Cutting Insert Assembly Internal Coolant Delivery
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Solution Overview
Problem
Conventional metal cutting systems face issues with excessive heat at the insert-chip interface, leading to reduced tool life, chip welding, and re-cutting, which decrease production efficiency and increase operating costs.
Innovation Solution
A cutting assembly with a holder and locking pin that includes a coolant delivery passage and a radial coolant trough oriented towards the corner cutting edge region, facilitating direct coolant delivery to the insert-chip interface through a diverter channel and bowl, enhancing cooling and chip removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external nozzles are used to direct coolant at the cutting edge from a distance of one to twelve inches, then the coolant can reach the cutting area, but the coolant mixes with air during travel and fails to effectively contact the tool-chip interface
Solution Approach 1:
The patent introduces an intermediary coolant delivery system consisting of a holder with internal coolant passages and a nozzle positioned adjacent to the cutting insert. This intermediary structure channels coolant directly to the tool-chip interface without exposure to air, ensuring reliable and effective coolant delivery while maintaining low temperatures at the cutting edge
Solution Approach 2:
The patent transitions from external coolant delivery (one-dimensional approach from above) to internal coolant delivery through the holder structure. The coolant is delivered from multiple directions including through the holder body and along the flanks of the insert, creating a multi-dimensional coolant delivery system that ensures comprehensive cooling at the tool-chip interface
2Device complexity
If coolant is delivered from a distance, then the system structure is simple, but the coolant mixes with air and fails to contact the tool-chip interface effectively
Solution Approach 1:
The patent merges the coolant delivery function with the tool holder structure itself. The holder incorporates internal coolant passages that integrate with the cutting insert positioning system, combining structural support and coolant delivery into a single unified component. This reduces overall system complexity while ensuring effective coolant delivery to the tool-chip interface
3Reliability
If no coolant delivery system is used, then the device structure is simple, but excessive heat causes chip welding and re-cutting, reducing tool life and production efficiency
Solution Approach 1:
The patent implements a self-service coolant delivery system where the holder automatically channels coolant to the cutting zone through its internal passages. The system uses the natural flow of coolant under pressure to deliver cooling directly to the tool-chip interface without requiring external adjustment or complex control mechanisms, thereby extending tool life through reliable cooling while maintaining reasonable system complexity
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
The solution effectively reduces excessive heat at the insert-chip interface, preventing chip welding and re-cutting, thereby extending tool life and improving production efficiency by ensuring efficient coolant delivery and chip evacuation.
Implementation Method 1
A flow of coolant to the insert-chip interface will reduce the potential for such welding
Implementation Method 2
The nozzles are often a distance of one to twelve inches away from the cutting edge. This is too far of a distance for effective cooling. The farther the coolant must travel, the more the coolant will mix with air and the less likely it will be to contact the tool-chip interface
Data Source
AI summary
A cutting assembly that is useful in an operation for chipforming removal of material from a workpiece. The cutting assembly includes a holder having a seat and containing a coolant delivery passage. A locking pin, which has a longitudinal locking pin bore, is affixed to the seat so the longitudinal locking pin bore is in communication with the coolant delivery passage. A cutting insert has a rake surface, a corner cutting edge region, a central cutting insert aperture, and a radial coolant trough with an orientation toward the corner cutting edge region. At least a portion of the locking pin is within the central cutting insert aperture. A clamp assembly attaches to the holder and engages the cutting insert. The clamp assembly has a diverter plate, which has a bottom surface defining a diverter bowl and a diverter channel. The longitudinal locking pin bore opening to the diverter plate whereby coolant flows into the diverter bowl and through the diverter channel into the radial coolant trough toward the corner cutting edge region.