Shoulder Milling Cutter Geometry to Prevent Profile Edge Chipping
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Solution Overview
Problem
Milling brittle materials like gray cast iron results in material chipping at the profile edge, which compromises the integrity of the workpiece, and existing methods require multiple milling steps to prevent this, leading to prolonged process times.
Innovation Solution
A milling tool with a combination of base and shoulder milling cutters, featuring a divided shoulder milling cutting edge into a main and secondary cutting edge, aligned perpendicularly and axially spaced, to minimize material removal and prevent chipping, allowing a single-step process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple milling steps are used to prevent material chipping, then material chipping is prevented, but process time increases
Solution Approach 1:
The shoulder milling cutting edge is divided into two distinct parts: a main cutting edge for primary material removal and a secondary cutting edge for finishing. This segmentation allows each edge to perform its specific function optimally, preventing material chipping while maintaining efficient material removal rates, thereby eliminating the need for multiple milling steps
Solution Approach 2:
The patent combines the functions of multiple milling operations into a single milling tool by integrating both main and secondary cutting edges on the same tool. This merging allows the tool to perform both roughing and finishing operations in one pass, preventing material chipping without requiring separate milling steps
2Productivity
If a single milling step is used to reduce process time, then process time is reduced, but material chipping occurs
Solution Approach 1:
The shoulder milling cutting edge is segmented into main and secondary cutting edges with distinct functions. The main cutting edge handles aggressive material removal while the secondary cutting edge provides a finishing pass that prevents material chipping, enabling single-step milling to achieve both high productivity and workpiece integrity
Solution Approach 2:
Different portions of the cutting edge are designed with different properties: the main cutting edge is optimized for material removal rate while the secondary cutting edge is optimized for surface quality and chip prevention. This local differentiation allows the single tool to address both productivity and reliability requirements
Data Source
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AI summary
The invention relates to a milling tool (1), which produces at least one workpiece shoulder (5) on a workpiece surface in a milling process, the workpiece shoulder having a workpiece bottom (7), which transitions, at an inside corner (9), into a shoulder surface (11) raised therefrom. In particular in the milling process, an axis of rotation (R) of the milling tool (1) is oriented at a right angle to the workpiece bottom (7). According to the invention, the milling tool (1) has, at its tool end face (21), at least one bottom-milling cutting edge (17) running perpendicularly to the axis of rotation (R), for the milling of the workpiece bottom (17). For the milling of the workpiece shoulder surface (11), the milling tool (1) has at least one shoulder-milling cutting edge, which runs along the axis of rotation (R). The shoulder-milling cutting edge is divided into a shoulder-milling main cutting edge (23) and a shoulder-milling secondary cutting edge (25).