Self-Centering Mold Inserts for Golf Ball Cover Casting
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Solution Overview
Problem
Conventional golf ball cover molding techniques face issues with parting line anomalies due to misregistration and wear of mold halves, leading to surface imperfections and increased manufacturing costs, which require extensive post-molding processes like buffing or grinding to correct.
Innovation Solution
The use of mold halves with floatable mold-cavity inserts and self-centering devices that provide multiple degrees of freedom, allowing for automatic centering and alignment, reducing the need for precise initial alignment and minimizing the impact of wear-induced misalignments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional fixed mold-cavity inserts are used, then manufacturing precision is maintained initially, but wear-induced misalignment occurs over time requiring expensive mold replacement
Solution Approach 1:
The mold-cavity insert is made movable rather than fixed, allowing it to adjust its position dynamically. The insert can float in multiple degrees of freedom and automatically reposition itself during mold closing to compensate for wear and misalignment, thereby maintaining manufacturing precision throughout the mold's service life without requiring replacement.
Solution Approach 2:
The self-centering device enables the mold-cavity insert to automatically correct its own alignment without external intervention. Through mechanical elements like tapered pins or cam mechanisms, the insert self-adjusts its position relative to the mating mold half, compensating for wear-induced misalignment and maintaining precision autonomously over time.
2Manufacturing precision
If precise initial alignment of mold halves is achieved, then surface quality is improved, but extensive post-molding buffing or grinding is still required due to wear
Solution Approach 1:
The movable mold-cavity insert continuously adapts its position during the molding process and between cycles, maintaining optimal alignment dynamically rather than relying on static initial alignment. This reduces the accumulation of misalignment errors that would otherwise require post-molding correction.
Solution Approach 2:
The self-centering mechanism provides continuous feedback-based adjustment of the mold-cavity insert position. As the insert wears or shifts, the mechanical feedback system detects the misalignment and automatically corrects it, preventing surface quality degradation that would require post-processing.
3Device complexity
If mold halves are designed with rigid fixed inserts, then device complexity is minimized, but adaptability to wear and misalignment is reduced
Solution Approach 1:
The mold-cavity insert is designed with controlled mobility in multiple degrees of freedom, allowing it to adapt to wear and misalignment. The floatability mechanism and self-centering device add minimal structural complexity while providing significant adaptability, enabling the insert to automatically compensate for dimensional changes and maintain alignment precision throughout its service life.
Data Source
AI summary
Molds are disclosed for forming golf-ball covers by casting. An exemplary mold includes first and second support members that are placeable in face-to-face opposition to each other. At least one respective mold-cavity insert, defining a respective hemispherical cavity, is mounted to each support member. The mold-cavity insert is floatable in at least three (e.g., x, y, z) degrees of freedom relative to the respective support member. Each mold-cavity insert on the first support member is in face-to-face opposition to a respective mold-cavity insert on the second support member whenever the support members are in face-to-face opposition to each other, such that the respective hemispherical cavities of each opposing pair of inserts form respective spherical ball-cover cavities. A respective z-direction bias is associated with each mold-cavity insert. Also, a respective self-centering device is associated with each opposing pair of inserts. The self-centering device urges movement of at least one mold-cavity insert of the opposing pair in any of at least three degrees of freedom as required to center the mold-cavity inserts of the opposing pair with each other.