Audio Transducer Diaphragm Forming for Uniform Sidewall Thickness
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Solution Overview
Problem
Conventional metal speaker diaphragm forming processes often result in unsuitable thickness variations and a higher likelihood of tearing due to material stress near the center, leading to suboptimal acoustic performance.
Innovation Solution
A method involving a workpiece with a center aperture formed between a first and second forming tool, where the workpiece is compressed to deform and form a transducer diaphragm with a generally elliptical or frusto-conical shape, increasing the center aperture diameter and maintaining a predetermined percentage of thickness variation in the sidewall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional metal speaker diaphragm is formed by stamping a sheet metal blank into a frustum shape and punching a center hole, then the diaphragm can be manufactured with a center aperture, but the material near the center experiences stretching and stress resulting in large thickness variations and increased likelihood of tearing
Solution Approach 1:
The patent applies preliminary action by forming the center aperture through the entire blanking process rather than punching it out after forming. The die is designed with a center aperture that allows material to flow through during forming, preventing the material stress and thickness variation problems that occur when a center hole is punched out after the cone is formed.
Solution Approach 2:
The patent changes the forming parameters by using a specific die geometry with a center aperture and controlled material flow paths. The die design includes features such as grain flow direction control and progressive forming stages that maintain material integrity while achieving the desired frustum shape with uniform wall thickness.
2Productivity
If a conventional metal speaker diaphragm is formed by stamping and punching, then the manufacturing process is simple and fast, but the diaphragm exhibits unsuitably large thickness variations and increased likelihood of tearing
Solution Approach 1:
The patent integrates the center aperture formation into the initial blanking and forming operation, eliminating subsequent punching steps. This preliminary action maintains high productivity while preventing material stress concentration and tearing that would compromise diaphragm reliability.
Solution Approach 2:
The patent optimizes forming parameters including die geometry, material flow control, and grain direction management to achieve uniform wall thickness throughout the forming process. These parameter changes prevent material thinning and stress concentration, thereby improving diaphragm durability without reducing manufacturing efficiency.
3Shape
If material is stretched and stressed near the center during conventional forming, then the center aperture can be created, but the cone sidewall develops large thickness variations
Solution Approach 1:
The patent forms the center aperture as part of the initial die geometry rather than creating it through subsequent material removal. This preliminary action allows material to flow uniformly around the center aperture during forming, maintaining consistent wall thickness while achieving the required center opening.
Solution Approach 2:
The patent employs specific die design parameters including aperture size, die cavity geometry, and material flow path optimization to control material distribution. These parameter changes ensure uniform material flow and consistent wall thickness around the center aperture, eliminating the thickness variations that occur with conventional punching methods.
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 sidewall thickness variations and minimizes the risk of tearing, resulting in improved acoustic performance and durability of the transducer diaphragm.
Implementation Method 1
deforming the workpiece and forming the transducer diaphragm
Implementation Method 2
compressing the workpiece therebetween, thereby deforming the workpiece
Data Source
Figure 1
Figure 2A~2B
Figure 3~8
AI summary
Systems and methods of forming transducer diaphragms are disclosed herein. In one embodiment, a method of producing a transducer diaphragm includes receiving a workpiece between a first forming tool and a second forming tool. The workpiece can have an inner boundary defining a central aperture. The workpiece with the aperture is compressed between the first and second forming tools to form the transducer diaphragm.