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Aluminum casting pore size evaluation method based on real-time imaging grade evaluation

A technology of real-time imaging and pore size, applied in measuring devices, instruments, scientific instruments, etc., can solve problems such as estimating the actual size of pores in aluminum castings, unfavorable engineering production operations, etc.

Pending Publication Date: 2021-04-23
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the existing technology, only 8 grades of air hole defects in magnesium-aluminum castings can be evaluated at 1 / 4 inch (6.35mm) and 3 / 4 inch (19.1mm) wall thickness through ASTM E155, and it is impossible to predict according to the grade evaluation results. Estimating the actual size of air holes in aluminum castings leads to problems that are not conducive to further production operations in actual projects. The present invention provides a method for evaluating the size of air holes in aluminum castings based on real-time imaging grade evaluation. Through artificial processing of air hole defects, the air hole diameter and Defect wall thickness of aluminum castings, according to ASTM E155, evaluate the real-time imaging level of the set air holes under each set wall thickness, and then establish a correlation curve between the actual size of the air holes and the real-time imaging level, and then realize the real-time imaging level evaluation on known parts. In the case of wall thickness, use real-time imaging equipment to quickly evaluate the internal porosity level of the casting according to ASTM E155, and estimate the actual size range of the internal porosity of the casting through the corresponding search correlation curve, which plays a positive role in the field of actual engineering production and quality inspection

Method used

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  • Aluminum casting pore size evaluation method based on real-time imaging grade evaluation
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  • Aluminum casting pore size evaluation method based on real-time imaging grade evaluation

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Embodiment 1

[0050] A method for evaluating the pore size of aluminum castings based on real-time imaging grade evaluation, comprising the following steps:

[0051] 1. Establish a correlation curve between the actual size of the stomata and the real-time imaging level:

[0052] 1. Artificially manufacture air holes on a 10mm thick aluminum plate, and the air hole sizes are 1mm, 1.5mm, 2mm, ..., 9mm respectively. According to ASTM E155, the real-time imaging grade evaluation of the air holes on the 10mm thick aluminum plate is carried out, and the corresponding evaluation level is fitted with the air hole size a curve.

[0053] 2. Add a layer of 10mm aluminum plate behind the 10mm thick aluminum plate, re-evaluate the real-time imaging grade of the pores of the 20mm thick aluminum plate according to ASTM E155, and fit a curve between the corresponding evaluation level and the pore size.

[0054] 3. Add a layer of 10mm aluminum plate behind the 20mm thick aluminum plate, re-evaluate the rea...

Embodiment 2

[0059] If the data sample is sufficient (covering all defect samples with a wall thickness of 10-40mm and a pore size of 1-9mm), it is possible to directly use industrial CT to measure the internal pores of the sample casting instead of using the method of artificially manufacturing pore defect samples. , get the actual size of the stomata, and carry out the real-time imaging rating evaluation, and establish the correlation curve between the actual size of the stomata and the real-time imaging grade.

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Abstract

The invention discloses an aluminum casting pore size evaluation method based on real-time imaging grade evaluation, which comprises the following steps of: manufacturing defect samples: selecting aluminum castings with different wall thicknesses, and respectively and manually manufacturing pores with different sizes in the aluminum castings with different wall thicknesses; respectively carrying out real-time imaging grade evaluation on the defect samples manufactured in the step 1 according to ASTM E155, and establishing a correlation curve between the actual size of the pores and the real-time imaging grade; and evaluating the pore sizes of the aluminum castings, namely evaluating the pore grades of the aluminum castings with the known part wall thicknesses through real-time imaging, and establishing a correlation curve table for comparing the grade evaluation result with the pore actual size established in the step 2 and the real-time imaging grade to obtain an evaluation result of the actual pore sizes of the aluminum castings.

Description

technical field [0001] The invention relates to a method for evaluating the pore size of an aluminum casting, in particular to a method for evaluating the pore size of an aluminum casting based on real-time imaging grade evaluation, and belongs to the technical field of casting defect detection. Background technique [0002] At present, most of the international real-time imaging grade evaluation standards will use ASTM E155-2015 Standard Reference Radiographs for Inspection of Aluminum and Magnesium Castings (radiographs for inspection of aluminum castings and magnesium castings) as the basis for grade evaluation. [0003] ASTM E155 provides reference negatives for pore defects in 1 / 4 inch (6.35mm) and 3 / 4 inch (19.1mm) wall thickness, each divided into 8 grades for evaluation, and the national standard for pore defects in wall thickness ≤ 13mm and wall thickness Reference negatives are provided between 13mm and 50mm. [0004] However, the grade evaluation of the porosity ...

Claims

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Application Information

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IPC IPC(8): G01N23/046
CPCG01N23/046Y02P90/30
Inventor 田少军崔伟高东宏杨冬王亚丽宋健高悦凯郭志超李庆伟
Owner CHINA FIRST AUTOMOBILE