Golf Club Head Casting with 9-1-1 Titanium for Reduced Alpha Case
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Solution Overview
Problem
Current methods for manufacturing golf club heads, particularly metalwood club-heads, face challenges such as high production costs, low yields, and the need for complex and wasteful manufacturing processes due to investment casting, which often results in defects and requires chemical etching to remove the alpha case, limiting the ability to reduce face plate thickness and introduce desired curvatures and thickness profiles.
Innovation Solution
The use of 9-1-1 titanium alloy for casting golf club heads as a unitary part, reducing oxygen transfer during casting to minimize alpha case thickness, eliminating the need for chemical etching, and allowing for integrated formation of face plates with desired bulge, roll, and variable thickness profiles, while utilizing vacuum die casting to improve quality and reduce scrap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If investment casting is used to manufacture golf club heads, then complex shapes can be achieved, but production costs increase and yields decrease due to defects and alpha case formation
Solution Approach 1:
The patent changes the chemical composition parameters of the titanium alloy to 9-1-1 (9% Al, 1% V, 1% Mo) specifically to reduce alpha case formation during casting. This parameter change in material composition directly addresses the yield problem while maintaining the ability to cast complex shapes
Solution Approach 2:
The patent employs vacuum die casting technology that creates a controlled low-oxygen environment during the casting process. This inert environment prevents excessive oxygen transfer to the molten titanium, minimizing alpha case formation and reducing defects, thereby improving production yield
2Manufacturing precision
If chemical etching is used to remove alpha case, then surface quality improves, but manufacturing complexity increases and hazardous chemicals are required
Solution Approach 1:
The patent extracts or eliminates the chemical etching step from the manufacturing process by using vacuum die casting that prevents excessive alpha case formation in the first place. This removes the need for hazardous chemical treatments while maintaining surface quality
Solution Approach 2:
The vacuum die casting process itself provides the surface quality improvement by controlling the casting environment to minimize alpha case formation, eliminating the need for separate chemical etching operations
3Weight of stationary object
If face plate thickness is reduced to lower mass, then discretionary mass increases for performance, but strength and structural support are compromised
Solution Approach 1:
The patent uses a composite titanium alloy composition (9% Al, 1% V, 1% Mo) that combines the benefits of different elements to provide both reduced density and enhanced strength. This allows thinner face plates to maintain adequate structural support while reducing mass
4Weight of moving object
If titanium alloy is used for club head manufacture, then lightness and high strength are achieved, but oxygen transfer during casting increases alpha case thickness reducing ductility
Solution Approach 1:
The patent uses vacuum die casting that creates a low-oxygen environment during casting, preventing excessive oxygen transfer to the titanium alloy. This maintains ductility while preserving the lightness benefits of titanium
Solution Approach 2:
The patent modifies the titanium alloy composition to 9-1-1 (9% Al, 1% V, 1% Mo) which changes the material's response to oxygen exposure during casting, reducing alpha case formation and preserving ductility while maintaining lightness
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 reduces manufacturing costs, enhances durability and ductility, allows for thinner face plates with improved performance characteristics, and simplifies the manufacturing process by eliminating hazardous chemical etching, while achieving higher production yields and better product quality.
Implementation Method 1
utilizing vacuum die casting to improve quality and reduce scrap
Data Source
AI summary
A cast cup can include a forward portion of a golf club head, including a hosel, a face portion, and forward portions of a crown, sole, heel and toe. A rear ring can be formed separately from the cast cup and coupled to heel and toe portions of the cast cup to form a metallic club head body, such that the club head body defines a hollow interior region, a crown opening, and a sole opening. The cast cup and rear ring can be cast of titanium alloys. Composite crown and sole inserts can then be coupled to the crown opening and sole opening. The face portion of the cast cup can have a desirably complex geometry. The rear surface of the face portion of the cast cup can be modified before the rear ring is attached.