Ceramic Surgical Instrument Grinding Process
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Solution Overview
Problem
Existing methods for manufacturing ceramic surgical and dental instruments lack sufficient dimensional stability, especially when these instruments rotate at high speeds, due to inadequate surface roughness and processing techniques.
Innovation Solution
A method involving sequential rough and fine grinding using grinding tools with specific grain sizes (40 μm to 110 μm and 20 μm to 50 μm) to process ceramic materials for surgical and dental instruments, ensuring high quality and efficiency without damaging the material, and allowing for various shapes and connections between ceramic and metallic parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional grinding methods are used on ceramic materials, then manufacturing simplicity is maintained, but manufacturing precision and surface finish are insufficient for high-speed rotation applications
Solution Approach 1:
The grinding process is divided into two distinct stages: rough grinding with coarse-grained wheels (40-110 μm) to remove material quickly and establish basic geometry, followed by fine grinding with fine-grained wheels (20-50 μm) to achieve the required surface finish and dimensional precision. This segmentation allows each stage to be optimized independently, resolving the contradiction between precision and complexity.
Solution Approach 2:
The invention changes the grain size parameter of the grinding wheel as a function of the processing stage and material hardness. For softer ceramic materials, coarser grains (40-110 μm) are used in rough grinding, while finer grains (20-50 μm) are used in fine grinding. For harder materials, the grain size range is adjusted accordingly. This parameter adaptation optimizes both precision and process efficiency without excessive complexity.
2Productivity
If high-speed rotation is implemented for ceramic surgical instruments, then productivity is improved, but dimensional stability deteriorates due to insufficient surface finish
Solution Approach 1:
The fine grinding operation is performed as a preliminary action before the ceramic instrument is subjected to high-speed rotation during actual surgical use. This preliminary fine grinding establishes the required surface finish (Ra ≤ 0.8 μm) and dimensional stability in advance, ensuring that the subsequent high-speed operation does not compromise the instrument's precision or cause premature wear.
3Productivity
If coarse grinding is used to remove material quickly, then productivity is improved, but manufacturing precision deteriorates due to poor surface finish
Solution Approach 1:
The grinding operation is segmented into rough grinding and fine grinding stages. Rough grinding uses coarse-grained wheels (40-110 μm) to remove material quickly with high productivity, accepting a poorer surface finish. Fine grinding then uses fine-grained wheels (20-50 μm) to correct the surface finish and achieve the required precision. This segmentation allows both high productivity and high precision to be achieved sequentially.
Solution Approach 2:
The two-stage grinding process represents a continuous useful action where the output of the first stage (rough grinding) directly feeds into the input of the second stage (fine grinding). There is no interruption or waste between stages, and each stage builds upon the previous one to progressively improve both productivity and precision throughout the overall manufacturing process.
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
This approach ensures high-quality, cost-effective manufacturing of surgical and dental instruments with improved dimensional stability and surface finish, suitable for high-speed applications, while allowing for versatile design and material combinations.
Implementation Method 1
a rough grinding using a grinding tool having a grain size between 40 μm and 110 μm... and subsequently a fine grinding of the cutting edges using a grinding tool having a grain size between 20 μm and 50 μm
Data Source
AI summary
The invention relates to a method of manufacturing a surgical instrument having a rotatable shaft 2 and a working part 1 disposed thereon, the working part having at least one cutting edge, wherein the shaft 2 and the working part 1 are made of oxide ceramics, characterized in that for the manufacturing of the contour of the instrument, a rough grinding using a grinding tool having a grain size between 40 μm and 110 μm is performed, and subsequently, a fine grinding of the cutting edges using a grinding tool having a grain size between 20 μm and 50 μm performed.