Textured Ball Pen Tip Seat for Smooth Ink Delivery
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Solution Overview
Problem
Current metallic ball pen tips experience wear and do not provide a smooth writing experience due to inadequate ink delivery and surface roughness.
Innovation Solution
A method for manufacturing a metallic ball pen tip with a textured ball seat, involving a preform with a cylindrical wall and ball seat, where the ball seat is machined in steps and broached to create a stepped wall, then coined with a spherical die to enhance ink flow and reduce wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional smooth ball seat is used, then the manufacturing process is simple, but the writing smoothness is poor and tip wear is high
Solution Approach 1:
The ball seat is transformed from a uniform smooth surface to a heterogeneous textured surface with micro-dimples distributed across the surface. This local quality change creates specific zones for ink accumulation and retention, improving writing smoothness without requiring complete redesign of the entire ball seat structure
Solution Approach 2:
The continuous ball seat surface is segmented into multiple micro-dimples or cavities distributed across the surface. This segmentation creates discrete ink reservoirs that maintain continuous ink supply to the ball, reducing tip wear and improving writing performance
2Reliability
If the ball seat is textured with micro-dimples, then ink delivery is improved and tip wear is reduced, but the manufacturing process becomes complex
Solution Approach 1:
The micro-dimple texture pattern is pre-formed in the ball seat during the manufacturing process using a textured insert or mold. This preliminary action creates the ink-retention structure before final assembly, ensuring reliable ink delivery without requiring additional post-processing steps
Solution Approach 2:
The ball seat surface parameters are changed from smooth to textured by introducing micro-dimples with specific dimensions and distributions. This parameter change optimizes ink capillary action and retention, ensuring continuous ink supply while managing manufacturing complexity through controlled geometric parameters
3Manufacturing precision
If multiple machining steps are used to create the stepped wall, then the ball seat texture precision is improved, but the manufacturing time increases
Solution Approach 1:
A stepped wall structure is pre-formed in the ball seat before the final texturing operation. This preliminary action creates a prepared substrate that facilitates more precise and efficient texturing in the subsequent broaching or coating step, improving precision without proportionally increasing total manufacturing time
4Productivity
If the ball seat preform wall angle is optimized, then the coining process efficiency is improved, but the machining complexity increases
Solution Approach 1:
The ball seat preform wall angle is optimized to specific ranges (e.g., 30-60 degrees) to facilitate the coining process. This parameter optimization improves material flow and texture formation during coining, enhancing process efficiency while managing machining complexity through controlled geometric parameters
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 textured ball seat ensures a continuous ink layer, improving writing smoothness and reducing tip wear by optimizing the interaction between the ball and the seat.
Implementation Method 1
coining the stepped wall with a spherical die so as to obtain the ball seat
Data Source
Figure 1~2
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Figure 5~6
AI summary
A method (100) of manufacturing a metallic ball pen tip (14) for a writing instrument (10) comprising a feeding passage (26) extending in an axial direction, the feeding passage reaching in a housing (28) configured to receive a ball (24), the housing being defined by a cylindrical wall (30) and a ball seat (40), wherein the ball seat comprises a plurality of feeding grooves (38), and wherein the ball seat is textured, the method comprising the steps providing (102) a preform (14A) of the metallic ball pen tip comprising the feeding passage (26) and a housing preform (28A), the housing being defined by the cylindrical wall (30) and a ball seat preform wall (32), machining (104) the ball seat preform wall so as to obtain a stepped wall (34), broaching (106) feeding grooves (38) in the stepped wall and coining (108) the stepped wall (34) with a spherical die (54) so as to obtain the ball seat (40). Also disclosed is a metallic ball pen tip obtained by the method.