Lightweight Rotary Cutting Tool Structure for High Stiffness
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Solution Overview
Problem
Conventional rotary cutting tools are heavy, making them difficult to handle and operate, and their weight restricts manual lifting and tool change efficiency, while maintaining stiffness is a challenge in reducing weight without compromising performance.
Innovation Solution
The use of topology optimization techniques combined with additive manufacturing (3D printing) to create a support structure that minimizes weight while maintaining stiffness, resulting in a higher stiffness-to-weight ratio for rotary cutting tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional rotary cutting tools are used, then they provide adequate stiffness and strength, but they have high weight making them difficult to handle and operate
Solution Approach 1:
The cutting tool is divided into multiple functional zones including a body portion, a cutting portion with insert pockets, and a transition portion connecting them. Each zone is optimized independently for its specific function while maintaining overall structural integrity, allowing weight reduction in non-critical areas while preserving stiffness where needed.
Solution Approach 2:
The transition portion incorporates three-dimensional curved surfaces and complex geometries that cannot be achieved with conventional manufacturing. This dimensional complexity allows material to be strategically distributed in space, creating optimized load paths that reduce weight while maintaining structural performance.
2Weight of moving object
If material is removed to reduce weight, then the cutting tool becomes lighter and easier to handle, but the stiffness and strength are compromised
Solution Approach 1:
Different regions of the cutting tool have different material densities and structural characteristics optimized for their specific functions. The body portion has one structural configuration while the cutting portion and transition portion have different configurations, allowing each area to have the exact material properties needed for its role without unnecessary weight elsewhere.
Solution Approach 2:
The structural parameters such as wall thickness, material distribution, and geometric features are continuously varied throughout the tool structure. The transition portion exhibits gradual parameter changes that optimize stress distribution, allowing the structure to adapt to varying load conditions while minimizing material usage.
3Ease of manufacture
If conventional manufacturing methods are used, then the cutting tool can be produced with standard geometries, but the design flexibility and optimization are limited
Solution Approach 1:
The transition portion incorporates three-dimensional curved surfaces and complex geometries that are manufactured using additive manufacturing technology. This enables design freedom in all three spatial dimensions, allowing optimization of material distribution and structural efficiency that would be impossible with conventional two-dimensional manufacturing methods.
Solution Approach 2:
The cutting tool utilizes composite structures combining different materials and manufacturing techniques. The body portion may be manufactured using conventional methods while the cutting portion and transition portion use additive manufacturing, creating a hybrid structure that leverages the advantages of both approaches.
Data Source
AI summary
A rotary cutting tool includes a disc-like central body having an outer peripheral surface. A peripheral support member extends circumferentially along the peripheral outer surface of the disc-like central body and provides support against centrifugal and cutting forces exerted on an insert pocket during a cutting operation. A radial support member extends radially along the disc-like central body to the peripheral support member. The radial support member structurally interacts with the peripheral support member to provide additional support for the insert pocket against centrifugal and cutting forces exerted on the insert pocket during a cutting operation. The radial support member and the peripheral support member have a three-dimensional topology that maximizes a stiffness-to-weight ratio of the rotary cutting tool. The rotary cutting tool may include a second radial support member extending radially along the disc-like central body to the peripheral support member.