Soft-Insert Watch Band Molding Against Burrs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In existing manufacturing methods for molded articles like wristwatch bands, issues such as burrs and misfitting occur due to spaces between the primary and secondary molded articles, leading to undesirable appearance and design flaws.
Innovation Solution
A manufacturing method involving a first step of arranging a primary molded article in a molding die with a pressing section to ensure close contact with the die, a second step of pressing and deforming the primary article's outer peripheral portion to match the die's inner surface, and a third step of injecting resin for the secondary article while withdrawing the pressing section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the primary molded article is placed in the molding die without pressing, then the molding process is simple, but spaces occur between the primary and secondary molded articles causing burrs and misfitting
Solution Approach 1:
The pressing section performs preliminary pressing action on the primary molded article before resin injection to eliminate spaces and ensure close contact with the molding die inner peripheral surface, preventing burrs and misfitting in the final product
Solution Approach 2:
The pressing section acts as an intermediary tool that mediates between the primary molded article and the molding die, applying force to ensure proper contact and positioning before the secondary molding process
2Ease of operation
If the outer peripheral surface of the primary molded article is larger than the inner peripheral surface of the molding die, then insertion is easier, but the primary molded article rides on the molding die causing appearance defects
Solution Approach 1:
The pressing section performs preliminary pressing to reduce the outer peripheral dimensions of the primary molded article before insertion, ensuring it fits properly within the molding die inner peripheral surface without riding on it
Solution Approach 2:
The pressing section changes the physical parameters (dimensions, shape) of the primary molded article's outer peripheral surface through deformation, making it suitable for insertion into the molding die while maintaining appearance quality
3Ease of operation
If the outer peripheral surface of the primary molded article is smaller than the inner peripheral surface of the molding die, then insertion is easier, but spaces occur causing burrs
Solution Approach 1:
The pressing section performs preliminary pressing to expand the outer peripheral surface of the primary molded article to match the molding die inner peripheral surface, preventing spaces that would cause burr formation during resin injection
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 method ensures seamless integration of primary and secondary articles without gaps, resulting in a well-designed and aesthetically pleasing final product.
Implementation Method 1
pressing and deforming an outer peripheral portion of the primary molded article arranged in the molding die by a pressing section
Implementation Method 2
molding the secondary molded article by withdrawing the pressing section from inside the molding die while injecting resin to be the secondary molded article into the molding die
Data Source
AI summary
A molded article includes a primary molded article which is made of a soft material and includes an exposed section and an embedded section, and a secondary molded article in which the embedded section of the primary molded article is embedded with the exposed section being exposed and which has shoulder sections that laterally project outside an outer periphery of the primary molded article. The upper surface portions of the shoulder sections of the secondary molded article on the exposed section side coincide with boundary portions between an outer peripheral surface of the exposed section and an outer peripheral surface of the embedded section in the primary molded article.