Bead Iron Geometry for Resharpenable Precision Prong Machining
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Solution Overview
Problem
Existing bead irons for processing jewelry holding arms have conical tips that cannot be resharpened, limiting precision and increasing material waste during post-processing, and hinder visibility and handling due to their shape.
Innovation Solution
A bead iron with a cylindrical shaft and a head featuring a cylindrical section and a transition portion, allowing for regrinding without changing the tip diameter, and a conical recess for precise machining, enabling improved visibility and reduced material loss during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conical tip is used on the bead iron, then the tool can be used for machining holding arms, but the tip cannot be resharpened and the diameter changes, preventing precise machining
Solution Approach 1:
The head is segmented into a cylindrical section and a conical working section. The cylindrical section maintains a constant diameter for precise positioning and clamping, while the conical section provides the machining function. This segmentation allows the cylindrical portion to serve as a stable reference that can be reground without affecting the precision, while the conical tip can be replaced or reground independently.
Solution Approach 2:
The invention transitions from a purely conical geometry to a composite geometry combining cylindrical and conical sections. This dimensional change adds a cylindrical reference surface that provides a stable basis for regrounding, separating the positioning function (cylindrical) from the machining function (conical).
2Manufacturing precision
If a conical tip is used on the bead iron, then the tool can machine holding arms, but the conical shape restricts the view of the workpiece and handling
Solution Approach 1:
By separating the head into cylindrical and conical sections, the narrow cylindrical portion provides a streamlined profile that improves visibility and access to the workpiece, while the conical working section remains functional for machining. The segmented design reduces the overall bulk near the tip area.
3Ease of operation
If a hollow drill is used to reground prongs after bending, then the prongs can be processed, but material consumption increases
Solution Approach 1:
The bead iron with cylindrical shaft and conical head is designed to perform multiple functions: initial shaping of holding arms, precise regrounding of bent prongs, and finishing work. This multi-functional tool replaces the need for separate hollow drill operations, reducing material removal and processing steps.
4Duration of action of stationary object
If the bead iron tip is reground, then the service life is extended, but the diameter of the tip changes, affecting precision
Solution Approach 1:
The head is divided into a cylindrical section with constant diameter and a conical working section. When regrounding is needed, the cylindrical section serves as a stable reference that maintains its diameter, while the conical tip can be reground independently without affecting the overall precision of the tool.
Solution Approach 2:
The cylindrical section is designed with a precise diameter from the beginning that serves as a reference for subsequent regrounding operations. This preliminary establishment of a stable reference dimension enables future maintenance without compromising precision.
Data Source
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AI summary
The invention relates to a die (1) for machining the retaining arms (2) of jewelry pieces (4). The die (1) comprises a cylindrical shank (11) and a head (12). The head (12) comprises a cylindrical section (13) and a transition section (14). The shank (11) and the head (12) are arranged along a common central axis (X - X). The outer diameter (11a) of the shank (11) is larger than the outer diameter (13a) of the cylindrical section (13). Furthermore, the cylindrical section (13) is arranged at a first end (15) of the die (1), with the transition section (14) being located between the cylindrical section (13) and the shank (11). The head (12) at the first end (15) has a recess (16) on its end face.