An ultrasonic shot blasting method for reducing the seam waviness of riveted wall panels

Abstract

The application provides an ultrasonic shot blasting method for reducing the corrugation of a riveted wall plate butt joint, in which the corrugation is measured, the overproof area is determined, the side wall plate edge with a higher amplitude than the theoretical profile surface at the riveted wall plate butt joint is protected, the area of the ultrasonic shot blasting area is determined, the ultrasonic shot blasting is performed by using the determined ultrasonic shot blasting parameters, the corrugation of the area after the ultrasonic shot blasting is measured again, and it is determined whether the riveted wall plate plane requirement is met; and the corrugation of the riveted wall plate butt joint can be quickly and efficiently reduced by the method, and the purposes of accurate processing time control and accurate wall plate profile control are achieved.

Description

Technical Field

[0001] This invention belongs to the field of ultrasonic shot peening technology, and particularly relates to an ultrasonic shot peening method for reducing the waviness of the seam of riveted wall panels. Background Technology

[0002] The basic principle of ultrasonic shot peening is to use a transducer to convert high-frequency ultrasonic waves into mechanical vibration waves, which drive the impact pin to apply high-energy-density shock waves to the surface of the workpiece. This causes the surface material to undergo severe plastic deformation, refines the microstructure of the material, and generates high-amplitude residual compressive stress, thereby causing the workpiece to undergo spherical deformation on the side towards which the ultrasonic shot is peened.

[0003] For riveted wall panels, waviness deviation is often caused at the joint edge of two wall panels, that is, the joint of the wall panels is deformed due to riveting, resulting in unexpected undulations on the surface of the wall panel that exceed the specified requirements. Summary of the Invention

[0004] To address the problem of excessive waviness at the joint edge of two separate wall panels in existing technologies, this application provides an ultrasonic shot peening method for reducing the waviness of the joint between riveted wall panels. The technical solution is as follows: An ultrasonic shot peening method for reducing the waviness of riveted panel seams involves measuring the waviness and identifying areas exceeding tolerance. The edge of the panel where the waviness amplitude at the seam exceeds the theoretical surface shape is protected. The area of ​​the ultrasonic shot peening region is determined, and ultrasonic shot peening is performed using predetermined parameters. The waviness of the peened area is then remeasured to determine if it meets the planarity requirements of the riveted panel. This method allows for precise control of the panel shape without the need for disassembling and reshaping the original rivets as in traditional methods, and is not limited by space constraints.

[0005] Optionally, the method specifically includes: Step 1: Use a ruler to measure and calculate the waviness at the joint of the riveted wall panels, and mark the areas where the waviness exceeds the tolerance. Step 2: Mark and protect the areas with excessive waviness; Step 3: Determine the ultrasonic shot peening area and mark the ultrasonic shot peening area. Step 4: Determine the ultrasonic shot peening parameters and perform the shot peening operation according to the ultrasonic shot peening parameters. During the shot peening operation, the ultrasonic gun body is perpendicular to the wall panel and moves slowly in a bouncing motion. Pulling is not allowed. The ultrasonic shot peening parameters include the firing pin diameter, ultrasonic amplitude, and shot peening time. Step 5: Remeasure the waviness of the area after ultrasonic shot peening. If... Then the process ends; The maximum depth of the ripples. The wavelength of the ripple. This represents the upper limit of the waviness.

[0006] Optionally, step 1 includes: A preliminary assessment of the joint of the riveted wall panels is conducted to determine the measurement length. A ruler slightly larger than the measurement length is selected for measurement, ensuring that the ruler length does not exceed 110% of the measurement length. According to the relation Calculate the waviness, where For waviness, The maximum depth of the ripples. The wavelength of the ripple is approximated by the length of a knife-edge ruler; using the length of the knife-edge ruler to approximate the wavelength can characterize the distance between the two farthest points of the ripple.

[0007] Along the measurement area, in a direction perpendicular to the flight direction of the riveted panel, measurements are taken at fixed intervals, and the marks are marked. The area marked as out of tolerance is considered the area where the joints of the riveted panels meet. It should not exceed the upper limit of waviness. ,Right now It should not exceed .

[0008] Optionally, step 2 includes: For the areas exceeding tolerance, observe the panel plane along a direction perpendicular to the riveted panel's flight direction. Draw a line on the panel where the waviness at the joint is higher than the theoretical outer surface, using the panel edge as the boundary of the area exceeding tolerance. Mark all areas exceeding waviness tolerance, and record the length of each area as... Shot blasting tape was used to blast the wall panel inwards from the edge with a width of [missing value]. The out-of-tolerance areas are protected to obtain the protected area. The width of the protected area should not exceed this threshold to ensure that the ultrasonic shot peening area is wide enough for the shot peening operation.

