CN-120044120-B - Intelligent production system based on thermal fatigue detection of engine cylinder head

CN120044120BCN 120044120 BCN120044120 BCN 120044120BCN-120044120-B

Abstract

The invention relates to the technical field of cylinder head production, in particular to an intelligent production system based on thermal fatigue detection of an engine cylinder head, which comprises a production module, a thermal fatigue simulation module, a detection module and a control module, wherein the thermal fatigue simulation module is used for heating the cylinder head, the detection module is used for detecting the thermal fatigue degree of the cylinder head and comprises an ultrasonic assembly and a temperature measuring assembly used for detecting the air temperature around the cylinder head and the temperature of the inner wall and the outer wall of the cylinder head, the control module is used for determining an adjusting mode of ultrasonic detection according to the temperature difference of the temperature of the inner wall and the outer wall of the cylinder head and comprises the steps of adjusting the signal-to-noise ratio of the ultrasonic assembly or adjusting the height of an ultrasonic signal according to the electroacoustic efficiency of the ultrasonic signal or determining the distance between the ultrasonic assembly and the cylinder head according to the deviation of an echo signal and adjusting the alternate detection frequency of the ultrasonic assembly according to the cooling rate of the cylinder head. The invention realizes the improvement of the accuracy and the stability of detection.

Inventors

ZHAO HONGFU
XU TINGCHANG
Ye Zongyou
CHEN YAO

Assignees

湖北众旭机械科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250226

Claims (8)

