Zhongshan Q.R. Precision Steel Ball Co., Ltd. is professional manufacturer of high precision chrome steel balls and stainless steel balls. With years experiences, Q.R. has won considerable acclaim from home and abroad for the high precision and excellent quality of products.

As the critical parts, steel balls play a vital role in the precision, performance and working life of a bearing. Visual inspection is a common way in surface detection of steel balls. However, stability of steel ball quality can not achieve ideal result by visual inspection. More importantly, it’s harmful to health of human being, especially to their eyes. Moreover, it is hard to ensure accuracy and stability of inspection result. Steel ball surface testing machines has been put into t market for years.Three usual testing methods have been applied into these machines, namely optical, eddy-current and vibration sensor. The disadvantages of these machines are ball size limitation of eddy-current and precision limitation of vibration sensor. Quality of high precision and extreme miniature steel balls will be influenced through vibration sensor.

Through six years’ cooperation with national key laboratory on optical and image forming technology to solve the above problems, Steel Ball Surface Detector has been developed by Q.R. It is a practical machine for bulk inspection of steel ball diameter from 0.7938mm to 3.0mm with critical requirements on surface. Along with special designed assembly and roller installation, steel balls is ranked and rolled automatically. The image of steel balls are formed several times by camera in the setting frame frequency, which being inconfromity features would be sorted out automatically with the method of comparing with the preset qualified images by the detector. By highlighting steel ball surface defects, restraining influences from external environment and eliminating uncertain factors, undetected rates and misdetected rates are reduced by the detector significantly. Steel Ball Surface Detector is fit for miniature steel ball manufacturers who producing sizes from 0.7938mm to 3.0mm and having critical demand on steel ball surface.

Structure and Operating Principle Of the Steel Ball Surface Detector

The latest Steel Ball Surface Detector is the first one which could batch detect the steel balls surface under the size of 2mm in the world, obtained numbers of International and National patents,solved the problem that couldn’t batch detect the miniature steel balls surface.

Steel Ball Surface Detector contains two parts as function:

The first part: select the balls sizes precision by sorting roller,avoid mixing different size balls,control the variation of ball lot diameter effectively.

The second part: CCD Cameras detect the defect balls with Image Contrast Method, it takes the digital images automatically, choose one as the standard image,and when find the different images in operation,will pick out as unqualified one.

Technical Parameter:

Ball size available:0.7938mm~6.35mm(1/32”~1/4”);

Detection Speed: 14400pcs/hour;

Undetected Ration:0.0002%(manual control available);

Collecting Box:Two Boxes(Qualified/ Disqualified)

Operating Principle of Sorting Roller

The sorting roller use dry-type sorting method,it reuqires high cleanliness of the balls,it must be clean,free of oil and foreign matter.after the balls is ready,put the balls into the material plate,and the balls will move forward through the plastic tubing to the sorting roller.

Sorting roller is also our invention,obtained numbers of National patents,got the breakthroughs about the roller precision,roller motor setting and so on,the sorting precision is not larger than 0.003mm.

Operating Principle of CCD Camera

After selected by sorting roller,the qualified steel balls move into the second material plate,and then the balls will move ahead on the track which assembled with Linear vibrator and sensor,all above could ensure the normal operation.

When the balls move into the photosource, the CCD cameras takes the digital images automatically,the cameras scope has cover the most of the steel ball,it keeps moving and the camera keep photographing,so when the second time photographing is already cover the total steel balls,actually our CCD camera takes the photos five times,so it ensures the 100% percentage sorting,avoids the problem of undetected or nonuniform undetected ration.