Pulse hydraulic device and method of producing pulse hydraulic pressure by using pulse hydraulic device

Abstract

The invention discloses a pulse hydraulic device which comprises a base, a hydraulic cavity body, a piston rod and an amplitude modulation mechanism; an oil inlet channel and an oil outlet channel that are formed horizontally are formed in an inner cavity of the hydraulic cavity body; a junction between the oil inlet channel and the oil outlet channel communicates with a perpendicularly arranged piston slideway; the piston rod is arranged at the upper part of the hydraulic cavity body; the lower end of the piston rod is slidingly matched with the piston slideway; the upper end of the piston rod is in transmission connection with the amplitude modulation mechanism; the amplitude modulation mechanism is in transmission connection with a motor I; and the motor I is electrically connected with a controller. A method of producing pulse hydraulic pressure by using the pulse hydraulic device comprises the following steps: S1 the pulse hydraulic device is mounted; S2, exhausting and oil charging are carried out; S3, a pulse loading curve is drawn; and S4, operation is started formally. The pulse hydraulic device is simple in structure, wide in application range and low in running cost. The method of producing the pulse hydraulic pressure is scientific and is simple to operate, by changing the frequency and amplitude of the amplitude modulation mechanism, the pulse hydraulic pressure at corresponding frequency and amplitude can be output, the requirements of a hydraulic section mould are met, and a result is precise and reliable.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to a hydraulic device and method for processing plates or pipes, in particular to a pulsating hydraulic device and a method for generating pulsating hydraulic pressure with it. Background technique [0002] Hydroforming technology is an advanced manufacturing technology. The forming principle is to apply internal pressure inside the part to be formed to make it plastically deform in a given cavity and fit with the inner surface of the mold until the required shape of the sheet or pipe is obtained. Parts; Compared with conventional processing technology, it has the advantages of less raw materials, processing times and the number of molds required, high dimensional accuracy of parts, short production cycle, and low cost. Therefore, it is widely used in the machining industry, especially in the automobile manufacturing industry. be widely used. [0003] The loading path g...

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Problems solved by technology

[0004] 1. In the production of large heterogeneous structural parts, due to the complex shape of the forming, the contact area between the part to be formed and the mold increases to generate greater friction, which makes it difficult to feed the material during the forming process, and it is easy to cause the wall thickness of the part to be formed to be excessively thinned and rupture ;

[0005] 2. The molding performance is relatively poor, which seriously affects the forming performance of pipes (plates are also OK), and the required forming pressure is high;

[0007] In order to overcome the above defects, the industry has proposed the hydroforming method of pulsating loading, that is, in the internal high pressure forming, the hydraulic pressure P changes according to a certain frequency and amplitude, so that the workpiece to be formed is finally formed. This loading method is similar to the reduction of the friction coefficient. It can delay the generation of wrinkling and cracking, effectively avoid local thinning of the material, and the forming result is more uniform, which can significantly improve the forming performance of the material; pulsating loading needs to generate pulsating hydraulic pressure. At present, numerical control systems are mostly used. Pulsating hydraulic pressure, the problem is that the forming is complicated, and the cost of the numerical control system is very high

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