The processing difficulty of hydraulic relief valves with deep hole is a pain point in the industry. The greater the length diameter ratio, the greater the difficulty. Pablo, an American Hydraulic customer, has recently been besieged by an order for hydraulic relief valves with a length diameter ratio of 11:1. The original hydraulic relief valve manufacturer confirmed that the processing quality could be guaranteed during the quotation. However, in the actual proofing, it could not overcome the difficulty of deep hole. 3 proofs and 3 failures wasted 8 weeks. However, his customer had been pushing for the samples, and Pablo was in a dilemma. Pablo had to find new hydraulic relief valve manufacturers. Within 2 days, he contacted nearly 30 hydraulic cartridge valve manufacturers. All of them said that they can only produce hydraulic relief valves with a length diameter ratio of 5:1. Pablo realized that trouble was coming and was worried.
Pablo learned that his friend Caleb purchased high-precision hydraulic cartridge valves from AAK, so he contacted us. According to the e-mail instructions and drawings of hydraulic relief valve sent by Pablo, the parameter requirements are high, that is, the tensile strength of hydraulic relief valve is 300N/cm², the compressive strength is 540N/cm², the clearance between the valve hole and the valve body is between 0.005 and 0.015mm, and the valve hole diameter is between Φ10~Φ41mm, the length of the valve body is 70mm, the maximum length diameter ratio is 11:1, and the dimensional accuracy of the valve hole is H6 ~ H7. When I saw the requirements of this hydraulic relief valve, I knew that most hydraulic valve manufacturers could not process it. Even if it is processed, its accuracy is a hidden danger.
After internal discussion of AAK technical team, I replied to Pablo that AAK could send samples of hydraulic relief valves in 3 weeks, and the parameters could meet the requirements of the drawings. I felt Pablo's skepticism. Maybe the original hydraulic relief valve manufacturer also said like this but did not do it. He repeatedly emphasized the processing of the length diameter ratio and the accuracy requirements. After 20 days, AAK sent 6 samples of hydraulic relief valves. Pablo approved AAK hydraulic relief valve samples on the 5th day after receiving the samples. At the same time, he is curious that the original manufacturer failed in making samples of this hydraulic relief valve with the length diameter ratio of 11:1 for 3 times, but AAK succeeded at one time.
The reason why AAK can produce the hydraulic relief valves with a large length diameter ratio mainly due to the following 3 points:
1. The long drill bit of W12Cr4V4Mo high-performance high-speed steel is selected to replace the conventional carbon tool steel drill bit. The hardness and heat resistance of the drill bit are increased by more than 1 times, and the impact toughness is also increased by 2-3 times.
2. During deep hole machining, the chips are not easy to be discharged, easily blocked or even broken. After grinding, the AAK bit reduces the resistance, and then cooperates with the cutting fluid to drill, which completely solves the chip accumulation.
3. According to the length diameter ratio, reasonably select the drilling amount, which is a skill.
AAK hydraulic relief valves, good at deep hole processing, no deformation, welcome to try!
AAK HYDRAULIC CARTRIDGE VALVES (313) 2022-08-09
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