Foam Injection Molding Mold Segmentation for Releasing Distance Control
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Solution Overview
Problem
The conventional foam injection molding method experiences quality issues due to variations in the minute releasing distance caused by the injection machine's conditions, leading to problems like coarse foam cells, surface denting, and unfoaming.
Innovation Solution
A foam injection molding apparatus with a dividable moving mold system, utilizing a minute releasing member for foaming and a separate member for spreading, where the pushing force for foaming is greater than for spreading, to maintain a consistent mold cavity extension and absorb excess distance, ensuring precise control over the mold cavity expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the injection machine pulls the moving mold by a certain distance for releasing, then the mold cavity extends and foaming occurs, but the releasing distance varies (spreads) due to injection machine conditions, causing quality problems
Solution Approach 1:
The moving mold is divided into two independent parts: a first moving mold that contacts the fixed mold and a second moving mold that faces the first moving mold. This segmentation allows the first moving mold to provide stable foaming releasing distance while the second moving mold absorbs the spreading variation from the injection machine.
Solution Approach 2:
The second moving mold acts as an intermediary between the injection machine and the first moving mold. It absorbs the excess releasing distance through elastic deformation of the spring, preventing this variation from affecting the precise mold cavity extension required for foaming.
2Manufacturing precision
If the minute releasing distance is increased to ensure adequate foaming, then foaming can occur, but quality problems such as coarse foam cells and surface denting occur
Solution Approach 1:
Different parts of the moving mold system have different functions: the first moving mold provides precise local control for foaming with a controlled minute releasing distance, while the second moving mold handles the absorbing of spreading variation. This local differentiation ensures high foam cell quality while maintaining ease of operation.
3Device complexity
If a single moving mold is used for both foaming and releasing, then the structure is simple, but the releasing distance cannot be precisely controlled due to spreading
Solution Approach 1:
The moving mold is segmented into two independent movable parts that can move relative to each other. The first moving mold handles foaming with precise distance control, while the second moving mold absorbs spreading. This segmentation increases device complexity but dramatically improves releasing distance control precision.
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 minimizes the occurrence of quality issues by maintaining a consistent mold cavity extension, achieving excellent product quality by naturally absorbing the excess releasing distance through elastic forces and preventing changes in the initial mold cavity capacity.
Implementation Method 1
a spring, which applies an elastic force to the stepped pusher pin
Implementation Method 2
the minute releasing member for spreading of the injection machine may be a spring which is installed between the first moving mold and the second moving mold
Data Source
AI summary
Provided are an apparatus and a method for foam injection molding, in which a problem in quality caused by spreading of a minute releasing distance according to conditions of an injection machine is improved by minutely releasing a first moving mold from a fixed mold using a minute releasing member for foaming and minutely releasing a second moving mold from the first moving mold using a minute releasing member for spreading of the injection machine.