Spice mill part and method for producing a spice mill part
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Solution Overview
Problem
Conventional spice mills with ceramic milling elements face issues of hairline cracks and chipping due to floating mounting, leading to potential fractures and contamination of food with chipped parts during the milling process.
Innovation Solution
A force fit is achieved by clamping the ceramic milling element into the receiving element using a compressive force directed radially inward, ensuring full-surface contact and reducing the risk of cracks and chipping, with the receiving element's inner diameter being smaller than the milling element's outer diameter to secure the element in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner diameter of the receiving element is designed larger to accommodate manufacturing tolerances of ceramic milling elements, then the milling element can be reliably inserted into the receiving element, but the milling element becomes floatingly mounted which leads to hairline cracks and chipping during milling
Solution Approach 1:
The receiving element is pre-expanded before inserting the milling element, creating an interference fit that generates compressive forces on the milling element. This preliminary expansion action ensures that the milling element is firmly clamped from the outset, preventing floating mounting and the associated cracks and chipping during operation
Solution Approach 2:
The inner diameter of the receiving element is dynamically changed by expanding it before insertion and then allowing it to contract, creating a force fit. This parameter change transforms the mounting condition from a loose fit to a tightly clamped interference fit, eliminating the harmful effects of floating mounting
2Reliability
If the milling element is firmly clamped with compressive force, then the risk of cracks and chipping is reduced, but the insertion of the milling element into the receiving element becomes more difficult
Solution Approach 1:
The receiving element is pre-expanded to a larger diameter before the milling element is inserted, creating sufficient clearance for easy insertion. After insertion, the receiving element contracts to create the interference fit, thus achieving both easy insertion and firm clamping without contradiction
Solution Approach 2:
The receiving element's inner diameter is made dynamic rather than static - it expands during insertion to facilitate easy mounting, then contracts to create the force fit. This dynamic dimension change resolves the contradiction between ease of insertion and firm clamping
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 solution significantly reduces the risk of fractures and chipping, ensuring the integrity of the milling element and preventing contamination of food with chipped parts, thereby enhancing the reliability and safety of the spice mill.
Implementation Method 1
the receiving element (13) is produced in an expanded state in which the inner circumference of the receiving element (13) corresponds at least substantially to the outer circumference of the milling element (1)
Data Source
AI summary
A spice mill part, more particularly a spice mill lower part, for a spice mill, having a housing, which consists at least in part of a plastic material and which can be rotatably connected to a further spice mill part, more particularly a spice mill upper part. A receiving element is provided on the housing, in which receiving element there is arranged a milling element being particularly a milling ring, made from a ceramic material, with the milling element being clamped in the receiving element in a frictionally engaged manner by a compressive force directed substantially radially inwardly and acting on a self-contained outer bearing face of the milling element, the compressive force acting substantially along the entire circumference on the external bearing face of the milling element.