An ultrasonic nondestructive testing device for residual stress of automobile stamping parts

Abstract

The present application relates to the technical field of automobile stamping parts, in particular to a kind of automobile stamping parts residual stress ultrasonic nondestructive testing device. Including multiple probes and multiple adjusting devices, the bottom of multiple probes is fixedly connected with connecting line, multiple adjusting devices are respectively arranged outside multiple probes, adjusting device includes silica gel block, silica gel block is sleeved outside probe, silica gel block is fixedly installed with sleeve in the inside, probe is embedded in the inside of sleeve, the inside of sleeve is threadedly connected with limit ring, probe bottom and the inside of sleeve are fixedly connected with spring, probe elastic adjusting structure is formed by sleeve, spring and limit ring, spring provides constant adhesion pressure for probe, limit ring is used to adjust telescopic stroke, the sliding fit between limit block and limit slot prevents probe from circumferential deflection, probe elastic adjusting structure can guarantee the stability of ultrasonic detection pressure and angle, to improve the detection accuracy of residual stress.

Description

Technical Field

[0001] This invention relates to the field of automotive stamping technology, and more specifically, to an ultrasonic non-destructive testing device for residual stress in automotive stampings. Background Technology

[0002] Automotive stamping parts are core basic components in automobile manufacturing. They refer to automotive parts of specific shapes and sizes made by applying pressure to metal sheets (mainly steel and aluminum sheets) through stamping dies and presses to plastically deform or separate them. They are the starting point of the four major processes of the whole vehicle (stamping → welding → painting → final assembly) and account for more than 70% of the steel used in the whole vehicle.

[0003] According to existing technology, automotive stamping parts, as core components for the load-bearing and protection of the vehicle body, are prone to residual stress during the forming process. Under the vibration and alternating load of vehicle operation, residual stress can cause workpiece deformation, warping, fatigue cracking, and dimensional deviations, resulting in a decrease in the assembly accuracy of the vehicle body. Therefore, it is necessary to use an ultrasonic flaw detector to inspect automotive stamping parts during production. However, since traditional ultrasonic flaw detector probes are difficult to fit perpendicularly to the workpiece surface, it can lead to distortion of the residual stress detection signal. Summary of the Invention

[0004] This invention provides an ultrasonic non-destructive testing device for residual stress in automotive stamping parts. The device comprises a sleeve, a spring, and a limiting ring to form an elastic adjustment structure for the probe. The spring provides a constant contact pressure to the probe, the limiting ring adjusts the extension and retraction stroke, and the sliding fit between the limiting block and the limiting groove prevents circumferential deflection of the probe. This elastic adjustment structure ensures the stability of the ultrasonic testing pressure and angle, thereby improving the accuracy of residual stress detection. This solves the problem mentioned in the background art: the difficulty of perpendicularly contacting the traditional ultrasonic flaw detection probe with the workpiece surface leads to distortion of the residual stress detection signal.

[0005] To achieve the above objectives, an ultrasonic non-destructive testing device for residual stress in automotive stamping parts includes multiple probes and multiple adjustment devices. Connecting wires are fixedly connected to the bottom of each probe. The adjustment devices are respectively disposed outside the probes. Each adjustment device includes a silicone block, which is fitted over the probe. A sleeve is fixedly installed inside the silicone block, and the probe is embedded inside the sleeve. A limit ring is threaded into the sleeve, and a spring is fixedly connected to the bottom of the probe and the inside of the sleeve. A fixing device is provided directly below the multiple probes. The fixing device includes a fixing plate located directly below the probes. A fixing frame is fixedly installed on the top of the fixing plate. A skeleton is snapped into the inside of the multiple silicone blocks. Multiple locking blocks are fixedly connected to the top of the skeleton. The locking blocks are embedded inside the fixing frame. The top of the fixing plate is provided with an auxiliary device, which includes an airbag that is bonded to the top of the fixing plate. The airbag is located directly below a plurality of silicone blocks. An air inlet pipe and an air outlet pipe are fixedly connected to the side wall of the airbag. A one-way valve is fixedly installed on the outside of both the air inlet pipe and the air outlet pipe.

