Lost Foam Casting Method of Ultrasonic Vibration Resin No-bake Sand

Abstract

The invention provides an evaporative pattern casting method and device for ultrasound vibration resin self-hardening sand and belongs to the field of special precision casting. The method includes the steps that dry sand used in traditional evaporative pattern casting is changed into resin self-hardening sand, an ultrasonic wave generation system is introduced, a sine signal generated by an ultrasonic wave generator is converted into high-frequency mechanical vibration through an ultrasonic wave amplitude-variable bar connected with the ultrasonic wave generator, and high-frequency mechanical vibration acts on a sand box wall auxiliary resin self-hardening sand evaporative pattern modeling. The method includes the steps of manufacturing a foamed plastic model, painting a coating, performing sand box modeling, performing ultrasonic wave compaction, performing vacuumizing, burning the foamed plastic model through flames, performing vacuum negative-pressure pouring and performing the shakeout working procedure. By the adoption of the evaporative pattern casting method and device for ultrasound vibration resin self-hardening sand, the defects of sand crushing and recarburization can be overcome remarkably, the problems that most of castings are each of a dendrite structure, shrinkage and loosening are generated, and mechanical property is lower are solved, and the functions of grain refining, gas discharging and segregation reduction can be achieved.

Description

technical field [0001] The invention belongs to the field of special precision casting, and in particular relates to a lost foam casting method of ultrasonic vibration resin self-setting sand and a device thereof. Background technique [0002] Resin no-bake sand has been widely used in the foundry industry in my country, and the technology of process equipment has reached a fairly mature level. With the development of my country's machinery industry, many manufacturers use resin self-setting sand to produce castings, and lost foam casting is a green and clean casting process without binders, which has practical significance for the realization of green and clean production of sand casting. In addition, the choice of casting process is very important. It is necessary to ensure the quality of castings and meet the requirements of dimensional accuracy and surface finish. The resin self-setting sand lost foam process is not widely used in domestic casting production. However, r...

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Problems solved by technology

[0003] In addition, the traditional vibrating lost foam casting method using a vibrating table to vibrate can reduce the viscosity of the metal melt and improve the fluidity, which helps to reduce the occurrence of insufficient pouring and cold shut, but the cooling speed is fast for thin-walled parts after pouring , the crystallization time is short, so that the grain refinement effect brought by vibration is not obvious; at the same time, the anti-seismic performance of the coating is required to be improved, and the excessive vibration force may easily cause defects such as box collapse and sand inclusion.

Some people even think that strong vibration will aggravate alloy hole defects, vibration will coarsen acicular eutectic silicon, resulting in reduced alloy performance, etc.

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