On-line eddy current testing system for Combined drawing machine ECN8002

Project Overview

Customers produce drawing bars, mainly made of non-ferrous or ferrous metals. It is planned to install an on-line eddy current testing system on the combined drawing machine, and the OK/NG material will be sorted by the output signal after testing. The program will be proposed according to customer's product specifications and testing requirements. The actual design is different from the plan pictures, but the deviation is small. The design review drawings shall prevail.

1.1The material is non-ferrous metal, which can be detected by ordinary through probe.

1.2The material is ferromagnetic material. The uneven distribution of magnetic field in the material results in the instability of eddy current detection signal. The eddy current detection is based on magnetic saturation technology. After the detection, the demagnetization device is used to demagnetize (if necessary).

On the selection of installation position of on-line eddy current testing platform for combined drawing machine: because of the vibration of the position after shearing, it is impossible to install the testing platform, and the bar rotation in the two-roll position is not suitable for installation. Considering the factors of vibration and uniform speed, it is installed in the position of cross-straightening and vertical straightening before shearing.

The solution to the difficulty of correct sorting after shearing: through the signal of shearing machine, encoder and other signals, it can accurately identify the subsequent outflow bar (after shearing).

Other field requirements: the flaw detection system requires the puller to cut off the mechanism signal, the speed code signal can be output to the flaw detection system, in order to achieve accurate OK/NG sorting after cutting off. The number of photoelectric resolving elements (there is a clear gap between the continuously flowing rod and the rod) and the signal of clamping wheel can be used to separate the rod after cutting.

Ensure that the installation position is about 600mm in the axial direction before cutting off, the workpiece's jumping circumference is within ±0.1mm, the head of the bar should be introduced manually to avoid breaking the probe mechanism, and the tail should be cut off manually and pulled out after warping, so as to avoid damaging the probe.

Detecting Workpiece Information

Detection Objects Name                 Non-ferrous metal tubes, bars (non-ferrous metals such as aluminium and copper), ferrous metal bars, etc.

Material                                         Nonferrous metals, ferrous metals, etc.

Dimension                                      Specification: 8mm

Weld Width                                    /

Length                                           On-line flaw detection of length, flying saw cutting pipe or coil after flaw detection

Bending Degree                              1.5mm/m (Of the detection station)

Circular Degree                              Circular tube≦0.1mm

Roughness                                     Pipe wall and weld (with burrs)≦3.2, bar without protruding burr, etc.

Hardness                                        Harder

Detection Speed                             ≈60m/min (Instrument detection speed: 0.52-750m/min)

Detection Part Temperature            ≦80°C or normal temperature

Detection Requirement and Accuracy Standard

                                                               Executive Standard of Detection

Number of Standard                                         Name of Standard                                                             Grade

GB/T 14480-2015            Nondestructive Testing Instrument     Eddy Current Testing Equipment                    /

GB/T 11260-2008                          Eddy Current Testing Method for Round Steel                                          /

GB/T 29997-2013       Eddy Current Testing Method for Copper and Copper Alloy Bars and Wires                   /

Technical Parameter of the System

Name of the System: On-line eddy current testing system for Combined drawing machine (Cut off Precise Sorting Series)

Type: ECN8002

Detection Method: Dual Channel Through Type Detection (Absolute + Differential)

Control Mode: Automatic + Manual

Instrument and Probe: Eddy current instrument; Dual Channel Digital High Intelligence Eddy Current Flaw Detector and Probe

Detection Platform: Core detection platform independently developed

Brief Introduction of Detection Operation:

Adjust the technical parameters and standard samples of flaw detector according to the testing requirements;

Adjust the position of probe and probe according to workpiece specifications;

The flaw detection system detects the workpiece, alarms and marks;

Data recording, storage and analysis are carried out by the flaw detection host;

The OK/NG signal is output to the sorting system;

Automatically form flaw detection report;

The probe can be quickly replaced. The replacement time is less than 120S.

Important Parameters of the System

Name                                                 Technical Parameter                                   Remarks

End Blind Area                                           ≦50m                                     Depending on the test speed

Stability                                            After 72 hours≦2dB                                   Test sample

Accuracy of Jet Printing                              ±50mm                                            Test sample

Omissive Judgement Rate                              0%                                                Test sample

Misreporting Rate                                       ≦2%                                                Test sample

Accurate Sorting Rate                                100%                                                Test sample

Test Speed                      Instrument detection speed: 0.52-750m/min                    Test sample