[0009] Optionally, step 3 includes: Along the boundary of the protected area and following the flight direction of the riveted wall panel, the side of the wall panel with a wave amplitude higher than the theoretical outer surface is identified as the ultrasonic shot peening area; Calculate the shot peening area size based on the size of the rivet-affected zone: For riveted areas, the width of the ultrasonic shot peening area is... ,in This represents the protection width corresponding to the ultrasonic shot peening area. The diameter of the rivet is the length of the ultrasonic shot peening area. Measurements determined that one end of the ultrasonic shot-peening area is flush with the protected area, and the other end is at the edge of the rivet. Therefore, the area of ​​the ultrasonic shot-peening area corresponding to the riveted area is... For unriveted areas, the width of the ultrasonic shot peening area is: ,in The protective width corresponding to the ultrasonic shot peening area is denoted as , and the length of the ultrasonic shot peening area is denoted as . ,but Then, the area of ​​the ultrasonic shot peening region corresponding to the unriveted area. The entire area of ​​ultrasonic shot peening The ultrasonic shot peening area is then marked with lines.

[0010] Optionally, step 4 includes: For the wall thickness of the area to be shot peened 10mm, striker diameter selected as φ2mm, ultrasonic amplitude selected as 70%; For the wall thickness of the area to be shot peened 10mm, striker diameter selected as φ3mm, ultrasonic amplitude selected as 80%; according to Calculate the shot peening time T, where the unit of shot peening time T is seconds. Where is the area of ​​the ultrasonic shot peening region, and W is the effective impact area per unit time.

[0011] Furthermore, the method also includes: If not satisfied If so, repeat steps 2 through 5 until the condition is met.

[0012] Optionally, measurements are taken every 5 mm along the measurement area, in a direction perpendicular to the heading of the riveted panel, and the measurements are marked. The 5mm measurement distance ensures a sufficient measurement area to more completely reflect the waviness of the riveted panel joints.

[0013] The beneficial effects of this invention are as follows: (1) An ultrasonic shot peening method for rapidly reducing the waviness of the seam of riveted wall panels is proposed. The out-of-tolerance area is determined by measuring the waviness, and the edge of the wall panel with higher waviness at the seam of the riveted wall panel is protected. The area of ​​the ultrasonic shot peening area is determined by theoretical calculation, and appropriate parameters are selected for ultrasonic shot peening to ensure assembly requirements.

[0014] (2) By using the method described in this invention, the ripples at the joint of the riveted wall panel can be reduced quickly and efficiently without disassembling the original rivets, and the purpose of precise control of processing time and wall panel shape can be achieved. Attached Figure Description

[0015] Figure 1 A schematic diagram of an ultrasonic shot peening method for reducing the waviness of the seams in riveted panels. In the diagram: 1-Boundary of the area with excessive waviness at the joint of the riveted wall panel; 2-Ultrasonic shot peening protection area; 3-Rivet; 4-Ultrasonic shot peening area corresponding to the riveted area; 5-Ultrasonic shot peening area corresponding to the unriveted area; 6-Wall panel with lower amplitude deviation; 7-Wall panel with higher amplitude deviation; 8-Riveted stringer. Detailed Implementation

[0016] This invention provides an ultrasonic shot peening method for reducing the waviness of the seam of riveted panels. By performing ultrasonic shot peening on the seam of the panels, the waviness is reduced to meet the requirements of subsequent assembly. This method eliminates the need to disassemble the original rivets of the riveted panels and then reshape them as in traditional methods, and features fast and precise control.

[0017] Taking a riveted wall panel as an example, see Figure 1 The wall panel is formed by riveting two separate wall panels 6 and 7 together with a long girder 8. The overall wall panel is 16m long and 3.5m wide. The surface of the riveted wall panel has excessive waviness at the joint.

[0018] Step 1: Conduct a preliminary assessment of the joint between the riveted panels, determining the measurement length to be approximately 68.5~72.5mm. Following the rule that the length of the ruler should not exceed 110% of the measurement length, select a 75mm ruler for measurement. Then, according to the formula... Calculations are performed to determine the wavelength. Approximately 75mm. To ensure a smooth surface at the joint of the riveted wall panels, The waviness should not exceed the upper limit of 0.003. See also Figure 1 At the joint between the surfaces of wall panel 6 (where the wave amplitude is lower than the theoretical outer surface) and wall panel 7 (where the wave amplitude is higher than the theoretical outer surface), measurements are taken every 5 mm in the u-direction perpendicular to the heading of the riveted wall panels, and the measurement data are recorded. ,Right now The area is considered to be out of waviness tolerance. The measurement locations are statistically analyzed according to the distance from the measurement point to the edge of the flange root of the wall panel, from smallest to largest, as shown in Table 1.

