Through-Hole Cutting Insert With Multi-Surface Thin-Holder Support
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Solution Overview
Problem
Existing cutting inserts face challenges in maintaining blade-edge positional accuracy and requiring holders of larger thickness, which limits their versatility and efficiency, especially when one cutting edge is damaged or when using smaller holders.
Innovation Solution
A vertical-type cutting insert with a through hole and multiple contact surfaces, including first, second, and third contact surfaces, allows for secure holding by a holder of smaller thickness, enabling the use of damaged cutting edges and maintaining positional accuracy through symmetric and inclined surface configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the cutting insert size is made smaller, then the holding force is lowered, but the blade-edge positional accuracy deteriorates
Solution Approach 1:
The cutting insert is divided into multiple functional surfaces: a first contact surface for positioning, a second contact surface for supporting the damaged cutting edge, and a third contact surface for additional stability. This segmentation allows each surface to perform a specific function, maintaining accuracy even when the overall insert size is reduced.
Solution Approach 2:
The invention transitions from relying solely on the peripheral side surface for support to utilizing multiple surfaces including the first, second, and third contact surfaces. By adding dimensional complexity to the contact interfaces, the holder can maintain firm holding and positional accuracy with smaller insert sizes.
2Strength
If a contact surface is provided to restrict the cutting insert to a periphery of the blade edge, then the holding force is improved, but the versatility deteriorates when one cutting edge is damaged
Solution Approach 1:
The second contact surface is specifically positioned to support the damaged cutting edge area, while the first and third contact surfaces maintain overall positioning and stability. This local specialization allows the insert to be held securely even when one cutting edge is damaged, as the support is distributed across multiple surfaces rather than relying on a single peripheral contact.
3Stability of the object's composition
If the holder thickness is increased to support the peripheral side surface, then the holding stability is improved, but the device complexity increases
Solution Approach 1:
The holding function is segmented across multiple contact surfaces (first, second, and third) rather than relying on a single peripheral side surface. This allows the holder to achieve stable support with reduced thickness, as the multiple surfaces distribute the support load more efficiently.
Solution Approach 2:
The invention moves from single-dimension peripheral side surface support to multi-dimensional contact surface support. By utilizing multiple surfaces oriented in different directions, the holder achieves enhanced stability without requiring increased thickness, thereby reducing device complexity.
Data Source
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AI summary
A cutting insert and a cutting tool which can suppress lowering of blade-edge positional accuracy while holding by a holder having a small thickness is enabled are provided. The cutting insert (10) includes a first end surface, a second end surface, and a peripheral side surface connected to the first end surface and the second end surface and having a rake face, a flank, and a cutting edge formed in a connection region between the rake face and the flank, and a through hole penetrating the first end surface and the second end surface is formed. It is the cutting insert including a first contact surface substantially perpendicular to a center axis direction of the through hole and capable of contacting the holder, a second contact surface substantially in parallel with the center axis direction of the through hole, substantially perpendicular to a plane including the first contact surface and capable of contacting the holder, and a third contact surface inclined with respect to the center axis direction of the through hole and capable of contacting the holder, and a cutting tool including the cutting insert as above.