Ultrasonic-extrusion reinforcement method and device for structural part connecting hole

A technology for strengthening devices and connecting holes, applied in the field of machining, can solve the problems of unable to change the vibration mode, unable to adapt to the requirements of hole strengthening, etc., to avoid the reaming process, eliminate wall scratches, and consume less energy. Effect

Active Publication Date: 2017-08-04
JIANGSU UNIV
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Problems solved by technology

This transducer is a pure torsional vibration, cannot change the vi

Method used

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  • Ultrasonic-extrusion reinforcement method and device for structural part connecting hole
  • Ultrasonic-extrusion reinforcement method and device for structural part connecting hole
  • Ultrasonic-extrusion reinforcement method and device for structural part connecting hole

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Embodiment Construction

[0058] Below in conjunction with accompanying drawing, this method is clearly described in further detail.

[0059] The present invention is an ultrasonic extrusion strengthening method for connecting holes 3 of structural parts. The method operates with a breath-type ultrasonic vibration mandrel 1 as an extrusion tool, and the vibration state of the breath-type ultrasonic vibration mandrel is as follows: figure 2 . The extrusion mandrel used is a cylindrical tool such as figure 1 , including a guide section 101, a front cone section 102, a working section 103, and a rear cone section 104.

[0060] The principle of the ultrasonic extrusion strengthening method of the present invention is as follows: figure 1 As shown, there is a connection hole 3 on the mother plate 2 of the structural part, and the axis of the mandrel 1 is aligned with the axis of the connection hole 3 under the condition that the mandrel 1 and the connection hole 3 maintain an extrusion margin of 2% to 6%...

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Abstract

The invention discloses an ultrasonic-extrusion reinforcement method and an ultrasonic-extrusion reinforcing device for a structural part connecting hole. According to the method, a core rod is used as an ultrasonic-extrusion reinforcing tool; the core rod uniformly passes through the connecting hole according to a speed of 10 mm/min to 60 mm/min at a condition that 2% to 6% of extrusion allowance is kept between the core rod and the connecting hole; meanwhile, the core rod is subjected to breathing type ultrasonic vibration of which the frequency is 15 kHz to 80 kHz and the alternating radial vibration amplitude is 3 to 50 microns; a pull-extrusion way is adopted during the overall process; the device comprises an ultrasonic wave generator, an ultrasonic vibrating part, a worktable, a guide cylinder, a hydraulic cylinder and a bracket, wherein the ultrasonic vibrating part is connected with a hydraulic rod by using a threaded sleeve; the hydraulic cylinder and the guide cylinder are separately installed at the two sides of a top plate of the bracket; and the worktable is installed on a base plate of the bracket. In the extrusion process, the extrusion allowance of the wall surface of the hole is increased, residual compressive stress is formed close to the wall of the hole, a radial residual compressive stress layer is deepened, lattice distortion is generated, dislocation density is increased, and axial plastic flowing of a material close to the wall surface of the hole is also reduced.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to an ultrasonic extrusion composite strengthening method and device for connecting holes of structural parts, which are mainly used for strengthening connecting holes of important structural parts in industries such as aviation, aerospace, trains and ships. Background technique [0002] At present, the main strengthening technologies for connecting holes of structural parts include cold extrusion strengthening technology, mechanical shot peening strengthening technology, interference fit connection technology, rolling strengthening technology and laser shock strengthening technology. Among them, cold extrusion and mechanical shot peening are two effective strengthening techniques that are widely used in the design of structural anti-fatigue fracture at home and abroad. [0003] The internal surface strengthening process of internal and external holes at ho...

Claims

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Application Information

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IPC IPC(8): C21D7/04C21D1/04
CPCC21D1/04C21D7/04
Inventor 姜银方刘委李鑫戚洪飞李旭姜文帆
Owner JIANGSU UNIV
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