阅读说明：本技术 滚动轴承支承辊辊颈过渡圆弧探伤检测方法 (Rolling bearing supporting roll neck transition arc flaw detection method ) 是由 关会彬 焦建 冯瑞 谷男男 于 2020-12-30 设计创作，主要内容包括：本发明公开了滚动轴承支承辊辊颈过渡圆弧探伤检测方法,属于轧辊的探伤领域,首先判断支承辊类型,将支承辊分为整体锻钢支承辊和镶套支承辊,然后整体锻钢支承辊用轴向穿透法或纵波斜探头检测法进行探伤检测,镶套支承辊用轴向穿透法进行探伤检测。本发明可以准确了解该部位是否存在缺陷,并以此可以去制定使用维护措施,最大限度发挥轧辊使用价值,提高钢厂的生产效率,降低在机断辊的恶性事故和异常辊耗。(The invention discloses a rolling bearing supporting roll neck transition circular arc flaw detection method, which belongs to the field of flaw detection of rolls. The invention can accurately know whether the part has defects or not, and can make use and maintenance measures according to the defects, thereby exerting the use value of the roller to the maximum extent, improving the production efficiency of a steel mill and reducing the malignant accidents and abnormal roller consumption of on-machine roller breakage.)

1. The detection method for the transition arc flaw detection of the roll neck of the rolling bearing roll is characterized by comprising the following steps: firstly, judging the type of the supporting roll, dividing the supporting roll into an integral forged steel supporting roll and an inlaid supporting roll, then carrying out flaw detection on the integral forged steel supporting roll by using an axial penetration method or a longitudinal wave angle probe detection method, and carrying out flaw detection on the inlaid supporting roll by using the axial penetration method.

2. The rolling bearing supporting roll neck transition arc flaw detection method according to claim 1, characterized in that: and flaw detection is carried out on the integral forged steel supporting roller by an axial penetration method, and the detection is verified by adopting a longitudinal wave oblique probe detection method after the detection.

3. The rolling bearing supporting roller neck transition arc flaw detection method of the claim 1 is characterized in that the longitudinal wave inclined probe detection method comprises the following steps:

step 1), placing an additional wedge block on the surface of a 2M straight probe at a roller body;

step 2) setting sound velocity and sound path;

step 3) scanning after setting the reference sensitivity and the scanning sensitivity;

and 4) using the end angle reflected wave as a reference wave, wherein abnormal waves occurring in a certain range before the wave can be cracks.

4. The rolling bearing supporting roll neck transition arc flaw detection method according to claim 3, characterized in that: in the step 2), the sound velocity is set to be 3230mm/s, the sound path meets the requirement that the lower end surface reflection echo is displayed on a horizontal time base line, and the sound path is set to be 1200-2000 mm; in the step 3), the wave height of the reflected echo is adjusted to 80% of the full screen as the reference sensitivity, and 6dB is added on the basis of the sensitivity to be used as the scanning sensitivity; and 3) scanning within the range of about 90-500mm from the end surface of the roller body, wherein the scanning speed is not more than 150 mm/s.

5. The rolling bearing supporting roll neck transition arc flaw detection method according to claim 3, characterized in that: the abnormal wave appeared in the range of 222-886mm away from the end surface of the roller body in the step 4) can be a crack.

6. The rolling bearing supporting roller neck transition arc flaw detection method of claim 1, characterized in that the axial penetration method comprises the following steps:

step a), a 2M straight probe is adopted to place the probe at a roller head 1/4R, and the roller is axially penetrated from the roller head end surface of the roller;

step b) adjusting the sound path and the sensitivity;

step c) determining a reference adjusting sound velocity and calibrating a flaw detector;

and d) judging that the roll neck has cracks when abnormal echoes appear at the sound path position of 1150-plus 1275 mm.

7. The rolling bearing supporting roll neck transition arc flaw detection method of claim 6, characterized in that: in the step b), the sound path is adjusted to be 4000-; and (3) regulating the sound velocity by taking the echo of the first reducing interface as a reference, namely calibrating the flaw detector at the position of the phi 570 reducing interface and 640mm away from the roller head, wherein each roller needs to be calibrated again.

Technical Field

The invention relates to the field of flaw detection of a roller, in particular to a roller neck transition arc flaw detection method.

Background

A supporting roll of a certain rolling line adopts a rolling bearing for reforming the rolling line, and because the roll neck is stressed and influenced by continuous widening of rolling line products after the roll body is lengthened at a fixed space between the memorial archways, the situation that the roll diameter transition arc part of the supporting roll is broken on the machine frequently occurs in use, so that the roll is scrapped, and the roll consumption is increased rapidly.

