Injection Mold Slide and Pressing Member for Burr-Free Insert Molding
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Solution Overview
Problem
Existing injection molding methods struggle to produce injection-molded articles with exposed portions on two continuous surfaces without generating burrs, and current solutions increase manufacturing costs due to the need for separate resin members that can be damaged or misaligned.
Innovation Solution
An injection molding mold apparatus with a slide mold and a pressing member that moves in the mold opening and closing direction, allowing the slide mold to absorb variations in the insert member in different directions, eliminating the need for a separate resin member and preventing burr formation on exposed surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a slide mold is used to absorb variations in the insert member, then burr formation is prevented in one direction, but variations in other directions cannot be absorbed leading to burr formation
Solution Approach 1:
The mold is divided into multiple independent movable components: a slide mold that moves in the width direction and a pressing member that moves in the length direction. Each component independently absorbs variations in different directions, allowing the mold to handle insert members with variations in multiple dimensions without burr formation.
Solution Approach 2:
The solution transitions from one-dimensional variation absorption (single slide mold moving in width direction) to two-dimensional variation absorption by adding movement capability in the length direction through the pressing member. This dimensional expansion allows comprehensive handling of insert member variations.
2Manufacturing precision
If a separate resin member is used to prevent burr formation, then burr-free molding is achieved, but manufacturing cost increases due to additional components and assembly work
Solution Approach 1:
The functions of multiple separate resin members are merged into integrated mold components (slide mold and pressing member). This eliminates the need for separate resin members and their associated assembly operations, reducing manufacturing cost while maintaining burr prevention capability.
Solution Approach 2:
The mold structure itself provides the burr prevention function through its movable components, eliminating the need for external resin members. The slide mold and pressing member automatically adjust to absorb insert member variations, making the system self-sufficient without additional protective components.
3Manufacturing precision
If a separate resin member is used to prevent burrs, then molding precision is improved, but the risk of damage or misalignment increases
Solution Approach 1:
The mold's own components (slide mold and pressing member) perform the burr prevention function, eliminating reliance on separate resin members that could be damaged or misaligned. The integrated structure ensures consistent performance and reduces process variability.
Solution Approach 2:
Instead of using disposable or fragile resin members that need to be carefully handled and positioned, the invention employs durable mold components designed to withstand repeated use without damage or misalignment, significantly improving process reliability.
Data Source
AI summary
An injection molding mold apparatus including: a first mold and a second mold forming a cavity into which thermoplastic resin is configured to be injected; a slide mold provided on at least one of the first and second molds, capable of moving back and forth in a direction intersecting a mold opening and closing direction, and forming a part of the cavity while being in pressure contact with an insert member during molding; and a pressing member provided at a portion where the slide mold is not provided among portions of the first and second molds that face each other and at a position corresponding to a tip end portion of the slide mold, being movable in the mold opening and closing direction, and pressing and moving the tip end portion in the mold opening and closing direction when the first and second molds are closed.