Transverse Insert Holder Geometry for Small-Hole Internal Cutting
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Solution Overview
Problem
Existing cutting tools with transversely oriented insert receiving pockets face challenges when inserting into small holes due to the radial dimension contributed by the stopper support portion, which hinders insertion during internal cutting operations like boring or internal grooving.
Innovation Solution
The design features a pocket stopper surface that slopes away from the pocket front opening, along with a resilient clamping mechanism that allows the cutting insert to be securely held without additional clamping devices, reducing the radial dimension and enhancing insertion capabilities into smaller spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stopper support portion is provided behind the pocket stopper surface to provide strength and rigidity, then the strength and rigidity of the pocket stopper surface is improved, but the radial dimension of the cutting tool increases
Solution Approach 1:
The pocket stopper surface is designed to slope towards the pocket longitudinal plane rather than extending radially outward. This dimensional reorientation allows the stopper support portion to provide structural strength in the longitudinal direction while minimizing radial dimension, enabling insertion into small holes while maintaining structural integrity
Solution Approach 2:
The pocket stopper surface is designed with an asymmetric sloping configuration where the surface angles differently relative to the pocket longitudinal plane. This asymmetric design optimizes the distribution of mechanical loads, providing adequate strength and rigidity support while minimizing the radial footprint of the tool holder
2Reliability
If additional clamping devices are used to secure the cutting insert, then the clamping reliability is improved, but the device complexity and radial dimension increase
Solution Approach 1:
The pocket stopper surface and pocket upper clamping surface work together to automatically position and secure the cutting insert through their sloping configurations. The insert is guided into the correct position by the sloping stopper surface and retained by the interaction between the sloping clamping surface and the insert, eliminating the need for separate clamping devices while maintaining secure retention
Solution Approach 2:
The functions of stopping, positioning, and clamping the cutting insert are merged into a single integrated pocket structure. The sloping pocket stopper surface and sloping pocket upper clamping surface work together as a unified mechanism to both position and secure the insert, reducing device complexity while maintaining clamping reliability
Data Source
Figure 1~2
Figure 2a~2b
Figure 3~4
AI summary
A cutting tool (20) includes a two-way indexable cutting insert (22) clamped in a transversely oriented insert receiving pocket (46) of an insert holder (24). The insert holder (24) includes a forwardly located insert mounting portion (32) that includes upper and lower jaws (34, 36) which together define the insert receiving pocket (46) having a pocket front opening (52a). The lower jaw (36) includes a pocket lower clamping surface (54). The upper jaw (34) includes a pocket upper clamping surface (60) which faces mutually towards the pocket lower clamping surface (54) and a pocket stopper surface (68) facing generally towards the pocket front opening (52a). The pocket stopper surface (68) is closer to the pocket lower clamping surface (54) and further from the pocket front opening (52a), than the pocket upper clamping surface (60). The pocket stopper surface (68) is further from the pocket rear opening (52b) than the pocket lower clamping surface (54).