Cutting Tool Insert Extraction via Angled Passage Geometry
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Solution Overview
Problem
Existing cutting tools with resiliently clamped cutting inserts face challenges in securely holding and efficiently extracting the inserts, leading to potential misalignment and reduced tool effectiveness during grooving and parting operations.
Innovation Solution
A cutting tool design featuring a holder blade with a specific geometry, including opposing side surfaces and passages, and an extraction key with protrusions, allows for resilient clamping and controlled extraction of the cutting insert by forming a first angle less than or equal to 60° between the holder and insert passages, enabling precise clamping and easy removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resilient clamping mechanism is used to secure the cutting insert, then the cutting insert can be removably secured in the holder blade, but the extraction of the cutting insert becomes complex and requires additional keys and mechanisms
Solution Approach 1:
The holder blade is divided into distinct functional zones: a body portion and a holding portion with specific geometric features. The insert receiving slot is segmented into a clamping zone with opposing surfaces and an extraction zone with the recess, allowing independent optimization of clamping and extraction functions without interfering with each other.
Solution Approach 2:
The extraction function is extracted from the clamping mechanism. Instead of using a complex key system that interferes with clamping, the patent provides direct access to the insert's rear surface through the recess in the holding portion, allowing the insert to be pried out independently of the clamping mechanism.
2Force
If the holder passage centre point is located downwardly from the base jaw lower surface, then the clamping force magnitude is improved, but the alignment and positioning of the cutting insert becomes more difficult
Solution Approach 1:
The insert receiving slot is designed with predetermined geometric features including the recess and specific surface orientations that guide the insert into correct alignment before clamping occurs. The recess is positioned and dimensioned to receive the protrusion at the rear of the insert, pre-aligning it in the longitudinal direction before the clamping force is applied.
Solution Approach 2:
The patent replaces complex mechanical alignment mechanisms with geometric constraint surfaces. The opposing clamping surfaces and the recess create natural alignment through their geometry, eliminating the need for additional alignment fixtures or complex positioning mechanisms.
3Ease of operation
If the first angle between the passage plane and main plane is less than or equal to 60°, then the extraction of the cutting insert is facilitated, but the clamping stability is reduced
Solution Approach 1:
The patent introduces a vertical dimension to the extraction mechanism by providing the recess in the holding portion that extends downwardly from the base jaw lower surface. This allows the extraction key to engage the insert from below through the recess, providing an extraction path that is perpendicular to the clamping direction, thereby facilitating extraction without compromising clamping stability.
Solution Approach 2:
The recess acts as an intermediary feature that mediates between the clamping mechanism and the extraction operation. It provides a controlled access path for the extraction key to reach the insert's rear surface, allowing extraction force to be applied without interfering with the clamping surfaces or the holder blade's structural integrity.
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 provides improved clamping force magnitude and controlled extraction of the cutting insert, ensuring accurate positioning and efficient operation during cutting operations, reducing the risk of misalignment and enhancing tool performance.
Implementation Method 1
a cutting insert resiliently clamped in the holder blade
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A cutting tool (20,120) used for grooving and turning has a cutting insert (22,122) removably secured in a holder blade (24,124). The cutting insert (22,122) includes an insert passage (38) having an insert passage axis (Ax), and the holder blade (24, 124) includes a holder passage (66) having holder passage axis (Ah). When the cutting insert (22,122) is resiliently clamped in the holding portion (58) and located in a rearmost position, a passage plane (PI) containing the holder and insert passage axes (Ai,Ah) forms a first angle with a main plane (P2), perpendicular to the insert longitudinal axis (A) and containing the insert passage centre point (Ci), where the first angle is less than or equal to 60°. The cutting insert (22,122) can be extracted from the cutting tool (20,120) by positioning first and second engagement portions (82,84) of an extraction key (26) simultaneously in the holder and insert passages (38,66), respectively, and rotating the extraction key (26).