Position control mode and force control mode interaction axial friction welding device and friction welding technology

Abstract

The invention discloses a position control mode and force control mode interaction axial friction welding device and a friction welding technology. The position control mode and force control mode interaction axial friction welding device is composed of a main shaft workpiece 10, a tail base workpiece 9, a main shaft system 11, a sliding table walking mechanism 8, a lathe bed 13, an axial loadingmechanism 5, a hydraulic oil source 6, a control system 1, a servo controller 2, a hydraulic servo valve 3, a pressure sensor 4, a pressure sensor 7 and a displacement sensor 12, and the axial friction welding function can be achieved. For the control requirements for welding force and displacement in the axial friction welding process, on the basis of the servo controller 2, the hydraulic servo valve 3, the pressure sensor 4, the pressure sensor 7, the displacement sensor 12 and the like, the force control mode and the position control mode are applied to the friction welding preparing process and the friction welding process, the precision of welding force loaded to welding workpieces and the relative position between the welding workpieces are greatly improved, and high-precision welding force and high-precision displacement control axial friction welding process is achieved.

Description

technical field [0001] The invention relates to an axial friction welding device and a friction welding process in which a position control mode and a force control mode interact. Background technique [0002] Axial friction welding is a kind of solid-phase welding device. It has the advantages of high-quality, high-efficiency, green and suitable for welding heterogeneous materials. It has a wide range of applications in aerospace, automobile, shipbuilding, petrochemical, engineering machinery and other fields. As a kind of heavy-duty equipment, the axial friction welding machine generally provides axial welding force by hydraulic drive. At present, the axial friction welding machine produced by the existing domestic equipment mainly uses the following three methods to supply oil to the axial loading mechanism of the upsetting : [0003] (1) Three-stage pressure reducing valve oil supply mode: The oil source of the hydraulic system supplies oil to the oil inlet of the three...

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Problems solved by technology

[0005] (3) Oil supply mode of hydraulic proportional valve: Compared with the oil supply mode of three-stage pressure reducing valve, the connection mode of hydraulic proportional valve and hydraulic oil source, upsetting welding cylinder and oil return of hydraulic system is the same, but in the oil pressure There is a difference in the way the adjustments are made and the resulting way the welding process is controlled

[0006] The friction welding machine produced based on the oil supply mode of the three-stage pressure reducing valve and the multi-way pressure regulating valve, when adjusting the pressure of the oil circuit or changing the action of the oil cylinder during the welding process, the reversing action of the valve core will make the oil circuit and the inner forging cylinder The oil pressure of the oil pressure fluctuates, causing large fluctuations in the welding force acting on the workpiece, which makes it difficult to accurately control the upsetting welding force during the friction welding process; the upsetting welding loading system based on hydraulic proportional valves , because the hydraulic proportional valve controls the hydraulic oil pressure, the displacement control of the upsetting welding cylinder during the welding process is realized through an external displacement sensor, and it is difficult to accurately control the displacement of the upsetting cylinder; due to the welding machine's own resistance and other factors As a result, the axial friction welding machine produced based on the above three methods is difficult to precisely control the force applied to the workpiece

In summary, the axial friction welding upsetting loading system constituted by the above method is difficult to achieve precise control of the workpiece axial force and welding deformation

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