Cutting Insert With Inclined Support Surfaces For Milling Square Shoulders
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Solution Overview
Problem
Existing cutting inserts for milling square shoulders face challenges in providing stable support and longevity due to uneven force distribution and potential damage during machining, particularly at higher cutting depths and with increased radial cutting forces.
Innovation Solution
The cutting insert features inclined support surfaces with varying angles relative to the bottom surface, allowing for increased distance between the support line and the bottom surface, which enhances radial support and reduces the risk of lift-out during milling, while also providing necessary clearance and protection from material collision, and includes a cambered major cutting edge for smooth wall production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the cutting insert uses flat and non-coplanar support surfaces to press against larger faces in the insert pocket, then the insert stability in the pocket is improved, but the radial support capability under increased cutting depth and forces deteriorates
Solution Approach 1:
The support surfaces are designed with different inclinations relative to the normal of the bottom surface. The first support surface has a smaller inclination angle optimized for radial force support, while the second support surface has a larger inclination angle. This local differentiation allows each support surface to be optimized for its specific function, resolving the contradiction between overall stability and localized force support capability.
Solution Approach 2:
The cutting insert employs asymmetric support surfaces where the first and second support surfaces make different angles with the normal to the bottom surface. This asymmetric design breaks the symmetry of force distribution, allowing the insert to better handle the asymmetric radial cutting forces that occur during milling operations, particularly at increased cutting depths.
2Manufacturing precision
If the major cutting edge is inclined at a larger angle with respect to the bottom surface, then the quality of the vertical wall created is improved, but the radial support capability deteriorates
Solution Approach 1:
The solution moves the support problem from the cutting edge geometry to a separate support surface geometry. By introducing inclined support surfaces that extend from the cutting edge toward the bottom surface, the radial support function is separated from the wall-quality function. This allows the major cutting edge to maintain its optimal large inclination for vertical wall quality while the support surfaces provide the necessary radial support through their own optimized angles.
3Productivity
If the cutting insert is designed for increased cutting depth, then the productivity is improved, but the risk of insert lift-out and damage increases
Solution Approach 1:
The support surfaces are designed to engage with the insert pocket before the cutting operation begins. By pre-establishing the support geometry with optimally inclined surfaces, the insert is prepared to withstand the increased radial forces that will occur during deep cutting operations. This preliminary structural arrangement prevents lift-out and damage during high-productivity cutting operations.
Data Source
AI summary
A cutting insert for milling square shoulders has side surfaces each provided with a major cutting edge connected to an associated wiper edge on an adjacent side surface of the insert. The side surface provided with the major cutting edge has two generally flat and non-coplanar support surfaces arranged consecutively with respect to a direction of the extension of the major cutting edge and make different angles with a normal to a bottom surface of the insert. A border forming a limit of the support surfaces most distant to the bottom surface is inclined with respect to the bottom surface so that the distance of this border to the bottom surface increases in a direction of extension of the cutting edge towards the wiper edge.