Radially Offset Milling Cutter for Simultaneous Roughing and Finishing
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Solution Overview
Problem
Current milling technologies for flat surfaces, such as the upper face of an internal combustion engine casing, require multiple operations for roughing and finishing, leading to reduced tool life and a risk of surface scratches due to uneven distribution of cutting edge loads.
Innovation Solution
A milling tool with radially offset cutting edges arranged on the same axial sector, allowing simultaneous roughing, intermediate finishing, and finishing on the same thickness of material, eliminating the need for multiple passes and reducing edge wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple machining operations (roughing and finishing) are performed separately, then surface quality can be maintained, but tool life is reduced and productivity decreases
Solution Approach 1:
The patent combines multiple machining operations (roughing, intermediate finishing, and final finishing) into a single machining pass by using a cutter with multiple rows of cutting edges at different radial positions. All rows machine the same thickness of material simultaneously, eliminating the need for multiple separate operations while maintaining surface quality and extending tool life.
Solution Approach 2:
The cutting tool is segmented into multiple rows of cutting edges, where each row is responsible for a specific machining function (roughing, intermediate finishing, final finishing). This segmentation allows each row to be optimized for its specific function while working simultaneously on the same workpiece, resolving the contradiction between productivity and surface quality.
2Productivity
If stepped cutters with multiple rows of cutting edges are used, then productivity increases by performing roughing and finishing in one operation, but tool life is reduced due to uneven load distribution
Solution Approach 1:
The patent applies local quality by positioning cutting edges at specific radial distances from the cutter axis, where each radial position is optimized for its specific machining function. The roughing edges are positioned to remove material efficiently, while finishing edges are positioned to produce the required surface quality. This localized optimization ensures even load distribution across all cutting rows, extending tool life while maintaining high productivity.
3Productivity
If snail cutters with axially offset edges are used, then the thickness removed in a single pass is increased, but the risk of surface scratches increases and tool life is reduced
Solution Approach 1:
The patent transitions from axial offset (snail cutter configuration) to radial offset (stepped cutter configuration). By arranging cutting edges at different radial distances from the axis while maintaining the same axial position, the invention achieves the benefit of removing significant thickness in a single pass while eliminating the harmful effect of surface scratches that occurs with axially offset edges.
Data Source
AI summary
The invention relates to a method for milling a planar surface, during which a milling cutter, the axis of rotation of which is perpendicular to the surface to be machined, is moved in a direction parallel to the plane of the surface, so as to machine the surface in a single machining operation, over a predetermined layer of material, using a single milling head, wherein the milling cutter, in the same axial position relative to the surface to be machined, simultaneously carries out rough working, at least one intermediate finishing operation, and a finishing operation over the same layer of material.