Vehicle Door Sealing Member Die for Easier Demolding
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Solution Overview
Problem
Existing sealing members for vehicle doors face challenges in efficiently inserting and removing the extrusion-molded parts from the die after forming, due to issues like material leakage and mechanical interference, which reduces production efficiency and requires skilled operators.
Innovation Solution
The sealing member and die configuration includes an extrusion-molded part with a U-shaped attaching portion lacking a protrusion portion in a specific section, and a holding die with a second holding portion and guiding portion that correspond to this section, allowing for easier insertion and removal while reducing material leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the holding die fills within the attaching portion outside the cavity to prevent forming material leakage, then material leakage is reduced, but the protrusion portion becomes caught by the holding die to hamper removal of the extrusion-molded part
Solution Approach 1:
The holding die is divided into multiple sections: a first holding portion that fills the attaching portion inside the cavity, a second holding portion that fills the attaching portion outside the cavity, and a guiding portion with progressively decreasing cross-section. This segmentation allows different regions of the holding die to perform different functions - the first holding portion prevents leakage while the guiding portion facilitates easy removal by providing a tapered exit path.
2Loss of substance
If the holding die fills within the attaching portion outside the cavity to prevent forming material leakage, then material leakage is reduced, but the protrusion portion and holding die become tight to hamper insertion of the extrusion-molded part
Solution Approach 1:
Instead of making the holding die protrusion-free to facilitate insertion and removal, the invention inverts the approach by providing a guiding portion with progressively decreasing cross-section. This inverted tapered structure actively guides the extrusion-molded part into the cavity during insertion and provides an expansion path during removal, converting the potential interference into a facilitating feature.
3Ease of operation
If operations of inserting and removing the extrusion-molded part are performed relying on intuition and knack of skilled operators, then insertion and removal can be accomplished, but human resource constraints occur and production efficiency is reduced
Solution Approach 1:
The guiding portion with progressively decreasing cross-section enables the extrusion-molded part to self-guide during insertion and self-expand during removal. The tapered geometry automatically provides the necessary clearance and directionality, allowing unskilled operators to perform insertion and removal operations without requiring intuition or knack, thereby eliminating human resource constraints and improving production efficiency.
Data Source
AI summary
A sealing member for a door of a vehicle, comprising an extrusion-molded part and a die-formed part, wherein the extrusion-molded part includes an attaching portion with a U-shaped cross section that has a protrusion portion, and the die-formed part is molded by using a die including an elongated holding die, and wherein the holding die includes a first holding portion, a second holding portion, and a guiding portion having a cross section progressively decreasing in a direction away from the cavity, and the protrusion portion is not provided in a section of the extrusion-molded part corresponding to the second holding portion and the guiding portion.