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Method and system for predicting residual stress of aluminum alloy large component

A technology of aluminum alloy components and residual stress, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of inability to accurately predict residual stress, etc. Effect

Pending Publication Date: 2018-09-28
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcoming that the existing system cannot accurately predict the residual stress of complex changes, and propose a method for predicting the residual stress of aluminum alloy large-scale components, including:

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  • Method and system for predicting residual stress of aluminum alloy large component
  • Method and system for predicting residual stress of aluminum alloy large component
  • Method and system for predicting residual stress of aluminum alloy large component

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specific Embodiment approach 1

[0026] Specific Embodiment 1: The method for predicting the residual stress of aluminum alloy large-scale components according to this embodiment, such as figure 1 shown, including:

[0027] Step 1. Install a thermocouple in the aluminum alloy component, heat the aluminum alloy component to the solid solution temperature and keep it uniform, then quench it, and record the temperature change of the thermocouple; generate the temperature field of the aluminum alloy component according to the temperature change of the thermocouple change results.

[0028] The schematic diagram of setting thermocouples in aluminum alloy components is as follows figure 2 as shown, figure 2 The middle cube represents the aluminum alloy component sample. Thermocouples are inserted in different positions of the temperature measuring device, and the cooling curve during the quenching process can be drawn through the temperature measurement results of the thermocouples.

[0029] Step 2: applying th...

specific Embodiment approach 2

[0032] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is:

[0033] The stress evolution during quenching usually results from the uneven distribution of thermal strain caused by the uneven distribution of the transient temperature field in the aluminum alloy component during quenching. Prediction of quenching stress requires accurate calculation of temperature field. The accurate calculation of the component temperature field depends on the calculation of the heat transfer coefficient of the quenched surface. The calculation of the temperature field in the quenching process (step 1) is specifically:

[0034] Step one, such as figure 2 As shown, thermocouples are installed at multiple preset positions in the aluminum alloy components, and the thermocouples are connected to the data acquisition system. The aluminum alloy components are placed in the heating device and heated to the solid solution temperat...

specific Embodiment approach 3

[0047] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is: in step one and three, the convergence criterion is:

[0048]

[0049] In the formula, N is the number of test points; T i is the measured value of step i; T i ' is the calculated value of step i.

[0050] During the calculation, when f(x) is less than a preset value, it is considered to be convergent. For example, when f(x) is less than a minimum value (1×10 -6 ), the solution process is considered to be convergent, and the calculation ends.

[0051] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a method and a system for predicting a residual stress of an aluminum alloy large component, and belongs to the field of heat treatment and machining. The method and the system are pushed forward with an objective to solve the shortage that the existing system cannot accurately predict a complex changing residual stress. The method comprises the steps of arranging a thermocouple in the aluminum alloy component, heating the aluminum alloy component to a solution treatment temperature and keeping a temperature to be uniform, then performing quenching and recording a temperature change of the thermocouple; generating a temperature field change result of the aluminum alloy component according to a temperature change condition of the thermocouple; applying the temperature field change result to a stress field model of a quenching process to calculate to obtain a quenching residual stress result; importing the quenching residual stress result to a die-pressing mouldsimulation system to obtain a residual stress distribution after the die pressing; and performing residual stress and deformation prediction on the aluminum alloy component. The method and the systemare applied to a residual stress control and prediction system in a whole manufacturing process of the aluminum alloy large component.

Description

technical field [0001] The invention relates to a method and system for predicting the residual stress of large aluminum alloy components, belonging to the fields of heat treatment and mechanical processing. Background technique [0002] Aluminum alloys have excellent comprehensive properties and are widely used in the aerospace industry. In order to obtain high strength, solution quenching is an important heat treatment process for aluminum alloys. During the quenching process, a large residual stress will be introduced, which has a great impact on the dimensional stability, stress corrosion performance, and fatigue strength of components. Moreover, affected by the residual stress of the billet and the residual stress of machining, it is easy to produce a large processing deformation. Processing deformation is one of the most prominent problems faced by the manufacturing technology of aerospace structural parts. Controlling and predicting the residual stress in the aluminu...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/06
Inventor 姜建堂
Owner HARBIN INST OF TECH
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