Cold and hot fatigue test method and device for engine cylinder cover assembly

Abstract

The invention provides a cold and hot fatigue test method and device for an engine cylinder cover assembly, and belongs to the technical field of engine cold and hot fatigue tests.The method comprisesthe steps that the engine cylinder cover assembly is connected into an induction heating system and a cooling liquid circulation system; low-temperature air exhausted outwards by the engine cylindercover assembly is changed into high-temperature air after being inductively heated by the induction heating system, and the induction heating system inputs the high-temperature air into the engine cylinder cover assembly again so as to heat the firepower surface of the cylinder cover to the preset high temperature. And the cooling liquid circulating system cools the firepower surface of the cylinder cover to a preset low temperature by utilizing the cooling liquid which circularly flows in the cooling liquid circulating system and contains the nano copper powder. And the induction heating system and the cooling liquid circulating system are used for repeatedly heating and cooling the cylinder cover until cracks appear in the nose bridge area of the cylinder cover. The device has the advantages that the heating and cooling process of the engine cylinder cover assembly in actual work is accurately simulated, and the problem that an existing cold and hot fatigue test is low in efficiencyis solved.

Description

technical field [0001] The present application relates to the technical field of thermal fatigue testing of engines, in particular to a thermal fatigue testing method and device for an engine cylinder head assembly. Background technique [0002] The existing test for testing the thermal fatigue performance of the engine cylinder head is the engine thermal shock bench test. The thermal shock bench test is usually used to judge the performance of the whole engine, and does not test the ultimate performance of individual parts. [0003] The thermal fatigue test is a thermal fatigue performance test completed in a short period of time by simulating the thermal state of the heated parts of the engine and strengthening the test conditions. It has the advantages of short test period and low cost. The parts involved mainly include cylinder head, piston and valve. Tappets, etc., the heating methods mainly include infrared heating, flame heating, etc. The accelerated cold and heat fa...

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Problems solved by technology

[0008] In view of the defects existing in the prior art, the purpose of this application is to provide a thermal fatigue test method and device for an engine cylinder head assembly, which can accurately simulate the heating and cooling process of the engine cylinder head assembly in actual operation, so as to solve the problem of existing cooling The problem of low thermal fatigue test efficiency

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