Workpiece Unit Protruding Edge Reinforcement
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Solution Overview
Problem
The existing methods for machining circular plate-shaped workpieces, such as dental prostheses, result in weak outer edges due to processing techniques that leave thin edges, leading to potential fractures and increased manufacturing costs due to excessive material usage.
Innovation Solution
A workpiece unit with a protruding portion and a holding member on its outer side is used, enhancing the strength of the outer edge and reducing material usage by allowing a smaller diameter, thus minimizing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the workpiece body is processed to areas close to its outer edge to utilize the workpiece body without waste, then the material utilization rate is improved, but the strength of the outer edge portion deteriorates due to thinning
Solution Approach 1:
The workpiece body is segmented into two functional regions: a processed area containing the prosthesis and an unprocessed outer edge portion serving as a reinforcing frame. This segmentation allows the outer edge to maintain its original thickness and strength while the inner area is fully processed, resolving the contradiction between material utilization and edge strength.
Solution Approach 2:
The outer edge portion is predetermined to remain unprocessed during machining operations. This preliminary decision to leave the outer edge intact creates a natural reinforcing frame before any damage can occur, preventing fracture while maximizing the processed area of the workpiece.
2Strength
If a ring is used to hold the workpiece body to the processing apparatus, then the strength of the outer edge portion is improved, but the manufacturing cost increases due to additional components
Solution Approach 1:
The workpiece body performs its own reinforcing function through its unprocessed outer edge portion, eliminating the need for external rings or additional holding components. The structure is self-sufficient, using its own geometry to provide the necessary strength and rigidity during processing.
Solution Approach 2:
The unprocessed outer edge portion serves multiple functions simultaneously: it acts as a structural reinforcing frame, provides rigidity during machining, and serves as the interface for mounting to the processing apparatus. This multi-functionality eliminates the need for separate rings or holding devices.
3Manufacturing precision
If the attachment position of the workpiece body shifts in the lateral direction, then the positioning accuracy deteriorates, but the same problem of thin outer edge portion occurs
Solution Approach 1:
The unprocessed outer edge portion acts as a cushion or buffer zone that compensates for potential positioning shifts during attachment. Even if lateral displacement occurs, the reinforced outer edge maintains sufficient thickness and strength to prevent fracture, providing a safety margin against positioning errors.
Data Source
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AI summary
Provided is a workpiece unit that makes it possible to maintain the strength of a workpiece body while reducing the amount of raw material used for the workpiece body. The workpiece unit comprises a workpiece body having a protruding portion; and a holding member arranged on at least a part of an outer side of the protruding portion.