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Foundry casting technology

4/6/2019 - Factors affecting the specific pressure of cast bronze parts

When selecting a cast bronze part, the user should generally have a full understanding of its parameters, performance, etc., in order to purchase the product with confidence, and its necessary pressure is a reference value for its quality. What factors will affect its specific pressure?

1. The quality of the cast bronze parts: the internal quality requirements are high, and the pressurization specific pressure can be selected higher. The surface quality is required to be high, and the injection pressure can be selected higher.

2, structural characteristics: thin wall injection pressure can be selected higher: thicker than the pressure can be higher than the pressure. The shape is complicated, and the injection pressure can be selected higher. The process is good, and the injection pressure can be selected lower.

3, cast bronze alloy and die-casting mold temperature: alloy casting temperature is lower, die-casting mold temperature is lower, injection pressure can be higher than the pressure. When the temperature difference between the alloy liquid and the die-casting mold is large, the injection specific pressure can be higher.

4. Characteristics of die-casting alloy: The crystallization temperature range is wide, and the pressurization specific pressure can be selected higher. The fluidity is poor, and the injection pressure can be selected to be higher. The density is large, and the injection pressure is higher than the pressure and pressure.

All of the above factors affect the specific pressure of the cast bronze parts to varying degrees, which indirectly affects its quality. In order to produce good quality products while maintaining its excellent performance, pay attention to controlling the specific pressure.

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9/5/2019 - Talking about the daily cleaning work of copper castings

When the copper castings are processed, the surface must have contaminants. It is necessary to complete the cleaning work in time and try to do chemical protection as much as possible. Although you can't use thick grease directly, you can use some special protective oil, which can effectively protect. When you wipe it daily, do not use water directly, or use a soft cloth to avoid scratches.

The role of copper casting ribs is to increase the strength and rigidity of the parts after the wall thickness is reduced. It can prevent the shrinkage deformation of the castings during the operation and avoid deformation when the workpiece is ejected from the mold. The auxiliary circuit (the path of metal flow), the thickness of the die-casting rib should be less than the thickness of the wall where it is located, generally taking 2/3~3/4 of the thickness of the place.

Many structural parts are made of castings as blanks, and are closely related to the quality and precision of copper materials. The quality of copper castings has a vital impact on machine quality, life and accuracy. Copper castings can be used in valves, speakers, injection molding machines, water pipes, etc. At the same time, different molding processes can be used in the casting process.

Depending on the method of forming the copper casting, strict quality control of its molding and production process is required during casting. In fact, the surface quality of copper castings depends to a large extent on the quality of the molding. For example, surface defects such as sand, pores, blisters, and sandblasting, as well as surface roughness and dimensional accuracy of the castings are related to the quality of the molding. In order to reduce the occurrence of such defects, in addition to controlling the compactness of the mold, the mold must be evenly compacted.

During the processing of copper castings, the coupling from copper coupling manufacturers is an important part of plastic forming. The so-called cold extrusion refers to placing the copper blank into the mold cavity in the cold state under strong pressure and a certain speed. The copper is forced to be extruded from the cavity to obtain the desired shape, size, and extrusion with certain mechanical properties.

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