Through observing the cross-sectional shape of the roll diameter of the broken supporting roll, the expansion direction of the cracks at the arc part is basically vertical to the surface of the roll neck, and the propagation direction of the cracks is close to the expansion direction of the cracks when the surface of the roll neck is detected due to the fact that the transmitted waves of the straight probe or the twin probe are longitudinal waves, so that defects are not easy to detect. In addition, the probe can not directly detect the surface of the position due to the existence of the water retaining ring and the inner sleeve.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a rolling bearing supporting roll neck transition circular arc flaw detection method, which can accurately know whether the part has defects or not, and can make use and maintenance measures according to the defects, thereby exerting the use value of the roll to the maximum extent, improving the production efficiency of a steel mill, and reducing the malignant accidents and abnormal roll consumption of on-line roll breakage.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a method for detecting the transition arc of the roll neck of a rolling bearing roll includes judging the type of the roll neck, dividing the roll neck into an integral forged steel roll neck and an inlaid supporting roll neck, detecting the flaw of the integral forged steel roll neck by an axial penetration method or a longitudinal wave angle probe detection method, and detecting the flaw of the inlaid supporting roll neck by an axial penetration method.

The technical scheme of the invention is further improved as follows: and flaw detection is carried out on the integral forged steel supporting roller by an axial penetration method, and the detection is verified by adopting a longitudinal wave oblique probe detection method after the detection.

The technical scheme of the invention is further improved as follows: the longitudinal wave oblique probe detection method comprises the following steps:

step 1), placing an additional wedge block on the surface of a 2M straight probe at a roller body;

step 2) setting sound velocity and sound path;

step 3) scanning after setting the reference sensitivity and the scanning sensitivity;

and 4) using the end angle reflected wave as a reference wave, wherein abnormal waves occurring in a certain range before the wave can be cracks.

The technical scheme of the invention is further improved as follows: in the step 2), the sound velocity is set to be 3230mm/s, the sound path meets the requirement that the lower end surface reflection echo is displayed on a horizontal time base line, and the sound path is set to be 1200-2000 mm; in the step 3), the wave height of the reflected echo is adjusted to 80% of the full screen as the reference sensitivity, and 6dB is added on the basis of the sensitivity to be used as the scanning sensitivity; and 3) scanning within the range of about 90-500mm from the end surface of the roller body, wherein the scanning speed is not more than 150 mm/s.

The technical scheme of the invention is further improved as follows: the abnormal wave appeared in the range of 222-886mm away from the end surface of the roller body in the step 4) can be a crack.

The technical scheme of the invention is further improved as follows: the axial penetration method comprises the following steps:

step a), a 2M straight probe is adopted to place the probe at a roller head 1/4R, and the roller is axially penetrated from the roller head end surface of the roller;

step b) adjusting the sound path and the sensitivity;

step c) determining a reference adjusting sound velocity and calibrating a flaw detector;

and d) judging that the roll neck has cracks when abnormal echoes appear at the sound path position of 1150-plus 1275 mm.

The technical scheme of the invention is further improved as follows: in the step b), the sound path is adjusted to be 4000-; and (3) regulating the sound velocity by taking the echo of the first reducing interface as a reference, namely calibrating the flaw detector at the position of the phi 570 reducing interface and 640mm away from the roller head, wherein each roller needs to be calibrated again.

Due to the adoption of the technical scheme, the invention has the technical progress that:

the invention aims at the problems in the prior art, finds the flaw detection method of the transition arc part of the roll neck of the back-up roll of the rolling bearing, thereby accurately knowing whether the part has defects and information such as the size, distribution condition and the like of the defects and formulating the use and maintenance measures, furthest exerting the use value of the roll, reducing the downtime (time for processing the waste roll and the steel scrap) and the rejection rate of a rolling line, improving the production efficiency of a steel mill, improving the production efficiency of the steel mill and reducing the vicious accidents and abnormal roll consumption of the broken roll.

Meanwhile, the integral forged steel supporting roller can be subjected to flaw detection by an axial penetration method, and a longitudinal wave inclined probe detection method is adopted for detection verification after detection, so that the detection accuracy is further improved.

