Hearing Device Metal Shell Manufacturing with Sacrificial Elements
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Solution Overview
Problem
The existing methods for manufacturing metal shells for hearing devices face challenges in providing a readable identification label without occupying space and preventing grinding materials from entering the internal cavity, especially with harder materials like metals, and in ensuring the label does not damage functional components during assembly.
Innovation Solution
A method involving a 3D printing process using Selective Laser Sintering (SLS) to create a preform with a movable label and a protective element, where the label is attached externally and the protective element occupies the internal cavity, allowing for easy identification and preventing grinding materials from entering during surface smoothing, and both can be removed without interfering with the assembly of functional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an identification label is printed on the inside of the metal shell, then the shell can be identified, but the label occupies space and may damage functional components during assembly
Solution Approach 1:
The identification label is moved from the internal surface (2D plane inside the shell) to an external dimension (hanging outside the shell via chain), eliminating space occupation within the device while maintaining identification functionality
Solution Approach 2:
The label is separated from the main shell body and connected via a chain, allowing it to hang externally without interfering with internal components during assembly
2Manufacturing precision
If vibratory grinding is applied to smoothen the preform surface, then the surface quality is improved, but grinding materials enter the internal cavity and are difficult to remove
Solution Approach 1:
A protective element is placed inside the internal cavity before the vibratory grinding process to prevent grinding materials from entering, and then removed after grinding is complete
Solution Approach 2:
The protective element is a temporary, disposable component used only during the grinding process, then discarded after serving its protective function
3Reliability
If a plastic plug is pushed into the opening to protect the contour during tumbling, then the contour is protected, but this method is not applicable to harder materials like metals
Solution Approach 1:
A protective element made of metal-compatible material is used temporarily during the tumbling process to protect the opening contour, then removed after the process
Solution Approach 2:
The protective element's material properties are selected to be compatible with metal shells, unlike the plastic plugs used for plastic shells, demonstrating adaptability to different material hardness levels
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 method enables efficient and reliable manufacturing of metal shells with easily readable identification and prevents damage to functional components, ensuring accurate assembly and enhanced manufacturing processes without occupying space within the hearing device.
Implementation Method 1
A metal shell for the hearing device is produced from metal powder using the SLS process
Implementation Method 2
forming the preform by a 3D printing process, which is a Selective Laser Sintering (SLS) process
Implementation Method 3
The surface of the preform is then smoothened by vibratory grinding
Implementation Method 4
The surface of the preform is then smoothened by vibratory grinding
Data Source
Figure 1~2
Figure 3~4B
AI summary
The present invention provides a method for manufacturing a metal shell for a hearing device, the metal shell comprising a first opening and a second opening, wherein the second opening is smaller than the first opening, the method comprising: fabricating a preform of the metal shell, the preform comprising a main body defining an internal cavity and at least one sacrificial element formed on the main body, the main body having a first position where the first opening is located and a second position where the second opening is located; smoothening a surface of the preform; and finishing the preform to obtain the metal shell, characterized in that finishing the preform comprises removing the at least one sacrificial element. According to the present invention, it is possible to manufacture simply, efficiently and reliably the metal shell for the hearing device.