1. An intelligent production system based on engine cylinder end thermal fatigue detects, includes the box, its characterized in that still includes: The production module is used for outputting a cylinder head; The thermal fatigue simulation module is arranged at the inner bottom of the box body and is used for simulating the thermal fatigue process of the cylinder head by heating the cylinder head output by the production module; the detection module is connected with the thermal fatigue simulation module and used for detecting the thermal fatigue degree of the cylinder head, and comprises an ultrasonic assembly and a temperature measuring assembly, wherein the ultrasonic assembly is used for carrying out ultrasonic detection on the cylinder head to determine whether the cylinder head generates cracks, and the temperature measuring assembly is partially connected with the cylinder head and used for detecting the air temperature around the cylinder head and the temperature parameters of the cylinder head; wherein the ultrasonic assembly comprises: A first ultrasonic transmitter disposed inside the tank; a second ultrasonic emitter disposed in parallel behind the first ultrasonic emitter; The first sliding block type telescopic rod is connected with the first ultrasonic emitter and used for adjusting the distance between the first ultrasonic emitter and the cylinder head and the height between the first ultrasonic emitter and the lower surface of the box body; The second sliding block type telescopic rod is connected with the second ultrasonic emitter and used for adjusting the distance between the second ultrasonic emitter and the cylinder head and the height between the second ultrasonic emitter and the lower surface of the box body; wherein the heights of the first ultrasonic emitter and the second ultrasonic emitter are equal to the height of the cylinder head; The temperature measurement assembly includes: the first temperature sensor is arranged on the inner wall of the cylinder head and used for detecting the temperature of the inner wall of the cylinder head; the second temperature sensor is arranged on the outer wall of the cylinder head and used for detecting the temperature of the outer wall of the cylinder head; The infrared thermal imaging thermometer is arranged above the second temperature sensor and used for detecting the air temperature between the first ultrasonic emitter and the cylinder head and between the second ultrasonic emitter and the cylinder head respectively; the control module is respectively connected with the thermal fatigue simulation module and the detection module and is used for determining an adjusting mode of ultrasonic detection according to the temperature difference of the temperature of the inner wall and the outer wall of the cylinder head, comprises adjusting the signal to noise ratio of the ultrasonic assembly according to the temperature difference change rate of the temperature of the inner wall and the outer wall of the cylinder head, Or, adjusting the height of the ultrasonic signal according to the electroacoustic efficiency of the ultrasonic signal, Or determining the distance between the ultrasonic assembly and the cylinder head according to the deviation amount of the echo signals, or adjusting the alternative detection frequency of the ultrasonic assembly according to the cooling rate of the cylinder head; The temperature difference change rate is the ratio of the difference value of the temperature of the inner wall of the cylinder head and the temperature of the outer wall to the unit detection time of the thermal fatigue simulation running period.
2. The intelligent production system based on the thermal fatigue detection of the engine cylinder head according to claim 1, wherein the control module is respectively connected with the temperature measuring component and the ultrasonic component for obtaining the temperature difference change rate of the temperature of the inner wall and the outer wall of the cylinder head in the detection stage, If the temperature difference change rate is larger than a preset second change rate, judging that the accuracy of ultrasonic detection is not in accordance with the requirement, and respectively reducing the signal-to-noise ratio of the first ultrasonic transmitter and the second ultrasonic transmitter.
3. The intelligent production system based on engine cylinder head thermal fatigue detection according to claim 2, wherein the signal to noise ratio is inversely related to the rate of change of the temperature difference.
4. The intelligent production system based on thermal fatigue detection of engine cylinder head according to claim 3, wherein the control module is connected with the ultrasonic assembly for preliminarily determining that the stability of signal transmission is not satisfactory and obtaining electroacoustic efficiency of the ultrasonic signal of the ultrasonic assembly under the condition that the temperature difference change rate is greater than a preset first change rate and less than or equal to the preset second change rate, If the electroacoustic efficiency is smaller than the preset first electroacoustic efficiency, the stability of the secondary judgment signal transmission is not in accordance with the requirement, the heights of the first ultrasonic emitter and the second ultrasonic emitter are respectively increased, Wherein the height is inversely related to the electroacoustic efficiency.
5. The intelligent production system based on engine cylinder head thermal fatigue detection according to claim 4, wherein the control module is respectively connected with the ultrasonic assembly and the infrared thermal imaging thermometer, and is used for preliminarily determining that the emission stability of ultrasonic signals is not satisfactory under the condition that the electroacoustic efficiency is greater than or equal to the preset first electroacoustic efficiency and less than the preset second electroacoustic efficiency, and calculating the deviation of echo signals of the first ultrasonic emitter and the second ultrasonic emitter, If the deviation is larger than the preset deviation, secondarily judging that the emission stability of the ultrasonic signals is not in accordance with the requirement, and respectively reducing the distances between the first ultrasonic emitter and the cylinder head and the distances between the second ultrasonic emitter and the cylinder head to positions meeting the detection temperature condition.
6. The intelligent production system based on engine cylinder head thermal fatigue detection according to claim 5, wherein the deviation amount of the echo signal is an absolute value of a difference value of peak sound pressure of the echo signal of the first ultrasonic transmitter after stopping heating of the thermal fatigue simulation module and the echo signal of the second ultrasonic transmitter after stopping heating of the thermal fatigue simulation module; The temperature detection condition is that in air temperature differences of a plurality of unit lengths of straight line distances between the first ultrasonic emitter and the second ultrasonic emitter and the cylinder head, the unit length end position when the air temperature difference is the maximum value; the air temperature difference in unit length is the difference between the air temperature at the end position of unit length and the air temperature at the starting position of unit length.
7. The intelligent production system based on thermal fatigue detection of an engine cylinder head according to claim 6, wherein the control module is connected to the temperature measuring component, and is configured to obtain a cooling rate of an inner wall of the cylinder head after heating is stopped by the thermal fatigue simulation module, and if the cooling rate is greater than a preset cooling rate, determine that stability of an echo signal is not satisfactory, and increase an alternate detection frequency of the first ultrasonic transmitter and the second ultrasonic transmitter.
8. The intelligent production system based on engine cylinder head thermal fatigue detection according to claim 7, wherein the alternate detection frequency is a number of alternate detections of the first ultrasonic emitter and the second ultrasonic emitter per unit detection time, and the alternate detection frequency is positively correlated with the cooling rate.

