Method for detecting forge piece through ultrasonic C scanning

Abstract

The invention relates to a method for detecting a forge piece by using ultrasonic C-scanning, which comprises the following steps of: 1, placing the forge piece at a detection position of an ultrasonic C-scanning detection system, and enabling the center of the forge piece to coincide with the origin of coordinates of the system; 2, the probe is moved, the probe is made to deviate from the center line of a virtual square, the probe is made to be perpendicular to the outer circumferential face of the forged piece, and the virtual square is a graph formed by splicing a stroke boundary line of the probe moving along the X axis and a stroke boundary line of the probe moving along the Y axis; 3, the distance between the probe and the outer circumferential face of the forge piece is adjusted, the probe is driven to emit ultrasonic waves, and sound beams emitted by the probe are focused on the outer circumferential face of the forge piece; and step 4, moving the probe along the Z axis until the probe scans the forge piece to complete detection. By means of the method, the forge piece with the larger outer diameter can be detected through an existing ultrasonic C scanning detection system, and the detection capacity is higher.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic detection, and in particular relates to a method for detecting forgings by utilizing ultrasonic C scanning. Background Art

[0002] Ultrasonic C-scan testing is a non-destructive testing technology based on the principle of ultrasonic reflection. It generates a visual image of the internal defects of the workpiece through two-dimensional plane scanning. It is widely used in the fields of material defect analysis, industrial quality control, etc. With the development of science and technology, the current ultrasonic C-scan testing system is becoming more and more advanced, and the testing method is becoming more and more accurate and simple. Specifically, the system has its own coordinate origin. The farthest boundary of the probe 2 moving along the X-axis and the farthest boundary of the probe 2 moving along the Y-axis can be spliced ​​to form a virtual square (such as Figure 1 The system probe 2 can only move within the virtual square and cannot go beyond the virtual square. When used to detect a disc-shaped forging 1, the specific method is as follows:

[0003] First, place the forging 1 at the testing position so that the center of the forging 1 is at the coordinate origin of the system (that is, the X coordinate and Y coordinate of the center of the forging 1 are both 0). At this time, the probe 2 is located on a midline of the above virtual square (such as Figure 1 ), it should be noted that the center line is parallel to the X-axis; then the probe 2 is driven to move along the X-axis toward the side away from the forging 1, thereby adjusting the distance between the probe 2 and the outer circumferential surface of the forging 1 (this distance can be called the water distance) so that the focus of the sound beam emitted by the probe 2 is exactly located on the outer circumferential surface of the forging 1; then the probe 2 is driven to move along the negative direction of the Z-axis until the probe 2 detects the boundary position of one end of the forging 1; finally, the probe 2 is driven to move along the positive direction of the Z-axis until the probe 2 detects the boundary position of the other end of the forging 1, thereby completing the detection.

[0004] like Figure 1 As shown, due to the limitation of the probe 2 movement range of the system, the probe 2 can only move within the above-mentioned virtual square. At present, the side length of the above-mentioned virtual square is S+2L, where S=1500mm, L is the above-mentioned water distance value, usually L=150mm. In this way, the maximum outer diameter of the forging 1 that can be detected by the current system is 1500mm. Of course, if the outer diameter of the forging 1 is less than 1500mm, the system can be applied. However, when the outer diameter of the forging 1 is greater than 1500mm, the system is no longer applicable.

[0005] Therefore, a method based on the current ultrasonic C-scan detection system and applicable to detecting forgings 1 with an outer diameter greater than 1500 mm is in urgent need of emergence. Summary of the Invention

[0006] The present invention provides a method for detecting forgings by using ultrasonic C-scanning, which is used to solve the technical problem that the current method for detecting forgings by using ultrasonic C-scanning cannot be applied to detecting forgings with a diameter greater than 1500 mm.

[0007] The present invention is achieved through the following technical solution: a method for detecting forgings using ultrasonic C scanning, comprising:

[0008] Step 1: Place the forging at the detection position of the ultrasonic C-scan detection system so that the center of the forging coincides with the coordinate origin of the system;

[0009] Step 2: Move the probe so that it deviates from the center line of the virtual square and is perpendicular to the outer circumferential surface of the forging. The virtual square is a figure formed by the boundary line of the probe's movement along the X-axis and the boundary line of its movement along the Y-axis.

[0010] Step 3: adjusting the distance between the probe and the outer circumferential surface of the forging, and driving the probe to emit ultrasonic waves so that the sound beam emitted by the probe is focused on the outer circumferential surface of the forging;

[0011] Step 4: Move the probe along the Z axis until the probe scans the forging and completes the inspection.

