Golf Club Head Undercut Cavity Design
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Solution Overview
Problem
The challenge is to accurately form an undercut cavity in a golf club head with a small flange portion thickness, as existing methods like lost-wax casting struggle to fill molding sand in such cavities, leading to increased mass and high center of gravity due to thicker flange portions.
Innovation Solution
The design features a flange portion with a first concave part having a tapered cross-section, an angle between 10-30 degrees, and a circular arc bottom surface with a radius of 1-2 mm, allowing accurate formation of the undercut cavity and reducing flange thickness, thereby lowering the head's mass and center of gravity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the flange portion thickness is increased to form an undercut cavity, then the undercut cavity can be formed, but the head mass increases and center of gravity rises
Solution Approach 1:
The patent applies parameter changes by optimizing the flange portion thickness to a specific range (5.0-7.0 mm) and designing the concave part with specific geometric parameters (angle 10-30 degrees, radius 1-2 mm) to achieve accurate undercut cavity formation without excessive thickness increase
Solution Approach 2:
The patent applies local quality by creating a concave part only in the inner surface of the flange portion facing the cavity, rather than reducing thickness throughout the entire flange. This localized approach allows undercut cavity formation while maintaining sufficient flange thickness in other areas to control overall mass
2Weight of moving object
If the flange portion thickness is reduced to lower head mass, then center of gravity decreases, but the undercut cavity cannot be accurately formed
Solution Approach 1:
The patent resolves this contradiction by changing the geometric parameters of the concave part (angle between 10-30 degrees and radius between 1-2 mm) to optimize sand filling during lost-wax casting, enabling accurate undercut cavity formation even with reduced flange thickness
Solution Approach 2:
The patent applies spheroidality by using a circular arc bottom surface with a specific radius (1-2 mm) in the concave part design. This curved geometry facilitates smooth molding sand filling during casting while maintaining the compact size needed for low mass
3Manufacturing precision
If the flange portion thickness is increased, then the undercut cavity can be formed, but the center of gravity of the head increases
Solution Approach 1:
The patent applies local quality by concentrating the mass reduction specifically in the flange portion where the undercut cavity is formed, while maintaining adequate thickness in other areas. This localized approach allows center of gravity lowering without compromising the ability to form the undercut cavity
Solution Approach 2:
The patent uses parameter changes by controlling the flange portion thickness within a specific range (5.0-7.0 mm) and designing the concave part with optimized dimensions to achieve the right balance between forming accuracy and center of gravity position
Data Source
AI summary
Provided is an iron type golf club head having an undercut cavity. The iron type golf club head comprises a face portion (2) for hitting a ball; a peripheral edge (2e) of the face portion (2) is provided with a flange portion (7) protruding backward of the head; a rear surface (5) of the face portion (2) is provided with a cavity (C) surrounded by the flange portion (7). The flange portion (7) includes a first flange part (8). The first flange part (8) is provided in its inner surface (8i) side facing to the cavity (C) with a first concave part (10) dented toward the outside of the head so as to form an undercut cavity (c2) extending along the peripheral edge (2e). The cross-section of the first concave part (10) comprises a front wall surface (11) positioned frontward of the head, a rear wall surface (12) positioned backward of the head, and a bottom surface (13) smoothly connecting therebetween, and the cross-section is tapered toward the bottom surface (13). The angle (θ1) formed between the front wall surface (11) and the rear wall surface (12) is not less than 10 degrees and less than 30 degrees, and the bottom surface (13) is formed of a circular arc having a radius (R1) of curvature of not less than 1 mm and less than 2 mm.