Method and device for leak test of rising pipe

Abstract

The invention provides a method and device for leak detection of a riser tube. The method includes: obtaining a start signal for a leak test of a riser tube; position, adjust the casting machine to the simulated production state, and use the furnace pressure control valve to control the compressed air to enter the furnace body, so that the interior of the furnace body can be pressurized and maintained according to the preset pressurization stage; during the pressurization process and the pressure maintenance process , according to the state of the liquid in the riser tube, determine whether the riser tube is leaking. Through the technical solution of the present invention, the phenomenon of mold unloading and production termination caused by the leakage of the riser pipe is reduced, which is beneficial to save manpower, material resources and production time, and can preventively solve the problem of riser pipe leakage and reduce downtime. The automatic detection can be realized, and the detection is accurate, the effect is good, the operation is simple, and the safety factor is higher.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a leak test method for a riser tube and a leak test device for a riser tube. Background technique [0002] Low-pressure casting is a method in which liquid metal fills the mold cavity from bottom to top along the riser under the action of dry air pressure to form a casting. Because of the low pressure used in the entire casting process, it is called low-pressure casting. [0003] In low-pressure casting, the stability and accuracy of pressure are the most important factors in low-pressure technology, which will have a significant impact on production management and product quality. The actual pressure caused by pressure leakage is lower than the pressure required by the process, which is also the most important factor affecting pressure stability and accuracy. [0004] Air leakage at the riser pipe is one of the causes of pressure leakage. However, the judgment of the air lea...

AI Technical Summary

Problems solved by technology

However, the judgment of the air leakage at the existing riser pipe can only be guessed by the defect form of the product, and the misjudgment rate is very high, which will also cause serious impact on production. Artificially judge whether the riser pipe is Leakage, the risk of misjudgment is very high. In addition, once the riser leaks, the mold will be unloaded and the production will be terminated, and it cannot be prevented in advance.

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