[0012] Furthermore, in order to better implement the present invention, in step 2, the probe is moved as follows:

[0013] Step 2.1: Position the probe at the center line of the virtual square along the X-axis;

[0014] Step 2.2: Move the probe along the Y axis until the probe moves to point A, and obtain the coordinates of point A as (a, b) through system readings;

[0015] Step 2.3: Rotate the probe in the XY plane at an angle of β, where tanβ=b / a, so that the probe is perpendicular to the outer circumferential surface of the forging at point A.

[0016] Furthermore, in order to better implement the present invention, the step 2.1 includes:

[0017] Step 2.11: placing the probe above the forging, and adjusting the probe so that the probe is perpendicular to the upper end surface of the forging;

[0018] Step 2.12: Rotate the probe in the XZ plane by 90° so that the probe is located at the center line of the virtual square along the X axis.

[0019] Furthermore, in order to better implement the present invention, in step 2.2, the X coordinate of point A to which the probe moves is equal to the Y coordinate.

[0020] Furthermore, in order to better implement the present invention, in step 3, the method for adjusting the probe is:

[0021] The probe is moved synchronously and at the same speed along the X-axis and the Y-axis.

[0022] Furthermore, in order to better implement the present invention, step 4 includes:

[0023] Step 4.1: Move the probe along the negative direction of the Z axis until the probe detects the lower end surface of the forging;

[0024] Step 4.2: Move the probe along the positive direction of the Z axis until the probe detects the upper end surface of the forging, completing the inspection.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In the ultrasonic C-scanning method for inspecting forgings provided by the present invention, the probe is positioned offset from the centerline of a virtual square during the forging scan, and the probe is perpendicular to the outer circumference of the forging. The virtual square represents the intersection of the probe's travel boundary along the X-axis and the probe's travel boundary along the Y-axis. Compared to the prior art, the probe in the method provided by the present invention is not positioned at the centerline of the virtual square along the X-axis during inspection, allowing the probe to move farther away from the center of the forging. Therefore, the method provided by the present invention is applicable to inspecting disc-shaped forgings with diameters greater than 1500 mm, extending its applicability to a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a diagram showing the relationship between the probe and the forging position when using ultrasonic C-scan to inspect forgings using the existing method (top view);

[0029] Figure 2 It is a structural diagram of the forging;

[0030] Figure 3 2. This is a diagram showing the positional relationship between the probe and the forging after step 2.11 of the method provided in an embodiment of the present invention is implemented (front view);

[0031] Figure 4 is a diagram showing the positional relationship between the probe and the forging after step 2.12 of the method provided in an embodiment of the present invention is implemented (front view);

[0032] Figure 5 is a diagram showing the positional relationship between the probe and the forging after step 2.12 of the method provided in an embodiment of the present invention is implemented (top view);

[0033] Figure 6 2. FIG. 1 is a diagram showing the positional relationship between the probe and the forging after step 2.2 of the method provided in an embodiment of the present invention is implemented (top view);

[0034] Figure 7 2.3 is a diagram showing the positional relationship between the probe and the forging after the implementation of step 2.3 of the method provided in an embodiment of the present invention (top view);

[0035] Figure 8 is a diagram showing the positional relationship between the probe and the forging after step 3 of the method provided in an embodiment of the present invention is implemented (top view);

[0036] In the picture:

[0037] 1-Forging, 2-Probe. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0039] Example:

[0040] This embodiment provides a method for detecting a forging 1 using ultrasonic C-scanning. The method is based on an existing ultrasonic C-scanning detection system and improves the existing detection method, thereby being more suitable for detecting a forging 1 with a larger diameter (e.g., a disk or annular shape). Figure 2 It should be noted that, as described in the background art, in the existing detection method, the probe 2 configured by the detection system is located on the center line of the virtual square along the X axis, as shown in FIG. Figure 1 As shown, the existing method can be applied to detect forgings 1 with a maximum diameter of 1500 mm. In fact, the maximum travel of the probe 2 of the current ultrasonic C-scan detection system along the X-axis and Y-axis is M = 1800 mm, that is, 1500 mm + 2 × 150 mm. The above 1500 mm is Figure 1 The S in the figure is 150mm. Figure 1The L in the figure (i.e., the water distance of the probe 2) is still applicable to forgings 1 with a diameter less than 1500 mm using the existing system and detection method. However, forgings 1 with a diameter greater than 1500 mm cannot be detected using the existing system and detection method.

[0041] The method provided in this embodiment includes the following steps:

[0042] Step 1: Place the forging 1 at the detection position of the ultrasonic C-scan detection system so that the center of the forging 1 coincides with the coordinate origin of the system. It should be noted that the above-mentioned ultrasonic C-scan detection system is prior art and will not be described in detail here.

