Unitary 9-1-1 Titanium Golf Club Head Casting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current golf club head manufacturing methods, such as investment casting, face limitations in reducing face plate thickness while maintaining structural integrity and achieving desired curvature and thickness profiles, leading to inefficiencies in weight distribution and increased manufacturing costs.
Innovation Solution
The use of 9-1-1 titanium alloy for casting golf club heads as a single unitary body, eliminating the need for separate face and body components and reducing alpha case thickness through controlled mold preheating and coating, allowing for thinner, more durable face plates with variable thickness and curvature profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If investment casting is used to manufacture golf club heads, then the face plate can be formed with complex curvature and thickness profiles, but the manufacturing cost increases and yield decreases due to surface void defects and inadequate filling
Solution Approach 1:
The patent changes the physical parameters of the casting process by preheating the mold to specific temperature ranges (e.g., 100-200°C for ceramic molds, 200-400°C for metal molds) and controlling the pouring temperature of the titanium alloy. These parameter changes improve metal flow characteristics and reduce void defects, thereby maintaining manufacturing feasibility while achieving complex face plate geometries
Solution Approach 2:
The patent employs composite material strategies by using titanium alloys with specific compositional ranges (e.g., Ti-6Al-4V, Ti-6V-2Sn) that combine excellent castability, mechanical properties, and resistance to alpha case formation. The alloy composition is optimized to balance strength requirements with manufacturing ease, reducing defects and improving yield
2Weight of moving object
If the face plate thickness is reduced to lower mass, then the discretionary mass increases for performance optimization, but the structural integrity and strength of the face plate deteriorates
Solution Approach 1:
The patent implements variable thickness profiles where the face plate is thickest at the impact zone (sweet spot) and progressively thinner toward the periphery. This local quality variation optimizes strength exactly where needed while minimizing overall mass, allowing reduced face plate weight without compromising structural integrity at critical locations
Solution Approach 2:
The patent incorporates convex curvature (bulge and roll) in the face plate design, which distributes stress more effectively across the surface. The curved geometry enhances structural strength and durability while allowing thinner overall thickness, thereby reducing mass while maintaining or improving strength characteristics
3Strength
If conventional titanium alloys are used for face plate casting, then the face plate gains strength, but an alpha case layer forms that requires chemical etching with hydrofluoric acid, increasing process complexity and safety hazards
Solution Approach 1:
The patent modifies the casting process parameters, specifically controlling mold preheating temperature and titanium alloy composition, to minimize alpha case formation during casting. By optimizing these parameters, the alpha case thickness is reduced to acceptable levels that eliminate the need for aggressive chemical etching, thereby simplifying the manufacturing process and reducing safety hazards
Solution Approach 2:
The patent accepts a thin alpha case layer as an inevitable byproduct of casting but designs the process to make it negligible in thickness and impact. Rather than requiring complex removal processes, the alpha case is allowed to remain at minimal thickness, effectively treating it as a disposable surface layer that does not compromise face plate performance, thereby eliminating costly and hazardous etching operations
4Volume of moving object
If the club head size is increased to improve forgiveness and sweet spot area, then the club head inertia and face plate area increase, but the total weight increases requiring stronger materials to maintain swing speed
Solution Approach 1:
The patent utilizes titanium alloys that provide high strength-to-weight ratio, enabling the construction of larger club head volumes without proportionally increasing weight. The advanced titanium alloy composition allows for hollow club head designs with optimized wall thicknesses, achieving increased forgiveness and sweet spot area while maintaining weight constraints for optimal swing speed
Solution Approach 2:
The patent implements non-uniform thickness distribution throughout the club head structure, with thicker sections in high-stress areas and thinner sections where strength requirements are lower. This local quality optimization allows maximum club head volume and forgiveness while minimizing overall weight, as material is strategically placed only where structurally necessary
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 results in golf club heads with reduced weight, improved ductility, and enhanced durability, eliminating the need for chemical etching and simplifying the manufacturing process, while maintaining or exceeding the strength properties of conventional titanium alloys.
Implementation Method 1
preheating the mold to a lower than normal temperature
Implementation Method 2
the face plate and other portions of the body acquire less oxygen from the mold
Implementation Method 3
an appropriate metal melt is cast into a preheated ceramic investment mold
Implementation Method 4
coating an inner surface of the mold, to further reduce the amount of oxygen transferred from the mold to the 9-1-1 titanium during casting
Data Source
AI summary
Disclosed golf club head bodies are cast of 9-1-1 titanium with the face plate being cast as a unitary part of the body along the with crown, sole, skirt and hosel. Due to the 9-1-1 titanium material, the face plate and other portions of the body can have a reduced alpha case thickness and resulting greater durability. This can eliminate the need to reduce the alpha case thickness using hydrofluoric acid or other dangerous chemical etchants. Casting methods can include preheating the casting mold to a lower than normal temperature, to further reduce the amount of oxygen transferred from the mold to the 9-1-1 titanium during casting.