Mold Holding Member Segmentation for Deformation Control
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Solution Overview
Problem
In mold clamping devices, the radial ribs formed on the fixed platen lead to stress transmission from the peripheral border to the central portion, causing deformation of the mold, which results in gaps between the molds, leading to burrs and resin leakage, thereby lowering the quality of molded articles.
Innovation Solution
The formation of tie bar holding portions and reinforcement portions that project from the die body suppresses deformation, preventing gaps between the molds and ensuring the quality of molded articles by maintaining the structural integrity of the mold clamping device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If radial ribs are formed on the fixed platen to prevent deformation, then the fixed platen resistance to deformation improves, but stress is transmitted from peripheral border portions to the central portion causing mold deformation
Solution Approach 1:
The fixed platen is segmented into multiple independent support portions (first support portion at corners, second support portions at side faces) rather than using radial ribs that transmit stress continuously from periphery to center. This segmentation isolates stress zones and prevents stress transmission that causes mold deformation.
Solution Approach 2:
Different regions of the fixed platen are provided with different support structures tailored to their specific stress conditions. Corner regions receive first support portions while side face regions receive second support portions, optimizing local stress distribution without causing overall mold deformation.
2Productivity
If mold clamping force is applied to advance the movable mold, then the molding process is enabled, but the fixed platen deforms forming gaps between molds
Solution Approach 1:
The support portions are strategically positioned to provide counter-support against the deformation forces generated during mold clamping. The first support portions at corners and second support portions at side faces create a balanced support system that counteracts the inward deformation tendency caused by clamping force.
Solution Approach 2:
The fixed platen is designed with multiple types of support portions that serve different functions: first support portions prevent corner deformation while second support portions prevent side face deformation. This multi-functional support system comprehensively prevents various modes of deformation during mold clamping.
3Strength
If ribs are formed in radial fashion to reinforce the fixed platen, then structural reinforcement is achieved, but stress transmission causes fixed mold deformation
Solution Approach 1:
Instead of continuous radial ribs that transmit stress, the reinforcement is achieved through segmented support portions located at specific high-stress areas (corners and side faces). This segmentation provides localized reinforcement without creating stress transmission paths to the central mold mounting region.
Solution Approach 2:
The support portions act as intermediary structures between the fixed platen body and the external forces. They absorb and distribute stresses locally, preventing direct stress transmission to the mold mounting surface and thus protecting the fixed mold from deformation.
Data Source
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AI summary
This object aims to improve the quality of a molded article. The mold die includes a die body (30), a tie bar holding portion (39) which is so formed as to project from the die body (30) at each corner of the die body (30) and holds a tie bar, and a reinforcement part which is so formed along the edge of the die body (30) as to project from the die body (30) and connects predetermined tie bar holding parts (39). Since the tie bar holding parts (39) and the reinforcement parts are so formed as to project from the die body (30), deformation of the mold die is suppressed, thereby suppressing deformation of a mold holding member and a mold. Furthermore, since a gap is not formed between the molds, such a problem doesn't happen that a molding material enters into the gap to form burrs or that leakage of a molding material through the gap occurs, thereby resulting in improvement in the quality of a molded article.