Annular Molding Apparatus Gas Discharge Flow Channel
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Solution Overview
Problem
Conventional molding apparatuses face challenges in sufficiently discharging gas from the cavity during the molding of annular articles, leading to potential blowholes and obstruction of discharge holes by solidified molten metal.
Innovation Solution
The apparatus features a flow channel with grooved shapes forming a concavo-convex structure around a discharge hole, allowing gas to be efficiently discharged while preventing molten metal from reaching the hole, utilizing a first and second block with penetration parts and a discharge hole at a central position, ensuring a circular flow channel for effective gas removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a discharge hole is provided inside the cavity to discharge gas, then gas discharge is improved, but molten metal may reach the discharge hole and obstruct it
Solution Approach 1:
A flow channel is introduced as an intermediary structure between the cavity and the discharge hole. The flow channel allows gas to reach the discharge hole while the molten metal is cooled and solidified during its passage through the flow channel, preventing obstruction of the discharge hole.
Solution Approach 2:
The temperature of the molten metal is changed during its passage through the flow channel. The molten metal is cooled as it flows through the channel, causing it to solidify before reaching the discharge hole, thus preventing obstruction.
2Reliability
If the flow channel area is increased to cool molten metal sufficiently, then molten metal solidification is improved, but gas discharge efficiency may be reduced
Solution Approach 1:
The flow channel is designed with a specific cross-sectional area that is optimized for cooling the molten metal. The channel provides sufficient cooling surface area while maintaining an open path for gas to reach the discharge hole efficiently.
Solution Approach 2:
The flow channel extends in the radial direction from the cavity wall toward the discharge hole, creating a three-dimensional cooling path. This allows sufficient cooling surface area to be provided without blocking the gas discharge path.
3Object-generated harmful factors
If a block with flow channel is placed inside the cavity, then gas discharge is improved, but the block occupies space in the cavity
Solution Approach 1:
The flow channel structure is segmented into a block portion that is integrally formed with the molding die. This allows the flow channel to be provided without requiring a separate block to be placed inside the cavity, thus reducing the occupied space.
Solution Approach 2:
The flow channel is merged with the molding die structure itself, forming an integral part of the die. This eliminates the need for a separate block and reduces the space occupied in the cavity while maintaining the gas discharge function.
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 design ensures smooth and complete gas discharge, prevents molten metal from obstructing the discharge hole, and enhances the strength and removability of burrs, improving the overall molding process.
Implementation Method 1
The gas generated in the cavity flows in the flow channel of the block and can be discharged from the discharge hole to the outside. The molten metal poured in the cavity is cooled and solidifies in the course of flowing in the flow channel
Implementation Method 2
A discharge hole is formed in at least one of the first and second blocks. The discharge hole is capable of discharging the gas flowing in the flow channel to the outside
Data Source
AI summary
A molding apparatus for obtaining an annular molded article has a fixed die D1 and a movable die D2 capable of forming an annular cavity C. A first block B1 and a second block B2 are formed inside the cavity C in the fixed and movable dies D1 and D2. The blocks form a flow channel R communicating with the cavity C. Thus, gas generated in the cavity C and a molten metal can flow in the flow channel R. A discharge hole B2b is formed in the second block B2 to discharge the gas flowing in the flow channel R to the outside. A forming surface of the flow channel R, in the first and second blocks B1 and B2, is formed in an outer circumferential shape following an inner circumferential shape of the cavity C.