Injection Molding Closing Unit Backlash-Free Support
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Solution Overview
Problem
The existing closing units for injection molding machines with tie-bar-less designs face issues of strong internal frictional effects due to tribocorrosion and difficulties in matching upsetting and flexing, leading to reduced service life and functionality.
Innovation Solution
A closing unit design featuring a backlash-free connection of the flexural beam to the machine frame, using two flexural beams connected by a compression bar, which eliminates internal friction and allows for precise adjustment of stiffness and flexing to maintain the stationary mold mounting plate's vertical orientation under load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a compression bar presses loosely against a flexural beam to compensate for mold mounting plate orientation change, then the mold mounting plate can be fixedly mounted to the machine frame, but strong internal frictional effects occur causing tribocorrosion and reducing service life
Solution Approach 1:
The harmful frictional contact is extracted from the support element by introducing a backlash-free connection between the flexural beam and machine frame. The compression bar is removed from the flexural beam and reconnected to the stationary mold mounting plate, eliminating the source of tribocorrosion while preserving the orientation compensation function.
Solution Approach 2:
The stationary mold mounting plate serves as an intermediary element that directly connects to the compression bar, replacing the indirect friction-based contact. This intermediary connection eliminates internal frictional effects while maintaining the structural integrity and orientation stability of the mold mounting plate.
2Stability of the object's composition
If a compression bar and flexural beam are used to compensate for orientation change, then the mold mounting plate remains fixed, but it becomes difficult to achieve satisfactory matching of upsetting and flexing
Solution Approach 1:
The system transitions from a static friction-based connection to a dynamic backlash-free connection. The flexural beam can now flex independently without frictional constraints, allowing for easier adjustment and matching of the upsetting and flexing effects while maintaining the fixed mounting of the mold mounting plate.
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 prevents tribocorrosion and allows for optimal selection of upsetting and flexing, ensuring the stationary mold mounting plate remains vertical, thereby enhancing the service life and functionality of the injection molding machine by eliminating internal frictional effects and enabling precise fine-tuning.
Implementation Method 1
the support element comprises a compression bar... and a flexural beam... The required flexing arises out of the requirement that the stationary mold mounting plate is to remain vertical under load
Implementation Method 2
the compression bar... under the closing force presses loosely against a flexural beam... the compression bar is in the form of an extension on the stationary mold mounting plate
Data Source
AI summary
A closing unit for an injection molding machine includes a substantially C-shaped machine frame, to the first leg of which is mounted a stationary mold mounting plate and to the second leg of which is mounted a closing mechanism for driving a moveable mold mounting plate. The free ends of the legs of the machine frame are deformed under the influence of the closing force occurring during the closing operation. The stationary mold mounting plate is supported at or near its lower edge by a support element on the machine frame against the closing force, and is fixedly connected above the lower edge to the first leg. The support element has a flexural beam extending transversely relative to the longitudinal axis of the machine, and a compression bar extending in the direction of the longitudinal axis of the machine.