[0006] In the above technical solution, the sleeve has multiple limiting grooves inside, the probe is fixedly connected to a limiting block near the limiting groove, the limiting block slides in a sliding fit with the limiting groove, the silicone block has a slot inside, the skeleton is embedded in the slot, and the bottom of the sleeve has a wire hole.

[0007] Secondly, a connecting plate is fixedly connected to the bottom of the fixed plate, and a connector is fixedly connected to the end of the connecting plate away from the fixed plate. The connector is used to adapt and connect with an external robotic arm. A soft pad is fixedly connected to the ends of the fixed frame and the fixed plate that are close to each other. The frame is a nylon fiberglass frame. Multiple through holes are opened inside the soft pad and the fixed plate. A ribbon cable plate is fixedly connected to the bottom of the fixed plate.

[0008] Furthermore, based on the above, a support block is fixedly connected to the side wall of the fixing plate, a main block is fixedly connected to the top of the support block, the main block is sleeved on the outside of the air inlet pipe and the air outlet pipe, a secondary block is fixedly connected to the top of the main block, rubber pads are provided inside the secondary block and the main block, multiple through holes are opened inside the airbag, and a wear-resistant silicone rubber coating is provided on the outside of the airbag.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: In this ultrasonic non-destructive testing device for residual stress in automotive stamping parts, a probe elastic adjustment structure is formed by a sleeve, a spring, and a limiting ring. The spring provides a constant contact pressure for the probe, the limiting ring is used to adjust the extension stroke, and the sliding fit between the limiting block and the limiting groove prevents the probe from circumferentially deflecting. The probe elastic adjustment structure can ensure the stability of ultrasonic testing pressure and angle, thereby improving the detection accuracy of residual stress. A silicone block is embedded with a skeleton, which can flexibly deform to adapt to the complex curved surface of automotive stamping parts. The skeleton constrains the probe array to maintain a regular arrangement. An airbag and a one-way valve control the inflation and deflation, assisting the silicone block in actively adapting to the curvature of the workpiece. The skeleton is snapped into the fixing frame by a locking block, and with the detachable limiting ring, it is convenient for component disassembly and maintenance. The fixing plate is adapted to the robotic arm through a connecting plate and a connecting head. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the silicone block in this invention. Figure 3This is an enlarged structural diagram of point A in this invention; Figure 4 This is a top view of the fixing plate in this invention. Figure 5 This is an enlarged structural diagram of point B in the present invention; Figure 6 This is a cross-sectional view of the connecting plate and the connector in this invention. Figure 7 This is a side view of the fixing plate in this invention. Figure 8 This is a three-dimensional structural diagram of the airbag in this invention; Figure 9 This is an enlarged structural diagram of point C in this invention.

[0011] The meanings of the labels in the diagram are as follows: 1. Probe; 2. Connecting wire; 3. Adjustment device; 31. Silicone block; 32. Sleeve; 33. Limiting ring; 34. Spring; 35. Limiting groove; 36. Limiting block; 37. Push block; 38. Slot; 39. Wire hole; 4. Fixing device; 41. Fixing plate; 42. Fixing frame; 43. Frame; 44. Slot; 45. Connecting plate; 46. Connector; 47. Soft pad; 48. Through hole; 49. Cable tray; 5. Auxiliary device; 51. Airbag; 52. Inlet pipe; 53. Outlet pipe; 54. One-way valve; 55. Support block; 56. Main block; 57. Sub-block. Detailed Implementation

[0012] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0013] Because traditional ultrasonic testing probes are difficult to fit perpendicularly to the workpiece surface, residual stress detection signals can be distorted.

