The manufacturing of Dalian castings is usually divided into three main processes: mold making, melting casting, and post treatment. Firstly, mold production is carried out, and corresponding molds are made based on the shape and size of the castings. During casting, a setting agent is added to the mold, placed in a furnace to melt, and then poured into the mold. After the metal cools and solidifies, the casting can be obtained. Post treatment is required for castings, including processes such as sand removal, trimming, and cleaning.

One of the advantages of cast parts is that they can manufacture complex shaped components and have relatively low production costs. In addition, during the casting process, the performance of the material can be adjusted by controlling its composition and cooling rate to meet different engineering needs. Moreover, cast parts usually have more compressive and corrosion resistance than forged and welded parts.

How to identify and avoid common defects in Dalian castings?

The common defects in castings mainly include pores, inclusions, shrinkage cavities, and sand inclusions. Porosity refers to multiple irregularly shaped gas cavities within a casting, typically occurring at locations where air cannot be expelled between the metal liquid and the mold during the pouring process. Inclusions refer to impurities or non-metallic inclusions present in castings, usually caused by impure materials or metal contamination. Shrinkage refers to the depression or hole inside a casting, usually caused by uneven volume shrinkage during material solidification. Sanding refers to the adhesion of sand particles with a certain thickness between the mold wall and the casting, usually caused by poor quality or too thick coating of the mold.

Identifying common defects in castings can be achieved through the following methods:

Visual inspection: By observing the appearance and cross-section of the casting with the naked eye, obvious defects such as pores and inclusions are found.

Sound detection: Using the method of striking or striking the casting, listen to the sound to determine whether there are defects. Defects usually produce sound that is different from the normal area.

X-ray testing: Using X-ray transmission properties to observe the internal defects of castings. This method can detect hidden defects that cannot be detected through visual observation.

The casting process of castings can be divided into several forms, such as die casting, casting, and continuous casting. Die casting refers to the process of injecting molten metal or alloy into a metal mold or casting mold, and cooling and solidifying it under a certain pressure. The die-casting process is suitable for producing castings with complex shapes and precise dimensions. Casting refers to pouring molten metal or alloy into sand, metal, or ceramic molds, and cooling and solidifying them into shape through the action of gravity or pressure. The casting process is suitable for producing large and large-scale castings.

A casting is an industrial manufacturing component formed by melting metal or alloy and flowing it into a mold, which is cooled and solidified. Castings are widely used in various fields, including automobiles, aerospace, shipbuilding, construction, machinery, etc. The quality control of castings is mainly carried out through testing and inspection. Common testing methods include X-ray testing, ultrasonic testing, magnetic particle testing, etc. to ensure that the casting meets design and usage requirements.