Cutting Insert Clamping Lever for Stable Pin Contact
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Solution Overview
Problem
Existing cutting tools face difficulties in stabilizing the contact point between the lever and the cutting insert, leading to inconsistent tilting and inadequate force for firmly fixing the cutting insert, resulting in potential disengagement.
Innovation Solution
A cutting tool design featuring a main body with a placement surface, a lever accommodating hole, a pin accommodating hole, and a screw accommodating hole, where the pin presses the lever's concave surface, allowing the lever to tilt stably and effectively pull the cutting insert into place, with a projecting portion acting as a fulcrum to enhance stability and a notch for easy removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lever is tilted accurately and as designed to pull the cutting insert into the placement surface, then the cutting insert can be firmly fixed, but it is difficult to stabilize the contact point between the pin and the lever, causing the tilting direction to vary
Solution Approach 1:
The invention replaces the conventional point contact between the pin and lever with a line contact by forming a concave surface on the lever that matches the cylindrical surface of the pin. This curvature matching creates a line contact region instead of a single point, stabilizing the contact point and ensuring consistent lever tilting direction while maintaining reliable fixation of the cutting insert.
2Device complexity
If a conventional lever mechanism is used with a cylindrical through hole, then the structure is simple, but the contact point between pin and lever cannot be stabilized at one point, leading to varying tilting directions
Solution Approach 1:
The invention modifies the lever by adding a concave surface that corresponds to the cylindrical pin, transforming the contact geometry from point to line. This maintains the overall simplicity of the lever mechanism while significantly improving contact point stability and consistent tilting behavior.
3Strength
If the lever is designed to pull the cutting insert firmly into the placement surface, then fixation strength is improved, but the contact point deviation causes inconsistent pulling force
Solution Approach 1:
By forming a concave surface on the lever that matches the pin's cylindrical surface, the invention creates a line contact region that stabilizes the contact point. This ensures that the pulling force is consistently applied in the correct direction, maintaining both high fixation strength and reliable force consistency across multiple operations.
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 design ensures a firm fixation of the cutting insert by stabilizing the lever's tilt and converting the pin's pressing force into a consistent pulling force, reducing disengagement and facilitating maintenance.
Implementation Method 1
A tip portion of the pin presses the lever by the rear end portion being pressed against the screw
Implementation Method 2
The lever has a concave surface configured by a line segment parallel to a reference axis and, by the concave surface being pressed against the tip portion of the pin, a head protruding into the hole of the placed cutting insert presses an inner wall of the hole and presses and fixes the cutting insert against and to the placement surface and the side wall
Data Source
AI summary
[Problem] A cutting tool to which a cutting insert can be firmly fixed is provided.[Means for Resolution] Provided is a cutting tool where a replaceable cutting insert having a hole for fixing is mountable. The cutting tool includes a main body portion, a lever, a pin, and a screw. The main body portion has a placement surface where the cutting insert is placed, a side wall coming into contact with at least one side surface of the cutting insert, a lever accommodating hole, a pin accommodating hole, and a screw accommodating hole. The screw presses a rear end portion of the pin by being tightened. A tip portion of the pin presses the lever by the rear end portion being pressed against the screw. The lever has a concave surface configured by a line segment parallel to a reference axis and, by the concave surface being pressed against the tip portion of the pin, a head protruding into the hole of the placed cutting insert presses an inner wall of the hole and presses and fixes the cutting insert against and to the placement surface and the side wall.