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A small hole inner wall strengthening device and method

A technology for strengthening devices and inner walls of holes, which is applied in vacuum evaporation plating, coating, melt spraying, etc., can solve the problems of low strengthening efficiency, complicated strengthening system, and difficulty in large-scale industrial application, and achieve uniform distribution, Increased reinforcement efficiency and wide application range

Active Publication Date: 2019-06-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to the complexity of the entire strengthening system, the strengthening efficiency is very low, and it is difficult to realize large-scale industrial application

Method used

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  • A small hole inner wall strengthening device and method
  • A small hole inner wall strengthening device and method
  • A small hole inner wall strengthening device and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as Figure 1 to Figure 8 As shown, a small hole inner wall strengthening device of the present invention mainly includes a metal load 1, a first electrode 2, a second electrode 3 and a metal vaporization circuit. Among them, the metal load 1 is penetrated in the hole of the part with holes 11, the first electrode 2 and the second electrode 3 are respectively clamped and connected to the two ends of the metal load 1, and the metal vaporization circuit is connected with the first electrode 2 and the second electrode. 3-phase connection. The metal vaporization circuit, the first electrode 2, the second electrode 3 and the metal load 1 together form a circuit loop. The metal vaporization circuit specifically includes a transformer 4 , a pulse capacitor 5 , a resistor 6 , an inductor 7 and a high voltage discharge switch 8 . The power supply input together with the transformer 4 and the pulse capacitor 5 form a charging circuit. The primary coil L1 of the transformer...

Embodiment 2

[0049] Such as Figure 9 As shown, a small hole inner wall strengthening device of the present invention, the main structure of the device is the same as that of embodiment 1, except that an elastic sleeve 10 is sleeved on the metal load 1 corresponding to the inner wall of the hole, and the metal load 1 The exterior is not coated.

[0050] When the small hole inner wall strengthening device is used, the high-voltage discharge switch 8 is disconnected first, and the voltage is boosted through the transformer 4 to charge the pulse capacitor 5. When the charging voltage of the pulse capacitor 5 reaches the set value, the charging circuit stops working; The discharge switch 8 is closed, and the pulse capacitor 5 is discharged to vaporize the metal load 1. The gas pressure generated after the gasification of the metal load 1 drives the elastic sleeve 10 to elastically expand, and the gas pressure is evenly applied to the inner wall of the hole, forming a A uniform residual compre...

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Abstract

The invention discloses a small hole inner wall strengthening device and method. The small hole inner wall strengthening device comprises a metal load (1), a first electrode (2), a second electrode (3) and a metal gasifying circuit. The metal load (1) is arranged through a hole of a part (11) with the hole; the first electrode (2) and the second electrode (3) are separately connected to two ends of the metal load (1); the metal gasifying circuit is connected to the first electrode (2) and the second electrode (3); the metal gasifying circuit, the first electrode (2), the second electrode (3) and the metal load (1) form a circuit loop; and the metal load (1) is gasified when the metal gasifying circuit discharges. The small hole inner wall strengthening device is good in strengthening effect, simple in structure and small in energy of required equipment.

Description

technical field [0001] The invention relates to the technical field of material surface strengthening and material processing, in particular to a small hole inner wall strengthening device and method. Background technique [0002] Fasteners are typical stress concentration details on aircraft components, which are prone to fatigue cracks under the action of alternating loads, which will greatly reduce the safety, reliability and service life of the whole machine. In engineering practice, surface strengthening treatment is usually carried out on the fastening holes to improve the life of the aircraft. Fastening hole strengthening technologies mainly include: cold extrusion, rolling and mechanical shot peening. The mechanism of these strengthening methods is to generate a residual compressive stress layer on the surface of the hole to reduce the average stress of the local fatigue dangerous point bearing the load. Among them, cold extrusion technology is a relatively mature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/09C23C14/32
CPCC21D1/09C23C4/12C23C14/26
Inventor 崔晓辉张志武喻海良王青山
Owner CENT SOUTH UNIV
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