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A wave type hydraulic loading method

A hydraulic loading, wave-type technology, applied in the pulsating hydroforming of metal slabs and open hollow parts, and in the field of pulsating hydroforming, it can solve the problems of difficult guarantee of pulsation parameters, high requirements for practical environment, and irregular hydraulic loading, etc. Simple and practical, low environmental requirements, easy to promote the effect

Inactive Publication Date: 2018-08-17
HEZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Japanese scholar Yogo developed a pulsating hydroforming system based on computer technology, but this system has the disadvantages of expensive equipment, complicated methods, inconvenient operation, and high requirements for practical environments, so it is difficult to promote
Domestic professor Yang Lianfa proposed a method for generating pulsating hydraulic pressure, which can realize simple pulsating hydraulic loading, but the hydraulic loading is irregular during the forming process, and it is difficult to guarantee the pulsating parameters (amplitude, period)

Method used

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  • A wave type hydraulic loading method
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  • A wave type hydraulic loading method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Figure 4(a), Figure 4(b) and Image 6 As shown, assemble the cylinder body 6, the wave wheel 13, the rack 14, the piston rod 8 with the rolling bearing 11 and other parts; put the booster piston 2 into the mouth of the cylinder body 6, when the sealing ring 7 completely enters the cylinder body 6 , keep the height; use the manual hydraulic pump to inject the liquid 4 into the cavity 5 of the device through the liquid inlet 20 on the booster valve 2, until the liquid level is equal to the working surface 18, stop adding liquid; figure 2 or image 3 The metal slab 3 shown is placed on the working surface 18 at the upper end of the booster piston 2 and positioned, and then the blankholder 1 is covered; the blankholder 1 presses the slab 3 under the action of an external force F, and simultaneously The blank holder 1 transmits the pressure to the booster piston 2, pushes the booster piston 2 down to squeeze the liquid in the cylinder 6 to obtain the high-pressure liquid 4...

Embodiment 2

[0029] Such as Figure 5 with Image 6 As shown, the cylinder body 6, the wave wheel 13, the rack 14, the piston rod 8 with the rolling bearing 11 and other parts are assembled; The piston 2 and the cylinder body 6 are fastened, and the two cannot move relative to each other at this time; adopt the same method as in Example 1, after all the gas in the cavity 5 is discharged, place it figure 2 or image 3 Cover the blank holder 1 with the slab 3 shown; connect the blank holder 1 and the booster piston 2 with a screw 9, and tighten the screw 9 with a digital torque wrench to obtain the required blank holder force; 16 is put into the center hole of the blank holder 1, with the help of external force F, the punch 16 goes down to draw the slab 3; at the same time, the manual hydraulic pump is used to continuously inject liquid 4 into the cavity 5 through the liquid inlet 20 , until the required hydraulic pressure value is obtained in the cavity 4; a certain pressure of the liqu...

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Abstract

The invention discloses a wave mode hydraulic loading method. According to the method, liquid is injected into a hydraulic cavity, through pressure of a press machine, the liquid in the hydraulic cavity is extruded by changing the distance between an upper die and a lower die, and the hydraulic pressure increasing gradually is obtained; in addition, the upper die drives a rack to move downwards when moving downwards, the rack is in engagement transmission with a gear and drives a wave wheel to do rotational motion, the rotating wave wheel makes a piston do reciprocating motion, and accordingly the pulse hydraulic pressure with alternate magnitudes is achieved; under the combined action of the hydraulic pressure increasing gradually and the pulse hydraulic pressure, a traditional rigid male die is replaced with the liquid, and plate pulse hydraulic forming can be achieved; and by replacing gears or wave wheels with different parameters and changing the downward-moving speed of the upper die, pulse hydraulic loading modes with different amplitudes and different periods can be achieved. The method has the advantages of being simple and convenient, low in cost, reliable in process, low in using environment requirement and the like.

Description

technical field [0001] The invention belongs to the field of mechanical engineering, and relates to a pulsating hydroforming method, in particular to a pulsating hydroforming method for metal slabs and open hollow parts. The materials include magnesium alloy, aluminum alloy, titanium alloy and other non-ferrous metals and other black Metal. Background technique [0002] In the fields of automobiles, aircraft, and aerospace, the research on "lightweight" technology of parts is a current research hotspot. How to manufacture parts with light weight, high strength and good quality in a simple and convenient way under the condition of ensuring low cost to meet the requirements of energy saving and environmental protection is an urgent key technology in this field. The plastic forming technology of metal sheet or pipe can obtain parts with light weight and high strength, but many high-quality metal materials have poor plasticity at room temperature, and the plastic forming limit ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D26/021B21D26/031
CPCB21D26/021B21D26/031
Inventor 毛献昌蒋礼林
Owner HEZHOU UNIV