Design and Removal Methods of Riser for Casting of Mechanical Valves
Introduction
In the production process of mechanical valves, castings are an indispensable component, and riser design and removal technology are one of the important factors affecting the quality of castings. Riser design and removal technology not only relate to the internal quality of castings but also affect production efficiency and costs. This article will discuss riser design principles, riser removal technology, and related matters needing attention.
1. Riser design principles
The main purpose of riser design is to ensure the internal quality of the casting while ensuring the dimensional accuracy of the casting. The basic principles of riser design include the following points:
The position of the riser should be as close as possible to the solidification starting point of the casting to ensure that the riser can fully fill the internal cavity of the casting during the solidification process, avoiding defects such as cold segregation and shrinkage.
The size of the riser should be designed according to the size and material of the casting to ensure that the riser can solidify smoothly, avoiding the risk of the riser being too small to fill the internal cavity of the casting or too large to cause an excessively long solidification time, affecting production efficiency.
The shape of the riser should match the shape of the casting to ensure that the riser does not affect the dimensional accuracy of the casting during the solidification process.
The surface of the riser should be smooth to avoid cold segregation of the metal during the solidification process.
2. Riser removal technology
Riser removal technology is the technology of removing risers from castings, mainly including mechanical removal and chemical removal methods.
Mechanical removal method: The mechanical removal method is to grind the riser off the casting using sandpapers, grinding tools, and other tools. This method is simple to operate, but requires a high level of skill and may produce a large amount of waste, causing certain pollution to the environment.
Chemical removal method: The chemical removal method is to dissolve the riser using chemical agents and then remove it from the casting by mechanical means. This method is simple to operate and has a small impact on the environment, but it requires the use of chemical agents, which are expensive, and there may be certain safety hazards.
3. Matters needing attention in riser removal
During the riser removal process, it is necessary to minimize damage to the casting to ensure the quality of the casting.
When using chemical agents, safety operation procedures should be followed to avoid harm to the human body.
When using mechanical tools, it is necessary to ensure the sharpness of the tools to avoid damage to the casting.
During the riser removal process, it is necessary to keep the environment clean as much as possible to avoid pollution to the environment.
Summary
The design and removal technology of risers are an indispensable part of casting production. Reasonable riser design can improve the quality of castings, while effective riser removal technology can improve production efficiency and reduce production costs. In the actual production process, risers should be designed reasonably according to the specific situation of the casting, appropriate riser removal technology should be selected, and safety and environmental protection issues should be paid attention to during the operation process to ensure the quality and production efficiency of castings.