Cutting Insert Recess Structure for Back-Turning Chip Flow
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Solution Overview
Problem
Conventional turning inserts face challenges in securing a sufficient chip discharge space, particularly during back-turning, due to their support structure, which limits the depth of cut and results in poor chip generation and flow.
Innovation Solution
A cutting insert with a rigid support structure that includes recesses and protrusions on its upper and lower surfaces, allowing for stable mounting and minimizing lateral movement, enabling effective chip discharge by adjusting the angle of the cutting edge with respect to the workpiece centerline.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If both sides of the insert are supported by the insert support portion of the holder in back-turning, then the insert is stable during cutting, but the chip discharge space is insufficient and the depth of cut is limited
Solution Approach 1:
The invention removes the insert support portion from the holder that was previously supporting both sides of the insert during back-turning. By extracting this support function, the chip discharge space is freed up and expanded, allowing chips to be discharged smoothly without interference from the holder structure.
2Reliability
If the insert is mounted with the upper surface inclined at a negative angle, then the insert can be secured on the holder, but the chip discharge space becomes narrower and chip flow is poor
Solution Approach 1:
The invention employs asymmetric mounting where only one side of the insert is supported by a single insert support portion, rather than symmetric support on both sides. This asymmetric configuration optimizes the chip discharge space by eliminating the interfering support structure on the chip discharge side, while still providing sufficient mounting security through the single support point and proper positioning features.
3Strength
If the insert support portion supports both sides of the insert, then the insert is firmly held, but the arrangement of the cutting edge and chip former cannot be optimized for smooth chip discharge
Solution Approach 1:
The invention extracts the insert support portion from the holder design, removing the structural element that was interfering with chip discharge. This allows the cutting edge and chip former to be arranged optimally for smooth chip flow, while the insert is still firmly held through alternative mounting mechanisms such as the positioning recesses and clamping structure.
Data Source
AI summary
Embodiments of a cutting insert are provided. The cutting insert includes an upper surface, a lower surface, a plurality of side surfaces extending between the upper surface and the lower surface, an insert hole extending through the upper surface and the lower surface, and a corner portion provided with a cutting edge. At least one of the upper surface and the lower surface has a plurality of recesses extending between the insert hole and the corner portion. The plurality of recesses includes a first recess into which one portion of the mounting portion is inserted when the cutting insert is supported by the mounting portion, and a second recess into which another portion of the mounting portion is inserted when the cutting insert is supported by the mounting portion. The second recess has a side wall spaced apart from another portion of the mounting portion.