Reamer Guide Bevel Geometry to Prevent Feed Marks
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Solution Overview
Problem
Existing reaming tools often produce feed marks and have reduced service life due to uneven frictional contact and increased forces at the transition area between main and secondary cutting edges, leading to suboptimal surface quality and tool durability.
Innovation Solution
A reaming tool design with a secondary cutting edge that widens continuously towards the main cutting edge, creating a larger contact area and allowing for plastic deformation of the workpiece material, which enhances friction and reduces feed marks, and includes a radially widened guide chamfer to absorb forces and improve tool longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the secondary cutting edge has a constant width along its length, then the tool structure is simple and easy to manufacture, but feed marks are produced and surface quality deteriorates due to uneven frictional contact in the transition area
Solution Approach 1:
The patent applies local quality by varying the width of the secondary cutting edge along its length. The secondary cutting edge has a greater width at the transition area to the main cutting edge compared to other areas. This localized dimensional change creates improved frictional contact specifically where needed, eliminating feed marks and enhancing surface quality without complicating the overall tool structure
2Manufacturing precision
If the main and secondary cutting edges are angled to each other, then the reaming tool can perform fine machining, but increased forces occur at the transition area leading to reduced tool service life
Solution Approach 1:
The patent addresses the service life issue by applying local quality to the secondary cutting edge width. By increasing the width at the transition area, the patent distributes and reduces the forces that occur during angled cutting operations. This localized reinforcement prevents excessive stress concentration at the critical transition zone, thereby extending tool service life while maintaining fine machining capability
Solution Approach 2:
The widened secondary cutting edge at the transition area acts as a beforehand cushioning measure. The increased width provides additional structural support and force distribution in advance of the high-stress transition zone, preventing premature tool failure before it can occur during operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design results in a smoother workpiece surface and extended tool service life by increasing material contact and plastic deformation, preventing feed marks and allowing for high-speed machining without chip removal issues.
Implementation Method 1
increasing material contact and plastic deformation, preventing feed marks
Implementation Method 2
allowing for plastic deformation of the workpiece material, which enhances friction
Data Source
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AI summary
The invention relates to a reamer tool (10) for finely machining bores, having a tool head (28) with at least one radially protruding cutter bar (100, 102) which comprises a main cutter (30, 42) and an auxiliary cutter (32, 48), in particular a guide bevel. The main cutter (30, 42) is oriented at an angle relative to the auxiliary cutter (32, 48), and the auxiliary cutter (32, 48) has an auxiliary cutter bevel (16, 54). According to the invention, the width of each auxiliary cutter bevel (16, 54) increases in the angled region in the axial direction of the tool head (28) end face from the auxiliary cutter (32, 48) to the main cutter (30, 42) and is expanded in the angled region in the direction of the tool head (28) end face in a continuous manner, in particular in a radial, curved, linear, or parabolic manner.