Green Body Particle Placement for Dry Concrete Machining Segments
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Solution Overview
Problem
Machining tools designed for wet machining of concrete materials produce abrasive sludge that leads to self-sharpening, while those for dry machining suffer from dulling hard material particles and slow matrix wear, resulting in reduced machining rate and service life.
Innovation Solution
The method involves building a green body with hard material particles placed in depressions of a press punch, applying matrix material on top, and using protective layers to prevent direct contact, allowing for precise particle arrangement and reduced press punch wear, suitable for dry machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hard material particles are placed directly on the press punch for building the green body, then the machining rate is improved, but the press punch wears quickly
Solution Approach 1:
A protective layer made of matrix material is introduced between the hard material particles and the press punch. This intermediary layer prevents direct contact and wear on the press punch while still allowing the hard material particles to be properly positioned in depressions for optimal machining performance.
2Ease of manufacture
If hard material particles are randomly distributed in the matrix material, then the manufacturing process is simple, but the machining precision and particle arrangement control are poor
Solution Approach 1:
Depressions are pre-formed in the matrix material before the hard material particles are placed. This preliminary action guides the particles into specific positions, ensuring accurate particle pattern arrangement while maintaining a relatively simple manufacturing process.
Solution Approach 2:
The matrix material acts as an intermediary medium that holds the hard material particles in the desired pattern. By forming depressions in this intermediary material, precise particle arrangement is achieved without complex positioning mechanisms.
3Reliability
If the matrix material and hard material particles have similar wear rates (as in wet machining tools), then the self-sharpening effect occurs in wet machining, but in dry machining the matrix material wears too slowly and hard material particles become dull
Solution Approach 1:
The machining segment is designed with different zones having different properties: a machining zone with hard material particles for cutting and a neutral zone with different matrix material for support. This local differentiation optimizes performance for dry machining by ensuring proper wear characteristics in the machining zone while maintaining structural integrity.
Solution Approach 2:
The machining segment uses a composite structure combining matrix material and hard material particles in specific ratios and arrangements. This composite design allows optimization of wear characteristics for dry machining conditions, where the matrix material wears at a controlled rate to expose fresh hard material particles without becoming too dull.
Data Source
AI summary
A method for producing a green body for a machining segment, where the machining segment is connectable to a basic body of a machining tool by an underside of the machining segment, includes placing first hard material particles in respective depressions of a first press punch in a defined particle pattern and applying a first matrix material to the placed first hard material particles.