CN103472131A - Apparatus for detecting axial residual stress of cold-drawn steel tube - Google Patents

Abstract

The invention discloses a cold-drawn steel pipe axial residual stress detection device, which belongs to the technical field of cold-drawn steel pipe stress detection. The invention includes an ultrasonic detection device and a roller device. The ultrasonic detection device includes a detection frame, a detection outer box is fixed on the detection frame, a spare detection liquid is installed in the lower part of the detection outer box, and a detection inner box is installed above the inner part of the detection outer box. The detection inner box is equipped with a detection liquid, and an ultrasonic probe and a water pump placed in the detection liquid are arranged in the detection inner box. The water pump is connected with the detection outer box through a pipeline, and the detection outer box is And the detection inner box is made with a through hole for the steel pipe to pass through; the roller device includes a plurality of frames, the frame is equipped with a support, the support is equipped with a roller and a motor that drives the roller to rotate, All rollers are at the same height. The invention can quickly and accurately measure the axial residual stress of the cold-drawn steel pipe, and improve the production qualified rate of the cold-drawn steel pipe.

Description

Cold-drawn steel pipe axial residual stress testing equipment

technical field

The invention relates to a device for detecting axial residual stress of a cold-drawn steel pipe, belonging to the technical field of stress detection of cold-drawn steel pipes.

Background technique

It has been decades since the production of high-precision cold-drawn tubes in my country started. From the perspective of the basic scale, not only can we produce cold-drawn tubes by ourselves, but we have also formed an annual production capacity of hundreds of thousands of meters. Ability, it should be said that this is not a small progress. However, there is still a lack of research on the influence mechanism of normal pressure and friction on the axial and circumferential residual stress of the product during the cold drawing process of the steel pipe, and the influence of the subsequent machining process on the distribution characteristics of the residual stress in the inner hole of the steel pipe. The final dimensional accuracy, shape accuracy and bearing capacity are not very clear, which directly affects the stability of the product. For example, in general, hot-rolled steel pipes can obtain about 30% elongation plastic deformation through cold drawing, so the tensile strength and hardness of cold-drawn steel pipes can be properly increased under the premise of maintaining a certain plasticity through reasonable arrangement of the process, so as to fully Give full play to the potential of steel and improve the utilization rate of materials. However, if the residual stress is not effectively controlled during the cold drawing process, the mechanical properties of the cold drawn tube will not only fail to increase, but will decrease instead. However, due to the elastic-plastic large deformation and contact nonlinear problems involved in the cold drawing process of steel pipes, and the subsequent processing also includes thermo-mechanical coupling fields, etc., even if some large-scale multi-physics analysis software is used for numerical simulation, when analyzing the residual stress There are also many difficulties. Compared with the numerical simulation research, the experimental research work is relatively backward. At present, except for the drawing force that can be measured in the laboratory, there is no related report on the experimental research work on the residual stress distribution. Although there are instruments for measuring the residual stress, it cannot be measured. Residual stress on the inner surface of the steel tube. Therefore, the production site urgently needs a device that can quickly and accurately measure the residual stress of cold-drawn steel pipes.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides an axial residual stress detection device for cold-drawn steel pipes, which can quickly and accurately measure the axial residual stress of cold-drawn steel pipes, and improve the production qualification rate of cold-drawn steel pipes.

The present invention is achieved through the following technical solutions: a cold-drawn steel pipe axial residual stress detection equipment, which includes an ultrasonic detection device and idler devices located on both sides of the ultrasonic detection device, the ultrasonic detection device includes a detection frame, and detects A detection outer box is fixed on the shelf, and the lower part of the detection outer box is equipped with a spare detection liquid. The upper part of the detection outer box is installed with a detection inner box, and the detection inner box is equipped with a detection liquid. The ultrasonic probe and the water pump in the liquid, the water pump is connected with the outer detection box through the pipeline, the outer detection box and the inner detection box are made with through holes for the steel pipe to pass through; the idler roller The device includes a plurality of frames, on which supports are mounted, idlers and motors that drive the idlers to rotate, and all the idlers are located at the same height.

The idler roller includes two oppositely arranged umbrella-shaped rollers, and a "V"-shaped bracket is formed between the two rollers. The rollers are installed on the axle, and the axle is rotatably installed on the support through the bearing. On the seat, a speed reducer is housed between the wheel shaft and the motor.

The beneficial effects of the present invention are:

1. Since the present invention uses a non-contact method to detect residual stress, it will not cause damage to the steel pipe.

2. The present invention can quickly and accurately detect the axial residual stress distribution of steel pipes, and improve the production pass rate of cold-drawn steel pipes.

