Cutting Insert Screw Layout for Stable Complex Machining
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Solution Overview
Problem
Cutting tools face challenges in maintaining machining accuracy due to insert shaking during high-load machining, as increasing the insert's length compromises screw restraint, and making the insert thin compromises strength and rigidity.
Innovation Solution
The cutting insert design features a thin front end portion with a recessed center portion for the second screw, ensuring the screws do not overlap in the longitudinal direction, providing enhanced durability and stability by distributing machining loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the insert's length is increased to maintain screw restraint, then the insert's stability is improved, but the machining efficiency deteriorates due to the inability to perform complex machining
Solution Approach 1:
The patent applies dimensionality change by arranging screws in the longitudinal direction (front-rear arrangement) rather than only in the lateral direction. This allows the insert to maintain stability through proper screw restraint while keeping the insert length short, enabling complex machining operations. The recessed portion in the upper surface provides a seating position for the second screw's head, allowing effective load distribution without increasing insert length.
2Adaptability or versatility
If the insert is made thin to enable complex machining, then the adaptability is improved, but the strength and rigidity deteriorate
Solution Approach 1:
The patent applies local quality by creating a recessed portion at the center of the insert's upper surface, concentrating structural reinforcement at this specific location. This recessed portion provides a seating position for the second screw's head, creating a localized reinforcement zone that enhances overall insert strength and rigidity without increasing the insert's thickness. This allows the insert to maintain thin dimensions for complex machining while having enhanced strength at critical locations.
3Reliability
If multiple screws are used to restrain the insert, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the screw restraint system into two distinct components: a first screw arranged in the lateral direction and a second screw arranged in the longitudinal direction. This segmented arrangement allows each screw to perform its specific restraint function independently, improving overall reliability through distributed load bearing while maintaining clear functional separation that simplifies the overall design and assembly process.
Data Source
AI summary
An insert includes an upper surface, a lower surface, lateral surfaces, a cutting edge, and a through hole. The upper surface includes a first corner having a protruding curve shape and a first side and a second side extending from the first corner. A first region of a first lateral surface has a recessed shape recessed toward an axis. The upper surface further includes a recessed portion that is located between the second side and the axis and is recessed toward the axis. An entirety of the recessed portion is located farther from the first corner than an entirety of the first region in a direction along the axis.