Cutting Tool Shank Rigidity for T-Groove Machining
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Solution Overview
Problem
The annular groove in steam turbines with a T-shape design poses challenges in machining accuracy due to the small opening width on the outer periphery, leading to reduced rigidity and increased vibration of the cutting tool, which complicates precise cutting.
Innovation Solution
A cutting tool with a chip holder design that includes a body part with a higher height than width, a reinforcement part, and a chip receiving part, which enhances rigidity and torsional stability, along with a tapered shape to support the cutting chip and prevent interference, allowing for stable attachment and reduced vibration during machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a special cutting tool with a narrow shank is used to machine the T-shaped annular groove, then the cutting tool can access the small opening width on the outer periphery side of the rotor, but the rigidity of the shank is lowered and the cutting chip vibrates during machining
Solution Approach 1:
The invention transitions from a conventional narrow shank design to a plate-like body part with height greater than width. This dimensional change allows the cutting tool to maintain accessibility to the small opening width while gaining rigidity through the increased height dimension, effectively resolving the contradiction between accessibility and structural strength.
Solution Approach 2:
The body part is designed with asymmetric dimensions where the height dimension is intentionally made larger than the width dimension. This asymmetric configuration optimizes the structural properties by providing greater rigidity in the height direction while maintaining a compact width that allows access to the small opening width of the T-shaped groove.
2Adaptability or versatility
If the shank width is reduced to fit the small opening width of the T-shaped groove, then the cutting tool can be inserted into the groove, but the rigidity of the shank is lowered making it difficult to perform highly accurate cutting
Solution Approach 1:
The invention adds a height dimension to the body part, creating a plate-like structure where height exceeds width. This dimensional addition allows the cutting tool to fit the T-shaped groove geometry through its compact width while achieving the necessary rigidity through its increased height, thereby maintaining high machining accuracy.
Solution Approach 2:
The reinforcement part is formed with a curved surface that is convex toward the cutting chip. This curvature design enhances the structural rigidity of the chip support part while maintaining a compact overall shape that adapts to the T-shaped groove geometry, thus preserving both adaptability and manufacturing precision.
3Ease of operation
If a narrow shank is used to match the small opening width, then the cutting tool can access the groove, but the cutting chip vibrates during machining
Solution Approach 1:
By changing from a conventional cylindrical shank to a plate-like body part with height greater than width, the invention maintains accessibility to the groove opening through its compact width while suppressing cutting chip vibration through the enhanced rigidity provided by the increased height dimension.
Solution Approach 2:
The reinforcement part acts as an intermediary structural element between the body part and the chip support part. It provides additional rigidity and structural support that prevents cutting chip vibration during machining, while the overall compact design maintains accessibility to the groove opening.
Data Source
AI summary
A cutting tool includes a cutting chip and a chip holder. The chip holder includes: a body part having a height dimension larger than a width dimension, the body part including a first attachment face that intersects with a cutting feed direction, and a second attachment face that intersects with the first attachment face; a chip support part whose base end portion is connected to the body part and in which the cutting chip is attached to the upper end portion in the height direction of a tip end portion of the chip support part such that the cutting chip projects to one side in the width direction of the chip support part; a reinforcement part provided along the height direction of the chip support part; and a chip receiving part that supports the cutting chip projecting from the chip support part.