CN101915804A - Nondestructive crack detection method for automobile torsion bar - Google Patents

Abstract

The invention relates to a nondestructive crack detection method for an automobile torsion bar, which comprises the following steps that: a headstock and a tailstock automatically pick up the automobile torsion bar, and the automobile torsion bar is installed on a right bracket and a left bracket through a feeding mechanism; the front end and the back end of the automobile torsion bar are in contact with main shafts on the headstock and the tailstock; a first probe, a second probe and a third probe of a point eddy current type are close to the surface of the automobile torsion bar to be tested; a motor drives the main shafts of the headstock and the tailstock to rotate, i.e. the motor drives the automobile torsion bar to rotate; the first probe makes a linear reciprocating motion under the action of a lead screw of the motor; and the first probe, the second probe and the third probe transmit data through a flaw detector, send signals to judge whether the torsion bar workpiece is qualified and perform automatic sorting. The invention has the advantage of detecting workpieces with complex shape and high requirements.

Description

The nondestructive crack detection method of automobile torsion bar

Technical field

The present invention relates to a kind of nondestructive crack detection method, relate in particular to a kind of nondestructive crack detection method of automobile torsion bar.

Background technology

Raw material metal through processing after, or metal material through the bakingout process rear surface and inside will be for cracking.

The means of detecting a flaw in the prior art have several different methods, as the laser flaw detection, and the flaw detection of X-ray line, magnetic powder inspection, eddy current test or the like, but all there is certain defective in above-mentioned method of detection.

Comparatively complicated as the laser flaw detection, and the expense costliness; Magnetic powder inspection produces magnetic field to measured workpiece, work under bad environment; Eddy current test only for passing form flaw detection, generally is that cylindrical work piece is detected a flaw at present, and is not obvious to the workpiece flaw detection effect of complicated shape comparatively.

As shown in Figure 1, the torsion bar product of automobile is with cylindrical identical, but need privileged site A is detected a flaw, because the surface of being detected a flaw can not be near the carrying out flaw detection gauge head, the form method of detection is passed in employing, flaw detection effect is undesirable, so the easy to operate practicality of a kind of use of demand, can reach the method for the flaw detection (nondestructive crack detection) of ideal effect again.

Summary of the invention

The technical issues that need to address of the present invention have provided a kind of nondestructive crack detection method of automobile torsion bar, are intended to solve the above problems.

In order to solve the problems of the technologies described above, the present invention realizes by following steps:

The headstock and tailstock pick up automobile torsion bar automatically, and automobile torsion bar is placed on right carriage and the left tray by cutting agency;

The front and back end of automobile torsion bar contacts with main shaft on the headstock and the tailstock;

First probe of vortex flow dot type, second probe and the 3rd probe are near tested automobile torsion bar surface;

Driven by motor frame main axis rotation end to end is the rotation of driving automobile torsion bar;

First probe does reciprocating linear motion under the effect of motor screw mandrel;

First probe, second probe and the 3rd probe be by the defectoscope Data transmission, sends signal and judge that the torsion bar workpiece is whether qualified and carry out automatic sorting.

Compared with prior art, the invention has the beneficial effects as follows: all can detect complex-shaped workpiece of having relatively high expectations.

Description of drawings

Fig. 1 is that the need of automobile torsion bar are surveyed the surface structure synoptic diagram.

Fig. 2 is the vortex flow dot type flaw detection mechanical device structure synoptic diagram that adopts among the present invention.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

As shown in Figure 2: the present invention realizes by following steps:

The headstock 3 and tailstock 2 pick up automobile torsion bar 1 automatically, and automobile torsion bar 1 is placed on right carriage 7 and the left tray 8 by cutting agency;

The front and back end of automobile torsion bar 1 contacts with main shaft on the headstock 3 and the tailstock 2;

First probe, 4, second probe the 5 and the 3rd probe 6 of vortex flow dot type is near tested automobile torsion bar surface;

Driven by motor frame main axis rotation end to end is 1 rotation of driving automobile torsion bar;

First probe 4 does reciprocating linear motion under the effect of motor screw mandrel;

First probe, 4, second probe the 5 and the 3rd probe 6 is by the defectoscope Data transmission, sends signal and judges that the torsion bar workpiece is whether qualified and carry out automatic sorting.

The principle of the prior art vortex flow dot type probe device that adopts among the present invention is: when surperficial defectiveness torsion bar product in pick-up unit rotation and moving process, after testing during the coil of contact current excitation, then the eddy current that induces of surface of the work layer can distort, this variation changes the impedance of coil, thereby in magnetic test coil, produce electric signal, can obtain producing image or drive sound equipment through signal Processing, the flaw indication of display device such as light record can be judged defective from the amplitude and the phase place of this signal.

Point type eddy current gauge head is placed in the detection position, surface of measured workpiece among the present invention, because gauge head and measured workpiece surface distance are approaching, so the high effect of accuracy of detection is obvious, adopts the some contact form therefore all can detect complex-shaped workpiece in addition.

Claims (1)

1. the nondestructive crack detection method of an automobile torsion bar, realize by following steps:

The headstock and tailstock pick up automobile torsion bar automatically, and automobile torsion bar is placed on right carriage and the left tray by cutting agency;

The front and back end of automobile torsion bar contacts with main shaft on the headstock and the tailstock;

First probe of vortex flow dot type, second probe and the 3rd probe are near tested automobile torsion bar surface;

Driven by motor frame main axis rotation end to end is the rotation of driving automobile torsion bar;

First probe does reciprocating linear motion under the effect of motor screw mandrel;

First probe, second probe and the 3rd probe be by the defectoscope Data transmission, sends signal and judge that the torsion bar workpiece is whether qualified and carry out automatic sorting.

Images