Replaceable Cutting Head Coupling for Rigid Rotary Tool Mounting
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Solution Overview
Problem
Existing rotary cutting tools with threaded coupling mechanisms lack sufficient rigidity and stability against lateral cutting forces, and are complex to manufacture, particularly when featuring two conical abutment surfaces.
Innovation Solution
A replaceable cutting head with a male coupling member and a tool holder featuring conical abutment surfaces and straight threads, where the forward and rearward head cone angles are within ±0.5° of each other, allowing for easy assembly and improved stability through elastic deformation of the tool holder's supporting portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If two conical abutment surfaces are used in the coupling mechanism, then the rigidity and stability against lateral cutting forces are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by specifying that the forward and rearward head cone angles are within ±0.5° of each other, and the forward and rearward holder cone angles are within ±0.5° of each other. This tight angular tolerance control simplifies the manufacturing process while maintaining the rigidity benefits of dual conical abutment surfaces, directly resolving the contradiction between strength and manufacturing complexity.
2Stability of the object's composition
If two conical abutment surfaces are used in the coupling mechanism, then the stability against lateral cutting forces is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent resolves this contradiction by controlling the cone angle parameters within ±0.5° tolerances. This parameter control ensures stable positioning and lateral force resistance while keeping the manufacturing process manageable through standardized angular specifications.
Solution Approach 2:
The conical abutment surfaces provide self-aligning and self-centering functionality during assembly. The complementary cones automatically guide the cutting head into proper position within the tool holder, ensuring stability against lateral forces without requiring complex external alignment mechanisms, thus simplifying manufacturing.
3Manufacturing precision
If conical abutment surfaces with tight angular tolerances are used, then accurate positioning and prevention of axial run-out are achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies that the forward and rearward head cone angles are within ±0.5° of each other, and the holder cone angles are within ±0.5° of each other. This controlled parameter variation achieves accurate positioning and prevents axial run-out while maintaining reasonable manufacturing precision requirements, resolving the contradiction between positioning accuracy and manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides improved rigidity and stability against lateral cutting forces while simplifying the manufacturing process by ensuring accurate positioning and preventing axial run-out, with a quick self-locking mechanism that maintains a tight fit between the cutting head and tool holder.
Implementation Method 1
improved stability through elastic deformation of the tool holder's supporting portions
Data Source
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Figure 5~6
AI summary
A replaceable cutting head (22) includes a forward cutting portion (26) and a rearward mounting portion (28). The mounting portion (28) includes a male coupling member (38) that protrudes rearwardly from a head base surface (40). The male coupling member (38) includes forward and rearward bearing portions (50, 52) and an external thread (42) located therebetween. The forward and rearward bearing portions (50, 52) include respective conically shaped forward and rearward head abutment surfaces (54, 56). The forward and rearward head abutment surfaces (54, 56) have the same cone angle (α, β). When a cutting tool (20), including said cutting head (22) and a tool holder (24) having a female coupling member (68), is in a locked position, the external thread (42) is threadingly engaged in the female coupling member (68) and the forward and rearward head abutment surfaces (54, 56) conically abut corresponding conical shaped surfaces (84, 88) in the female coupling member (68).