Cutting Tool With Removable Blade And Segmented Body
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Solution Overview
Problem
Conventional rotary cutting tools face challenges in efficiently cutting workpieces due to limitations in tool design, particularly in accessing and removing plugs and chips, and in maintaining a sharp cutting edge.
Innovation Solution
The design incorporates a tool body with strategically positioned gullets and blades, allowing for efficient chip removal and plug access, along with a removable blade system to maintain a sharp cutting edge, and a spade bit configuration with a cutting edge wider than the drive shaft for enhanced cutting capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional rotary cutting tools are used, then the tool structure is simple, but the efficiency of chip removal and plug access is poor
Solution Approach 1:
The tool body is segmented into multiple functional zones with gullets positioned at specific intervals around the circumference. These gullets create discrete openings for chip removal and plug access, allowing the tool to efficiently evacuate cutting debris while maintaining structural integrity. The segmentation principle is applied by dividing the tool body into sections with different functions (cutting zones, chip removal zones, plug access zones).
Solution Approach 2:
The gullets serve multiple functions simultaneously: they act as chip removal channels, provide access to plugs for extraction, and contribute to the overall structural design of the tool body. This multi-functionality resolves the contradiction by enabling efficient chip removal and plug access without requiring separate dedicated structures for each function.
2Reliability
If the cutting edge is fixed, then the tool structure is simple, but the cutting edge becomes dull over time
Solution Approach 1:
The blade system transitions from a fixed configuration to a dynamic, replaceable system. The blade can be removed and repositioned on the tool body, allowing the cutting edge to be renewed when dull. This dynamic capability ensures consistent cutting performance and reliability while maintaining relatively simple tool structure through a straightforward blade replacement mechanism.
Solution Approach 2:
The blade is designed to be discarded when dull and replaced with a fresh blade. The tool body includes features for securing and replacing the blade, enabling users to recover cutting performance by simply swapping the blade rather than replacing the entire tool. This principle resolves the contradiction between maintaining sharp cutting edges and keeping the tool structure simple.
3Productivity
If the cutting edge width equals the drive shaft width, then the tool structure is compact, but the cutting capability is limited
Solution Approach 1:
The tool body is designed with asymmetric dimensions where the cutting edge width is intentionally made greater than the drive shaft width. This asymmetric design allows the cutting portion to have the necessary width for effective cutting operations while the drive shaft portion remains compact for compatibility with standard power tool spindles. The asymmetric geometry resolves the contradiction by optimizing each portion for its specific function.
Data Source
AI summary
A cutting tool includes a tool body having a first end engageable with a workpiece and a second end engageable with a spindle of a power tool. A blade extends outwardly from the first end of the tool body and including a cutting edge, the cutting edge being engageable with a workpiece to cut the workpiece. A bit, including a drive shaft and a cutting end extends along an axis of the tool body. The drive shaft extends axially outwardly beyond the first end of the tool body and terminates at the cutting end. The cutting end has a maximum cross-sectional width greater than a maximum cross-sectional width of the drive shaft, and an axial distance from the first end of the tool body to the cutting end is greater than a maximum cutting depth of the cutting tool.