Axial ultrasonic vibration hydraulic bulging structure for tubular product

Abstract

The invention discloses an axial ultrasonic vibration hydraulic bulging structure for a tubular product. The axial ultrasonic vibration hydraulic bulging structure for the tubular product comprises anupper die base and a lower die base which are arranged in parallel up and down, wherein a first guide column and a second guide column are arranged between the upper die base and the lower die base;the upper die base is provided with a first guide sleeve and a second guide sleeve which are arranged on the first guide column and the second guide column in a sleeving manner correspondingly; the upper die base is provided with an amplitude-change pole penetrating the upper die base; an energy converter is arranged at the end of the upper end of the amplitude-change pole, and a shaft pressing head is arranged at the end of the lower end of the amplitude-change pole; and a liquid filling base, a distance ring and a positioning ring are sequentially arranged on the upper surface of the lower die base from bottom to top. The axial ultrasonic vibration hydraulic bulging structure for the tubular product is simple in structure, convenient to dismount and mount, easy to operate, high in tubular product forming efficiency and low in needed shaft pressure and hydraulic pressure, the bulging length of a tubular product can be adjusted, and bulging of a special-shaped section pipe fitting is achieved.

Description

technical field [0001] The invention relates to ultrasonic vibration assisted pipe hydroforming equipment, in particular to a pipe axial ultrasonic vibration hydraulic bulging structure. Background technique [0002] Ultrasonic vibration pipe hydroforming technology is based on the pipe hydroforming technology, using the high-frequency vibration of the ultrasonic vibration device to improve the forming environment of the pipe hydraulic bulging, and improve the new technology of pipe forming performance. At present, there are mainly two kinds of common pipe axial bulging structures, one is "external control liquid filling pressurized type", for example, Chinese patent ZL00208694.8 discloses an internal high pressure forming machine, and the special external liquid supply system is The pipe provides hydraulic pressure, and at the same time configures a press to apply axial pressure to the pipe, and realizes the axial bulge of the pipe by reasonably matching the hydraulic press...

AI Technical Summary

Problems solved by technology

At present, there are mainly two kinds of common pipe axial bulging structures, one is "external control liquid filling pressurized type", for example, Chinese patent ZL00208694.8 discloses an internal high pressure forming machine, and the special external liquid supply system is The pipe provides hydraulic pressure, and at the same time configures a press to apply axial pressure to the pipe, and realizes the axial bulge of the pipe by reasonably matching the hydraulic pressure and the axial displacement of the pressure head of the press. The axial pressure of the device promotes the expansion of the pipe. The material feeding in the forming area improves the forming performance of the pipe, but two independent systems are used to control the forming process of the pipe, the structure is complex, the operation is inconvenient, the cost is extremely high, and a fast replenishment speed is required, which increases the risk of wrinkles

The other is the "internal fluid replenishment pressurized type". For example, Chinese patent ZL200820104296.1 discloses a hydraulic bulging device for pipes, which squeezes the liquid in the pressurized rigid body through the booster piston without the need for an external liquid supply system. Provide the hydraulic pressure required for forming the pipe, and at the same time, the booster piston pushes the hollow pressure head located on the lower body of the booster cylinder to provide the axial force for the pipe. The structure of the device is simple, the liquid replenishment speed is fast, no external hydraulic supply system is required, the operation is convenient, and the manufacturing cost is low. However, during the forming process, due to the friction between the two ends of the pipe and the mold, the two ends of the bulging area of ​​the formed pipe will There is a difference in the axis

In order to change the friction state when the pipe is formed, American scholar Bauget has developed a set of ultrasonic vibration pipe hydroforming device. The mold connected with the ultrasonic vibration device on one side is placed in the bulging area of ​​the tube blank, and the shape is formed by the free bulging process. For hollow parts with special-shaped cross-section, the mold is fixed by the press during the bulging process, and the metal sealing head and the liquid filling head are used to drive the metal sealing head and the liquid filling head to seal and fill the pipe. During the forming process, it is found that the high-frequency ultrasonic vibration makes the mold and There is a high-frequency contact-separation state in the pipe, which changes the friction state of the forming, reduces the corner radius of the forming section by 7.7%, and improves the corner filling of the pipe, but the forming process requires pressure equipment and expensive transmission systems and supplies. Liquid system, the cost is high, and after the mold is fixed under the press, the ultrasonic vibration system is in a suspended state, and the vibration energy loss is serious. In addition, the ultrasonic vibration indirectly acts on the pipe through the mold, and the vibration energy cannot be applied to the pipe to the maximum extent.

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