[0014] Therefore, in view of the above-mentioned problems, the present invention provides an ultrasonic non-destructive testing device for residual stress in automotive stamping parts, with reference to... Figure 1 - Figure 3As shown, the device includes multiple probes 1 and multiple adjustment devices 3. Each probe 1 has a connecting wire 2 fixedly connected to its bottom, allowing for simultaneous detection of a large area of ​​the workpiece, thus improving detection efficiency. Multiple adjustment devices 3 are respectively installed outside the probes 1. Each adjustment device 3 includes a silicone block 31, which is fitted around the probe 1. The silicone block 31 has flexible deformation properties, enabling it to adapt the probe 1 to the irregular curved surface of the stamped part, ensuring a tight fit. A sleeve 32 is fixedly installed inside the silicone block 31, and the probe 1 is embedded inside the sleeve 32. The sleeve 32 provides guidance and protection for the probe 1, preventing radial wobbling. A limit ring 33 is threaded inside the sleeve 32, allowing for flexible adjustment of the probe 1's extension / retraction limit position and preventing excessive extension and damage. A spring 34 is fixedly connected to the bottom of the probe 1 and inside the sleeve 32, providing a constant fitting pressure for the probe 1.

[0015] refer to Figure 2 and Figure 3 As shown, the sleeve 32 has multiple limiting grooves 35 inside. A limiting block 36 is fixedly connected to the outside of the probe 1 near the limiting groove 35. The limiting block 36 slides with the inside of the limiting groove 35. The sliding of the limiting groove 35 and the limiting block 36 limits the probe 1 to prevent circumferential rotation during extension and retraction. Two push blocks 37 are fixedly connected to the top of the limiting ring 33. When the probe 1 enters the sleeve 32, the push blocks 37 are pushed to make the limiting ring 33 rotate, so that the limiting ring 33 rotates into the sleeve 32 to block the position of the probe 1. The push blocks 37 facilitate the quick screwing of the limiting ring 33. The silicone block 31 has a slot 38 inside. The skeleton 43 is embedded in the slot 38. The bottom of the sleeve 32 has a wire hole 39 to facilitate the wiring of the probe 1 connecting wire 2 and avoid the cable being squeezed and pulled.

[0016] refer to Figure 4 - Figure 6 As shown, a fixing device 4 is provided directly below the multiple probes 1. The fixing device 4 includes a fixing plate 41 located directly below the probes 1. A fixing frame 42 is fixedly installed on the top of the fixing plate 41. A skeleton 43 is snapped into the inside of the multiple silicone blocks 31. The skeleton 43 can constrain the excessive deformation of the silicone blocks 31 and maintain the regular matrix arrangement of the multiple probes 1. A multiple locking blocks 44 are fixedly connected to the top of the skeleton 43. The locking blocks 44 are embedded in the inside of the fixing frame 42 to realize the snap-fit ​​assembly of the skeleton 43 and the fixing frame 42, while preventing the skeleton 43 from shifting relative to the fixing frame 42 and improving the stability of the overall structure.

[0017] Refer again Figure 4 - Figure 6As shown, a connecting plate 45 is fixedly connected to the bottom of the fixed plate 41. A connector 46 is fixedly connected to the end of the connecting plate 45 away from the fixed plate 41. The connector 46 is used to adapt and connect with an external robotic arm. A soft pad 47 is fixedly connected to the ends of the fixed frame 42 and the fixed plate 41 that are close to each other. This effectively buffers the vibration generated by the mechanical operation and prevents the vibration from being transmitted to the probe 1 and affecting the detection accuracy. The frame 43 is a nylon fiberglass frame. The frame 43 is made of nylon fiberglass material, which can stably support the overall structure without restricting the deformation of the flexible substrate. Multiple through holes 48 are opened inside the soft pad 47 and the fixed plate 41. A cable tray 49 is fixedly connected to the bottom of the fixed plate 41. With the cable tray 49 fixed at the bottom, the connecting wires 2 can be arranged in an orderly manner to avoid the cables from getting tangled and messy.

