Cutting method of special alloy cast iron

Abstract

The invention relates to a cutting method of special alloy cast iron. The cutting method is characterized by comprising the following steps of: welding low-carbon steel weld metal with the width of between 15 and 20 millimeters at a position needing to be cut on the inner surface of a special alloy iron casting by using manual arc welding; performing flame cutting on the weld metal and the special alloy iron casting which is connected with the weld metal and has the fusion depth of between 3 and 5 millimeters by using oxygen-acetylene; welding low-carbon steel weld metal with the width of between 15 and 20 millimeters on the surface of the special alloy iron casting which is exposed out of a cutting position by using manual arc welding; performing flame cutting on the weld metal and the special alloy iron casting which is connected with the weld metal and has the fusion depth of between 3 and 5 millimeters by using oxygen-acetylene; and repeating the steps until a required cutting size is achieved. The cutting method has the characteristics of saving capital and meeting the requirements of a specific working state.

Description

technical field [0001] The invention relates to the technical field of cutting special alloy cast iron, in particular to a cutting method for special alloy cast iron. Background technique [0002] During the long-term production process of the H8800 crusher produced by the Swedish Sandvik Company, it was found that the special alloy iron castings of the upper frame assembly arm frame were seriously deformed and had to be replaced. If the overall bearing arm frame of the upper frame body is replaced as a whole, the cost is expensive and the cost is too high, so only the special alloy cast iron part of the upper frame body overall bearing arm frame has to be replaced. However, since the material of this special alloy cast iron is special alloy cast iron, it is known through consulting the data that the chemical composition of the material of the special alloy cast iron of the upper frame body of the H8800 crusher is: C3.2~3.6, Si1.3~1.8 , Mn0.5~1.0, P≤0.3, S≤0.15, Cu0.6~1.1, ...

AI Technical Summary

Problems solved by technology

For example, the scheme of using two hydraulic jacks to push it out by mechanical force failed after hard work; the method of cutting the inner sleeve by arc gouging and taking it out failed after field practice; the selection of manual arc welding cutting and oxygen-acetylene gas cutting also failed It worked; using dry ice to quickly cool the inner sleeve of the arm frame to shrink, and then add mechanical force to pressurize and take it out, but it failed after 12 hours of freezing