3. The present invention is easy to operate and easy to implement.

Description of drawings

The present invention will be further described below according to the accompanying drawings and embodiments.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the left view of Fig. 1;

FIG. 3 is a top view of FIG. 1 .

In the figure, 1, motor, 2, reducer, 3, idler roller, 3-1, roller, 3-2, axle, 3-3, support, 4, frame, 5, anchor bolt, 6, Steel pipe to be tested, 7. Outer box for testing, 8. Water pump, 9. Ultrasonic probe, 10. Inner box for testing, 11. Testing frame.

Detailed ways

Below in conjunction with embodiment the present invention is further described.

A cold-drawn steel pipe axial residual stress testing equipment as shown in Figure 1, Figure 2, and Figure 3, it includes an ultrasonic testing device and roller devices located on both sides of the ultrasonic testing device, and the ultrasonic testing device includes a testing frame 11. The detection outer box 7 is fixed on the detection frame 11. The inner and lower parts of the detection outer box 7 are equipped with a spare detection liquid. The detection inner box 10 is installed above the inner part of the detection outer box 7. The lower part of the detection inner box 10 can be welded and fixed on the In the detection outer box 7, the detection inner box 10 is equipped with a detection liquid, and the detection inner box 10 is provided with an ultrasonic probe 9 and a water pump 8 placed in the detection liquid, and the water pump 8 is connected to the detection outer box through a pipeline. 7 are connected, and the detection outer box 7 and the detection inner box 10 are made with through holes for the steel pipe 6 to pass through; the roller device includes a plurality of frames 4, and the frame 4 is equipped with a 3-3, the supporting roller 3 and the motor 1 driving the rotating of the supporting roller 3 are housed on the support 3-3, and all the supporting rollers 3 are located at the same height.

The idler 3 includes two opposite umbrella-shaped rollers 3-1, a "V"-shaped bracket is formed between the two rollers 3-1, and the rollers 3-1 are installed on the axle 3-2 , the axle 3-2 is rotatably mounted on the support 3-3 through a bearing, and a speed reducer 2 is installed between the axle 3-2 and the motor 1 .

Example of the use of the present invention: After the inner diameter of No. 45 steel pipe with an outer diameter of 100 mm, an inner diameter of 80 mm, and a length of 5 m is expanded to 85 mm by cold drawing, in order to detect the distribution of axial residual stress of the steel pipe, the steel pipe is placed on the supporting roller of the present invention, and the steel pipe is started. The motor drives the roller to rotate and drives the steel pipe under test to move axially. The ultrasonic wave emitted by the ultrasonic probe is vertically injected into the steel pipe wall through the water medium, and is received by the ultrasonic probe after being reflected by the inner wall of the steel pipe. The nature and magnitude of the residual stress are judged according to the characteristics of the received reflected ultrasonic waves, such as amplitude and propagation velocity. After the inspection of one side of the steel pipe is completed, the steel pipe is rotated 180 degrees, the motor is reversed, and the steel pipe is driven to move back to detect the other side of the steel pipe.

Claims (2)

1. the axial unrelieved stress checkout equipment of cold drawing steel tube, it is characterized in that: it comprises ultrasonic detection device and is positioned at the support roller device of ultrasonic detection device both sides, described ultrasonic detection device comprises testing stand (11), be fixed with on testing stand (11) and detect outer container (7), detect the interior bottom of outer container (7) redundant detection liquid is housed, detect outer container (7) inner and upper case (10) in detection is installed, in case (10), tracer liquid is housed in detecting, be provided with ultrasonic probe (9) and the water pump (8) be placed in described tracer liquid in detecting in case (10), water pump (8) is connected with described detection outer container (7) by pipeline, be manufactured with the through hole passed for tested steel pipe (6) on case (10) in described detection outer container (7) and detection, described support roller device comprises a plurality of frames (4), and bearing (3-3) is housed on frame (4), carrying roller (3) is housed on bearing (3-3) and drives the motor (1) that carrying roller (3) rotates, and all carrying rollers (3) are positioned on sustained height.

2. the axial unrelieved stress checkout equipment of cold drawing steel tube according to claim 1, it is characterized in that: described carrying roller (3) comprises the running roller (3-1) of two umbrella shapes that are oppositely arranged, form the holder mouthful of " V " shape between two running rollers (3-1), running roller (3-1) is arranged on wheel shaft (3-2), wheel shaft (3-2) is arranged on described bearing (3-3) above by bearing is rotating, between wheel shaft (3-2) and described motor (1), reductor (2) is housed.

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