Cutting Tool Insert Fastening via Nested Screw Through-Hole
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Solution Overview
Problem
Existing cutting tools face challenges in securely positioning and stabilizing indexable inserts during the cutting process, leading to potential insert misalignment and increased risk of being thrown off due to centrifugal forces, which affects cutting efficiency and tool durability.
Innovation Solution
A cutting tool design featuring an elongated holder with radially arranged insert pockets and a screw system with a first engagement portion within a through-hole of the insert, allowing for precise positioning and secure fastening of the insert, reducing the likelihood of misalignment and ejection during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional clamps and screws are used to fasten inserts, then the insert can be secured to the holder, but the insert may still become misaligned or ejected due to centrifugal forces during rotation
Solution Approach 1:
The screw is positioned to extend through the insert's through-hole, with the first engagement portion located within the through-hole. This nested configuration allows the screw to pass through and engage with the insert internally, creating a more secure fastening that resists centrifugal forces better than conventional external fastening methods.
Solution Approach 2:
The fastening mechanism utilizes the through-hole dimension of the insert, extending the screw through the thickness of the insert rather than only fastening from the external surface. This adds a dimensional aspect to the fastening that improves reliability by anchoring the insert from both sides.
2Manufacturing precision
If the screw is positioned outside the through-hole, then the fastening structure is simpler, but the insert positioning precision and stability are reduced
Solution Approach 1:
The first engagement portion of the screw is positioned within the through-hole of the insert, utilizing the existing through-hole structure to improve positioning precision. This nested arrangement allows for more accurate alignment and reduces misalignment during high-speed rotation.
3Reliability
If conventional fastening methods are used, then the device structure is simpler, but the risk of insert ejection due to centrifugal forces is higher
Solution Approach 1:
The screw extends through the insert's through-hole, utilizing the thickness dimension of the insert to create a more reliable fastening. This through-fastening approach anchors the insert more securely against centrifugal forces while maintaining reasonable ease of operation through standard screw fastening procedures.
Data Source
AI summary
In an embodiment, a cutting tool includes a holder and a cutting insert. The holder is elongated and includes an insert pocket that is located on a side of a first end. The cutting insert is secured to the insert pocket. The cutting tool further includes a clamp that fastens the cutting insert in the insert pocket, and a screw that comes in contact with the cutting insert and is secured to the insert pocket. The screw includes a first surface including a first engagement portion on a first surface that is located on a side of the first end. The first engagement portion is located within a through-hole included in the screw in a front view of the first end.