[0043] Step 2: Move the probe 2 so that it deviates from the center line of the virtual square along the X-axis and makes the probe 2 perpendicular to the outer circumference of the forging 1. The virtual square is a figure formed by splicing the boundary line of the travel of the probe 2 along the X-axis and the boundary line of the travel along the Y-axis. From the knowledge of geometry, we know that the length of the center line of the two opposite sides of the square is equal to the side length of the square, and the longest line segment in the square is the diagonal of the square. In between, as long as the length of the line connecting the two points that deviate from the midpoint of the opposite sides is between the length of the side and the length of the diagonal. Therefore, when the probe 2 is deviated from the center line of the virtual square and the probe 2 is perpendicular to the outer circumference of the forging 1, the range of movement of the probe 2 is greater than the range of movement when the probe 2 is at the center line of the virtual square. In addition, it is worth noting that making the probe 2 perpendicular to the outer circumference of the forging 1 means that the sound beam emitted by the probe 2 is perpendicular to the outer circumference of the forging 1.

[0044] Step 3: Adjust the distance between probe 2 and the outer circumference of forging 1 and drive probe 2 to emit ultrasonic waves so that the sound beam (i.e., ultrasonic waves) emitted by probe 2 is focused on the outer circumference of forging 1. The purpose of this step is to focus the sound beam emitted by probe 2 on the outer circumference of forging 1, that is, to adjust the water distance so that the distance between probe 2 and the outer circumference of forging 1 is 150 mm.

[0045] Step 4: Move the probe 2 along the Z axis until the probe 2 scans the forging 1 and the inspection is completed. Through this step, the forging 1 is completely inspected using the ultrasonic waves emitted by the probe 2.

[0046] In the above manner, in this method, the position of the probe 2 during detection is located away from the center line of the virtual square along the X-axis, so the range of movement of the probe 2 is greater than its stroke on the X-axis / Y-axis, that is, the range of movement of the probe 2 is greater than 1800 mm. For example, the range of movement of the probe 2 is 1900 mm, minus the water distance of 2×150 mm on both sides. Then, the maximum outer diameter of the forging 1 that the probe 2 can be applied to detect can reach 1900-300=1600 mm, which is greater than 1500 mm of the existing method. Therefore, the method provided in this embodiment can be applied to detecting disc-shaped forgings 1 with a diameter greater than 1500 mm, and has a wider range of applicability.

[0047] An optional implementation of this embodiment is as follows: In the above step 2, the moving method of the probe 2 is:

[0048] Step 2.1: Position the probe 2 at the center line of the virtual square along the X-axis, with the probe 2 perpendicular to the outer circumference of the forging 1. This step actually includes:

[0049] Step 2.11: Place the probe 2 above the forging 1 and adjust the probe 2 so that it is perpendicular to the upper end surface of the forging 1. Figure 3 shown.

[0050] Step 2.12: Rotate the probe 2 in the XZ plane by 90° so that the probe 2 is located at the center line of the virtual square along the X axis. Figure 4 and Figure 5 shown.

[0051] In this way, because the upper end surface of the forging 1 is a plane, the probe 2 can be easily adjusted to be absolutely perpendicular to the upper end surface of the forging 1, and then rotated 90°, so that the probe 2 can be absolutely perpendicular to the outer circumferential surface of the forging 1 when the center line of the above-mentioned virtual square is along the X-axis.

[0052] Step 2.2: Move the probe 2 along the Y axis until the probe 2 moves to point A. The coordinates of point A are obtained through system readings as (a, b). Point A is located outside the center line of the virtual square along the X axis. It is easy to understand that the above b value is the distance that the probe 2 moves along the Y axis in this step. Figure 6 shown.

[0053] Step 2.3: Rotate the probe 2 in the XY plane with a rotation angle of β, where tanβ=b / a, so that the probe 2 is perpendicular to the outer circumference of the forging 1 at point A. It is easy to understand that after the above step 2.2, although the position of the probe 2 is moved to point A, the direction of the probe 2 is still along the X-axis. At this time, the probe 2 is not perpendicular to the outer circumference of the forging 1, so after step 2.3, the direction of the probe 2 at point A is adjusted so that the probe 2 is perpendicular to the outer circumference of the forging 1, so that the sound beam emitted by the probe 2 is perpendicular to the outer circumference of the forging 1. Specifically, Figure 7 shown.

[0054] Optionally, the above step 4 includes:

[0055] Step 4.1: Move the probe 2 along the negative direction of the Z axis until the probe 2 detects the lower end surface of the forging 1;

[0056] Step 4.2: Move the probe 2 along the positive direction of the Z axis until the probe 2 detects the upper end surface of the forging 1, completing the detection.

[0057] In this way, the entire forging 1 can be ultrasonically inspected.

