Mechanical processing industry, hydraulic transmission is widely used, such as various types of semi-automatic transmission hydraulic lathe. These machines are often used in the process, such as impact, crawling and other failures, diagnosis and maintenance, often in the hydraulic control components (such as various types of pumps, valves) can not find the cause of the malfunction, resulting in maintenance work in trouble. In the end such failures are often found in the implementation of the reasons for the components, namely the cylinder piston seal components due to serious wear and tear. This phenomenon especially in the "O" ring see more. A CE7120 hydraulic profiling lathe, in the work there profile knife lead down to longitudinal feed cutting knife, resulting in a knife, the phenomenon of frequent waste, the machine can not work properly. Detection and Maintenance: Check the hydraulic control components are faultless, maintenance work temporarily into the blind spot. Disassemble the longitudinal cylinder of the turret and found that the outer circle of the O-shaped seal of the piston oil seal has been polished. At the same time, it is found that the outer diameter of the piston does not meet the requirements of the machine tool manufacturing reason, the diameter direction is smaller than the standard size of 0.8mm, Large, leading to the vertical cylinder oil interoperability channeling. Maintenance, the replacement of qualified piston and the "O" ring after the machine tool punching troubleshooting. Analysis of the reason is that the knife in the profile cutter down into place in the moment, the whole knife by a force F ', the force after the decomposition of a horizontal thrust F'1 acting on the longitudinal cylinder piston rod, at the same time, the solenoid valve 34E1-25B work, the longitudinal cylinder rod chamber connected to the pressure oil, rodless chamber connected to speed control hydraulic valve back to the oil circuit, the piston rod chamber force F is completed by two parts, one for F'1 and the other for F1 = A1P1, where A1 is the force-receiving area of ​​rodless cavity, then F = F'1 + F1. Under normal circumstances, the piston under the action of force F began to move to the rodless chamber, due to the incompressibility of hydraulic oil, rodless cavity hydraulic oil pressure suddenly increased to the piston to form a back pressure, the piston force balance by speed control valve Set a smooth pace of the knife. The moment because of the role of% F'1, longitudinal cylinder bore pressure P2 will be greater than P1. In fact, the two chambers of the cylinder are channeling through the gap. At the moment of P2> P1, the hydraulic oil tends to flow from the rodless chamber of the high-pressure zone to the rod chamber of the low-pressure zone. Once the flow occurs, P2 decreases, P1 increases and F1 increases Large, piston force loss of balance, the piston-driven turret quickly move to the direction of the rod-free chamber. And after an instant, due to the end of the profiled turret down, the horizontal thrust F'1 acting on the longitudinal cylinder piston disappears on its own, the piston moves quickly and the turret moves smoothly, and the punching phenomenon is over.
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