Left-Handed and Right-Handed Cutting Tool Insert Holder
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Solution Overview
Problem
Existing cutting tools for internal machining operations lack efficient and precise securement in both left-hand and right-hand assembly positions, leading to potential misalignment and reduced manufacturing efficiency.
Innovation Solution
A cutting tool design featuring a cutting insert with three spaced apart abutment surfaces and an insert holder with four reaction surfaces, allowing securement in both left-hand and right-hand positions through a fastener, ensuring clamping contact and mirror symmetry for effective machining operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cutting insert with multiple engagement regions is used to secure the cutting insert in both left-hand and right-hand assembly positions, then the cutting insert can be secured in multiple positions, but the alignment precision and securement reliability are reduced due to the same cutting portion presenting to both positions
Solution Approach 1:
The cutting insert is designed with asymmetric features including a single cutting portion positioned at a specific location, three abutment surfaces arranged asymmetrically around the periphery, and mirror symmetry about a plane that bisects the cutting edge. This asymmetric configuration ensures that only one assembly position (either left-hand or right-hand) provides proper alignment between the cutting portion and the workpiece, while the other position is intentionally misaligned. The three abutment surfaces are positioned such that they engage with three of four reaction surfaces on the insert holder, creating a geometric constraint that enables securement in both positions but only achieves precise alignment in one position, thereby resolving the contradiction between position versatility and alignment precision.
2Productivity
If a cutting insert with a single cutting portion is used, then manufacturing efficiency is improved, but the ability to perform both left-hand and right-hand machining operations is limited
Solution Approach 1:
The cutting insert is designed with universality to perform multiple functions: it can be securely assembled in both left-hand and right-hand assembly positions using the same single cutting portion. The mirror symmetry about a plane perpendicular to the insert central axis and bisecting the cutting edge, combined with the three abutment surfaces engaging three of four reaction surfaces, allows the same cutting insert to be used for both left-hand and right-hand internal machining operations. This eliminates the need for separate cutting inserts for different hand configurations, thereby improving manufacturing efficiency while maintaining machining operation versatility.
3Reliability
If four reaction surfaces are provided on the insert holder, then securement reliability is improved, but the device complexity increases
Solution Approach 1:
The insert holder is designed with four reaction surfaces, which is one more than the minimum three abutment surfaces on the cutting insert. This excessive action provides enhanced securement reliability by ensuring that three abutment surfaces can always engage with three of the four reaction surfaces regardless of the assembly position (left-hand or right-hand). The fourth reaction surface provides additional engagement capability and tolerance compensation. This partial excess (one additional reaction surface) achieves high reliability without significantly increasing device complexity, as the additional surface simply extends the existing pattern rather than adding a completely new coupling mechanism.
Data Source
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AI summary
In a cutting tool (20) used for internal machining operations, a cutting insert (22) with a single cutting portion (24) is removably secured to an insert holder (26). The cutting insert (22) has two opposing end surfaces (30a, 30b), and an insert peripheral surface (32) extending therebetween having three spaced apart abutment surfaces (34,36,38). The insert holder (26) has a holder portion (26) with a holder peripheral surface (48) and an adjacent seating surface (50). At least one protuberance (54a, 54b) having four spaced apart reaction surfaces (56a, 56b, 56c, 56d) protrudes from the seating surface (50). The cutting insert (20) is securable to the holding portion (26) in left-hand and right-hand assembly positions, with the three abutment surfaces (34,36,38) in clamping contact with three of the four reaction surfaces. In the left-hand assembly position, a first end surface (30a) is in clamping contact with the seating surface (50), and in the right-hand assembly position, a second end surface (30b) is in clamping contact with the seating surface (50).