Reversible Cutting Insert Structure for Stable Four-Sided Reuse
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Solution Overview
Problem
Existing end mills require two cutting inserts of different shapes for center and outer peripheral edges, complicating tool management and limiting the reuse of cutting inserts due to asymmetric, complex front and back surfaces.
Innovation Solution
A cutting insert with interchangeable first and second end surfaces, where both surfaces have identical rectangular edge lines with cutting edges on three sides and no cutting edge on one side, allowing the same insert to be used as both center and outer peripheral edges, and featuring a wiper cutting edge for smoothing surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two different shaped cutting inserts are used for center edge and outer peripheral edge, then the drilling function is achieved, but the tool management becomes complicated and the cutting insert cannot be reused
Solution Approach 1:
The cutting insert is designed with a symmetric structure where the front and back surfaces have identical rectangular edge lines with cutting edges on three sides. This allows the same cutting insert to function as both center edge and outer peripheral edge, eliminating the need for different shaped inserts and enabling reuse after flipping the insert.
2Productivity
If asymmetric complex shaped cutting insert is used, then the cutting function is optimized, but the front and back surfaces cannot be interchanged for further use
Solution Approach 1:
The patent applies symmetry principle (opposite of asymmetry) by designing the cutting insert with identical rectangular edge lines on both front and back surfaces. Each edge line has cutting edges on three sides and no cutting edge on one side, allowing the insert to be flipped and reused while maintaining cutting functionality.
3Adaptability or versatility
If the cutting insert is designed with identical rectangular edge lines on both surfaces, then the insert can be reused four times, but the fixation stability must be ensured
Solution Approach 1:
While the overall edge line pattern is symmetric, the patent introduces asymmetric features within each surface - specifically the inclined fourth side surface that creates a wedge shape at one end. This asymmetric inclination provides directional fixation stability when the insert is mounted, ensuring reliable attachment while maintaining the ability to flip and reuse the insert.
Data Source
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AI summary
The present disclosure provides a cutting insert that is economical and can be stably fixed to a tool body. A first edge line (10R) of a cutting insert (2) is a rectangle having a first side (11) and a third side (13) as long sides and a second side (12) and a fourth side (14) as short sides. Cutting edges are formed at the first side (11), the second side (12) and the third side (13); on the other hand no cutting edge is formed at the fourth side (14). At a second edge line (20R) having the same shape as the first edge line (10R), a sixth side (22) where a cutting edge is formed is opposite to the fourth side (14), and an eighth side (24) where a cutting edge is not formed is opposite to the second side (12). A peripheral side surface (30) includes a fourth side surface (34) facing the fourth side (14) and the sixth side (22). The fourth side surface (34) extends from a first end surface (10) to a second end surface (20) and is inclined in a direction from the second side (12) to the fourth side (14).