Blow Molding Split Mold Sliding Mechanism to Prevent Gnawing
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Solution Overview
Problem
The existing blow molding mechanisms face issues with scratching or gnawing at the boundary portions between split molds due to high contact pressure and sliding, leading to potential defects in the final product and reduced machinability of the molds.
Innovation Solution
The implementation of a sliding member with higher hardness than the adjacent split molds, which is attachable and detachable, allows for sliding without contact, reducing the risk of scratching or gnawing and improving machinability by allowing the molds to open and close in a perpendicular direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If split molds are used in blow molding, then the mold can be opened and closed in a perpendicular direction to the injection direction, but scratching or gnawing occurs at the boundary portions between split molds due to high contact pressure and sliding
Solution Approach 1:
A sliding member is introduced as an intermediary component between the first and second split molds. This sliding member enables relative sliding motion between the split molds while preventing direct contact between them, thereby eliminating scratching and gnawing at the boundary portions. The sliding member acts as a mediator that allows the perpendicular opening/closing operation while protecting the mold boundaries from damage.
2Ease of manufacture
If the first and second split molds are made of the same material, then manufacturing is simplified, but the boundary portions are prone to scratching and gnawing due to equal hardness
Solution Approach 1:
Instead of using uniform material throughout, the invention applies different material properties to different components. The sliding member is made of a material with higher hardness than the split molds, creating a local quality enhancement at the critical boundary interface. This localized hardness improvement protects the boundary portions from scratching and gnawing while maintaining overall manufacturing feasibility.
3Object-affected harmful factors
If the sliding member is made of a material with higher hardness than the split molds, then scratching and gnawing are prevented, but the sliding member wears faster
Solution Approach 1:
The sliding member is designed as a replaceable component with a planned service life. By making the sliding member detachable and designed to wear, the system allows for easy replacement of the sliding member rather than the entire mold. This approach accepts that the sliding member will wear faster but minimizes the impact through easy replacement, while the expensive split molds retain their higher hardness and longevity.
4Reliability
If the first and second split molds are made of different materials with different hardness, then scratching and gnawing are reduced, but manufacturing complexity increases
Solution Approach 1:
Instead of making the entire split mold system from different materials, the invention applies different material properties locally only to the sliding member. The split molds can be manufactured from standard materials, while the sliding member uses a harder material specifically at the interface where scratching and gnawing occur. This localized approach reduces overall manufacturing complexity compared to using different materials for all components.
Data Source
AI summary
An operation mechanism includes: a first member that is a member which operates in a second direction perpendicular to a first direction in which a stationary mold and a movable mold are closed and opened; a second member that is a member which operates in the second direction and that does not come into contact with the first member; and a sliding member that is attachably and detachably fixed to the second member and that is slidable with respect to the first member.