Muffle With Segmented Pressing Channels For Dental Ceramics
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Solution Overview
Problem
Ceramic dental restoration components often suffer from cracks and cavities due to air pockets and low pressing force, which impair their strength and quality, and existing muffles with specific cross-sections can lead to jamming of the press stamp.
Innovation Solution
A muffle design featuring a pressing channel with a large cross-section that accommodates multiple press blanks side by side, combined with a small connection channel to generate shearing forces that expel air pockets and improve material intermixing, along with a concave construction to reduce friction and facilitate smooth pressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a pressing channel with a particular cross-section is used to fill bulk material and press it into a ceramic dental restoration component, then the pressing force is distributed, but air pockets remain that cannot be completely eliminated
Solution Approach 1:
The pressing channel is divided into multiple pressing channels, each capable of receiving press blanks side by side. This segmentation allows the bulk material to be pressed from multiple directions simultaneously, improving air pocket elimination while maintaining efficient material utilization
Solution Approach 2:
The invention transitions from a single pressing channel to multiple pressing channels arranged in a specific configuration. This dimensional change allows material to be pressed from multiple directions, enabling better air pocket removal through multi-directional compression forces
2Quantity of substance
If a pressing channel with a particular cross-section is used, then bulk material can be filled, but the pressing force is comparatively low due to wall friction
Solution Approach 1:
The total pressing force is distributed across multiple pressing channels, each with its own press stamp. This segmentation reduces the wall friction per channel while maintaining the overall bulk material capacity, as each smaller channel has less contact surface area relative to the total pressing force applied
Solution Approach 2:
Multiple pressing channels are combined in a single muffle system, allowing the cumulative pressing force from all channels to act on the bulk material simultaneously. This merging maintains high overall pressing force while each individual channel experiences reduced wall friction
3Quantity of substance
If a pressing channel with a particular cross-section is used, then bulk material can be pressed, but the press stamp easily jams
Solution Approach 1:
The press stamp system is segmented into multiple smaller press stamps, each operating in its own pressing channel. This segmentation reduces the likelihood of jamming in each individual stamp while maintaining the ability to process bulk material through coordinated operation of all stamps
Solution Approach 2:
The pressing channel cross-section is designed with specific geometric characteristics that reduce friction and prevent jamming. The curved or optimized cross-sectional shape allows the press stamp to move more smoothly through the bulk material, reducing mechanical interference and jamming risks
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 design significantly reduces the formation of cracks and cavities in ceramic dental restoration components by ensuring thorough expulsion of air pockets and enhanced material intermixing, allowing for both small and large component production with improved quality and reduced jamming risks.
Implementation Method 1
when the melting of the grain boundaries of the blank material begins and the blank material is still quite viscous. Only if the blank material is quite thin fluid due to further melting
Implementation Method 2
The shearing forces are the larger, the larger is the cross-sectional area of the pressing channel in comparison to the cross-sectional area of the connection channel. Large shearing forces lead to the fact that air pockets in the molten blank material due to compression can migrate along the grain boundaries of the material, and are thus squeezed out of the material
Implementation Method 3
a pressing force is applied and the press blank is heated
Data Source
AI summary
The invention proposes a muffle with a pressing channel and at least one mold cavity that is coupled to the pressing channel via at least one connection channel. In this case, in order to increase the pressing pressure and to improve the intermixing of the blank material, it is proposed to arrange at least two blanks (18) side by side in the pressing channel (12).