Injection Mold Sliding Mechanism for Resin Window Burr Reduction

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Solution Overview

Problem

Existing injection-molding molds for vehicle resin window panels form burrs due to clearance between movable molds, which requires additional mold replacement and resin flow issues.

Innovation Solution

The injection-molding mold design includes a fixed mold and a movable mold with separate sliding molds that move in intersecting directions, utilizing a contact block biased by a spring to adjust cavity capacity and prevent resin flow, eliminating the need for mold replacement and reducing burr formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple movable molds are used to form different cavities, then the panel body and frame can be molded together, but clearance between molds causes burr formation

Engineering Contradiction:

Improveability to mold panel body and frame togetherVSAvoidburr formation on panel body

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The movable mold is divided into multiple independent sliding molds (first sliding molds for panel body, second sliding mold for frame) that can move separately in different directions. This segmentation allows each mold to be precisely positioned and controlled independently, eliminating clearance-related burr formation while maintaining the capability to mold both panel body and frame together in the same cycle.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sliding molds are designed to move dynamically in intersecting directions during the molding process. The first sliding molds move in a first direction to form the panel body cavity, then retract in a second direction, while the second sliding mold moves in the first direction to form the frame cavity. This dynamic movement sequence eliminates clearance issues and prevents burr formation.

Inventive Principle:

Principle #15Dynamics

2Productivity

If multiple movable molds are used to form different cavities, then integrated molding is achieved, but additional mold replacement work is required

Engineering Contradiction:

Improveintegrated molding of panel body and frameVSAvoidmold replacement time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

Multiple sliding molds (first sliding molds and second sliding mold) are combined within a single movable mold assembly that moves together with the fixed mold. This merging eliminates the need for separate mold replacements, as all cavities are formed by molds that are already positioned and integrated in the same mold unit, thereby maintaining high productivity without time loss to mold replacement.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The movable mold assembly serves multiple functions simultaneously by incorporating both first sliding molds (for panel body) and second sliding mold (for frame) in a single integrated structure. This multi-functional design allows the same mold assembly to form different cavities for different components without requiring replacement, thus achieving integrated molding without additional time loss.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Manufacturing precision

If sliding molds move in intersecting directions, then clearance is eliminated and burrs are reduced, but mold structure complexity increases

Engineering Contradiction:

Improvereduction of burr formationVSAvoidmold structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The sliding molds are designed with dynamic movement capabilities in intersecting directions, allowing precise positioning control that eliminates clearance between mold surfaces. This dynamic design, while adding mechanical complexity, achieves superior manufacturing precision by preventing burr formation through accurate mold alignment and contact during the molding process.

Inventive Principle:

Principle #15Dynamics

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 design effectively reduces burr formation on both the panel body and frame by eliminating clearance between molds and ensuring precise resin injection, enhancing the quality of the molded window panel.

Implementation Method 1

a contact block (25d) that is accommodated in the engagement recess (25a) while being biased by a biasing means (25c) so that the contact block (25d) projects from the engagement recess (25a)

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

a movable mold (13) which faces the fixed mold (11) and is movable back and forth with respect to the fixed mold (11)

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS9061456B2Injection-molding mold for making a resin window panel

Publication Date: 2015.06.23 DAIKYONISHIKAWA CORP

AI summary

The first sliding molds are movable back and forth in a direction orthogonal to a back-and-forth direction of the movable mold, come into contact with a periphery of the central mold when the first sliding molds move forward to form a first cavity for molding a panel body, and avoid interference with a second sliding mold when the first sliding molds move back to form a second cavity for molding a frame. The second sliding mold is movable back and forth in the back-and-forth direction of the movable mold, allows a forward movement of the first sliding molds when the second sliding mold moves back to form the first cavity, and comes into contact with an inner peripheral edge and an outer peripheral edge of the panel body held on a fixed mold, thereby forming sealing portions, when second sliding mold moves forward to form the second cavity.