Lost foam casting production low-carbon steel upper core disc and impact seat processing method

Abstract

The invention discloses a lost foam casting production low-carbon steel upper core disc and impact seat processing method. The method comprises the following steps: making foam polystyrene EPS into a foaming member, which has the same shape as a cast and is a little bigger than the cast; painting a plurality of fireproof coatings on the surface of the foaming member, placing the foaming member in non-adhesive moulding sands, carrying out casting on the foaming member, wherein during the casting process, the foam polystyrene EPS foaming member is burnt and gasified under the assistance of vacummizing and vibration during the casting process, and finally the molten liquid replaces the foaming member as the cast. The lost foam technology is used to manufacture upper core disc and impact seat, is capable of reducing the metal tissue defects and improving the compactness and anti-fatigue strength of metals, moreover has the advantages of high precision in size, reducing on cleanness, reduced processing time, compact tissue of products, suitability for massive production, and high automation, can greatly improve the operation environment, and has greater advantages and a vaster prospect, compared to the conventional manufacture technology of upper core disc and impact seat.

Description

technical field

[0001] The invention relates to the field of casting technology, in particular to a method for producing a low-carbon steel upper core plate and impact seat by lost foam casting. Background technique

[0002] The impact seat is an important load-bearing and impact-resistant part on the railway vehicle. In the past, the sand casting process was used, and there were generally defects such as poor surface smoothness, low dimensional accuracy, shrinkage, subcutaneous pores and inclusions, especially cracks. The impact toughness, fatigue strength and other mechanical performance indicators have adverse effects. The upper core plate has the characteristics of large volume, small batch production, compact internal structure, high strength and high fatigue resistance. Because forgings have strong advantages in internal structure and mechanical properties, forging technology is often used to manufacture key parts on heavy-duty railway vehicles. Although the use of f...

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