A method for detecting defects of a piston blank with a complex inner structure

A technology of internal structure and piston, which is applied in the field of defect detection of piston blanks with complex internal structures

Active Publication Date: 2019-04-05
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for detecting defects of piston blanks

Method used

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  • A method for detecting defects of a piston blank with a complex inner structure
  • A method for detecting defects of a piston blank with a complex inner structure
  • A method for detecting defects of a piston blank with a complex inner structure

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Embodiment Construction

[0106] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0107] Such as figure 1 As shown, a piston blank defect detection method with a complex internal structure includes the following steps:

[0108] Step 1. Manufacture a ladder-shaped perforated calibration test block consistent with the material of the tested piston blank, wherein the maximum height of the calibration test block step is greater than the maximum diameter of the tested piston blank;

[0109] The specific steps are: manufacture a calibration test block with n processing steps by means of mechanical processing, such as figure 2 As shown, flat-bottomed holes of (diameter / Ф, depth / h)=(1mm, 1mm), (2mm, 2mm), (3mm, 3mm)... are set on each step, n≥5; in this embodiment, The maximum diameter of the piston blank is 180mm, and the maximum height of the calibration test block ladder is 200mm. The ladder is divided into 5 steps, and the h...

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Abstract

The invention relates to a method for detecting defects of a piston blank with a complex inner structure. The method comprises the following steps of: forming a stepped punching calibration test blockwhich is consistent with the tested piston blank; Obtaining a DR image of the calibration test piece; Establishing a relation curve between different penetration thicknesses and the gray value mean value, the pore defect segmentation threshold value and the inclusion defect segmentation threshold value respectively; Establishing relation curves of different penetration thicknesses and different equivalents of cylindrical defect gray value extreme values; Detecting the defect-free standard sample piece of the tested piston blank from 0 degree to 90 degrees to obtain a first detection blind area image and a second detection blind area image; Calculating an inclusion type and pore type defect segmentation threshold map according to the defect-free piston blank; Calculating an inclusion defect image and an air hole defect image of the actually produced piston blank through the defect segmentation threshold graph; And calculating defect equivalents and quantification. According to the defect segmentation statistical distribution principle, the defect equivalents and quantification can be accurately and reliably detected.

Description

technical field [0001] The invention relates to the field of defect detection, in particular to a method for detecting defects of a piston blank with a complex internal structure. Background technique [0002] High power density diesel engine has the advantages of high speed and high combustion pressure, which is an inevitable trend in the development of vehicle power. At present, the extrusion casting technology is used to realize the reinforcement of the first ring groove aluminum matrix composite material and the formation of the internal cooling oil passage, which meets the requirements of high speed and high combustion pressure of high power density diesel engines on piston strength, wear resistance, heat resistance, and fatigue resistance. sexual demands. Due to factors such as numerous production processes, complex internal structure, and large volume, defects such as porosity, pores, and inclusions are prone to occur inside. Under the conditions of high mechanical l...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/136G06T7/187G01N21/95
CPCG06T7/0004G06T7/136G06T7/187G01N21/95G06T2207/30108G06T2207/10116
Inventor 齐子诚倪培君付康张维国郑颖左欣郭智敏唐盛明李红伟乔日东
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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