Service HotlineWith the continuous development of various industries, zirconia ceramic cylinder liners have gradually been widely used. So in the application process, deformation of zirconia ceramic cylinder liner is an important problem that troubles drivers. Today we will introduce several methods for detecting deformation of zirconia ceramic cylinder liners:
Zirconia ceramic cylinder should be inspected using a tester: the main pin holes and spring seats at both ends of the tester are used as positioning inspection benchmarks. Fix the instrument on two leaf spring seats, insert the inspection rod into the two main pin holes, and operate the instrument to make contact between the measuring head and the inspection rod. By using different scales, the mutual position (angle) between the main pin hole and the leaf spring seat, as well as between two leaf spring seats, can be reflected. Check and determine the location and degree of deformation. Please refer to the instrument manual for specific methods and usage steps. Place the front axle on the two V-shaped irons on the flat plate and place the level gauge on the steel plate spring seat. If the level is placed horizontally (perpendicular to the front axle) and the bubble is not in the center, it indicates that the front axle is twisted; If the bubble is not centered when the level is placed vertically, it indicates that the front axle is bent.
Use a square ruler to check the zirconia ceramic cylinder: insert the test rod into the main pin hole, place a shim on each of the two steel plate spring seats, and place a square iron on the shim. The angle of the square iron should be adjusted and fixed within the specified range of each model. Then, let the square stand upright and the edge shell occupy the test bar to find the result. If there is a gap at the upper end, it indicates that the front axle is bent downwards, and if there is a gap at the lower end, it indicates that the front axle is bent upwards. In addition, whether the front axle is bent or twisted back and forth can be determined by the alignment of the line between the square and the pad, as well as the alignment between the square and the test bar.
3. Cable inspection for zirconia ceramic cylinder: Place the front axle in a horizontal position, draw the center lines of two steel plate springs, hang a heavy hammer at both ends of the line, and thread the lines through the centers of the two main pin holes. Measure the distance between the plane of two leaf spring seats and the straight line with a ruler, and the difference between the two is the straightness of the crossbeam. Check if the centerlines of the two cable sockets are on the same straight line. Check if there is any deviation in the distance between the positioning center holes of the two seats and the straight line. If there is a deviation, it indicates that the beam is distorted. Check the distance between the inner end of the plane on the main pin hole and the straight line. If there is an error between the two distances, the angle of the main pin is incorrect. Measure the distance between two leaf spring seats and the thin wire with a ruler. If they are not equal and the centers are not on the same straight line, it indicates that the two ends of the front axle are bent up and down, or bent forward and backward.
And the malfunction that cannot be started. After disassembling the diesel engine, it was found that all six wet zirconia ceramic cylinder liners had varying degrees of pitting corrosion, and some parts had more severe pitting corrosion. The reason for cavitation of zirconia ceramic cylinder liner in this machine is that the cavitation area of zirconia ceramic cylinder liner appears on both sides of the outer surface of the zirconia ceramic cylinder liner in the direction of the connecting rod swing, with a honeycomb shaped hole group with a diameter of 1-5 mm and a depth of 2-3 mm. The main reasons for the pitting corrosion of zirconia ceramic cylinder liners are as follows:
When the impact vibration diesel engine is working, the zirconia ceramic cylinder liner is subjected to vibration, and the outer wall cooling water generates local high pressure and high vacuum, which then evaporates to form small bubbles attached to the outer wall of the zirconia ceramic cylinder liner. When the bubbles burst, a large impact pressure is generated. The outer wall of zirconia ceramic cylinder liner has been subjected to repeated strong shock and vibration of pressure wave for a long time, and its metal surface has fatigue damage, which first produces pitting, and then expands into foam or sponge like cavitation, or even perforation.
Manufacturing errors specifically include: excessive clearance between zirconia ceramic cylinder liners and cylinder body holes; The clearance between the piston and the zirconia ceramic cylinder liner is too large; Deformation of connecting rod and excessive axial clearance of crankshaft; The zirconia ceramic cylinder liner wall is relatively thin, the material is poor, and the manufacturing process has defects.
The cooling water is often contaminated with impurities and heavily polluted hard water, which can easily cause corrosion and damage to the zirconia ceramic cylinder liner. The temperature of the cooling water is too low, the cooling water is insufficient, and mixing different cooling liquids can accelerate the damage of the outer wall of the zirconia ceramic cylinder liner.
During the operation of a chemical corrosion diesel engine, iron in the gas and iron carbide form micro cells at the higher temperature parts of the zirconia ceramic cylinder liner, resulting in chemical corrosion. Combined with impact and vibration, it accelerates the corrosion and pitting of the zirconia ceramic cylinder liner.
Preventive measures should be taken to reduce pitting corrosion of wet zirconia ceramic cylinder liners in diesel engines, mainly from the aspects of manufacturing, maintenance, and use. Improving the quality of repair and assembly, including cylinder block assembly, piston connecting rod assembly, crankshaft flywheel assembly, etc., and enhancing the dynamic balance of diesel engines can reduce the vibration intensity of zirconia ceramic cylinder liners.
The design and manufacturing departments should take measures in structural design, material selection, processing technology, and surface processing quality to improve the corrosion resistance and wear resistance of zirconia ceramic cylinder liners. Coating a protective layer on the outer wall of the zirconia ceramic cylinder liner can improve its ability to resist pitting corrosion.
Reducing impact vibration by adjusting the injection advance angle, injection pressure of the injector, and the uniformity of fuel injection in each cylinder to meet technical requirements can reduce the impact of the piston on the zirconia ceramic cylinder liner.
Reasonable use of coolant: The coolant temperature should not be too high or too low, and should be maintained within the range of 80-90 ° C. Soft water should be consistently used and the cooling water should be kept clean to promptly remove dirt from the water jacket.
