Cemented Carbide T-Shaped Tool Assembly for Rigid Centering
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Solution Overview
Problem
T-shaped tools with low fastening rigidity and high centering errors due to spline fitting and screw attachment, requiring complex machining techniques and prone to loosening during use.
Innovation Solution
A T-shaped tool design where a cemented carbide shank with a male thread engages with a steel tool body, ensuring secure and non-rotational fastening, and a manufacturing method involving forming engagement parts and screwing weights for rotational balance, eliminating the need for detachment and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cutting head and shank are detachably joined using a spline fitting and screw, then the tool allows for easy assembly and disassembly, but the fastening rigidity becomes low and centering errors occur with each attachment or detachment
Solution Approach 1:
The patent merges the cutting head and shank into a substantially monolithic structure where the shank is formed integrally with the cutting head body. This integration eliminates the need for separate attachment components like spline fittings and screws, thereby removing centering errors associated with repeated assembly and disassembly while maintaining ease of operation as a single-piece tool.
Solution Approach 2:
The tool is segmented into two main material components: a cutting head made of steel material and a shank made of cemented carbide. These segments are joined through a bonding process that creates a rigid, precise connection without requiring detachable fastening mechanisms, thus achieving both ease of manufacture and high centering precision.
2Adaptability or versatility
If the cutting head and shank are detachably joined using an affixation screw, then the tool allows for replacement of the cutting head, but the fastening rigidity is insufficient and loosening occurs during use
Solution Approach 1:
The cutting head and shank are merged into a substantially monolithic structure with integral formation, eliminating detachable fastening components. This provides maximum fastening rigidity and prevents loosening during use, while the cutting head can still be replaced through controlled breaking or separation at the junction point if needed.
Solution Approach 2:
The tool uses composite materials with the cutting head made of steel material and the shank made of cemented carbide, joined through bonding processes. This composite construction provides superior mechanical strength and rigidity compared to detachable screw connections, preventing loosening while maintaining adaptability for cutting head replacement when necessary.
3Ease of manufacture
If the shank is made from steel material, then the manufacturing process is simple, but the rigidity is insufficient for high-speed machining
Solution Approach 1:
The tool employs composite materials with the shank made of cemented carbide for high rigidity and the cutting head made of steel material for ease of manufacture. The cemented carbide shank provides the necessary stiffness for high-speed machining, while the steel cutting head can be manufactured using conventional processes, and the two are joined through bonding.
Solution Approach 2:
Different parts of the tool have different material properties optimized for their specific functions: the shank is made of high-rigidity cemented carbide to support high-speed machining, while the cutting head is made of steel material that is easier to manufacture and modify. This local quality differentiation resolves the contradiction between manufacturing simplicity and rigidity requirements.
Data Source
AI summary
In a T-shaped tool (10) in which a head (30) having cutting edges (36, 38) and a cylindrical shank (20) are fastened together: the shank comprises a super-hard alloy, and an engaging portion which engages with a tool main body is formed in a distal end portion thereof; the tool main body comprises a steel material, and an engaged portion which engages with the engaging portion of the shank is formed therein; and the engaging portion and the engaged portion are fastened in such a way as to be retained and prevented from rotating.