[0018] refer to Figure 7 - Figure 9 As shown, the top of the fixing plate 41 is provided with an auxiliary device 5. The auxiliary device 5 includes an airbag 51 that is bonded to the top of the fixing plate 41. The airbag 51 is located directly below multiple silicone blocks 31. By inflating and deflating the airbag 51, it can push the silicone blocks 31 upwards, actively adapting to the shape of the automotive stamping part and actively fitting the automotive stamping part. The side wall of the airbag 51 is fixedly connected with an air inlet pipe 52 and an air outlet pipe 53 to achieve stable air pressure control. One-way valves 54 are fixedly installed on the outside of both the air inlet pipe 52 and the air outlet pipe 53.

[0019] refer to Figure 8 and Figure 9 As shown, a support block 55 is fixedly connected to the side wall of the fixing plate 41 to provide stable installation support for the pipe clamping structure. A main block 56 is fixedly connected to the top of the support block 55. The main block 56 is fitted over the air inlet pipe 52 and the air outlet pipe 53 to initially limit the air pipe and prevent it from shaking or shifting. A secondary block 57 is fixedly connected to the top of the main block 56. Both the secondary block 57 and the main block 56 are equipped with rubber pads inside to flexibly hold the air pipe and prevent it from leaking due to wear on the pipe wall. They also serve to reduce vibration and noise. The airbag 51 has multiple through holes inside to facilitate the smooth passage of the probe 1 connection wire 2. The airbag 51 is coated with a wear-resistant silicone rubber coating on the outside.

[0020] Working principle of the invention: During operation, the device is connected to an external robotic arm via connector 46. The robotic arm moves the entire detection device above the stamping part to be tested, so that multiple probes 1 are facing the detection area. The soft pad 47 on the bottom fixing plate 41 can buffer the vibration generated by the operation of the robotic arm and prevent it from being transmitted to the probes 1 and affecting the accuracy.

[0021] When the device presses down to make the probe 1 contact the irregular curved surface of the stamping part, the silicone block 31 outside each probe 1 uses its own flexible deformation characteristics to drive the probe 1 to adapt to the concave and convex shape of the workpiece. At the same time, the airbag 51 of the auxiliary device 5 is inflated through the air inlet pipe 52, expands upward and pushes the multiple silicone blocks 31 above, actively compensating for the surface drop and ensuring that the probe 1 is in close contact with the workpiece surface. Each probe 1 is independently acted upon by the spring 34 to provide a constant contact pressure, and the limiting ring 33 inside the sleeve 32 restricts the position of the probe 1 inside the sleeve 32.

[0022] When the probe 1 extends or retracts within the sleeve 32, the sleeve 32 provides radial protection. The limiting block 36 on the probe 1 slides into the limiting groove 35 within the sleeve 32 to prevent the probe 1 from rotating circumferentially. When the silicone block 31 deforms, it also causes the skeleton 43 to bend to a certain extent.

