Double-Sided Circular Cutting Insert Antirotation Design
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Solution Overview
Problem
Current indexable rotary cutting tools with circular cutting inserts face challenges in maintaining indexing accuracy, preventing rotation, and suppressing vibrations during high-speed cutting operations, particularly due to the cylindrical or conical shape of the cutting insert side surfaces which lead to rotational moments and displacement issues.
Innovation Solution
A double-sided circular cutting insert design featuring planar restraining faces and antivibration restraining faces with inclined surfaces, along with antirotation surfaces, that are strategically positioned to prevent rotation and absorb vibrations when attached to an indexable rotary cutting tool, utilizing a screw insertion hole and specific angle configurations to enhance attachment and operational stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cutting insert side surface is formed into a columnar or conical shape, then the cutting insert structure is simple and easy to manufacture, but the cutting insert easily rotates during cutting operation due to rotational moment
Solution Approach 1:
The cutting insert side surface is divided into multiple planar faces (first and second planar faces) instead of a continuous columnar or conical surface. These segmented planar faces create discrete contact points with the tool body that effectively prevent rotation while maintaining manufacturing simplicity.
Solution Approach 2:
The cutting insert employs asymmetric planar faces with specific inclination angles relative to the cutting direction. This asymmetric configuration creates unequal contact conditions that generate counteracting moments to prevent rotational displacement during cutting operations.
2Reliability
If the cutting insert is firmly fixed by tightening the clamp screw, then the cutting insert is securely attached to the tool body, but vibrations occur due to the turning force about the clamp screw
Solution Approach 1:
The planar faces on the cutting insert side surface are designed to convert the harmful turning force (rotational moment) into a beneficial contact force. The inclined planar faces transform the rotational tendency into axial compression against the tool body, eliminating vibrations while maintaining secure attachment.
3Duration of action of moving object
If the circular cutting insert is rotated to use unused cutting edges, then the cutting insert service life is extended, but indexing accuracy is difficult to maintain
Solution Approach 1:
The cutting insert incorporates predetermined planar faces with specific geometric configurations that serve as built-in indexing references. These pre-configured surfaces automatically guide the cutting insert to the correct rotational position when reattached to the tool body, eliminating the need for complex indexing procedures and ensuring accurate positioning for extended service life.
Data Source
AI summary
In a circular cutting insert of the present invention, the upper side surface and the lower side surface each include: a plurality of planar restraining faces which are disposed sequentially in a circumferential direction of the upper side surface and the lower side surface so as to interpose a joint portion between each of the planar restraining faces and each have a side disposed on the side surface-intermediate line (N); and a plurality of antivibration restraining faces which are each disposed between two planar restraining faces adjacent through the joint portion and each include an inclined face, and the restraining faces of the lower side surface are disposed so as to be shifted with respect to the restraining faces of the upper side surface by a predetermined angle (α) around a central axis of a screw insertion hole.