[0058] A best implementation of this embodiment is as follows: In the above step 2.2, the X coordinate of point A to which the probe 2 moves is equal to the Y coordinate, that is, a=b. In this way, the probe 2 is located on the diagonal of the above virtual square (the double-dotted line in the figure). In this case, the angle between the line connecting the probe 2 and the coordinate origin and the X axis is 450°. Therefore, the distance that the probe 2 can move reaches the maximum. Specifically, according to geometric knowledge, the ideal distance that the probe 2 can move in this case is Subtracting the water distance L on both sides, the theoretical maximum diameter of the forging 1 that can be measured in this case is D = P - 2L = 2545.2 - 2 × 150 = 2245.2 mm. However, because the maximum travel of the probe 2 in both the X and Y axes is 1800 mm (i.e., the side length of the aforementioned virtual square is 1800 mm), and the diameter of the forging 1 cannot be greater than the maximum travel of the probe 2 in both the X and Y axes, the maximum diameter of the actual forging 1 that can be measured by this method is D∈(0, 1800), where D represents length in mm. Thus, the optimal embodiment of this method can measure a maximum diameter of the actual forging 1 that is greater than that of existing inspection methods.

[0059] Optionally, when the probe 2 is located on the diagonal of the virtual square, in step 3, the method for adjusting the probe 2 is to move the probe 2 synchronously and at the same speed along the X-axis and the Y-axis, as follows: Figure 8As shown. If probe 2 is in other positions, the actual maximum diameter D∈(0,1800) of forging 1 can also be measured. However, the X and Y coordinates of these positions are not equal. Therefore, when moving probe 2 in step 3, it can only move synchronously and differentially along the X and Y axes. Obviously, by placing probe 2 on the diagonal of the above-mentioned virtual square, the position of probe 2 in step 3 can be adjusted better, more conveniently, and more accurately, so that the ultrasonic wave emitted by probe 2 is focused on the outer circumference of forging 1.

[0060] In the preferred embodiment, the probe 2 is offset by 45° relative to the center axis of the virtual square along the X direction. Alternatively, the probe 2 can be offset by 30°, 20°, 50°, or other angles relative to the center axis of the virtual square along the X direction, as long as the offset angle of the probe 2 relative to the center axis of the virtual square along the X direction is greater than 0° and less than 90°.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for inspecting forgings using ultrasonic C-scanning, characterized in that: include: Step 1: placing the forging (1) at a detection position of an ultrasonic C-scan detection system so that the center of the forging (1) coincides with the coordinate origin of the system; Step 2: moving the probe (2) so that the probe (2) deviates from the center line of the virtual square and is perpendicular to the outer circumferential surface of the forging (1), wherein the virtual square is a figure formed by combining the travel boundary line of the probe (2) moving along the X axis and the travel boundary line of the probe (2) moving along the Y axis; Step 3: adjusting the distance between the probe (2) and the outer circumference of the forging (1), and driving the probe (2) to emit ultrasonic waves, so that the sound beam emitted by the probe (2) is focused on the outer circumference of the forging (1); Step 4: Move the probe (2) along the Z axis until the probe (2) has scanned the forging (1) to complete the inspection.

2. The method for detecting forgings using ultrasonic C-scanning according to claim 1, characterized in that: In step 2, the probe (2) is moved as follows: Step 2.1: Position the probe (2) at the center line of the virtual square along the X-axis; Step 2.2: Move the probe (2) along the Y axis until the probe (2) moves to point A, and obtain the coordinates of point A as (a, b) through system readings; Step 2.3: Rotate the probe (2) in the XY plane at an angle of β, wherein tanβ=b / a, so that the probe (2) is perpendicular to the outer circumferential surface of the forging (1) at point A.

3. The method for inspecting forgings using ultrasonic C-scanning according to claim 2, wherein: The step 2.1 includes: Step 2.11: placing the probe (2) above the forging (1), and adjusting the probe (2) so that the probe (2) is perpendicular to the upper end surface of the forging (1); Step 2.12: Rotate the probe (2) in the XZ plane at an angle of 90° so that the probe (2) is located at the center line of the virtual square along the X axis.

4. The method for inspecting forgings using ultrasonic C-scanning according to claim 2, wherein: In step 2.2, the X coordinate of point A to which the probe (2) moves is equal to the Y coordinate.

5. The method for inspecting forgings using ultrasonic C-scanning according to claim 4, wherein: In step 3, the method for adjusting the probe (2) is: The probe (2) is moved synchronously and at the same speed along the X-axis and the Y-axis.

6. The method for inspecting forgings using ultrasonic C-scanning according to any one of claims 1 to 5, characterized in that: The step 4 comprises: Step 4.1: moving the probe (2) along the negative direction of the Z axis until the probe (2) detects the lower end surface of the forging (1); Step 4.2: Move the probe (2) along the positive direction of the Z axis until the probe (2) detects the upper end surface of the forging (1), thereby completing the detection.

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