Abrasive Tool Dual-Layer Backing for Contoured Surface Machining
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Solution Overview
Problem
Conventional abrasive tools require multiple passes and tools to achieve smooth machining of contoured surfaces, leading to inefficiencies, potential edge damage, and increased operational complexity, especially for untrained operators.
Innovation Solution
An abrasive tool with a dual-layer structure, where a less yielding second layer with higher stretch modulus supports an abrasive layer, allowing for optimal material removal while the more deformable first layer follows the surface profile, enabling single-pass machining without undulations and edge damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a hard or medium backing pad is used for initial machine roughing, then material removal efficiency is improved, but surface precision deteriorates due to formation of undulations and steps
Solution Approach 1:
The backing pad is segmented into multiple layers with different rigidity characteristics. The first layer (contacting workpiece) has lower rigidity to follow surface contours and prevent undulations, while the second layer (intermediate) has higher rigidity to support material removal. This segmentation allows each layer to perform its specific function optimally.
Solution Approach 2:
The backing pad uses a composite structure combining materials of different rigidity. The first layer uses softer material (e.g., foam with lower density) to conform to contoured surfaces, while the second layer uses stiffer material (e.g., foam with higher density or rigid substrate) to provide structural support for effective abrasion.
2Manufacturing precision
If a soft backing pad is used to avoid surface undulations, then surface precision is improved, but productivity deteriorates due to inadequate material removal
Solution Approach 1:
The backing pad is divided into functional layers: the first layer (soft) contacts the workpiece to prevent undulations, while the second layer (rigid) provides the structural support needed for effective material removal. This segmentation resolves the contradiction by assigning different rigidity requirements to different layers.
Solution Approach 2:
The composite structure combines soft and rigid materials in a layered configuration, allowing the soft outer layer to ensure surface precision while the rigid inner layer maintains productivity through adequate material removal capability.
3Manufacturing precision
If manual roughing with pre-shaped or flexible pads is performed, then surface precision is improved, but device complexity and execution time increase
Solution Approach 1:
The multi-layer backing pad design provides a universal solution that can be used for both machine roughing and finishing operations on contoured surfaces. A single tool design replaces the need for multiple specialized tools (pre-shaped pads, flexible pads, intermediate soft layers), simplifying the overall process while maintaining surface precision.
4Ease of operation
If conventional backing pads are used for contoured surfaces, then ease of operation is maintained, but harmful factors increase due to edge damage
Solution Approach 1:
The first layer of the backing pad has locally optimized properties (lower rigidity, higher conformity) specifically at the contact surface to follow contoured geometry and protect edges. This local quality adjustment prevents edge damage while maintaining ease of operation on complex surfaces.
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
Enables efficient, single-pass surface machining without undulations, reduces operational complexity, and minimizes edge damage, regardless of operator experience, using a tool that can be easily set up and maintained.
Implementation Method 1
the first layer (4) is made of a material which is deformable as a function of stresses applied at right angles to the arrangement of such layer... the second layer (5) has a greater stretch modulus than that of the first layer (4) with respect to stresses which are substantially at right angles to the plane of arrangement of such layers
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An abrasive tool (1) for machining surfaces, which comprises a support (2) associated with at least one abrasive layer (3), and a first layer (4) and a second layer (5), both of which are made of elastically deformable material and are interposed between said support (2) and said abrasive layer (3); the second layer (5) has a higher stretch modulus than the first layer (4) and is arranged in an intermediate position between the first layer (4) and the abrasive layer (3), and the first layer (4) is associated with the support (2).