Method for casting municipal inspection well cover through ultrasonic-assisted V method

Abstract

The invention discloses a method for casting a municipal inspection well cover through an ultrasonic-assisted V method. Compared with a traditional wet filming technology, the machining difficulty isreduced, the sand core number is decreased, the cost is reduced, the complexity of technological operation is reduced, and the casting defects such as sand burning, pores, sand holes and sand expansion are reduced. According to the method, in the cast iron smelting process, ultrasonic treatment is additionally conducted in the nodulizing process, a cavitation effect occurs, the temperature of surrounding liquid falls slowly through ultrasonic vibration, dendritic crystals grow slowly, and short and thick graphite strips are formed; and meanwhile, ultrasonic treatment is additionally conductedin the solidifying process after pouring, a casting is cooled slowly through the acoustic cavitation effect and the heat effect of ultrasonic treatment, therefore, a carbon-poor layer in a pipe body and carbon in a solution are conditionally balanced through diffusion, the prepared cast iron is uniform in graphite component size, high in roundness rate and low in ferrite content, the comprehensivemechanical properties of ductile iron are improved, and then the prepared ductile iron well cover has the good mechanical property.

Description

technical field [0001] The invention relates to the technical field of manhole cover manufacturing, in particular to an ultrasonic-assisted V-method casting method for municipal inspection manhole covers. Background technique [0002] With the rapid development of modern science and technology and social economy, urban construction is gradually accelerating, and the scale of the city is constantly expanding. Various road facilities have gradually entered into standardized and standardized management. The market demand in construction is increasing. Since the manhole cover is a closure leading to the top of the entrance and exit of underground facilities, all urban roads, highways, tap water, drainage, telecommunications, electricity, fire hydrants, valves and other public facilities need to install manhole covers. Most of the materials used for manhole covers used to be reinforced concrete, but due to the defects of high brittleness, easy aging, and easy fracture of reinfor...

AI Technical Summary

Problems solved by technology

The castings cast by the wet casting process have casting defects such as sand inclusions, scars, rat tails, sticky sand, pores, trachoma, and sand swelling. The problem of high cost of subsequent processing of castings is also more serious