[0019] Table 1. Measurement data of waviness at the joint of riveted wall panels (unit: mm)

[0020] Note: Measurement before ultrasonic shot peening Based on the measurement data, the area 10mm to 110mm from the edge of the wall panel root is the area with excessive waviness, and it is marked on the surface of the wall panel.

[0021] Step 2, as follows Figure 1As shown, the plane of the boundary 1 of the corrugation deviation area at the joint of the riveted wall panels is observed along the u direction. The edge of the wall panel 7 with a corrugation amplitude higher than the theoretical outer surface is regarded as the boundary of the deviation area. A line is drawn in the area 10mm~110mm away from the edge of the wall panel root, with a length of... This refers to the length of the area where the waviness exceeds the tolerance. Shot-peening tape is used, and the selected protective width... The out-of-tolerance area is protected, and the protected area is 2.

[0022] Step 3: Along the boundary of protected area 2 and following the flight direction of the riveted wall panel, define the side of wall panel 7 with an amplitude higher than the theoretical outer surface as the ultrasonic shot peening area. Measure the diameter of the rivet 3, i.e., the rivet influence area. For the riveted area, the width of the ultrasonic shot peening area is... The width of the ultrasonic shot peening area 4 corresponding to the riveted area is determined to be 65mm. One end of the length of the ultrasonic shot peening area is flush with the protected area, and the other end is the edge of the rivet; this is determined by measurement. The width is 60mm. For unriveted areas, the width of the ultrasonic shot peening area is... The width of the ultrasonic shot peening area 5 corresponding to the unriveted area is determined to be 45mm, with one end of its length flush with the protected area and the other end at the edge of the rivet. Calculations show that the ultrasonic shot peening area... 5700mm 2 Draw lines on areas 4 and 5.

[0023] Step 4: In this example, the thickness of the riveted panel in the shot-peening area is 12mm, therefore, the diameter of the impact pin is selected as φ3mm, and the ultrasonic amplitude is selected as 80%. Regarding the shot-peening time... The CPT101 ultrasonic shot peening equipment is used, and the effective impact area of ​​the shot peening gun per unit time is 800mm. 2 / s, therefore Calculation yields Take 7.2s. During the ultrasonic shot peening process, it is necessary to ensure that the gun body is perpendicular to the wall panel and moves slowly in a bouncing motion, hitting the ultrasonic shot peening area of ​​the riveted wall panel for 7.2s before stopping.

[0024] Step 5: Using the area with excessive waviness as the basis for measurement, remeasure the waviness of the area after ultrasonic shot peening. The data is shown in Table 2.

[0025] Table 2. Measurement data of waviness at the joint of riveted wall panels (unit: mm)

[0026] Note: Measurement was taken after one ultrasonic shot peening session. Data analysis revealed that after one ultrasonic shot peening, the area 65mm~80mm from the edge of the panel root was the area with excessive waviness. Steps 2 to 5 were repeated to protect this area, with the protection width set at [value missing]. Ultrasonic shot peening area mm 2 Calculated The time was 1.3s. After ultrasonic shot peening, the waviness of the out-of-tolerance area was measured again, as shown in Table 3.

[0027] Table 3. Measurement data of waviness at the joint of riveted wall panels (unit: mm)

[0028] Note: Measurement after secondary ultrasonic shot peening. Through measurement and statistical analysis, the area of ​​excessive waviness at the joint of the riveted panel has met the requirements. ,Right now Subsequent assembly can then proceed.

[0029] In actual engineering production, the ultrasonic shot peening method for reducing the waviness of riveted panel seams proposed in this invention can determine the out-of-tolerance area of ​​the seam through waviness measurement, perform marking protection, and then calculate the size of the ultrasonic shot peening area based on the size of the rivet-affected area and the protection width. The ultrasonic shot peening area is then marked to define the area, and the shot peening time is calculated based on the equipment capacity. The out-of-tolerance area is then ultrasonically shot peened. The significant advantage of this invention is that the processing time and panel shape can be precisely controlled during the ultrasonic shot peening process. It eliminates the need for disassembling the original rivets of the riveted panel and reshaping them as in traditional methods, is not limited by space, and can be processed on the smooth outer surface of the panel, thus meeting subsequent assembly requirements.

