Metal stamping parts refer to the use of external pressure to make the metal produce separation or plastic deformation, so as to obtain the workpiece. In the production process of stamping parts, there will inevitably be some bad problems, must be inspected, qualified before packing, delivery. The traditional manual detection method is slow, low precision, and prone to misdetection and missing detection problems. The use of machine vision inspection technology for metal stamping parts appearance defect detection is a better solution.

Common metal stamping parts appearance defect problem

The variety of metal stamping parts is rich, the shape is messy, in the stamping production, there are often some bad defects, common such as: Impurities, pressure damage, burrs, deformation, rust, oxidation, stains, scrapes, scratches, pits, bumps, defects, leakage, dandruff, cracking, offset, inconsistent size, poor shape, wrinkles, hole deviation, less holes, inconsistent aperture, broken printing, missing printing, engraving/printing is not clear, etc.

Traditional method of appearance defect detection

The traditional method of detecting the appearance defects of metal stamping parts is that workers judge whether there are any defects on the surface by looking at it with their eyes and touching it with their hands, and put the metal stamping parts on the gage for geometric size measurement. Without the gage, conventional tools are used, such as vernier calipers, gap ruler, steel plate ruler, box ruler, Angle meter, etc.

This detection method detection efficiency is relatively low, after all, people's energy is effective, in the repeated mechanized work will be easy to fatigue, unable to work for a long time. Moreover, the inspection standards of each worker cannot be completely consistent, which will also affect the detection results and accuracy.

Application of machine vision inspection technology in metal stamping parts appearance defect detection

Through machine vision inspection equipment to replace the human eye to measure the size of the product, surface defects, etc. When the product is photographed, the system will automatically identify the image features, analyze and calculate the feature information of the stamping workpiece, determine whether the product meets the requirements, and output the control signal. The testing process is fully automated, automatic feeding, automatic detection, automatic sorting, automatic cutting, reducing the input of labor costs.

Test case

Test product

Inspection requirements: Inspection of the appearance and size of the product, the appearance of the inner hole surface, the outer periphery of the upper half, the outer periphery of the upper half, the top hole surface, and the side hole surface.

Testing equipment

Non-standard customized pipeline visual inspection equipment

Equipment composition

Visual inspection software: SIPOTEK

Industrial computer: Custom made by SIPOTEK

Display: PHILIPS 22 "LCD display

Industrial camera: black and white camera

Camera module: customized by SIPOTEK

Industrial lenses: Custom lenses

Industrial light source: Custom light source

Detection platform: SIPOTEK customized framework

Control system: customized by SIPOTEK

Detection effect

Trachoma detection, underpouring detection, crack detection, bruise detection