Grinder shell cover casting method

Abstract

The present invention discloses method of casting end cap for mill. The present invention can ensure high casting quality by means of connecting external chill in thickness of 0.6-0.8 time the hot pitch circle diameter, applying the external chill with sand layer of 10-15 mm thickness, inwards shifting the hot pitch circle in the round corner region to avoid microscopic shrinkage to affect magnetic particle inspection, and ensuring the shrink passage with proper divergence angle for solidification in the order from far parts to the sink head.

Description

Technical field: [0001] The invention relates to the technical field of mill equipment manufacture, in particular to a casting method of a mill end cover. Background technique: [0002] The material of the end cover of the mill is low-carbon cast steel, which has a wide range of solidification temperature and poor casting performance. Its solidification characteristics determine that castings are prone to defects such as shrinkage cavities and micro-shrinkage porosity. [0003] According to the working nature of the mill and the structural characteristics of the end cover itself, it can be seen that the end cover is the main bearing part of the mill. During the work, the weight of the mill and the weight of the material are supported by the journals of the end covers at both ends. The casting quality requirements are particularly strict, and the main defects that are prone to occur during the working process of the fillet area of ​​​​the end cover and the main defects are: ...

AI Technical Summary

Problems solved by technology

[0005] (2) It is the hot section area of ​​the end cover casting, which is prone to internal defects and surface cracks;

[0006] (3) Defects are mostly buried under the skin of the fillet area of ​​the steel casting, partly exposed on the surface after processing, and partly in the center of the workpiece thickness in the fillet area;

However, since the small wall thickness arm is at one end of the large wall thickness arm, and the wall thickness is small, the effect of cold iron is not very strong

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