Circular-Arc Cutting Insert Seat Geometry to Prevent Shifting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cutting inserts with circular-arc-shaped cutting edges are prone to shifting during cutting, leading to potential damage and reduced machining accuracy, and existing solutions to prevent shifting often compromise the thickness around the cutting edge, making it susceptible to fracture.
Innovation Solution
A cutting insert design with inclined contact surface portions on the second end surface and corresponding inclined holding surface portions in the tool body's insert seat, which stabilize the insert during cutting by counteracting shifting forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flat portions are provided on the peripheral side surface to prevent rotation, then shifting suppression is improved, but the thickness around the cutting edge is reduced making it prone to fracture
Solution Approach 1:
The invention moves the contact surface from the peripheral side surface to the second end surface of the cutting insert. This dimensional relocation allows the contact surface to be positioned away from the cutting edge region, preventing thickness reduction at the cutting edge while still providing effective shifting suppression through the inclined contact surface geometry.
Solution Approach 2:
The contact surface is divided into multiple contact surface portions (first, second, third, fourth contact surface portions) arranged at different positions and orientations on the second end surface. This segmentation allows each portion to independently contribute to shifting suppression in different directions, achieving comprehensive stability without compromising cutting edge integrity.
2Reliability
If contact surface is provided on the peripheral side surface, then shifting suppression is improved, but separate rotation prevention configuration is needed increasing device complexity
Solution Approach 1:
The invention combines the functions of shifting suppression and rotation prevention into a single integrated contact surface structure on the second end surface. The inclined contact surface portions work together to simultaneously prevent both shifting and rotation, eliminating the need for separate rotation prevention configurations and reducing overall device complexity.
Solution Approach 2:
The contact surface portions on the second end surface serve multiple functions: they suppress shifting in the rotating direction, prevent rotation of the cutting insert, and maintain proper positioning during cutting. This multi-functionality eliminates the need for additional dedicated components for each function.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a cutting insert comprising first and second end surfaces, a peripheral side surface extending between the first and second end surfaces, and a cutting edge formed at least in part of an intersecting edge between the first end surface and the peripheral side surface. The cutting insert further comprises the cutting edge which includes at least one circular-arc-shaped cutting edge and a contact surface portion formed in the second end surface. When a reference axis (A) is defined as a line passing through a center of the first end surface and being perpendicular to the first end surface, and when a virtual circle is defined, as viewed from a direction facing the first end surface, so that the virtual circle includes, as its arc, a first circular-arc-shaped cutting edge which is one of the circular-arc-shaped cutting edges, a center (E) of the virtual circle is apart from the reference axis (A). Additionally, when a first reference plane (B) is defined as a plane including the reference axis (A) and extending through the center (E) of the virtual circle; a second reference plane (C) is defined as a plane extending perpendicularly to the reference axis (A) and arranged on the first end surface side with respect to the second end surface. A virtual plane (D) is defined as a plane orthogonal to both the first reference plane (B) and the second reference plane (C) and extending so as to intersect with the first circular-arc-shaped cutting edge and traverse the contact surface portion. The contact surface portion has, in the virtual plane (D), a portion which is inclined so as to gradually become more distant from the second reference plane (C) heading from one end to the other, wherein in a side view in which the cutting edge (5) which includes the first circular-arc-shaped cutting edge is viewed from a direction facing the virtual plane (D), the cutting edge (5) has an inclined portion which is inclined so as to form an acute angle with respect to the second reference plane (C); and the direction of inclination of the contact surface portion in the virtual plane (D) is the same as the direction of inclination which is obtained when the shape of the inclined portion of the cutting edge (5) in the side view is projected onto the virtual plane (D).