A method for testing the corresponding relationship between the pressure in the sand casting cavity and the vent hole

Abstract

A method for testing the corresponding relationship between the pressure in the sand casting cavity and the vent hole. The steps are: preparing experimental equipment, which includes sand molds, high-pressure gas bottles, gas pipes, copper pipes, vent needles and pressure gauges; using molding sand Seal and fix a copper pipe to the middle of the sprue. The copper pipe is connected to the high-pressure gas bottle through a gas pipe. Use molding sand to seal and fix another copper pipe to the riser. The copper pipe is connected to the riser through a gas pipe. The air pipe is sealed and connected with a pressure gauge; select an equal number of vent needles, pressure gauges and air pipes according to the number of vent holes on the sand mold; use sealant to seal and fix the vent needle into the vent hole, and the vent needle passes through A gas pipeline is sealed and connected with a pressure gauge; all vents are assembled as mentioned above; the output pressure of the high-pressure gas cylinder is adjusted to 5kPa, the pressure data is recorded, and the pressure in the sand casting cavity and the vent is obtained Correspondence; replace the sand mold and repeat the test process.

Description

technical field [0001] The invention belongs to the technical field of sand casting, in particular to a method for testing the corresponding relationship between the pressure in the sand casting cavity and the pressure at the vent hole. Background technique [0002] Casting is a process of injecting liquid alloy into the mold to cool and solidify it to prepare castings. Among various types of mechanical products, castings account for a large proportion of the weight of the whole machine. Therefore, casting is the basis of modern equipment manufacturing industry. It is also the foundation of the machinery industry and occupies an important position in the construction of the national economy. [0003] Sand casting is the most widely used casting method. It has the advantages of wide adaptability and low cost. While sand casting serves social development, it also has some negative effects, such as environmental pollution, poisoning, burns, explosion accidents, etc., while sand...

AI Technical Summary

Problems solved by technology

[0007] Since the air pressure testing equipment cannot be directly placed on the inner surface of the mold cavity, because this will cause the sand on the inner surface of the mold cavity to fall off, resulting in sand sticking and slag inclusion defects, but at present, the air pressure testing equipment is usually placed directly on the vent hole of the upper sand mold , and use the pressure at the vent to represent the pressure in the casting cavity

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