[0023] All connecting wires 2 fixed at the bottom of probe 1 are routed in an orderly manner through the wire hole 39 at the bottom of sleeve 32, the through hole of airbag 51, and the wiring plate 49 at the bottom of fixing plate 41. After probe 1 is tightly attached to the workpiece, it synchronously transmits and receives ultrasonic signals. Based on the principle of ultrasonic critical refraction longitudinal waves, the change in sound time difference or sound velocity is measured, and then the residual stress distribution on the surface of the stamped part and within a certain depth is calculated. After the test is completed, the robotic arm lifts the entire device, the airbag 51 deflates and contracts through the air outlet pipe 53, and the silicone block 31 and probe 1 return to their original positions by their own elasticity and the force of the spring 34.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultrasonic non-destructive testing device for residual stress in automotive stamping parts, comprising multiple probes (1) and multiple adjustment devices (3), wherein the bottom of each of the multiple probes (1) is fixedly connected to a connecting wire (2), characterized in that: Multiple adjustment devices (3) are respectively disposed outside multiple probes (1). Each adjustment device (3) includes a silicone block (31), which is sleeved on the outside of the probe (1). A sleeve (32) is fixedly installed inside the silicone block (31), and the probe (1) is embedded inside the sleeve (32). A limit ring (33) is threaded inside the sleeve (32), and a spring (34) is fixedly connected to the bottom of the probe (1) and the inside of the sleeve (32). A fixing device (4) is provided directly below the multiple probes (1). The fixing device (4) includes a fixing plate (41) located directly below the probes (1). A fixing frame (42) is fixedly installed on the top of the fixing plate (41). A skeleton (43) is snapped into the inside of the multiple silicone blocks (31). A multiple locking blocks (44) are fixedly connected to the top of the skeleton (43). The locking blocks (44) are embedded inside the fixing frame (42). The top of the fixing plate (41) is provided with an auxiliary device (5), which includes an airbag (51) bonded to the top of the fixing plate (41). The airbag (51) is located directly below a plurality of silicone blocks (31). An air inlet pipe (52) and an air outlet pipe (53) are fixedly connected to the side wall of the airbag (51). A one-way valve (54) is fixedly installed on the outside of both the air inlet pipe (52) and the air outlet pipe (53).

2. The ultrasonic non-destructive testing device for residual stress in automotive stamping parts according to claim 1, characterized in that: The sleeve (32) has multiple limiting grooves (35) inside. A limiting block (36) is fixedly connected to the outside of the probe (1) near the limiting groove (35). The limiting block (36) slides between the outside of the limiting groove (35) and the inside of the limiting groove (35).

3. The ultrasonic non-destructive testing device for residual stress in automotive stamping parts according to claim 1, characterized in that: The top of the limiting ring (33) is fixedly connected to two push blocks (37). When the probe (1) enters the sleeve (32), the push blocks (37) are pushed to make the limiting ring (33) rotate, so that the limiting ring (33) rotates into the sleeve (32) to block the position of the probe (1).

4. The ultrasonic non-destructive testing device for residual stress in automotive stamping parts according to claim 1, characterized in that: The silicone block (31) has a slot (38) inside, the skeleton (43) is embedded in the slot (38), and the bottom of the sleeve (32) has a wire hole (39).

5. The ultrasonic non-destructive testing device for residual stress in automotive stamping parts according to claim 1, characterized in that: A connecting plate (45) is fixedly connected to the bottom of the fixed plate (41), and a connector (46) is fixedly connected to the end of the connecting plate (45) away from the fixed plate (41). The connector (46) is used to adapt and connect with an external robotic arm.

6. The ultrasonic non-destructive testing device for residual stress in automotive stamping parts according to claim 1, characterized in that: The fixed frame (42) and the fixed plate (41) are fixedly connected to a soft pad (47) at one end close to each other, and the frame (43) is a nylon fiberglass frame.

7. The ultrasonic non-destructive testing device for residual stress in automotive stamping parts according to claim 6, characterized in that: The soft pad (47) and the fixing plate (41) are both provided with multiple through holes (48), and the bottom of the fixing plate (41) is fixedly connected with a ribbon cable plate (49).

8. The ultrasonic non-destructive testing device for residual stress in automotive stamping parts according to claim 1, characterized in that: The side wall of the fixed plate (41) is fixedly connected to a support block (55), and the top of the support block (55) is fixedly connected to a main block (56). The main block (56) is fitted over the outside of the air inlet pipe (52) and the air outlet pipe (53).

9. The ultrasonic non-destructive testing device for residual stress in automotive stamping parts according to claim 8, characterized in that: The main block (56) is fixedly connected to the top of the sub-block (57), and both the sub-block (57) and the main block (56) are provided with rubber pads inside.

10. The ultrasonic non-destructive testing device for residual stress in automotive stamping parts according to claim 1, characterized in that: The airbag (51) has multiple perforations inside, and the airbag (51) has a wear-resistant silicone rubber coating on the outside.

Images