the cutting point where chips are generated, and shallower toward the rear, allowing effective chip evacuation while minimizing material removal and preserving bar stiffness in critical areas.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient and stable chip evacuation, maintaining excellent surface finish and dimension tolerances in small, closed holes while minimizing vibrations and simplifying insert mounting and dismounting processes.
Implementation Method 1
the fluid, usually being a cooling liquid, will pass along the topside of the turning insert toward the front opening of the chip flute, wherein the fluid will be flushed against the chips and exert a pressure thereon, so that they are compelled to move along with the liquid flow toward the chip flute
Data Source
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Figure 3
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AI summary
The invention relates to a boring bar intended for internal turning having a front pocket (7) that is delimited by a shelf-like surface (8) and a ramp surface (9); an insert seat (20) that is countersunk in the shelf surface (8) and displaced laterally in relation to a centre axis (C); a chip flute (6) that is countersunk in the outside of the bar, opens in the ramp surface (9) and is situated on the same side of the centre axis as the insert seat; as well as an internal channel for the supply of a fluid to the front part of the bar. According to the invention, the fluid channel ends in an outlet mouth (36) situated on the side of the bar that is opposite the insert seat (20) in order to guide a flow of the fluid past the insert seat toward the front opening of the chip flute (6).