Recessed Coolant Tool Holder for Precision Turning Near the Chuck
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Solution Overview
Problem
Conventional cutting tool holders with protruding coolant ejection ports hinder precise processing by maintaining the cutting tool further away from the spindle head or chuck, leading to potential runout issues during high-precision finishing of small-diameter shafts, which decreases processing efficiency.
Innovation Solution
A cutting tool holder design with a recessed lateral flank surface and ejection ports positioned on a frontward-facing surface within the recess, eliminating the need for protruding portions, allowing closer placement to the spindle head or chuck while ensuring coolant supply to the cutting edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protruding portion is provided at the lateral flank side of the cutting tool holder to position the ejection port, then coolant supply to the cutting edge is ensured, but the cutting tool cannot be placed close to the spindle head or chuck, causing runout in precision processing
Solution Approach 1:
Instead of making the ejection port protrude outward from the lateral flank, the patent inverts the design by recessing the ejection port into the lateral flank surface. This allows the cutting tool holder to be positioned closer to the spindle head or chuck without the protruding portion interfering, thereby eliminating runout issues in precision processing while still ensuring reliable coolant supply to the cutting edge through the recessed ejection port configuration
2Manufacturing precision
If the cutting tool is positioned close to the spindle head or chuck for high-precision processing, then runout is prevented, but coolant supply to the cutting edge becomes difficult without a protruding ejection port
Solution Approach 1:
The patent transitions the ejection port from a protruding structure extending in the radial direction to a recessed structure within the lateral flank surface. This dimensional change allows the cutting tool holder to be positioned closer to the spindle head or chuck for high-precision processing while the recessed ejection port maintains coolant supply reliability by directing coolant flow toward the cutting edge through the recessed configuration
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 configuration reduces runout risks and enhances processing precision and efficiency by allowing the cutting tool to be positioned closer to the spindle head or chuck, even for small-diameter components, while maintaining effective coolant supply and swarf management.
Implementation Method 1
supply a coolant (a cutting fluid, etc.) fed under pressure within the flow path, as a high-pressure jet flow toward a rake face etc. forming the cutting edge
Implementation Method 2
cooling of the cutting edge (knife edge) and a to-be cut object (temperature rise prevention) by the coolant
Implementation Method 3
the effect of lubrication is high
Implementation Method 4
an effect of blowing swarf at the lateral flank side is also obtained
Data Source
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AI summary
[Object] To provide a cutting tool holder that allows a coolant to be supplied from a lateral flank side of a cutting tip toward a cutting edge, without providing a protruding portion at a lateral flank side of the cutting tool holder as in the conventional art. [Solution] A recess surface portion 123 is formed in a predetermined range L1 from a front end 103 toward a rear end, of a lateral flank 120 of a front end portion 102 of a holder 100, so as to be recessed relative to a lateral flank 120b of a rear portion 122, a circular arc surface portion (frontward-facing surface) 125 formed in a circular arc shape as seen from a rake face 105 side is provided on the rear of the recess surface portion 123, and an ejection port 150 is opened in the frontward-facing surface. Accordingly, supply of the coolant at the lateral flank side is ensured, and cutting can be performed at a position closer to a chuck Ck due to no protruding portion being present at the lateral flank side of the holder as in the conventional art.