Broaching Tool Holder With Lateral Coolant Flow at the Cutting Insert
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing broaching tools face challenges in providing adequate and reliable cooling and lubrication, especially when machining internal slots, as external coolant supply methods often fail to effectively reach the machining point, and internal coolant systems are inadequate.
Innovation Solution
A broaching tool with a holder featuring a coolant channel and lateral exit openings adjacent to a support structure, ensuring coolant directly impinges the cutting insert from the sides, thereby ensuring reliable cooling and lubrication throughout the machining process, including at the start of the bore and for long processing depths, and targeting specific areas like cutting edges and flanks for enhanced effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external coolant supply via hoses and lines is used, then the coolant supply system is simple, but the coolant cannot adequately reach the machining point when broaching internal slots
Solution Approach 1:
The coolant channel is nested inside the holder body, with the coolant flow path integrated into the holder structure. The holder contains an internal coolant channel that delivers coolant directly to the cutting insert location, eliminating the need for external hoses and lines while ensuring reliable coolant delivery to the machining point.
Solution Approach 2:
The holder acts as an intermediary carrier that transports coolant from the external supply to the cutting insert. The holder contains an internal coolant channel that delivers coolant directly to the cutting insert location, ensuring reliable coolant delivery while maintaining system simplicity.
2Reliability
If coolant exit openings are positioned far from the cutting insert, then the holder structure is simpler, but the coolant cannot reliably impinge the machining point
Solution Approach 1:
The coolant exit openings are positioned locally adjacent to the support and cutting insert, creating a localized high-concentration coolant delivery zone. This local positioning ensures that coolant directly impinges the machining point and cutting insert, providing reliable cooling and lubrication exactly where needed, rather than relying on long-distance coolant travel.
3Reliability
If coolant exits from the holder without lateral directionality, then the coolant channel is simpler, but chips can block the coolant path to the machining point
Solution Approach 1:
The coolant delivery is transitioned from a longitudinal path (along the holder axis) to a lateral path (perpendicular to the holder axis). The lateral exit openings positioned adjacent to the support deliver coolant from the side, creating a three-dimensional coolant delivery approach that bypasses the chip-prone longitudinal path between the machining point and traditional exit openings.
4Reliability
If the cutting edge is fully enclosed in the holder, then the holder structure is more robust, but the cutting edge cannot be effectively cooled and lubricated
Solution Approach 1:
The cutting edge is extracted from full enclosure within the holder by positioning the seat such that the cutting edge projects beyond the circumferential surface of the holding region. This partial extraction allows lateral coolant flow to directly impinge the cutting edge and flanks, providing effective cooling and lubrication while maintaining holder robustness through the integrated support structure.
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 design ensures precise and reliable cooling and lubrication of the cutting insert, reducing wear and extending its lifespan by directly impinging the machining point with coolant, even at the beginning of the process and for extended depths, and specifically targeting auxiliary cutting edges and corners for improved performance.
Implementation Method 1
a coolant channel extends inside the holder, wherein the coolant channel comprises two lateral exit openings which, as seen in a circumferential direction of the holder, are arranged laterally adjacent to the support and/or in lateral surfaces of the support
Implementation Method 2
the guidance of the coolant through the coolant channel is configured such that it exits laterally adjacent to and/or at the support, i.e. in the immediate vicinity of the cutting insert. It is thus ensured, on the one hand, that the coolant does not have to cover a long distance to the machining point after exiting from the exiting openings, and therefore reliably impinges the cutting insert
Implementation Method 3
Cooling and lubrication of the machining process is also important when broaching
Data Source
AI summary
Broaching tool comprising a cutting insert having a cutting edge and a holder for holding the cutting insert. The holder has a clamping region and a holding region, wherein the holding region comprises, at its end facing away from the clamping region, a seat for the cutting insert, which is configured and arranged such that, when the cutting insert is mounted in the seat, its cutting edge projects beyond the circumferential surface of the holding region. The holding region furthermore comprises, on its circumferential surface, a support for the cutting insert. A coolant channel extends into the inside of the holder, which coolant channel comprises two exit openings which, as seen in the circumferential direction, are arranged laterally adjacent to the support and/or in lateral surfaces of the support.