Workpiece Unit Positioning Mechanism for Dental Prosthetic Accuracy
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Solution Overview
Problem
In the production of dental prosthetic materials, accurately attaching a holding member to a workpiece body is challenging due to displacement issues during machining, transportation, and storage, leading to inaccuracies in shaping the workpiece.
Innovation Solution
A workpiece unit with a workpiece body featuring a first positioning portion and a holding member with a second positioning portion, allowing precise attachment and minimizing displacement through a fitting mechanism, either with or without adhesive material, to ensure accurate machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a holding member is attached onto a smooth circumferential portion of a workpiece body via adhesive material, then the workpiece body can be fixed onto the machining apparatus, but the holding member cannot be accurately attached to the predetermined position, causing position displacement
Solution Approach 1:
Positioning portions (protrusions and recesses) are pre-formed on the workpiece body and holding member before attachment. These positioning features guide the holding member to the predetermined position during attachment, eliminating the need to rely solely on adhesive placement accuracy on smooth surfaces.
Solution Approach 2:
Positioning portions act as intermediary elements between the workpiece body and holding member. The protrusion and recess features mediate the attachment process by providing mechanical guidance and constraint, ensuring accurate positioning independent of adhesive application precision.
2Strength
If a holding member is attached onto a workpiece body, then the workpiece body can be held during machining, but the holding member may displace due to environment or load during machining, transportation, storage and the like
Solution Approach 1:
The positioning portions utilize asymmetric geometric features (protrusion and recess) that provide directional constraint. This asymmetric design prevents displacement in critical directions while maintaining attachment strength, addressing the instability caused by environmental and loading conditions.
Solution Approach 2:
The positioning features are pre-integrated into the structure of the workpiece body and holding member. This preliminary incorporation of positioning constraints ensures that stability is built into the attachment design itself, rather than relying solely on adhesive bonds that may fail under varying environmental conditions.
Data Source
AI summary
Provided are: a workpiece unit (10) that makes it possible to attach a holding member (1) to a workpiece body (1) at a suitable position and that minimizes displacement of the holding member (2) after attachment thereof; and a method for producing the workpiece unit (10). The workpiece unit (10) is provided with a workpiece body (1) and a holding member (2) arranged on at least a part of the outer circumference (1c) of the workpiece body (1). The workpiece body (1) comprises at least one first positioning section (1d) at a part facing the holding member (2). The holding member (2) comprises a second positioning section (2d) that engages with at least a part of the first positioning section (1d).