How does machine vision appearance equipment detect component defects?

Date：2021-10-18 14:42:41Views：1192

Appearance detection is a detection equipment based on machine vision system. It can replace the traditional manual detection, realize the online high-speed automatic detection of product appearance and the automatic identification of product surface defects. Foreign machine vision inspection equipment is a kind of machine equipment developed and expanded in recent years, which can replace human eyes to inspect all relevant links of enterprise products.

First look at the components of machine vision inspection equipment system, which is mainly used for product surface defect detection.

1. Lens

Lens is like the existence of human eyeball. It is mainly responsible for beam modulation and data signal transmission in machine vision system. According to statistics, up to now, most lenses in the market can meet the market demand of machine vision applications, but more professional machine vision systems may need customized lenses and coatings. Fortunately, many lens manufacturers with internal production capacity are already ready to customize lenses to meet the needs of these application markets. Of course, these customized lenses will be very expensive, so they are usually only used in special imaging systems that are not sensitive to cost (such as military applications), or in the production line of mass production of consumer enterprise products.

2. Industrial camera

The most important practical function of industrial camera in machine vision system is to convert optical signal into electrical signal. Compared with ordinary cameras, it has higher transmission power, anti-interference power and constant imaging ability. There are various styles according to different specifications and sizes: according to the way of output data signal, it can be divided into analog industrial camera and digital industrial camera; According to different chip types, it can be divided into CCD industrial camera and CMOS industrial camera.

3. Image acquisition card

Although the image acquisition card is only a part of the integrated machine vision system, it plays a very important role and can directly affect the interface of the camera: black and white, color, analog, digital and so on. PCI acquisition card, 1394 acquisition card, VGA acquisition card and GigE gigabit network acquisition card are very common. These acquisition cards contain built-in multi-channel switches that can connect several cameras and capture multi-channel information at the same time.

4. Machine vision software

Machine vision software is the key component of automatic processing in machine vision system. Optical image screening machine can carry out secondary development of the software package according to the specific application market demand, and can fully automatically complete image acquisition, display, storage and processing.

What are the contents of appearance defect detection of electronic components? When detecting the appearance defects of electronic components, the following standards shall be implemented:

The model, specification, manufacturer and place of origin shall meet the design requirements, and the outer package shall be intact.

The appearance of electronic components shall be intact, and the surface shall be free of defects such as depression, scratch and crack; Components with external coating shall be free from falling off and scratch.

The electrode lead shall be free of crimping and bending, and the coating shall be intact and smooth without oxidation and corrosion.

The model and specification marks on the components shall be clear and complete, and the color code position and color shall meet the standards, especially the characters on the integrated circuit shall be carefully checked.

Components with mechanical mechanism are required to be qualified in size, flexible in thread and suitable in rotation feel; Switch components are flexible and feel good; The connector has proper tightness, good contact, etc.

Machine vision appearance inspection system mainly has three types of functions:

1. Positioning function

It can automatically determine the location of interested objects and products, and output the location information through a certain communication protocol. This function is mostly used for full-automatic assembly and production, such as automatic assembly, automatic welding, automatic packaging, automatic filling and automatic spraying, and cooperate with automatic actuators (manipulator, welding gun, nozzle, etc.);

2. Defect detection function

This is a function used by the vision system. It can detect the relevant information on the product surface, such as whether the packaging is correct, whether the packaging is correct, whether the printing is wrong, whether the surface is scratched or particle, damaged, whether there is oil stain, dust, whether the plastic parts are perforated, poor rain and fog injection molding, etc.

3. Classification detection function

After learning in the early stage, it can remember the characteristics of objects and products well, and then allocate them automatically according to the characteristics. This function is mostly used for full-automatic assembly and production, such as the classification of different defects of the same product on the production line; Diversion of different products in the same production line, etc.

Machine vision appearance inspection equipment is a key component in the field of intelligence. In the intellectualization of industrial manufacturing, how to detect with CCD inspection and CCD inspection equipment, and inspect different size data of products, such as size measurement, circle inspection, angle, curve inspection and range inspection, can not only obtain the size data of online products, but also judge and sort the appearance of products online in time, so as to eliminate defects, Widely used, the appearance of the product is different, and the optical performance must be different from the product itself. When the light source is incident on the appearance of the light product, different problems will be reflected in the aspects of reflection, refraction and so on.