Super-hard Construction Spacer for Sintering Alignment
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Solution Overview
Problem
Existing methods for producing super-hard constructions, particularly for rotary machine tools, face challenges in achieving dimensional accuracy and preventing misalignment and distortion during the sintering process, which can lead to costly malformations and increased risk of cracking or de-lamination when brazed to a tool carrier.
Innovation Solution
A method involving a pre-sinter assembly with a spacer structure providing lateral support, using an ultra-high pressure and high temperature furnace to sinter a polycrystalline super-hard structure onto an elongate substrate, where the spacer structure is configured to maintain alignment and reduce stress, allowing for the formation of a blank body with a super-hard structure spaced apart from the substrate, facilitating easier processing and attachment to a tool carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing methods are used to produce super-hard constructions, then the sintering process can be completed, but misalignment and distortion occur leading to dimensional inaccuracy
Solution Approach 1:
A spacer structure made of material with high Young's modulus (at least 300 GPa, preferably at least 500 GPa) is introduced as an intermediary element between the substrate and the cavity wall. This spacer acts as a mediator that maintains precise spacing and alignment during the sintering process, preventing direct contact between the substrate and cavity wall that would cause distortion. The spacer structure ensures dimensional accuracy by providing lateral support and maintaining geometric stability throughout the high-pressure sintering operation.
2Ease of manufacture
If high pressure and temperature are applied during sintering, then the super-hard structure is formed, but deformation and misalignment increase
Solution Approach 1:
The spacer structure is positioned beforehand between the substrate and cavity wall to provide preemptive support against the high pressures (at least 5 GPa) and temperatures (at least 1000°C) applied during sintering. This prior cushioning prevents deformation before it can occur by distributing and absorbing the mechanical stress, allowing the sintering process to complete successfully while maintaining shape accuracy of the super-hard structure.
3Device complexity
If the super-hard structure is joined directly to the substrate, then the construction is complete, but cracking and de-lamination risk increases during brazing
Solution Approach 1:
The construction is segmented into distinct functional zones: the substrate, the super-hard structure, and the spacer structure that provides a transition zone between them. This segmentation allows the spacer structure to serve as a buffer that accommodates differential thermal expansion and stress during the brazing process, reducing the risk of cracking and de-lamination while maintaining overall construction integrity.
4Volume of moving object
If the super-hard structure is closely attached to the substrate, then the construction is compact, but processing difficulty and cost increase
Solution Approach 1:
The spacer structure is strategically positioned to extend beyond the super-hard structure at certain regions, creating accessible spaces that facilitate easier processing operations. This extraction of the spacer structure from the immediate interface zone allows for simplified machining, grinding, and assembly operations on the super-hard structure without the constraint of tight clearance, reducing manufacturing complexity and cost.
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 reduces the risk of deformation and misalignment during sintering, enabling the production of high-accuracy super-hard constructions that can be efficiently processed into rotary machine tool cutter elements with reduced risk of cracking or de-lamination during brazing, thus improving the economic viability of manufacturing super-hard rotary cutter elements.
Implementation Method 1
applying a force to the pre-sinter assembly and heating it to a temperature, the force being sufficient to generate a pressure within the vessel for sintering the aggregation at the temperature
Data Source
AI summary
A method of making a construction comprising a polycrystalline super-hard structure joined to a side surface of an elongate substrate. The method includes: providing a vessel configured for an ultra-high pressure, high temperature furnace, the vessel having an elongate cavity for containing a pre-sinter assembly and defining a longitudinal axis, the cavity having opposite ends connected by a cavity wall. The pre-sinter assembly comprises the substrate, an aggregation comprising a plurality of super-hard grains arranged over at least a part of the side surface of the substrate, and a spacer structure configured for spacing the substrate apart from the cavity wall. The spacer structure comprises material having a Young's modulus of at least 300 GPa. The method further includes inserting the pre-sinter assembly into the cavity, the substrate being substantially longitudinally aligned and the spacer structure arranged between the side surface of the substrate and the cavity wall; applying a force to the pre-sinter assembly and heating it to a temperature, the force being sufficient to generate a pressure within the vessel for sintering the aggregation at the temperature, and providing the construction.