Triangular Turning Insert Rotary Locking Mechanism
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Solution Overview
Problem
Existing turning tools with triangular inserts face instability and limited design freedom due to reliance on converging side support surfaces for fixation, leading to potential dislodgment and impaired dimensional accuracy during thread turning.
Innovation Solution
The use of elongate, straight engagement members in the insert seat and turning insert, forming a rotary locking mechanism that reduces the reliance on side support surfaces, allowing for stable fixation and increased space for complex tooth design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If converging side support surfaces are used to fix the turning insert, then the insert is retained in the insert seat, but the fixation becomes unstable and the insert may dislodge during thread turning
Solution Approach 1:
The fixation system is segmented into multiple independent engagement members (at least two) distributed around the periphery of the turning insert. Each engagement member independently restrains the insert, distributing the fixation function across multiple locations rather than relying on a single converging surface mechanism.
Solution Approach 2:
Engagement members are positioned at specific locations (e.g., at corners or midpoints of sides) of the turning insert rather than using continuous converging surfaces. This localizes the fixation function to discrete points, improving stability while simplifying the overall structure.
2Ease of manufacture
If converging side support surfaces are used for fixation, then the insert is retained, but design freedom for complex tooth formation is limited
Solution Approach 1:
The fixation function is segmented into discrete engagement members that can be independently designed and positioned. This segmentation decouples the fixation requirement from the tooth design, allowing complex tooth geometries to be formed without being constrained by continuous side support surfaces.
Solution Approach 2:
The fixation mechanism transitions from relying on surface contact (2D converging surfaces) to point or line contact through discrete engagement members. This dimensional change provides more flexibility in tooth design while maintaining reliable retention.
3Force
If a 60° convergence angle is used for side surfaces, then the insert can be retained, but the wedging effect is insufficient under varying cutting forces
Solution Approach 1:
The fixation force is distributed across multiple discrete engagement members rather than relying on the wedging effect of continuous converging surfaces. This segmentation allows each engagement member to be optimized for force transmission without being constrained by a fixed 60° convergence angle.
Solution Approach 2:
The design moves away from a fixed convergence angle parameter to a more flexible arrangement of discrete engagement members. This allows the geometry and positioning of engagement members to be optimized for the actual cutting forces experienced during thread turning, improving the wedging effect without being constrained by a predetermined angle.
Data Source
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AI summary
The invention relates to a turning tool comprising a basic body (1) as well as an indexable turning insert (2) having a triangular basic shape, which is fixed in an insert seat (4) in the basic body. The turning insert is formed with three side surfaces (20) that are situated in an imaginary, equilateral triangle and therefore converge in pairs at an angle of 60° toward corners in which cutting edges (22) are included. The turning insert is connected to the insert seat via an interface, which comprises, on one hand, a single active, elongate and straight engagement member (27), e.g., a ridge, and three alternately usable engagement members (28), e.g., grooves, in the turning insert. The last-mentioned members (28) are located in a second, imaginary triangle having an equilateral shape, which is smaller than the first-mentioned triangle and rotated in relation to the same. In addition to the tool, the invention also relates to a turning insert as such.