A Method of NC Gradual Strengthening of Complicated Metal Surface

A metal surface, single-sided strengthening technology, applied in heat treatment process control, heat treatment equipment, manufacturing tools, etc., can solve the problems of high cost, low laser peening efficiency, poor strengthening uniformity, etc., to achieve overall performance and service behavior Improvement, Overall performance and service behavior optimization, and the effect of improving comprehensive service performance

Active Publication Date: 2021-01-26
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the techniques for realizing surface self-nanoization mainly include surface mechanical grinding, ultrasonic shot peening, laser peening, surface mechanical grinding, and plastic deformation by rotating roller pressure. Dust pollution and projectiles will introduce other elements on the workpiece, poor reinforcement uniformity in hard-to-strengthen positions such as corners, inconsistent shot peening passes and flat places; low efficiency and high cost of laser peening; surface mechanical grinding, rotary roll pressure plastic deformation, Only suitable for simple metal surfaces such as flat surfaces or surfaces of revolution

Method used

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  • A Method of NC Gradual Strengthening of Complicated Metal Surface
  • A Method of NC Gradual Strengthening of Complicated Metal Surface
  • A Method of NC Gradual Strengthening of Complicated Metal Surface

Examples

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Effect test

Embodiment 1

[0034] image 3 It is an aircraft skin part, the material is aluminum alloy AA2024, and its surface needs to be strengthened. in accordance with figure 2 The numerical control progressive strengthening process shown in the figure, the specific implementation steps of numerical control progressive strengthening are as follows:

[0035] (1) Select the CNC progressive strengthening method: the aircraft skin work area is mainly the outer surface, and the aluminum alloy AA2024 has low strength, so choose the CNC progressive single-sided grinding strengthening method, such as Figure 4 shown;

[0036] (2) Selection of numerical control progressive strengthening process parameters: Using the simulation method, firstly, under different combinations of process parameters, the numerical control progressive strengthening finite element simulation is carried out on the flat test piece to obtain data such as strain and strain rate. Then a material model based on dislocation density is ...

Embodiment 2

[0040] Figure 5 It is a schematic diagram of an aircraft engine blade, and the material is titanium alloy TC4. in accordance with figure 2 The numerical control progressive strengthening process shown in the figure, the specific implementation steps of numerical control progressive strengthening are as follows:

[0041] (1) Select the CNC progressive strengthening method: the working area of ​​the aircraft engine blade is close to the two outer surfaces, the titanium alloy TC4 has higher strength, the CNC progressive double-sided rolling strengthening method, the tool head is a ball, such as Image 6 shown;

[0042] (2) Selection of CNC progressive strengthening process parameters: Using the test method, firstly, the flat test piece is subjected to CNC progressive double-sided rolling strengthening under different combinations of process parameters. Then perform microscopic characterization, and select the combination of process parameters to realize the nanogradient stru...

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Abstract

The invention discloses a method for numerically controlled progressive strengthening of complex metal surfaces. Progressive strengthening method, shape size and material properties of metal parts, select appropriate numerical control progressive strengthening process parameters; carry out numerical control progressive strengthening: adjust the numerical control progressive strengthening process parameters based on the shape of metal parts, so that the process parameters adapt to the actual surface profile of metal parts ; Annealing of metal parts: stress relief annealing is carried out on the strengthened metal parts, the annealing parameters are determined by experiments, and the best combination of parameters to make the nanometer gradient structure stable is selected. The invention prepares a nano-gradient structure on the complex surface of the metal piece through the numerical control progressive strengthening of the complex metal surface, realizes the surface self-nanometerization, and improves the comprehensive service performance of the metal piece.

Description

technical field [0001] The invention relates to a numerically controlled progressive strengthening technology, which belongs to the field of metal surface strengthening, in particular to a method for numerically controlled progressive strengthening of complex metal surfaces. Background technique [0002] The instability of metal materials, such as corrosion, wear, fatigue and impact damage, mostly begins on its surface. By making the metal surface plastically deformed, a nanostructure surface layer of a certain thickness is prepared to realize surface self-nanometerization. properties such as wear resistance and fatigue life are of great significance. [0003] At present, the techniques for realizing surface self-nanoization mainly include surface mechanical grinding, ultrasonic shot peening, laser peening, surface mechanical grinding, and plastic deformation by rotating roller pressure. Dust pollution and projectiles will introduce other elements on the workpiece, poor rei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C21D10/00C21D11/00
CPCC21D8/00C21D10/00C21D11/00
Inventor 李小强宋旭韩凯许鹏彭星艺豆璐怡李东升
Owner BEIHANG UNIV
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