Mold Lock Interlock with Segmented Nose for Misalignment Tolerance
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Solution Overview
Problem
Conventional mold interlocks face issues such as binding due to narrow clearance, limited misalignment tolerance, lubrication requirements, and excessive wear, which restrict their use in applications like medical and food component molding, and lead to premature replacement.
Innovation Solution
A mold lock design featuring a male interlock arrangement with a recessed nose and spaced bosses for initial contact, and a female interlock arrangement with a socket and projections, providing multiple interlocking points to accommodate greater misalignment and reduce wear through rotatable rollers, ensuring accurate alignment and preventing over-travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional side locks with narrow clearance are used, then the structure is simple and easy to install, but the locks can bind if not opened in parallel and give little protection to smaller angle shut-offs
Solution Approach 1:
The interlock head is segmented into multiple functional zones: a large radius nose portion for initial contact and misalignment accommodation, spaced-apart bosses for secondary contact points, and a body portion for structural support. This segmentation allows each zone to perform its specific function in sequence during mold closing, preventing binding while maintaining ease of installation.
Solution Approach 2:
The large radius nose portion is designed to make initial contact with the receptacle sidewalls before the main body of the head enters the receptacle. This preliminary action occurs at a distance from the final locked position, allowing misalignment correction to begin early in the closing sequence and preventing binding before it can occur.
2Manufacturing precision
If conventional side locks with zero clearance are used, then the locking fit is precise, but excessive wear occurs due to metal-to-metal contact and lubricant being wiped during operation
Solution Approach 1:
The nose portion of the interlock head is formed with a large radius of curvature, creating a rounded surface that contacts the receptacle sidewalls. This curvature distributes contact stresses over a larger area compared to sharp edges, reducing wear on both the head and receptacle surfaces while maintaining precise locking fit.
Solution Approach 2:
The clearance parameters are optimized to provide minimal clearance for precision locking while incorporating the large radius nose and spaced bosses that reduce metal-to-metal contact stress. The design changes the contact mechanics from line contact to area contact, extending interlock service life without sacrificing locking precision.
3Device complexity
If conventional side locks are used, then the structure is simple, but misalignment between mold halves cannot be corrected leading to shut-off misalignment or clashing
Solution Approach 1:
The interlock head is segmented into multiple functional zones: a large radius nose portion for initial contact and misalignment accommodation, spaced-apart bosses for secondary contact points, and a body portion for structural support. This segmentation allows each zone to perform its specific function in sequence during mold closing, preventing binding while maintaining ease of installation.
Solution Approach 2:
The large radius nose portion is designed to make initial contact with the receptacle sidewalls before the main body of the head enters the receptacle. This preliminary action occurs at a distance from the final locked position, allowing misalignment correction to begin early in the closing sequence and preventing binding before it can occur.
4Ease of operation
If lubrication is applied to conventional side locks, then friction is reduced, but lubricants cannot be used in medical and food component molding applications
Solution Approach 1:
The nose portion of the interlock head is formed with a large radius of curvature, creating a rounded surface that contacts the receptacle sidewalls. This curvature distributes contact stresses over a larger area compared to sharp edges, reducing wear on both the head and receptacle surfaces while maintaining precise locking fit.
Solution Approach 2:
The spaced-apart bosses are positioned to make contact with the receptacle sidewalls at specific points during the closing sequence. This geometry creates a self-aligning mechanism that reduces friction and wear through controlled contact points without requiring external lubrication, making the interlock suitable for applications where lubricants are prohibited.
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 design achieves true positioning with zero misalignment error, tolerates up to 5° misalignment, reduces friction, and prevents clashing or scraping of mold components, enhancing the reliability and longevity of the mold locking mechanism.
Implementation Method 1
reduces friction
Data Source
AI summary
A mold lock for a mold that includes a plurality of interlocking arrangements that are configured to provide at least a plurality of interlocks during mold closing. A male interlocking arrangement includes a head with a nose that has a recessed or offset portion that facilitates primary interlocking during mold closing. The nose can be configured with one or more spaced apart bosses that make contact with arms of a female interlocking arrangement at an initial point of contact that then facilitate mold alignment when a second point of contact is achieved.