Cylinder head thermal shock test bench based on pre-tightening force, and method thereof

Abstract

The present invention discloses a cylinder head thermal shock test bench based on pre-tightening force, and a method thereof. The test bench comprises a test apparatus and a control system, wherein the test apparatus comprises a cylinder head requiring detection, bolts, a valve mechanism, infrared heaters, an insulation pad, a cylinder gasket, a sense heating coil, a pseudo body, a fixing table stand, a sense heater control system, an infrared heater control system, a water pump, a water tank, a heater, a thermostat, and the like. The cylinder head requiring detection is additionally provided with the valve mechanism. The cylinder head requiring detection, the insulation pad, the cylinder gasket and the pseudo body are sequentially connected, and are fixed with the bolts. The front side and the rear side of the cylinder head requiring detection are provided with the infrared heaters. The sense heating coil is arranged inside the pseudo body. The cylinder head requiring detection is connected with the water tank through a water pipe and is driven by the water pump. Forced water cooling is performed on the cylinder head requiring detection. The test apparatus is controlled by the control system. With the present invention, the pre-tightening force is considered as the mechanical constraint, such that the actual working conditions can be simulated realistically, and the thermal fatigue state and the thermal shock state of the cylinder head can be accurately analyzed so as to improve the credibility of the test results.

Description

technical field [0001] The invention relates to a thermal shock test bench considering pretightening force, in particular to a cylinder head thermal shock test bench considering pretightening force and a method thereof. Background technique [0002] With the continuous improvement of engine strengthening, especially the popularization and development of supercharging and other technologies, the problem of thermal load and mechanical load of engine cylinder head has become increasingly prominent, which directly affects the working reliability and service life of the whole machine. During the working process of the engine, most of the heated parts such as the cylinder head are subjected to the double test of the alternating thermal load and the mechanical load caused by the constraint of the pre-tightening force at the same time, and are relatively prone to thermal cracking and burning. The reliability of the cylinder head is mainly affected by the combined effect and influenc...

AI Technical Summary

Problems solved by technology

However, in the current research on the structural strength of components, the preload force is only used to detect the mechanical fatigue of internal combustion engine components, and it is not involved in the thermal simulation test. However, the internal combustion engine cylinder head must bear the preload under normal working conditions. Powerful

This ignorance of the effect of the pre-tightening force will cause errors between the actual working conditions. In the finite element simulation calculation, it is also found that the constraints of the pre-tightening force have an impact on the thermal deformation of the components. Therefore, the thermal shock simulation test of the cylinder head Neglecting the constraint of preload during the process will greatly reduce the credibility of the test results

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