Injection Nozzle Flow Control for Explosive Melt Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cascade injection molding processes face issues with explosive discharge of melt at temporally downstream feed orifices due to pressure loss and cooling, leading to undesirable flow front markings and inhomogeneities in molded parts.
Innovation Solution
An injection molding system with electronically controlled actuator systems, including adjustable flow control valves and sensors, to manage the opening and closing of nozzles based on real-time flow and pressure data, preventing explosive discharge and ensuring precise control of the injection cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple feed orifices are used to fill the cavity completely, then the filling completeness is improved, but flow lines appear causing surface defects
Solution Approach 1:
The injection process is segmented into multiple sequential stages with different nozzles activating at different times. The cascade injection system divides the cavity filling into zones, with each nozzle serving a specific region, preventing flow line formation while ensuring complete cavity filling.
Solution Approach 2:
The nozzles operate in a periodic sequence rather than simultaneously. Each nozzle is activated at a predetermined time interval based on flow front progression, creating a controlled periodic injection pattern that eliminates flow lines while maintaining complete filling.
2Object-affected harmful factors
If later opening nozzles are opened slowly with reduced pressure, then explosive discharge is prevented, but process control complexity increases
Solution Approach 1:
The control system pre-programmes the opening sequence and pressure profiles for each nozzle before injection begins. The timing and pressure reduction for each nozzle are predetermined based on its position in the cascade sequence, eliminating the need for complex real-time adjustments during injection.
Solution Approach 2:
The system dynamically adjusts injection pressure and nozzle opening speed for each subsequent nozzle in the cascade sequence. Each nozzle operates with optimized dynamic parameters (pressure, opening velocity) that are automatically adapted based on its position and the current injection stage.
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
The system effectively prevents explosive melt discharge and ensures consistent quality by dynamically adjusting nozzle openings and pressures, reducing flow line visibility and improving part homogeneity.
Implementation Method 1
The actuator system comprises at least one piston drive with at least two pressure line connectors to drive a piston to open or close a molding nozzle
Implementation Method 2
The actuator system comprises at least one piston drive with at least two pressure line connectors to drive a piston to open or close a molding nozzle
Implementation Method 3
An electronically adjustable flow control valve is used to have an impact on the movements of the piston drive by throttling a pressure fluid driving the piston drive
Data Source
AI summary
An actuator system for an injection molding system includes a double acting pressurized fluid actuator having a piston drive movable in a cylinder space, a flow control valve for regulating a flow rate of pressurized fluid to and/or from the cylinder space, a flow sensor for detecting the flow rate of pressurized fluid to and/or from the cylinder space, and an electronic controller for controlling the flow control valve to regulate the flow rate of pressurized fluid to and/or from the cylinder space depending on the flow rate detected by the flow sensor.