[0030] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. An ultrasonic shot peening method for reducing the waviness of the seam in riveted wall panels, characterized in that, Measure the waviness and identify the out-of-tolerance area. Protect the edge of the wall panel on the side where the waviness at the joint of the riveted wall panel is higher than the theoretical outer surface. Determine the area of ​​the ultrasonic shot peening zone and perform ultrasonic shot peening using the determined ultrasonic shot peening parameters. Remeasure the waviness of the area after ultrasonic shot peening to determine whether it meets the requirements of the riveted wall panel plane. The method specifically includes: Step 1: Use a ruler to measure and calculate the waviness at the joint of the riveted panels, and mark the areas where the waviness exceeds the tolerance: A preliminary assessment of the joint of the riveted wall panels is conducted to determine the measurement length. A ruler slightly larger than the measurement length is selected for measurement, ensuring that the ruler length does not exceed 110% of the measurement length. According to the relation Calculate the waviness, where Where is the waviness, D is the maximum depth of the waviness, L is the wavelength of the waviness, and the length of the knife-edge ruler is taken as the value. Along the measurement area, in a direction perpendicular to the flight direction of the riveted panel, measurements are taken at fixed intervals, and the marks are marked. The area marked as out of tolerance is considered the area where the joints of the riveted panels meet. It should not exceed the upper limit of waviness. That is, D should not exceed ; Step 2: Mark and protect the areas with excessive waviness: For the out-of-tolerance areas, observe the panel plane along a direction perpendicular to the riveted panel's flight direction. Mark a line on the panel where the corrugation amplitude at the joint is higher than the theoretical outer surface, using the panel edge as the boundary of the out-of-tolerance area. Mark all areas with out-of-tolerance corrugations, and denote the length of each out-of-tolerance area as X. Use shot-peening tape to protect the out-of-tolerance area with a width of Y extending inwards from the panel edge, thus obtaining the protected area. ; Step 3: Determine the ultrasonic shot peening area and mark the ultrasonic shot peening area: Along the boundary of the protected area and following the flight direction of the riveted wall panel, the side of the wall panel with a wave amplitude higher than the theoretical outer surface is identified as the ultrasonic shot peening area; Calculate the shot peening area size based on the size of the rivet-affected zone: For riveted areas, the width of the ultrasonic shot peening area is... Where Y1 is the protective width corresponding to the ultrasonic shot peening area, Z is the rivet diameter, and the length M of the ultrasonic shot peening area is determined by measurement. One end of the ultrasonic shot peening area is flush with the protective area, and the other end is the rivet edge. Therefore, the area of ​​the ultrasonic shot peening area corresponding to the riveted area is... For the unriveted area, the width of the ultrasonic shot peening area is 3Y2, where Y2 is the corresponding protective width of the ultrasonic shot peening area, and the length of the ultrasonic shot peening area is denoted as N. Then, the area of ​​the ultrasonic shot peening region corresponding to the unriveted area. The entire area of ​​ultrasonic shot peening The ultrasonic shot peening area is then marked with lines. Step 4: Determine the ultrasonic shot peening parameters and perform the shot peening operation according to the ultrasonic shot peening parameters. During the shot peening operation, the ultrasonic gun body is perpendicular to the wall panel and moves slowly in a bouncing motion. Pulling is not allowed. The ultrasonic shot peening parameters include the firing pin diameter, ultrasonic amplitude, and shot peening time. Step 5: Remeasure the waviness of the area after ultrasonic shot peening. If... The process ends when D is reached; D is the maximum depth of the ripples, and L is the wavelength of the ripples. This represents the upper limit of the waviness.

2. The method according to claim 1, characterized in that, Step 4 includes: For the wall thickness of the area to be shot peened Selection of firing pin diameter The ultrasonic amplitude is selected as 70%. For the wall thickness of the area to be shot peened Selection of firing pin diameter The ultrasonic amplitude is selected as 80%. according to Calculate the shot peening time T, where the unit of shot peening time T is seconds, and S is the area of ​​the ultrasonic shot peening region, and W is the effective impact area per unit time.

3. The method according to claim 1, characterized in that, The method further includes: If not satisfied If so, repeat steps 2 through 5 until the condition is met.

4. The method according to claim 1, characterized in that, Along the measurement area, in a direction perpendicular to the flight direction of the riveted panel, measurements are taken every 5 mm, and the marks are made. The area.

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