Description

Intelligent production system based on thermal fatigue detection of engine cylinder head Technical Field The invention relates to the technical field of cylinder head production, in particular to an intelligent production system based on thermal fatigue detection of an engine cylinder head. Background In the prior art, a cylinder head is a part of an engine, is arranged on a cylinder body, seals a cylinder from the upper part and forms a combustion chamber, is often contacted with high-temperature high-pressure gas and is subjected to great heat load and mechanical load, and the thermal fatigue test of the cylinder head is based on fatigue damage caused by the generation and release of thermal stress in the material in the process of repeated temperature cycles, wherein the thermal stress is mainly caused by the temperature difference of the inner surface and the outer surface of the cylinder head, when the cylinder head is heated, the compression stress is generated inside the cylinder head, and the tensile stress is generated outside the cylinder head, and the thermal fatigue test is opposite to the cooling process. The fatigue life of the cylinder cover material under the specific temperature cycle condition can be estimated through a thermal fatigue test, the crack forming and expanding mechanism is revealed, and the improvement and optimization of the cylinder cover structure are guided. CN111521565B discloses a crack opening width detection system and method based on laser ultrasound, the system comprises a sample (4) with a crack to be detected, an ultrasonic excitation device (1), a heating device (2), an ultrasonic detection device (3), a signal acquisition device (5), a motion device (6) and a control device (7), the ultrasonic excitation device (1) is used as an ultrasonic signal excitation source of the sample (4) with the crack to be detected, the heating device (2) is used for heating the crack to be detected on the sample (4) to generate thermal stress so as to close the crack, the ultrasonic detection device (3) is used for receiving ultrasonic signals, the signal acquisition device (5) is used for acquiring ultrasonic signals and transmitting the ultrasonic signals to the control device (7), the motion device (6) is used for driving a heating point of the heating device (2) on the crack to be detected and the crack to be detected to synchronously move, the control device (7) is used for adjusting the heating power of the heating device (2) and controlling the motion of the motion device (6) and is also used for obtaining displacement generated according to closure and displacement of the crack to be detected on the sample (4) to be detected, the ultrasonic signal acquisition device (5) is used for acquiring ultrasonic signals and transmitting the ultrasonic signals to the control device (7) to the control device to obtain the ultrasonic crack to be detected on the crack to be detected, and the crack to synchronously move The heating points irradiated to the crack to be detected by the heating device (2) and the detection points subjected to ultrasonic detection by the ultrasonic detection device (3) are positioned on the same straight line, and the straight line is perpendicular to the trend of the crack to be detected. Therefore, the crack opening width detection system and method based on laser ultrasound have the problems that the propagation speed of the sound wave is changed and the accuracy of detection is reduced due to high-temperature change in ultrasonic detection in thermal fatigue detection, and the propagation speed and direction of the sound wave are changed and even the attenuation of the intensity and the distortion of the phase of the sound wave are caused due to the fact that the air layers with different temperatures are encountered in the propagation process of the sound wave due to the fact that the temperature gradient occurs in the detection environment. Disclosure of Invention Therefore, the invention provides an intelligent production system based on thermal fatigue detection of an engine cylinder head, which is used for solving the problems that in the prior art, the propagation speed of sound waves is changed and the accuracy of detection is reduced due to the fact that high-temperature gas is encountered in the thermal fatigue detection, and the propagation speed and direction of sound waves are changed and even the attenuation of the intensity of the sound waves and the distortion of the phase are caused due to the fact that temperature gradients occur in the detection environment and the sound waves encounter air layers with different temperatures in the propagation process. In order to achieve the above purpose, the invention provides an intelligent production system based on thermal fatigue detection of an engine cylinder head, which comprises a box body and further comprises: The production module is used for outputting a cylinder head; The thermal fatigue s