Drawings

FIG. 1 is a schematic view of a longitudinal wave tilt probe according to the present invention;

FIG. 2 is a schematic representation of the detection of the shaft penetration test of the present invention;

FIG. 3 is a normal site detection topography detection map in accordance with an embodiment of the present invention;

FIG. 4 is an anomaly detection profile in accordance with one embodiment of the present invention;

FIG. 5 is a diagram of detecting the topography of an abnormal portion according to a second embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following examples:

a detection method for detecting the transition circular arc of the roll neck of a rolling bearing roll includes judging the type of the roll neck, dividing the roll neck into an integral forged steel roll neck and an inlaid support roll, detecting the flaw of the integral forged steel roll neck by an axial penetration method or a longitudinal wave angle probe detection method, and detecting the flaw of the inlaid support roll neck by the axial penetration method.

The integral forged steel supporting roller can be subjected to flaw detection by an axial penetration method, and the detection is verified by a longitudinal wave oblique probe detection method after detection.

The longitudinal wave oblique probe detection method comprises the following steps:

step 1), placing an additional wedge block on the surface of a 2M straight probe at a roller body;

step 2) setting sound velocity and sound path; the sound velocity is set to be 3230mm/s, the sound path is required to meet the condition that the lower end surface reflection echo is displayed on a horizontal time base line, and the sound path is set to be 1200 and 2000 mm;

step 3) scanning after setting the reference sensitivity and the scanning sensitivity; adjusting the wave height of the reflected echo to 80% of the full screen as reference sensitivity, and increasing 6dB on the basis of the sensitivity as scanning sensitivity; scanning is carried out within the range of about 90-500mm from the end surface of the roller body, and the scanning speed is not more than 150 mm/s;

and 4) using the end angle reflected wave as a reference wave, wherein abnormal waves occurring in a certain range before the wave can be cracks. The range of calculation from the trigonometric function is typically 886mm from the roll body end face 222.

The axial penetration method comprises the following steps:

step a), a 2M straight probe is adopted to place the probe at a roller head 1/4R, and the roller is axially penetrated from the roller head end surface of the roller;

step b) adjusting the sound path and the sensitivity; adjusting the sound path to be 4000-5000mm, adjusting the sensitivity to enable echoes of each interface to be clearly visible, and setting the sensitivity to be 85-90 dB; regulating the sound velocity by taking the echo of the first reducing interface as a reference, namely calibrating the flaw detector at the position where the phi 570 reducing interface is 640mm away from the roller head, wherein each roller needs to be calibrated again;

step c) determining a reference adjusting sound velocity and calibrating a flaw detector;

and d) judging that the roll neck has cracks when abnormal echoes appear at the sound path position of 1150-plus 1275 mm.

Detailed description of the preferred embodiment

The roll neck of the on-site integral forged steel supporting roll is subjected to longitudinal wave inclined probe detection, the probe is placed on a roll body, the sound velocity is set to be 3230mm/s, and the sound path is set to be 1500 mm. The wave height of the reflected echo of the lower end surface is adjusted to 80% of the full screen as the reference sensitivity, 6dB is added on the basis of the sensitivity as the scanning sensitivity (90 dB), scanning is carried out in the range of about 90-500mm away from the end surface of the roller body, and the scanning speed should not exceed 150 mm/s. Abnormal reflection exists in the direction of 0-4 points of the roll neck at the end of the word, and the defect is generated at the position.

Detailed description of the invention

The method comprises the following steps of detecting the nested supporting roller by using a 2M straight probe, placing the probe at a roller head 1/4R, axially penetrating the roller from the roller head end to the roller, adjusting the sound path to be 5000mm, and adjusting the sensitivity to enable echoes of all interfaces to be clearly visible (the sensitivity is adjusted to be 90 dB); and (3) detecting by taking the echo of the first reducing interface (phi 570 reducing interface, 640mm away from the roller head) as a reference and adjusting the sound velocity (the sound velocity is 5920 mm/s), and finding that abnormal reflection exists at the position of 6-12 points of the non-character end. The water retaining ring is detached, and then the surface of the arc root is observed to be rough, wherein annular cracks which can be seen by naked eyes exist at the 6-12 point parts and small meat falling is accompanied, and the detection condition is consistent with the detection condition, which shows that the detection method is accurate and effective.

The cracks generated at the transition arc root of the roll neck of the supporting roll are influenced by the specifications of the rolling mill and the rolling line product, and the cracks are unavoidable and irreversible and cannot be eliminated in use. However, by the two detection methods, whether the part has defects or not and the distribution condition of the defects can be accurately known, the sizes of the defects can be judged through the wave height, and the use and maintenance measures are made, so that the use value of the roller is exerted to the maximum extent, and the purposes of reducing abnormal roller consumption and improving the production efficiency of a steel mill are achieved.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.