Adhesive-Free Workpiece Holding Ring for Thin-Edge Machining
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Solution Overview
Problem
In machining processes, especially for dental prostheses, the use of adhesives to attach holding members to workpiece bodies can lead to stress transmission due to thermal expansion differences, causing breakage and making removal difficult, as the outer edge of the workpiece body becomes thin and weak.
Innovation Solution
A method involving a holding member that directly contacts the outer circumferential portion of the workpiece body without adhesives, where the holding member is expanded by heating and contracted by cooling to securely attach to the workpiece body, preventing stress transmission and facilitating easy removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a holding member is attached to a workpiece body via an adhesive, then the holding member can be securely fixed to the workpiece body, but stress from thermal expansion differences is transmitted to the workpiece body causing breakage
Solution Approach 1:
The invention extracts and removes the adhesive layer from the attachment system. By directly contacting the workpiece body without adhesive, the source of stress transmission during thermal expansion is eliminated, preventing workpiece body breakage while maintaining secure holding through direct mechanical contact
Solution Approach 2:
The invention introduces a protrusion portion as an intermediary structural feature between the holding member and workpiece body. This protrusion portion provides mechanical interlocking and direct contact points that enable secure attachment without requiring adhesive, thereby eliminating the thermal expansion stress transmission pathway
2Strength
If a holding member is attached to a workpiece body via an adhesive, then the holding member can be securely fixed, but the holding member becomes difficult to remove from the workpiece body
Solution Approach 1:
The invention extracts and removes the adhesive layer that causes permanent bonding. By using direct mechanical contact through the protrusion portion without adhesive, the holding member can be securely fixed during machining and easily removed afterward without residue or damage, enabling both secure attachment and simple removal
Solution Approach 2:
The invention creates a dynamic attachment system where the holding member can transition between secured and removed states. The protrusion portion provides sufficient mechanical engagement for secure holding during operation, while allowing easy disengagement when removal is needed, adapting to different operational phases
3Productivity
If the outer edge portion of a workpiece body is left thin after machining, then the workpiece body can be worked close to the outer edge reducing waste, but the outer edge portion becomes weak in strength
Solution Approach 1:
The invention segments the workpiece body by creating a protrusion portion that separates the functional machining area from the holding area. This allows the main body to be machined close to the outer edge for maximum material utilization, while the protrusion portion remains as a separate structural element providing strength and serving as the attachment point for the holding member
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 prevents breakage by eliminating stress from thermal expansion differences and allows for easy removal of the holding member, reducing production costs and improving the durability of the workpiece body.
Implementation Method 1
expanding the holding member by heating, inserting the workpiece body into the ring of the holding member, and mounting the holding member at the outer circumferential portion of the workpiece body by contracting the holding member by cooling
Data Source
AI summary
Disclosed herein is a workpiece unit containing a workpiece body, and a holding member which is arranged at least at a part of an outer circumferential portion of the workpiece body and directly contacts with at least a part of the outer circumferential portion.