The Cavitation Fault is Difficult to Solve, But the First Sample of AAK Hydraulic Pressure Control Valve is Successful

Update time : 2022-01-10 11:09:58

AAK hydraulic pressure control valve is made of 100Cr2 bearing steel, with high hardness and high wear resistance. It also adopts distinctive heat treatment process, to ensure that the hydraulic valve has no cavitation. It takes only 2 weeks to solve the customer complaint and helps Erich out of the dilemma.

Erich has been doing well in Linde company for several years. Recently, he was under great pressure due to a complaint. A hydraulic pump produced by Linde company went on strike after 8 months of use. The customer complained directly to the boss, who asked the after-sales department to find out the cause and solve it immediately. After inspection, the engineer found that mechanical damage had occurred on the metal surface of the pump, and the surface of the damage showed sponge like small holes, which should be caused by the hydraulic impact formed by the internal hydraulic system. At the same time, it was found that the hydraulic pressure control valve used in the system was the most serious, and no problems were found in other components. It was basically determined that the poor cavitation resistance of the hydraulic pressure control valve led to the strike. The boss asked Erich, who was responsible for the purchase of hydraulic pressure control valves, to re purchase hydraulic pressure control valves for these inoperable pumps within 20 days, to make sure no cavitation.

Erich contacted the original supplier of hydraulic pressure control valve and informed him of the whole situation. The original supplier mentioned that before production, Erich didn't inform the current working condition. To meet this working condition, materials must be customized, which would not be allowed by the time, because it would take at least 40 days. Erich also contacted a number of hydraulic valve manufacturers and got the replies that they either could not meet the quality requirements or the time would not be enough. This is troublesome. It's too late for the 20 days of time frame given by the boss.

Erich thought of AAK hydraulic valve, because he had a hydraulic pressure control valve sampled here last year, but didn't have any further contact due to AAK quotation was high. Erich asked by email whether AAK can solve the cavitation of hydraulic pressure control valve. According to the cavitation picture of the hydraulic pressure control valve provided by Erich and verifying the hydraulic working conditions, we replied that the materials used for this hydraulic pressure control valve need to be treated. However, AAK has inventory, because an American customer purchased similar hydraulic pressure control valves last month, we can send 4 samples of hydraulic pressure control valves within 14 days.

After Erich received the samples of hydraulic pressure control valve, their engineers installed it for debugging and it can work normally. Erich asked us to prepare materials quickly. His boss asked to replace all the hydraulic pressure control valves in this batch to avoid further complaints from customers. At the same time, he asked us to ensure that the mass production should be stable and there should be no cavitation.

The most important factor to avoid cavitation is the material selection of steel and the heat treatment of steel. According to the customer hydraulic working conditions, A AK selects 100Cr2 bearing steel and adopts carbonitriding heat treatment process. It is carburized at high temperature of 820-830 ℃ for 13 hours, then oil quenched, - 60 ℃ to - 70 ℃ cryogenic treatment and 150 ℃ to 160 ℃ tempering treatment. The whole molecular structure of the steel is uniform and the hardness can reach HRC68. After such heat treatment, the comprehensive properties are very stable, uniform hardness and good wear resistance. Wear resistance and high contact fatigue strength ensure no cavitation.