Movable Bearing Plate for Injection Molding Toggle Levers
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Solution Overview
Problem
Existing injection molding machines face challenges in achieving precise mold parallelism both statically and dynamically, as the drive units are typically mounted on a stationary rear support plate, limiting the precision of mold closing and opening movements.
Innovation Solution
The drive units are mounted on a movable bearing plate that moves synchronously with the mold carriers, allowing for increased precision by using force transmission elements and cooling devices, and can be preassembled as an independent module for better prefabrication and maintenance, with the option to integrate a grid frame-like structure for enhanced guidance and accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If drive units are mounted on a stationary rear support plate, then the structure is simple and easy to manufacture, but the precision of mold closing and opening movements is limited
Solution Approach 1:
The bearing plate is made movable instead of stationary, allowing it to move synchronously with the mold carriers during operation. This dynamic configuration enables the bearing plate to maintain precise positioning relative to the mold carriers throughout the closing and opening cycle, thereby improving mold closing precision while managing structural complexity through functional integration.
Solution Approach 2:
The bearing plate serves multiple functions: it supports the drive units, guides the toggle mechanisms, and moves synchronously with the mold carriers. By consolidating these functions into a single multifunctional component, the design improves precision without proportionally increasing overall structural complexity.
2Manufacturing precision
If drive units are mounted on a movable bearing plate, then the precision of mold parallelism control is improved, but the mass to be moved is increased
Solution Approach 1:
The drive units are integrated with the bearing plate into a single assembled module. This merging of components allows the bearing plate to move synchronously with the mold carriers, improving mold parallelism precision. The combined module design manages the increased mass by optimizing the integration of drive units with the bearing plate structure.
3Ease of manufacture
If the bearing plate is fully preassembled with drive units as an independent module, then ease of manufacture and maintenance is improved, but the initial assembly complexity increases
Solution Approach 1:
The bearing plate assembly is divided into a separate, preassembled module that includes the bearing plate and drive units. This segmentation allows the module to be manufactured, tested, and assembled independently before integration into the overall machine, thereby improving ease of manufacture and maintenance while managing integration complexity through standardized interfaces.
4Reliability
If cooling devices are integrated into the bearing plate, then the service life and geometric accuracy are improved, but the device complexity increases
Solution Approach 1:
The bearing plate is designed to integrate cooling devices as part of its multifunctional capabilities. The cooling devices are incorporated into the bearing plate structure itself, allowing for improved service life and geometric accuracy through effective heat management, while the integrated design manages complexity by combining cooling functionality with the existing bearing plate structure.
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 configuration enhances the precision and service life of the injection molding machine by allowing precise control of mold parallelism and interplay between opening and closing, with improved geometric accuracy and ease of maintenance.
Implementation Method 1
at least two toggle mechanisms (K) for moving the mold carriers (11, 12) towards and away from one another in the closing direction s-s
Implementation Method 2
the bearing plate is guided on force transmission elements such as beams arranged between the stationary mold carrier and the supporting element
Data Source
AI summary
An injection-molding machine for processing plastics has, on a mold-closing unit (F), at least one injection mold (10) which can be accommodated between a stationary mold carrier (12) and a movable mold carrier (11). The mold carriers are moved by means of at least one pair of toggle levers with two toggle lever mechanisms (K), which are driven in a closing direction (s-s) independently of one another each by a drive unit (A), wherein the toggle lever mechanisms (K) are mounted on a bearing plate (14). Since the bearing plate (14) is mounted on the injection-molding machine such that it can move along guides (28), and the drive units (A) are mounted on the movable bearing plate (14) on which the actuating elements for the at least two toggle lever mechanisms (K) are mounted, it is possible to influence the parallelism of the mold carriers both in the static and in the dynamic state.