Double-Ended Cutting Insert Clamping 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 into tight spaces during internal cutting operations.
Innovation Solution
The design features an elongated insert holder with a transversely oriented insert receiving pocket that reduces the radial dimension by positioning the pocket stopper surface closer to the pocket lower clamping surface, allowing for a more compact and flexible clamping mechanism without additional clamping devices, and a double-ended cutting insert with specific abutment and stopper surfaces for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pocket stopper surface is formed on the lower jaw with a stopper support portion, then the cutting insert is positioned in a predefined position, but the radial dimension of the cutting tool increases
Solution Approach 1:
The stopper support portion is repositioned from the lower jaw to the upper jaw, utilizing the vertical dimension (holder longitudinal axis) to provide support. This dimensional relocation allows the stopper support function to be achieved without increasing the radial dimension, as the support structure now extends along the longitudinal axis rather than radially outward.
Solution Approach 2:
Instead of forming the stopper support portion on the lower jaw as in conventional designs, the invention inverts the arrangement by positioning the stopper support portion on the upper jaw. This inversion allows the clamping surfaces to be formed on the lower jaw, thereby reducing the radial dimension while maintaining insert positioning precision through the upper jaw's stopper support.
2Reliability
If additional clamping devices are used to secure the cutting insert, then the clamping reliability is improved, but the device complexity increases
Solution Approach 1:
The upper jaw is designed with resilient properties that enable it to automatically clamp the cutting insert when closed. The resilient material provides the clamping force through elastic deformation, eliminating the need for additional clamping devices such as screws or springs. This self-service mechanism maintains high clamping reliability while minimizing device complexity.
Solution Approach 2:
The invention utilizes the physical parameter of material resilience by selecting resilient material for the upper jaw. This parameter change allows the upper jaw to provide active clamping force through its elastic properties, replacing complex mechanical clamping systems with a simpler resilient-based solution that maintains reliable clamping.
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 enables efficient internal cutting operations in smaller diameters by minimizing the tool's radial dimension and providing resilient clamping without additional hardware, enhancing the tool's versatility and precision in small-hole applications.
Implementation Method 1
the upper jaw being movable with respect to the lower jaw by rotating around a pivot axis
Implementation Method 2
an insert receiving pocket configured to receive a cutting insert therein, the insert receiving pocket being formed in the clamping recess
Data Source
AI summary
A cutting tool includes a two-way indexable cutting insert clamped in a transversely oriented insert receiving pocket of an insert holder. The insert holder includes a forwardly located insert mounting portion that includes upper and lower jaws which together define the insert receiving pocket having a pocket front opening. The lower jaw includes a pocket lower clamping surface. The upper jaw includes a pocket upper clamping surface which faces mutually towards the pocket lower clamping surface and a pocket stopper surface facing generally towards the pocket front opening. The pocket stopper surface is closer to the pocket lower clamping surface and further from the pocket front opening, than the pocket upper clamping surface. The pocket stopper surface is further from the pocket rear opening than the pocket lower clamping surface.