Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 with complex internal structures that can be automatically detected and has high accuracy in view of the current state of the art

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com