Method for detecting surface defects of steel ball based on double-thread expansion method

Abstract

The invention relates to a method for detecting surface defects of a steel ball based on a double-thread expansion method. The method comprises a transmission mechanism, an expansion mechanism, a sorting mechanism and a detection system, wherein the feeding mechanism is connected with inlet ends of lead screws through a feeding pipeline, two ends of the lead screws are fixed on bearings, the leadscrews are driven to synchronously rotate by a stepping motor through a synchronous belt, threads with relatively large screw pitches are formed in the lead screws, the steel ball falls into a space between the threads of the two lead screws to form four contact surfaces with thread forms, the lead screws rotate to drive the steel ball to do a variable axis rotary motion, an expansion surface of the steel ball is changed according to the track of a helical line, five high-speed cameras are distributed above the lead screws and can be used for alternately capturing a to-be-detected surface of the expanded steel ball; and the tails of the lead screws are step-shaped, the detected steel ball falls into a receiving hopper through the step-shape tails, and an electromagnet is arranged in the front-back direction of the receiving hoper and is used for controlling a baffle to rotate around the shaft so that the steel balls fall into a storage box through a discharging pipe. According to the system described by the invention, the defects of the steel ball in a certain diameter range can be detected, and the system has relatively high detection efficiency.

Description

Technical field [0001] The invention relates to a steel ball surface defect detection system based on a double-thread unfolding method, in particular to a fast and efficient device for fully unfolding the steel ball surface, and controls the on and off of an electromagnet according to the information feedback from the detection of a high-speed camera to realize the defective steel ball Sorting. Background technique [0002] In the field of high-end steel balls, such as high-precision steel balls required by industries such as motor cars, aerospace, high-end automobiles, and high-precision CNC machining equipment, they are still monopolized by countries with advanced production technology and testing technology. Nowadays, some companies that process and produce steel balls have been able to manufacture high-end steel balls after continuous technological revolution and upgrade, but they are unable to participate in the competition in the high-end steel ball market due to the relati...

AI Technical Summary

Problems solved by technology

[0004] However, the technical inspection and equipment based on machine vision cannot detect all the parts above the axial plane at one time, and the effect of the edge area of ​​the steel ball is very poor. Only when the surface is unfolded as completely as possible can subsequent defect detection be carried out

Therefore, it is very necessary to expand the surface of the steel ball. The combination of the eddy current probe and the meridian expansion wheel is used for flaw detection of the steel ball, and the detection accuracy is high. The ball is tightly rubbed, which shortens its life and is expensive, resulting in higher application and maintenance costs in actual steel ball production

The output of steel balls is very large, but the existing technology mostly conducts the expansion and detection of steel balls one by one. This detection method is not only inefficient, but also affects the output of steel balls

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