Helical Flute Tool with Variable Pitch Angles for Stacked Material Machining
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Solution Overview
Problem
Machining stacked materials with different characteristics, such as FRP-Ti and FRP-Al, is challenging due to the need for tools designed for specific materials, leading to shorter tool life and poor surface finishes, and sharp chips from one material can damage the more delicate material during machining.
Innovation Solution
A tool with helical flutes having different pitch angles, where the first portion is designed for materials producing sharper chips and the second portion is designed for more delicate materials, allowing for optimized machining characteristics and chip direction to minimize damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single pitch angle is used for the entire flute, then the tool structure is simple, but it cannot provide optimal machining characteristics for both materials in the stacked workpiece
Solution Approach 1:
The flute is divided into two distinct portions: a first portion with a first pitch angle (e.g., 30-45 degrees) for machining the first material, and a second portion with a second pitch angle (e.g., 5-20 degrees) for machining the second material. This segmentation allows each portion to be optimized for its specific material while maintaining a unified tool structure.
Solution Approach 2:
Different sections of the flute are assigned different pitch angles tailored to the specific requirements of each material layer. The first portion has a larger pitch angle suitable for one material type, while the second portion has a smaller pitch angle optimized for another material type, ensuring local optimization throughout the machining process.
2Productivity
If chips from one material are extracted through the flute, then material removal is efficient, but sharp chips can scratch and damage the more delicate stacked material
Solution Approach 1:
The flute geometry is designed to convert the potentially harmful sharp chips into a beneficial outcome by directing them along a controlled path that prevents contact with the delicate stacked material. The chip flow is channeled through the flute structure to exit in a direction that protects the workpiece.
Solution Approach 2:
The flute acts as an intermediary channel that mediates between the chip generation zone and the workpiece surface. By carefully designing the flute's pitch angle and geometry, the system controls chip transport to prevent direct interaction between sharp chips and the delicate stacked material, thus protecting the workpiece while maintaining efficient chip removal.
Data Source
Figure 1A~1B
Figure 2A~3B
Figure 4A~4B
AI summary
A tool for machining a stacked material workpiece includes a tool body (23) comprising one or more helical flutes (25) extending to a forward end (27) of the tool body. Each helical flute has a width defined by a first cutting edge (29) and a second edge (31), a surface (33) of the flute adjacent the first cutting edge facing the forward end of the tool body and a surface (35) of the flute adjacent the second edge facing away from the forward end of the tool body. Each helical flute can include a first portion (37) having a first pitch angle and a second portion (39) having a second pitch angle different from the first pitch angle, the first portion extending from the forward end of the tool body to the second portion. A method for machining a stacked material is also disclosed.