Interdental Tool Shaft Guide Grooves for Resin Filling
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Solution Overview
Problem
The manufacturing method for interdental cleaning tools often results in nonuniform thickness of the cleaning part due to bending of the shaft part during resin material filling, caused by pressure differences across the filling space.
Innovation Solution
Incorporating first and second guide grooves on the shaft part to guide the resin material in the axial direction, preventing displacement and pressure differences, thus maintaining the shaft's integrity and ensuring uniform thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the shaft part is clamped by holding pins during resin material filling, then the shaft part can be held in position, but the shaft part bends due to pressure difference causing nonuniform cleaning part thickness
Solution Approach 1:
Guide grooves are introduced as intermediary structures on the shaft part surface to mediate between the resin material flow and the shaft part structure. These grooves channel the resin material flow along the axial direction, preventing circumferential displacement and pressure difference that cause bending, while allowing the holding pins to maintain positional stability.
Solution Approach 2:
The surface geometry of the shaft part is modified by adding guide grooves, changing the flow parameters of the resin material. This structural parameter change directs the resin flow pattern from potentially circumferential displacement to axial flow along the grooves, eliminating the pressure difference that causes bending.
2Ease of manufacture
If resin material is filled from the insertion end of the shaft part, then the cleaning part can be formed around the shaft part, but pressure difference causes shaft part bending and displacement
Solution Approach 1:
Guide grooves serve as intermediary channels that mediate the resin material filling process. They guide the resin flow from the insertion end along the axial direction, preventing circumferential displacement and ensuring the shaft part remains stable while the cleaning part forms uniformly around it.
Solution Approach 2:
The guide grooves create localized flow paths on the shaft part surface, concentrating the resin material flow in specific axial channels. This local quality change in flow distribution prevents overall circumferential displacement and ensures stable shaft part positioning during the filling process.
Data Source
AI summary
[Problem] To provide a base part, an interdental cleaning tool, and a method for manufacturing the interdental cleaning tool, capable of preventing bending of a shaft part when a resin material is filled from an insertion end. [Solution] A base part includes a shaft part (20) and a grip part (30). The base part is used for forming an interdental cleaning tool by filling, inside a metal mold having a shape that forms a filling space around the shaft part (20), a resin material into the filling space with the shaft part (20) clamped by a holding pin. The shaft part (20) includes a first guide groove (24) formed on one side with respect to an axially parallel plane and a second guide groove (26) formed on the other side with respect to the axially parallel plane. The first guide groove (24) and the second guide groove (26) extend in the axial direction from an insertion end (22a) toward a base end and have a shape recessed toward the center of the shaft part (20) from the outer peripheral face of a region other than the first guide groove (24) and the second guide groove (26) in the shaft part (20).