Segmented Reamer Tool for Precision Hole Machining
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Solution Overview
Problem
Existing reamers face challenges in achieving high precision and accuracy in drilled hole machining due to misalignment and positional inaccuracies, which are exacerbated by the engagement of multiple cutting edges at the start of the machining process, leading to reduced process speed and quality.
Innovation Solution
A rotary tool with cutting edges arranged in two groups, where only the first group engages at a slow feed speed for initial alignment, and both groups engage at a higher speed, allowing for precise alignment and increased process speed by distributing cutting capacity across more edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple cutting edges are engaged at the start of machining, then cutting capacity is increased, but alignment precision deteriorates due to offset and oblique positioning
Solution Approach 1:
The cutting edges are divided into two distinct groups: a first group with fewer cutting edges for initial alignment, and a second group with more cutting edges for high-speed machining. This segmentation allows the tool to perform different functions at different stages of the machining process, resolving the contradiction between alignment precision and cutting capacity.
Solution Approach 2:
The first group of cutting edges performs preliminary alignment action at the start of machining when the tool is still establishing its position. After alignment is achieved, the second group of cutting edges engages to provide high cutting capacity for the remainder of the machining operation, ensuring both precision and productivity.
2Manufacturing precision
If slow feed speed is used for initial alignment, then alignment precision is improved, but process speed deteriorates
Solution Approach 1:
The machining process uses periodic action by switching between two feed speeds: a slow feed speed when the first group of cutting edges is engaged for alignment, and a fast feed speed when the second group of cutting edges is engaged for high-speed machining. This periodic variation in feed speed optimizes both precision and productivity at different stages.
Solution Approach 2:
The feed speed is made dynamic rather than constant, automatically adjusting based on which group of cutting edges is engaged. The control system dynamically switches between slow and fast feed speeds to match the operational requirements of each cutting edge group, resolving the contradiction between alignment precision and process speed.
3Productivity
If fast feed speed is used from the beginning, then process speed is improved, but alignment precision deteriorates due to offset and oblique positioning
Solution Approach 1:
The slow feed speed with the first group of cutting edges performs preliminary alignment action before high-speed machining begins. This preliminary action eliminates offset and oblique positioning issues, ensuring that when the fast feed speed is subsequently applied with the second group of cutting edges, the alignment precision is already established and maintained.
4Manufacturing precision
If fewer cutting edges are engaged, then alignment precision is improved, but cutting capacity deteriorates
Solution Approach 1:
The cutting edges are segmented into two functional groups: the first group with fewer cutting edges dedicated to precision alignment, and the second group with more cutting edges dedicated to high-capacity material removal. This segmentation ensures that each group optimizes for its specific function, resolving the contradiction between alignment precision and cutting capacity.
Solution Approach 2:
The rotary tool is designed with multi-functionality by incorporating two groups of cutting edges that can serve different purposes. The same tool can perform both precision alignment (first group) and high-speed machining (second group), making it a universal tool that addresses both contradictory requirements within a single device.
Data Source
AI summary
In order to achieve as highly accurate an alignment of the reamer as possible and therefore as high a drilled hole quality as possible during the precision machining of a drilled hole, the cutting edges of the reamer are divided into two cutting groups, the cutting edges of which are spaced apart with respect to one another in each case by an axial spacing from one another. Here, the axial spacing is selected in such a way that, at a predefined first, slower feed speed, merely the cutting edges of the first cutting edge group are in engagement with the workpiece and, at a higher, predefined second feed speed, all cutting edges are in engagement with the workpiece.