Golf Club Head Crown Thin Regions Casting
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Solution Overview
Problem
Conventional golf club head manufacturing methods, such as investment casting, face challenges in producing a crown with thin regions due to rapid metal solidification in thin-wall areas, leading to incomplete filling of the mold and voids in the finished part, especially for large titanium alloy drivers with crowns less than 0.030 inch thick.
Innovation Solution
A golf club head design featuring a hollow body with a crown having a web-shaped pattern of thin regions arranged in rows, which reduces material thickness and redistributes it to the sole, lowering the center of gravity, and using linear and arcuate ribs to facilitate complete molten metal filling during casting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If investment casting is used to produce a crown with thin regions, then material can be removed to lower center of gravity, but rapid solidification in thin-wall areas causes incomplete mold filling and voids
Solution Approach 1:
The crown is divided into multiple thin regions arranged in a web-shaped pattern, with material strategically removed to create lighter sections that lower the center of gravity while maintaining structural integrity through the segmented design
Solution Approach 2:
The crown thickness parameter is varied across different regions, creating thin regions (0.016-0.030 inch) in specific areas while maintaining thicker sections elsewhere, allowing weight reduction without compromising overall strength
2Weight of moving object
If crown thickness is reduced to less than 0.030 inch, then weight is reduced and center of gravity is lowered, but manufacturing difficulty increases due to casting defects
Solution Approach 1:
Different regions of the crown have different thickness qualities - thin regions (0.016-0.030 inch) are placed in specific locations to reduce weight, while other regions maintain greater thickness for strength, creating local variations in material properties
Solution Approach 2:
A release agent is applied to the mold cavity before casting to prevent the molten titanium alloy from adhering to the mold walls, ensuring complete release of the thin-walled crown structure without defects
3Weight of moving object
If material is removed from the crown, then center of gravity is lowered toward the sole, but structural strength may be compromised
Solution Approach 1:
The crown is segmented into a web-shaped pattern of thin regions that maintain structural connectivity, distributing loads across multiple pathways rather than relying on solid continuous material
Solution Approach 2:
The crown utilizes the titanium alloy material properties in combination with the web-shaped geometric structure, creating a composite-like behavior where the material distribution pattern enhances structural efficiency
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
The web-shaped pattern effectively removes approximately 3 grams of material from the crown, allowing for reliable production of a lightweight golf club head with improved center of gravity distribution and avoiding voids in the casting process.
Implementation Method 1
conventional investment casting methods cannot reliably produce a large (e.g. 460 cc) titanium alloy driver with a crown less than 0.030 inch thick
Implementation Method 2
the rapidly-cooling metal tends to solidify in the thin-wall areas of the mold
Data Source
AI summary
A method of casting a hollow golf club head includes casting the crown with a plurality of thin regions having a thickness of less than 0.030 inch separated by a plurality of ribs. The ribs act as cast-in runners that enable the thin sections to be formed without voids despite the extremely thin cross-section. The crown may have an additional region of substantially uniform thickness that is substantially the same as the thickness of the ribs.