Feeding Device Friction Buffering Sleeve Pressure
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Solution Overview
Problem
High-pressure molding processes face challenges with existing knock-off cores, including inadequate pressure buffering, risk of sleeve damage, sand loss, and sleeve inclination, leading to defects like sand holes and gas porosity in castings.
Innovation Solution
A feeding device comprising a metal locating element with a central boss and a tube-shaped knock-off element, where the knock-off element is interference fitted within the boss, providing friction-based buffering and guiding to reduce pressure on the sleeve and prevent sand loss, while maintaining coaxiality and simplifying sleeve design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a truncated-cone-shaped knock-off core is used, then the sleeve can be removed from the casting, but the knock-off core provides no buffering for the molding pressure, causing the sleeve to be damaged and increasing fabrication cost
Solution Approach 1:
The patent applies beforehand cushioning by designing the knock-off core with a cylindrical buffering section that absorbs molding pressure before it reaches the sleeve. This cylindrical portion acts as a cushion that deforms under pressure, protecting the sleeve from direct impact and preventing damage during the high-pressure molding process.
2Ease of operation
If a truncated-cone-shaped knock-off core is used, then the sleeve can be removed, but the knock-off core is prone to rupture or fragmentation, resulting in poor demolding and sand grains falling into the molding cavity
Solution Approach 1:
The patent applies composite materials by constructing the knock-off core from multiple material layers: a resilient buffering material for the cylindrical buffering section that absorbs pressure without rupturing, and a harder material for the knock-off section that maintains structural integrity. This composite structure prevents fragmentation and sand grain contamination while enabling effective sleeve removal.
3Manufacturing precision
If sand ribs are provided on the inner wall of the sleeve to fix the knock-off core, then the knock-off core can be located, but the sand ribs are damaged during use, causing sand grains to enter the molding cavity
Solution Approach 1:
The patent applies taking out by removing the sand ribs from the sleeve design and replacing them with a dedicated locating structure integrated into the knock-off core itself. The knock-off core includes a locating portion that fits into a corresponding locating feature on the sleeve, achieving accurate positioning without relying on vulnerable sand ribs that could break and contaminate the molding cavity.
4Ease of operation
If the upper part of the knock-off core is of circular cylinder shape with demolding inclination, then the sleeve can be removed, but poor coaxiality occurs during insertion-fitting, causing the sleeve to incline and resulting in poor feeding
Solution Approach 1:
The patent applies segmentation by dividing the knock-off core into distinct functional sections: a cylindrical buffering section for pressure absorption, a locating portion for precise positioning, and a knock-off section for sleeve removal. The locating portion features a precise fit with the sleeve that ensures coaxial alignment, while the knock-off section provides the necessary inclination for easy demolding, thus resolving the conflict between removal ease and alignment precision.
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 solution effectively reduces pressure on the sleeve, prevents sand loss and sleeve inclination, and ensures consistent sleeve neck heights, enhancing the quality and efficiency of high-pressure molding by minimizing defects and simplifying the sleeve's shape and manufacturing process.
Implementation Method 1
the knock-off element is interference fitted in the boss of the locating element... the relative displacement between the locating element and the knock-off element that results from friction achieves the effect of reducing the pressure subjected by the sleeve
Data Source
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AI summary
The invention discloses a feeding device, a feeding system, and a high-pressure molding method that belong to the technical field of casting, the feeding device comprising a locating element for connecting with a sleeve and a knock-off element connected with the locating element, in which: the locating element is in the shape of a disk with a through hole at the center, and a boss extending upwards is provided at the center of the locating element at the location of the through hole; the knock-off element is tube-shaped, with its upper part being cylinder-shaped and lower part being cone-shaped, and the upper part of the knock-off element is interference fitted in the boss of the locating element; the locating element and knock-off element are both made of metal. In present invention, the pressure subjected by the sleeve is reduced by the relative displacement between the locating element and the knock-off element that results from friction, thus achieving an effect of buffering and protecting the sleeve relatively well. The problems of sand loss resulting from the contact and friction between the knock-off core and the sleeve and the sleeve being prone to inclination in the prior art can be avoided in the invention.