Thermal fatigue test device of piston

Abstract

The invention discloses a thermal fatigue test device of a piston. The thermal fatigue test device is composed of a support frame, a non-standard piston tool, a tested piston, branch cooling water pipes, a thermal insulation board, and a main cooling water pipe. With the non-standard piston tool, the mechanical constraint of the tested piston on actual assembling condition is simulated completely;on the basis of cooperation of the cooling pipes, the thermal insulation board, and an external heating device, the temperature field of the tested piston on the actual working condition is simulatedcompletely. Thermal fatigue testing of pistons with different numbers is realized by flexible cooperation of the support frame and the tool. With the thermal fatigue test device disclosed by the invention, the actual assembling condition and cooling environment of the piston can be simulated fully; the arrangement condition can be adjusted flexibly based on the number of the tested pistons; the progress of the thermal fatigue test of the piston is controlled reasonably; the usage energy is optimized; and the credibility of the thermal fatigue test result of the piston is enhanced substantially.

Description

technical field [0001] The invention belongs to the technical field of engine detection, in particular to a piston thermal fatigue test device. Background technique [0002] The piston is one of the parts with the worst working conditions in the engine. With the improvement of engine strengthening, especially the popularization and development of supercharging and other technologies, the thermal load and mechanical load of the piston are increasing, which directly affects its service life. . In order to better develop and design the piston, it is necessary to accurately evaluate the thermal state and thermal fatigue reliability of the piston during work. [0003] In the existing piston thermal fatigue test device, the tested piston is usually in a free state. When thermal deformation occurs, no thermal stress in line with the actual working conditions is generated. Only the internal thermal stress of the piston is considered, which reduces the possibility of fatigue testing...

AI Technical Summary

Problems solved by technology

[0003] In the existing piston thermal fatigue test device, the tested piston is usually in a free state. When thermal deformation occurs, no thermal stress in line with the actual working conditions is generated. Only the internal thermal stress of the piston is considered, which reduces the possibility of fatigue testing. Reliability

At the same time, the cooling of the existing piston thermal fatigue test device is usually external cooling, and the piston head is cooled by means of external water spray or air jet. Inconsistent cooling methods will lead to errors between the thermal fatigue life obtained in the test and the actual thermal fatigue life

In addition, the existing piston thermal fatigue test devices are relatively fixed in structure, and most of them can only test a single piston, while the devices that can test multiple pistons at the same time cannot flexibly adjust the number of pistons to be tested, and there is a waste of testing resource situation, failed to achieve good resource utilization, increased test costs

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