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What are the die casting tolerances?

October 20, 2023

What are the die-casting tolerances?
Die casting tolerances (tolerances) depend on several factors, including the alloy used, the size and shape of the part, and the specific requirements of the manufacturing process. Typically, the tolerances on die-cast parts are often looser than other manufacturing methods such as milling or turning, as the die-casting process can introduce some variation and uncertainty.

Tolerances are usually defined according to international standards (such as ISO standards) or related industry standards, which provide tolerance ranges for specific types of parts and applications. Tolerances are usually divided into the following areas:

1. Dimensional tolerance: Describes the maximum and minimum deviation allowed in the linear dimensions of a part. This includes diameter, length, width, etc.

2. Shape tolerance: Describes the maximum allowable deviation in the shape of a part, such as flatness, roundness and straightness.

3. Surface quality tolerance: Describes the allowed defects and unevenness on the surface of the part, such as surface roughness and the number and size of defects.

4. Position tolerance: Describes the deviation of the position of a specific feature on a part relative to other features.

5. Parallelism and perpendicularity tolerance: Describes the parallelism or perpendicularity between part planes or features.

The selection of tolerances often depends on the design needs and use of the part. For some applications, such as high-precision parts or parts that need to fit precisely with other parts, tolerances may be relatively small. For some general industrial applications, tolerances can be looser. Die-cast manufacturing is often affected by material properties, mold design and manufacturing processes, so these factors need to be considered during the design stage to ensure the part will meet requirements. Therefore, specific die-casting tolerances can vary widely depending on the part and manufacturing process. During the design and manufacturing process, working with the die-cast manufacturer is key to ensuring the parts meet the required quality standards.

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